xref: /external/chromium_org/third_party/WebKit/Source/core/rendering/AbstractInlineTextBox.h

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#ifndef AbstractInlineTextBox_h
#define AbstractInlineTextBox_h

#include "core/dom/Range.h"
#include "core/rendering/InlineTextBox.h"
#include "core/rendering/RenderText.h"
#include "wtf/HashMap.h"
#include "wtf/RefPtr.h"

namespace blink {

class InlineTextBox;

// High-level abstraction of InlineTextBox to allow the accessibility module to
// get information about InlineTextBoxes without tight coupling.
class AbstractInlineTextBox : public RefCounted<AbstractInlineTextBox> {
private:
    AbstractInlineTextBox(RenderText* renderText, InlineTextBox* inlineTextBox)
        : m_renderText(renderText)
        , m_inlineTextBox(inlineTextBox)
    {
    }

    static PassRefPtr<AbstractInlineTextBox> getOrCreate(RenderText*, InlineTextBox*);
    static void willDestroy(InlineTextBox*);

    friend class RenderText;
    friend class InlineTextBox;

public:
    struct WordBoundaries {
        WordBoundaries(int startIndex, int endIndex) : startIndex(startIndex), endIndex(endIndex) { }
        int startIndex;
        int endIndex;
    };

    enum Direction {
        LeftToRight,
        RightToLeft,
        TopToBottom,
        BottomToTop
    };

    RenderText* renderText() const { return m_renderText; }

    PassRefPtr<AbstractInlineTextBox> nextInlineTextBox() const;
    LayoutRect bounds() const;
    unsigned start() const;
    unsigned len() const;
    Direction direction() const;
    void characterWidths(Vector<float>&) const;
    void wordBoundaries(Vector<WordBoundaries>&) const;
    String text() const;

private:
    void detach();

    // Weak ptrs; these are nulled when InlineTextBox::destroy() calls AbstractInlineTextBox::willDestroy.
    RenderText* m_renderText;
    InlineTextBox* m_inlineTextBox;

    typedef HashMap<InlineTextBox*, RefPtr<AbstractInlineTextBox> > InlineToAbstractInlineTextBoxHashMap;
    static InlineToAbstractInlineTextBoxHashMap* gAbstractInlineTextBoxMap;
};

} // namespace blink

#endif // AbstractInlineTextBox_h