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26 #ifndef VisibleSelection_h
27 #define VisibleSelection_h
29 #include "core/editing/SelectionType.h"
30 #include "core/editing/TextGranularity.h"
31 #include "core/editing/VisiblePosition.h"
38 const EAffinity SEL_DEFAULT_AFFINITY = DOWNSTREAM;
39 enum SelectionDirection { DirectionForward, DirectionBackward, DirectionRight, DirectionLeft };
41 class VisibleSelection {
42 DISALLOW_ALLOCATION();
46 VisibleSelection(const Position&, EAffinity, bool isDirectional = false);
47 VisibleSelection(const Position&, const Position&, EAffinity = SEL_DEFAULT_AFFINITY, bool isDirectional = false);
49 explicit VisibleSelection(const Range*, EAffinity = SEL_DEFAULT_AFFINITY, bool isDirectional = false);
51 explicit VisibleSelection(const VisiblePosition&, bool isDirectional = false);
52 VisibleSelection(const VisiblePosition&, const VisiblePosition&, bool isDirectional = false);
54 VisibleSelection(const VisibleSelection&);
55 VisibleSelection& operator=(const VisibleSelection&);
59 static VisibleSelection selectionFromContentsOfNode(Node*);
61 SelectionType selectionType() const { return m_selectionType; }
63 void setAffinity(EAffinity affinity) { m_affinity = affinity; }
64 EAffinity affinity() const { return m_affinity; }
66 void setBase(const Position&);
67 void setBase(const VisiblePosition&);
68 void setExtent(const Position&);
69 void setExtent(const VisiblePosition&);
71 Position base() const { return m_base; }
72 Position extent() const { return m_extent; }
73 Position start() const { return m_start; }
74 Position end() const { return m_end; }
76 VisiblePosition visibleStart() const { return VisiblePosition(m_start, isRange() ? DOWNSTREAM : affinity()); }
77 VisiblePosition visibleEnd() const { return VisiblePosition(m_end, isRange() ? UPSTREAM : affinity()); }
78 VisiblePosition visibleBase() const { return VisiblePosition(m_base, isRange() ? (isBaseFirst() ? UPSTREAM : DOWNSTREAM) : affinity()); }
79 VisiblePosition visibleExtent() const { return VisiblePosition(m_extent, isRange() ? (isBaseFirst() ? DOWNSTREAM : UPSTREAM) : affinity()); }
81 bool isNone() const { return selectionType() == NoSelection; }
82 bool isCaret() const { return selectionType() == CaretSelection; }
83 bool isRange() const { return selectionType() == RangeSelection; }
84 bool isCaretOrRange() const { return selectionType() != NoSelection; }
85 bool isNonOrphanedRange() const { return isRange() && !start().isOrphan() && !end().isOrphan(); }
86 bool isNonOrphanedCaretOrRange() const { return isCaretOrRange() && !start().isOrphan() && !end().isOrphan(); }
88 bool isBaseFirst() const { return m_baseIsFirst; }
89 bool isDirectional() const { return m_isDirectional; }
90 void setIsDirectional(bool isDirectional) { m_isDirectional = isDirectional; }
92 void appendTrailingWhitespace();
94 bool expandUsingGranularity(TextGranularity granularity);
96 // We don't yet support multi-range selections, so we only ever have one range to return.
97 PassRefPtrWillBeRawPtr<Range> firstRange() const;
99 bool intersectsNode(Node*) const;
101 // FIXME: Most callers probably don't want these functions, but
102 // are using them for historical reasons. toNormalizedRange and
103 // toNormalizedPositions contracts the range around text, and
104 // moves the caret upstream before returning the range/positions.
105 PassRefPtrWillBeRawPtr<Range> toNormalizedRange() const;
106 bool toNormalizedPositions(Position& start, Position& end) const;
108 Element* rootEditableElement() const;
109 bool isContentEditable() const;
110 bool hasEditableStyle() const;
111 bool isContentRichlyEditable() const;
112 // Returns a shadow tree node for legacy shadow trees, a child of the
113 // ShadowRoot node for new shadow trees, or 0 for non-shadow trees.
114 Node* nonBoundaryShadowTreeRootNode() const;
116 VisiblePosition visiblePositionRespectingEditingBoundary(const LayoutPoint& localPoint, Node* targetNode) const;
118 void setWithoutValidation(const Position&, const Position&);
120 // Listener of VisibleSelection modification. didChangeVisibleSelection() will be invoked when base, extent, start
121 // or end is moved to a different position.
123 // Objects implementing |ChangeObserver| interface must outlive the VisibleSelection object.
124 class ChangeObserver : public WillBeGarbageCollectedMixin {
125 WTF_MAKE_NONCOPYABLE(ChangeObserver);
128 virtual ~ChangeObserver();
129 virtual void didChangeVisibleSelection() = 0;
130 virtual void trace(Visitor*) { }
133 void setChangeObserver(ChangeObserver&);
134 void clearChangeObserver();
135 void didChange(); // Fire the change observer, if any.
137 void trace(Visitor*);
139 void validatePositionsIfNeeded();
142 void debugPosition() const;
143 void formatForDebugger(char* buffer, unsigned length) const;
144 void showTreeForThis() const;
148 void validate(TextGranularity = CharacterGranularity);
150 // Support methods for validate()
151 void setBaseAndExtentToDeepEquivalents();
152 void setStartAndEndFromBaseAndExtentRespectingGranularity(TextGranularity);
153 void adjustSelectionToAvoidCrossingShadowBoundaries();
154 void adjustSelectionToAvoidCrossingEditingBoundaries();
155 void updateSelectionType();
157 // We need to store these as Positions because VisibleSelection is
158 // used to store values in editing commands for use when
159 // undoing the command. We need to be able to create a selection that, while currently
160 // invalid, will be valid once the changes are undone.
162 Position m_base; // Where the first click happened
163 Position m_extent; // Where the end click happened
164 Position m_start; // Leftmost position when expanded to respect granularity
165 Position m_end; // Rightmost position when expanded to respect granularity
167 EAffinity m_affinity; // the upstream/downstream affinity of the caret
169 // Oilpan: this reference has a lifetime that is at least as long
171 RawPtrWillBeMember<ChangeObserver> m_changeObserver;
173 // these are cached, can be recalculated by validate()
174 SelectionType m_selectionType; // None, Caret, Range
175 bool m_baseIsFirst : 1; // True if base is before the extent
176 bool m_isDirectional : 1; // Non-directional ignores m_baseIsFirst and selection always extends on shift + arrow key.
179 inline bool operator==(const VisibleSelection& a, const VisibleSelection& b)
181 return a.start() == b.start() && a.end() == b.end() && a.affinity() == b.affinity() && a.isBaseFirst() == b.isBaseFirst()
182 && a.isDirectional() == b.isDirectional();
185 inline bool operator!=(const VisibleSelection& a, const VisibleSelection& b)
193 // Outside the WebCore namespace for ease of invocation from gdb.
194 void showTree(const blink::VisibleSelection&);
195 void showTree(const blink::VisibleSelection*);
198 #endif // VisibleSelection_h