/*

 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)

 *           (C) 1999 Antti Koivisto (koivisto@kde.org)

 * Copyright (C) 2003, 2006, 2007, 2009 Apple Inc. All rights reserved.

 * Copyright (C) 2010 Google Inc. 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 RenderBoxModelObject_h

#define RenderBoxModelObject_h

#include "RenderObject.h"

namespace WebCore {

// Values for vertical alignment.

const int PositionTop = -0x7fffffff;

const int PositionBottom = 0x7fffffff;

const int PositionUndefined = 0x80000000;

// This class is the base for all objects that adhere to the CSS box model as described

// at http://www.w3.org/TR/CSS21/box.html

class RenderBoxModelObject : public RenderObject {

public:

    RenderBoxModelObject(Node*);

    virtual ~RenderBoxModelObject();

    virtual void destroy();

    int relativePositionOffsetX() const;

    int relativePositionOffsetY() const;

    IntSize relativePositionOffset() const { return IntSize(relativePositionOffsetX(), relativePositionOffsetY()); }

    // IE extensions. Used to calculate offsetWidth/Height.  Overridden by inlines (RenderFlow)

    // to return the remaining width on a given line (and the height of a single line).

    virtual int offsetLeft() const;

    virtual int offsetTop() const;

    virtual int offsetWidth() const = 0;

    virtual int offsetHeight() const = 0;

    virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle);

    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);

    virtual void updateBoxModelInfoFromStyle();

    bool hasSelfPaintingLayer() const;

    RenderLayer* layer() const { return m_layer; }

    virtual bool requiresLayer() const { return isRoot() || isPositioned() || isRelPositioned() || isTransparent() || hasOverflowClip() || hasTransform() || hasMask() || hasReflection() || style()->specifiesColumns(); }

    // This will work on inlines to return the bounding box of all of the lines' border boxes.

    virtual IntRect borderBoundingBox() const = 0;

    // Virtual since table cells override

    virtual int paddingTop(bool includeIntrinsicPadding = true) const;

    virtual int paddingBottom(bool includeIntrinsicPadding = true) const;

    virtual int paddingLeft(bool includeIntrinsicPadding = true) const;

    virtual int paddingRight(bool includeIntrinsicPadding = true) const;

    virtual int borderTop() const { return style()->borderTopWidth(); }

    virtual int borderBottom() const { return style()->borderBottomWidth(); }

    virtual int borderLeft() const { return style()->borderLeftWidth(); }

    virtual int borderRight() const { return style()->borderRightWidth(); }

    int borderAndPaddingHeight() const { return borderTop() + borderBottom() + paddingTop() + paddingBottom(); }

    int borderAndPaddingWidth() const { return borderLeft() + borderRight() + paddingLeft() + paddingRight(); }

    virtual int marginTop() const = 0;

    virtual int marginBottom() const = 0;

    virtual int marginLeft() const = 0;

    virtual int marginRight() const = 0;

    bool hasHorizontalBordersPaddingOrMargin() const { return hasHorizontalBordersOrPadding() || marginLeft() != 0 || marginRight() != 0; }

    bool hasHorizontalBordersOrPadding() const { return borderLeft() != 0 || borderRight() != 0 || paddingLeft() != 0 || paddingRight() != 0; }

    virtual int containingBlockWidthForContent() const;

    virtual void childBecameNonInline(RenderObject* /*child*/) { }

    void paintBorder(GraphicsContext*, int tx, int ty, int w, int h, const RenderStyle*, bool begin = true, bool end = true);

    bool paintNinePieceImage(GraphicsContext*, int tx, int ty, int w, int h, const RenderStyle*, const NinePieceImage&, CompositeOperator = CompositeSourceOver);

    void paintBoxShadow(GraphicsContext*, int tx, int ty, int w, int h, const RenderStyle*, ShadowStyle, bool begin = true, bool end = true);

    void paintFillLayerExtended(const PaintInfo&, const Color&, const FillLayer*, int tx, int ty, int width, int height, InlineFlowBox* = 0, CompositeOperator = CompositeSourceOver, RenderObject* backgroundObject = 0);

    // The difference between this inline's baseline position and the line's baseline position.

    int verticalPosition(bool firstLine) const;

    // Called by RenderObject::destroy() (and RenderWidget::destroy()) and is the only way layers should ever be destroyed

    void destroyLayer();

    void highQualityRepaintTimerFired(Timer<RenderBoxModelObject>*);

    virtual void setSelectionState(SelectionState s);

protected:

    void calculateBackgroundImageGeometry(const FillLayer*, int tx, int ty, int w, int h, IntRect& destRect, IntPoint& phase, IntSize& tileSize);

    bool shouldPaintAtLowQuality(GraphicsContext*, Image*, const IntSize&);

private:

    virtual bool isBoxModelObject() const { return true; }

    IntSize calculateFillTileSize(const FillLayer*, IntSize scaledSize) const;

    void clipBorderSidePolygon(GraphicsContext*, const IntRect&, const IntSize& topLeft, const IntSize& topRight, const IntSize& bottomLeft, const IntSize& bottomRight, const BoxSide side, bool firstEdgeMatches, bool secondEdgeMatches, const RenderStyle* style);

    friend class RenderView;

    RenderLayer* m_layer;

    // Used to store state between styleWillChange and styleDidChange

    static bool s_wasFloating;

    static bool s_hadLayer;

    static bool s_layerWasSelfPainting;

};

inline RenderBoxModelObject* toRenderBoxModelObject(RenderObject* object)

{ 

    ASSERT(!object || object->isBoxModelObject());

    return static_cast<RenderBoxModelObject*>(object);

}

inline const RenderBoxModelObject* toRenderBoxModelObject(const RenderObject* object)

{ 

    ASSERT(!object || object->isBoxModelObject());

    return static_cast<const RenderBoxModelObject*>(object);

}

// This will catch anyone doing an unnecessary cast.

void toRenderBoxModelObject(const RenderBoxModelObject*);

} // namespace WebCore

#endif // RenderBoxModelObject_h