svginlinetextbox.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 2007 Rob Buis <[e-mail]>
 *           (C) 2007 Nikolas Zimmermann <[e-mail]>
 *
 * 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 SVGInlineTextBox_h
#define SVGInlineTextBox_h

#if ENABLE(SVG)
#include "InlineTextBox.h"

namespace WebCore {

    class SVGChar;
    class SVGRootInlineBox;
    class SVGTextDecorationInfo;

    class SVGInlineTextBox : public InlineTextBox {
    public:
        SVGInlineTextBox(RenderObject* obj);

        virtual int height() const { return m_height; }
        void setHeight(int h) { m_height = h; }

        virtual int selectionTop();
        virtual int selectionHeight();

        virtual int offsetForPosition(int x, bool includePartialGlyphs = true) const;
        virtual int positionForOffset(int offset) const;

        virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty);
        virtual IntRect selectionRect(int absx, int absy, int startPos, int endPos);

        // SVGs custom paint text method
        void paintCharacters(RenderObject::PaintInfo&, int tx, int ty, const SVGChar&, const UChar* chars, int length, SVGPaintServer*);

        // SVGs custom paint selection method
        void paintSelection(int boxStartOffset, const SVGChar&, const UChar*, int length, GraphicsContext*, RenderStyle*, const Font&);

        // SVGs custom paint decoration method
        void paintDecoration(ETextDecoration, GraphicsContext*, int tx, int ty, int width, const SVGChar&, const SVGTextDecorationInfo&);
 
        SVGRootInlineBox* svgRootInlineBox() const;

        // Helper functions shared with SVGRootInlineBox     
        float calculateGlyphWidth(RenderStyle* style, int offset, int extraCharsAvailable, int& charsConsumed, String& glyphName) const;
        float calculateGlyphHeight(RenderStyle*, int offset, int extraCharsAvailable) const;

        FloatRect calculateGlyphBoundaries(RenderStyle*, int offset, const SVGChar&) const;
        SVGChar* closestCharacterToPosition(int x, int y, int& offset) const;

    private:
        friend class RenderSVGInlineText;
        bool svgCharacterHitsPosition(int x, int y, int& offset) const;
        
        int m_height;
    };

} // namespace WebCore

#endif
#endif // SVGInlineTextBox_h