Handle non-baseline supporting subclasses overriding baseline supporting classes

If a subclass (say a child of GtkButton) overrides the non-baseline
size request methods we need to call these, rather than the new
get_height_and_baseline_for_width method.

In order to handle this we make the default for this method to be
NULL, and instead check at runtime which method to call. If any
non-baseline vfunc has changed in a class but the baseline one
hasn't, then we can't use the baseline one.

docs/reference/gtk/gtk3-sections.txt

@@ -486,6 +486,8 @@ gtk_box_set_spacing
 gtk_box_reorder_child
 gtk_box_query_child_packing
 gtk_box_set_child_packing
+gtk_box_get_baseline_position
+gtk_box_set_baseline_position
 <SUBSECTION Standard>
 GTK_BOX
 GTK_IS_BOX
@@ -5159,6 +5161,7 @@ gtk_widget_remove_tick_callback
 gtk_widget_size_request
 gtk_widget_get_child_requisition
 gtk_widget_size_allocate
+gtk_widget_size_allocate_with_baseline
 gtk_widget_add_accelerator
 gtk_widget_remove_accelerator
 gtk_widget_set_accel_path
@@ -5291,6 +5294,7 @@ gtk_widget_get_allocated_width
 gtk_widget_get_allocated_height
 gtk_widget_get_allocation
 gtk_widget_set_allocation
+gtk_widget_get_allocated_baseline
 gtk_widget_get_app_paintable
 gtk_widget_get_can_default
 gtk_widget_set_can_default
@@ -5351,8 +5355,10 @@ gtk_widget_get_preferred_height
 gtk_widget_get_preferred_width
 gtk_widget_get_preferred_height_for_width
 gtk_widget_get_preferred_width_for_height
+gtk_widget_get_preferred_height_and_baseline_for_width
 gtk_widget_get_request_mode
 gtk_widget_get_preferred_size
+gtk_widget_get_preferred_size_and_baseline
 gtk_distribute_natural_allocation
 
 <SUBSECTION Alignment and Margins>
@@ -5360,6 +5366,7 @@ GtkAlign
 gtk_widget_get_halign
 gtk_widget_set_halign
 gtk_widget_get_valign
+gtk_widget_get_valign_with_baseline
 gtk_widget_set_valign
 gtk_widget_get_margin_left
 gtk_widget_set_margin_left
@@ -7249,6 +7256,10 @@ gtk_grid_set_column_homogeneous
 gtk_grid_get_column_homogeneous
 gtk_grid_set_column_spacing
 gtk_grid_get_column_spacing
+gtk_grid_get_baseline_row
+gtk_grid_set_baseline_row
+gtk_grid_get_row_baseline_position
+gtk_grid_set_row_baseline_position
 
 <SUBSECTION Standard>
 GtkGridClass

gtk/gtk.symbols

@@ -288,6 +288,7 @@ gtk_assistant_set_page_title
 gtk_assistant_set_page_type
 gtk_assistant_update_buttons_state
 gtk_attach_options_get_type
+gtk_baseline_position_get_type
 gtk_binding_entry_add_signal
 gtk_binding_entry_add_signall
 gtk_binding_entry_add_signal_from_string
@@ -308,6 +309,7 @@ gtk_border_free
 gtk_border_get_type
 gtk_border_new
 gtk_border_style_get_type
+gtk_box_get_baseline_position
 gtk_box_get_homogeneous
 gtk_box_get_spacing
 gtk_box_get_type
@@ -316,6 +318,7 @@ gtk_box_pack_end
 gtk_box_pack_start
 gtk_box_query_child_packing
 gtk_box_reorder_child
+gtk_box_set_baseline_position
 gtk_box_set_child_packing
 gtk_box_set_homogeneous
 gtk_box_set_spacing
@@ -1195,9 +1198,11 @@ gtk_grab_get_current
 gtk_grab_remove
 gtk_grid_attach
 gtk_grid_attach_next_to
+gtk_grid_get_baseline_row
 gtk_grid_get_child_at
 gtk_grid_get_column_homogeneous
 gtk_grid_get_column_spacing
+gtk_grid_get_row_baseline_position
 gtk_grid_get_row_homogeneous
 gtk_grid_get_row_spacing
 gtk_grid_get_type
@@ -1207,8 +1212,10 @@ gtk_grid_insert_row
 gtk_grid_new
 gtk_grid_remove_column
 gtk_grid_remove_row
+gtk_grid_set_baseline_row
 gtk_grid_set_column_homogeneous
 gtk_grid_set_column_spacing
+gtk_grid_set_row_baseline_position
 gtk_grid_set_row_homogeneous
 gtk_grid_set_row_spacing
 gtk_handle_box_get_child_detached
@@ -3707,6 +3714,7 @@ gtk_widget_error_bell
 gtk_widget_event
 gtk_widget_freeze_child_notify
 gtk_widget_get_accessible
+gtk_widget_get_allocated_baseline
 gtk_widget_get_allocated_height
 gtk_widget_get_allocated_width
 gtk_widget_get_allocation
@@ -3748,8 +3756,10 @@ gtk_widget_get_parent_window
 gtk_widget_get_path
 gtk_widget_get_pointer
 gtk_widget_get_preferred_height
+gtk_widget_get_preferred_height_and_baseline_for_width
 gtk_widget_get_preferred_height_for_width
 gtk_widget_get_preferred_size
+gtk_widget_get_preferred_size_and_baseline
 gtk_widget_get_preferred_width
 gtk_widget_get_preferred_width_for_height
 gtk_widget_get_realized
@@ -3772,6 +3782,7 @@ gtk_widget_get_tooltip_window
 gtk_widget_get_toplevel
 gtk_widget_get_type
 gtk_widget_get_valign
+gtk_widget_get_valign_with_baseline
 gtk_widget_get_vexpand
 gtk_widget_get_vexpand_set
 gtk_widget_get_visible
@@ -3924,6 +3935,7 @@ gtk_widget_show
 gtk_widget_show_all
 gtk_widget_show_now
 gtk_widget_size_allocate
+gtk_widget_size_allocate_with_baseline
 gtk_widget_size_request
 gtk_widget_style_attach
 gtk_widget_style_get

gtk/gtkalignment.c

@@ -108,6 +108,12 @@ static void gtk_alignment_get_preferred_height_for_width (GtkWidget           *w
 							  gint                 for_size,
 							  gint                *minimum_size,
 							  gint                *natural_size);
+static void gtk_alignment_get_preferred_height_and_baseline_for_width (GtkWidget           *widget,
+								       gint                 for_size,
+								       gint                *minimum_size,
+								       gint                *natural_size,
+								       gint                *minimum_baseline,
+								       gint                *natural_baseline);
 
 G_DEFINE_TYPE (GtkAlignment, gtk_alignment, GTK_TYPE_BIN)
 
@@ -128,6 +134,7 @@ gtk_alignment_class_init (GtkAlignmentClass *class)
   widget_class->get_preferred_height = gtk_alignment_get_preferred_height;
   widget_class->get_preferred_width_for_height = gtk_alignment_get_preferred_width_for_height;
   widget_class->get_preferred_height_for_width = gtk_alignment_get_preferred_height_for_width;
+  widget_class->get_preferred_height_and_baseline_for_width = gtk_alignment_get_preferred_height_and_baseline_for_width;
 
   g_object_class_install_property (gobject_class,
                                    PROP_XALIGN,
@@ -507,6 +514,7 @@ gtk_alignment_size_allocate (GtkWidget     *widget,
   gint width, height;
   guint border_width;
   gint padding_horizontal, padding_vertical;
+  gint baseline;
 
   padding_horizontal = 0;
   padding_vertical = 0;
@@ -520,6 +528,7 @@ gtk_alignment_size_allocate (GtkWidget     *widget,
       gint child_nat_width;
       gint child_nat_height;
       gint child_width, child_height;
+      double yalign, yscale;
 
       border_width = gtk_container_get_border_width (GTK_CONTAINER (alignment));
 
@@ -529,6 +538,25 @@ gtk_alignment_size_allocate (GtkWidget     *widget,
       width  = MAX (1, allocation->width - padding_horizontal - 2 * border_width);
       height = MAX (1, allocation->height - padding_vertical - 2 * border_width);
 
+      baseline = gtk_widget_get_allocated_baseline (widget);
+      if (baseline != -1)
+	baseline -= border_width + priv->padding_top;
+
+      /* If we get a baseline set that means we're baseline aligned, and the parent
+	 honored that. In that case we have to ignore yalign/yscale as we need
+	 yalign based on the baseline and always FILL mode to ensure we can place
+	 the baseline anywhere */
+      if (baseline != -1)
+	{
+	  yalign = 0;
+	  yscale = 1.0;
+	}
+      else
+	{
+	  yalign = priv->yalign;
+	  yscale = priv->yscale;
+	}
+
       if (gtk_widget_get_request_mode (child) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
 	{
 	  gtk_widget_get_preferred_width (child, NULL, &child_nat_width);
@@ -559,8 +587,8 @@ gtk_alignment_size_allocate (GtkWidget     *widget,
 
       if (height > child_height)
 	child_allocation.height = (child_height *
-				   (1.0 - priv->yscale) +
-				   height * priv->yscale);
+				   (1.0 - yscale) +
+				   height * yscale);
       else
 	child_allocation.height = height;
 
@@ -569,9 +597,9 @@ gtk_alignment_size_allocate (GtkWidget     *widget,
       else 
 	child_allocation.x = priv->xalign * (width - child_allocation.width) + allocation->x + border_width + priv->padding_left;
 
-      child_allocation.y = priv->yalign * (height - child_allocation.height) + allocation->y + border_width + priv->padding_top;
+      child_allocation.y = yalign * (height - child_allocation.height) + allocation->y + border_width + priv->padding_top;
 
-      gtk_widget_size_allocate (child, &child_allocation);
+      gtk_widget_size_allocate_with_baseline (child, &child_allocation, baseline);
     }
 }
 
@@ -581,18 +609,30 @@ gtk_alignment_get_preferred_size (GtkWidget      *widget,
                                   GtkOrientation  orientation,
 				  gint            for_size,
                                   gint           *minimum_size,
-                                  gint           *natural_size)
+                                  gint           *natural_size,
+                                  gint           *minimum_baseline,
+                                  gint           *natural_baseline)
 {
   GtkAlignment *alignment = GTK_ALIGNMENT (widget);
   GtkAlignmentPrivate *priv = alignment->priv;
   GtkWidget *child;
   guint minimum, natural;
+  guint top_offset;
+  guint border;
 
-  natural = minimum = gtk_container_get_border_width (GTK_CONTAINER (widget)) * 2;
+  if (minimum_baseline)
+    *minimum_baseline = -1;
+  if (natural_baseline)
+    *natural_baseline = -1;
+
+  border = gtk_container_get_border_width (GTK_CONTAINER (widget));
+  natural = minimum = border * 2;
+  top_offset = border;
 
   if ((child = gtk_bin_get_child (GTK_BIN (widget))) && gtk_widget_get_visible (child))
     {
       gint child_min, child_nat;
+      gint child_min_baseline = -1, child_nat_baseline = -1;
 
       /* Request extra space for the padding: */
       if (orientation == GTK_ORIENTATION_HORIZONTAL)
@@ -619,9 +659,10 @@ gtk_alignment_get_preferred_size (GtkWidget      *widget,
       else
 	{
 	  minimum += (priv->padding_top + priv->padding_bottom);
+	  top_offset += priv->padding_top;
 
 	  if (for_size < 0)
-	    gtk_widget_get_preferred_height (child, &child_min, &child_nat);
+	    gtk_widget_get_preferred_height_and_baseline_for_width (child, -1, &child_min, &child_nat, &child_min_baseline, &child_nat_baseline);
 	  else
 	    {
 	      gint min_width;
@@ -634,8 +675,13 @@ gtk_alignment_get_preferred_size (GtkWidget      *widget,
 		for_size = (min_width * (1.0 - priv->xscale) +
 			    for_size * priv->xscale);
 
-	      gtk_widget_get_preferred_height_for_width (child, for_size, &child_min, &child_nat);
+	      gtk_widget_get_preferred_height_and_baseline_for_width (child, for_size, &child_min, &child_nat, &child_min_baseline, &child_nat_baseline);
 	    }
+
+	  if (minimum_baseline && child_min_baseline >= 0)
+	    *minimum_baseline = child_min_baseline + top_offset;
+	  if (natural_baseline && child_nat_baseline >= 0)
+	    *natural_baseline = child_nat_baseline + top_offset;
 	}
 
       natural = minimum;
@@ -656,7 +702,7 @@ gtk_alignment_get_preferred_width (GtkWidget      *widget,
                                    gint           *minimum_size,
                                    gint           *natural_size)
 {
-  gtk_alignment_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, -1, minimum_size, natural_size);
+  gtk_alignment_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, -1, minimum_size, natural_size, NULL, NULL);
 }
 
 static void
@@ -664,7 +710,7 @@ gtk_alignment_get_preferred_height (GtkWidget      *widget,
                                     gint           *minimum_size,
                                     gint           *natural_size)
 {
-  gtk_alignment_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, -1, minimum_size, natural_size);
+  gtk_alignment_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, -1, minimum_size, natural_size, NULL, NULL);
 }
 
 
@@ -674,7 +720,7 @@ gtk_alignment_get_preferred_width_for_height (GtkWidget           *widget,
 					      gint                *minimum_size,
 					      gint                *natural_size)
 {
-  gtk_alignment_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, for_size, minimum_size, natural_size);
+  gtk_alignment_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, for_size, minimum_size, natural_size, NULL, NULL);
 }
 
 static void
@@ -683,9 +729,21 @@ gtk_alignment_get_preferred_height_for_width (GtkWidget           *widget,
 					      gint                *minimum_size,
 					      gint                *natural_size)
 {
-  gtk_alignment_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, for_size, minimum_size, natural_size);
+  gtk_alignment_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, for_size, minimum_size, natural_size, NULL, NULL);
 }
 
+static void
+gtk_alignment_get_preferred_height_and_baseline_for_width (GtkWidget           *widget,
+							   gint                 for_size,
+							   gint                *minimum_size,
+							   gint                *natural_size,
+							   gint                *minimum_baseline,
+							   gint                *natural_baseline)
+{
+  gtk_alignment_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, for_size, minimum_size, natural_size, minimum_baseline, natural_baseline);
+}
+
+
 /**
  * gtk_alignment_set_padding:
  * @alignment: a #GtkAlignment

gtk/gtkbbox.c

@@ -101,6 +101,12 @@ static void gtk_button_box_get_preferred_height_for_width (GtkWidget *widget,
                                                            gint       width,
                                                            gint      *minimum,
                                                            gint      *natural);
+static void gtk_button_box_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+									gint       width,
+									gint      *minimum,
+									gint      *natural,
+									gint      *minimum_baseline,
+									gint      *natural_baseline);
 
 static void gtk_button_box_size_allocate      (GtkWidget         *widget,
                                                GtkAllocation     *allocation);
@@ -143,6 +149,7 @@ gtk_button_box_class_init (GtkButtonBoxClass *class)
   widget_class->get_preferred_height = gtk_button_box_get_preferred_height;
   widget_class->get_preferred_width_for_height = gtk_button_box_get_preferred_width_for_height;
   widget_class->get_preferred_height_for_width = gtk_button_box_get_preferred_height_for_width;
+  widget_class->get_preferred_height_and_baseline_for_width = gtk_button_box_get_preferred_height_and_baseline_for_width;
   widget_class->size_allocate = gtk_button_box_size_allocate;
 
   container_class->remove = gtk_button_box_remove;
@@ -438,7 +445,10 @@ gtk_button_box_child_requisition (GtkWidget  *widget,
                                   gint       *nvis_children,
                                   gint       *nvis_secondaries,
                                   gint      **widths,
-                                  gint      **heights)
+                                  gint      **heights,
+                                  gint      **baselines,
+				  gint       *baseline,
+				  gint       *baseline_height)
 {
   GtkButtonBox *bbox;
   GList *children, *list;
@@ -446,6 +456,7 @@ gtk_button_box_child_requisition (GtkWidget  *widget,
   gint nsecondaries;
   gint needed_width;
   gint needed_height;
+  gint needed_above, needed_below;
   gint avg_w, avg_h;
   GtkRequisition child_requisition;
   gint ipad_w;
@@ -456,11 +467,15 @@ gtk_button_box_child_requisition (GtkWidget  *widget,
   gint ipad_y;
   gboolean homogeneous;
   gint i;
+  gint max_above, max_below, child_baseline;
+  GtkOrientation orientation;
+  gboolean have_baseline;
 
   g_return_if_fail (GTK_IS_BUTTON_BOX (widget));
 
   bbox = GTK_BUTTON_BOX (widget);
 
+  orientation = gtk_orientable_get_orientation (GTK_ORIENTABLE (widget));
   homogeneous = gtk_box_get_homogeneous (GTK_BOX (widget));
 
   gtk_widget_style_get (widget,
@@ -475,22 +490,33 @@ gtk_button_box_child_requisition (GtkWidget  *widget,
   list = children = _gtk_box_get_children (GTK_BOX (bbox));
   needed_width = child_min_width;
   needed_height = child_min_height;
+  needed_above = 0;
+  needed_below = 0;
   ipad_w = ipad_x * 2;
   ipad_h = ipad_y * 2;
 
+  have_baseline = FALSE;
+  max_above = max_below = 0;
   avg_w = avg_h = 0;
-  while (children)
+  for (children = list; children != NULL; children = children->next)
     {
       GtkWidget *child;
 
       child = children->data;
-      children = children->next;
 
       if (gtk_widget_get_visible (child))
         {
           nchildren += 1;
-          gtk_widget_get_preferred_size (child,
-                                         &child_requisition, NULL);
+          gtk_widget_get_preferred_size_and_baseline (child,
+						      &child_requisition, NULL, &child_baseline, NULL);
+	  if (orientation == GTK_ORIENTATION_HORIZONTAL &&
+	      gtk_widget_get_valign_with_baseline (child) == GTK_ALIGN_BASELINE &&
+	      child_baseline != -1)
+	    {
+	      have_baseline = TRUE;
+	      max_above = MAX (max_above, child_baseline + ipad_y);
+	      max_below = MAX (max_below , child_requisition.height + ipad_h - (child_baseline + ipad_y));
+	    }
           avg_w += child_requisition.width + ipad_w;
           avg_h += child_requisition.height + ipad_h;
         }
@@ -498,8 +524,14 @@ gtk_button_box_child_requisition (GtkWidget  *widget,
   avg_w /= MAX (nchildren, 1);
   avg_h /= MAX (nchildren, 1);
 
+  if (baseline)
+    *baseline = have_baseline ? max_above : -1;
+  if (baseline_height)
+    *baseline_height = max_above + max_below;
+
   *widths = g_new (gint, nchildren);
   *heights = g_new (gint, nchildren);
+  *baselines = g_new (gint, nchildren);
 
   i = 0;
   children = list;
@@ -520,7 +552,8 @@ gtk_button_box_child_requisition (GtkWidget  *widget,
           if (is_secondary)
             nsecondaries++;
 
-          gtk_widget_get_preferred_size (child, &child_requisition, NULL);
+          gtk_widget_get_preferred_size_and_baseline (child,
+						      &child_requisition, NULL, &child_baseline, NULL);
 
           if (homogeneous ||
               (!non_homogeneous && (child_requisition.width + ipad_w < avg_w * 1.5)))
@@ -534,16 +567,38 @@ gtk_button_box_child_requisition (GtkWidget  *widget,
               (*widths)[i] = child_requisition.width + ipad_w;
             }
 
+	  (*baselines)[i] = -1;
+
           if (homogeneous ||
               (!non_homogeneous && (child_requisition.height + ipad_h < avg_h * 1.5)))
             {
               (*heights)[i] = -1;
-              if (child_requisition.height + ipad_h > needed_height)
-                needed_height = child_requisition.height + ipad_h;
+
+	      if (orientation == GTK_ORIENTATION_HORIZONTAL &&
+		  gtk_widget_get_valign_with_baseline (child) == GTK_ALIGN_BASELINE &&
+		  child_baseline != -1)
+		{
+		  (*baselines)[i] = child_baseline + ipad_y;
+
+		  if (child_baseline + ipad_y > needed_above)
+		    needed_above = child_baseline + ipad_y;
+		  if (child_requisition.height - child_baseline + ipad_y > needed_below)
+		    needed_below = child_requisition.height - child_baseline + ipad_y;
+		}
+	      else
+		{
+		  if (child_requisition.height + ipad_h > needed_height)
+		    needed_height = child_requisition.height + ipad_h;
+		}
             }
           else
             {
               (*heights)[i] = child_requisition.height + ipad_h;
+
+	      if (orientation == GTK_ORIENTATION_HORIZONTAL &&
+		  gtk_widget_get_valign_with_baseline (child) == GTK_ALIGN_BASELINE &&
+		  child_baseline != -1)
+		(*baselines)[i] = child_baseline + ipad_y;
             }
 
           i++;
@@ -552,12 +607,18 @@ gtk_button_box_child_requisition (GtkWidget  *widget,
 
   g_list_free (list);
 
