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

chrome/common/gtk_util.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/gtk_util.h"
 
 #include <gtk/gtk.h>
 #include <gdk/gdkx.h>
 
 #include <cstdarg>
@@ skipping 78 matching lines @@
     // to be paired with a gdk_cursor_unref() so ref it here (as we own the ref
     // that comes from gdk_cursor_new().
     gdk_cursor_ref(cursor);
 
     return cursor;
   }
 
   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 {
 
 WindowOpenDisposition DispositionFromEventFlags(guint event_flags) {
   if ((event_flags & GDK_BUTTON2_MASK) || (event_flags & GDK_CONTROL_MASK)) {
     return (event_flags & GDK_SHIFT_MASK) ?
         NEW_FOREGROUND_TAB : NEW_BACKGROUND_TAB;
   }
 
@@ skipping 503 matching lines @@
 void ApplyMessageDialogQuirks(GtkWidget* dialog) {
   if (gtk_window_get_modal(GTK_WINDOW(dialog))) {
     // Work around a KDE 3 window manager bug.
     scoped_ptr<base::EnvironmentVariableGetter> env(
         base::EnvironmentVariableGetter::Create());
     if (base::DESKTOP_ENVIRONMENT_KDE3 == GetDesktopEnvironment(env.get()))
       gtk_window_set_skip_taskbar_hint(GTK_WINDOW(dialog), FALSE);
   }
 }
 
+void SuppressDefaultPainting(GtkWidget* container) {
+  g_signal_connect(container, "expose-event",
+                   G_CALLBACK(PaintNoBackground), NULL);
+}
+
 }  // namespace gtk_util