1 /*

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

     3 

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

     5     modify it under the terms of the GNU Library General Public

     6     License as published by the Free Software Foundation; either

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

     8 

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

    10     but WITHOUT ANY WARRANTY; without even the implied warranty of

    11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    12     Library General Public License for more details.

    13 

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

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

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

    17     Boston, MA 02110-1301, USA.

    18 */

    19 

    20 #ifndef SVGTextQuery_h

    21 #define SVGTextQuery_h

    22 

    23 #if ENABLE(SVG)

    24 #include "FloatRect.h"

    25 #include <wtf/Vector.h>

    26 

    27 namespace WebCore {

    28 

    29 class InlineFlowBox;

    30 class RenderObject;

    31 class RenderStyle;

    32 class SVGInlineTextBox;

    33 struct SVGTextChunkPart;

    34 

    35 class SVGTextQuery {

    36 public:

    37     SVGTextQuery(RenderObject*);

    38 

    39     unsigned numberOfCharacters() const;

    40     float textLength() const;

    41     float subStringLength(unsigned startPosition, unsigned length) const;

    42     FloatPoint startPositionOfCharacter(unsigned position) const;

    43     FloatPoint endPositionOfCharacter(unsigned position) const;

    44     float rotationOfCharacter(unsigned position) const;

    45     FloatRect extentOfCharacter(unsigned position) const;

    46     int characterNumberAtPosition(const FloatPoint&) const;

    47 

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

    49     struct Data;

    50 

    51 private:

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

    53     bool executeQuery(Data*, ProcessTextChunkPartCallback) const;

    54 

    55     void collectTextBoxesInFlowBox(InlineFlowBox*);

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

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

    58 

    59 private:

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

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

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

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

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

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

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

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

    68 

    69 private:

    70     Vector<SVGInlineTextBox*> m_textBoxes;

    71 };

    72 

    73 }

    74 

    75 #endif

    76 #endif