+  needed_height = MAX (needed_height, needed_above + needed_below);
+
   for (i = 0; i < nchildren; i++)
     {
       if ((*widths)[i] == -1)
         (*widths)[i] = needed_width;
       if ((*heights)[i] == -1)
-        (*heights)[i] = needed_height;
+	{
+	  (*heights)[i] = needed_height;
+	  if ((*baselines)[i] != -1)
+	    (*baselines)[i] = needed_above;
+	}
     }
 
   if (nvis_children)
@@ -569,19 +630,24 @@ gtk_button_box_child_requisition (GtkWidget  *widget,
 
 static void
 gtk_button_box_size_request (GtkWidget      *widget,
-                             GtkRequisition *requisition)
+                             GtkRequisition *requisition,
+			     gint           *baseline)
 {
   GtkButtonBoxPrivate *priv;
   GtkButtonBox *bbox;
   gint nvis_children;
-  gint max_size;
+  gint max_size, max_above, max_below;
   gint total_size;
   gint spacing;
   GtkOrientation orientation;
   gint *widths;
   gint *heights;
+  gint *baselines;
   gint i;
 
+  if (baseline)
+    *baseline = -1;
+
   bbox = GTK_BUTTON_BOX (widget);
   priv = bbox->priv;
 
@@ -591,16 +657,22 @@ gtk_button_box_size_request (GtkWidget      *widget,
   gtk_button_box_child_requisition (widget,
                                     &nvis_children,
                                     NULL,
-                                    &widths, &heights);
+                                    &widths, &heights, &baselines, baseline, NULL);
 
-  max_size = 0;
+  max_size = max_above = max_below = 0;
   total_size = 0;
   for (i = 0; i < nvis_children; i++)
     {
       if (orientation == GTK_ORIENTATION_HORIZONTAL)
         {
           total_size += widths[i];
-          max_size = MAX (max_size, heights[i]);
+	  if (baselines[i] == -1)
+	    max_size = MAX (max_size, heights[i]);
+	  else
+	    {
+	      max_above = MAX (max_above, baselines[i]);
+	      max_below = MAX (max_below, heights[i] - baselines[i]);
+	    }
         }
       else
         {
@@ -610,6 +682,23 @@ gtk_button_box_size_request (GtkWidget      *widget,
     }
   g_free (widths);
   g_free (heights);
+  g_free (baselines);
+
+  max_size = MAX (max_size, max_above + max_below);
+
+  switch (gtk_box_get_baseline_position (GTK_BOX (widget)))
+    {
+    case GTK_BASELINE_POSITION_TOP:
+      break;
+    case GTK_BASELINE_POSITION_CENTER:
+      if (baseline != NULL && *baseline != -1)
+	*baseline += (max_size - (max_above + max_below)) / 2;
+      break;
+    case GTK_BASELINE_POSITION_BOTTOM:
+      if (baseline != NULL && *baseline != -1)
+	*baseline += max_size - (max_above + max_below);
+      break;
+    }
 
   if (nvis_children == 0)
     {
@@ -656,7 +745,7 @@ gtk_button_box_get_preferred_width (GtkWidget *widget,
 {
   GtkRequisition requisition;
 
-  gtk_button_box_size_request (widget, &requisition);
+  gtk_button_box_size_request (widget, &requisition, NULL);
 
   *minimum = *natural = requisition.width;
 }
@@ -666,11 +755,9 @@ gtk_button_box_get_preferred_height (GtkWidget *widget,
                                      gint      *minimum,
                                      gint      *natural)
 {
-  GtkRequisition requisition;
-
-  gtk_button_box_size_request (widget, &requisition);
-
-  *minimum = *natural = requisition.height;
+  gtk_button_box_get_preferred_height_and_baseline_for_width (widget, -1,
+							      minimum, natural,
+							      NULL, NULL);
 }
 
 static void
@@ -691,6 +778,26 @@ gtk_button_box_get_preferred_height_for_width (GtkWidget *widget,
   gtk_button_box_get_preferred_height (widget, minimum, natural);
 }
 
+static void
+gtk_button_box_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+							    gint       width,
+							    gint      *minimum,
+							    gint      *natural,
+							    gint      *minimum_baseline,
+							    gint      *natural_baseline)
+{
+  GtkRequisition requisition;
+  gint baseline;
+
+  gtk_button_box_size_request (widget, &requisition, &baseline);
+
+  *minimum = *natural = requisition.height;
+  if (minimum_baseline)
+    *minimum_baseline = baseline;
+  if (natural_baseline)
+    *natural_baseline = baseline;
+}
+
 static void
 gtk_button_box_size_allocate (GtkWidget     *widget,
                               GtkAllocation *allocation)
@@ -714,10 +821,13 @@ gtk_button_box_size_allocate (GtkWidget     *widget,
   gint ipad_x, ipad_y;
   gint *widths;
   gint *heights;
+  gint *baselines;
   gint *sizes;
   gint primary_size;
   gint secondary_size;
   gint total_size;
+  gint baseline, baseline_height;
+  gint child_baseline, allocated_baseline;
   gint i;
 
   bbox = GTK_BUTTON_BOX (widget);
@@ -733,7 +843,27 @@ gtk_button_box_size_allocate (GtkWidget     *widget,
   gtk_button_box_child_requisition (widget,
                                     &nvis_children,
                                     &n_secondaries,
-                                    &widths, &heights);
+                                    &widths, &heights, &baselines, &baseline, &baseline_height);
+
+  allocated_baseline = gtk_widget_get_allocated_baseline (widget);
+  if (allocated_baseline != -1)
+    baseline = allocated_baseline;
+  else if (baseline != -1)
+    {
+      /* TODO: modify baseline based on baseline_pos && allocated_baseline*/
+      switch (gtk_box_get_baseline_position (GTK_BOX (widget)))
+	{
+	case GTK_BASELINE_POSITION_TOP:
+	  baseline = baseline;
+	  break;
+	case GTK_BASELINE_POSITION_CENTER:
+	  baseline = baseline + (allocation->height - baseline_height) / 2;
+	  break;
+	case GTK_BASELINE_POSITION_BOTTOM:
+	  baseline = allocation->height - (baseline_height - baseline);
+	  break;
+	}
+    }
 
   n_primaries = nvis_children - n_secondaries;
   primary_size = 0;
@@ -917,10 +1047,17 @@ gtk_button_box_size_allocate (GtkWidget     *widget,
         {
           child_allocation.width = widths[i];
           child_allocation.height = heights[i];
+	  child_baseline = -1;
 
           if (orientation == GTK_ORIENTATION_HORIZONTAL)
             {
-              child_allocation.y = allocation->y + (allocation->height - child_allocation.height) / 2;
+	      if (baselines[i] != -1)
+		{
+		  child_allocation.y = allocation->y + baseline - baselines[i];
+		  child_baseline = baselines[i];
+		}
+	      else
+		child_allocation.y = allocation->y + (allocation->height - child_allocation.height) / 2;
 
               if (gtk_button_box_get_child_secondary (bbox, child))
                 {
@@ -953,7 +1090,7 @@ gtk_button_box_size_allocate (GtkWidget     *widget,
                 }
             }
 
-          gtk_widget_size_allocate (child, &child_allocation);
+          gtk_widget_size_allocate_with_baseline (child, &child_allocation, child_baseline);
           i++;
         }
     }
@@ -961,6 +1098,7 @@ gtk_button_box_size_allocate (GtkWidget     *widget,
   g_list_free (list);
   g_free (widths);
   g_free (heights);
+  g_free (baselines);
 }
 
 /**

gtk/gtkbox.c

@@ -94,7 +94,8 @@ enum {
   PROP_0,
   PROP_ORIENTATION,
   PROP_SPACING,
-  PROP_HOMOGENEOUS
+  PROP_HOMOGENEOUS,
+  PROP_BASELINE_POSITION
 };
 
 enum {
@@ -116,6 +117,7 @@ struct _GtkBoxPrivate
   guint           default_expand : 1;
   guint           homogeneous    : 1;
   guint           spacing_set    : 1;
+  guint           baseline_pos   : 2;
 };
 
 typedef struct _GtkBoxChild        GtkBoxChild;
@@ -200,6 +202,12 @@ static void               gtk_box_get_preferred_height_for_width (GtkWidget
                                                                   gint                 width,
                                                                   gint                *minimum_height,
                                                                   gint                *natural_height);
+static void  gtk_box_get_preferred_height_and_baseline_for_width (GtkWidget           *widget,
+								  gint                 width,
+								  gint                *minimum_height,
+								  gint                *natural_height,
+								  gint                *minimum_baseline,
+								  gint                *natural_baseline);
 
 
 G_DEFINE_TYPE_WITH_CODE (GtkBox, gtk_box, GTK_TYPE_CONTAINER,
@@ -220,6 +228,7 @@ gtk_box_class_init (GtkBoxClass *class)
   widget_class->get_preferred_width            = gtk_box_get_preferred_width;
   widget_class->get_preferred_height           = gtk_box_get_preferred_height;
   widget_class->get_preferred_height_for_width = gtk_box_get_preferred_height_for_width;
+  widget_class->get_preferred_height_and_baseline_for_width = gtk_box_get_preferred_height_and_baseline_for_width;
   widget_class->get_preferred_width_for_height = gtk_box_get_preferred_width_for_height;
   widget_class->compute_expand                 = gtk_box_compute_expand;
   widget_class->direction_changed              = gtk_box_direction_changed;
@@ -255,6 +264,15 @@ gtk_box_class_init (GtkBoxClass *class)
 							 FALSE,
 							 GTK_PARAM_READWRITE));
 
+  g_object_class_install_property (object_class,
+                                   PROP_BASELINE_POSITION,
+                                   g_param_spec_enum ("baseline-position",
+                                                     P_("Baseline position"),
+                                                     P_("The position of the baseline aligned widgets if extra space is availible"),
+                                                     GTK_TYPE_BASELINE_POSITION,
+                                                     GTK_BASELINE_POSITION_CENTER,
+                                                     GTK_PARAM_READWRITE));
+
   /**
    * GtkBox:expand:
    *
@@ -340,6 +358,7 @@ gtk_box_init (GtkBox *box)
   private->homogeneous = FALSE;
   private->spacing = 0;
   private->spacing_set = FALSE;
+  private->baseline_pos = GTK_BASELINE_POSITION_CENTER;
 }
 
 static void
@@ -361,6 +380,9 @@ gtk_box_set_property (GObject      *object,
     case PROP_SPACING:
       gtk_box_set_spacing (box, g_value_get_int (value));
       break;
+    case PROP_BASELINE_POSITION:
+      gtk_box_set_baseline_position (box, g_value_get_enum (value));
+      break;
     case PROP_HOMOGENEOUS:
       gtk_box_set_homogeneous (box, g_value_get_boolean (value));
       break;
@@ -387,6 +409,9 @@ gtk_box_get_property (GObject    *object,
     case PROP_SPACING:
       g_value_set_int (value, private->spacing);
       break;
+    case PROP_BASELINE_POSITION:
+      g_value_set_enum (value, private->baseline_pos);
+      break;
     case PROP_HOMOGENEOUS:
       g_value_set_boolean (value, private->homogeneous);
       break;
@@ -435,6 +460,11 @@ gtk_box_size_allocate (GtkWidget     *widget,
   GtkTextDirection direction;
   GtkAllocation child_allocation;
   GtkRequestedSize *sizes;
+  gint child_minimum_baseline, child_natural_baseline;
+  gint minimum_above, natural_above;
+  gint minimum_below, natural_below;
+  gboolean have_baseline;
+  gint baseline;
 
   GtkPackType packing;
 
@@ -461,6 +491,10 @@ gtk_box_size_allocate (GtkWidget     *widget,
   else
     size = allocation->height - (nvis_children - 1) * private->spacing;
 
+  have_baseline = FALSE;
+  minimum_above = natural_above = 0;
+  minimum_below = natural_below = 0;
+
   /* Retrieve desired size for visible children. */
   for (i = 0, children = private->children; children; children = children->next)
     {
@@ -475,11 +509,11 @@ gtk_box_size_allocate (GtkWidget     *widget,
                                                    &sizes[i].minimum_size,
                                                    &sizes[i].natural_size);
       else
-	gtk_widget_get_preferred_height_for_width (child->widget,
-                                                   allocation->width,
-                                                   &sizes[i].minimum_size,
-                                                   &sizes[i].natural_size);
-
+	gtk_widget_get_preferred_height_and_baseline_for_width (child->widget,
+								allocation->width,
+								&sizes[i].minimum_size,
+								&sizes[i].natural_size,
+								NULL, NULL);
 
       /* Assert the api is working properly */
       if (sizes[i].minimum_size < 0)
@@ -537,28 +571,9 @@ gtk_box_size_allocate (GtkWidget     *widget,
 	extra = 0;
     }
 
-  /* Allocate child positions. */
+  /* Allocate child sizes. */
   for (packing = GTK_PACK_START; packing <= GTK_PACK_END; ++packing)
     {
-      if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
-	{
-	  child_allocation.y = allocation->y;
-	  child_allocation.height = MAX (1, allocation->height);
-	  if (packing == GTK_PACK_START)
-	    x = allocation->x;
-	  else
-	    x = allocation->x + allocation->width;
-	}
-      else
-	{
-	  child_allocation.x = allocation->x;
-	  child_allocation.width = MAX (1, allocation->width);
-	  if (packing == GTK_PACK_START)
-	    y = allocation->y;
-	  else
-	    y = allocation->y + allocation->height;
-	}
-
       for (i = 0, children = private->children;
 	   children;
 	   children = children->next)
@@ -605,6 +620,105 @@ gtk_box_size_allocate (GtkWidget     *widget,
 		}
 	    }
 
+	  sizes[i].natural_size = child_size;
+
+	  if (private->orientation == GTK_ORIENTATION_HORIZONTAL &&
+	      gtk_widget_get_valign_with_baseline (child->widget) == GTK_ALIGN_BASELINE)
+	    {
+	      int child_allocation_width;
+	      int child_minimum_height, child_natural_height;
+
+	      if (child->fill)
+		child_allocation_width = MAX (1, child_size - child->padding * 2);
+	      else
+		child_allocation_width = sizes[i].minimum_size;
+
+	      child_minimum_baseline = -1;
+	      child_natural_baseline = -1;
+	      gtk_widget_get_preferred_height_and_baseline_for_width (child->widget,
+								      child_allocation_width,
+								      &child_minimum_height, &child_natural_height,
+								      &child_minimum_baseline, &child_natural_baseline);
+
+	      if (child_minimum_baseline >= 0)
+		{
+		  have_baseline = TRUE;
+		  minimum_below = MAX (minimum_below, child_minimum_height - child_minimum_baseline);
+		  natural_below = MAX (natural_below, child_natural_height - child_natural_baseline);
+		  minimum_above = MAX (minimum_above, child_minimum_baseline);
+		  natural_above = MAX (natural_above, child_natural_baseline);
+		}
+	    }
+
+	  i++;
+	}
+    }
+
+  baseline = gtk_widget_get_allocated_baseline (widget);
+  if (baseline == -1 && have_baseline)
+    {
+      gint height = MAX (1, allocation->height);
+
+      /* TODO: This is purely based on the minimum baseline, when things fit we should
+	 use the natural one? */
+
+      switch (private->baseline_pos)
+	{
+	case GTK_BASELINE_POSITION_TOP:
+	  baseline = minimum_above;
+	  break;
+	case GTK_BASELINE_POSITION_CENTER:
+	  baseline = minimum_above + (height - (minimum_above + minimum_below)) / 2;
+	  break;
+	case GTK_BASELINE_POSITION_BOTTOM:
+	  baseline = height - minimum_below;
+	  break;
+	}
+    }
+
+  /* Allocate child positions. */
+  for (packing = GTK_PACK_START; packing <= GTK_PACK_END; ++packing)
+    {
+      if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
+	{
+	  child_allocation.y = allocation->y;
+	  child_allocation.height = MAX (1, allocation->height);
+	  if (packing == GTK_PACK_START)
+	    x = allocation->x;
+	  else
+	    x = allocation->x + allocation->width;
+	}
+      else
+	{
+	  child_allocation.x = allocation->x;
+	  child_allocation.width = MAX (1, allocation->width);
+	  if (packing == GTK_PACK_START)
+	    y = allocation->y;
+	  else
+	    y = allocation->y + allocation->height;
+	}
+
+      for (i = 0, children = private->children;
+	   children;
+	   children = children->next)
+	{
+	  child = children->data;
+
+	  /* If widget is not visible, skip it. */
+	  if (!gtk_widget_get_visible (child->widget))
+	    continue;
+
+	  /* If widget is packed differently skip it, but still increment i,
+	   * since widget is visible and will be handled in next loop iteration.
+	   */
+	  if (child->pack != packing)
+	    {
+	      i++;
+	      continue;
+	    }
+
+	  child_size = sizes[i].natural_size;
+
 	  /* Assign the child's position. */
 	  if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
 	    {
@@ -658,7 +772,7 @@ gtk_box_size_allocate (GtkWidget     *widget,
 		  child_allocation.y -= child_size;
 		}
 	    }
-	  gtk_widget_size_allocate (child->widget, &child_allocation);
+	  gtk_widget_size_allocate_with_baseline (child->widget, &child_allocation, baseline);
 
 	  i++;
 	}
@@ -1015,18 +1129,28 @@ static void
 gtk_box_get_size (GtkWidget      *widget,
 		  GtkOrientation  orientation,
 		  gint           *minimum_size,
-		  gint           *natural_size)
+		  gint           *natural_size,
+		  gint           *minimum_baseline,
+		  gint           *natural_baseline)
 {
   GtkBox *box;
   GtkBoxPrivate *private;
   GList *children;
   gint nvis_children;
   gint minimum, natural;
+  gint minimum_above, natural_above;
+  gint minimum_below, natural_below;
+  gboolean have_baseline;
+  gint min_baseline, nat_baseline;
 
   box = GTK_BOX (widget);
   private = box->priv;
 
+  have_baseline = FALSE;
   minimum = natural = 0;
+  minimum_above = natural_above = 0;
+  minimum_below = natural_below = 0;
+  min_baseline = nat_baseline = -1;
 
   nvis_children = 0;
 
@@ -1037,13 +1161,15 @@ gtk_box_get_size (GtkWidget      *widget,
       if (gtk_widget_get_visible (child->widget))
         {
           gint child_minimum, child_natural;
+          gint child_minimum_baseline = -1, child_natural_baseline = -1;
 
 	  if (orientation == GTK_ORIENTATION_HORIZONTAL)
 	    gtk_widget_get_preferred_width (child->widget,
                                             &child_minimum, &child_natural);
 	  else
-	    gtk_widget_get_preferred_height (child->widget,
-                                             &child_minimum, &child_natural);
+	    gtk_widget_get_preferred_height_and_baseline_for_width (child->widget, -1,
+								    &child_minimum, &child_natural,
+								    &child_minimum_baseline, &child_natural_baseline);
 
           if (private->orientation == orientation)
 	    {
@@ -1065,9 +1191,20 @@ gtk_box_get_size (GtkWidget      *widget,
 	    }
 	  else
 	    {
-	      /* The biggest mins and naturals in the opposing orientation */
-              minimum = MAX (minimum, child_minimum);
-              natural = MAX (natural, child_natural);
+	      if (child_minimum_baseline >= 0)
+		{
+		  have_baseline = TRUE;
+		  minimum_below = MAX (minimum_below, child_minimum - child_minimum_baseline);
+		  natural_below = MAX (natural_below, child_natural - child_natural_baseline);
+		  minimum_above = MAX (minimum_above, child_minimum_baseline);
+		  natural_above = MAX (natural_above, child_natural_baseline);
+		}
+	      else
+		{
+		  /* The biggest mins and naturals in the opposing orientation */
+		  minimum = MAX (minimum, child_minimum);
+		  natural = MAX (natural, child_natural);
+		}
 	    }
 
           nvis_children += 1;
@@ -1085,11 +1222,39 @@ gtk_box_get_size (GtkWidget      *widget,
       natural += (nvis_children - 1) * private->spacing;
     }
 
+  minimum = MAX (minimum, minimum_below + minimum_above);
+  natural = MAX (natural, natural_below + natural_above);
+
+  if (have_baseline)
+    {
+      switch (private->baseline_pos)
+	{
+	case GTK_BASELINE_POSITION_TOP:
+	  min_baseline = minimum_above;
+	  nat_baseline = natural_above;
+	  break;
+	case GTK_BASELINE_POSITION_CENTER:
+	  min_baseline = minimum_above + (minimum - (minimum_above + minimum_below)) / 2;
+	  nat_baseline = natural_above + (natural - (natural_above + natural_below)) / 2;
+	  break;
+	case GTK_BASELINE_POSITION_BOTTOM:
+	  min_baseline = minimum - minimum_below;
+	  nat_baseline = natural - natural_below;
+	  break;
+	}
+    }
+
   if (minimum_size)
     *minimum_size = minimum;
 
   if (natural_size)
     *natural_size = natural;
+
+  if (minimum_baseline)
+    *minimum_baseline = min_baseline;
+
+  if (natural_baseline)
+    *natural_baseline = nat_baseline;
 }
 
 static void
@@ -1097,7 +1262,7 @@ gtk_box_get_preferred_width (GtkWidget *widget,
                              gint      *minimum_size,
                              gint      *natural_size)
 {
-  gtk_box_get_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
+  gtk_box_get_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size, NULL, NULL);
 }
 
 static void
@@ -1105,14 +1270,16 @@ gtk_box_get_preferred_height (GtkWidget *widget,
                               gint      *minimum_size,
                               gint      *natural_size)
 {
-  gtk_box_get_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
+  gtk_box_get_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size, NULL, NULL);
 }
 
 static void
 gtk_box_compute_size_for_opposing_orientation (GtkBox *box,
 					       gint    avail_size,
 					       gint   *minimum_size,
-					       gint   *natural_size)
+					       gint   *natural_size,
+					       gint   *minimum_baseline,
+					       gint   *natural_baseline)
 {
   GtkBoxPrivate       *private = box->priv;
   GtkBoxChild      *child;
@@ -1120,11 +1287,16 @@ gtk_box_compute_size_for_opposing_orientation (GtkBox *box,
   gint              nvis_children;
   gint              nexpand_children;
   gint              computed_minimum = 0, computed_natural = 0;
+  gint              computed_minimum_above = 0, computed_natural_above = 0;
+  gint              computed_minimum_below = 0, computed_natural_below = 0;
+  gint              computed_minimum_baseline = -1, computed_natural_baseline = -1;
   GtkRequestedSize *sizes;
   GtkPackType       packing;
   gint              size, extra, i;
   gint              child_size, child_minimum, child_natural;
+  gint              child_minimum_baseline, child_natural_baseline;
   gint              n_extra_widgets = 0;
+  gboolean          have_baseline;
 
   count_expand_children (box, &nvis_children, &nexpand_children);
 
