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      1 // Copyright (c) 2010 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/idle.h"
      6 
      7 #include <gdk/gdk.h>
      8 #include <gdk/gdkx.h>
      9 
     10 #include <vector>
     11 
     12 #include "base/basictypes.h"
     13 #include "chrome/browser/sync/engine/idle_query_linux.h"
     14 #include "chrome/browser/ui/gtk/gtk_util.h"
     15 #include "ui/base/x/x11_util.h"
     16 
     17 namespace {
     18 
     19 class ScreensaverWindowFinder : public ui::EnumerateWindowsDelegate {
     20  public:
     21   ScreensaverWindowFinder()
     22       : exists_(false) {}
     23 
     24   bool exists() const { return exists_; }
     25 
     26  protected:
     27   virtual bool ShouldStopIterating(XID window) {
     28     if (!ui::IsWindowVisible(window) || !IsScreensaverWindow(window))
     29       return false;
     30     exists_ = true;
     31     return true;
     32   }
     33 
     34  private:
     35   bool IsScreensaverWindow(XID window) const {
     36     // It should occupy the full screen.
     37     if (!ui::IsX11WindowFullScreen(window))
     38       return false;
     39 
     40     // For xscreensaver, the window should have _SCREENSAVER_VERSION property.
     41     if (ui::PropertyExists(window, "_SCREENSAVER_VERSION"))
     42       return true;
     43 
     44     // For all others, like gnome-screensaver, the window's WM_CLASS property
     45     // should contain "screensaver".
     46     std::string value;
     47     if (!ui::GetStringProperty(window, "WM_CLASS", &value))
     48       return false;
     49 
     50     return value.find("screensaver") != std::string::npos;
     51   }
     52 
     53   bool exists_;
     54 
     55   DISALLOW_COPY_AND_ASSIGN(ScreensaverWindowFinder);
     56 };
     57 
     58 bool ScreensaverWindowExists() {
     59   ScreensaverWindowFinder finder;
     60   gtk_util::EnumerateTopLevelWindows(&finder);
     61   return finder.exists();
     62 }
     63 
     64 }
     65 
     66 IdleState CalculateIdleState(unsigned int idle_threshold) {
     67   // Usually the screensaver is used to lock the screen, so we do not need to
     68   // check if the workstation is locked.
     69   gdk_error_trap_push();
     70   bool result = ScreensaverWindowExists();
     71   bool got_error = gdk_error_trap_pop();
     72   if (result && !got_error)
     73     return IDLE_STATE_LOCKED;
     74 
     75   browser_sync::IdleQueryLinux idle_query;
     76   unsigned int idle_time = idle_query.IdleTime();
     77   if (idle_time >= idle_threshold)
     78     return IDLE_STATE_IDLE;
     79   return IDLE_STATE_ACTIVE;
     80 }
     81