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// Copyright (c) 2012 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 "ui/base/x/root_window_property_watcher_x.h"
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include "base/memory/singleton.h"
#include "ui/base/x/active_window_watcher_x.h"
#include "ui/base/x/work_area_watcher_x.h"
namespace ui {
namespace internal {
// static
RootWindowPropertyWatcherX* RootWindowPropertyWatcherX::GetInstance() {
return Singleton<RootWindowPropertyWatcherX>::get();
}
RootWindowPropertyWatcherX::RootWindowPropertyWatcherX() {
GdkWindow* root = gdk_get_default_root_window();
// Set up X Event filter to listen for PropertyChange X events.
// Don't use XSelectInput directly here, as gdk internally seems to cache the
// mask and reapply XSelectInput after this, resetting any mask we set here.
gdk_window_set_events(root,
static_cast<GdkEventMask>(gdk_window_get_events(root) |
GDK_PROPERTY_CHANGE_MASK));
gdk_window_add_filter(root,
&RootWindowPropertyWatcherX::OnWindowXEventThunk,
this);
}
RootWindowPropertyWatcherX::~RootWindowPropertyWatcherX() {
gdk_window_remove_filter(NULL,
&RootWindowPropertyWatcherX::OnWindowXEventThunk,
this);
}
GdkFilterReturn RootWindowPropertyWatcherX::OnWindowXEvent(
GdkXEvent* xevent, GdkEvent* event) {
XEvent* xev = static_cast<XEvent*>(xevent);
if (xev->xany.type == PropertyNotify) {
if (xev->xproperty.atom == ActiveWindowWatcherX::GetPropertyAtom())
ActiveWindowWatcherX::Notify();
else if (xev->xproperty.atom == WorkAreaWatcherX::GetPropertyAtom())
WorkAreaWatcherX::Notify();
}
return GDK_FILTER_CONTINUE;
}
} // namespace internal
} // namespace ui
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