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26 #ifndef VisiblePosition_h
27 #define VisiblePosition_h
29 #include "EditingBoundary.h"
32 #include "TextDirection.h"
36 // VisiblePosition default affinity is downstream because
37 // the callers do not really care (they just want the
38 // deep position without regard to line position), and this
39 // is cheaper than UPSTREAM
40 #define VP_DEFAULT_AFFINITY DOWNSTREAM
42 // Callers who do not know where on the line the position is,
43 // but would like UPSTREAM if at a line break or DOWNSTREAM
44 // otherwise, need a clear way to specify that. The
45 // constructors auto-correct UPSTREAM to DOWNSTREAM if the
46 // position is not at a line break.
47 #define VP_UPSTREAM_IF_POSSIBLE UPSTREAM
51 class VisiblePosition {
53 // NOTE: UPSTREAM affinity will be used only if pos is at end of a wrapped line,
54 // otherwise it will be converted to DOWNSTREAM
55 VisiblePosition() : m_affinity(VP_DEFAULT_AFFINITY) { }
56 VisiblePosition(const Position&, EAffinity = VP_DEFAULT_AFFINITY);
58 void clear() { m_deepPosition.clear(); }
60 bool isNull() const { return m_deepPosition.isNull(); }
61 bool isNotNull() const { return m_deepPosition.isNotNull(); }
62 bool isOrphan() const { return m_deepPosition.isOrphan(); }
64 Position deepEquivalent() const { return m_deepPosition; }
65 EAffinity affinity() const { ASSERT(m_affinity == UPSTREAM || m_affinity == DOWNSTREAM); return m_affinity; }
66 void setAffinity(EAffinity affinity) { m_affinity = affinity; }
68 // FIXME: Change the following functions' parameter from a boolean to StayInEditableContent.
70 // next() and previous() will increment/decrement by a character cluster.
71 VisiblePosition next(EditingBoundaryCrossingRule = CanCrossEditingBoundary) const;
72 VisiblePosition previous(EditingBoundaryCrossingRule = CanCrossEditingBoundary) const;
73 VisiblePosition honorEditingBoundaryAtOrBefore(const VisiblePosition&) const;
74 VisiblePosition honorEditingBoundaryAtOrAfter(const VisiblePosition&) const;
76 VisiblePosition left(bool stayInEditableContent = false) const;
77 VisiblePosition right(bool stayInEditableContent = false) const;
79 UChar32 characterAfter() const;
80 UChar32 characterBefore() const { return previous().characterAfter(); }
82 // FIXME: This does not handle [table, 0] correctly.
83 Element* rootEditableElement() const { return m_deepPosition.isNotNull() ? m_deepPosition.deprecatedNode()->rootEditableElement() : 0; }
85 void getInlineBoxAndOffset(InlineBox*& inlineBox, int& caretOffset) const
87 m_deepPosition.getInlineBoxAndOffset(m_affinity, inlineBox, caretOffset);
90 void getInlineBoxAndOffset(TextDirection primaryDirection, InlineBox*& inlineBox, int& caretOffset) const
92 m_deepPosition.getInlineBoxAndOffset(m_affinity, primaryDirection, inlineBox, caretOffset);
95 // Rect is local to the returned renderer
96 IntRect localCaretRect(RenderObject*&) const;
97 // Bounds of (possibly transformed) caret in absolute coords
98 IntRect absoluteCaretBounds() const;
99 // Abs x/y position of the caret ignoring transforms.
100 // FIXME: navigation with transforms should be smarter.
101 int lineDirectionPointForBlockDirectionNavigation() const;
104 void debugPosition(const char* msg = "") const;
105 void formatForDebugger(char* buffer, unsigned length) const;
106 void showTreeForThis() const;
110 void init(const Position&, EAffinity);
111 Position canonicalPosition(const Position&);
113 Position leftVisuallyDistinctCandidate() const;
114 Position rightVisuallyDistinctCandidate() const;
116 Position m_deepPosition;
117 EAffinity m_affinity;
120 // FIXME: This shouldn't ignore affinity.
121 inline bool operator==(const VisiblePosition& a, const VisiblePosition& b)
123 return a.deepEquivalent() == b.deepEquivalent();
126 inline bool operator!=(const VisiblePosition& a, const VisiblePosition& b)
131 PassRefPtr<Range> makeRange(const VisiblePosition&, const VisiblePosition&);
132 bool setStart(Range*, const VisiblePosition&);
133 bool setEnd(Range*, const VisiblePosition&);
134 VisiblePosition startVisiblePosition(const Range*, EAffinity);
135 VisiblePosition endVisiblePosition(const Range*, EAffinity);
137 Element* enclosingBlockFlowElement(const VisiblePosition&);
139 bool isFirstVisiblePositionInNode(const VisiblePosition&, const Node*);
140 bool isLastVisiblePositionInNode(const VisiblePosition&, const Node*);
142 } // namespace WebCore
145 // Outside the WebCore namespace for ease of invocation from gdb.
146 void showTree(const WebCore::VisiblePosition*);
147 void showTree(const WebCore::VisiblePosition&);
150 #endif // VisiblePosition_h