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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/active_window_watcher_x.h"
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include "base/memory/singleton.h"
#include "ui/base/x/active_window_watcher_x_observer.h"
#include "ui/base/x/root_window_property_watcher_x.h"
#include "ui/base/x/x11_util.h"
#include "ui/gfx/gdk_compat.h"
#include "ui/gfx/gtk_compat.h"
namespace ui {
static const char* const kNetActiveWindow = "_NET_ACTIVE_WINDOW";
// static
ActiveWindowWatcherX* ActiveWindowWatcherX::GetInstance() {
return Singleton<ActiveWindowWatcherX>::get();
}
// static
void ActiveWindowWatcherX::AddObserver(ActiveWindowWatcherXObserver* observer) {
// Ensure that RootWindowPropertyWatcherX exists.
internal::RootWindowPropertyWatcherX::GetInstance();
GetInstance()->observers_.AddObserver(observer);
}
// static
void ActiveWindowWatcherX::RemoveObserver(
ActiveWindowWatcherXObserver* observer) {
GetInstance()->observers_.RemoveObserver(observer);
}
// static
Atom ActiveWindowWatcherX::GetPropertyAtom() {
return GetAtom(kNetActiveWindow);
}
// static
void ActiveWindowWatcherX::Notify() {
GetInstance()->NotifyActiveWindowChanged();
}
// static
bool ActiveWindowWatcherX::WMSupportsActivation() {
return gdk_x11_screen_supports_net_wm_hint(
gdk_screen_get_default(),
gdk_atom_intern_static_string(kNetActiveWindow));
}
ActiveWindowWatcherX::ActiveWindowWatcherX() {
}
ActiveWindowWatcherX::~ActiveWindowWatcherX() {
}
void ActiveWindowWatcherX::NotifyActiveWindowChanged() {
// We don't use gdk_screen_get_active_window() because it caches
// whether or not the window manager supports _NET_ACTIVE_WINDOW.
// This causes problems at startup for chromiumos.
Atom type = None;
int format = 0; // size in bits of each item in 'property'
long unsigned int num_items = 0, remaining_bytes = 0;
unsigned char* property = NULL;
XGetWindowProperty(gdk_x11_get_default_xdisplay(),
GDK_WINDOW_XID(gdk_get_default_root_window()),
GetAtom(kNetActiveWindow),
0, // offset into property data to read
1, // length to get in 32-bit quantities
False, // deleted
AnyPropertyType,
&type,
&format,
&num_items,
&remaining_bytes,
&property);
// Check that the property was set and contained a single 32-bit item (we
// don't check that remaining_bytes is 0, though, as XFCE's window manager
// seems to actually store two values in the property for some unknown
// reason.)
if (format == 32 && num_items == 1) {
int xid = *reinterpret_cast<int*>(property);
GdkDisplay* display = gdk_display_get_default();
GdkWindow* active_window = gdk_x11_window_lookup_for_display(display, xid);
FOR_EACH_OBSERVER(ActiveWindowWatcherXObserver, observers_,
ActiveWindowChanged(active_window));
}
if (property)
XFree(property);
}
} // namespace ui
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