WebCore/Selection.h

   1 /*
   2  * Copyright (C) 2004 Apple Computer, 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 Selection_h
  27 #define Selection_h
  28
  29 #include "TextGranularity.h"
  30 #include "VisiblePosition.h"
  31
  32 namespace WebCore {
  33
  34 class Position;
  35
  36 const EAffinity SEL_DEFAULT_AFFINITY = DOWNSTREAM;
  37
  38 class Selection {
  39 public:
  40     enum EState { NONE, CARET, RANGE };
  41     enum EDirection { FORWARD, BACKWARD, RIGHT, LEFT };
  42
  43     Selection();
  44
  45     Selection(const Position&, EAffinity);
  46     Selection(const Position&, const Position&, EAffinity = SEL_DEFAULT_AFFINITY);
  47
  48     Selection(const Range*, EAffinity = SEL_DEFAULT_AFFINITY);
  49
  50     Selection(const VisiblePosition&);
  51     Selection(const VisiblePosition&, const VisiblePosition&);
  52
  53     static Selection selectionFromContentsOfNode(Node*);
  54
  55     EState state() const { return m_state; }
  56
  57     void setAffinity(EAffinity affinity) { m_affinity = affinity; }
  58     EAffinity affinity() const { return m_affinity; }
  59
  60     void setBase(const Position&);
  61     void setBase(const VisiblePosition&);
  62     void setExtent(const Position&);
  63     void setExtent(const VisiblePosition&);
  64
  65     Position base() const { return m_base; }
  66     Position extent() const { return m_extent; }
  67     Position start() const { return m_start; }
  68     Position end() const { return m_end; }
  69
  70     VisiblePosition visibleStart() const { return VisiblePosition(m_start, isRange() ? DOWNSTREAM : affinity()); }
  71     VisiblePosition visibleEnd() const { return VisiblePosition(m_end, isRange() ? UPSTREAM : affinity()); }
  72
  73     bool isNone() const { return state() == NONE; }
  74     bool isCaret() const { return state() == CARET; }
  75     bool isRange() const { return state() == RANGE; }
  76     bool isCaretOrRange() const { return state() != NONE; }
  77
  78     bool isBaseFirst() const { return m_baseIsFirst; }
  79
  80     void appendTrailingWhitespace();
  81
  82     bool expandUsingGranularity(TextGranularity granularity);
  83     TextGranularity granularity() const { return m_granularity; }
  84
  85     PassRefPtr<Range> toRange() const;
  86
  87     Element* rootEditableElement() const;
  88     bool isContentEditable() const;
  89     bool isContentRichlyEditable() const;
  90     Node* shadowTreeRootNode() const;
  91
  92     void debugPosition() const;
  93
  94 #ifndef NDEBUG
  95     void formatForDebugger(char* buffer, unsigned length) const;
  96     void showTreeForThis() const;
  97 #endif
  98
  99     void setWithoutValidation(const Position&, const Position&);
 100
 101 private:
 102     void validate();
 103     void adjustForEditableContent();
 104
 105     Position m_base;                  // base position for the selection
 106     Position m_extent;                // extent position for the selection
 107     Position m_start;                 // start position for the selection
 108     Position m_end;                   // end position for the selection
 109
 110     EAffinity m_affinity;             // the upstream/downstream affinity of the caret
 111     TextGranularity m_granularity;   // granularity of start/end selection
 112
 113     // these are cached, can be recalculated by validate()
 114     EState m_state;                   // the state of the selection
 115     bool m_baseIsFirst;               // true if base is before the extent
 116 };
 117
 118 inline bool operator==(const Selection& a, const Selection& b)
 119 {
 120     return a.start() == b.start() && a.end() == b.end() && a.affinity() == b.affinity() && a.granularity() == b.granularity() && a.isBaseFirst() == b.isBaseFirst();
 121 }
 122
 123 inline bool operator!=(const Selection& a, const Selection& b)
 124 {
 125     return !(a == b);
 126 }
 127
 128 } // namespace WebCore
 129
 130 #ifndef NDEBUG
 131 // Outside the WebCore namespace for ease of invocation from gdb.
 132 void showTree(const WebCore::Selection&);
 133 void showTree(const WebCore::Selection*);
 134 #endif
 135
 136 #endif // Selection_h