render_layer.h

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/*
 * Copyright (C) 2003 Apple Computer, Inc.
 *
 * Portions are Copyright (C) 1998 Netscape Communications Corporation.
 *
 * Other contributors:
 *   Robert O'Callahan <[e-mail]>
 *   David Baron <[e-mail]>
 *   Christian Biesinger <[e-mail]>
 *   Randall Jesup <[e-mail]>
 *   Roland Mainz <[e-mail]>
 *   Josh Soref <[e-mail]>
 *   Boris Zbarsky <[e-mail]>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Alternatively, the contents of this file may be used under the terms
 * of either the Mozilla Public License Version 1.1, found at
 * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
 * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
 * (the "GPL"), in which case the provisions of the MPL or the GPL are
 * applicable instead of those above.  If you wish to allow use of your
 * version of this file only under the terms of one of those two
 * licenses (the MPL or the GPL) and not to allow others to use your
 * version of this file under the LGPL, indicate your decision by
 * deletingthe provisions above and replace them with the notice and
 * other provisions required by the MPL or the GPL, as the case may be.
 * If you do not delete the provisions above, a recipient may use your
 * version of this file under any of the LGPL, the MPL or the GPL.
 */

#ifndef render_layer_h
#define render_layer_h

#include <qcolor.h>
#include <qrect.h>
#include <assert.h>

#include "render_object.h"

class QScrollBar;
template <class T> class QPtrVector;

namespace khtml {
    class RenderStyle;
    class RenderTable;
    class CachedObject;
    class RenderCanvas;
    class RenderText;
    class RenderFrameSet;
    class RenderObject;
    class RenderScrollMediator;
    
#ifdef NOKIA_CHANGES
class LayerInfo
OOM_MODIFIED
    {
public:
    int zIndex;
    BoxInfo* focusCandidate;
    QPoint dotPosition;
    int weightedDistance;
    QRect focusCandidateRect;
    QPtrList<BoxInfo> *boxInfoList;
    ~LayerInfo(){
        if(boxInfoList){
           boxInfoList->clear();
        }
        delete boxInfoList;
        boxInfoList = 0;
     }

    };
#endif

class RenderScrollMediator: public QObject
{
public:
    RenderScrollMediator(RenderLayer* layer)
    :m_layer(layer) {}

    void slotValueChanged(int);
    
private:
    RenderLayer* m_layer;
};

class ClipRects
{
public:
    ClipRects(const QRect& r) :m_overflowClipRect(r), m_fixedClipRect(r), m_posClipRect(r), m_refCnt(0) {}
    ClipRects(const QRect& o, const QRect& f, const QRect& p)
      :m_overflowClipRect(o), m_fixedClipRect(f), m_posClipRect(p), m_refCnt(0) {}

    const QRect& overflowClipRect() { return m_overflowClipRect; }
    const QRect& fixedClipRect() { return m_fixedClipRect; }
    const QRect& posClipRect() { return m_posClipRect; }

    void ref() { m_refCnt++; }
    void deref(RenderArena* renderArena) { if (--m_refCnt == 0) detach(renderArena); }
    
    void detach(RenderArena* renderArena);

    // Overloaded new operator.
    void* operator new(size_t sz, RenderArena* renderArena) throw();    

    // Overridden to prevent the normal delete from being called.
    void operator delete(void* ptr, size_t sz);
        
private:
    // The normal operator new is disallowed on all render objects.
    void* operator new(size_t sz) throw();

private:
    QRect m_overflowClipRect;
    QRect m_fixedClipRect;
    QRect m_posClipRect;
    uint m_refCnt;
};

// This class handles the auto-scrolling of layers with overflow: marquee.
class Marquee: public QObject
{
    Q_OBJECT
    
public:
    Marquee(RenderLayer* l);

    void timerEvent(QTimerEvent*);

    int speed() const { return m_speed; }
    int marqueeSpeed() const;
    EMarqueeDirection direction() const;
    EMarqueeDirection reverseDirection() const { return static_cast<EMarqueeDirection>(-direction()); }
    bool isHorizontal() const;
    bool isUnfurlMarquee() const;
    int unfurlPos() const { return m_unfurlPos; }

    EWhiteSpace whiteSpace() { return m_whiteSpace; }
    
    int computePosition(EMarqueeDirection dir, bool stopAtClientEdge);

    void setEnd(int end) { m_end = end; }
    
    void start();
    void suspend();
    void stop();

    void updateMarqueeStyle();
    void updateMarqueePosition();

private:
    RenderLayer* m_layer;
    int m_currentLoop;
    int m_totalLoops;
    int m_timerId;
    int m_start;
    int m_end;
    int m_speed;
    int m_unfurlPos;
    bool m_reset: 1;
    bool m_suspended : 1;
    bool m_stopped : 1;
    EWhiteSpace m_whiteSpace : 2;
    EMarqueeDirection m_direction : 4;
};

class RenderLayer
{
public:
    enum ScrollBehavior {
        noScroll,
        alignCenter,
        alignTop,
        alignBottom, 
        alignLeft,
        alignRight,
        alignToClosestEdge
    };

    struct ScrollAlignment {
        ScrollBehavior m_rectVisible;
        ScrollBehavior m_rectHidden;
        ScrollBehavior m_rectPartial;
    };

    static const ScrollAlignment gAlignCenterIfNeeded;
    static const ScrollAlignment gAlignToEdgeIfNeeded;
    static const ScrollAlignment gAlignCenterAlways;
    static const ScrollAlignment gAlignTopAlways;
    static const ScrollAlignment gAlignBottomAlways;
    
    static ScrollBehavior getVisibleBehavior(const ScrollAlignment& s) { return s.m_rectVisible; }
    static ScrollBehavior getPartialBehavior(const ScrollAlignment& s) { return s.m_rectPartial; }
    static ScrollBehavior getHiddenBehavior(const ScrollAlignment& s) { return s.m_rectHidden; }
    
#ifdef APPLE_CHANGES
    static QScrollBar* gScrollBar;
#endif
    
    RenderLayer(RenderObject* object);
    ~RenderLayer();
    
    RenderObject* renderer() const { return m_object; }
    RenderLayer *parent() const { return m_parent; }
    RenderLayer *previousSibling() const { return m_previous; }