The Tor Browser / file comparison
comparison: dom/events/ContentEventHandler.h
dom/events/ContentEventHandler.h
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- changeset 15
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| -1:000000000000 | 0:dceef615de97 |
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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_ContentEventHandler_h_ | |
| 7 #define mozilla_ContentEventHandler_h_ | |
| 8 | |
| 9 #include "mozilla/EventForwards.h" | |
| 10 #include "nsCOMPtr.h" | |
| 11 #include "nsISelection.h" | |
| 12 #include "nsRange.h" | |
| 13 | |
| 14 class nsPresContext; | |
| 15 | |
| 16 struct nsRect; | |
| 17 | |
| 18 namespace mozilla { | |
| 19 | |
| 20 enum LineBreakType | |
| 21 { | |
| 22 LINE_BREAK_TYPE_NATIVE, | |
| 23 LINE_BREAK_TYPE_XP | |
| 24 }; | |
| 25 | |
| 26 /* | |
| 27 * Query Content Event Handler | |
| 28 * ContentEventHandler is a helper class for EventStateManager. | |
| 29 * The platforms request some content informations, e.g., the selected text, | |
| 30 * the offset of the selected text and the text for specified range. | |
| 31 * This class answers to NS_QUERY_* events from actual contents. | |
| 32 */ | |
| 33 | |
| 34 class MOZ_STACK_CLASS ContentEventHandler | |
| 35 { | |
| 36 public: | |
| 37 ContentEventHandler(nsPresContext* aPresContext); | |
| 38 | |
| 39 // NS_QUERY_SELECTED_TEXT event handler | |
| 40 nsresult OnQuerySelectedText(WidgetQueryContentEvent* aEvent); | |
| 41 // NS_QUERY_TEXT_CONTENT event handler | |
| 42 nsresult OnQueryTextContent(WidgetQueryContentEvent* aEvent); | |
| 43 // NS_QUERY_CARET_RECT event handler | |
| 44 nsresult OnQueryCaretRect(WidgetQueryContentEvent* aEvent); | |
| 45 // NS_QUERY_TEXT_RECT event handler | |
| 46 nsresult OnQueryTextRect(WidgetQueryContentEvent* aEvent); | |
| 47 // NS_QUERY_EDITOR_RECT event handler | |
| 48 nsresult OnQueryEditorRect(WidgetQueryContentEvent* aEvent); | |
| 49 // NS_QUERY_CONTENT_STATE event handler | |
| 50 nsresult OnQueryContentState(WidgetQueryContentEvent* aEvent); | |
| 51 // NS_QUERY_SELECTION_AS_TRANSFERABLE event handler | |
| 52 nsresult OnQuerySelectionAsTransferable(WidgetQueryContentEvent* aEvent); | |
| 53 // NS_QUERY_CHARACTER_AT_POINT event handler | |
| 54 nsresult OnQueryCharacterAtPoint(WidgetQueryContentEvent* aEvent); | |
| 55 // NS_QUERY_DOM_WIDGET_HITTEST event handler | |
| 56 nsresult OnQueryDOMWidgetHittest(WidgetQueryContentEvent* aEvent); | |
| 57 | |
| 58 // NS_SELECTION_* event | |
| 59 nsresult OnSelectionEvent(WidgetSelectionEvent* aEvent); | |
| 60 | |
| 61 protected: | |
| 62 nsPresContext* mPresContext; | |
| 63 nsCOMPtr<nsIPresShell> mPresShell; | |
| 64 nsCOMPtr<nsISelection> mSelection; | |
| 65 nsRefPtr<nsRange> mFirstSelectedRange; | |
| 66 nsCOMPtr<nsIContent> mRootContent; | |
| 67 | |
| 68 nsresult Init(WidgetQueryContentEvent* aEvent); | |
| 69 nsresult Init(WidgetSelectionEvent* aEvent); | |
| 70 | |
| 71 nsresult InitBasic(); | |
| 72 nsresult InitCommon(); | |
| 73 | |
| 74 public: | |
| 75 // FlatText means the text that is generated from DOM tree. The BR elements | |
| 76 // are replaced to native linefeeds. Other elements are ignored. | |
| 77 | |
| 78 // Get the offset in FlatText of the range. (also used by IMEContentObserver) | |
| 79 static nsresult GetFlatTextOffsetOfRange(nsIContent* aRootContent, | |
| 80 nsINode* aNode, | |
| 81 int32_t aNodeOffset, | |
| 82 uint32_t* aOffset, | |
| 83 LineBreakType aLineBreakType); | |
| 84 static nsresult GetFlatTextOffsetOfRange(nsIContent* aRootContent, | |
| 85 nsRange* aRange, | |
| 86 uint32_t* aOffset, | |
| 87 LineBreakType aLineBreakType); | |
| 88 // Get the native text length of a content node excluding any children | |
| 89 static uint32_t GetNativeTextLength(nsIContent* aContent, | |
| 90 uint32_t aMaxLength = UINT32_MAX); | |
| 91 protected: | |
| 92 static uint32_t GetTextLength(nsIContent* aContent, | |
| 93 LineBreakType aLineBreakType, | |
| 94 uint32_t aMaxLength = UINT32_MAX); | |
| 95 static LineBreakType GetLineBreakType(WidgetQueryContentEvent* aEvent); | |
| 96 static LineBreakType GetLineBreakType(WidgetSelectionEvent* aEvent); | |
| 97 static LineBreakType GetLineBreakType(bool aUseNativeLineBreak); | |
| 98 // Returns focused content (including its descendant documents). | |
| 99 nsIContent* GetFocusedContent(); | |
| 100 // Returns true if the content is a plugin host. | |
| 101 bool IsPlugin(nsIContent* aContent); | |
| 102 // QueryContentRect() sets the rect of aContent's frame(s) to aEvent. | |
| 103 nsresult QueryContentRect(nsIContent* aContent, | |
| 104 WidgetQueryContentEvent* aEvent); | |
| 105 // Make the DOM range from the offset of FlatText and the text length. | |
| 106 // If aExpandToClusterBoundaries is true, the start offset and the end one are | |
| 107 // expanded to nearest cluster boundaries. | |
| 108 nsresult SetRangeFromFlatTextOffset(nsRange* aRange, | |
| 109 uint32_t aOffset, | |
| 110 uint32_t aLength, | |
| 111 LineBreakType aLineBreakType, | |
| 112 bool aExpandToClusterBoundaries, | |
| 113 uint32_t* aNewOffset = nullptr); | |
| 114 // Find the first textframe for the range, and get the start offset in | |
| 115 // the frame. | |
| 116 nsresult GetStartFrameAndOffset(nsRange* aRange, | |
| 117 nsIFrame** aFrame, | |
| 118 int32_t* aOffsetInFrame); | |
| 119 // Convert the frame relative offset to the root view relative offset. | |
| 120 nsresult ConvertToRootViewRelativeOffset(nsIFrame* aFrame, | |
| 121 nsRect& aRect); | |
| 122 // Expand aXPOffset to the nearest offset in cluster boundary. aForward is | |
| 123 // true, it is expanded to forward. | |
| 124 nsresult ExpandToClusterBoundary(nsIContent* aContent, bool aForward, | |
| 125 uint32_t* aXPOffset); | |
| 126 }; | |
| 127 | |
| 128 } // namespace mozilla | |
| 129 | |
| 130 #endif // mozilla_ContentEventHandler_h_ |
