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1 // Copyright 2013 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 #ifndef UI_AURA_CLIENT_DEFAULT_ACTIVATION_CLIENT_H_
6 #define UI_AURA_CLIENT_DEFAULT_ACTIVATION_CLIENT_H_
7 
8 #include <vector>
9 
10 #include "base/compiler_specific.h"
11 #include "base/logging.h"
12 #include "base/observer_list.h"
13 #include "ui/aura/aura_export.h"
14 #include "ui/aura/client/activation_client.h"
15 #include "ui/aura/window_observer.h"
16 
17 namespace aura {
18 namespace client {
19 class ActivationChangeObserver;
20 }
21 
22 namespace client {
23 
24 // Simple ActivationClient implementation for use by tests and other targets
25 // that just need basic behavior (e.g. activate windows whenever requested,
26 // restack windows at the top when they're activated, etc.).
27 class AURA_EXPORT DefaultActivationClient : public client::ActivationClient,
28                                             public WindowObserver {
29  public:
30   explicit DefaultActivationClient(Window* root_window);
31   virtual ~DefaultActivationClient();
32 
33   // Overridden from client::ActivationClient:
34   virtual void AddObserver(client::ActivationChangeObserver* observer) OVERRIDE;
35   virtual void RemoveObserver(
36       client::ActivationChangeObserver* observer) OVERRIDE;
37   virtual void ActivateWindow(Window* window) OVERRIDE;
38   virtual void DeactivateWindow(Window* window) OVERRIDE;
39   virtual Window* GetActiveWindow() OVERRIDE;
40   virtual Window* GetActivatableWindow(Window* window) OVERRIDE;
41   virtual Window* GetToplevelWindow(Window* window) OVERRIDE;
42   virtual bool OnWillFocusWindow(Window* window,
43                                  const ui::Event* event) OVERRIDE;
44   virtual bool CanActivateWindow(Window* window) const OVERRIDE;
45 
46   // Overridden from WindowObserver:
47   virtual void OnWindowDestroyed(Window* window) OVERRIDE;
48 
49  private:
50   void RemoveActiveWindow(Window* window);
51 
52   // This class explicitly does NOT store the active window in a window property
53   // to make sure that ActivationChangeObserver is not treated as part of the
54   // aura API. Assumptions to that end will cause tests that use this client to
55   // fail.
56   std::vector<Window*> active_windows_;
57 
58   // The window which was active before the currently active one.
59   Window* last_active_;
60 
61   ObserverList<client::ActivationChangeObserver> observers_;
62 
63   DISALLOW_COPY_AND_ASSIGN(DefaultActivationClient);
64 };
65 
66 }  // namespace client
67 }  // namespace aura
68 
69 #endif  // UI_AURA_CLIENT_DEFAULT_ACTIVATION_CLIENT_H_
70