~ubuntu-branches/ubuntu/maverick/webkit/maverick

/*

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

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

 * Copyright (C) 2003, 2004, 2005, 2006, 2007 Apple 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., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 *

 */

#ifndef RenderFlow_h

#define RenderFlow_h

#include "RenderContainer.h"

namespace WebCore {

/**

 * all geometry managing stuff is only in the block elements.

 *

 * Inline elements don't layout themselves, but the whole paragraph

 * gets flowed by the surrounding block element. This is, because

 * one needs to know the whole paragraph to calculate bidirectional

 * behaviour of text, so putting the layouting routines in the inline

 * elements is impossible.

 */

class RenderFlow : public RenderContainer {

public:

    RenderFlow(Node* node)

        : RenderContainer(node)

        , m_continuation(0)

        , m_firstLineBox(0)

        , m_lastLineBox(0)

        , m_lineHeight(-1)

        , m_childrenInline(true)

        , m_firstLine(false)

        , m_clearStatus(CNONE)

        , m_topMarginQuirk(false) 

        , m_bottomMarginQuirk(false)

        , m_hasMarkupTruncation(false)

        , m_selectionState(SelectionNone)

        , m_hasColumns(false)

        , m_isContinuation(false)

    {

    }

#ifndef NDEBUG

    virtual ~RenderFlow();

#endif

    virtual RenderFlow* continuation() const { return m_continuation; }

    void setContinuation(RenderFlow* c) { m_continuation = c; }

    RenderFlow* continuationBefore(RenderObject* beforeChild);

    void addChildWithContinuation(RenderObject* newChild, RenderObject* beforeChild);

    virtual void addChildToFlow(RenderObject* newChild, RenderObject* beforeChild) = 0;

    virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0);

    static RenderFlow* createAnonymousFlow(Document*, RenderStyle*);

    void extractLineBox(InlineFlowBox*);

    void attachLineBox(InlineFlowBox*);

    void removeLineBox(InlineFlowBox*);

    void deleteLineBoxes();

    virtual void destroy();

    virtual void dirtyLinesFromChangedChild(RenderObject* child);

    virtual short lineHeight(bool firstLine, bool isRootLineBox = false) const;

    InlineFlowBox* firstLineBox() const { return m_firstLineBox; }

    InlineFlowBox* lastLineBox() const { return m_lastLineBox; }

    virtual InlineBox* createInlineBox(bool makePlaceHolderBox, bool isRootLineBox, bool isOnlyRun=false);

    virtual void dirtyLineBoxes(bool fullLayout, bool isRootLineBox = false);

    void paintLines(PaintInfo&, int tx, int ty);

    bool hitTestLines(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);

    virtual IntRect absoluteClippedOverflowRect();

    virtual int lowestPosition(bool includeOverflowInterior = true, bool includeSelf = true) const;

    virtual int rightmostPosition(bool includeOverflowInterior = true, bool includeSelf = true) const;

    virtual int leftmostPosition(bool includeOverflowInterior = true, bool includeSelf = true) const;

    virtual IntRect caretRect(int offset, EAffinity = UPSTREAM, int* extraWidthToEndOfLine = 0);

    virtual void addFocusRingRects(GraphicsContext*, int tx, int ty);

    void paintOutlineForLine(GraphicsContext*, int tx, int ty, const IntRect& prevLine, const IntRect& thisLine, const IntRect& nextLine);

    void paintOutline(GraphicsContext*, int tx, int ty);

    virtual bool hasColumns() const { return m_hasColumns; }

    virtual bool isWordBreak() const { ASSERT(isInlineFlow()); return false; }

    void checkConsistency() const;

private:

    // An inline can be split with blocks occurring in between the inline content.

    // When this occurs we need a pointer to our next object.  We can basically be

    // split into a sequence of inlines and blocks.  The continuation will either be

    // an anonymous block (that houses other blocks) or it will be an inline flow.

    RenderFlow* m_continuation;

protected:

    // For block flows, each box represents the root inline box for a line in the

    // paragraph.

    // For inline flows, each box represents a portion of that inline.

    InlineFlowBox* m_firstLineBox;

    InlineFlowBox* m_lastLineBox;

    mutable short m_lineHeight;

    // These bitfields are moved here from subclasses to pack them together

    // from RenderBlock

    bool m_childrenInline : 1;

    bool m_firstLine : 1;

    unsigned m_clearStatus  : 2; // EClear

    bool m_topMarginQuirk : 1;

    bool m_bottomMarginQuirk : 1;

    bool m_hasMarkupTruncation : 1;

    unsigned m_selectionState : 3; // SelectionState

    bool m_hasColumns : 1;

    // from RenderInline

    bool m_isContinuation : 1; // Whether or not we're a continuation of an inline.

};

#ifdef NDEBUG

inline void RenderFlow::checkConsistency() const

{

}

#endif

} // namespace WebCore

#endif // RenderFlow_h