gridview: Add tests for tile split

These tests are reusing the section model plumbing
of the listitemmanager tests, and just check that
splitting tiles according to a certain number of
columns works

gtk/gtkgridview.c

@@ -19,16 +19,18 @@
 
 #include "config.h"
 
-#include "gtkgridview.h"
+#include "gtkgridviewprivate.h"
 
 #include "gtkbitset.h"
 #include "gtklistbaseprivate.h"
+#include "gtklistheaderwidgetprivate.h"
 #include "gtklistitemfactory.h"
 #include "gtklistitemmanagerprivate.h"
 #include "gtklistitemwidgetprivate.h"
 #include "gtkmultiselection.h"
 #include "gtktypebuiltins.h"
 #include "gtkwidgetprivate.h"
+#include "gtksectionmodel.h"
 
 /* Maximum number of list items created by the gridview.
  * For debugging, you can set this to G_MAXUINT to ensure
@@ -87,12 +89,19 @@ struct _GtkGridView
 
   GtkListItemManager *item_manager;
   GtkListItemFactory *factory;
+  GtkListItemFactory *header_factory;
   guint min_columns;
   guint max_columns;
   gboolean single_click_activate;
   /* set in size_allocate */
   guint n_columns;
   double column_width;
+
+  /* for debugging between get_position_from_allocation and size_allocate */
+  unsigned int anchor_position;
+  unsigned int anchor_column;
+  unsigned int anchor_n_columns;
+  gboolean anchor_has_sections;
 };
 
 struct _GtkGridViewClass
@@ -105,6 +114,7 @@ enum
   PROP_0,
   PROP_ENABLE_RUBBERBAND,
   PROP_FACTORY,
+  PROP_HEADER_FACTORY,
   PROP_MAX_COLUMNS,
   PROP_MIN_COLUMNS,
   PROP_MODEL,
@@ -257,6 +267,13 @@ gtk_grid_view_split (GtkListBase *base,
   return split;
 }
 
+static void
+gtk_grid_view_prepare_section (GtkListBase *base,
+                               GtkListTile *tile,
+                               guint        position)
+{
+}
+
 /* We define the listview as **inert** when the factory isn't used. */
 static gboolean
 gtk_grid_view_is_inert (GtkGridView *self)
@@ -269,7 +286,8 @@ gtk_grid_view_is_inert (GtkGridView *self)
 
 static void
 gtk_grid_view_update_factories_with (GtkGridView        *self,
-                                     GtkListItemFactory *factory)
+                                     GtkListItemFactory *factory,
+                                     GtkListItemFactory *header_factory)
 {
   GtkListTile *tile;
 
@@ -277,8 +295,26 @@ gtk_grid_view_update_factories_with (GtkGridView        *self,
        tile != NULL;
        tile = gtk_rb_tree_node_get_next (tile))
     {
-      if (tile->widget)
-        gtk_list_factory_widget_set_factory (GTK_LIST_FACTORY_WIDGET (tile->widget), factory);
+      switch (tile->type)
+        {
+        case GTK_LIST_TILE_ITEM:
+          if (tile->widget)
+            gtk_list_factory_widget_set_factory (GTK_LIST_FACTORY_WIDGET (tile->widget), factory);
+          break;
+        case GTK_LIST_TILE_HEADER:
+          if (tile->widget)
+            gtk_list_header_widget_set_factory (GTK_LIST_HEADER_WIDGET (tile->widget), header_factory);
+          break;
+        case GTK_LIST_TILE_UNMATCHED_HEADER:
+        case GTK_LIST_TILE_FOOTER:
+        case GTK_LIST_TILE_UNMATCHED_FOOTER:
+        case GTK_LIST_TILE_REMOVED:
+          g_assert (tile->widget == NULL);
+          break;
+        default:
+          g_assert_not_reached();
+          break;
+        }
     }
 }
 
@@ -286,13 +322,14 @@ static void
 gtk_grid_view_update_factories (GtkGridView *self)
 {
   gtk_grid_view_update_factories_with (self,
-                                       gtk_grid_view_is_inert (self) ? NULL : self->factory);
+                                       gtk_grid_view_is_inert (self) ? NULL : self->factory,
+                                       gtk_grid_view_is_inert (self) ? NULL : self->header_factory);
 }
 
 static void
 gtk_grid_view_clear_factories (GtkGridView *self)
 {
-  gtk_grid_view_update_factories_with (self, NULL);
+  gtk_grid_view_update_factories_with (self, NULL, NULL);
 }
 
 static GtkListItemBase *
@@ -316,6 +353,20 @@ gtk_grid_view_create_list_widget (GtkListBase *base)
   return GTK_LIST_ITEM_BASE (result);
 }
 
+static GtkListHeaderBase *
+gtk_grid_view_create_header_widget (GtkListBase *base)
+{
+  GtkGridView *self = GTK_GRID_VIEW (base);
+  GtkListItemFactory *factory;
+
+  if (gtk_grid_view_is_inert (self))
+    factory = NULL;
+  else
+    factory = self->header_factory;
+
+  return GTK_LIST_HEADER_BASE (gtk_list_header_widget_new (factory));
+}
+
 static gboolean
 gtk_grid_view_get_allocation (GtkListBase  *base,
                               guint         pos,
@@ -384,6 +435,79 @@ gtk_grid_view_get_allocation (GtkListBase  *base,
   return TRUE;
 }
 