@@ -1199,6 +1371,7 @@ gtk_box_compute_size_for_opposing_orientation (GtkBox *box,
 	extra = 0;
     }
 
+  have_baseline = FALSE;
   /* Allocate child positions. */
   for (packing = GTK_PACK_START; packing <= GTK_PACK_END; ++packing)
     {
@@ -1260,26 +1433,64 @@ gtk_box_compute_size_for_opposing_orientation (GtkBox *box,
 		}
 
 
+	      child_minimum_baseline = child_natural_baseline = -1;
 	      /* Assign the child's position. */
 	      if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
-		gtk_widget_get_preferred_height_for_width (child->widget,
-                                                           child_size, &child_minimum, &child_natural);
+		gtk_widget_get_preferred_height_and_baseline_for_width (child->widget, child_size,
+									&child_minimum, &child_natural,
+									&child_minimum_baseline, &child_natural_baseline);
 	      else /* (private->orientation == GTK_ORIENTATION_VERTICAL) */
 		gtk_widget_get_preferred_width_for_height (child->widget,
                                                            child_size, &child_minimum, &child_natural);
 
-
-	      computed_minimum = MAX (computed_minimum, child_minimum);
-	      computed_natural = MAX (computed_natural, child_natural);
+	      if (child_minimum_baseline >= 0)
+		{
+		  have_baseline = TRUE;
+		  computed_minimum_below = MAX (computed_minimum_below, child_minimum - child_minimum_baseline);
+		  computed_natural_below = MAX (computed_natural_below, child_natural - child_natural_baseline);
+		  computed_minimum_above = MAX (computed_minimum_above, child_minimum_baseline);
+		  computed_natural_above = MAX (computed_natural_above, child_natural_baseline);
+		}
+	      else
+		{
+		  computed_minimum = MAX (computed_minimum, child_minimum);
+		  computed_natural = MAX (computed_natural, child_natural);
+		}
 	    }
 	  i += 1;
 	}
     }
 
+  if (have_baseline)
+    {
+      computed_minimum = MAX (computed_minimum, computed_minimum_below + computed_minimum_above);
+      computed_natural = MAX (computed_natural, computed_natural_below + computed_natural_above);
+      switch (private->baseline_pos)
+	{
+	case GTK_BASELINE_POSITION_TOP:
+	  computed_minimum_baseline = computed_minimum_above;
+	  computed_natural_baseline = computed_natural_above;
+	  break;
+	case GTK_BASELINE_POSITION_CENTER:
+	  computed_minimum_baseline = computed_minimum_above + MAX((computed_minimum - (computed_minimum_above + computed_minimum_below)) / 2, 0);
+	  computed_natural_baseline = computed_natural_above + MAX((computed_natural - (computed_natural_above + computed_natural_below)) / 2, 0);
+	  break;
+	case GTK_BASELINE_POSITION_BOTTOM:
+	  computed_minimum_baseline = computed_minimum - computed_minimum_below;
+	  computed_natural_baseline = computed_natural - computed_natural_below;
+	  break;
+	}
+    }
+
+  if (minimum_baseline)
+    *minimum_baseline = computed_minimum_baseline;
+  if (natural_baseline)
+    *natural_baseline = computed_natural_baseline;
+
   if (minimum_size)
     *minimum_size = computed_minimum;
   if (natural_size)
-    *natural_size = computed_natural;
+    *natural_size = MAX (computed_natural, computed_natural_below + computed_natural_above);
 }
 
 static void
@@ -1355,24 +1566,46 @@ gtk_box_get_preferred_width_for_height (GtkWidget *widget,
   GtkBoxPrivate *private = box->priv;
 
   if (private->orientation == GTK_ORIENTATION_VERTICAL)
-    gtk_box_compute_size_for_opposing_orientation (box, height, minimum_width, natural_width);
+    gtk_box_compute_size_for_opposing_orientation (box, height, minimum_width, natural_width, NULL, NULL);
   else
     gtk_box_compute_size_for_orientation (box, height, minimum_width, natural_width);
 }
 
+static void
+gtk_box_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+						     gint       width,
+						     gint      *minimum_height,
+						     gint      *natural_height,
+						     gint      *minimum_baseline,
+						     gint      *natural_baseline)
+{
+  GtkBox        *box     = GTK_BOX (widget);
+  GtkBoxPrivate *private = box->priv;
+
+  if (width < 0)
+    gtk_box_get_size (widget, GTK_ORIENTATION_VERTICAL, minimum_height, natural_height, minimum_baseline, natural_baseline);
+  else
+    {
+      if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
+	gtk_box_compute_size_for_opposing_orientation (box, width, minimum_height, natural_height, minimum_baseline, natural_baseline);
+      else
+	{
+	  if (minimum_baseline)
+	    *minimum_baseline = -1;
+	  if (natural_baseline)
+	    *natural_baseline = -1;
+	  gtk_box_compute_size_for_orientation (box, width, minimum_height, natural_height);
+	}
+    }
+}
+
 static void
 gtk_box_get_preferred_height_for_width (GtkWidget *widget,
                                         gint       width,
                                         gint      *minimum_height,
                                         gint      *natural_height)
 {
-  GtkBox        *box     = GTK_BOX (widget);
-  GtkBoxPrivate *private = box->priv;
-
-  if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
-    gtk_box_compute_size_for_opposing_orientation (box, width, minimum_height, natural_height);
-  else
-    gtk_box_compute_size_for_orientation (box, width, minimum_height, natural_height);
+  gtk_box_get_preferred_height_and_baseline_for_width (widget, width, minimum_height, natural_height, NULL, NULL);
 }
 
 /**
@@ -1550,6 +1783,59 @@ gtk_box_get_spacing (GtkBox *box)
   return box->priv->spacing;
 }
 
+/**
+ * gtk_box_set_baseline_position:
+ * @box: a #GtkBox
+ * @position: a #GtkBaselinePosition
+ *
+ * Sets the baseline position of a box. This affects
+ * only horizontal boxes with at least one baseline aligned
+ * child. If there is more vertical space availible than requested,
+ * and the baseline is not allocated by the parent then
+ * @position is used to allocate the baseline wrt the
+ * extra space available.
+ *
+ * Since: 3.10
+ */
+void
+gtk_box_set_baseline_position (GtkBox             *box,
+			       GtkBaselinePosition position)
+{
+  GtkBoxPrivate *private;
+
+  g_return_if_fail (GTK_IS_BOX (box));
+
+  private = box->priv;
+
+  if (position != private->baseline_pos)
+    {
+      private->baseline_pos = position;
+
+      g_object_notify (G_OBJECT (box), "baseline-position");
+
+      gtk_widget_queue_resize (GTK_WIDGET (box));
+    }
+}
+
+/**
+ * gtk_box_get_baseline_position:
+ * @box: a #GtkBox
+ *
+ * Gets the value set by gtk_box_set_baseline_position().
+ *
+ * Return value: the baseline position
+ *
+ * Since: 3.10
+ **/
+GtkBaselinePosition
+gtk_box_get_baseline_position (GtkBox         *box)
+{
+  g_return_val_if_fail (GTK_IS_BOX (box), GTK_BASELINE_POSITION_CENTER);
+
+  return box->priv->baseline_pos;
+}
+
+
 void
 _gtk_box_set_spacing_set (GtkBox  *box,
                           gboolean spacing_set)

gtk/gtkbox.h

@@ -89,6 +89,11 @@ gboolean    gtk_box_get_homogeneous     (GtkBox         *box);
 void        gtk_box_set_spacing         (GtkBox         *box,
                                          gint            spacing);
 gint        gtk_box_get_spacing         (GtkBox         *box);
+GDK_AVAILABLE_IN_3_10
+void        gtk_box_set_baseline_position (GtkBox             *box,
+					   GtkBaselinePosition position);
+GDK_AVAILABLE_IN_3_10
+GtkBaselinePosition gtk_box_get_baseline_position (GtkBox         *box);
 
 void        gtk_box_reorder_child       (GtkBox         *box,
                                          GtkWidget      *child,

gtk/gtkbutton.c

@@ -170,6 +170,12 @@ static void gtk_button_get_preferred_width       (GtkWidget           *widget,
 static void gtk_button_get_preferred_height      (GtkWidget           *widget,
 						  gint                *minimum_size,
 						  gint                *natural_size);
+static void gtk_button_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+								    gint       width,
+								    gint      *minimum_size,
+								    gint      *natural_size,
+								    gint      *minimum_baseline,
+								    gint      *natural_baseline);
   
 static guint button_signals[LAST_SIGNAL] = { 0 };
 
@@ -196,6 +202,7 @@ gtk_button_class_init (GtkButtonClass *klass)
 
   widget_class->get_preferred_width  = gtk_button_get_preferred_width;
   widget_class->get_preferred_height = gtk_button_get_preferred_height;
+  widget_class->get_preferred_height_and_baseline_for_width = gtk_button_get_preferred_height_and_baseline_for_width;
   widget_class->destroy = gtk_button_destroy;
   widget_class->screen_changed = gtk_button_screen_changed;
   widget_class->realize = gtk_button_realize;
@@ -1150,11 +1157,16 @@ gtk_button_construct_child (GtkButton *button)
       else
 	box = gtk_box_new (GTK_ORIENTATION_VERTICAL, image_spacing);
 
+      gtk_widget_set_valign (image, GTK_ALIGN_BASELINE);
+      gtk_widget_set_valign (box, GTK_ALIGN_BASELINE);
+
       if (priv->align_set)
 	align = gtk_alignment_new (priv->xalign, priv->yalign, 0.0, 0.0);
       else
 	align = gtk_alignment_new (0.5, 0.5, 0.0, 0.0);
 
+      gtk_widget_set_valign (align, GTK_ALIGN_BASELINE);
+
       if (priv->image_position == GTK_POS_LEFT ||
 	  priv->image_position == GTK_POS_TOP)
 	gtk_box_pack_start (GTK_BOX (box), priv->image, FALSE, FALSE, 0);
@@ -1172,6 +1184,8 @@ gtk_button_construct_child (GtkButton *button)
           else
             label = gtk_label_new (label_text);
 
+	  gtk_widget_set_valign (label, GTK_ALIGN_BASELINE);
+
 	  if (priv->image_position == GTK_POS_RIGHT ||
 	      priv->image_position == GTK_POS_BOTTOM)
 	    gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 0);
@@ -1196,6 +1210,8 @@ gtk_button_construct_child (GtkButton *button)
   else
     label = gtk_label_new (priv->label_text);
 
+  gtk_widget_set_valign (label, GTK_ALIGN_BASELINE);
+
   if (priv->align_set)
     gtk_misc_set_alignment (GTK_MISC (label), priv->xalign, priv->yalign);
 
@@ -1584,6 +1600,7 @@ gtk_button_size_allocate (GtkWidget     *widget,
   GtkBorder border;
   gint focus_width;
   gint focus_pad;
+  gint baseline;
 
   context = gtk_widget_get_style_context (widget);
 
@@ -1635,6 +1652,10 @@ gtk_button_size_allocate (GtkWidget     *widget,
 	  child_allocation.height = child_allocation.height - (focus_width + focus_pad) * 2;
 	}
 
+      baseline = gtk_widget_get_allocated_baseline (widget);
+      if (baseline != -1)
+	baseline -= child_allocation.y - allocation->y;
+
       if (priv->depressed)
 	{
 	  gint child_displacement_x;
@@ -1651,7 +1672,7 @@ gtk_button_size_allocate (GtkWidget     *widget,
       child_allocation.width  = MAX (1, child_allocation.width);
       child_allocation.height = MAX (1, child_allocation.height);
 
-      gtk_widget_size_allocate (child, &child_allocation);
+      gtk_widget_size_allocate_with_baseline (child, &child_allocation, baseline);
     }
 }
 
@@ -2063,7 +2084,9 @@ static void
 gtk_button_get_size (GtkWidget      *widget,
 		     GtkOrientation  orientation,
 		     gint           *minimum_size,
-		     gint           *natural_size)
+		     gint           *natural_size,
+		     gint           *minimum_baseline,
+		     gint           *natural_baseline)
 {
   GtkButton *button = GTK_BUTTON (widget);
   GtkStyleContext *context;
@@ -2074,6 +2097,7 @@ gtk_button_get_size (GtkWidget      *widget,
   gint focus_width;
   gint focus_pad;
   gint minimum, natural;
+  gint top_offset;
 
   context = gtk_widget_get_style_context (widget);
 
@@ -2084,6 +2108,8 @@ gtk_button_get_size (GtkWidget      *widget,
                                "focus-padding", &focus_pad,
                                NULL);
 
+  top_offset = 0;
+
   if (orientation == GTK_ORIENTATION_HORIZONTAL)
     {
       minimum = padding.left + padding.right +
@@ -2097,9 +2123,14 @@ gtk_button_get_size (GtkWidget      *widget,
       minimum = padding.top + padding.bottom +
         border.top + border.bottom;
 
+      top_offset = padding.top + border.top + focus_width + focus_pad;
+
       if (gtk_widget_get_can_default (GTK_WIDGET (widget)))
-	minimum += default_border.top + default_border.bottom;
-    }  
+	{
+	  minimum += default_border.top + default_border.bottom;
+	  top_offset += default_border.top;
+	}
+    }
 
   minimum += 2 * (focus_width + focus_pad);
   natural = minimum;
@@ -2108,11 +2139,17 @@ gtk_button_get_size (GtkWidget      *widget,
       gtk_widget_get_visible (child))
     {
       gint child_min, child_nat;
+      gint child_min_baseline = -1, child_nat_baseline = -1;
 
       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 	gtk_widget_get_preferred_width (child, &child_min, &child_nat);
       else
-	gtk_widget_get_preferred_height (child, &child_min, &child_nat);
+	gtk_widget_get_preferred_height_and_baseline_for_width (child, -1, &child_min, &child_nat, &child_min_baseline, &child_nat_baseline);
+
+      if (minimum_baseline && child_min_baseline >= 0)
+	*minimum_baseline = child_min_baseline + top_offset;
+      if (natural_baseline && child_nat_baseline >= 0)
+	*natural_baseline = child_nat_baseline + top_offset;
 
       minimum += child_min;
       natural += child_nat;
@@ -2130,7 +2167,7 @@ gtk_button_get_preferred_width (GtkWidget *widget,
                                 gint      *minimum_size,
                                 gint      *natural_size)
 {
-  gtk_button_get_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
+  gtk_button_get_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size, NULL, NULL);
 }
 
 static void 
@@ -2138,7 +2175,20 @@ gtk_button_get_preferred_height (GtkWidget *widget,
                                  gint      *minimum_size,
                                  gint      *natural_size)
 {
-  gtk_button_get_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
+  gtk_button_get_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size, NULL, NULL);
+}
+
+static void
+gtk_button_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+							gint       width,
+							gint      *minimum_size,
+							gint      *natural_size,
+							gint      *minimum_baseline,
+							gint      *natural_baseline)
+{
+  /* GtkButton is GTK_SIZE_REQUEST_CONSTANT mode, so width will be -1 all the time */
+  g_assert (width == -1);
+  gtk_button_get_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size, minimum_baseline, natural_baseline);
 }
 
 /**

gtk/gtkbuttonprivate.h

@@ -39,6 +39,9 @@ struct _GtkButtonPrivate
   gfloat                 xalign;
   gfloat                 yalign;
 
+  /* This is only used by checkbox and subclasses */
+  gfloat                 baseline_align;
+
   guint                  activate_timeout;
   guint32                grab_time;
 

gtk/gtkcheckbutton.c

@@ -58,6 +58,12 @@ static void gtk_check_button_get_preferred_width  (GtkWidget          *widget,
 static void gtk_check_button_get_preferred_height (GtkWidget          *widget,
                                                    gint               *minimum,
                                                    gint               *natural);
+static void gtk_check_button_get_preferred_height_and_baseline_for_width (GtkWidget          *widget,
+									  gint                width,
+									  gint               *minimum,
+									  gint               *natural,
+									  gint               *minimum_baseline,
+									  gint               *natural_baseline);
 static void gtk_check_button_size_allocate       (GtkWidget           *widget,
 						  GtkAllocation       *allocation);
 static gboolean gtk_check_button_draw            (GtkWidget           *widget,
@@ -80,6 +86,7 @@ gtk_check_button_class_init (GtkCheckButtonClass *class)
 
   widget_class->get_preferred_width = gtk_check_button_get_preferred_width;
   widget_class->get_preferred_height = gtk_check_button_get_preferred_height;
+  widget_class->get_preferred_height_and_baseline_for_width = gtk_check_button_get_preferred_height_and_baseline_for_width;
   widget_class->size_allocate = gtk_check_button_size_allocate;
   widget_class->draw = gtk_check_button_draw;
 
@@ -287,9 +294,12 @@ gtk_check_button_get_preferred_width (GtkWidget *widget,
 }
 
 static void
-gtk_check_button_get_preferred_height (GtkWidget *widget,
-                                       gint      *minimum,
-                                       gint      *natural)
+gtk_check_button_get_preferred_height_and_baseline_for_width (GtkWidget          *widget,
+							      gint                width,
+							      gint               *minimum,
+							      gint               *natural,
+							      gint               *minimum_baseline,
+							      gint               *natural_baseline)
 {
   GtkToggleButton *toggle_button = GTK_TOGGLE_BUTTON (widget);
 
@@ -301,6 +311,7 @@ gtk_check_button_get_preferred_height (GtkWidget *widget,
       gint indicator_spacing;
       gint focus_width;
       gint focus_pad;
+      gint old_minimum, old_natural;
       guint border_width;
 
       border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
@@ -320,29 +331,61 @@ gtk_check_button_get_preferred_height (GtkWidget *widget,
       if (child && gtk_widget_get_visible (child))
         {
           gint child_min, child_nat;
+	  gint child_min_baseline = -1, child_nat_baseline = -1;
 
-          gtk_widget_get_preferred_height (child, &child_min, &child_nat);
+          gtk_widget_get_preferred_height_and_baseline_for_width (child, -1,
+								  &child_min, &child_nat,
+								  &child_min_baseline, &child_nat_baseline);
+
+	  if (minimum_baseline && child_min_baseline >= 0)
+	    *minimum_baseline = child_min_baseline + border_width;
+	  if (natural_baseline && child_nat_baseline >= 0)
+	    *natural_baseline = child_nat_baseline + border_width;
 
           *minimum += child_min;
           *natural += child_nat;
+
         }
 
+      old_minimum = *minimum;
+      old_natural = *natural;
+
       temp = indicator_size + indicator_spacing * 2;
       *minimum = MAX (*minimum, temp) + 2 * (focus_width + focus_pad);
       *natural = MAX (*natural, temp) + 2 * (focus_width + focus_pad);
+
+      if (minimum_baseline && *minimum_baseline != -1)
+	minimum_baseline += (*minimum - old_minimum) / 2;
+      if (natural_baseline && *natural_baseline != -1)
+	natural_baseline += (*natural - old_natural) / 2;
     }
   else
-    GTK_WIDGET_CLASS (gtk_check_button_parent_class)->get_preferred_height (widget, minimum, natural);
+    GTK_WIDGET_CLASS (gtk_check_button_parent_class)->get_preferred_height_and_baseline_for_width (widget, width,
+												   minimum, natural,
+												   minimum_baseline, natural_baseline);
+}
+
+static void
+gtk_check_button_get_preferred_height (GtkWidget *widget,
+                                       gint      *minimum,
+                                       gint      *natural)
+{
+  gtk_check_button_get_preferred_height_and_baseline_for_width (widget, -1,
+								minimum, natural,
+								NULL, NULL);
 }
 
 static void
 gtk_check_button_size_allocate (GtkWidget     *widget,
 				GtkAllocation *allocation)
 {
+  PangoContext *pango_context;
+  PangoFontMetrics *metrics;
   GtkCheckButton *check_button;
   GtkToggleButton *toggle_button;
   GtkButton *button;
   GtkAllocation child_allocation;
+  gint baseline;
 
   button = GTK_BUTTON (widget);
   check_button = GTK_CHECK_BUTTON (widget);
@@ -389,8 +432,21 @@ gtk_check_button_size_allocate (GtkWidget     *widget,
 	    child_allocation.x = allocation->x + allocation->width
 	      - (child_allocation.x - allocation->x + child_allocation.width);
 	  
