Use drag-motion in the arrow buttons to scroll when hovering

Code copied from Nautilus.  I think we'll have to tweak the timers a bit;
they seem a bit short right now.

gtk/Makefile.am

@@ -295,6 +295,7 @@ gtk_public_h_sources = 		\
 	gtkpagesetup.h		\
 	gtkpaned.h		\
 	gtkpapersize.h		\
+	gtkpathbar.h		\
 	gtkplacessidebar.h	\
 	gtkplug.h		\
 	gtkprintcontext.h	\
@@ -514,7 +515,6 @@ gtk_private_h_sources =		\
 	gtknumerableiconprivate.h \
 	gtkorientableprivate.h	\
 	gtkpango.h		\
-	gtkpathbar.h		\
 	gtkpressandholdprivate.h \
 	gtkprintoperation-private.h \
 	gtkprintutils.h		\

gtk/gtk.h

@@ -145,6 +145,7 @@
 #include <gtk/gtkpagesetup.h>
 #include <gtk/gtkpapersize.h>
 #include <gtk/gtkpaned.h>
+#include <gtk/gtkpathbar.h>
 #include <gtk/gtkplacessidebar.h>
 #include <gtk/gtkprintcontext.h>
 #include <gtk/gtkprintoperation.h>

gtk/gtkfilechooserdefault.c

@@ -504,11 +504,11 @@ static void list_row_activated         (GtkTreeView           *tree_view,
 					GtkTreeViewColumn     *column,
 					GtkFileChooserDefault *impl);
 
-static void path_bar_clicked (GtkPathBar            *path_bar,
+static void path_bar_open_location_cb (GtkPathBar            *path_bar,
-			      GFile                 *file,
+				       GFile                 *file,
-			      GFile                 *child,
+				       GFile                 *child,
-                              gboolean               child_is_hidden,
+				       gboolean               child_is_hidden,
-                              GtkFileChooserDefault *impl);
+				       GtkFileChooserDefault *impl);
 
 static void update_cell_renderer_attributes (GtkFileChooserDefault *impl);
 
@@ -2522,7 +2522,7 @@ put_recent_folder_in_pathbar (GtkFileChooserDefault *impl, GtkTreeIter *iter)
   gtk_tree_model_get (GTK_TREE_MODEL (priv->recent_model), iter,
 		      MODEL_COL_FILE, &file,
 		      -1);
-  _gtk_path_bar_set_file (GTK_PATH_BAR (priv->browse_path_bar), file, FALSE);
+  gtk_path_bar_set_location (GTK_PATH_BAR (priv->browse_path_bar), file, FALSE);
   g_object_unref (file);
 }
 
@@ -4615,7 +4615,7 @@ update_current_folder_get_info_cb (GCancellable *cancellable,
   if (! _gtk_file_info_consider_as_directory (info))
     goto out;
 
-  _gtk_path_bar_set_file (GTK_PATH_BAR (priv->browse_path_bar), data->file, data->keep_trail);
+  gtk_path_bar_set_location (GTK_PATH_BAR (priv->browse_path_bar), data->file, data->keep_trail);
 
   if (priv->current_folder != data->file)
     {
@@ -7014,11 +7014,11 @@ list_row_activated (GtkTreeView           *tree_view,
 }
 
 static void
-path_bar_clicked (GtkPathBar            *path_bar,
+path_bar_open_location_cb (GtkPathBar            *path_bar,
-		  GFile                 *file,
+			   GFile                 *file,
-		  GFile                 *child_file,
+			   GFile                 *child_file,
-		  gboolean               child_is_hidden,
+			   gboolean               child_is_hidden,
-		  GtkFileChooserDefault *impl)
+			   GtkFileChooserDefault *impl)
 {
   if (child_file)
     pending_select_files_add (impl, child_file);
@@ -7507,7 +7507,7 @@ _gtk_file_chooser_default_class_init (GtkFileChooserDefaultClass *class)
   gtk_widget_class_bind_callback (widget_class, filter_combo_changed);
   gtk_widget_class_bind_callback (widget_class, location_button_toggled_cb);
   gtk_widget_class_bind_callback (widget_class, new_folder_button_clicked);
-  gtk_widget_class_bind_callback (widget_class, path_bar_clicked);
+  gtk_widget_class_bind_callback (widget_class, path_bar_open_location_cb);
   gtk_widget_class_bind_callback (widget_class, places_sidebar_open_location_cb);
   gtk_widget_class_bind_callback (widget_class, places_sidebar_show_error_message_cb);
 }

gtk/gtkfilechooserdefault.ui

@@ -79,7 +79,7 @@
                   <object class="GtkPathBar" id="browse_path_bar">
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
-                    <signal name="path-clicked" handler="path_bar_clicked" after="yes" swapped="no"/>
+                    <signal name="open-location" handler="path_bar_open_location_cb" after="yes" swapped="no"/>
                   </object>
                   <packing>
                     <property name="expand">True</property>

gtk/gtkpathbar.h

@@ -18,8 +18,13 @@
 #ifndef __GTK_PATH_BAR_H__
 #define __GTK_PATH_BAR_H__
 
-#include "gtkcontainer.h"
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
-#include "gtkfilesystem.h"
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtkcontainer.h>
+#include <gtk/gtkfilesystem.h>
+#include <gtk/gtkplacessidebar.h>
 
 G_BEGIN_DECLS
 
@@ -46,18 +51,26 @@ struct _GtkPathBarClass
 {
   GtkContainerClass parent_class;
 
-  void (* path_clicked) (GtkPathBar  *path_bar,
+  void (* open_location) (GtkPathBar  *path_bar,
-			 GFile       *file,
+			  GFile       *file,
-			 GFile       *child_file,
+			  GFile       *child_file,
-			 gboolean     child_is_hidden);
+			  gboolean     child_is_hidden);
 };
 
 GType    gtk_path_bar_get_type (void) G_GNUC_CONST;
+
+GtkWidget *gtk_path_bar_new (void);
+
+GtkPlacesOpenFlags gtk_path_bar_get_open_flags (GtkPathBar *path_bar);
+void gtk_path_bar_set_open_flags (GtkPathBar *path_bar, GtkPlacesOpenFlags flags);
+
+void gtk_path_bar_set_location (GtkPathBar *path_bar,
+				GFile      *location,
+				gboolean    keep_trail);
+GFile *gtk_path_bar_get_location (GtkPathBar *path_bar);
+
 void     _gtk_path_bar_set_file_system (GtkPathBar         *path_bar,
 					GtkFileSystem      *file_system);
-void     _gtk_path_bar_set_file        (GtkPathBar         *path_bar,
-					GFile              *file,
-					gboolean            keep_trail);
 void     _gtk_path_bar_up              (GtkPathBar *path_bar);
 void     _gtk_path_bar_down            (GtkPathBar *path_bar);