+/* Returns the section that position falls into
+ */
+static void
+get_section_for_position (GtkListItemManager *items,
+                          unsigned int        position,
+                          unsigned int       *section_start,
+                          unsigned int       *section_end)
+{
+  GListModel *model;
+  unsigned int start, end;
+
+  model = G_LIST_MODEL (gtk_list_item_manager_get_model (items));
+
+  if (!gtk_list_item_manager_get_has_sections (items))
+    {
+      start = 0;
+      end = g_list_model_get_n_items (model);
+    }
+  else
+    {
+      gtk_section_model_get_section (GTK_SECTION_MODEL (model), position, &start, &end);
+    }
+
+  if (section_start)
+    *section_start = start;
+  if (section_end)
+    *section_end = end;
+}
+
+/* Returns the column that the given item will fall in, taking
+ * sections into account. Note that this depends on whether
+ * we are currently showing sections, and on the number of
+ * columns that the grid is allocating.
+ */
+unsigned int
+gtk_grid_view_get_column_for_position (GtkListItemManager *items,
+                                       unsigned int        n_columns,
+                                       unsigned int        position)
+{
+  unsigned int start;
+
+  get_section_for_position (items, position, &start, NULL);
+
+  return (position - start) % n_columns;
+}
+
+/* Determine whether a tile is contained in a single row,
+ * or spans multiple rows.
+ */
+gboolean
+gtk_grid_view_is_multirow_tile (GtkListItemManager *items,
+                                unsigned int        n_columns,
+                                GtkListTile        *tile)
+{
+  unsigned int position;
+  unsigned int start, start2;
+  unsigned int col;
+
+  if (tile->n_items <= 1)
+    return FALSE;
+
+  position = gtk_list_tile_get_position (items, tile);
+  get_section_for_position (items, position, &start, NULL);
+  get_section_for_position (items, position + tile->n_items - 1, &start2, NULL);
+
+  if (start != start2)
+    return TRUE;
+
+  col = (position - start) % n_columns;
+
+  return col + tile->n_items - 1 > n_columns;
+}
+
 static gboolean
 gtk_grid_view_get_position_from_allocation (GtkListBase           *base,
                                             int                    x,
@@ -394,6 +518,7 @@ gtk_grid_view_get_position_from_allocation (GtkListBase           *base,
   GtkGridView *self = GTK_GRID_VIEW (base);
   GtkListTile *tile;
   guint pos;
+  guint col;
 
   tile = gtk_list_item_manager_get_nearest_tile (self->item_manager, x, y);
   if (tile == NULL)
@@ -411,44 +536,43 @@ gtk_grid_view_get_position_from_allocation (GtkListBase           *base,
     }
 
   pos = gtk_list_tile_get_position (self->item_manager, tile);
+  col = gtk_grid_view_get_column_for_position (self->item_manager, self->n_columns, pos);
+
   if (tile->n_items > 1)
     {
       int xspacing, yspacing;
+      guint row_height;
+      guint row_index;
 
       gtk_list_base_get_border_spacing (base, &xspacing, &yspacing);
 
       /* offset in x direction */
-      pos += column_index (self, xspacing, MAX (tile->area.width - 1, x - tile->area.x));
-      if (area)
-        {
-          guint col = MIN (column_index (self, xspacing, x), self->n_columns - 1);
-          area->x = column_start (self, xspacing, col);
-          area->width = column_end (self, xspacing, col) - area->x;
-        }
+      pos += column_index (self, xspacing, MAX (tile->area.width - 1, x - tile->area.x)) - col;
 
       /* offset in y direction */
       if (tile->n_items > self->n_columns)
         {
           guint rows_in_tile = tile->n_items / self->n_columns;
-          guint row_height = (tile->area.height + yspacing) / rows_in_tile - yspacing;
-          guint row_index = MIN (tile->area.height - 1, y - tile->area.y) / (row_height + yspacing);
-          pos += self->n_columns * row_index;
 
-          if (area)
-            {
-              area->y = tile->area.y  + row_index * (row_height + yspacing);
-              area->height = row_height;
-            }
+          row_height = (tile->area.height + yspacing) / rows_in_tile - yspacing;
+          row_index = MIN (tile->area.height - 1, y - tile->area.y) / (row_height + yspacing);
+          pos += self->n_columns * row_index;
         }
       else
         {
-          if (area)
-            {
-              area->y = tile->area.y;
-              area->height = tile->area.height;
-            }
+          row_height = tile->area.height;
+          row_index = 0;
         }
 
+      col = gtk_grid_view_get_column_for_position (self->item_manager, self->n_columns, pos);
+
+      if (area)
+        {
+          area->x = column_start (self, xspacing, col);
+          area->width = column_end (self, xspacing, col) - area->x;
+          area->y = tile->area.y  + row_index * (row_height + yspacing);
+          area->height = row_height;
+        }
     }
   else
     {
@@ -456,6 +580,11 @@ gtk_grid_view_get_position_from_allocation (GtkListBase           *base,
         *area = tile->area;
     }
 
+  self->anchor_position = pos;
+  self->anchor_column = col;
+  self->anchor_n_columns = self->n_columns;
+  self->anchor_has_sections = gtk_list_item_manager_get_has_sections (self->item_manager);
+
   *position = pos;
 
   return TRUE;
@@ -632,6 +761,86 @@ gtk_grid_view_compute_n_columns (GtkGridView *self,
   return n_columns;
 }
 
+void
+gtk_grid_view_split_tiles_by_columns (GtkListItemManager *items,
+                                      guint               n_columns)
+{
+  GtkListTile *tile;
+
+  tile = gtk_list_item_manager_get_first (items);
+
+  while (tile != NULL)
+    {
+      /* Handle multirow tiles first */
+      if (tile->n_items > 1)
+        {
+          guint pos, col;
+          guint end, remaining;
+
+          pos = gtk_list_tile_get_position (items, tile);
+          col = gtk_grid_view_get_column_for_position (items, n_columns, pos);
+          get_section_for_position (items, pos, NULL, &end);
+
+          if (col > 0)
+            {
+              /* Determine if the first row needs to be split off */
+              remaining = MIN (n_columns - col, end - 1 - pos);
+              if (remaining > 0 && tile->n_items > remaining)
+                {
+                  gtk_list_tile_split (items, tile, remaining);
+                  tile = gtk_rb_tree_node_get_next (tile);
+                  continue;
+                }
+            }
+
+          pos += tile->n_items - 1;
+          col = gtk_grid_view_get_column_for_position (items, n_columns, pos);
+          get_section_for_position (items, pos, NULL, &end);
+
+          if (col < n_columns - 1)
+            {
+              /* Determine if the last row needs to be split off */
+              remaining = MIN (n_columns - (col - 1), end - 1 - pos);
+              if (remaining > 0 && col + 1 < tile->n_items)
+                {
+                  gtk_list_tile_split (items, tile, tile->n_items - (col + 1));
+                  tile = gtk_rb_tree_node_get_next (tile);
+                  tile = gtk_rb_tree_node_get_next (tile);
+                  continue;
+                }
+            }
+        }
+
+      tile = gtk_rb_tree_node_get_next (tile);
+    }
+
+#ifdef G_ENABLE_DEBUG
+  /* Verify some invariants:
+   * - there are no removed tiles left
+   * - multirow tiles start in column 0
+   * - non-multirow tiles are contained in one row
+   */
+  for (tile = gtk_list_item_manager_get_first (items);
+       tile != NULL;
+       tile = gtk_rb_tree_node_get_next (tile))
+    {
+      g_assert (tile->type != GTK_LIST_TILE_REMOVED);
+      if (tile->n_items > 1)
+        {
+          unsigned int pos, col;
+
+          pos = gtk_list_tile_get_position (items, tile);
+          col = gtk_grid_view_get_column_for_position (items, n_columns, pos);
+
+          if (gtk_grid_view_is_multirow_tile (items, n_columns, tile))
+            g_assert (col == 0);
+          else
+            g_assert (col + tile->n_items - 1 <= n_columns);
+        }
+    }
+#endif
+}
+
 static void
 gtk_grid_view_measure_list (GtkWidget *widget,
                             int        for_size,
@@ -670,7 +879,7 @@ gtk_grid_view_measure_list (GtkWidget *widget,
         {
           gtk_widget_measure (tile->widget,
                               gtk_list_base_get_orientation (GTK_LIST_BASE (self)),
-                              column_size,
+                              gtk_list_tile_is_header (tile) ? for_size : column_size,
                               &child_min, &child_nat, NULL, NULL);
           if (scroll_policy == GTK_SCROLL_MINIMUM)
             row_height = MAX (row_height, child_min);
@@ -679,7 +888,10 @@ gtk_grid_view_measure_list (GtkWidget *widget,
           measured = TRUE;
         }
 