-	  gtk_widget_size_allocate (child, &child_allocation);
+	  baseline = gtk_widget_get_allocated_baseline (widget);
+	  if (baseline != -1)
+	    baseline -= child_allocation.y - allocation->y;
+	  gtk_widget_size_allocate_with_baseline (child, &child_allocation, baseline);
 	}
+
+      pango_context = gtk_widget_get_pango_context (widget);
+      metrics = pango_context_get_metrics (pango_context,
+					   pango_context_get_font_description (pango_context),
+					   pango_context_get_language (pango_context));
+      button->priv->baseline_align =
+	(double)pango_font_metrics_get_ascent (metrics) /
+	(pango_font_metrics_get_ascent (metrics) + pango_font_metrics_get_descent (metrics));
+      pango_font_metrics_unref (metrics);
+
     }
   else
     GTK_WIDGET_CLASS (gtk_check_button_parent_class)->size_allocate (widget, allocation);
@@ -448,6 +504,7 @@ gtk_real_check_button_draw_indicator (GtkCheckButton *check_button,
   gint indicator_spacing;
   gint focus_width;
   gint focus_pad;
+  gint baseline;
   guint border_width;
   gboolean interior_focus;
   GtkAllocation allocation;
@@ -458,6 +515,7 @@ gtk_real_check_button_draw_indicator (GtkCheckButton *check_button,
   toggle_button = GTK_TOGGLE_BUTTON (check_button);
 
   gtk_widget_get_allocation (widget, &allocation);
+  baseline = gtk_widget_get_allocated_baseline (widget);
   context = gtk_widget_get_style_context (widget);
   state = gtk_widget_get_state_flags (widget);
 
@@ -472,7 +530,11 @@ gtk_real_check_button_draw_indicator (GtkCheckButton *check_button,
   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
 
   x = indicator_spacing + border_width;
-  y = (allocation.height - indicator_size) / 2;
+  if (baseline == -1)
+    y = (allocation.height - indicator_size) / 2;
+  else
+    y = CLAMP (baseline - indicator_size * button->priv->baseline_align,
+	       0, allocation.height - indicator_size);
 
   child = gtk_bin_get_child (GTK_BIN (check_button));
   if (!interior_focus || !(child && gtk_widget_get_visible (child)))

gtk/gtkcontainer.c

@@ -309,12 +309,17 @@ static void     gtk_container_adjust_size_request  (GtkWidget         *widget,
                                                     GtkOrientation     orientation,
                                                     gint              *minimum_size,
                                                     gint              *natural_size);
+static void     gtk_container_adjust_baseline_request (GtkWidget      *widget,
+						       gint           *minimum_baseline,
+						       gint           *natural_baseline);
 static void     gtk_container_adjust_size_allocation (GtkWidget       *widget,
                                                       GtkOrientation   orientation,
                                                       gint            *minimum_size,
                                                       gint            *natural_size,
                                                       gint            *allocated_pos,
                                                       gint            *allocated_size);
+static void     gtk_container_adjust_baseline_allocation (GtkWidget      *widget,
+							  gint           *baseline);
 static GtkSizeRequestMode gtk_container_get_request_mode (GtkWidget   *widget);
 
 static gchar* gtk_container_child_default_composite_name (GtkContainer *container,
@@ -444,7 +449,9 @@ gtk_container_class_init (GtkContainerClass *class)
   widget_class->focus = gtk_container_focus;
 
   widget_class->adjust_size_request = gtk_container_adjust_size_request;
+  widget_class->adjust_baseline_request = gtk_container_adjust_baseline_request;
   widget_class->adjust_size_allocation = gtk_container_adjust_size_allocation;
+  widget_class->adjust_baseline_allocation = gtk_container_adjust_baseline_allocation;
   widget_class->get_request_mode = gtk_container_get_request_mode;
 
   class->add = gtk_container_add_unimplemented;
@@ -1917,6 +1924,28 @@ gtk_container_adjust_size_request (GtkWidget         *widget,
                                      minimum_size, natural_size);
 }
 
+static void
+gtk_container_adjust_baseline_request (GtkWidget         *widget,
+				       gint              *minimum_baseline,
+				       gint              *natural_baseline)
+{
+  GtkContainer *container;
+
+  container = GTK_CONTAINER (widget);
+
+  if (GTK_CONTAINER_GET_CLASS (widget)->_handle_border_width)
+    {
+      int border_width;
+
+      border_width = container->priv->border_width;
+
+      *minimum_baseline += border_width;
+      *natural_baseline += border_width;
+    }
+
+  parent_class->adjust_baseline_request (widget, minimum_baseline, natural_baseline);
+}
+
 static void
 gtk_container_adjust_size_allocation (GtkWidget         *widget,
                                       GtkOrientation     orientation,
@@ -1952,6 +1981,27 @@ gtk_container_adjust_size_allocation (GtkWidget         *widget,
                                         allocated_size);
 }
 
+static void
+gtk_container_adjust_baseline_allocation (GtkWidget         *widget,
+					  gint              *baseline)
+{
+  GtkContainer *container;
+  int border_width;
+
+  container = GTK_CONTAINER (widget);
+
+  if (GTK_CONTAINER_GET_CLASS (widget)->_handle_border_width)
+    {
+      border_width = container->priv->border_width;
+
+      if (*baseline >= 0)
+	*baseline -= border_width;
+    }
+
+  parent_class->adjust_baseline_allocation (widget, baseline);
+}
+
+
 typedef struct {
   gint hfw;
   gint wfh;

gtk/gtkdebug.h

@@ -47,7 +47,8 @@ typedef enum {
   GTK_DEBUG_PRINTING        = 1 << 10,
   GTK_DEBUG_BUILDER         = 1 << 11,
   GTK_DEBUG_SIZE_REQUEST    = 1 << 12,
-  GTK_DEBUG_NO_CSS_CACHE    = 1 << 13
+  GTK_DEBUG_NO_CSS_CACHE    = 1 << 13,
+  GTK_DEBUG_BASELINES       = 1 << 14
 } GtkDebugFlag;
 
 #ifdef G_ENABLE_DEBUG

gtk/gtkdialog.c

@@ -787,6 +787,7 @@ gtk_dialog_add_button (GtkDialog   *dialog,
   button = gtk_button_new_from_stock (button_text);
 
   gtk_widget_set_can_default (button, TRUE);
+  gtk_widget_set_valign (button, GTK_ALIGN_BASELINE);
 
   gtk_widget_show (button);
 

gtk/gtkentry.c

@@ -367,6 +367,12 @@ static void   gtk_entry_get_preferred_width  (GtkWidget        *widget,
 static void   gtk_entry_get_preferred_height (GtkWidget        *widget,
                                               gint             *minimum,
                                               gint             *natural);
+static void  gtk_entry_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+                                                                    gint       width,
+                                                                    gint      *minimum_height,
+                                                                    gint      *natural_height,
+                                                                    gint      *minimum_baseline,
+                                                                    gint      *natural_baseline);
 static void   gtk_entry_size_allocate        (GtkWidget        *widget,
 					      GtkAllocation    *allocation);
 static void   gtk_entry_draw_frame           (GtkWidget        *widget,
@@ -682,6 +688,7 @@ gtk_entry_class_init (GtkEntryClass *class)
   widget_class->unrealize = gtk_entry_unrealize;
   widget_class->get_preferred_width = gtk_entry_get_preferred_width;
   widget_class->get_preferred_height = gtk_entry_get_preferred_height;
+  widget_class->get_preferred_height_and_baseline_for_width = gtk_entry_get_preferred_height_and_baseline_for_width;
   widget_class->size_allocate = gtk_entry_size_allocate;
   widget_class->draw = gtk_entry_draw;
   widget_class->enter_notify_event = gtk_entry_enter_notify;
@@ -3305,16 +3312,19 @@ gtk_entry_get_preferred_width (GtkWidget *widget,
 }
 
 static void
-gtk_entry_get_preferred_height (GtkWidget *widget,
-                                gint      *minimum,
-                                gint      *natural)
+gtk_entry_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+						       gint       width,
+						       gint      *minimum,
+						       gint      *natural,
+						       gint      *minimum_baseline,
+						       gint      *natural_baseline)
 {
   GtkEntry *entry = GTK_ENTRY (widget);
   GtkEntryPrivate *priv = entry->priv;
   PangoFontMetrics *metrics;
   GtkBorder borders;
   PangoContext *context;
-  gint height;
+  gint height, baseline;
   PangoLayout *layout;
 
   layout = gtk_entry_ensure_layout (entry, TRUE);
@@ -3333,8 +3343,27 @@ gtk_entry_get_preferred_height (GtkWidget *widget,
 
   height += borders.top + borders.bottom;
 
+  baseline = pango_layout_get_baseline (layout) / PANGO_SCALE;
+  baseline += borders.top;
+
   *minimum = height;
   *natural = height;
+  if (minimum_baseline)
+    *minimum_baseline = baseline;
+  if (natural_baseline)
+    *natural_baseline = baseline;
+}
+
+static void
+gtk_entry_get_preferred_height (GtkWidget *widget,
+                                gint      *minimum,
+                                gint      *natural)
+{
+  gtk_entry_get_preferred_height_and_baseline_for_width (widget,
+                                                         -1,
+                                                         minimum,
+                                                         natural,
+                                                         NULL, NULL);
 }
 
 static void
@@ -3452,13 +3481,17 @@ gtk_entry_get_frame_size (GtkEntry *entry,
   GtkAllocation allocation;
   GtkRequisition requisition;
   GtkWidget *widget = GTK_WIDGET (entry);
+  gint area_height, y_pos;
+  gint baseline;
   gint req_height;
+  GtkBorder borders;
 
   gtk_widget_get_preferred_size (widget, &requisition, NULL);
 
   req_height = requisition.height - gtk_widget_get_margin_top (widget) - gtk_widget_get_margin_bottom (widget);
 
   gtk_widget_get_allocation (widget, &allocation);
+  baseline = gtk_widget_get_allocated_baseline (widget);
 
   if (x)
     *x = allocation.x;
@@ -3468,7 +3501,17 @@ gtk_entry_get_frame_size (GtkEntry *entry,
       if (priv->is_cell_renderer)
         *y = 0;
       else
-        *y = (allocation.height - req_height) / 2;
+        {
+          if (baseline == -1)
+            *y = (allocation.height - req_height) / 2;
+          else
+            {
+              _gtk_entry_get_borders (entry, &borders);
+              area_height = req_height - borders.top - borders.bottom;
+              y_pos = ((area_height * PANGO_SCALE - priv->ascent - priv->descent) / 2 + priv->ascent) / PANGO_SCALE;
+              *y = baseline - y_pos - borders.top;
+            }
+        }
 
       *y += allocation.y;
     }

gtk/gtkenums.h

@@ -51,6 +51,7 @@ G_BEGIN_DECLS
  *     or top
  * @GTK_ALIGN_CENTER: center natural width of widget inside the
  *     allocation
+ * @GTK_ALIGN_BASELINE: align the widget according to the baseline. Since 3.10.
  *
  * Controls how a widget deals with extra space in a single (x or y)
  * dimension.
@@ -64,13 +65,18 @@ G_BEGIN_DECLS
  *
  * Note that in horizontal context @GTK_ALIGN_START and @GTK_ALIGN_END
  * are interpreted relative to text direction.
+ *
+ * GTK_ALIGN_BASELINE support for it is optional for containers and widgets, and
+ * it is only supported for vertical alignment.  When its not supported by
+ * a child or a container it is treated as @GTK_ALIGN_FILL.
  */
 typedef enum
 {
   GTK_ALIGN_FILL,
   GTK_ALIGN_START,
   GTK_ALIGN_END,
-  GTK_ALIGN_CENTER
+  GTK_ALIGN_CENTER,
+  GTK_ALIGN_BASELINE
 } GtkAlign;
 
 
@@ -125,6 +131,28 @@ typedef enum
   GTK_FILL   = 1 << 2
 } GtkAttachOptions;
 
+/**
+ * GtkBaselinePosition:
+ * @GTK_BASELINE_POSITION_TOP: Align the baseline at the top
+ * @GTK_BASELINE_POSITION_CENTER: Center the baseline
+ * @GTK_BASELINE_POSITION_BOTTOM: Align the baseline at the bottom
+ *
+ * Whenever a container has some form of natural row it may align
+ * children in that row along a common typographical baseline. If
+ * the amount of verical space in the row is taller than the total
+ * requested height of the baseline-aligned children then it can use a
+ * #GtkBaselinePosition to select where to put the baseline inside the
+ * extra availible space.
+ *
+ * Since: 3.10
+ */
+typedef enum
+{
+  GTK_BASELINE_POSITION_TOP,
+  GTK_BASELINE_POSITION_CENTER,
+  GTK_BASELINE_POSITION_BOTTOM
+} GtkBaselinePosition;
+
 /**
  * GtkButtonBoxStyle:
  * @GTK_BUTTONBOX_DEFAULT_STYLE: Default packing.

gtk/gtkeventbox.c

@@ -65,6 +65,12 @@ static void     gtk_event_box_get_preferred_width  (GtkWidget *widget,
 static void     gtk_event_box_get_preferred_height (GtkWidget *widget,
                                                     gint      *minimum,
                                                     gint      *natural);
+static void     gtk_event_box_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+									   gint       width,
+									   gint      *minimum,
+									   gint      *natural,
+									   gint      *minimum_baseline,
+									   gint      *natural_baseline);
 static void     gtk_event_box_size_allocate (GtkWidget        *widget,
                                              GtkAllocation    *allocation);
 static gboolean gtk_event_box_draw          (GtkWidget        *widget,
@@ -96,6 +102,7 @@ gtk_event_box_class_init (GtkEventBoxClass *class)
   widget_class->unmap = gtk_event_box_unmap;
   widget_class->get_preferred_width = gtk_event_box_get_preferred_width;
   widget_class->get_preferred_height = gtk_event_box_get_preferred_height;
+  widget_class->get_preferred_height_and_baseline_for_width = gtk_event_box_get_preferred_height_and_baseline_for_width;
   widget_class->size_allocate = gtk_event_box_size_allocate;
   widget_class->draw = gtk_event_box_draw;
 
@@ -515,9 +522,12 @@ gtk_event_box_get_preferred_width (GtkWidget *widget,
 }
 
 static void
-gtk_event_box_get_preferred_height (GtkWidget *widget,
-                                    gint      *minimum,
-                                    gint      *natural)
+gtk_event_box_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+							   gint       width,
+							   gint      *minimum,
+							   gint      *natural,
+							   gint      *minimum_baseline,
+							   gint      *natural_baseline)
 {
   GtkBin *bin = GTK_BIN (widget);
   GtkWidget *child;
@@ -528,9 +538,30 @@ gtk_event_box_get_preferred_height (GtkWidget *widget,
   if (natural)
     *natural = 0;
 
+  if (minimum_baseline)
+    *minimum_baseline = -1;
+
+  if (natural_baseline)
+    *natural_baseline = -1;
+
   child = gtk_bin_get_child (bin);
   if (child && gtk_widget_get_visible (child))
-    gtk_widget_get_preferred_height (child, minimum, natural);
+    gtk_widget_get_preferred_height_and_baseline_for_width (child,
+							    -1,
+							    minimum,
+							    natural,
+							    minimum_baseline,
+							    natural_baseline);
+}
+
+static void
+gtk_event_box_get_preferred_height (GtkWidget *widget,
+                                    gint      *minimum,
+                                    gint      *natural)
+{
+  gtk_event_box_get_preferred_height_and_baseline_for_width (widget, -1,
+							     minimum, natural,
+							     NULL, NULL);
 }
 
 static void
@@ -539,6 +570,7 @@ gtk_event_box_size_allocate (GtkWidget     *widget,
 {
   GtkBin *bin;
   GtkAllocation child_allocation;
+  gint baseline;
   GtkEventBoxPrivate *priv;
   GtkWidget *child;
 
@@ -578,9 +610,10 @@ gtk_event_box_size_allocate (GtkWidget     *widget,
                                 child_allocation.height);
     }
 
+  baseline = gtk_widget_get_allocated_baseline (widget);
   child = gtk_bin_get_child (bin);
   if (child)
-    gtk_widget_size_allocate (child, &child_allocation);
+    gtk_widget_size_allocate_with_baseline (child, &child_allocation, baseline);
 }
 
 static gboolean

gtk/gtkgrid.h

@@ -109,6 +109,18 @@ gboolean   gtk_grid_get_column_homogeneous (GtkGrid         *grid);
 void       gtk_grid_set_column_spacing     (GtkGrid         *grid,
                                             guint            spacing);
 guint      gtk_grid_get_column_spacing     (GtkGrid         *grid);
+GDK_AVAILABLE_IN_3_10
+void       gtk_grid_set_row_baseline_position (GtkGrid      *grid,
+					       gint          row,
+					       GtkBaselinePosition pos);
+GDK_AVAILABLE_IN_3_10
+GtkBaselinePosition gtk_grid_get_row_baseline_position (GtkGrid      *grid,
+							gint          row);
+GDK_AVAILABLE_IN_3_10
+void       gtk_grid_set_baseline_row       (GtkGrid         *grid,
+					    gint             row);
+GDK_AVAILABLE_IN_3_10
+gint       gtk_grid_get_baseline_row       (GtkGrid         *grid);
 
 
 G_END_DECLS

gtk/gtkimage.c

@@ -140,6 +140,8 @@ struct _GtkImagePrivate
 
   gchar                *filename;       /* Only used with GTK_IMAGE_ANIMATION, GTK_IMAGE_PIXBUF */
   gchar                *resource_path;  /* Only used with GTK_IMAGE_PIXBUF */
+
+  float baseline_align;
 };
 
 
@@ -154,6 +156,12 @@ static void gtk_image_get_preferred_width  (GtkWidget    *widget,
 static void gtk_image_get_preferred_height (GtkWidget    *widget,
                                             gint         *minimum,
                                             gint         *natural);
+static void gtk_image_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+								   gint       width,
+								   gint      *minimum,
+								   gint      *natural,
+								   gint      *minimum_baseline,
+								   gint      *natural_baseline);
 
 static void gtk_image_style_updated        (GtkWidget    *widget);
 static void gtk_image_screen_changed       (GtkWidget    *widget,
@@ -207,6 +215,7 @@ gtk_image_class_init (GtkImageClass *class)
   widget_class->draw = gtk_image_draw;
   widget_class->get_preferred_width = gtk_image_get_preferred_width;
   widget_class->get_preferred_height = gtk_image_get_preferred_height;
+  widget_class->get_preferred_height_and_baseline_for_width = gtk_image_get_preferred_height_and_baseline_for_width;
   widget_class->unmap = gtk_image_unmap;
   widget_class->unrealize = gtk_image_unrealize;
   widget_class->style_updated = gtk_image_style_updated;
@@ -1393,6 +1402,26 @@ gtk_image_get_preferred_size (GtkImage *image,
     *height_out = height;
 }
 
+static float
+gtk_image_get_baseline_align (GtkImage *image)
+{
+  PangoContext *pango_context;
+  PangoFontMetrics *metrics;
+
+  if (image->priv->baseline_align == 0.0)
+    {
+      pango_context = gtk_widget_get_pango_context (GTK_WIDGET (image));
+      metrics = pango_context_get_metrics (pango_context,
+					   pango_context_get_font_description (pango_context),
+					   pango_context_get_language (pango_context));
+      image->priv->baseline_align =
+	(float)pango_font_metrics_get_ascent (metrics) /
+	(pango_font_metrics_get_ascent (metrics) + pango_font_metrics_get_descent (metrics));
+    }
+
+  return image->priv->baseline_align;
+}
+
 static gint
 gtk_image_draw (GtkWidget *widget,
                 cairo_t   *cr)
@@ -1401,7 +1430,7 @@ gtk_image_draw (GtkWidget *widget,
   GtkImagePrivate *priv;
   GtkMisc *misc;
   GtkStyleContext *context;
-  gint x, y, width, height;
+  gint x, y, width, height, baseline;
   gfloat xalign, yalign;
   GtkBorder border;
 
@@ -1427,8 +1456,14 @@ gtk_image_draw (GtkWidget *widget,
   if (gtk_widget_get_direction (widget) != GTK_TEXT_DIR_LTR)
     xalign = 1.0 - xalign;
 
+  baseline = gtk_widget_get_allocated_baseline (widget);
+
   x = floor ((gtk_widget_get_allocated_width (widget) - width) * xalign) + border.left;
-  y = floor ((gtk_widget_get_allocated_height (widget) - height) * yalign) + border.top;
+  if (baseline == -1)
+    y = floor ((gtk_widget_get_allocated_height (widget) - height) * yalign) + border.top;
+  else
+    y = CLAMP (baseline - height * gtk_image_get_baseline_align (image),
+	       border.top, gtk_widget_get_allocated_height (widget) - height);
 
   if (gtk_image_get_storage_type (image) == GTK_IMAGE_ANIMATION)
     {
@@ -1535,15 +1570,37 @@ gtk_image_get_preferred_width (GtkWidget *widget,
   *minimum = *natural = width;
 } 
 
+static void
+gtk_image_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+						       gint       width,
+						       gint      *minimum,
+						       gint      *natural,
+						       gint      *minimum_baseline,
+						       gint      *natural_baseline)
+{
+  gint height;
+  float baseline_align;
+
+  gtk_image_get_preferred_size (GTK_IMAGE (widget), NULL, &height);
+  *minimum = *natural = height;
+
+  if (minimum_baseline || natural_baseline)
+    {
+      baseline_align = gtk_image_get_baseline_align (GTK_IMAGE (widget));
+      if (minimum_baseline)
+	*minimum_baseline = height * baseline_align;
+      if (natural_baseline)
+	*natural_baseline = height * baseline_align;
+    }
+}
+
 static void
 gtk_image_get_preferred_height (GtkWidget *widget,
                                 gint      *minimum,
                                 gint      *natural)
 {
-  gint height;
-
-  gtk_image_get_preferred_size (GTK_IMAGE (widget), NULL, &height);
-  *minimum = *natural = height;
+  gtk_image_get_preferred_height_and_baseline_for_width (widget, -1, minimum, natural,
+							 NULL, NULL);
 }
 
 static void
@@ -1558,9 +1615,13 @@ icon_theme_changed (GtkImage *image)
 static void
 gtk_image_style_updated (GtkWidget *widget)
 {
+  GtkImage *image = GTK_IMAGE (widget);
+  GtkImagePrivate *priv = image->priv;
+
   GTK_WIDGET_CLASS (gtk_image_parent_class)->style_updated (widget);
 
