1 /* 2 * Copyright (C) 2004, 2008 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef VisiblePosition_h 27 #define VisiblePosition_h 28 29 #include "core/dom/Position.h" 30 #include "core/editing/EditingBoundary.h" 31 #include "platform/heap/Handle.h" 32 #include "platform/text/TextDirection.h" 33 34 namespace WebCore { 35 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 41 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 48 49 class InlineBox; 50 class Node; 51 52 class VisiblePosition FINAL { 53 DISALLOW_ALLOCATION(); 54 public: 55 // NOTE: UPSTREAM affinity will be used only if pos is at end of a wrapped line, 56 // otherwise it will be converted to DOWNSTREAM VisiblePosition()57 VisiblePosition() : m_affinity(VP_DEFAULT_AFFINITY) { } 58 explicit VisiblePosition(const Position&, EAffinity = VP_DEFAULT_AFFINITY); 59 explicit VisiblePosition(const PositionWithAffinity&); 60 clear()61 void clear() { m_deepPosition.clear(); } 62 isNull()63 bool isNull() const { return m_deepPosition.isNull(); } isNotNull()64 bool isNotNull() const { return m_deepPosition.isNotNull(); } isOrphan()65 bool isOrphan() const { return m_deepPosition.isOrphan(); } 66 deepEquivalent()67 Position deepEquivalent() const { return m_deepPosition; } affinity()68 EAffinity affinity() const { ASSERT(m_affinity == UPSTREAM || m_affinity == DOWNSTREAM); return m_affinity; } setAffinity(EAffinity affinity)69 void setAffinity(EAffinity affinity) { m_affinity = affinity; } 70 71 // FIXME: Change the following functions' parameter from a boolean to StayInEditableContent. 72 73 // next() and previous() will increment/decrement by a character cluster. 74 VisiblePosition next(EditingBoundaryCrossingRule = CanCrossEditingBoundary) const; 75 VisiblePosition previous(EditingBoundaryCrossingRule = CanCrossEditingBoundary) const; 76 VisiblePosition honorEditingBoundaryAtOrBefore(const VisiblePosition&) const; 77 VisiblePosition honorEditingBoundaryAtOrAfter(const VisiblePosition&) const; 78 VisiblePosition skipToStartOfEditingBoundary(const VisiblePosition&) const; 79 VisiblePosition skipToEndOfEditingBoundary(const VisiblePosition&) const; 80 81 VisiblePosition left(bool stayInEditableContent = false) const; 82 VisiblePosition right(bool stayInEditableContent = false) const; 83 84 UChar32 characterAfter() const; characterBefore()85 UChar32 characterBefore() const { return previous().characterAfter(); } 86 87 // FIXME: This does not handle [table, 0] correctly. rootEditableElement()88 Element* rootEditableElement() const { return m_deepPosition.isNotNull() ? m_deepPosition.deprecatedNode()->rootEditableElement() : 0; } 89 getInlineBoxAndOffset(InlineBox * & inlineBox,int & caretOffset)90 void getInlineBoxAndOffset(InlineBox*& inlineBox, int& caretOffset) const 91 { 92 m_deepPosition.getInlineBoxAndOffset(m_affinity, inlineBox, caretOffset); 93 } 94 95 // Rect is local to the returned renderer 96 LayoutRect 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; 102 103 void trace(Visitor*); 104 105 #ifndef NDEBUG 106 void debugPosition(const char* msg = "") const; 107 void formatForDebugger(char* buffer, unsigned length) const; 108 void showTreeForThis() const; 109 #endif 110 111 private: 112 void init(const Position&, EAffinity); 113 Position canonicalPosition(const Position&); 114 115 Position leftVisuallyDistinctCandidate() const; 116 Position rightVisuallyDistinctCandidate() const; 117 118 Position m_deepPosition; 119 EAffinity m_affinity; 120 }; 121 122 // FIXME: This shouldn't ignore affinity. 123 inline bool operator==(const VisiblePosition& a, const VisiblePosition& b) 124 { 125 return a.deepEquivalent() == b.deepEquivalent(); 126 } 127 128 inline bool operator!=(const VisiblePosition& a, const VisiblePosition& b) 129 { 130 return !(a == b); 131 } 132 133 PassRefPtrWillBeRawPtr<Range> makeRange(const VisiblePosition&, const VisiblePosition&); 134 bool setStart(Range*, const VisiblePosition&); 135 bool setEnd(Range*, const VisiblePosition&); 136 VisiblePosition startVisiblePosition(const Range*, EAffinity); 137 138 Element* enclosingBlockFlowElement(const VisiblePosition&); 139 140 bool isFirstVisiblePositionInNode(const VisiblePosition&, const Node*); 141 bool isLastVisiblePositionInNode(const VisiblePosition&, const Node*); 142 143 } // namespace WebCore 144 145 #ifndef NDEBUG 146 // Outside the WebCore namespace for ease of invocation from gdb. 147 void showTree(const WebCore::VisiblePosition*); 148 void showTree(const WebCore::VisiblePosition&); 149 #endif 150 151 #endif // VisiblePosition_h 152