-      i += tile->n_items;
+      if (gtk_list_tile_is_footer (tile) || gtk_list_tile_is_header (tile))
+        i = n_columns;
+      else
+        i += tile->n_items;
 
       if (i >= n_columns)
         {
@@ -775,34 +987,34 @@ gtk_grid_view_size_allocate (GtkWidget *widget,
   self->column_width = ((orientation == GTK_ORIENTATION_VERTICAL ? width : height) + xspacing) / self->n_columns - xspacing;
   self->column_width = MAX (self->column_width, col_min);
 
-  /* step 2: determine height of known rows */
+  /* step 2: split tiles as required */
+  gtk_grid_view_split_tiles_by_columns (self->item_manager, self->n_columns);
+
+  /* step 3: determine height of known rows */
   heights = g_array_new (FALSE, FALSE, sizeof (int));
 
+  tile = gtk_list_item_manager_get_first (self->item_manager);
   while (tile != NULL)
     {
-      /* if it's a multirow tile, handle it here */
-      if (tile->n_items > 1 && tile->n_items >= self->n_columns)
+      if (gtk_grid_view_is_multirow_tile (self->item_manager, self->n_columns, tile))
         {
-          if (tile->n_items % self->n_columns)
-            gtk_list_tile_split (self->item_manager, tile, tile->n_items / self->n_columns * self->n_columns);
           tile = gtk_rb_tree_node_get_next (tile);
           continue;
         }
 
-      /* Not a multirow tile */
-      i = 0;
       row_height = 0;
 
       for (i = 0, start = tile;
            i < self->n_columns && tile != NULL;
            tile = gtk_rb_tree_node_get_next (tile))
         {
+          g_assert (!gtk_grid_view_is_multirow_tile (self->item_manager, self->n_columns, tile));
           if (tile->widget)
             {
               int min, nat, size;
               gtk_widget_measure (tile->widget,
                                   gtk_list_base_get_orientation (GTK_LIST_BASE (self)),
-                                  self->column_width,
+                                  gtk_list_tile_is_header (tile) ? width : self->column_width,
                                   &min, &nat, NULL, NULL);
               if (scroll_policy == GTK_SCROLL_MINIMUM)
                 size = min;
@@ -812,32 +1024,59 @@ gtk_grid_view_size_allocate (GtkWidget *widget,
               g_array_append_val (heights, size);
               row_height = MAX (row_height, size);
             }
-          if (tile->n_items > self->n_columns - i)
-            gtk_list_tile_split (self->item_manager, tile, self->n_columns - i);
-          i += tile->n_items;
+          if (gtk_list_tile_is_footer (tile) || gtk_list_tile_is_header (tile))
+            i = self->n_columns;
+          else
+            i += tile->n_items;
         }
+
       if (row_height > 0)
         {
           for (i = 0;
                start != tile;
                start = gtk_rb_tree_node_get_next (start))
             {
+              int n_columns;
+              int tile_height;
+
+              if (gtk_list_tile_is_footer (start))
+                {
+                  n_columns = self->n_columns - i;
+                  if (n_columns != 0 && n_columns != self->n_columns)
+                    tile_height = row_height;
+                  else
+                    tile_height = 0;
+                }
+              else if (gtk_list_tile_is_header (start))
+                {
+                  g_assert (i == 0);
+                  n_columns = self->n_columns;
+                  if (gtk_list_item_manager_get_has_sections (self->item_manager))
+                    tile_height = row_height;
+                  else
+                    tile_height = 0;
+                }
+              else
+                {
+                  n_columns = start->n_items;
+                  tile_height = row_height;
+                }
+
               gtk_list_tile_set_area_size (self->item_manager,
                                            start,
-                                           column_end (self, xspacing, i + start->n_items - 1)
+                                           column_end (self, xspacing, i + n_columns - 1)
                                            - column_start (self, xspacing, i),
-                                           row_height);
-              i += start->n_items;
+                                           tile_height);
+              i += n_columns;
             }
-          g_assert (i <= self->n_columns);
         }
     }
 
-  /* step 3: determine height of rows with only unknown items */
+  /* step 4: determine height of rows with only unknown items */
   unknown_row_height = gtk_grid_view_get_unknown_row_size (self, heights);
   g_array_free (heights, TRUE);
 
