ui/base/idle/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 "ui/base/idle/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 namespace ui {
  12
  13 ScreensaverWindowFinder::ScreensaverWindowFinder()
  14     : exists_(false) {
  15 }
  16
  17 bool ScreensaverWindowFinder::ScreensaverWindowExists() {
  18   gfx::X11ErrorTracker err_tracker;
  19   ScreensaverWindowFinder finder;
  20   ui::EnumerateTopLevelWindows(&finder);
  21   return finder.exists_ && !err_tracker.FoundNewError();
  22 }
  23
  24 bool ScreensaverWindowFinder::ShouldStopIterating(XID window) {
  25   if (!ui::IsWindowVisible(window) || !IsScreensaverWindow(window))
  26     return false;
  27   exists_ = true;
  28   return true;
  29 }
  30
  31 bool ScreensaverWindowFinder::IsScreensaverWindow(XID window) const {
  32   // It should occupy the full screen.
  33   if (!ui::IsX11WindowFullScreen(window))
  34     return false;
  35
  36   // For xscreensaver, the window should have _SCREENSAVER_VERSION property.
  37   if (ui::PropertyExists(window, "_SCREENSAVER_VERSION"))
  38     return true;
  39
  40   // For all others, like gnome-screensaver, the window's WM_CLASS property
  41   // should contain "screensaver".
  42   std::string value;
  43   if (!ui::GetStringProperty(window, "WM_CLASS", &value))
  44     return false;
  45
  46   return value.find("screensaver") != std::string::npos;
  47 }
  48
  49 }  // namespace ui