The Tor Browser / file comparison
comparison: accessible/src/base/TextUpdater.h
accessible/src/base/TextUpdater.h
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| 1 /* -*- Mode: C++; tab-width: 2; 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_TextUpdater_h__ | |
| 7 #define mozilla_a11y_TextUpdater_h__ | |
| 8 | |
| 9 #include "AccEvent.h" | |
| 10 #include "HyperTextAccessible.h" | |
| 11 | |
| 12 namespace mozilla { | |
| 13 namespace a11y { | |
| 14 | |
| 15 /** | |
| 16 * Used to find a difference between old and new text and fire text change | |
| 17 * events. | |
| 18 */ | |
| 19 class TextUpdater | |
| 20 { | |
| 21 public: | |
| 22 /** | |
| 23 * Start text of the text leaf update. | |
| 24 */ | |
| 25 static void Run(DocAccessible* aDocument, TextLeafAccessible* aTextLeaf, | |
| 26 const nsAString& aNewText); | |
| 27 | |
| 28 private: | |
| 29 TextUpdater(DocAccessible* aDocument, TextLeafAccessible* aTextLeaf) : | |
| 30 mDocument(aDocument), mTextLeaf(aTextLeaf), mHyperText(nullptr), | |
| 31 mTextOffset(-1) { } | |
| 32 | |
| 33 ~TextUpdater() | |
| 34 { mDocument = nullptr; mTextLeaf = nullptr; mHyperText = nullptr; } | |
| 35 | |
| 36 /** | |
| 37 * Update text of the text leaf accessible, fire text change and value change | |
| 38 * (if applicable) events for its container hypertext accessible. | |
| 39 */ | |
| 40 void DoUpdate(const nsAString& aNewText, const nsAString& aOldText, | |
| 41 uint32_t aSkipStart); | |
| 42 | |
| 43 private: | |
| 44 TextUpdater(); | |
| 45 TextUpdater(const TextUpdater&); | |
| 46 TextUpdater& operator=(const TextUpdater&); | |
| 47 | |
| 48 /** | |
| 49 * Fire text change events based on difference between strings. | |
| 50 */ | |
| 51 void ComputeTextChangeEvents(const nsAString& aStr1, | |
| 52 const nsAString& aStr2, | |
| 53 uint32_t* aEntries, | |
| 54 nsTArray<nsRefPtr<AccEvent> >& aEvents); | |
| 55 | |
| 56 /** | |
| 57 * Helper to create text change events for inserted text. | |
| 58 */ | |
| 59 inline void FireInsertEvent(const nsAString& aText, uint32_t aAddlOffset, | |
| 60 nsTArray<nsRefPtr<AccEvent> >& aEvents) | |
| 61 { | |
| 62 nsRefPtr<AccEvent> event = | |
| 63 new AccTextChangeEvent(mHyperText, mTextOffset + aAddlOffset, | |
| 64 aText, true); | |
| 65 aEvents.AppendElement(event); | |
| 66 } | |
| 67 | |
| 68 /** | |
| 69 * Helper to create text change events for removed text. | |
| 70 */ | |
| 71 inline void FireDeleteEvent(const nsAString& aText, uint32_t aAddlOffset, | |
| 72 nsTArray<nsRefPtr<AccEvent> >& aEvents) | |
| 73 { | |
| 74 nsRefPtr<AccEvent> event = | |
| 75 new AccTextChangeEvent(mHyperText, mTextOffset + aAddlOffset, | |
| 76 aText, false); | |
| 77 aEvents.AppendElement(event); | |
| 78 } | |
| 79 | |
| 80 /** | |
| 81 * The constant used to skip string difference calculation in case of long | |
| 82 * strings. | |
| 83 */ | |
| 84 const static uint32_t kMaxStrLen = 1 << 6; | |
| 85 | |
| 86 private: | |
| 87 DocAccessible* mDocument; | |
| 88 TextLeafAccessible* mTextLeaf; | |
| 89 HyperTextAccessible* mHyperText; | |
| 90 int32_t mTextOffset; | |
| 91 }; | |
| 92 | |
| 93 } // namespace a11y | |
| 94 } // namespace mozilla | |
| 95 | |
| 96 #endif |
