SVGLocatable.h   [plain text]

/*
    Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
                  2004, 2005, 2007 Rob Buis <buis@kde.org>
    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 SVGLocatable_h
#define SVGLocatable_h

#if ENABLE(SVG)
#include "AffineTransform.h"
#include "ExceptionCode.h"

namespace WebCore {

class FloatRect;
class SVGElement;

class SVGLocatable {
public:
    SVGLocatable();
    virtual ~SVGLocatable();

    // 'SVGLocatable' functions
    virtual SVGElement* nearestViewportElement() const = 0;
    virtual SVGElement* farthestViewportElement() const = 0;

    enum StyleUpdateStrategy { AllowStyleUpdate, DisallowStyleUpdate };
    
    virtual FloatRect getBBox(StyleUpdateStrategy) const = 0;
    virtual AffineTransform getCTM(StyleUpdateStrategy) const = 0;
    virtual AffineTransform getScreenCTM(StyleUpdateStrategy) const = 0;
    AffineTransform getTransformToElement(SVGElement*, ExceptionCode&, StyleUpdateStrategy = AllowStyleUpdate) const;

    static SVGElement* nearestViewportElement(const SVGElement*);
    static SVGElement* farthestViewportElement(const SVGElement*);

    enum CTMScope {
        NearestViewportScope, // Used for getCTM()
        ScreenScope // Used for getScreenCTM()
    };

protected:
    virtual AffineTransform localCoordinateSpaceTransform(SVGLocatable::CTMScope) const { return AffineTransform(); }

    static FloatRect getBBox(const SVGElement*, StyleUpdateStrategy);
    static AffineTransform computeCTM(const SVGElement*, CTMScope, StyleUpdateStrategy);
};

} // namespace WebCore

#endif // ENABLE(SVG)
#endif // SVGLocatable_h