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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 VIEWS_FOCUS_WIDGET_FOCUS_MANAGER_H_ | 5 #ifndef VIEWS_FOCUS_WIDGET_FOCUS_MANAGER_H_ |
6 #define VIEWS_FOCUS_WIDGET_FOCUS_MANAGER_H_ | 6 #define VIEWS_FOCUS_WIDGET_FOCUS_MANAGER_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include "base/basictypes.h" | 9 #include "ui/views/focus/widget_focus_manager.h" |
10 #include "base/observer_list.h" | 10 // TODO(tfarina): remove this file once all includes have been updated. |
11 #include "ui/gfx/native_widget_types.h" | |
12 #include "views/views_export.h" | |
13 | |
14 template <typename T> struct DefaultSingletonTraits; | |
15 | |
16 namespace views { | |
17 | |
18 // This interface should be implemented by classes that want to be notified when | |
19 // the native focus is about to change. Listeners implementing this interface | |
20 // will be invoked for all native focus changes across the entire Chrome | |
21 // application. FocusChangeListeners are only called for changes within the | |
22 // children of a single top-level native-view. | |
23 class WidgetFocusChangeListener { | |
24 public: | |
25 virtual void OnNativeFocusChange(gfx::NativeView focused_before, | |
26 gfx::NativeView focused_now) = 0; | |
27 | |
28 protected: | |
29 virtual ~WidgetFocusChangeListener() {} | |
30 }; | |
31 | |
32 class VIEWS_EXPORT WidgetFocusManager { | |
33 public: | |
34 // Returns the singleton instance. | |
35 static WidgetFocusManager* GetInstance(); | |
36 | |
37 // Adds/removes a WidgetFocusChangeListener |listener| to the set of | |
38 // active listeners. | |
39 void AddFocusChangeListener(WidgetFocusChangeListener* listener); | |
40 void RemoveFocusChangeListener(WidgetFocusChangeListener* listener); | |
41 | |
42 // To be called when native-focus shifts from |focused_before| to | |
43 // |focused_now|. | |
44 // TODO(port) : Invocations to this routine are only implemented for | |
45 // the Win32 platform. Calls need to be placed appropriately for | |
46 // non-Windows environments. | |
47 void OnWidgetFocusEvent(gfx::NativeView focused_before, | |
48 gfx::NativeView focused_now); | |
49 | |
50 // Enable/Disable notification of registered listeners during calls | |
51 // to OnWidgetFocusEvent. Used to prevent unwanted focus changes from | |
52 // propagating notifications. | |
53 void EnableNotifications() { enabled_ = true; } | |
54 void DisableNotifications() { enabled_ = false; } | |
55 | |
56 private: | |
57 friend struct DefaultSingletonTraits<WidgetFocusManager>; | |
58 | |
59 WidgetFocusManager(); | |
60 ~WidgetFocusManager(); | |
61 | |
62 ObserverList<WidgetFocusChangeListener> focus_change_listeners_; | |
63 | |
64 bool enabled_; | |
65 | |
66 DISALLOW_COPY_AND_ASSIGN(WidgetFocusManager); | |
67 }; | |
68 | |
69 // A basic helper class that is used to disable native focus change | |
70 // notifications within a scope. | |
71 class VIEWS_EXPORT AutoNativeNotificationDisabler { | |
72 public: | |
73 AutoNativeNotificationDisabler(); | |
74 ~AutoNativeNotificationDisabler(); | |
75 | |
76 private: | |
77 DISALLOW_COPY_AND_ASSIGN(AutoNativeNotificationDisabler); | |
78 }; | |
79 | |
80 } // namespace views | |
81 | 11 |
82 #endif // VIEWS_FOCUS_WIDGET_FOCUS_MANAGER_H_ | 12 #endif // VIEWS_FOCUS_WIDGET_FOCUS_MANAGER_H_ |
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