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#include "core/rendering/svg/SVGTextFragment.h"
24#include "platform/geometry/FloatPoint.h"
25#include "platform/geometry/FloatRect.h"
26#include "wtf/Vector.h"
27
28namespace blink {
29
30class InlineFlowBox;
31class RenderObject;
32class SVGInlineTextBox;
33
34class SVGTextQuery {
35public:
36    SVGTextQuery(RenderObject*);
37
38    unsigned numberOfCharacters() const;
39    float textLength() const;
40    float subStringLength(unsigned startPosition, unsigned length) const;
41    FloatPoint startPositionOfCharacter(unsigned position) const;
42    FloatPoint endPositionOfCharacter(unsigned position) const;
43    float rotationOfCharacter(unsigned position) const;
44    FloatRect extentOfCharacter(unsigned position) const;
45    int characterNumberAtPosition(const FloatPoint&) const;
46
47    // Public helper struct. Private classes in SVGTextQuery inherit from it.
48    struct Data;
49
50private:
51    typedef bool (SVGTextQuery::*ProcessTextFragmentCallback)(Data*, const SVGTextFragment&) const;
52    bool executeQuery(Data*, ProcessTextFragmentCallback) const;
53
54    void collectTextBoxesInFlowBox(InlineFlowBox*);
55    bool mapStartEndPositionsIntoFragmentCoordinates(Data*, const SVGTextFragment&, int& startPosition, int& endPosition) const;
56    void modifyStartEndPositionsRespectingLigatures(Data*, const SVGTextFragment&, int& startPosition, int& endPosition) const;
57
58private:
59    bool numberOfCharactersCallback(Data*, const SVGTextFragment&) const;
60    bool textLengthCallback(Data*, const SVGTextFragment&) const;
61    bool subStringLengthCallback(Data*, const SVGTextFragment&) const;
62    bool startPositionOfCharacterCallback(Data*, const SVGTextFragment&) const;
63    bool endPositionOfCharacterCallback(Data*, const SVGTextFragment&) const;
64    bool rotationOfCharacterCallback(Data*, const SVGTextFragment&) const;
65    bool extentOfCharacterCallback(Data*, const SVGTextFragment&) const;
66    bool characterNumberAtPositionCallback(Data*, const SVGTextFragment&) const;
67
68private:
69    Vector<SVGInlineTextBox*> m_textBoxes;
70};
71
72}
73
74#endif
75