pathbar: copy implementation of an event window from the GTK copy

In order to listen for scroll events on the whole pathbar area, we need
to create an event window in realize(), created with GDK_SCROLL_MASK.
Copy the code from GtkPathBar that implements this.

2 files changed, 66 insertions, 0 deletions

diff --git a/src/nautilus-pathbar.c b/src/nautilus-pathbar.c
index fe7f33b40..bb1d680e8 100644
--- a/src/nautilus-pathbar.c
+++ b/src/nautilus-pathbar.c
@@ -467,10 +467,19 @@ static void
 nautilus_path_bar_unmap (GtkWidget *widget)
 {
 	nautilus_path_bar_stop_scrolling (NAUTILUS_PATH_BAR (widget));
+	gdk_window_hide (NAUTILUS_PATH_BAR (widget)->event_window);
 
 	GTK_WIDGET_CLASS (nautilus_path_bar_parent_class)->unmap (widget);
 }
 
+static void
+nautilus_path_bar_map (GtkWidget *widget)
+{
+	gdk_window_show (NAUTILUS_PATH_BAR (widget)->event_window);
+
+	GTK_WIDGET_CLASS (nautilus_path_bar_parent_class)->map (widget);
+}
+
 /* This is a tad complicated */
 static void
 nautilus_path_bar_size_allocate (GtkWidget     *widget,
@@ -496,6 +505,12 @@ nautilus_path_bar_size_allocate (GtkWidget     *widget,
 
 	gtk_widget_set_allocation (widget, allocation);
 
+	if (gtk_widget_get_realized (widget)) {
+		gdk_window_move_resize (path_bar->event_window,
+					allocation->x, allocation->y,
+					allocation->width, allocation->height);
+	}
+
         /* No path is set so we don't have to allocate anything. */
         if (path_bar->button_list == NULL) {
                 return;
@@ -726,6 +741,52 @@ nautilus_path_bar_scroll (GtkWidget      *widget,
 	return FALSE;
 }
 
+static void
+nautilus_path_bar_realize (GtkWidget *widget)
+{
+	NautilusPathBar *path_bar;
+	GtkAllocation allocation;
+	GdkWindow *window;
+	GdkWindowAttr attributes;
+	gint attributes_mask;
+
+	gtk_widget_set_realized (widget, TRUE);
+
+	path_bar = NAUTILUS_PATH_BAR (widget);
+	window = gtk_widget_get_parent_window (widget);
+	gtk_widget_set_window (widget, window);
+	g_object_ref (window);
+
+	gtk_widget_get_allocation (widget, &allocation);
+
+	attributes.window_type = GDK_WINDOW_CHILD;
+	attributes.x = allocation.x;
+	attributes.y = allocation.y;
+	attributes.width = allocation.width;
+	attributes.height = allocation.height;
+	attributes.wclass = GDK_INPUT_ONLY;
+	attributes.event_mask = gtk_widget_get_events (widget);
+	attributes.event_mask |= GDK_SCROLL_MASK;
+	attributes_mask = GDK_WA_X | GDK_WA_Y;
+
+	path_bar->event_window = gdk_window_new (gtk_widget_get_parent_window (widget),
+						 &attributes, attributes_mask);
+	gdk_window_set_user_data (path_bar->event_window, widget);
+}
+
+static void
+nautilus_path_bar_unrealize (GtkWidget *widget)
+{
+	NautilusPathBar *path_bar;
+
+	path_bar = NAUTILUS_PATH_BAR (widget);
+
+	gdk_window_set_user_data (path_bar->event_window, NULL);
+	gdk_window_destroy (path_bar->event_window);
+	path_bar->event_window = NULL;
+
+	GTK_WIDGET_CLASS (nautilus_path_bar_parent_class)->unrealize (widget);
+}
 
 static void
 nautilus_path_bar_add (GtkContainer *container,
@@ -841,7 +902,10 @@ nautilus_path_bar_class_init (NautilusPathBarClass *path_bar_class)
 
 	widget_class->get_preferred_height = nautilus_path_bar_get_preferred_height;
 	widget_class->get_preferred_width = nautilus_path_bar_get_preferred_width;
+	widget_class->realize = nautilus_path_bar_realize;
+	widget_class->unrealize = nautilus_path_bar_unrealize;
 	widget_class->unmap = nautilus_path_bar_unmap;
+	widget_class->map = nautilus_path_bar_map;
         widget_class->size_allocate = nautilus_path_bar_size_allocate;
         widget_class->style_updated = nautilus_path_bar_style_updated;
         widget_class->screen_changed = nautilus_path_bar_screen_changed;
diff --git a/src/nautilus-pathbar.h b/src/nautilus-pathbar.h
index a4bb928f4..bb96b9cb8 100644
--- a/src/nautilus-pathbar.h
+++ b/src/nautilus-pathbar.h
@@ -38,6 +38,8 @@ typedef struct _NautilusPathBarClass NautilusPathBarClass;
 struct _NautilusPathBar
 {
 	GtkContainer parent;
+
+	GdkWindow *event_window;
  
 	GFile *root_path;
 	GFile *home_path;