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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 "chrome/browser/fullscreen.h"
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include <algorithm>
#include <vector>
#include "base/basictypes.h"
#include "chrome/browser/ui/gtk/gtk_util.h"
#include "ui/base/x/x11_util.h"
#include "ui/gfx/rect.h"
namespace {
// TODO (jianli): Merge with gtk_util::EnumerateTopLevelWindows.
void EnumerateAllChildWindows(ui::EnumerateWindowsDelegate* delegate,
XID window) {
std::vector<XID> windows;
if (!ui::GetXWindowStack(window, &windows)) {
// Window Manager doesn't support _NET_CLIENT_LIST_STACKING, so fall back
// to old school enumeration of all X windows.
XID root, parent, *children;
unsigned int num_children;
int status = XQueryTree(ui::GetXDisplay(), window, &root, &parent,
&children, &num_children);
if (status) {
for (long i = static_cast<long>(num_children) - 1; i >= 0; i--)
windows.push_back(children[i]);
XFree(children);
}
}
std::vector<XID>::iterator iter;
for (iter = windows.begin(); iter != windows.end(); iter++) {
if (delegate->ShouldStopIterating(*iter))
return;
}
}
// To find the top-most window:
// 1) Enumerate all top-level windows from the top to the bottom.
// 2) For each window:
// 2.1) If it is hidden, continue the iteration.
// 2.2) If it is managed by the Window Manager (has a WM_STATE property).
// Return this window as the top-most window.
// 2.3) Enumerate all its child windows. If there is a child window that is
// managed by the Window Manager (has a WM_STATE property). Return this
// child window as the top-most window.
// 2.4) Otherwise, continue the iteration.
class WindowManagerWindowFinder : public ui::EnumerateWindowsDelegate {
public:
WindowManagerWindowFinder() : window_(None) { }
XID window() const { return window_; }
protected:
virtual bool ShouldStopIterating(XID window) {
if (ui::PropertyExists(window, "WM_STATE")) {
window_ = window;
return true;
}
return false;
}
private:
XID window_;
DISALLOW_COPY_AND_ASSIGN(WindowManagerWindowFinder);
};
class TopMostWindowFinder : public ui::EnumerateWindowsDelegate {
public:
TopMostWindowFinder()
: top_most_window_(None) {}
XID top_most_window() const { return top_most_window_; }
protected:
virtual bool ShouldStopIterating(XID window) {
if (!ui::IsWindowVisible(window))
return false;
if (ui::PropertyExists(window, "WM_STATE")) {
top_most_window_ = window;
return true;
}
WindowManagerWindowFinder child_finder;
EnumerateAllChildWindows(&child_finder, window);
XID child_window = child_finder.window();
if (child_window == None)
return false;
top_most_window_ = child_window;
return true;
}
private:
XID top_most_window_;
DISALLOW_COPY_AND_ASSIGN(TopMostWindowFinder);
};
bool IsTopMostWindowFullScreen() {
// Find the topmost window.
TopMostWindowFinder finder;
EnumerateAllChildWindows(&finder, ui::GetX11RootWindow());
XID window = finder.top_most_window();
if (window == None)
return false;
// Make sure it is not the desktop window.
static Atom desktop_atom = gdk_x11_get_xatom_by_name_for_display(
gdk_display_get_default(), "_NET_WM_WINDOW_TYPE_DESKTOP");
std::vector<Atom> atom_properties;
if (ui::GetAtomArrayProperty(window,
"_NET_WM_WINDOW_TYPE",
&atom_properties) &&
std::find(atom_properties.begin(), atom_properties.end(), desktop_atom)
!= atom_properties.end())
return false;
// If it is a GDK window, check it using gdk function.
GdkWindow* gwindow = gdk_window_lookup(window);
if (gwindow && window != GDK_ROOT_WINDOW())
return gdk_window_get_state(gwindow) == GDK_WINDOW_STATE_FULLSCREEN;
// Otherwise, do the check via xlib function.
return ui::IsX11WindowFullScreen(window);
}
}
bool IsFullScreenMode() {
gdk_error_trap_push();
bool result = IsTopMostWindowFullScreen();
bool got_error = gdk_error_trap_pop();
return result && !got_error;
}
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