-  /* step 4: determine height for remaining rows and set each row's position */
+  /* step 5: determine height for remaining rows and set each row's position */
   y = 0;
   i = 0;
   for (tile = gtk_list_item_manager_get_first (self->item_manager);
@@ -848,55 +1087,71 @@ gtk_grid_view_size_allocate (GtkWidget *widget,
                                        tile,
                                        column_start (self, xspacing, i),
                                        y);
-      if (tile->n_items >= self->n_columns && tile->widget == NULL)
+
+      if (gtk_list_tile_is_footer (tile))
+        {
+          if (i > 0)
+            i = self->n_columns;
+
+          if (!gtk_list_item_manager_get_has_sections (self->item_manager) && i == 0)
+            gtk_list_tile_set_area_size (self->item_manager,
+                                         tile,
+                                         column_end (self, xspacing, self->n_columns - 1)
+                                         - column_start (self, xspacing, 0),
+                                         0);
+        }
+      else if (gtk_list_tile_is_header (tile))
         {
           g_assert (i == 0);
-          g_assert (tile->n_items % self->n_columns == 0);
-          gtk_list_tile_set_area_size (self->item_manager,
-                                       tile,
-                                       column_end (self, xspacing, self->n_columns - 1)
-                                       - column_start (self, xspacing, 0),
-                                       (unknown_row_height + yspacing) * (tile->n_items / self->n_columns) - yspacing);
-          y += tile->area.height + yspacing;
+          i = self->n_columns;
+
+          if (!gtk_list_item_manager_get_has_sections (self->item_manager))
+            gtk_list_tile_set_area_size (self->item_manager,
+                                         tile,
+                                         column_end (self, xspacing, self->n_columns - 1)
+                                         - column_start (self, xspacing, 0),
+                                         0);
         }
       else
         {
-          if (tile->area.height == 0)
+          if (gtk_list_tile_get_position (self->item_manager, tile) == self->anchor_position &&
+              i != self->anchor_column)
+            {
+              g_print ("BAD: anchor column mismatch (anchor %u, column %u != %u, n_columns %u vs %u, sections %d vs %d)\n",
+                       self->anchor_position,
+                       self->anchor_column, i,
+                       self->anchor_n_columns, self->n_columns,
+                       self->anchor_has_sections, gtk_list_item_manager_get_has_sections (self->item_manager));
+            }
+
+          if (gtk_grid_view_is_multirow_tile (self->item_manager, self->n_columns, tile))
+            {
+              g_assert (i == 0);
+              gtk_list_tile_set_area_size (self->item_manager,
+                                           tile,
+                                           column_end (self, xspacing, self->n_columns - 1)
+                                           - column_start (self, xspacing, 0),
+                                           (unknown_row_height + yspacing) * (tile->n_items / self->n_columns) - yspacing);
+              y += tile->area.height + yspacing;
+            }
+          else
             {
-              /* this case is for the last row - it may not be a full row so it won't
-               * be a multirow tile but it may have no widgets either */
               gtk_list_tile_set_area_size (self->item_manager,
                                            tile,
                                            column_end (self, xspacing, i + tile->n_items - 1) - tile->area.x,
                                            unknown_row_height);
+              i += tile->n_items;
             }
-          i += tile->n_items;
         }
 
       if (i >= self->n_columns)
         {
-          g_assert (i == self->n_columns);
           y += tile->area.height + yspacing;
           i = 0;
         }
     }
-  /* Add a filler tile for empty space in the bottom right */
-  if (i > 0)
-    {
-      GtkListTile *footer = gtk_list_item_manager_get_last (self->item_manager);
-      g_assert (gtk_list_tile_is_footer (footer));
-      tile = gtk_rb_tree_node_get_previous (footer);
-      gtk_list_tile_set_area_position (self->item_manager,
-                                       footer,
-                                       column_start (self, xspacing, i),
-                                       y);
-      gtk_list_tile_set_area_size (self->item_manager,
-                                   footer,
-                                   column_end (self, xspacing, self->n_columns - 1) - footer->area.x,
-                                   tile->area.height);
-    }
 
-  /* step 4: allocate the rest */
+  /* step 6: allocate the widgets */
   gtk_list_base_allocate (GTK_LIST_BASE (self));
 }
 
@@ -952,6 +1207,7 @@ gtk_grid_view_dispose (GObject *object)
   self->item_manager = NULL;
 
   g_clear_object (&self->factory);
+  g_clear_object (&self->header_factory);
 
   G_OBJECT_CLASS (gtk_grid_view_parent_class)->dispose (object);
 }
@@ -974,6 +1230,10 @@ gtk_grid_view_get_property (GObject    *object,
       g_value_set_object (value, self->factory);
       break;
 
+    case PROP_HEADER_FACTORY:
+      g_value_set_object (value, self->header_factory);
+      break;
+
     case PROP_MAX_COLUMNS:
       g_value_set_uint (value, self->max_columns);
       break;
@@ -1018,6 +1278,10 @@ gtk_grid_view_set_property (GObject      *object,
       gtk_grid_view_set_factory (self, g_value_get_object (value));
       break;
 
+    case PROP_HEADER_FACTORY:
+      gtk_grid_view_set_header_factory (self, g_value_get_object (value));
+      break;
+
     case PROP_MAX_COLUMNS:
       gtk_grid_view_set_max_columns (self, g_value_get_uint (value));
       break;
@@ -1071,6 +1335,8 @@ gtk_grid_view_class_init (GtkGridViewClass *klass)
 
   list_base_class->split = gtk_grid_view_split;
   list_base_class->create_list_widget = gtk_grid_view_create_list_widget;
+  list_base_class->prepare_section = gtk_grid_view_prepare_section;
+  list_base_class->create_header_widget = gtk_grid_view_create_header_widget;
   list_base_class->get_allocation = gtk_grid_view_get_allocation;
   list_base_class->get_items_in_rect = gtk_grid_view_get_items_in_rect;
   list_base_class->get_position_from_allocation = gtk_grid_view_get_position_from_allocation;
@@ -1109,6 +1375,19 @@ gtk_grid_view_class_init (GtkGridViewClass *klass)
                          G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
 
 
+  /**
+   * GtkGridView:header-factory: (attributes org.gtk.Property.get=gtk_grid_view_get_header_factory org.gtk.Property.set=gtk_grid_view_set_header_factory)
+   *
+   * Factory for creating header widgets.
+   *
+   * Since: 4.12
+   */
+  properties[PROP_HEADER_FACTORY] =
+    g_param_spec_object ("header-factory", NULL, NULL,
+                         GTK_TYPE_LIST_ITEM_FACTORY,
+                         G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
+
+
   /**
    * GtkGridView:max-columns: (attributes org.gtk.Property.get=gtk_grid_view_get_max_columns org.gtk.Property.set=gtk_grid_view_set_max_columns)
    *
@@ -1342,6 +1621,69 @@ gtk_grid_view_set_factory (GtkGridView        *self,
   g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_FACTORY]);
 }
 
