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comparison: accessible/src/base/SelectionManager.h
accessible/src/base/SelectionManager.h
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| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef mozilla_a11y_SelectionManager_h__ | |
| 7 #define mozilla_a11y_SelectionManager_h__ | |
| 8 | |
| 9 #include "nsIFrame.h" | |
| 10 #include "nsISelectionListener.h" | |
| 11 | |
| 12 class nsIPresShell; | |
| 13 | |
| 14 namespace mozilla { | |
| 15 | |
| 16 namespace dom { | |
| 17 class Element; | |
| 18 } | |
| 19 | |
| 20 namespace a11y { | |
| 21 | |
| 22 class AccEvent; | |
| 23 | |
| 24 /** | |
| 25 * This special accessibility class is for the caret and selection management. | |
| 26 * There is only 1 visible caret per top level window. However, there may be | |
| 27 * several visible selections. | |
| 28 * | |
| 29 * The important selections are the one owned by each document, and the one in | |
| 30 * the currently focused control. | |
| 31 * | |
| 32 * On Windows this class is used to move an invisible system caret that | |
| 33 * shadows the Mozilla caret. Windows will also automatically map this to | |
| 34 * the MSAA caret accessible object (via OBJID_CARET) (as opposed to the root | |
| 35 * accessible tree for a window which is retrieved with OBJID_CLIENT). | |
| 36 * | |
| 37 * For ATK and IAccessible2, this class is used to fire caret move and | |
| 38 * selection change events. | |
| 39 */ | |
| 40 | |
| 41 struct SelData; | |
| 42 | |
| 43 class SelectionManager : public nsISelectionListener | |
| 44 { | |
| 45 public: | |
| 46 // nsISupports | |
| 47 // implemented by derived nsAccessibilityService | |
| 48 | |
| 49 // nsISelectionListener | |
| 50 NS_DECL_NSISELECTIONLISTENER | |
| 51 | |
| 52 // SelectionManager | |
| 53 void Shutdown() { ClearControlSelectionListener(); } | |
| 54 | |
| 55 /** | |
| 56 * Listen to selection events on the focused control. | |
| 57 * | |
| 58 * Note: only one control's selection events are listened to at a time. This | |
| 59 * will remove the previous control's selection listener. | |
| 60 */ | |
| 61 void SetControlSelectionListener(dom::Element* aFocusedElm); | |
| 62 | |
| 63 /** | |
| 64 * Stop listening to selection events on the control. | |
| 65 */ | |
| 66 void ClearControlSelectionListener(); | |
| 67 | |
| 68 /** | |
| 69 * Listen to selection events on the document. | |
| 70 */ | |
| 71 void AddDocSelectionListener(nsIPresShell* aPresShell); | |
| 72 | |
| 73 /** | |
| 74 * Stop listening to selection events for a given document | |
| 75 */ | |
| 76 void RemoveDocSelectionListener(nsIPresShell* aShell); | |
| 77 | |
| 78 /** | |
| 79 * Process delayed event, results in caret move and text selection change | |
| 80 * events. | |
| 81 */ | |
| 82 void ProcessTextSelChangeEvent(AccEvent* aEvent); | |
| 83 | |
| 84 protected: | |
| 85 /** | |
| 86 * Process DOM selection change. Fire selection and caret move events. | |
| 87 */ | |
| 88 void ProcessSelectionChanged(SelData* aSelData); | |
| 89 | |
| 90 private: | |
| 91 // Currently focused control. | |
| 92 nsWeakFrame mCurrCtrlFrame; | |
| 93 }; | |
| 94 | |
| 95 } // namespace a11y | |
| 96 } // namespace mozilla | |
| 97 | |
| 98 #endif |
