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   // We want to make sure that Own() was called properly, right after the
  23   // widget was created. There should be a floating reference.
  24   DCHECK(g_object_is_floating(widget));
  25
  26   // Sink the floating reference, we should now own this reference.
  27   g_object_ref_sink(widget);
  28   widget_ = widget;
  29 }
  30
  31 void OwnedWidgetGtk::Destroy() {
  32   if (!widget_)
  33     return;
  34
  35   GtkWidget* widget = widget_;
  36   widget_ = NULL;
  37   gtk_widget_destroy(widget);
  38
  39   DCHECK(!g_object_is_floating(widget));
  40   // NOTE: Assumes some implementation details about glib internals.
  41   DCHECK_EQ(G_OBJECT(widget)->ref_count, 1U);
  42   g_object_unref(widget);
  43 }
  44
  45 }  // namespace libgtk2ui