[nautilus] pathbar: copy implementation of an event window from the GTK copy

[Cosimo Cecchi <cosimoc src gnome org>]

commit 503443418709c9fb42af52c90c035b3957b0686e
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Mon Mar 5 11:47:25 2012 -0500

    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.

 src/nautilus-pathbar.c |   64 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/nautilus-pathbar.h |    2 +
 2 files changed, 66 insertions(+), 0 deletions(-)
---
diff --git a/src/nautilus-pathbar.c b/src/nautilus-pathbar.c
index fe7f33b..bb1d680 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 a4bb928..bb96b9c 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;