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      1 /*
      2  * Copyright (C) 2007 Apple Inc.  All rights reserved.
      3  * Copyright (C) 2012 Google Inc.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *
      9  * 1.  Redistributions of source code must retain the above copyright
     10  *     notice, this list of conditions and the following disclaimer.
     11  * 2.  Redistributions in binary form must reproduce the above copyright
     12  *     notice, this list of conditions and the following disclaimer in the
     13  *     documentation and/or other materials provided with the distribution.
     14  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     15  *     its contributors may be used to endorse or promote products derived
     16  *     from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     21  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 
     31 #ifndef DOMSelection_h
     32 #define DOMSelection_h
     33 
     34 #include "bindings/core/v8/ScriptWrappable.h"
     35 #include "core/frame/DOMWindowProperty.h"
     36 #include "platform/heap/Handle.h"
     37 #include "wtf/Forward.h"
     38 #include "wtf/PassRefPtr.h"
     39 #include "wtf/RefCounted.h"
     40 
     41 namespace blink {
     42 
     43 class ExceptionState;
     44 class Node;
     45 class Position;
     46 class Range;
     47 class TreeScope;
     48 class VisibleSelection;
     49 
     50 class DOMSelection FINAL : public RefCountedWillBeGarbageCollected<DOMSelection>, public ScriptWrappable, public DOMWindowProperty {
     51     DEFINE_WRAPPERTYPEINFO();
     52     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DOMSelection);
     53 public:
     54     static PassRefPtrWillBeRawPtr<DOMSelection> create(const TreeScope* treeScope)
     55     {
     56         return adoptRefWillBeNoop(new DOMSelection(treeScope));
     57     }
     58 
     59     void clearTreeScope();
     60 
     61     // Safari Selection Object API
     62     // These methods return the valid equivalents of internal editing positions.
     63     Node* baseNode() const;
     64     int baseOffset() const;
     65     Node* extentNode() const;
     66     int extentOffset() const;
     67     String type() const;
     68     void setBaseAndExtent(Node* baseNode, int baseOffset, Node* extentNode, int extentOffset, ExceptionState&);
     69     void modify(const String& alter, const String& direction, const String& granularity);
     70 
     71     // Mozilla Selection Object API
     72     // In Firefox, anchor/focus are the equal to the start/end of the selection,
     73     // but reflect the direction in which the selection was made by the user. That does
     74     // not mean that they are base/extent, since the base/extent don't reflect
     75     // expansion.
     76     // These methods return the valid equivalents of internal editing positions.
     77     Node* anchorNode() const;
     78     int anchorOffset() const;
     79     Node* focusNode() const;
     80     int focusOffset() const;
     81     bool isCollapsed() const;
     82     int rangeCount() const;
     83     void collapse(Node*, int offset, ExceptionState&);
     84     void collapseToEnd(ExceptionState&);
     85     void collapseToStart(ExceptionState&);
     86     void extend(Node*, int offset, ExceptionState&);
     87     PassRefPtrWillBeRawPtr<Range> getRangeAt(int, ExceptionState&);
     88     void removeAllRanges();
     89     void addRange(Range*);
     90     void deleteFromDocument();
     91     bool containsNode(const Node*, bool partlyContained) const;
     92     void selectAllChildren(Node*, ExceptionState&);
     93 
     94     String toString();
     95 
     96     // Microsoft Selection Object API
     97     void empty();
     98 
     99     virtual void trace(Visitor*) OVERRIDE;
    100 
    101 private:
    102     explicit DOMSelection(const TreeScope*);
    103 
    104     // Convenience method for accessors, does not check m_frame present.
    105     const VisibleSelection& visibleSelection() const;
    106 
    107     Node* shadowAdjustedNode(const Position&) const;
    108     int shadowAdjustedOffset(const Position&) const;
    109 
    110     bool isValidForPosition(Node*) const;
    111 
    112     void addConsoleError(const String& message);
    113 
    114     RawPtrWillBeMember<const TreeScope> m_treeScope;
    115 };
    116 
    117 } // namespace blink
    118 
    119 #endif // DOMSelection_h
    120