| // 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 |