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#pragma once
21
22#include "FloatRect.h"
23#include "SVGTextFragment.h"
24#include <wtf/Vector.h>
25
26namespace WebCore {
27
28class InlineFlowBox;
29class RenderObject;
30class SVGInlineTextBox;
31
32class SVGTextQuery {
33public:
34 SVGTextQuery(RenderObject*);
35
36 unsigned numberOfCharacters() const;
37 float textLength() const;
38 float subStringLength(unsigned startPosition, unsigned length) const;
39 FloatPoint startPositionOfCharacter(unsigned position) const;
40 FloatPoint endPositionOfCharacter(unsigned position) const;
41 float rotationOfCharacter(unsigned position) const;
42 FloatRect extentOfCharacter(unsigned position) const;
43 int characterNumberAtPosition(const FloatPoint&) const;
44
45 // Public helper struct. Private classes in SVGTextQuery inherit from it.
46 struct Data;
47
48private:
49 typedef bool (SVGTextQuery::*ProcessTextFragmentCallback)(Data*, const SVGTextFragment&) const;
50 bool executeQuery(Data*, ProcessTextFragmentCallback) const;
51
52 void collectTextBoxesInFlowBox(InlineFlowBox*);
53 bool mapStartEndPositionsIntoFragmentCoordinates(Data*, const SVGTextFragment&, unsigned& startPosition, unsigned& endPosition) const;
54 void modifyStartEndPositionsRespectingLigatures(Data*, unsigned& startPosition, unsigned& endPosition) const;
55
56private:
57 bool numberOfCharactersCallback(Data*, const SVGTextFragment&) const;
58 bool textLengthCallback(Data*, const SVGTextFragment&) const;
59 bool subStringLengthCallback(Data*, const SVGTextFragment&) const;
60 bool startPositionOfCharacterCallback(Data*, const SVGTextFragment&) const;
61 bool endPositionOfCharacterCallback(Data*, const SVGTextFragment&) const;
62 bool rotationOfCharacterCallback(Data*, const SVGTextFragment&) const;
63 bool extentOfCharacterCallback(Data*, const SVGTextFragment&) const;
64 bool characterNumberAtPositionCallback(Data*, const SVGTextFragment&) const;
65
66private:
67 Vector<SVGInlineTextBox*> m_textBoxes;
68};
69
70} // namespace WebCore
71