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      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 }
     46