-  icon_theme_changed (GTK_IMAGE (widget));
+  icon_theme_changed (image);
+  priv->baseline_align = 0.0;
 }
 
 static void

gtk/gtklabel.c

@@ -519,6 +519,12 @@ static void               gtk_label_get_preferred_height_for_width  (GtkWidget
                                                                      gint                 width,
                                                                      gint                *minimum_height,
                                                                      gint                *natural_height);
+static void    gtk_label_get_preferred_height_and_baseline_for_width (GtkWidget          *widget,
+								      gint                width,
+								      gint               *minimum_height,
+								      gint               *natural_height,
+								      gint               *minimum_baseline,
+								      gint               *natural_baseline);
 
 static GtkBuildableIface *buildable_parent_iface = NULL;
 
@@ -585,6 +591,7 @@ gtk_label_class_init (GtkLabelClass *class)
   widget_class->get_preferred_height = gtk_label_get_preferred_height;
   widget_class->get_preferred_width_for_height = gtk_label_get_preferred_width_for_height;
   widget_class->get_preferred_height_for_width = gtk_label_get_preferred_height_for_width;
+  widget_class->get_preferred_height_and_baseline_for_width = gtk_label_get_preferred_height_and_baseline_for_width;
 
   class->move_cursor = gtk_label_move_cursor;
   class->copy_clipboard = gtk_label_copy_clipboard;
@@ -3462,15 +3469,18 @@ gtk_label_get_request_mode (GtkWidget *widget)
     return GTK_SIZE_REQUEST_CONSTANT_SIZE;
 }
 
+
 static void
 get_size_for_allocation (GtkLabel        *label,
                          GtkOrientation   orientation,
                          gint             allocation,
                          gint            *minimum_size,
-                         gint            *natural_size)
+                         gint            *natural_size,
+			 gint            *minimum_baseline,
+                         gint            *natural_baseline)
 {
   PangoLayout *layout;
-  gint text_height;
+  gint text_height, baseline;
 
   layout = gtk_label_get_measuring_layout (label, NULL, allocation * PANGO_SCALE);
 
@@ -3482,6 +3492,16 @@ get_size_for_allocation (GtkLabel        *label,
   if (natural_size)
     *natural_size = text_height;
 
+  if (minimum_baseline || natural_baseline)
+    {
+      baseline = pango_layout_get_baseline (layout) / PANGO_SCALE;
+      if (minimum_baseline)
+	*minimum_baseline = baseline;
+
+      if (natural_baseline)
+	*natural_baseline = baseline;
+    }
+
   g_object_unref (layout);
 }
 
@@ -3578,7 +3598,9 @@ static void
 gtk_label_get_preferred_size (GtkWidget      *widget,
                               GtkOrientation  orientation,
                               gint           *minimum_size,
-                              gint           *natural_size)
+                              gint           *natural_size,
+			      gint           *minimum_baseline,
+			      gint           *natural_baseline)
 {
   GtkLabel      *label = GTK_LABEL (widget);
   GtkLabelPrivate  *priv = label->priv;
@@ -3586,6 +3608,12 @@ gtk_label_get_preferred_size (GtkWidget      *widget,
   PangoRectangle smallest_rect;
   GtkBorder border;
 
+  if (minimum_baseline)
+    *minimum_baseline = -1;
+
+  if (natural_baseline)
+    *natural_baseline = -1;
+
   gtk_label_get_preferred_layout_size (label, &smallest_rect, &widest_rect);
 
   /* Now that we have minimum and natural sizes in pango extents, apply a possible transform */
@@ -3640,7 +3668,8 @@ gtk_label_get_preferred_size (GtkWidget      *widget,
           get_size_for_allocation (label,
                                    GTK_ORIENTATION_VERTICAL,
                                    smallest_rect.height,
-                                   minimum_size, natural_size);
+                                   minimum_size, natural_size,
+				   NULL, NULL);
 
         }
       else
@@ -3667,7 +3696,16 @@ gtk_label_get_preferred_size (GtkWidget      *widget,
           get_size_for_allocation (label,
                                    GTK_ORIENTATION_HORIZONTAL,
                                    widest_rect.width,
-                                   minimum_size, natural_size);
+                                   minimum_size, natural_size,
+				   minimum_baseline, natural_baseline);
+
+	  if (priv->angle == 180)
+	    {
+	      if (minimum_baseline)
+		*minimum_baseline = *minimum_size - *minimum_baseline;
+	      if (natural_baseline)
+		*natural_baseline = *natural_size - *natural_baseline;
+	    }
         }
       else
         {
@@ -3680,6 +3718,12 @@ gtk_label_get_preferred_size (GtkWidget      *widget,
 
       *minimum_size += border.top + border.bottom;
       *natural_size += border.top + border.bottom;
+
+      if (minimum_baseline && *minimum_baseline != -1)
+	*minimum_baseline += border.top;
+
+      if (natural_baseline && *natural_baseline != -1)
+	*natural_baseline += border.top;
     }
 }
 
@@ -3688,7 +3732,7 @@ gtk_label_get_preferred_width (GtkWidget *widget,
                                gint      *minimum_size,
                                gint      *natural_size)
 {
-  gtk_label_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
+  gtk_label_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size, NULL, NULL);
 }
 
 static void
@@ -3696,7 +3740,7 @@ gtk_label_get_preferred_height (GtkWidget *widget,
                                 gint      *minimum_size,
                                 gint      *natural_size)
 {
-  gtk_label_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
+  gtk_label_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size, NULL, NULL);
 }
 
 static void
@@ -3719,7 +3763,8 @@ gtk_label_get_preferred_width_for_height (GtkWidget *widget,
 
       get_size_for_allocation (label, GTK_ORIENTATION_VERTICAL,
                                MAX (1, height - border.top - border.bottom),
-                               minimum_width, natural_width);
+                               minimum_width, natural_width,
+			       NULL, NULL);
 
       if (minimum_width)
         *minimum_width += border.right + border.left;
@@ -3732,15 +3777,17 @@ gtk_label_get_preferred_width_for_height (GtkWidget *widget,
 }
 
 static void
-gtk_label_get_preferred_height_for_width (GtkWidget *widget,
-                                          gint       width,
-                                          gint      *minimum_height,
-                                          gint      *natural_height)
+gtk_label_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+						       gint       width,
+						       gint      *minimum_height,
+						       gint      *natural_height,
+						       gint      *minimum_baseline,
+						       gint      *natural_baseline)
 {
   GtkLabel *label = GTK_LABEL (widget);
   GtkLabelPrivate *priv = label->priv;
 
-  if (priv->wrap && (priv->angle == 0 || priv->angle == 180 || priv->angle == 360))
+  if (width != -1 && priv->wrap && (priv->angle == 0 || priv->angle == 180 || priv->angle == 360))
     {
       GtkBorder border;
 
@@ -3751,7 +3798,13 @@ gtk_label_get_preferred_height_for_width (GtkWidget *widget,
 
       get_size_for_allocation (label, GTK_ORIENTATION_HORIZONTAL,
                                MAX (1, width - border.left - border.right),
-                               minimum_height, natural_height);
+                               minimum_height, natural_height,
+			       minimum_baseline, natural_baseline);
+
+      if (minimum_baseline && *minimum_baseline != -1)
+	*minimum_baseline += border.top;
+      if (natural_baseline && *natural_baseline != -1)
+	*natural_baseline += border.top;
 
       if (minimum_height)
         *minimum_height += border.top + border.bottom;
@@ -3760,7 +3813,18 @@ gtk_label_get_preferred_height_for_width (GtkWidget *widget,
         *natural_height += border.top + border.bottom;
     }
   else
-    GTK_WIDGET_GET_CLASS (widget)->get_preferred_height (widget, minimum_height, natural_height);
+    gtk_label_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, minimum_height, natural_height, minimum_baseline, natural_baseline);
+}
+
+static void
+gtk_label_get_preferred_height_for_width (GtkWidget *widget,
+                                          gint       width,
+                                          gint      *minimum_height,
+                                          gint      *natural_height)
+{
+  return gtk_label_get_preferred_height_and_baseline_for_width (widget, width,
+								minimum_height, natural_height,
+								NULL, NULL);
 }
 
 static void
@@ -3855,6 +3919,7 @@ get_layout_location (GtkLabel  *label,
   gint req_height;
   gfloat xalign, yalign;
   PangoRectangle logical;
+  gint baseline, layout_baseline, baseline_offset;
 
   misc   = GTK_MISC (label);
   widget = GTK_WIDGET (label);
@@ -3887,6 +3952,15 @@ get_layout_location (GtkLabel  *label,
 
   x = floor (allocation.x + border.left + xalign * (allocation.width - req_width) - logical.x);
 
+  baseline_offset = 0;
+  baseline = gtk_widget_get_allocated_baseline (widget);
+  if (baseline != -1 && !priv->have_transform)
+    {
+      layout_baseline = pango_layout_get_baseline (priv->layout) / PANGO_SCALE;
+      baseline_offset = baseline - layout_baseline;
+      yalign = 0.0; /* Can't support yalign while baseline aligning */
+    }
+
   /* bgo#315462 - For single-line labels, *do* align the requisition with
    * respect to the allocation, even if we are under-allocated.  For multi-line
    * labels, always show the top of the text when they are under-allocated.  The
@@ -3901,9 +3975,9 @@ get_layout_location (GtkLabel  *label,
    *   middle".  You want to read the first line, at least, to get some context.
    */
   if (pango_layout_get_line_count (priv->layout) == 1)
-    y = floor (allocation.y + border.top + (allocation.height - req_height) * yalign) - logical.y;
+    y = floor (allocation.y + border.top + (allocation.height - req_height) * yalign) - logical.y + baseline_offset;
   else
-    y = floor (allocation.y + border.top + MAX ((allocation.height - req_height) * yalign, 0)) - logical.y;
+    y = floor (allocation.y + border.top + MAX ((allocation.height - req_height) * yalign, 0)) - logical.y + baseline_offset;
 
   if (xp)
     *xp = x;

gtk/gtkmain.c

@@ -172,7 +172,8 @@ static const GDebugKey gtk_debug_keys[] = {
   {"printing", GTK_DEBUG_PRINTING},
   {"builder", GTK_DEBUG_BUILDER},
   {"size-request", GTK_DEBUG_SIZE_REQUEST},
-  {"no-css-cache", GTK_DEBUG_NO_CSS_CACHE}
+  {"no-css-cache", GTK_DEBUG_NO_CSS_CACHE},
+  {"baselines", GTK_DEBUG_BASELINES}
 };
 #endif /* G_ENABLE_DEBUG */
 

gtk/gtkradiobutton.c

@@ -903,6 +903,7 @@ gtk_radio_button_draw_indicator (GtkCheckButton *check_button,
   gint indicator_size, indicator_spacing;
   gint focus_width;
   gint focus_pad;
+  gint baseline;
   guint border_width;
   gboolean interior_focus;
 
@@ -923,9 +924,14 @@ gtk_radio_button_draw_indicator (GtkCheckButton *check_button,
   _gtk_check_button_get_props (check_button, &indicator_size, &indicator_spacing);
 
   gtk_widget_get_allocation (widget, &allocation);
+  baseline = gtk_widget_get_allocated_baseline (widget);
 
   x = indicator_spacing + border_width;
-  y = (allocation.height - indicator_size) / 2;
+  if (baseline == -1)
+    y = (allocation.height - indicator_size) / 2;
+  else
+    y = CLAMP (baseline - indicator_size * button->priv->baseline_align,
+	       0, allocation.height - indicator_size);
 
   child = gtk_bin_get_child (GTK_BIN (check_button));
   if (!interior_focus || !(child && gtk_widget_get_visible (child)))

gtk/gtksizerequest.c

@@ -93,16 +93,61 @@ get_vfunc_name (GtkOrientation orientation,
     return for_size < 0 ? "get_preferred_height" : "get_preferred_height_for_width";
 }
 
+static gboolean
+widget_class_has_baseline_support (GtkWidgetClass *widget_class)
+{
+  GtkWidgetClass *parent_class;
+
+  if (widget_class->get_preferred_height_and_baseline_for_width == NULL)
+    return FALSE;
+
+  /* This is kinda hacky, but for backwards compatibility reasons we have to handle the case
+     where a class previously did not support get_preferred_height_and_baseline_for_width,
+     but then gained support for it, and a subclass of it overrides the previous non-baseline
+     methods. If this happens we need to call the overridden (non-baseline supporting) versions
+     on the subclass, rather than the inherited but not overriddent new get_preferred_height_and_baseline_for_width.
+  */
+
+  /* Loop over all parent classes that inherit the same get_preferred_height_and_baseline_for_width */
+  parent_class = g_type_class_peek_parent (widget_class);
+  while (parent_class != NULL &&
+	 parent_class->get_preferred_height_and_baseline_for_width == widget_class->get_preferred_height_and_baseline_for_width)
+    {
+      if (parent_class->get_preferred_height != widget_class->get_preferred_height ||
+	  parent_class->get_preferred_height_for_width != widget_class->get_preferred_height_for_width)
+	return FALSE;
+
+	parent_class = g_type_class_peek_parent (parent_class);
+    }
+
+  return TRUE;
+}
+
+gboolean
+_gtk_widget_has_baseline_support (GtkWidget *widget)
+{
+  GtkWidgetClass *widget_class;
+
+  widget_class = GTK_WIDGET_GET_CLASS (widget);
+
+  return widget_class_has_baseline_support (widget_class);
+}
+
 static void
 gtk_widget_query_size_for_orientation (GtkWidget        *widget,
                                        GtkOrientation    orientation,
                                        gint              for_size,
                                        gint             *minimum_size,
-                                       gint             *natural_size)
+                                       gint             *natural_size,
+                                       gint             *minimum_baseline,
+                                       gint             *natural_baseline)
 {
   SizeRequestCache *cache;
+  GtkWidgetClass *widget_class;
   gint min_size = 0;
   gint nat_size = 0;
+  gint min_baseline = -1;
+  gint nat_baseline = -1;
   gboolean found_in_cache;
 
   if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_CONSTANT_SIZE)
@@ -113,7 +158,11 @@ gtk_widget_query_size_for_orientation (GtkWidget        *widget,
                                                    orientation,
                                                    for_size,
                                                    &min_size,
-                                                   &nat_size);
+                                                   &nat_size,
+						   &min_baseline,
+						   &nat_baseline);
+
+  widget_class = GTK_WIDGET_GET_CLASS (widget);
   
   if (!found_in_cache)
     {
@@ -126,7 +175,7 @@ gtk_widget_query_size_for_orientation (GtkWidget        *widget,
           if (for_size < 0)
             {
 	      push_recursion_check (widget, orientation, for_size);
-              GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, &min_size, &nat_size);
+              widget_class->get_preferred_width (widget, &min_size, &nat_size);
 	      pop_recursion_check (widget, orientation);
             }
           else
@@ -140,17 +189,17 @@ gtk_widget_query_size_for_orientation (GtkWidget        *widget,
 	      gtk_widget_get_preferred_height (widget, &minimum_height, &natural_height);
 
               /* convert for_size to unadjusted height (for_size is a proposed allocation) */
-              GTK_WIDGET_GET_CLASS (widget)->adjust_size_allocation (widget,
-                                                                     GTK_ORIENTATION_VERTICAL,
-                                                                     &minimum_height,
-								     &natural_height,
-                                                                     &ignored_position,
-                                                                     &adjusted_for_size);
+              widget_class->adjust_size_allocation (widget,
+						    GTK_ORIENTATION_VERTICAL,
+						    &minimum_height,
+						    &natural_height,
+						    &ignored_position,
+						    &adjusted_for_size);
 
 	      push_recursion_check (widget, orientation, for_size);
-              GTK_WIDGET_GET_CLASS (widget)->get_preferred_width_for_height (widget, 
-									     MAX (adjusted_for_size, minimum_height),
-									     &min_size, &nat_size);
+              widget_class->get_preferred_width_for_height (widget,
+							    MAX (adjusted_for_size, minimum_height),
+							    &min_size, &nat_size);
 	      pop_recursion_check (widget, orientation);
             }
         }
@@ -159,7 +208,12 @@ gtk_widget_query_size_for_orientation (GtkWidget        *widget,
           if (for_size < 0)
             {
 	      push_recursion_check (widget, orientation, for_size);
-              GTK_WIDGET_GET_CLASS (widget)->get_preferred_height (widget, &min_size, &nat_size);
+	      if (widget_class_has_baseline_support (widget_class))
+		widget_class->get_preferred_height_and_baseline_for_width (widget, -1,
+									   &min_size, &nat_size,
+									   &min_baseline, &nat_baseline);
+	      else
+		widget_class->get_preferred_height (widget, &min_size, &nat_size);
 	      pop_recursion_check (widget, orientation);
             }
           else
@@ -173,17 +227,21 @@ gtk_widget_query_size_for_orientation (GtkWidget        *widget,
 	      gtk_widget_get_preferred_width (widget, &minimum_width, &natural_width);
 
               /* convert for_size to unadjusted width (for_size is a proposed allocation) */
-              GTK_WIDGET_GET_CLASS (widget)->adjust_size_allocation (widget,
-                                                                     GTK_ORIENTATION_HORIZONTAL,
-								     &minimum_width,
-                                                                     &natural_width,
-                                                                     &ignored_position,
-                                                                     &adjusted_for_size);
+              widget_class->adjust_size_allocation (widget,
+						    GTK_ORIENTATION_HORIZONTAL,
+						    &minimum_width,
+						    &natural_width,
+						    &ignored_position,
+						    &adjusted_for_size);
 
 	      push_recursion_check (widget, orientation, for_size);
-              GTK_WIDGET_GET_CLASS (widget)->get_preferred_height_for_width (widget, 
-									     MAX (adjusted_for_size, minimum_width),
-									     &min_size, &nat_size);
+	      if (widget_class_has_baseline_support (widget_class))
+		widget_class->get_preferred_height_and_baseline_for_width (widget, MAX (adjusted_for_size, minimum_width),
+									   &min_size, &nat_size,
+									   &min_baseline, &nat_baseline);
+	      else
+		widget_class->get_preferred_height_for_width (widget, MAX (adjusted_for_size, minimum_width),
+							      &min_size, &nat_size);
 	      pop_recursion_check (widget, orientation);
             }
         }
@@ -196,10 +254,10 @@ gtk_widget_query_size_for_orientation (GtkWidget        *widget,
 
       adjusted_min     = min_size;
       adjusted_natural = nat_size;
-      GTK_WIDGET_GET_CLASS (widget)->adjust_size_request (widget,
-                                                          orientation,
-                                                          &adjusted_min,
-                                                          &adjusted_natural);
+      widget_class->adjust_size_request (widget,
+					 orientation,
+					 &adjusted_min,
+					 &adjusted_natural);
 
       if (adjusted_min < min_size ||
           adjusted_natural < nat_size)
@@ -227,11 +285,42 @@ gtk_widget_query_size_for_orientation (GtkWidget        *widget,
           nat_size = adjusted_natural;
         }
 
+      if (min_baseline != -1 || nat_baseline != -1)
+	{
+	  if (orientation == GTK_ORIENTATION_HORIZONTAL)
+	    {
+	      g_warning ("%s %p reported a horizontal baseline",
+			 G_OBJECT_TYPE_NAME (widget), widget);
+	      min_baseline = -1;
+	      nat_baseline = -1;
+	    }
+	  else if (min_baseline == -1 || nat_baseline == -1)
+	    {
+	      g_warning ("%s %p reported baseline for only one of min/natural (min: %d, natural: %d)",
+			 G_OBJECT_TYPE_NAME (widget), widget,
+			 min_baseline, nat_baseline);
+	      min_baseline = -1;
+	      nat_baseline = -1;
+	    }
+	  else if (gtk_widget_get_valign_with_baseline (widget) != GTK_ALIGN_BASELINE)
+	    {
+	      /* Ignore requested baseline for non-aligned widgets */
+	      min_baseline = -1;
+	      nat_baseline = -1;
+	    }
+	  else
+	    widget_class->adjust_baseline_request (widget,
+						   &min_baseline,
+						   &nat_baseline);
+	}
+
       _gtk_size_request_cache_commit (cache,
                                       orientation,
                                       for_size,
                                       min_size,
-                                      nat_size);
+                                      nat_size,
+				      min_baseline,
+				      nat_baseline);
     }
 
   if (minimum_size)
@@ -240,15 +329,26 @@ gtk_widget_query_size_for_orientation (GtkWidget        *widget,
   if (natural_size)
     *natural_size = nat_size;
 
+  if (minimum_baseline)
+    *minimum_baseline = min_baseline;
+
+  if (natural_baseline)
+    *natural_baseline = nat_baseline;
+
   g_assert (min_size <= nat_size);
 
   GTK_NOTE (SIZE_REQUEST,
-            g_print ("[%p] %s\t%s: %d is minimum %d and natural: %d (hit cache: %s)\n",
+            g_print ("[%p] %s\t%s: %d is minimum %d and natural: %d",
                      widget, G_OBJECT_TYPE_NAME (widget),
                      orientation == GTK_ORIENTATION_HORIZONTAL ?
                      "width for height" : "height for width" ,
-                     for_size, min_size, nat_size,
-                     found_in_cache ? "yes" : "no"));
+                     for_size, min_size, nat_size);
+	    if (min_baseline != -1 || nat_baseline != -1)
+	      g_print (", baseline %d/%d",
+		       min_baseline, nat_baseline);
+	    g_print (" (hit cache: %s)\n",
+		     found_in_cache ? "yes" : "no")
+	    );
 }
 
