chrome/browser/ui/aura/active_desktop_monitor.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/ui/aura/active_desktop_monitor.h"
   6
   7 #include "ui/aura/env.h"
   8 #include "ui/aura/window_tree_host.h"
   9
  10 #if defined(USE_X11)
  11 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
  12 #elif defined(OS_WIN)
  13 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_win.h"
  14 #endif
  15
  16 // static
  17 ActiveDesktopMonitor* ActiveDesktopMonitor::g_instance_ = NULL;
  18
  19 ActiveDesktopMonitor::ActiveDesktopMonitor(
  20     chrome::HostDesktopType initial_desktop)
  21     : last_activated_desktop_(initial_desktop) {
  22   DCHECK(!g_instance_);
  23   g_instance_ = this;
  24   aura::Env::GetInstance()->AddObserver(this);
  25 }
  26
  27 ActiveDesktopMonitor::~ActiveDesktopMonitor() {
  28   DCHECK_EQ(g_instance_, this);
  29   aura::Env::GetInstance()->RemoveObserver(this);
  30   g_instance_ = NULL;
  31 }
  32
  33 // static
  34 chrome::HostDesktopType ActiveDesktopMonitor::GetLastActivatedDesktopType() {
  35   // Tests may not have created the monitor.
  36   return g_instance_ ? g_instance_->last_activated_desktop_ :
  37       chrome::HOST_DESKTOP_TYPE_NATIVE;
  38 }
  39
  40 // static
  41 bool ActiveDesktopMonitor::IsDesktopWindow(aura::WindowTreeHost* host) {
  42   // Only windows hosted by a DesktopWindowTreeHost implementation can be mapped
  43   // back to a content Window. All others, therefore, must be the root window
  44   // for an Ash display.
  45 #if defined(OS_WIN)
  46   return views::DesktopWindowTreeHostWin::GetContentWindowForHWND(
  47       host->GetAcceleratedWidget()) != NULL;
  48 #elif defined(USE_X11)
  49   return views::DesktopWindowTreeHostX11::GetContentWindowForXID(
  50       host->GetAcceleratedWidget()) != NULL;
  51 #else
  52   NOTREACHED();
  53   return true;
  54 #endif
  55 }
  56
  57 void ActiveDesktopMonitor::OnWindowInitialized(aura::Window* window) {}
  58
  59 void ActiveDesktopMonitor::OnHostActivated(aura::WindowTreeHost* host) {
  60   if (IsDesktopWindow(host))
  61     last_activated_desktop_ = chrome::HOST_DESKTOP_TYPE_NATIVE;
  62   else
  63     last_activated_desktop_ = chrome::HOST_DESKTOP_TYPE_ASH;
  64   DVLOG(1) << __FUNCTION__
  65            << (last_activated_desktop_ == chrome::HOST_DESKTOP_TYPE_NATIVE ?
  66                " native" : " ash") << " desktop activated.";
  67 }