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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CHROME_BROWSER_UI_AURA_ACTIVE_DESKTOP_MONITOR_H_ | 5 #ifndef CHROME_BROWSER_UI_AURA_ACTIVE_DESKTOP_MONITOR_H_ |
6 #define CHROME_BROWSER_UI_AURA_ACTIVE_DESKTOP_MONITOR_H_ | 6 #define CHROME_BROWSER_UI_AURA_ACTIVE_DESKTOP_MONITOR_H_ |
7 | 7 |
8 #include "base/basictypes.h" | 8 #include "base/basictypes.h" |
9 #include "base/compiler_specific.h" | 9 #include "base/compiler_specific.h" |
10 #include "chrome/browser/ui/host_desktop.h" | 10 #include "chrome/browser/ui/host_desktop.h" |
11 #include "ui/aura/env_observer.h" | 11 #include "ui/aura/env_observer.h" |
12 | 12 |
13 // Tracks the most-recently activated host desktop type by observing | 13 // Tracks the most-recently activated host desktop type by observing |
14 // WindowTreeHost activations. | 14 // WindowTreeHost activations. |
15 class ActiveDesktopMonitor : public aura::EnvObserver { | 15 class ActiveDesktopMonitor : public aura::EnvObserver { |
16 public: | 16 public: |
17 // Constructs an ActiveDesktopMonitor which initially uses |initial_desktop| | 17 // Constructs an ActiveDesktopMonitor which initially uses |initial_desktop| |
18 // as the |last_activated_desktop_| until a root window is activated. | 18 // as the |last_activated_desktop_| until a root window is activated. |
19 explicit ActiveDesktopMonitor(chrome::HostDesktopType initial_desktop); | 19 explicit ActiveDesktopMonitor(chrome::HostDesktopType initial_desktop); |
20 virtual ~ActiveDesktopMonitor(); | 20 ~ActiveDesktopMonitor() override; |
21 | 21 |
22 // Returns the host desktop type of the most-recently activated | 22 // Returns the host desktop type of the most-recently activated |
23 // WindowTreeHost. This desktop type may no longer exist (e.g., the Ash | 23 // WindowTreeHost. This desktop type may no longer exist (e.g., the Ash |
24 // desktop may have closed since being active, and no RWHs on the native | 24 // desktop may have closed since being active, and no RWHs on the native |
25 // desktop have yet been activated). | 25 // desktop have yet been activated). |
26 static chrome::HostDesktopType GetLastActivatedDesktopType(); | 26 static chrome::HostDesktopType GetLastActivatedDesktopType(); |
27 | 27 |
28 private: | 28 private: |
29 // Returns true if |host| is a DesktopWindowTreeHost. | 29 // Returns true if |host| is a DesktopWindowTreeHost. |
30 static bool IsDesktopWindow(aura::WindowTreeHost* host); | 30 static bool IsDesktopWindow(aura::WindowTreeHost* host); |
31 | 31 |
32 // aura::EnvObserver methods. | 32 // aura::EnvObserver methods. |
33 virtual void OnWindowInitialized(aura::Window* window) override; | 33 void OnWindowInitialized(aura::Window* window) override; |
34 virtual void OnHostActivated(aura::WindowTreeHost* host) override; | 34 void OnHostActivated(aura::WindowTreeHost* host) override; |
35 | 35 |
36 static ActiveDesktopMonitor* g_instance_; | 36 static ActiveDesktopMonitor* g_instance_; |
37 chrome::HostDesktopType last_activated_desktop_; | 37 chrome::HostDesktopType last_activated_desktop_; |
38 | 38 |
39 DISALLOW_COPY_AND_ASSIGN(ActiveDesktopMonitor); | 39 DISALLOW_COPY_AND_ASSIGN(ActiveDesktopMonitor); |
40 }; | 40 }; |
41 | 41 |
42 #endif // CHROME_BROWSER_UI_AURA_ACTIVE_DESKTOP_MONITOR_H_ | 42 #endif // CHROME_BROWSER_UI_AURA_ACTIVE_DESKTOP_MONITOR_H_ |
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