+/**
+ * gtk_grid_view_get_header_factory: (attributes org.gtk.Method.get_property=header-factory)
+ * @self: a `GtkGridView`
+ *
+ * Gets the factory that's currently used to populate section headers.
+ *
+ * Returns: (nullable) (transfer none): The factory in use
+ *
+ * Since: 4.12
+ */
+GtkListItemFactory *
+gtk_grid_view_get_header_factory (GtkGridView *self)
+{
+  g_return_val_if_fail (GTK_IS_GRID_VIEW (self), NULL);
+
+  return self->header_factory;
+}
+
+/**
+ * gtk_grid_view_set_header_factory: (attributes org.gtk.Method.set_property=header-factory)
+ * @self: a `GtkGridView`
+ * @factory: (nullable) (transfer none): the factory to use
+ *
+ * Sets the `GtkListItemFactory` to use for populating the
+ * [class@Gtk.ListHeader] objects used in section headers.
+ *
+ * If this factory is set to %NULL, the list will not show section headers.
+ *
+ * Since: 4.12
+ */
+void
+gtk_grid_view_set_header_factory (GtkGridView        *self,
+                                  GtkListItemFactory *factory)
+{
+  gboolean had_sections;
+
+  g_return_if_fail (GTK_IS_GRID_VIEW (self));
+  g_return_if_fail (factory == NULL || GTK_IS_LIST_ITEM_FACTORY (factory));
+
+  had_sections = gtk_list_item_manager_get_has_sections (self->item_manager);
+
+  if (!g_set_object (&self->header_factory, factory))
+    return;
+
+  gtk_list_item_manager_set_has_sections (self->item_manager, factory != NULL);
+
+  if (!gtk_grid_view_is_inert (self) &&
+      had_sections && gtk_list_item_manager_get_has_sections (self->item_manager))
+    {
+      GtkListTile *tile;
+
+      for (tile = gtk_list_item_manager_get_first (self->item_manager);
+           tile != NULL;
+           tile = gtk_rb_tree_node_get_next (tile))
+        {
+          if (tile->widget && tile->type == GTK_LIST_TILE_HEADER)
+            gtk_list_header_widget_set_factory (GTK_LIST_HEADER_WIDGET (tile->widget), factory);
+        }
+    }
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_HEADER_FACTORY]);
+}
+
 /**
  * gtk_grid_view_get_max_columns: (attributes org.gtk.Method.get_property=max-columns)
  * @self: a `GtkGridView`

gtk/gtkgridview.h

@@ -56,6 +56,14 @@ void            gtk_grid_view_set_factory                       (GtkGridView
 GDK_AVAILABLE_IN_ALL
 GtkListItemFactory *
                 gtk_grid_view_get_factory                       (GtkGridView            *self);
+
+GDK_AVAILABLE_IN_4_12
+void            gtk_grid_view_set_header_factory                (GtkGridView            *self,
+                                                                 GtkListItemFactory     *factory);
+GDK_AVAILABLE_IN_4_12
+GtkListItemFactory *
+                gtk_grid_view_get_header_factory                (GtkGridView            *self);
+
 GDK_AVAILABLE_IN_ALL
 guint           gtk_grid_view_get_min_columns                   (GtkGridView            *self);
 GDK_AVAILABLE_IN_ALL

gtk/gtkgridviewprivate.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright © 2023 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * 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/>.
+ */
+
+
+#pragma once
+
+#include "gtk/gtktypes.h"
+#include "gtk/gtkenums.h"
+#include "gtk/gtkgridview.h"
+#include "gtk/gtklistitemmanagerprivate.h"
+
+G_BEGIN_DECLS
+
+unsigned int gtk_grid_view_get_column_for_position (GtkListItemManager *items,
+                                                    unsigned int        n_columns,
+                                                    unsigned int        position);
+
+gboolean     gtk_grid_view_is_multirow_tile        (GtkListItemManager *items,
+                                                    unsigned int        n_columns,
+                                                    GtkListTile        *tile);
+
+
+void         gtk_grid_view_split_tiles_by_columns  (GtkListItemManager *items,
+                                                    guint               n_columns);
+
+G_END_DECLS

gtk/gtklistbase.c

@@ -39,6 +39,8 @@
 #include "gtktypebuiltins.h"
 #include "gtkwidgetprivate.h"
 
+#include <gdk/gdkrgbaprivate.h>
+
 /* Allow shadows to overdraw without immediately culling the widget at the viewport
  * boundary.
  * Choose this so that roughly 1 extra widget gets drawn on each side of the viewport,
@@ -1142,6 +1144,124 @@ gtk_list_base_move_cursor (GtkWidget *widget,
   return TRUE;
 }
 
