[nautilus] pathbar: add clip hack to buttons

[Cosimo Cecchi <cosimoc src gnome org>]

commit 1a05544bf0eb59928d911bf66a7bbf1d1bf7cc0d
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Wed Sep 3 15:09:26 2014 -0700

    pathbar: add clip hack to buttons
    
    Not very pretty, but this is the best we can do right now with public
    API...

 src/nautilus-pathbar.c |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)
---
diff --git a/src/nautilus-pathbar.c b/src/nautilus-pathbar.c
index 4893a59..a0eed27 100644
--- a/src/nautilus-pathbar.c
+++ b/src/nautilus-pathbar.c
@@ -437,6 +437,35 @@ nautilus_path_bar_map (GtkWidget *widget)
        GTK_WIDGET_CLASS (nautilus_path_bar_parent_class)->map (widget);
 }
 
+#define BUTTON_BOTTOM_SHADOW 1
+
+static void
+union_with_clip (GtkWidget *widget,
+                 gpointer   clip)
+{
+       GtkAllocation widget_clip;
+
+       if (!gtk_widget_is_drawable (widget)) {
+               return;
+       }
+
+       gtk_widget_get_clip (widget, &widget_clip);
+
+       gdk_rectangle_union (&widget_clip, clip, clip);
+}
+
+static void
+_set_simple_bottom_clip (GtkWidget *widget,
+                        gint pixels)
+{
+       GtkAllocation clip;
+
+       gtk_widget_get_allocation (widget, &clip);
+       clip.height += pixels;
+
+       gtk_container_forall (GTK_CONTAINER (widget), union_with_clip, &clip);
+       gtk_widget_set_clip (widget, &clip);
+}
 
 static void
 child_ordering_changed (NautilusPathBar *path_bar)
@@ -489,6 +518,7 @@ nautilus_path_bar_size_allocate (GtkWidget     *widget,
 
         /* No path is set so we don't have to allocate anything. */
         if (path_bar->priv->button_list == NULL) {
+               _set_simple_bottom_clip (widget, BUTTON_BOTTOM_SHADOW);
                 return;
        }
         direction = gtk_widget_get_direction (widget);
@@ -661,6 +691,8 @@ nautilus_path_bar_size_allocate (GtkWidget     *widget,
        if (needs_reorder) {
                child_ordering_changed (path_bar);
        }
+
+       _set_simple_bottom_clip (widget, BUTTON_BOTTOM_SHADOW);
 }
 
 static void