chrome/browser/screensaver_window_finder_x11.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/screensaver_window_finder_x11.h"
   6
   7 #include "base/basictypes.h"
   8 #include "ui/base/x/x11_util.h"
   9 #include "ui/gfx/x/x11_error_tracker.h"
  10
  11 ScreensaverWindowFinder::ScreensaverWindowFinder()
  12     : exists_(false) {
  13 }
  14
  15 bool ScreensaverWindowFinder::ScreensaverWindowExists() {
  16   gfx::X11ErrorTracker err_tracker;
  17   ScreensaverWindowFinder finder;
  18   ui::EnumerateTopLevelWindows(&finder);
  19   return finder.exists_ && !err_tracker.FoundNewError();
  20 }
  21
  22 bool ScreensaverWindowFinder::ShouldStopIterating(XID window) {
  23   if (!ui::IsWindowVisible(window) || !IsScreensaverWindow(window))
  24     return false;
  25   exists_ = true;
  26   return true;
  27 }
  28
  29 bool ScreensaverWindowFinder::IsScreensaverWindow(XID window) const {
  30   // It should occupy the full screen.
  31   if (!ui::IsX11WindowFullScreen(window))
  32     return false;
  33
  34   // For xscreensaver, the window should have _SCREENSAVER_VERSION property.
  35   if (ui::PropertyExists(window, "_SCREENSAVER_VERSION"))
  36     return true;
  37
  38   // For all others, like gnome-screensaver, the window's WM_CLASS property
  39   // should contain "screensaver".
  40   std::string value;
  41   if (!ui::GetStringProperty(window, "WM_CLASS", &value))
  42     return false;
  43
  44   return value.find("screensaver") != std::string::npos;
  45 }