+GskRenderNode *
+gtk_list_base_dump_tiles (GtkListBase *self)
+{
+  GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
+  GtkSnapshot *snapshot;
+  GtkListTile *tile;
+  cairo_rectangle_int_t viewport;
+  guint i, focus, anchor, selected;
+  PangoLayout *layout;
+  char *s;
+
+  focus = gtk_list_base_get_focus_position (self);
+  anchor = gtk_list_base_get_anchor (self);
+  selected = gtk_list_item_tracker_get_position (priv->item_manager, priv->selected);
+
+  snapshot = gtk_snapshot_new ();
+
+  i = 0;
+  for (tile = gtk_list_item_manager_get_first (priv->item_manager);
+       tile != NULL;
+       tile = gtk_rb_tree_node_get_next (tile))
+    {
+      if (tile->widget)
+        {
+          GdkRGBA color;
+          if (gtk_list_tile_is_header (tile))
+            color = GDK_RGBA("FF00FF");
+          else if (i == focus)
+            color = GDK_RGBA("00FF00");
+          else if (i == anchor)
+            color = GDK_RGBA("FFFF00");
+          else if (i == selected)
+            color = GDK_RGBA("0000FF");
+          else
+            color = GDK_RGBA("FFFFFF");
+
+          gtk_snapshot_append_color (snapshot,
+                                     &color,
+                                     &GRAPHENE_RECT_INIT(
+                                       tile->area.x, tile->area.y,
+                                       tile->area.width, tile->area.height
+                                     ));
+
+          /* This should really look at the ListItem */
+          s = g_strdup_printf ("%u", i);
+          layout = gtk_widget_create_pango_layout (GTK_WIDGET (self), s);
+          gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (tile->area.x + 2, tile->area.y + 2));
+          gtk_snapshot_append_layout (snapshot, layout, &GDK_RGBA("000000"));
+          gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (- tile->area.x - 2, - tile->area.y - 2));
+          g_object_unref (layout);
+          g_free (s);
+        }
+      else
+        {
+          GdkRGBA color;
+
+          if (gtk_list_tile_is_footer (tile))
+            color = GDK_RGBA("800080");
+          if (tile->n_items == 0)
+            color = GDK_RGBA("A07070");
+          else
+            color = GDK_RGBA("808080");
+          gtk_snapshot_append_color (snapshot,
+                                     &color,
+                                     &GRAPHENE_RECT_INIT(
+                                       tile->area.x, tile->area.y,
+                                       tile->area.width, tile->area.height
+                                     ));
+        }
+
+      gtk_snapshot_append_border (snapshot,
+                                  &GSK_ROUNDED_RECT_INIT(
+                                    tile->area.x, tile->area.y,
+                                    tile->area.width, tile->area.height
+                                  ),
+                                  (float[4]) { 1, 1, 1, 1 },
+                                  (GdkRGBA[4]) { GDK_RGBA("000000"), GDK_RGBA("000000"), GDK_RGBA("000000"), GDK_RGBA("000000") });
+
+      i += tile->n_items;
+    }
+
+  gtk_list_base_get_adjustment_values (GTK_LIST_BASE (self),
+                                       gtk_list_base_get_orientation (GTK_LIST_BASE (self)),
+                                       &viewport.y, NULL, &viewport.height);
+  gtk_list_base_get_adjustment_values (GTK_LIST_BASE (self),
+                                       gtk_list_base_get_opposite_orientation (GTK_LIST_BASE (self)),
+                                       &viewport.x, NULL, &viewport.width);
+  gtk_snapshot_append_color (snapshot,
+                             &GDK_RGBA("0000F040"),
+                             &GRAPHENE_RECT_INIT(
+                               viewport.x, viewport.y,
+                               viewport.width, viewport.height
+                             ));
+  
+
+  return gtk_snapshot_free_to_node (snapshot);
+}
+
+static gboolean
+gtk_list_base_copy_tiles_to_clipboard (GtkWidget *widget,
+                                       GVariant  *args,
+                                       gpointer   unused)
+{
+  GtkListBase *self = GTK_LIST_BASE (widget);
+  GskRenderNode *node;
+
+  node = gtk_list_base_dump_tiles (self);
+  if (node == NULL)
+    return TRUE;
+
+  gdk_clipboard_set (gtk_widget_get_clipboard (widget),
+                     GSK_TYPE_RENDER_NODE,
+                     node);
+  gsk_render_node_unref (node);
+
+  return TRUE;
+}
+
 static void
 gtk_list_base_add_move_binding (GtkWidgetClass *widget_class,
                                 guint           keyval,
@@ -1320,6 +1440,8 @@ gtk_list_base_class_init (GtkListBaseClass *klass)
   gtk_widget_class_add_binding_action (widget_class, GDK_KEY_slash, GDK_CONTROL_MASK, "list.select-all", NULL);
   gtk_widget_class_add_binding_action (widget_class, GDK_KEY_A, GDK_CONTROL_MASK | GDK_SHIFT_MASK, "list.unselect-all", NULL);
   gtk_widget_class_add_binding_action (widget_class, GDK_KEY_backslash, GDK_CONTROL_MASK, "list.unselect-all", NULL);
+
+  gtk_widget_class_add_binding (widget_class, GDK_KEY_R, GDK_CONTROL_MASK | GDK_SHIFT_MASK, gtk_list_base_copy_tiles_to_clipboard, NULL);
 }
 
 static gboolean

gtk/gtklistbaseprivate.h

@@ -95,3 +95,5 @@ GtkListTabBehavior     gtk_list_base_get_tab_behavior           (GtkListBase
 
 void                   gtk_list_base_allocate                   (GtkListBase            *self);
 
+GskRenderNode         *gtk_list_base_dump_tiles                 (GtkListBase            *self);
+

tests/meson.build

@@ -1,5 +1,6 @@
 gtk_tests = [
   # testname, optional extra sources
+  ['testsections'],
   ['testfilelauncher'],
   ['input'],
   ['testpopup'],