 /* This is the main function that checks for a cached size and
@@ -261,7 +361,9 @@ _gtk_widget_compute_size_for_orientation (GtkWidget        *widget,
                                           GtkOrientation    orientation,
                                           gint              for_size,
                                           gint             *minimum,
-                                          gint             *natural)
+                                          gint             *natural,
+					  gint             *minimum_baseline,
+					  gint             *natural_baseline)
 {
   GHashTable *widgets;
   GHashTableIter iter;
@@ -274,12 +376,17 @@ _gtk_widget_compute_size_for_orientation (GtkWidget        *widget,
         *minimum = 0;
       if (natural)
         *natural = 0;
+      if (minimum_baseline)
+        *minimum_baseline = -1;
+      if (natural_baseline)
+        *natural_baseline = -1;
       return;
     }
 
   if (G_LIKELY (!_gtk_widget_get_sizegroups (widget)))
     {
-      gtk_widget_query_size_for_orientation (widget, orientation, for_size, minimum, natural);
+      gtk_widget_query_size_for_orientation (widget, orientation, for_size, minimum, natural,
+					     minimum_baseline, natural_baseline);
       return;
     }
 
@@ -293,7 +400,7 @@ _gtk_widget_compute_size_for_orientation (GtkWidget        *widget,
       GtkWidget *tmp_widget = key;
       gint min_dimension, nat_dimension;
 
-      gtk_widget_query_size_for_orientation (tmp_widget, orientation, for_size, &min_dimension, &nat_dimension);
+      gtk_widget_query_size_for_orientation (tmp_widget, orientation, for_size, &min_dimension, &nat_dimension, NULL, NULL);
 
       min_result = MAX (min_result, min_dimension);
       nat_result = MAX (nat_result, nat_dimension);
@@ -303,6 +410,13 @@ _gtk_widget_compute_size_for_orientation (GtkWidget        *widget,
 
   g_hash_table_destroy (widgets);
 
+  /* Baselines make no sense with sizegroups really */
+  if (minimum_baseline)
+    *minimum_baseline = -1;
+
+  if (natural_baseline)
+    *natural_baseline = -1;
+
   if (minimum)
     *minimum = min_result;
 
@@ -375,7 +489,8 @@ gtk_widget_get_preferred_width (GtkWidget *widget,
                                             GTK_ORIENTATION_HORIZONTAL,
                                             -1,
                                             minimum_width,
-                                            natural_width);
+                                            natural_width,
+					    NULL, NULL);
 }
 
 
@@ -409,7 +524,8 @@ gtk_widget_get_preferred_height (GtkWidget *widget,
                                             GTK_ORIENTATION_VERTICAL,
                                             -1,
                                             minimum_height,
-                                            natural_height);
+                                            natural_height,
+					    NULL, NULL);
 }
 
 
@@ -446,7 +562,8 @@ gtk_widget_get_preferred_width_for_height (GtkWidget *widget,
                                             GTK_ORIENTATION_HORIZONTAL,
                                             height,
                                             minimum_width,
-                                            natural_width);
+                                            natural_width,
+					    NULL, NULL);
 }
 
 /**
@@ -481,7 +598,122 @@ gtk_widget_get_preferred_height_for_width (GtkWidget *widget,
                                             GTK_ORIENTATION_VERTICAL,
                                             width,
                                             minimum_height,
-                                            natural_height);
+                                            natural_height,
+					    NULL, NULL);
+}
+
+/**
+ * gtk_widget_get_preferred_height_and_baseline_for_width:
+ * @widget: a #GtkWidget instance
+ * @width: the width which is available for allocation, or -1 if none
+ * @minimum_height: (out) (allow-none): location for storing the minimum height, or %NULL
+ * @natural_height: (out) (allow-none): location for storing the natural height, or %NULL
+ * @minimum_baseline: (out) (allow-none): location for storing the baseline for the minimum height, or %NULL
+ * @natural_baseline: (out) (allow-none): location for storing the baseline for the natural height, or %NULL
+ *
+ * Retrieves a widget's minimum and natural height and the corresponding baselines if it would be given
+ * the specified @width, or the default height if @width is -1. The baselines may be -1 which means
+ * that no baseline is requested for this widget.
+ *
+ * The returned request will be modified by the
+ * GtkWidgetClass::adjust_size_request and GtkWidgetClass::adjust_baseline_request virtual methods
+ * and by any #GtkSizeGroup<!-- -->s that have been applied. That is, the returned request
+ * is the one that should be used for layout, not necessarily the one
+ * returned by the widget itself.
+ *
+ * Since: 3.10
+ */
+void
+gtk_widget_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+							gint       width,
+							gint      *minimum_height,
+							gint      *natural_height,
+							gint      *minimum_baseline,
+							gint      *natural_baseline)
+{
+  g_return_if_fail (GTK_IS_WIDGET (widget));
+  g_return_if_fail (minimum_height != NULL || natural_height != NULL);
+  g_return_if_fail (width >= -1);
+
+  _gtk_widget_compute_size_for_orientation (widget,
+                                            GTK_ORIENTATION_VERTICAL,
+                                            width,
+                                            minimum_height,
+                                            natural_height,
+					    minimum_baseline,
+					    natural_baseline);
+}
+
+/**
+ * gtk_widget_get_preferred_size_and_baseline:
+ * @widget: a #GtkWidget instance
+ * @minimum_size: (out) (allow-none): location for storing the minimum size, or %NULL
+ * @natural_size: (out) (allow-none): location for storing the natural size, or %NULL
+ *
+ * Retrieves the minimum and natural size  and the corresponding baselines of a widget, taking
+ * into account the widget's preference for height-for-width management. The baselines may
+ * be -1 which means that no baseline is requested for this widget.
+ *
+ * This is used to retrieve a suitable size by container widgets which do
+ * not impose any restrictions on the child placement. It can be used
+ * to deduce toplevel window and menu sizes as well as child widgets in
+ * free-form containers such as GtkLayout.
+ *
+ * <note><para>Handle with care. Note that the natural height of a height-for-width
+ * widget will generally be a smaller size than the minimum height, since the required
+ * height for the natural width is generally smaller than the required height for
+ * the minimum width.</para></note>
+ *
+ * Since: 3.10
+ */
+void
+gtk_widget_get_preferred_size_and_baseline (GtkWidget      *widget,
+					    GtkRequisition *minimum_size,
+					    GtkRequisition *natural_size,
+					    gint           *minimum_baseline,
+					    gint           *natural_baseline)
+{
+  gint min_width, nat_width;
+  gint min_height, nat_height;
+
+  g_return_if_fail (GTK_IS_WIDGET (widget));
+
+  if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
+    {
+      gtk_widget_get_preferred_width (widget, &min_width, &nat_width);
+
+      if (minimum_size)
+	{
+	  minimum_size->width = min_width;
+	  gtk_widget_get_preferred_height_and_baseline_for_width (widget, min_width,
+								  &minimum_size->height, NULL, minimum_baseline, NULL);
+	}
+
+      if (natural_size)
+	{
+	  natural_size->width = nat_width;
+	  gtk_widget_get_preferred_height_and_baseline_for_width (widget, nat_width,
+								  NULL, &natural_size->height, NULL, natural_baseline);
+	}
+    }
+  else /* GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT or CONSTANT_SIZE */
+    {
+      gtk_widget_get_preferred_height_and_baseline_for_width (widget, -1, &min_height, &nat_height, minimum_baseline, natural_baseline);
+
+      if (minimum_size)
+	{
+	  minimum_size->height = min_height;
+	  gtk_widget_get_preferred_width_for_height (widget, min_height,
+                                                     &minimum_size->width, NULL);
+	}
+
+      if (natural_size)
+	{
+	  natural_size->height = nat_height;
+	  gtk_widget_get_preferred_width_for_height (widget, nat_height,
+                                                     NULL, &natural_size->width);
+	}
+    }
 }
 
 /**
@@ -503,6 +735,9 @@ gtk_widget_get_preferred_height_for_width (GtkWidget *widget,
  * height for the natural width is generally smaller than the required height for
  * the minimum width.</para></note>
  *
+ * Use gtk_widget_get_preferred_size_and_baseline() if you want to support
+ * baseline alignment.
+ *
  * Since: 3.0
  */
 void
@@ -510,50 +745,10 @@ gtk_widget_get_preferred_size (GtkWidget      *widget,
                                GtkRequisition *minimum_size,
                                GtkRequisition *natural_size)
 {
-  gint min_width, nat_width;
-  gint min_height, nat_height;
-
-  g_return_if_fail (GTK_IS_WIDGET (widget));
-
-  if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
-    {
-      gtk_widget_get_preferred_width (widget, &min_width, &nat_width);
-
-      if (minimum_size)
-	{
-	  minimum_size->width = min_width;
-	  gtk_widget_get_preferred_height_for_width (widget, min_width,
-                                                     &minimum_size->height, NULL);
-	}
-
-      if (natural_size)
-	{
-	  natural_size->width = nat_width;
-	  gtk_widget_get_preferred_height_for_width (widget, nat_width,
-                                                     NULL, &natural_size->height);
-	}
-    }
-  else /* GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT or CONSTANT_SIZE */
-    {
-      gtk_widget_get_preferred_height (widget, &min_height, &nat_height);
-
-      if (minimum_size)
-	{
-	  minimum_size->height = min_height;
-	  gtk_widget_get_preferred_width_for_height (widget, min_height,
-                                                     &minimum_size->width, NULL);
-	}
-
-      if (natural_size)
-	{
-	  natural_size->height = nat_height;
-	  gtk_widget_get_preferred_width_for_height (widget, nat_height,
-                                                     NULL, &natural_size->width);
-	}
-    }
+  gtk_widget_get_preferred_size_and_baseline (widget, minimum_size, natural_size,
+					      NULL, NULL);
 }
 
-
 static gint
 compare_gap (gconstpointer p1,
 	     gconstpointer p2,

gtk/gtksizerequestcache.c

@@ -32,31 +32,38 @@ _gtk_size_request_cache_init (SizeRequestCache *cache)
 }
 
 static void
-free_sizes (SizeRequest **sizes)
+free_sizes_x (SizeRequestX **sizes)
 {
   gint i;
 
   for (i = 0; i < GTK_SIZE_REQUEST_CACHED_SIZES && sizes[i] != NULL; i++)
-    g_slice_free (SizeRequest, sizes[i]);
-      
-  g_slice_free1 (sizeof (SizeRequest *) * GTK_SIZE_REQUEST_CACHED_SIZES, sizes);
+    g_slice_free (SizeRequestX, sizes[i]);
+
+  g_slice_free1 (sizeof (SizeRequestY *) * GTK_SIZE_REQUEST_CACHED_SIZES, sizes);
+}
+
+static void
+free_sizes_y (SizeRequestY **sizes)
+{
+  gint i;
+
+  for (i = 0; i < GTK_SIZE_REQUEST_CACHED_SIZES && sizes[i] != NULL; i++)
+    g_slice_free (SizeRequestY, sizes[i]);
+
+  g_slice_free1 (sizeof (SizeRequestY *) * GTK_SIZE_REQUEST_CACHED_SIZES, sizes);
 }
 
 void
 _gtk_size_request_cache_free (SizeRequestCache *cache)
 {
-  guint i;
-
-  for (i = 0; i < 2; i++)
-    {
-      if (cache->requests[i])
-        free_sizes (cache->requests[i]);
-    }
+  if (cache->requests_x)
+    free_sizes_x (cache->requests_x);
+  if (cache->requests_x)
+    free_sizes_y (cache->requests_y);
 }
 
 void
 _gtk_size_request_cache_clear (SizeRequestCache *cache)
-                               
 {
   _gtk_size_request_cache_free (cache);
   _gtk_size_request_cache_init (cache);
@@ -67,17 +74,34 @@ _gtk_size_request_cache_commit (SizeRequestCache *cache,
                                 GtkOrientation    orientation,
                                 gint              for_size,
                                 gint              minimum_size,
-                                gint              natural_size)
+                                gint              natural_size,
+				gint              minimum_baseline,
+				gint              natural_baseline)
 {
-  SizeRequest **cached_sizes;
-  SizeRequest  *cached_size;
   guint         i, n_sizes;
 
+  if (orientation == GTK_ORIENTATION_HORIZONTAL)
+    {
+      g_assert (minimum_baseline == -1);
+      g_assert (natural_baseline == -1);
+    }
+
   /* First handle caching of the base requests */
   if (for_size < 0)
     {
-      cache->cached_size[orientation].minimum_size = minimum_size;
-      cache->cached_size[orientation].natural_size = natural_size;
+      if (orientation == GTK_ORIENTATION_HORIZONTAL)
+	{
+	  cache->cached_size_x.minimum_size = minimum_size;
+	  cache->cached_size_x.natural_size = natural_size;
+	}
+      else
+	{
+	  cache->cached_size_y.minimum_size = minimum_size;
+	  cache->cached_size_y.natural_size = natural_size;
+	  cache->cached_size_y.minimum_baseline = minimum_baseline;
+	  cache->cached_size_y.natural_baseline = natural_baseline;
+	}
+
       cache->flags[orientation].cached_size_valid = TRUE;
       return;
     }
@@ -86,45 +110,99 @@ _gtk_size_request_cache_commit (SizeRequestCache *cache,
    * in the cache and if this result can be used to extend
    * that cache entry 
    */
-  cached_sizes = cache->requests[orientation];
   n_sizes = cache->flags[orientation].n_cached_requests;
 
-  for (i = 0; i < n_sizes; i++)
-    {
-      if (cached_sizes[i]->cached_size.minimum_size == minimum_size &&
-	  cached_sizes[i]->cached_size.natural_size == natural_size)
-	{
-	  cached_sizes[i]->lower_for_size = MIN (cached_sizes[i]->lower_for_size, for_size);
-	  cached_sizes[i]->upper_for_size = MAX (cached_sizes[i]->upper_for_size, for_size);
-	  return;
-	}
-    }
 
-  /* If not found, pull a new size from the cache, the returned size cache
-   * will immediately be used to cache the new computed size so we go ahead
-   * and increment the last_cached_request right away */
-  if (n_sizes < GTK_SIZE_REQUEST_CACHED_SIZES)
+  if (orientation == GTK_ORIENTATION_HORIZONTAL)
     {
-      cache->flags[orientation].n_cached_requests++;
-      cache->flags[orientation].last_cached_request = cache->flags[orientation].n_cached_requests - 1;
+      SizeRequestX **cached_sizes;
+      SizeRequestX  *cached_size;
+      cached_sizes = cache->requests_x;
+
+      for (i = 0; i < n_sizes; i++)
+	{
+	  if (cached_sizes[i]->cached_size.minimum_size == minimum_size &&
+	      cached_sizes[i]->cached_size.natural_size == natural_size)
+	    {
+	      cached_sizes[i]->lower_for_size = MIN (cached_sizes[i]->lower_for_size, for_size);
+	      cached_sizes[i]->upper_for_size = MAX (cached_sizes[i]->upper_for_size, for_size);
+	      return;
+	    }
+	}
+
+      /* If not found, pull a new size from the cache, the returned size cache
+       * will immediately be used to cache the new computed size so we go ahead
+       * and increment the last_cached_request right away */
+      if (n_sizes < GTK_SIZE_REQUEST_CACHED_SIZES)
+	{
+	  cache->flags[orientation].n_cached_requests++;
+	  cache->flags[orientation].last_cached_request = cache->flags[orientation].n_cached_requests - 1;
+	}
+      else
+	{
+	  if (++cache->flags[orientation].last_cached_request == GTK_SIZE_REQUEST_CACHED_SIZES)
+	    cache->flags[orientation].last_cached_request = 0;
+	}
+
+      if (cache->requests_x == NULL)
+	cache->requests_x = g_slice_alloc0 (sizeof (SizeRequestX *) * GTK_SIZE_REQUEST_CACHED_SIZES);
+
+      if (cache->requests_x[cache->flags[orientation].last_cached_request] == NULL)
+	cache->requests_x[cache->flags[orientation].last_cached_request] = g_slice_new (SizeRequestX);
+
+      cached_size = cache->requests_x[cache->flags[orientation].last_cached_request];
+      cached_size->lower_for_size = for_size;
+      cached_size->upper_for_size = for_size;
+      cached_size->cached_size.minimum_size = minimum_size;
+      cached_size->cached_size.natural_size = natural_size;
     }
   else
     {
-      if (++cache->flags[orientation].last_cached_request == GTK_SIZE_REQUEST_CACHED_SIZES)
-        cache->flags[orientation].last_cached_request = 0;
+      SizeRequestY **cached_sizes;
+      SizeRequestY  *cached_size;
+      cached_sizes = cache->requests_y;
+
+      for (i = 0; i < n_sizes; i++)
+	{
+	  if (cached_sizes[i]->cached_size.minimum_size == minimum_size &&
+	      cached_sizes[i]->cached_size.natural_size == natural_size &&
+	      cached_sizes[i]->cached_size.minimum_baseline == minimum_baseline &&
+	      cached_sizes[i]->cached_size.natural_baseline == natural_baseline)
+	    {
+	      cached_sizes[i]->lower_for_size = MIN (cached_sizes[i]->lower_for_size, for_size);
+	      cached_sizes[i]->upper_for_size = MAX (cached_sizes[i]->upper_for_size, for_size);
+	      return;
+	    }
+	}
+
+      /* If not found, pull a new size from the cache, the returned size cache
+       * will immediately be used to cache the new computed size so we go ahead
+       * and increment the last_cached_request right away */
+      if (n_sizes < GTK_SIZE_REQUEST_CACHED_SIZES)
+	{
+	  cache->flags[orientation].n_cached_requests++;
+	  cache->flags[orientation].last_cached_request = cache->flags[orientation].n_cached_requests - 1;
+	}
+      else
+	{
+	  if (++cache->flags[orientation].last_cached_request == GTK_SIZE_REQUEST_CACHED_SIZES)
+	    cache->flags[orientation].last_cached_request = 0;
+	}
+
+      if (cache->requests_y == NULL)
+	cache->requests_y = g_slice_alloc0 (sizeof (SizeRequestY *) * GTK_SIZE_REQUEST_CACHED_SIZES);
+
+      if (cache->requests_y[cache->flags[orientation].last_cached_request] == NULL)
+	cache->requests_y[cache->flags[orientation].last_cached_request] = g_slice_new (SizeRequestY);
+
+      cached_size = cache->requests_y[cache->flags[orientation].last_cached_request];
+      cached_size->lower_for_size = for_size;
+      cached_size->upper_for_size = for_size;
+      cached_size->cached_size.minimum_size = minimum_size;
+      cached_size->cached_size.natural_size = natural_size;
+      cached_size->cached_size.minimum_baseline = minimum_baseline;
+      cached_size->cached_size.natural_baseline = natural_baseline;
     }
-
-  if (cache->requests[orientation] == NULL)
-    cache->requests[orientation] = g_slice_alloc0 (sizeof (SizeRequest *) * GTK_SIZE_REQUEST_CACHED_SIZES);
-
-  if (cache->requests[orientation][cache->flags[orientation].last_cached_request] == NULL)
-    cache->requests[orientation][cache->flags[orientation].last_cached_request] = g_slice_new (SizeRequest);
-
-  cached_size = cache->requests[orientation][cache->flags[orientation].last_cached_request];
-  cached_size->lower_for_size = for_size;
-  cached_size->upper_for_size = for_size;
-  cached_size->cached_size.minimum_size = minimum_size;
-  cached_size->cached_size.natural_size = natural_size;
 }
 
 /* looks for a cached size request for this for_size.
@@ -137,40 +215,85 @@ _gtk_size_request_cache_lookup (SizeRequestCache *cache,
                                 GtkOrientation    orientation,
                                 gint              for_size,
                                 gint             *minimum,
-                                gint             *natural)
+                                gint             *natural,
+				gint             *minimum_baseline,
+				gint             *natural_baseline)
 {
-  CachedSize *result = NULL;
-
-  if (for_size < 0)
+  if (orientation == GTK_ORIENTATION_HORIZONTAL)
     {
-      if (cache->flags[orientation].cached_size_valid)
-	result = &cache->cached_size[orientation];
+      CachedSizeX *result = NULL;
+
+      if (for_size < 0)
+	{
+	  if (cache->flags[orientation].cached_size_valid)
+	    result = &cache->cached_size_x;
+	}
+      else
+	{
+	  guint i;
+
+	  /* Search for an already cached size */
+	  for (i = 0; i < cache->flags[orientation].n_cached_requests; i++)
+	    {
+	      SizeRequestX *cur = cache->requests_x[i];
+
+	      if (cur->lower_for_size <= for_size &&
+		  cur->upper_for_size >= for_size)
+		{
+		  result = &cur->cached_size;
+		  break;
+		}
+	    }
+	}
+
+      if (result)
+	{
+	  *minimum = result->minimum_size;
+	  *natural = result->natural_size;
+	  *minimum_baseline = -1;
+	  *natural_baseline = -1;
+	  return TRUE;
+	}
+      else
+	return FALSE;
     }
   else
     {
-      guint i;
+      CachedSizeY *result = NULL;
 
