/*

    Copyright (C) Research In Motion Limited 2010. All rights reserved.

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Library General Public

    License as published by the Free Software Foundation; either

    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License

    along with this library; see the file COPYING.LIB.  If not, write to

    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

    Boston, MA 02110-1301, USA.

*/

#ifndef SVGTextQuery_h

#define SVGTextQuery_h

#if ENABLE(SVG)

#include "FloatRect.h"

#include <wtf/Vector.h>

namespace WebCore {

class InlineFlowBox;

class RenderObject;

class RenderStyle;

class SVGInlineTextBox;

struct SVGTextChunkPart;

class SVGTextQuery {

public:

    SVGTextQuery(RenderObject*);

    unsigned numberOfCharacters() const;

    float textLength() const;

    float subStringLength(unsigned startPosition, unsigned length) const;

    FloatPoint startPositionOfCharacter(unsigned position) const;

    FloatPoint endPositionOfCharacter(unsigned position) const;

    float rotationOfCharacter(unsigned position) const;

    FloatRect extentOfCharacter(unsigned position) const;

    int characterNumberAtPosition(const FloatPoint&) const;

    // Public helper struct. Private classes in SVGTextQuery inherit from it.

    struct Data;

private:

    typedef bool (SVGTextQuery::*ProcessTextChunkPartCallback)(Data*, const SVGInlineTextBox*, const SVGTextChunkPart&) const;

    bool executeQuery(Data*, ProcessTextChunkPartCallback) const;

    void collectTextBoxesInFlowBox(InlineFlowBox*);

    float measureCharacterRange(const SVGInlineTextBox*, RenderStyle*, bool isVerticalText, int startPosition, int length) const;

    bool mapStartAndLengthIntoChunkPartCoordinates(Data*, const SVGInlineTextBox*, const SVGTextChunkPart&, int& startPosition, int& endPosition) const;

private:

    bool numberOfCharactersCallback(Data*, const SVGInlineTextBox*, const SVGTextChunkPart&) const;

    bool textLengthCallback(Data*, const SVGInlineTextBox*, const SVGTextChunkPart&) const;

    bool subStringLengthCallback(Data*, const SVGInlineTextBox*, const SVGTextChunkPart&) const;

    bool startPositionOfCharacterCallback(Data*, const SVGInlineTextBox*, const SVGTextChunkPart&) const;

    bool endPositionOfCharacterCallback(Data*, const SVGInlineTextBox*, const SVGTextChunkPart&) const;

    bool rotationOfCharacterCallback(Data*, const SVGInlineTextBox*, const SVGTextChunkPart&) const;

    bool extentOfCharacterCallback(Data*, const SVGInlineTextBox*, const SVGTextChunkPart&) const;

    bool characterNumberAtPositionCallback(Data*, const SVGInlineTextBox*, const SVGTextChunkPart&) const;

private:

    Vector<SVGInlineTextBox*> m_textBoxes;

};

}

#endif

#endif