tests/testsections.c

@@ -0,0 +1,317 @@
+#include <gtk/gtk.h>
+
+static void
+setup_item (GtkSignalListItemFactory *self,
+            GObject                  *object)
+{
+  GtkListItem *list_item = GTK_LIST_ITEM (object);
+  GtkWidget *child = gtk_label_new ("");
+
+  gtk_label_set_xalign (GTK_LABEL (child), 0);
+  gtk_list_item_set_child (list_item, child);
+}
+
+static void
+bind_item (GtkSignalListItemFactory *self,
+           GObject                  *object)
+{
+  GtkListItem *list_item = GTK_LIST_ITEM (object);
+  GObject *item = gtk_list_item_get_item (list_item);
+  GtkWidget *child = gtk_list_item_get_child (list_item);
+
+  gtk_label_set_label (GTK_LABEL (child),
+                       gtk_string_object_get_string (GTK_STRING_OBJECT (item)));
+}
+
+static void
+setup_header (GtkSignalListItemFactory *self,
+              GObject                  *object)
+{
+  GtkListHeader *header = GTK_LIST_HEADER (object);
+  GtkWidget *child = gtk_label_new ("");
+
+  gtk_label_set_xalign (GTK_LABEL (child), 0);
+  gtk_list_header_set_child (header, child);
+}
+
+static char *
+get_first (GObject *this)
+{
+  const char *s = gtk_string_object_get_string (GTK_STRING_OBJECT (this));
+  char buffer[6] = { 0, };
+
+  g_unichar_to_utf8 (g_unichar_toupper (g_utf8_get_char (s)), buffer);
+
+  return g_strdup (buffer);
+}
+
+static void
+bind_header (GtkSignalListItemFactory *self,
+             GObject                  *object)
+{
+  GtkListHeader *header = GTK_LIST_HEADER (object);
+  GObject *item = gtk_list_header_get_item (header);
+  GtkWidget *child = gtk_list_header_get_child (header);
+  PangoAttrList *attrs;
+  char *string;
+
+  string = get_first (item);
+
+  gtk_label_set_label (GTK_LABEL (child), string);
+  attrs = pango_attr_list_new ();
+  pango_attr_list_insert (attrs, pango_attr_scale_new (PANGO_SCALE_X_LARGE));
+  pango_attr_list_insert (attrs, pango_attr_weight_new (PANGO_WEIGHT_BOLD));
+  gtk_label_set_attributes (GTK_LABEL (child), attrs);
+  pango_attr_list_unref (attrs);
+  g_free (string);
+}
+
+static const char *strings[] = {
+  "Alpha", "Andromeda", "Anaphylaxis", "Anaheim", "Beer", "Branch", "Botulism", "Banana",
+  "Bee", "Crane", "Caldera", "Copper", "Crowd", "Dora", "Dolphin", "Dam", "Ding",
+ NULL,
+};
+
+gboolean done_reading = FALSE;
+
+static gboolean
+dump_sections (gpointer data)
+{
+  GtkSectionModel *model = data;
+
+  if (!done_reading)
+    return G_SOURCE_CONTINUE;
+
+  for (unsigned int i = 0; i < g_list_model_get_n_items (G_LIST_MODEL (model)); i++)
+    {
+      unsigned int s, e;
+      gtk_section_model_get_section (model, i, &s, &e);
+      g_print ("(%u %u)\n", s, e - 1);
+      i = e;
+    }
+
+  return G_SOURCE_REMOVE;
+}
+
+
+static void
+read_lines_cb (GObject      *object,
+               GAsyncResult *result,
+               gpointer      data)
+{
+  GBufferedInputStream *stream = G_BUFFERED_INPUT_STREAM (object);
+  GtkStringList *stringlist = data;
+  GError *error = NULL;
+  gsize size;
+  GPtrArray *lines;
+  gssize n_filled;
+  const char *buffer, *newline;
+
+  n_filled = g_buffered_input_stream_fill_finish (stream, result, &error);
+  if (n_filled < 0)
+    {
+      g_print ("Could not read data: %s\n", error->message);
+      g_clear_error (&error);
+      g_object_unref (stringlist);
+      return;
+    }
+
+  buffer = g_buffered_input_stream_peek_buffer (stream, &size);
+
+  if (n_filled == 0)
+    {
+      if (size)
+        gtk_string_list_take (stringlist, g_utf8_make_valid (buffer, size));
+      g_object_unref (stringlist);
+      done_reading = TRUE;
+      return;
+    }
+
+  lines = NULL;
+  while ((newline = memchr (buffer, '\n', size)))
+    {
+      if (newline > buffer)
+        {
+          if (lines == NULL)
+            lines = g_ptr_array_new_with_free_func (g_free);
+          g_ptr_array_add (lines, g_utf8_make_valid (buffer, newline - buffer));
+        }
+      if (g_input_stream_skip (G_INPUT_STREAM (stream), newline - buffer + 1, NULL, &error) < 0)
+        {
+          g_clear_error (&error);
+          break;
+        }
+      buffer = g_buffered_input_stream_peek_buffer (stream, &size);
+    }
+  if (lines == NULL)
+    {
+      g_buffered_input_stream_set_buffer_size (stream, g_buffered_input_stream_get_buffer_size (stream) + 4096);
+    }
+  else
+    {
+      g_ptr_array_add (lines, NULL);
+      gtk_string_list_splice (stringlist, g_list_model_get_n_items (G_LIST_MODEL (stringlist)), 0, (const char **) lines->pdata);
+      g_ptr_array_free (lines, TRUE);
+    }
+
+  g_buffered_input_stream_fill_async (stream, -1, G_PRIORITY_HIGH_IDLE, NULL, read_lines_cb, data);
+}
+
+static void
+file_is_open_cb (GObject      *file,
+                 GAsyncResult *result,
+                 gpointer      data)
+{
+  GError *error = NULL;
+  GFileInputStream *file_stream;
+  GBufferedInputStream *stream;
+
+  file_stream = g_file_read_finish (G_FILE (file), result, &error);
+  if (file_stream == NULL)
+    {
+      g_print ("Could not open file: %s\n", error->message);
+      g_error_free (error);
+      g_object_unref (data);
+      return;
+    }
+
+  stream = G_BUFFERED_INPUT_STREAM (g_buffered_input_stream_new (G_INPUT_STREAM (file_stream)));
+  g_buffered_input_stream_fill_async (stream, -1, G_PRIORITY_HIGH_IDLE, NULL, read_lines_cb, data);
+  g_object_unref (stream);
+}
+
+static void
+load_file (GtkStringList *list,
+           GFile         *file)
+{
+  gtk_string_list_splice (list, 0, g_list_model_get_n_items (G_LIST_MODEL (list)), NULL);
+  g_file_read_async (file, G_PRIORITY_HIGH_IDLE, NULL, file_is_open_cb, g_object_ref (list));
+}
+
+static void
+toggle_cb (GtkCheckButton *check, GtkWidget *list)
+{
+  GtkListItemFactory *header_factory = NULL;
+
+  if (gtk_check_button_get_active (check))
+    {
+      header_factory = gtk_signal_list_item_factory_new ();
+      g_signal_connect (header_factory, "setup", G_CALLBACK (setup_header), NULL);
+      g_signal_connect (header_factory, "bind", G_CALLBACK (bind_header), NULL);
+    }
+
+  if (GTK_IS_LIST_VIEW (list))
+    gtk_list_view_set_header_factory (GTK_LIST_VIEW (list), header_factory);
+  else
+    gtk_grid_view_set_header_factory (GTK_GRID_VIEW (list), header_factory);
+
+  g_clear_object (&header_factory);
+}
+
+static void
+value_changed_cb (GtkAdjustment *adj, gpointer data)
+{
+  g_print ("horizontal adjustment changed to %f\n",  gtk_adjustment_get_value (adj));
+}
+
+int
+main (int argc, char *argv[])
+{
+  GtkWidget *window;
+  GtkWidget *sw;
+  GtkWidget *lv;
+  GtkWidget *gv;
+  GtkWidget *header;
+  GtkWidget *toggle;
+  GtkWidget *switcher;
+  GtkWidget *stack;
+  GtkListItemFactory *factory;
+  GtkExpression *expression;
+  GtkSortListModel *sortmodel;
+  GtkSelectionModel *selection;
+  GtkStringList *stringlist;
+  GtkAdjustment *adj;
+
+  stringlist = gtk_string_list_new (NULL);
+
+  if (argc > 1)
+    {
+      GFile *file = g_file_new_for_commandline_arg (argv[1]);
+      load_file (stringlist, file);
+      g_object_unref (file);
+    }
+  else
+    {
+      for (int i = 0; strings[i]; i++)
+        gtk_string_list_append (stringlist, strings[i]);
+      done_reading = TRUE;
+    }
+
+  gtk_init ();
+
+  window = gtk_window_new ();
+  gtk_window_set_default_size (GTK_WINDOW (window), 800, 600);
+
+  header = gtk_header_bar_new ();
+  gtk_window_set_titlebar (GTK_WINDOW (window), header);
+
+  toggle = gtk_check_button_new ();
+  gtk_widget_set_valign (toggle, GTK_ALIGN_CENTER);
+  gtk_header_bar_pack_start (GTK_HEADER_BAR (header), toggle);
+
+  stack = gtk_stack_new ();
+  gtk_window_set_child (GTK_WINDOW (window), stack);
+
+  switcher = gtk_stack_switcher_new ();
+  gtk_header_bar_set_title_widget (GTK_HEADER_BAR (header), switcher);
+
+  gtk_stack_switcher_set_stack (GTK_STACK_SWITCHER (switcher), GTK_STACK (stack));
+
+  expression = gtk_property_expression_new (GTK_TYPE_STRING_OBJECT, NULL, "string");
+  sortmodel = gtk_sort_list_model_new (G_LIST_MODEL (stringlist),
+                                       GTK_SORTER (gtk_string_sorter_new (expression)));
+  expression = gtk_cclosure_expression_new (G_TYPE_STRING, NULL, 0, NULL, (GCallback) get_first, NULL, NULL);
+  gtk_sort_list_model_set_section_sorter (sortmodel, GTK_SORTER (gtk_string_sorter_new (expression)));
+  selection = GTK_SELECTION_MODEL (gtk_no_selection_new (G_LIST_MODEL (sortmodel)));
+
+  sw = gtk_scrolled_window_new ();
+  gtk_stack_add_titled (GTK_STACK (stack), sw, "list", "List");
+
+  factory = gtk_signal_list_item_factory_new ();
+  g_signal_connect (factory, "setup", G_CALLBACK (setup_item), NULL);
+  g_signal_connect (factory, "bind", G_CALLBACK (bind_item), NULL);
+
+  lv = gtk_list_view_new (g_object_ref (selection), factory);
+  gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), lv);
+
+  g_signal_connect (toggle, "toggled", G_CALLBACK (toggle_cb), lv);
+
+  sw = gtk_scrolled_window_new ();
+  gtk_stack_add_titled (GTK_STACK (stack), sw, "grid", "Grid");
+
+  factory = gtk_signal_list_item_factory_new ();
+  g_signal_connect (factory, "setup", G_CALLBACK (setup_item), NULL);
+  g_signal_connect (factory, "bind", G_CALLBACK (bind_item), NULL);
+
+  gv = gtk_grid_view_new (g_object_ref (selection), factory);
+  gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), gv);
+
+  g_signal_connect (toggle, "toggled", G_CALLBACK (toggle_cb), gv);
+
+  gtk_grid_view_set_min_columns (GTK_GRID_VIEW (gv), 5);
+
+  adj = gtk_scrolled_window_get_hadjustment (GTK_SCROLLED_WINDOW (sw));
+  g_signal_connect (adj, "value-changed", G_CALLBACK (value_changed_cb), NULL);
+
+  gtk_window_present (GTK_WINDOW (window));
+
+  g_timeout_add (500, dump_sections, selection);
+
+  while (g_list_model_get_n_items (gtk_window_get_toplevels ()) > 0)
+    g_main_context_iteration (NULL, FALSE);
+
+  g_object_unref (selection);
+  g_object_unref (stringlist);
+
+  return 0;
+}

