chrome/browser/ui/libgtk2ui/owned_widget_gtk2.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/libgtk2ui/owned_widget_gtk2.h"
   6
   7 #include <gtk/gtk.h>
   8
   9 #include "base/logging.h"
  10
  11 namespace libgtk2ui {
  12
  13 OwnedWidgetGtk::~OwnedWidgetGtk() {
  14   Destroy();
  15 }
  16
  17 void OwnedWidgetGtk::Own(GtkWidget* widget) {
  18   if (!widget)
  19     return;
  20
  21   DCHECK(!widget_);
  22
  23   // Keep a reference
  24   g_object_ref_sink(widget);
  25   widget_ = widget;
  26 }
  27
  28 void OwnedWidgetGtk::Destroy() {
  29   if (!widget_)
  30     return;
  31
  32   GtkWidget* widget = widget_;
  33   widget_ = NULL;
  34   gtk_widget_destroy(widget);
  35
  36   DCHECK(!g_object_is_floating(widget));
  37   // NOTE: Assumes some implementation details about glib internals.
  38   DCHECK_EQ(G_OBJECT(widget)->ref_count, 1U);
  39   g_object_unref(widget);
  40 }
  41
  42 }  // namespace libgtk2ui