99 lines
3.2 KiB
C++
99 lines
3.2 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "atom/browser/ui/gtk/active_window_watcher_x.h"
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#include <gdk/gdk.h>
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#include <gdk/gdkx.h>
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#include "atom/browser/ui/gtk/active_window_watcher_x_observer.h"
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#include "atom/browser/ui/gtk/root_window_property_watcher_x.h"
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#include "base/memory/singleton.h"
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#include "ui/base/x/x11_util.h"
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#include "ui/gfx/gdk_compat.h"
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#include "ui/gfx/gtk_compat.h"
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namespace ui {
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static const char* const kNetActiveWindow = "_NET_ACTIVE_WINDOW";
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// static
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ActiveWindowWatcherX* ActiveWindowWatcherX::GetInstance() {
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return Singleton<ActiveWindowWatcherX>::get();
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}
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// static
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void ActiveWindowWatcherX::AddObserver(ActiveWindowWatcherXObserver* observer) {
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// Ensure that RootWindowPropertyWatcherX exists.
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internal::RootWindowPropertyWatcherX::GetInstance();
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GetInstance()->observers_.AddObserver(observer);
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}
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// static
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void ActiveWindowWatcherX::RemoveObserver(
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ActiveWindowWatcherXObserver* observer) {
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GetInstance()->observers_.RemoveObserver(observer);
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}
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// static
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Atom ActiveWindowWatcherX::GetPropertyAtom() {
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return GetAtom(kNetActiveWindow);
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}
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// static
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void ActiveWindowWatcherX::Notify() {
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GetInstance()->NotifyActiveWindowChanged();
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}
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// static
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bool ActiveWindowWatcherX::WMSupportsActivation() {
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return gdk_x11_screen_supports_net_wm_hint(
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gdk_screen_get_default(),
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gdk_atom_intern_static_string(kNetActiveWindow));
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}
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ActiveWindowWatcherX::ActiveWindowWatcherX() {
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}
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ActiveWindowWatcherX::~ActiveWindowWatcherX() {
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}
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void ActiveWindowWatcherX::NotifyActiveWindowChanged() {
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// We don't use gdk_screen_get_active_window() because it caches
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// whether or not the window manager supports _NET_ACTIVE_WINDOW.
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// This causes problems at startup for chromiumos.
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Atom type = None;
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int format = 0; // size in bits of each item in 'property'
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long unsigned int num_items = 0, remaining_bytes = 0;
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unsigned char* property = NULL;
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XGetWindowProperty(gdk_x11_get_default_xdisplay(),
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GDK_WINDOW_XID(gdk_get_default_root_window()),
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GetAtom(kNetActiveWindow),
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0, // offset into property data to read
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1, // length to get in 32-bit quantities
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False, // deleted
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AnyPropertyType,
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&type,
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&format,
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&num_items,
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&remaining_bytes,
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&property);
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// Check that the property was set and contained a single 32-bit item (we
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// don't check that remaining_bytes is 0, though, as XFCE's window manager
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// seems to actually store two values in the property for some unknown
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// reason.)
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if (format == 32 && num_items == 1) {
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int xid = *reinterpret_cast<int*>(property);
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GdkDisplay* display = gdk_display_get_default();
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GdkWindow* active_window = gdk_x11_window_lookup_for_display(display, xid);
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FOR_EACH_OBSERVER(ActiveWindowWatcherXObserver, observers_,
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ActiveWindowChanged(active_window));
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}
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if (property)
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XFree(property);
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}
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} // namespace ui
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