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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef UI_VIEWS_FOCUS_EXTERNAL_FOCUS_TRACKER_H_ | |
| 6 #define UI_VIEWS_FOCUS_EXTERNAL_FOCUS_TRACKER_H_ | |
| 7 | |
| 8 #include "base/compiler_specific.h" | |
| 9 #include "ui/views/focus/focus_manager.h" | |
| 10 | |
| 11 namespace views { | |
| 12 | |
| 13 class View; | |
| 14 class ViewStorage; | |
| 15 | |
| 16 // ExternalFocusTracker tracks the last focused view which belongs to the | |
| 17 // provided focus manager and is not either the provided parent view or one of | |
| 18 // its descendants. This is generally used if the parent view want to return | |
| 19 // focus to some other view once it is dismissed. The parent view and the focus | |
| 20 // manager must exist for the duration of the tracking. If the focus manager | |
| 21 // must be deleted before this object is deleted, make sure to call | |
| 22 // SetFocusManager(NULL) first. | |
| 23 // | |
| 24 // Typical use: When a view is added to the view hierarchy, it instantiates an | |
| 25 // ExternalFocusTracker and passes in itself and its focus manager. Then, | |
| 26 // when that view wants to return focus to the last focused view which is not | |
| 27 // itself and not a descandant of itself, (usually when it is being closed) | |
| 28 // it calls FocusLastFocusedExternalView. | |
| 29 class VIEWS_EXPORT ExternalFocusTracker : public FocusChangeListener { | |
| 30 public: | |
| 31 ExternalFocusTracker(View* parent_view, FocusManager* focus_manager); | |
| 32 virtual ~ExternalFocusTracker(); | |
| 33 | |
| 34 // FocusChangeListener: | |
| 35 virtual void OnWillChangeFocus(View* focused_before, | |
| 36 View* focused_now) override; | |
| 37 virtual void OnDidChangeFocus(View* focused_before, | |
| 38 View* focused_now) override; | |
| 39 | |
| 40 // Focuses last focused view which is not a child of parent view and is not | |
| 41 // parent view itself. Returns true if focus for a view was requested, false | |
| 42 // otherwise. | |
| 43 void FocusLastFocusedExternalView(); | |
| 44 | |
| 45 // Sets the focus manager whose focus we are tracking. |focus_manager| can | |
| 46 // be NULL, but no focus changes will be tracked. This is useful if the focus | |
| 47 // manager went away, but you might later want to start tracking with a new | |
| 48 // manager later, or call FocusLastFocusedExternalView to focus the previous | |
| 49 // view. | |
| 50 void SetFocusManager(FocusManager* focus_manager); | |
| 51 | |
| 52 private: | |
| 53 // Store the provided view. This view will be focused when | |
| 54 // FocusLastFocusedExternalView is called. | |
| 55 void StoreLastFocusedView(View* view); | |
| 56 | |
| 57 // Store the currently focused view for our view manager and register as a | |
| 58 // listener for future focus changes. | |
| 59 void StartTracking(); | |
| 60 | |
| 61 // Focus manager which we are a listener for. | |
| 62 FocusManager* focus_manager_; | |
| 63 | |
| 64 // ID of the last focused view, which we store in view_storage_. | |
| 65 int last_focused_view_storage_id_; | |
| 66 | |
| 67 // Used to store the last focused view which is not a child of | |
| 68 // ExternalFocusTracker. | |
| 69 ViewStorage* view_storage_; | |
| 70 | |
| 71 // The parent view of views which we should not track focus changes to. We | |
| 72 // also do not track changes to parent_view_ itself. | |
| 73 View* parent_view_; | |
| 74 | |
| 75 DISALLOW_COPY_AND_ASSIGN(ExternalFocusTracker); | |
| 76 }; | |
| 77 | |
| 78 } // namespace views | |
| 79 | |
| 80 #endif // UI_VIEWS_FOCUS_EXTERNAL_FOCUS_TRACKER_H_ | |
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