GTK: hook up drag and drop of browser actions (for reordering).

The changes are propagated across open chrome windows, but are not persisted between sessions yet.

BUG=26990

Review URL: http://codereview.chromium.org/463056

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@34272 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 21 insertions, 0 deletions

diff --git a/chrome/common/gtk_util.cc b/chrome/common/gtk_util.cc
index c6c08e4..c9fce55 100644
--- a/chrome/common/gtk_util.cc
+++ b/chrome/common/gtk_util.cc
@@ -96,6 +96,22 @@ class GdkCursorCache {
   std::map<GdkCursorType, GdkCursor*> cursor_cache_;
 };
 
+// Expose event handler for a container that simply suppresses the default
+// drawing and propagates the expose event to the container's children.
+gboolean PaintNoBackground(GtkWidget* widget,
+                           GdkEventExpose* event,
+                           gpointer unused) {
+  GList* children = gtk_container_get_children(GTK_CONTAINER(widget));
+  for (GList* item = children; item; item = item->next) {
+    gtk_container_propagate_expose(GTK_CONTAINER(widget),
+                                   GTK_WIDGET(item->data),
+                                   event);
+  }
+  g_list_free(children);
+
+  return TRUE;
+}
+
 }  // namespace
 
 namespace event_utils {
@@ -619,4 +635,9 @@ void ApplyMessageDialogQuirks(GtkWidget* dialog) {
   }
 }
 
+void SuppressDefaultPainting(GtkWidget* container) {
+  g_signal_connect(container, "expose-event",
+                   G_CALLBACK(PaintNoBackground), NULL);
+}
+
 }  // namespace gtk_util