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      1 /*
      2  * Copyright (C) 2013 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef AbstractInlineTextBox_h
     32 #define AbstractInlineTextBox_h
     33 
     34 #include "core/dom/Range.h"
     35 #include "core/rendering/InlineTextBox.h"
     36 #include "core/rendering/RenderText.h"
     37 #include "wtf/HashMap.h"
     38 #include "wtf/RefPtr.h"
     39 
     40 namespace blink {
     41 
     42 class InlineTextBox;
     43 
     44 // High-level abstraction of InlineTextBox to allow the accessibility module to
     45 // get information about InlineTextBoxes without tight coupling.
     46 class AbstractInlineTextBox : public RefCounted<AbstractInlineTextBox> {
     47 private:
     48     AbstractInlineTextBox(RenderText* renderText, InlineTextBox* inlineTextBox)
     49         : m_renderText(renderText)
     50         , m_inlineTextBox(inlineTextBox)
     51     {
     52     }
     53 
     54     static PassRefPtr<AbstractInlineTextBox> getOrCreate(RenderText*, InlineTextBox*);
     55     static void willDestroy(InlineTextBox*);
     56 
     57     friend class RenderText;
     58     friend class InlineTextBox;
     59 
     60 public:
     61     struct WordBoundaries {
     62         WordBoundaries(int startIndex, int endIndex) : startIndex(startIndex), endIndex(endIndex) { }
     63         int startIndex;
     64         int endIndex;
     65     };
     66 
     67     enum Direction {
     68         LeftToRight,
     69         RightToLeft,
     70         TopToBottom,
     71         BottomToTop
     72     };
     73 
     74     RenderText* renderText() const { return m_renderText; }
     75 
     76     PassRefPtr<AbstractInlineTextBox> nextInlineTextBox() const;
     77     LayoutRect bounds() const;
     78     unsigned start() const;
     79     unsigned len() const;
     80     Direction direction() const;
     81     void characterWidths(Vector<float>&) const;
     82     void wordBoundaries(Vector<WordBoundaries>&) const;
     83     String text() const;
     84 
     85 private:
     86     void detach();
     87 
     88     // Weak ptrs; these are nulled when InlineTextBox::destroy() calls AbstractInlineTextBox::willDestroy.
     89     RenderText* m_renderText;
     90     InlineTextBox* m_inlineTextBox;
     91 
     92     typedef HashMap<InlineTextBox*, RefPtr<AbstractInlineTextBox> > InlineToAbstractInlineTextBoxHashMap;
     93     static InlineToAbstractInlineTextBoxHashMap* gAbstractInlineTextBoxMap;
     94 };
     95 
     96 } // namespace blink
     97 
     98 #endif // AbstractInlineTextBox_h
     99