-      /* Search for an already cached size */
-      for (i = 0; i < cache->flags[orientation].n_cached_requests; i++)
-        {
-          SizeRequest *cur = cache->requests[orientation][i];
+      if (for_size < 0)
+	{
+	  if (cache->flags[orientation].cached_size_valid)
+	    result = &cache->cached_size_y;
+	}
+      else
+	{
+	  guint i;
 
-          if (cur->lower_for_size <= for_size &&
-              cur->upper_for_size >= for_size)
-            {
-              result = &cur->cached_size;
-              break;
-            }
-        }
+	  /* Search for an already cached size */
+	  for (i = 0; i < cache->flags[orientation].n_cached_requests; i++)
+	    {
+	      SizeRequestY *cur = cache->requests_y[i];
+
+	      if (cur->lower_for_size <= for_size &&
+		  cur->upper_for_size >= for_size)
+		{
+		  result = &cur->cached_size;
+		  break;
+		}
+	    }
+	}
+
+      if (result)
+	{
+	  *minimum = result->minimum_size;
+	  *natural = result->natural_size;
+	  *minimum_baseline = result->minimum_baseline;
+	  *natural_baseline = result->natural_baseline;
+	  return TRUE;
+	}
+      else
+	return FALSE;
     }
-
-  if (result)
-    {
-      *minimum = result->minimum_size;
-      *natural = result->natural_size;
-      return TRUE;
-    }
-  else
-    return FALSE;
 }
 

gtk/gtksizerequestcacheprivate.h

@@ -41,19 +41,35 @@ G_BEGIN_DECLS
 typedef struct {
   gint minimum_size;
   gint natural_size;
-} CachedSize;
+} CachedSizeX;
+
+typedef struct {
+  gint minimum_size;
+  gint natural_size;
+  gint minimum_baseline;
+  gint natural_baseline;
+} CachedSizeY;
 
 typedef struct
 {
   gint       lower_for_size; /* The minimum for_size with the same result */
   gint       upper_for_size; /* The maximum for_size with the same result */
-  CachedSize cached_size;
-} SizeRequest;
+  CachedSizeX cached_size;
+} SizeRequestX;
+
+typedef struct
+{
+  gint       lower_for_size; /* The minimum for_size with the same result */
+  gint       upper_for_size; /* The maximum for_size with the same result */
+  CachedSizeY cached_size;
+} SizeRequestY;
 
 typedef struct {
-  SizeRequest **requests[2];
+  SizeRequestX **requests_x;
+  SizeRequestY **requests_y;
 
-  CachedSize  cached_size[2];
+  CachedSizeX  cached_size_x;
+  CachedSizeY  cached_size_y;
 
   GtkSizeRequestMode request_mode   : 3;
   guint       request_mode_valid    : 1;
@@ -72,12 +88,16 @@ void            _gtk_size_request_cache_commit                  (SizeRequestCach
                                                                  GtkOrientation          orientation,
                                                                  gint                    for_size,
                                                                  gint                    minimum_size,
-                                                                 gint                    natural_size);
+                                                                 gint                    natural_size,
+                                                                 gint                    minimum_baseline,
+                                                                 gint                    natural_baseline);
 gboolean        _gtk_size_request_cache_lookup                  (SizeRequestCache       *cache,
                                                                  GtkOrientation          orientation,
                                                                  gint                    for_size,
                                                                  gint                   *minimum,
-                                                                 gint                   *natural);
+                                                                 gint                   *natural,
+                                                                 gint                   *minimum_baseline,
+                                                                 gint                   *natural_baseline);
 
 G_END_DECLS
 

gtk/gtkspinbutton.c

@@ -222,6 +222,12 @@ static void gtk_spin_button_get_preferred_width  (GtkWidget          *widget,
 static void gtk_spin_button_get_preferred_height (GtkWidget          *widget,
                                                   gint               *minimum,
                                                   gint               *natural);
+static void gtk_spin_button_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+									 gint       width,
+									 gint      *minimum,
+									 gint      *natural,
+									 gint      *minimum_baseline,
+									 gint      *natural_baseline);
 static void gtk_spin_button_size_allocate  (GtkWidget          *widget,
                                             GtkAllocation      *allocation);
 static gint gtk_spin_button_draw           (GtkWidget          *widget,
@@ -309,6 +315,7 @@ gtk_spin_button_class_init (GtkSpinButtonClass *class)
   widget_class->unrealize = gtk_spin_button_unrealize;
   widget_class->get_preferred_width = gtk_spin_button_get_preferred_width;
   widget_class->get_preferred_height = gtk_spin_button_get_preferred_height;
+  widget_class->get_preferred_height_and_baseline_for_width = gtk_spin_button_get_preferred_height_and_baseline_for_width;
   widget_class->size_allocate = gtk_spin_button_size_allocate;
   widget_class->draw = gtk_spin_button_draw;
   widget_class->scroll_event = gtk_spin_button_scroll;
@@ -1197,14 +1204,20 @@ gtk_spin_button_get_preferred_width (GtkWidget *widget,
 }
 
 static void
-gtk_spin_button_get_preferred_height (GtkWidget *widget,
-                                      gint      *minimum,
-                                      gint      *natural)
+gtk_spin_button_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+							     gint       width,
+							     gint      *minimum,
+							     gint      *natural,
+							     gint      *minimum_baseline,
+							     gint      *natural_baseline)
 {
   GtkSpinButton *spin_button = GTK_SPIN_BUTTON (widget);
   GtkSpinButtonPrivate *priv = spin_button->priv;
 
-  GTK_WIDGET_CLASS (gtk_spin_button_parent_class)->get_preferred_height (widget, minimum, natural);
+  GTK_WIDGET_CLASS (gtk_spin_button_parent_class)->get_preferred_height_and_baseline_for_width (widget, width,
+												minimum, natural,
+												minimum_baseline,
+												natural_baseline);
 
   if (priv->orientation == GTK_ORIENTATION_VERTICAL)
     {
@@ -1216,9 +1229,22 @@ gtk_spin_button_get_preferred_height (GtkWidget *widget,
 
       *minimum += up_panel_height + down_panel_height;
       *natural += up_panel_height + down_panel_height;
+
+      if (minimum_baseline && *minimum_baseline != -1)
+	*minimum_baseline += up_panel_height;
+      if (natural_baseline && *natural_baseline != -1)
+	*natural_baseline += up_panel_height;
     }
 }
 
+static void
+gtk_spin_button_get_preferred_height (GtkWidget *widget,
+                                      gint      *minimum,
+                                      gint      *natural)
+{
+  gtk_spin_button_get_preferred_height_and_baseline_for_width (widget, -1, minimum, natural, NULL, NULL);
+}
+
 static void
 gtk_spin_button_size_allocate (GtkWidget     *widget,
                                GtkAllocation *allocation)

gtk/gtkwidget.c

@@ -95,6 +95,7 @@
  *   <listitem>#GtkWidgetClass.get_preferred_height()</listitem>
  *   <listitem>#GtkWidgetClass.get_preferred_height_for_width()</listitem>
  *   <listitem>#GtkWidgetClass.get_preferred_width_for_height()</listitem>
+ *   <listitem>#GtkWidgetClass.get_preferred_height_and_baseline_for_width()</listitem>
  * </itemizedlist>
  *
  * There are some important things to keep in mind when implementing
@@ -222,6 +223,26 @@
  * container, you <emphasis>must</emphasis> use the wrapper APIs.
  * Otherwise, you would not properly consider widget margins,
  * #GtkSizeGroup, and so forth.
+ *
+ * Since 3.10 Gtk+ also supports baseline vertical alignment of widgets. This
+ * means that widgets are positioned such that the typographical baseline of
+ * widgets in the same row are aligned. This happens if a widget supports baselines,
+ * has a vertical alignment of %GTK_ALIGN_BASELINE, and is inside a container
+ * that supports baselines and has a natural "row" that it aligns to the baseline,
+ * or a baseline assigned to it by the grandparent.
+ *
+ * Baseline alignment support for a widget is done by the #GtkWidgetClass.get_preferred_height_and_baseline_for_width()
+ * virtual function. It allows you to report a baseline in combination with the
+ * minimum and natural height. If there is no baseline you can return -1 to indicate
+ * this. The default implementation of this virtual function calls into the
+ * #GtkWidgetClass.get_preferred_height() and #GtkWidgetClass.get_preferred_height_for_width(),
+ * so if baselines are not supported it doesn't need to be implemented.
+ *
+ * If a widget ends up baseline aligned it will be allocated all the space in the parent
+ * as if it was %GTK_ALIGN_FILL, but the selected baseline can be found via gtk_widget_get_allocated_baseline().
+ * If this has a value other than -1 you need to align the widget such that the baseline
+ * appears at the position.
+ *
  * </para>
  * </refsect2>
  * <refsect2 id="style-properties">
@@ -395,6 +416,7 @@ struct _GtkWidgetPrivate
 
   /* The widget's allocated size */
   GtkAllocation allocation;
+  gint allocated_baseline;
 
   /* The widget's requested sizes */
   SizeRequestCache requests;
@@ -697,12 +719,17 @@ static void             gtk_widget_real_adjust_size_request     (GtkWidget
                                                                  GtkOrientation     orientation,
                                                                  gint              *minimum_size,
                                                                  gint              *natural_size);
+static void             gtk_widget_real_adjust_baseline_request (GtkWidget         *widget,
+								 gint              *minimum_baseline,
+								 gint              *natural_baseline);
 static void             gtk_widget_real_adjust_size_allocation  (GtkWidget         *widget,
                                                                  GtkOrientation     orientation,
                                                                  gint              *minimum_size,
                                                                  gint              *natural_size,
                                                                  gint              *allocated_pos,
                                                                  gint              *allocated_size);
+static void             gtk_widget_real_adjust_baseline_allocation (GtkWidget         *widget,
+								    gint              *baseline);
 
 static void gtk_widget_set_usize_internal (GtkWidget          *widget,
 					   gint                width,
@@ -984,6 +1011,7 @@ gtk_widget_class_init (GtkWidgetClass *klass)
   klass->get_preferred_height = gtk_widget_real_get_height;
   klass->get_preferred_width_for_height = gtk_widget_real_get_width_for_height;
   klass->get_preferred_height_for_width = gtk_widget_real_get_height_for_width;
+  klass->get_preferred_height_and_baseline_for_width = NULL;
   klass->state_changed = NULL;
   klass->state_flags_changed = gtk_widget_real_state_flags_changed;
   klass->parent_set = NULL;
@@ -1043,7 +1071,9 @@ gtk_widget_class_init (GtkWidgetClass *klass)
   klass->get_accessible = gtk_widget_real_get_accessible;
 
   klass->adjust_size_request = gtk_widget_real_adjust_size_request;
+  klass->adjust_baseline_request = gtk_widget_real_adjust_baseline_request;
   klass->adjust_size_allocation = gtk_widget_real_adjust_size_allocation;
+  klass->adjust_baseline_allocation = gtk_widget_real_adjust_baseline_allocation;
 
   g_object_class_install_property (gobject_class,
 				   PROP_NAME,
@@ -5189,22 +5219,31 @@ gtk_widget_invalidate_widget_windows (GtkWidget *widget,
 }
 
 /**
- * gtk_widget_size_allocate:
+ * gtk_widget_size_allocate_with_baseline:
  * @widget: a #GtkWidget
  * @allocation: position and size to be allocated to @widget
+ * @baseline: The baseline of the child, or -1
  *
- * This function is only used by #GtkContainer subclasses, to assign a size
- * and position to their child widgets.
+ * This function is only used by #GtkContainer subclasses, to assign a size,
+ * position and (optionally) baseline to their child widgets.
  *
- * In this function, the allocation may be adjusted. It will be forced
- * to a 1x1 minimum size, and the adjust_size_allocation virtual
- * method on the child will be used to adjust the allocation. Standard
- * adjustments include removing the widget's margins, and applying the
- * widget's #GtkWidget:halign and #GtkWidget:valign properties.
+ * In this function, the allocation and baseline may be adjusted. It
+ * will be forced to a 1x1 minimum size, and the
+ * adjust_size_allocation virtual and adjust_baseline_allocation
+ * methods on the child will be used to adjust the allocation and
+ * baseline. Standard adjustments include removing the widget's
+ * margins, and applying the widget's #GtkWidget:halign and
+ * #GtkWidget:valign properties.
+ *
+ * If the child widget does not have a valign of %GTK_ALIGN_BASELINE the
+ * baseline argument is ignored and -1 is used instead.
+ *
+ * Since: 3.10
  **/
 void
-gtk_widget_size_allocate (GtkWidget	*widget,
-			  GtkAllocation *allocation)
+gtk_widget_size_allocate_with_baseline (GtkWidget     *widget,
+					GtkAllocation *allocation,
+					gint           baseline)
 {
   GtkWidgetPrivate *priv;
   GdkRectangle real_allocation;
@@ -5212,9 +5251,11 @@ gtk_widget_size_allocate (GtkWidget	*widget,
   GdkRectangle adjusted_allocation;
   gboolean alloc_needed;
   gboolean size_changed;
+  gboolean baseline_changed;
   gboolean position_changed;
   gint natural_width, natural_height, dummy;
   gint min_width, min_height;
+  gint old_baseline;
 
   priv = widget->priv;
 
@@ -5241,17 +5282,28 @@ gtk_widget_size_allocate (GtkWidget	*widget,
 	}
 
       name = g_type_name (G_OBJECT_TYPE (G_OBJECT (widget)));
-      g_print ("gtk_widget_size_allocate: %*s%s %d %d\n",
+      g_print ("gtk_widget_size_allocate: %*s%s %d %d",
 	       2 * depth, " ", name,
 	       allocation->width, allocation->height);
+      if (baseline != -1)
+	g_print (" baseline: %d", baseline);
+      g_print ("\n");
     }
 #endif /* G_ENABLE_DEBUG */
 
+  /* Never pass a baseline to a child unless it requested it.
+     This means containers don't have to manually check for this. */
+  if (baseline != -1 &&
+      (gtk_widget_get_valign_with_baseline (widget) != GTK_ALIGN_BASELINE ||
+       !_gtk_widget_has_baseline_support (widget)))
+    baseline = -1;
+
   alloc_needed = priv->alloc_needed;
   /* Preserve request/allocate ordering */
   priv->alloc_needed = FALSE;
 
   old_allocation = priv->allocation;
+  old_baseline = priv->allocated_baseline;
   real_allocation = *allocation;
 
   adjusted_allocation = real_allocation;
@@ -5301,6 +5353,9 @@ gtk_widget_size_allocate (GtkWidget	*widget,
 							 &natural_height,
 							 &adjusted_allocation.y,
 							 &adjusted_allocation.height);
+  if (baseline >= 0)
+    GTK_WIDGET_GET_CLASS (widget)->adjust_baseline_allocation (widget,
+							       &baseline);
 
   if (adjusted_allocation.x < real_allocation.x ||
       adjusted_allocation.y < real_allocation.y ||
@@ -5330,14 +5385,16 @@ gtk_widget_size_allocate (GtkWidget	*widget,
   real_allocation.width = MAX (real_allocation.width, 1);
   real_allocation.height = MAX (real_allocation.height, 1);
 
+  baseline_changed = old_baseline != baseline;
   size_changed = (old_allocation.width != real_allocation.width ||
 		  old_allocation.height != real_allocation.height);
   position_changed = (old_allocation.x != real_allocation.x ||
 		      old_allocation.y != real_allocation.y);
 
-  if (!alloc_needed && !size_changed && !position_changed)
+  if (!alloc_needed && !size_changed && !position_changed && !baseline_changed)
     goto out;
 
+  priv->allocated_baseline = baseline;
   g_signal_emit (widget, widget_signals[SIZE_ALLOCATE], 0, &real_allocation);
 
   /* Size allocation is god... after consulting god, no further requests or allocations are needed */
@@ -5356,7 +5413,7 @@ gtk_widget_size_allocate (GtkWidget	*widget,
 	  cairo_region_destroy (invalidate);
 	}
 
-      if (size_changed)
+      if (size_changed || baseline_changed)
 	{
 	  if (priv->redraw_on_alloc)
 	    {
@@ -5371,7 +5428,7 @@ gtk_widget_size_allocate (GtkWidget	*widget,
 	}
     }
 
-  if ((size_changed || position_changed) && priv->parent &&
+  if ((size_changed || position_changed || baseline_changed) && priv->parent &&
       gtk_widget_get_realized (priv->parent) && _gtk_container_get_reallocate_redraws (GTK_CONTAINER (priv->parent)))
     {
       cairo_region_t *invalidate = cairo_region_create_rectangle (&priv->parent->priv->allocation);
@@ -5383,6 +5440,31 @@ out:
   gtk_widget_pop_verify_invariants (widget);
 }
 
+
+/**
+ * gtk_widget_size_allocate:
+ * @widget: a #GtkWidget
+ * @allocation: position and size to be allocated to @widget
+ *
+ * This function is only used by #GtkContainer subclasses, to assign a size
+ * and position to their child widgets.
+ *
+ * In this function, the allocation may be adjusted. It will be forced
+ * to a 1x1 minimum size, and the adjust_size_allocation virtual
+ * method on the child will be used to adjust the allocation. Standard
+ * adjustments include removing the widget's margins, and applying the
+ * widget's #GtkWidget:halign and #GtkWidget:valign properties.
+ *
+ * For baseline support in containers you need to use gtk_widget_size_allocate_with_baseline()
+ * instead.
+ **/
+void
+gtk_widget_size_allocate (GtkWidget	*widget,
+			  GtkAllocation *allocation)
+{
+  gtk_widget_size_allocate_with_baseline (widget, allocation, -1);
+}
+
 /**
  * gtk_widget_common_ancestor:
  * @widget_a: a #GtkWidget
@@ -5604,6 +5686,7 @@ adjust_for_align (GtkAlign  align,
 {
   switch (align)
     {
+    case GTK_ALIGN_BASELINE:
     case GTK_ALIGN_FILL:
       /* change nothing */
       break;
@@ -5674,6 +5757,18 @@ gtk_widget_real_adjust_size_allocation (GtkWidget         *widget,
     }
 }
 
+static void
+gtk_widget_real_adjust_baseline_allocation (GtkWidget         *widget,
+					    gint              *baseline)
+{
+  const GtkWidgetAuxInfo *aux_info;
+
+  aux_info = _gtk_widget_get_aux_info_or_defaults (widget);
+
+  if (baseline >= 0)
+    *baseline -= aux_info->margin.top;
+}
+
 static gboolean
 gtk_widget_real_can_activate_accel (GtkWidget *widget,
                                     guint      signal_id)
@@ -6166,6 +6261,26 @@ _gtk_widget_draw_internal (GtkWidget *widget,
                      0, cr,
                      &result);
 
+#ifdef G_ENABLE_DEBUG
+      if (G_UNLIKELY (gtk_get_debug_flags () & GTK_DEBUG_BASELINES))
+	{
+	  gint baseline = gtk_widget_get_allocated_baseline (widget);
+	  gint width = gtk_widget_get_allocated_width (widget);
+
+	  if (baseline != -1)
+	    {
+	      cairo_save (cr);
+	      cairo_new_path (cr);
+	      cairo_move_to (cr, 0, baseline+0.5);
+	      cairo_line_to (cr, width, baseline+0.5);
+	      cairo_set_line_width (cr, 1.0);
+	      cairo_set_source_rgba (cr, 1.0, 0, 0, 0.25);
+	      cairo_stroke (cr);
+	      cairo_restore (cr);
+	    }
+	}
+#endif
+
       if (cairo_status (cr) &&
           _gtk_cairo_get_event (cr))
         {
@@ -11015,6 +11130,28 @@ gtk_widget_real_adjust_size_request (GtkWidget         *widget,
     }
 }
 
+static void
+gtk_widget_real_adjust_baseline_request (GtkWidget         *widget,
+					 gint              *minimum_baseline,
+					 gint              *natural_baseline)
+{
+  const GtkWidgetAuxInfo *aux_info;
+
+  aux_info =_gtk_widget_get_aux_info_or_defaults (widget);
+
+  if (aux_info->height >= 0)
+    {
+      /* No baseline support for explicitly set height */
+      *minimum_baseline = -1;
+      *natural_baseline = -1;
+    }
+  else
+    {
+      *minimum_baseline += aux_info->margin.top;
+      *natural_baseline += aux_info->margin.top;
+    }
+}
+
 /**
  * _gtk_widget_peek_request_cache:
  *
@@ -13206,19 +13343,46 @@ gtk_widget_set_halign (GtkWidget *widget,
   g_object_notify (G_OBJECT (widget), "halign");
 }
 
+/**
+ * gtk_widget_get_valign_with_baseline:
+ * @widget: a #GtkWidget
+ *
+ * Gets the value of the #GtkWidget:valign property, including
+ * %GTK_ALIGN_BASELINE.
+ *
+ * Returns: the vertical alignment of @widget
+ *
+ * Since: 3.10
+ */
+GtkAlign
+gtk_widget_get_valign_with_baseline (GtkWidget *widget)
+{
+  g_return_val_if_fail (GTK_IS_WIDGET (widget), GTK_ALIGN_FILL);
+  return _gtk_widget_get_aux_info_or_defaults (widget)->valign;
+}
+
 /**
  * gtk_widget_get_valign:
  * @widget: a #GtkWidget
  *
  * Gets the value of the #GtkWidget:valign property.
  *
- * Returns: the vertical alignment of @widget
+ * For backwards compatibility reasons this method will never return
+ * %GTK_ALIGN_BASELINE, but instead it will convert it to
+ * %GTK_ALIGN_FILL. If your widget want to support baseline aligned
+ * children it must use gtk_widget_get_valign_with_baseline().
+ *
+ * Returns: the vertical alignment of @widget, ignoring baseline alignment
  */
 GtkAlign
 gtk_widget_get_valign (GtkWidget *widget)
 {
-  g_return_val_if_fail (GTK_IS_WIDGET (widget), GTK_ALIGN_FILL);
-  return _gtk_widget_get_aux_info_or_defaults (widget)->valign;
+  GtkAlign align;
+
+  align = gtk_widget_get_valign_with_baseline (widget);
+  if (align == GTK_ALIGN_BASELINE)
+    return GTK_ALIGN_FILL;
+  return align;
 }
 
