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// Copyright (c) 2011 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 <X11/Xlib.h>
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include "ui/base/x/active_window_watcher_x.h"
namespace ui {
static Atom g_net_active_window_atom = None;
// static
ActiveWindowWatcherX* ActiveWindowWatcherX::GetInstance() {
return Singleton<ActiveWindowWatcherX>::get();
}
// static
void ActiveWindowWatcherX::AddObserver(Observer* observer) {
GetInstance()->observers_.AddObserver(observer);
}
// static
void ActiveWindowWatcherX::RemoveObserver(Observer* observer) {
GetInstance()->observers_.RemoveObserver(observer);
}
// static
bool ActiveWindowWatcherX::WMSupportsActivation() {
return gdk_x11_screen_supports_net_wm_hint(
gdk_screen_get_default(),
gdk_atom_intern_static_string("_NET_ACTIVE_WINDOW"));
}
ActiveWindowWatcherX::ActiveWindowWatcherX() {
Init();
}
ActiveWindowWatcherX::~ActiveWindowWatcherX() {
}
void ActiveWindowWatcherX::Init() {
GdkAtom net_active_window =
gdk_atom_intern_static_string("_NET_ACTIVE_WINDOW");
g_net_active_window_atom = gdk_x11_atom_to_xatom_for_display(
gdk_screen_get_display(gdk_screen_get_default()), net_active_window);
GdkWindow* root = gdk_get_default_root_window();
// Set up X Event filter to listen for PropertyChange X events. These events
// tell us when the active window changes.
// 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(NULL, &ActiveWindowWatcherX::OnWindowXEventThunk, this);
}
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()),
g_net_active_window_atom,
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);
GdkWindow* active_window = gdk_window_lookup(xid);
FOR_EACH_OBSERVER(
Observer,
observers_,
ActiveWindowChanged(active_window));
}
if (property)
XFree(property);
}
GdkFilterReturn ActiveWindowWatcherX::OnWindowXEvent(GdkXEvent* xevent,
GdkEvent* event) {
XEvent* xev = static_cast<XEvent*>(xevent);
if (xev->xany.type == PropertyNotify &&
xev->xproperty.atom == g_net_active_window_atom) {
NotifyActiveWindowChanged();
}
return GDK_FILTER_CONTINUE;
}
} // namespace ui
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