testsuite/gtk/listitemmanager.c

@@ -20,6 +20,7 @@
 #include <gtk/gtk.h>
 #include "gtk/gtklistitemmanagerprivate.h"
 #include "gtk/gtklistbaseprivate.h"
+#include "gtk/gtkgridviewprivate.h"
 
 static GListModel *
 create_source_model (guint min_size, guint max_size)
@@ -374,7 +375,43 @@ print_changes_cb (GListModel *model,
 }
 
 static void
-test_exhaustive (void)
+check_column_tile_invariants (GtkListItemManager *items,
+                              unsigned int        n_columns)
+{
+  GtkListTile *tile;
+
+  for (tile = gtk_list_item_manager_get_first (items);
+       tile != NULL;
+       tile = gtk_rb_tree_node_get_next (tile))
+    {
+      g_assert (tile->type != GTK_LIST_TILE_REMOVED);
+      if (tile->n_items > 1)
+        {
+          unsigned int pos, col;
+
+          pos = gtk_list_tile_get_position (items, tile);
+          col = gtk_grid_view_get_column_for_position (items, n_columns, pos);
+
+          if (gtk_grid_view_is_multirow_tile (items, n_columns, tile))
+            g_assert_true (col == 0);
+          else
+            g_assert_true (col + tile->n_items - 1 <= n_columns);
+        }
+    }
+}
+static void
+check_grid_view (GtkListItemManager *items)
+{
+  for (unsigned int n_columns = 1; n_columns < 10; n_columns++)
+    {
+      gtk_list_item_manager_gc_tiles (items);
+      gtk_grid_view_split_tiles_by_columns (items, n_columns);
+      check_column_tile_invariants (items, n_columns);
+    }
+}
+
+static void
+test_exhaustive (gboolean grid)
 {
   GtkListItemTracker *trackers[N_TRACKERS];
   GListStore *store;
@@ -484,7 +521,10 @@ test_exhaustive (void)
         }
     }
 
-  check_list_item_manager (items, trackers, N_TRACKERS);
+  if (grid)
+    check_grid_view (items);
+  else
+    check_list_item_manager (items, trackers, N_TRACKERS);
 
   for (i = 0; i < N_TRACKERS; i++)
     gtk_list_item_tracker_free (items, trackers[i]);
@@ -492,6 +532,18 @@ test_exhaustive (void)
   gtk_window_destroy (GTK_WINDOW (widget));
 }
 
+static void
+test_exhaustive_list (void)
+{
+  test_exhaustive (FALSE);
+}
+
+static void
+test_exhaustive_grid (void)
+{
+  test_exhaustive (TRUE);
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -499,7 +551,8 @@ main (int argc, char *argv[])
 
   g_test_add_func ("/listitemmanager/create", test_create);
   g_test_add_func ("/listitemmanager/create_with_items", test_create_with_items);
-  g_test_add_func ("/listitemmanager/exhaustive", test_exhaustive);
+  g_test_add_func ("/listitemmanager/exhaustive", test_exhaustive_list);
+  g_test_add_func ("/gridview/split", test_exhaustive_grid);
 
   return g_test_run ();
 }