 /**
@@ -13995,6 +14159,27 @@ gtk_widget_get_allocated_height (GtkWidget *widget)
   return widget->priv->allocation.height;
 }
 
+/**
+ * gtk_widget_get_allocated_baseline:
+ * @widget: the widget to query
+ *
+ * Returns the baseline that has currently been allocated to @widget.
+ * This function is intended to be used when implementing handlers
+ * for the #GtkWidget::draw function, and when allocating child
+ * widgets in #GtkWidget::size_allocate.
+ *
+ * Returns: the baseline of the @widget, or -1 if none
+ *
+ * Since: 3.10
+ **/
+int
+gtk_widget_get_allocated_baseline (GtkWidget *widget)
+{
+  g_return_val_if_fail (GTK_IS_WIDGET (widget), 0);
+
+  return widget->priv->allocated_baseline;
+}
+
 /**
  * gtk_widget_get_requisition:
  * @widget: a #GtkWidget

gtk/gtkwidget.h

@@ -433,14 +433,23 @@ struct _GtkWidgetClass
   gboolean     (* touch_event)            (GtkWidget     *widget,
                                            GdkEventTouch *event);
 
+  void         (* get_preferred_height_and_baseline_for_width)  (GtkWidget     *widget,
+								 gint           width,
+								 gint          *minimum_height,
+								 gint          *natural_height,
+								 gint          *minimum_baseline,
+								 gint          *natural_baseline);
+  void         (* adjust_baseline_request)(GtkWidget         *widget,
+                                           gint              *minimum_baseline,
+                                           gint              *natural_baseline);
+  void         (* adjust_baseline_allocation) (GtkWidget         *widget,
+					       gint              *baseline);
+
   /*< private >*/
 
   GtkWidgetClassPrivate *priv;
 
   /* Padding for future expansion */
-  void (*_gtk_reserved2) (void);
-  void (*_gtk_reserved3) (void);
-  void (*_gtk_reserved4) (void);
   void (*_gtk_reserved5) (void);
   void (*_gtk_reserved6) (void);
   void (*_gtk_reserved7) (void);
@@ -498,6 +507,10 @@ void       gtk_widget_size_request        (GtkWidget           *widget,
                                            GtkRequisition      *requisition);
 void	   gtk_widget_size_allocate	  (GtkWidget	       *widget,
 					   GtkAllocation       *allocation);
+GDK_AVAILABLE_IN_3_10
+void	   gtk_widget_size_allocate_with_baseline	  (GtkWidget	       *widget,
+							   GtkAllocation       *allocation,
+							   gint                 baseline);
 
 GtkSizeRequestMode  gtk_widget_get_request_mode               (GtkWidget      *widget);
 void                gtk_widget_get_preferred_width            (GtkWidget      *widget,
@@ -514,9 +527,22 @@ void                gtk_widget_get_preferred_width_for_height (GtkWidget      *w
                                                                gint            height,
                                                                gint           *minimum_width,
                                                                gint           *natural_width);
+GDK_AVAILABLE_IN_3_10
+void   gtk_widget_get_preferred_height_and_baseline_for_width (GtkWidget     *widget,
+							       gint           width,
+							       gint          *minimum_height,
+							       gint          *natural_height,
+							       gint          *minimum_baseline,
+							       gint          *natural_baseline);
 void                gtk_widget_get_preferred_size             (GtkWidget      *widget,
                                                                GtkRequisition *minimum_size,
                                                                GtkRequisition *natural_size);
+GDK_AVAILABLE_IN_3_10
+void                gtk_widget_get_preferred_size_and_baseline (GtkWidget      *widget,
+								GtkRequisition *minimum_size,
+								GtkRequisition *natural_size,
+								gint           *minimum_baseline,
+								gint           *natural_baseline);
 
 GDK_DEPRECATED_IN_3_0_FOR(gtk_widget_get_preferred_size)
 void       gtk_widget_get_child_requisition (GtkWidget         *widget,
@@ -662,6 +688,8 @@ void                  gtk_widget_unregister_window      (GtkWidget    *widget,
 
 int                   gtk_widget_get_allocated_width    (GtkWidget     *widget);
 int                   gtk_widget_get_allocated_height   (GtkWidget     *widget);
+GDK_AVAILABLE_IN_3_10
+int                   gtk_widget_get_allocated_baseline (GtkWidget     *widget);
 
 void                  gtk_widget_get_allocation         (GtkWidget     *widget,
                                                          GtkAllocation *allocation);
@@ -760,6 +788,8 @@ GtkAlign gtk_widget_get_halign        (GtkWidget *widget);
 void     gtk_widget_set_halign        (GtkWidget *widget,
                                        GtkAlign   align);
 GtkAlign gtk_widget_get_valign        (GtkWidget *widget);
+GDK_AVAILABLE_IN_3_10
+GtkAlign gtk_widget_get_valign_with_baseline (GtkWidget *widget);
 void     gtk_widget_set_valign        (GtkWidget *widget,
                                        GtkAlign   align);
 gint     gtk_widget_get_margin_left   (GtkWidget *widget);

gtk/gtkwidgetprivate.h

@@ -69,7 +69,10 @@ void _gtk_widget_compute_size_for_orientation  (GtkWidget         *widget,
                                                 GtkOrientation     orientation,
                                                 gint               for_size,
                                                 gint              *minimum_size,
-                                                gint              *natural_size);
+                                                gint              *natural_size,
+						gint              *minimum_baseline,
+						gint              *natural_baseline);
+gboolean _gtk_widget_has_baseline_support (GtkWidget *widget);
 
 gboolean _gtk_widget_get_translation_to_window (GtkWidget      *widget,
                                                 GdkWindow      *window,

tests/Makefile.am

@@ -36,6 +36,7 @@ noinst_PROGRAMS =  $(TEST_PROGS)	\
 	testappchooser			\
 	testappchooserbutton		\
 	testassistant			\
+	testbaseline			\
 	testbbox			\
 	testboxcss                      \
 	testbuttons			\
@@ -165,6 +166,7 @@ testiconview_DEPENDENCIES = $(TEST_DEPS)
 testaccel_DEPENDENCIES = $(TEST_DEPS)
 testadjustsize_DEPENDENCIES = $(TEST_DEPS)
 testassistant_DEPENDENCIES = $(TEST_DEPS)
+testbaseline_DEPENDENCIES = $(TEST_DEPS)
 testbbox_DEPENDENCIES = $(TEST_DEPS)
 testbuttons_DEPENDENCIES = $(TEST_DEPS)
 testcairo_DEPENDENCIES = $(TEST_DEPS)
@@ -356,6 +358,9 @@ testmerge_SOURCES = 		\
 testactions_SOURCES = 		\
 	testactions.c
 
+testbaseline_SOURCES = 		\
+	testbaseline.c
+
 testbbox_SOURCES = 		\
 	testbbox.c
 

tests/testbaseline.c

@@ -0,0 +1,382 @@
+/*
+ * Copyright (C) 2006 Nokia Corporation.
+ * Author: Xan Lopez <xan.lopez@nokia.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <gtk/gtk.h>
+
+static char *baseline_pos_str[] = {
+  "BASELINE_POSITION_TOP",
+  "BASELINE_POSITION_CENTER",
+  "BASELINE_POSITION_BOTTOM"
+};
+
+static void
+baseline_row_value_changed (GtkSpinButton *spin_button,
+			    GtkGrid *grid)
+{
+  gint row = gtk_spin_button_get_value_as_int (spin_button);
+
+  gtk_grid_set_baseline_row (grid, row);
+}
+
+static void
+homogeneous_changed (GtkToggleButton *toggle_button,
+		    GtkGrid *grid)
+{
+  gtk_grid_set_row_homogeneous (grid, gtk_toggle_button_get_active (toggle_button));
+}
+
+static void
+baseline_position_changed (GtkComboBox *combo,
+			   GtkBox *hbox)
+{
+  int i = gtk_combo_box_get_active (combo);
+
+  gtk_box_set_baseline_position (hbox, i);
+}
+
+static void
+image_size_value_changed (GtkSpinButton *spin_button,
+			  GtkImage *image)
+{
+  gint size = gtk_spin_button_get_value_as_int (spin_button);
+
+  gtk_image_set_pixel_size (GTK_IMAGE (image), size);
+}
+
+int
+main (int    argc,
+      char **argv)
+{
+  GtkWidget *window, *label, *entry, *button, *grid, *notebook;
+  GtkWidget *vbox, *hbox, *grid_hbox, *spin, *spin2, *toggle, *combo, *image, *ebox;
+  PangoFontDescription *font;
+  GtkAdjustment *adjustment;
+  int i, j;
+
+  gtk_init (&argc, &argv);
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  g_signal_connect (G_OBJECT (window), "delete-event", G_CALLBACK (gtk_main_quit), NULL);
+
+  notebook = gtk_notebook_new ();
+  gtk_container_add (GTK_CONTAINER (window), notebook);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+  gtk_notebook_append_page (GTK_NOTEBOOK (notebook),
+			    vbox, gtk_label_new ("hboxes"));
+
+  for (j = 0; j < 2; j++)
+    {
+      hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
+      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 5);
+
+      char *aligns_names[] = { "FILL", "BASELINE" };
+      GtkAlign aligns[] = { GTK_ALIGN_FILL, GTK_ALIGN_BASELINE};
+
+      label = gtk_label_new (aligns_names[j]);
+      gtk_container_add (GTK_CONTAINER (hbox), label);
+
+      for (i = 0; i < 3; i++) {
+	label = gtk_label_new ("│XYyj,Ö...");
+
+	font = pango_font_description_new ();
+	pango_font_description_set_size (font, 5*(i+1)* 1024);
+	gtk_widget_override_font (label, font);
+
+	gtk_widget_set_valign (label, aligns[j]);
+
+	gtk_container_add (GTK_CONTAINER (hbox), label);
+      }
+
+      for (i = 0; i < 3; i++) {
+	entry = gtk_entry_new ();
+	gtk_entry_set_text (GTK_ENTRY (entry), "│XYyj,Ö...");
+
+	font = pango_font_description_new ();
+	pango_font_description_set_size (font, 5*(i+1)* 1024);
+	gtk_widget_override_font (entry, font);
+
+	gtk_widget_set_valign (entry, aligns[j]);
+
+	gtk_container_add (GTK_CONTAINER (hbox), entry);
+      }
+
+      spin = gtk_spin_button_new (NULL, 0, 1);
+      gtk_orientable_set_orientation (GTK_ORIENTABLE (spin), GTK_ORIENTATION_VERTICAL);
+      gtk_widget_set_valign (spin, aligns[j]);
+      gtk_container_add (GTK_CONTAINER (hbox), spin);
+    }
+
+  grid_hbox = hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 5);
+
+  combo = gtk_combo_box_text_new ();
+  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), baseline_pos_str[0]);
+  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), baseline_pos_str[1]);
+  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), baseline_pos_str[2]);
+  gtk_combo_box_set_active (GTK_COMBO_BOX (combo), 1);
+  gtk_container_add (GTK_CONTAINER (hbox), combo);
+
+  for (j = 0; j < 2; j++)
+    {
+      hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
+      gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 5);
+
+      g_signal_connect (G_OBJECT (combo), "changed",
+			G_CALLBACK (baseline_position_changed), hbox);
+
+      if (j == 0)
+	label = gtk_label_new ("Baseline:");
+      else
+	label = gtk_label_new ("Normal:");
+      gtk_container_add (GTK_CONTAINER (hbox), label);
+
+      for (i = 0; i < 3; i++)
+	{
+	  button = gtk_button_new_with_label ("│Xyj,Ö");
+
+	  font = pango_font_description_new ();
+	  pango_font_description_set_size (font, 5*(i+1)* 1024);
+	  gtk_widget_override_font (button, font);
+
+	  if (j == 0)
+	    gtk_widget_set_valign (button, GTK_ALIGN_BASELINE);
+
+	  gtk_container_add (GTK_CONTAINER (hbox), button);
+	}
+
+      for (i = 0; i < 3; i++)
+	{
+	  button = gtk_button_new_with_label ("│Xyj,Ö");
+
+	  gtk_button_set_image (GTK_BUTTON (button),
+				gtk_image_new_from_icon_name ("face-sad", GTK_ICON_SIZE_BUTTON));
+	  gtk_button_set_always_show_image (GTK_BUTTON (button), TRUE);
+
+	  font = pango_font_description_new ();
+	  pango_font_description_set_size (font, 5*(i+1)* 1024);
+	  gtk_widget_override_font (button, font);
+
+	  if (j == 0)
+	    gtk_widget_set_valign (button, GTK_ALIGN_BASELINE);
+
+	  gtk_container_add (GTK_CONTAINER (hbox), button);
+	}
+
+      ebox = gtk_event_box_new ();
+      if (j == 0)
+	gtk_widget_set_valign (ebox, GTK_ALIGN_BASELINE);
+      gtk_container_add (GTK_CONTAINER (hbox), ebox);
+
+      image = gtk_image_new_from_icon_name ("face-sad", GTK_ICON_SIZE_BUTTON);
+      gtk_image_set_pixel_size (GTK_IMAGE (image), 34);
+      if (j == 0)
+	gtk_widget_set_valign (image, GTK_ALIGN_BASELINE);
+      gtk_container_add (GTK_CONTAINER (ebox), image);
+
+      button = gtk_toggle_button_new_with_label ("│Xyj,Ö");
+      if (j == 0)
+	gtk_widget_set_valign (button, GTK_ALIGN_BASELINE);
+      gtk_container_add (GTK_CONTAINER (hbox), button);
+
+      button = gtk_toggle_button_new_with_label ("│Xyj,Ö");
+      gtk_toggle_button_set_mode (GTK_TOGGLE_BUTTON (button), TRUE);
+      if (j == 0)
+	gtk_widget_set_valign (button, GTK_ALIGN_BASELINE);
+      gtk_container_add (GTK_CONTAINER (hbox), button);
+
+      button = gtk_check_button_new_with_label ("│Xyj,Ö");
+      if (j == 0)
+	gtk_widget_set_valign (button, GTK_ALIGN_BASELINE);
+      gtk_container_add (GTK_CONTAINER (hbox), button);
+
+      button = gtk_radio_button_new_with_label (NULL, "│Xyj,Ö");
+      if (j == 0)
+	gtk_widget_set_valign (button, GTK_ALIGN_BASELINE);
+      gtk_container_add (GTK_CONTAINER (hbox), button);
+    }
+
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+  gtk_notebook_append_page (GTK_NOTEBOOK (notebook),
+			    vbox, gtk_label_new ("grid"));
+
+  grid_hbox = hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 5);
+
+  label = gtk_label_new ("Align me:");
+  gtk_widget_set_valign (label, GTK_ALIGN_BASELINE);
+
+  gtk_container_add (GTK_CONTAINER (hbox), label);
+
+  grid = gtk_grid_new ();
+  gtk_widget_set_valign (grid, GTK_ALIGN_BASELINE);
+  gtk_grid_set_column_spacing (GTK_GRID (grid), 8);
+  gtk_grid_set_row_spacing (GTK_GRID (grid), 8);
+
+  for (j = 0; j < 4; j++)
+    {
+      char *labels[] = { "Normal:", "Baseline (top):", "Baseline (center):", "Baseline (bottom):"};
+      label = gtk_label_new (labels[j]);
+
+      gtk_grid_attach (GTK_GRID (grid),
+		       label,
+		       0, j,
+		       1, 1);
+      gtk_widget_set_vexpand (label, TRUE);
+
+      if (j != 0)
+	gtk_grid_set_row_baseline_position (GTK_GRID (grid),
+					    j, (GtkBaselinePosition)(j-1));
+
+      for (i = 0; i < 3; i++)
+	{
+	  label = gtk_label_new ("Xyjg,Ö.");
+
+	  font = pango_font_description_new ();
+	  pango_font_description_set_size (font, 5*(i+1)* 1024);
+	  gtk_widget_override_font (label, font);
+
+	  if (j != 0)
+	    gtk_widget_set_valign (label, GTK_ALIGN_BASELINE);
+
+	  gtk_grid_attach (GTK_GRID (grid),
+			   label,
+			   i+1, j,
+			   1, 1);
+	}
+
+      for (i = 0; i < 3; i++)
+	{
+	  button = gtk_button_new_with_label ("│Xyj,Ö");
+
+	  gtk_button_set_image (GTK_BUTTON (button),
+				gtk_image_new_from_icon_name ("face-sad", GTK_ICON_SIZE_BUTTON));
+	  gtk_button_set_always_show_image (GTK_BUTTON (button), TRUE);
+
+	  font = pango_font_description_new ();
+	  pango_font_description_set_size (font, 5*(i+1)* 1024);
+	  gtk_widget_override_font (button, font);
+
+	  if (j != 0)
+	    gtk_widget_set_valign (button, GTK_ALIGN_BASELINE);
+
+	  gtk_grid_attach (GTK_GRID (grid),
+			   button,
+			   i+4, j,
+			   1, 1);
+	}
+
+    }
+
+  gtk_container_add (GTK_CONTAINER (hbox), grid);
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 5);
+
+  adjustment = gtk_adjustment_new (0.0, -1.0, 5.0, 1.0, 1.0, 0.0);
+  spin = gtk_spin_button_new (adjustment, 1.0, 0);
+  g_signal_connect (spin, "value-changed", (GCallback)baseline_row_value_changed, grid);
+  gtk_container_add (GTK_CONTAINER (hbox), spin);
+
+  toggle = gtk_toggle_button_new_with_label ("Homogeneous");
+  g_signal_connect (toggle, "toggled", (GCallback)homogeneous_changed, grid);
+  gtk_container_add (GTK_CONTAINER (hbox), toggle);
+
+  combo = gtk_combo_box_text_new ();
+  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), baseline_pos_str[0]);
+  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), baseline_pos_str[1]);
+  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo), baseline_pos_str[2]);
+  gtk_combo_box_set_active (GTK_COMBO_BOX (combo), 1);
+  g_signal_connect (G_OBJECT (combo), "changed",
+		    G_CALLBACK (baseline_position_changed), grid_hbox);
+  gtk_container_add (GTK_CONTAINER (hbox), combo);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+  gtk_notebook_append_page (GTK_NOTEBOOK (notebook),
+			    vbox, gtk_label_new ("button box"));
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 5);
+
+  adjustment = gtk_adjustment_new (34.0, 1.0, 64.0, 1.0, 1.0, 0.0);
+  spin = gtk_spin_button_new (adjustment, 1.0, 0);
+  gtk_container_add (GTK_CONTAINER (hbox), spin);
+
+  adjustment = gtk_adjustment_new (16.0, 1.0, 64.0, 1.0, 1.0, 0.0);
+  spin2 = gtk_spin_button_new (adjustment, 1.0, 0);
+  gtk_container_add (GTK_CONTAINER (hbox), spin2);
+
+  for (j = 0; j < 3; j++)
+    {
+      hbox = gtk_button_box_new (GTK_ORIENTATION_HORIZONTAL);
+      gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 5);
+
+      gtk_box_set_baseline_position (GTK_BOX (hbox), j);
+
+      label = gtk_label_new (baseline_pos_str[j]);
+      gtk_container_add (GTK_CONTAINER (hbox), label);
+      gtk_widget_set_vexpand (label, TRUE);
+
+      image = gtk_image_new_from_icon_name ("face-sad", GTK_ICON_SIZE_BUTTON);
+      gtk_image_set_pixel_size (GTK_IMAGE (image), 34);
+      gtk_container_add (GTK_CONTAINER (hbox), image);
+
+      g_signal_connect (spin, "value-changed", (GCallback)image_size_value_changed, image);
+
+      for (i = 0; i < 3; i++)
+	{
+	  button = gtk_button_new_with_label ("│Xyj,Ö");
+
+	  font = pango_font_description_new ();
+	  pango_font_description_set_size (font, 5*(i+1)* 1024);
+	  gtk_widget_override_font (button, font);
+
+	  if (i != 0)
+	    gtk_widget_set_valign (button, GTK_ALIGN_BASELINE);
+
+	  gtk_container_add (GTK_CONTAINER (hbox), button);
+	}
+
+      for (i = 0; i < 3; i++)
+	{
+	  button = gtk_button_new_with_label ("│Xyj,Ö");
+
+	  image = gtk_image_new_from_icon_name ("face-sad", GTK_ICON_SIZE_BUTTON);
+	  gtk_image_set_pixel_size (GTK_IMAGE (image), 16);
+	  gtk_button_set_image (GTK_BUTTON (button), image);
+	  if (i == 0)
+	    g_signal_connect (spin2, "value-changed", (GCallback)image_size_value_changed, image);
+	  gtk_button_set_always_show_image (GTK_BUTTON (button), TRUE);
+
+	  font = pango_font_description_new ();
+	  pango_font_description_set_size (font, 5*(i+1)* 1024);
+	  gtk_widget_override_font (button, font);
+
+	  gtk_widget_set_valign (button, GTK_ALIGN_BASELINE);
+
+	  gtk_container_add (GTK_CONTAINER (hbox), button);
+	}
+    }
+
+  gtk_widget_show_all (window);
+
+  gtk_main ();
+
+  return 0;
+}