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 FocusStoreGtk()11FocusStoreGtk::FocusStoreGtk() 12 : widget_(NULL), 13 destroy_handler_id_(0) { 14 } 15 ~FocusStoreGtk()16FocusStoreGtk::~FocusStoreGtk() { 17 DisconnectDestroyHandler(); 18 } 19 Store(GtkWidget * widget)20void 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 SetWidget(GtkWidget * widget)34void 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 DisconnectDestroyHandler()48void FocusStoreGtk::DisconnectDestroyHandler() { 49 if (widget_) { 50 g_signal_handler_disconnect(widget_, destroy_handler_id_); 51 widget_ = NULL; 52 } 53 } 54 55 } // namespace ui 56