ui/base/gtk/focus_store_gtk.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 "ui/base/gtk/focus_store_gtk.h"
   6
   7 #include <gtk/gtk.h>
   8
   9 namespace ui {
  10
  11 FocusStoreGtk::FocusStoreGtk()
  12     : widget_(NULL),
  13       destroy_handler_id_(0) {
  14 }
  15
  16 FocusStoreGtk::~FocusStoreGtk() {
  17   DisconnectDestroyHandler();
  18 }
  19
  20 void FocusStoreGtk::Store(GtkWidget* widget) {
  21   GtkWidget* focus_widget = NULL;
  22   if (widget) {
  23     // A detached widget won't have a toplevel window as an ancestor, so we
  24     // can't assume that the query for toplevel will return a window.
  25     GtkWidget* toplevel = gtk_widget_get_ancestor(widget, GTK_TYPE_WINDOW);
  26     GtkWindow* window = GTK_IS_WINDOW(toplevel) ? GTK_WINDOW(toplevel) : NULL;
  27     if (window)
  28       focus_widget = gtk_window_get_focus(window);
  29   }
  30
  31   SetWidget(focus_widget);
  32 }
  33
  34 void FocusStoreGtk::SetWidget(GtkWidget* widget) {
  35   DisconnectDestroyHandler();
  36
  37   // We don't add a ref. The signal handler below effectively gives us a weak
  38   // reference.
  39   widget_ = widget;
  40   if (widget_) {
  41     // When invoked, |gtk_widget_destroyed| will set |widget_| to NULL.
  42     destroy_handler_id_ = g_signal_connect(widget_, "destroy",
  43                                            G_CALLBACK(gtk_widget_destroyed),
  44                                            &widget_);
  45   }
  46 }
  47
  48 void FocusStoreGtk::DisconnectDestroyHandler() {
  49   if (widget_) {
  50     g_signal_handler_disconnect(widget_, destroy_handler_id_);
  51     widget_ = NULL;
  52   }
  53 }
  54
  55 }  // namespace ui