render_style.h

monqueror一个很具有参考价值的源玛

/*
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 1999 Antti Koivisto ([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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * $Id: render_style.h,v 1.1.1.1 2002/01/16 10:39:56 ymwei Exp $
 */
#ifndef RENDERSTYLE_H
#define RENDERSTYLE_H

#include "render_interface.h"
#include "mgcolor.h"
#include "mgfont.h"
#include "khtmllayout.h"

#define SET_VAR(group,variable,value) \
    if (group->variable != value) \
        group.access()->variable = value;

namespace khtml {

    class MGCachedImage;

template <class DATA>
class DataRef
{
public:

    DataRef()
    {
	data=0;
    }

    virtual ~DataRef()
    {
    	if(data) data->deref();
    }

    const DATA* operator->() const
    {    	
    	return data;
    }
    
    const DATA* get() const
    {    	
    	return data;
    }


    DATA* access()
    {    	
    	if (!data->hasOneRef())
	{
	    data->deref();
	    data = new DATA(*data);
	    data->ref();
	}
	return data;
    }

    void init()
    {
    	if (data)
    	    data->deref();
    	data = new DATA;
	data->ref();
    }

    DataRef<DATA>& operator=(const DataRef<DATA>& d)
    {
    	if (data==d.data)
	    return *this;
    	if (data)
    	    data->deref();
    	data = d.data;

	data->ref();
	
	return *this;
    }

private:
    DATA* data;
};


class SharedData
{
public:
    SharedData() { _ref=0; counter++; }
    virtual ~SharedData() { counter--; }

    void ref() { _ref++;  }
    void deref() { if(_ref) _ref--; if(_ref<=0) delete this; }
    bool hasOneRef() { //kdDebug(300) << "ref=" << _ref << endl;
    	return _ref==1; }

    static int counter;
protected:
    unsigned int _ref;
};


//------------------------------------------------

//------------------------------------------------
// Box model attributes. Not inherited.

struct LengthBox
{
    LengthBox()
    {
    }

    Length left;
    Length right;
    Length top;
    Length bottom;
    Length& operator=(Length& len)
    {
    	left=len;
	right=len;
	top=len;
	bottom=len;
	return len;
    }

    bool operator==(const LengthBox& o) const
    {
    	return left==o.left && right==o.right && top==o.top && bottom==o.bottom;
    }


    bool nonZero() const { return left.value!=0 || right.value!=0 || top.value!=0 || bottom.value!=0; }
};



enum EPosition {
    STATIC, RELATIVE, ABSOLUTE, FIXED
};

enum EFloat {
    FNONE, FLEFT, FRIGHT
};


//------------------------------------------------
// Border attributes. Not inherited.


enum EBorderStyle {
    BNONE, BHIDDEN, DOTTED, DASHED, SOLID, DOUBLE,
    GROOVE, RIDGE, INSET, OUTSET
};


class BorderValue
{
public:
    BorderValue()
    {
	width = 3; // medium is default value
	style = BNONE;
    }
    unsigned short width;
    MGColor color;
    EBorderStyle style : 4;

    bool nonZero() const { return width!=0 && style!=BNONE; }

    bool operator==(const BorderValue& o) const
    {
    	return width==o.width && style==o.style && color==o.color;
    }

};

class BorderData : public SharedData
{
public:
    BorderValue left;
    BorderValue right;
    BorderValue top;
    BorderValue bottom;

    bool hasBorder() const
    {
    	return left.nonZero() || right.nonZero() || top.nonZero() || bottom.nonZero();	
    }

    bool operator==(const BorderData& o) const
    {
    	return left==o.left && right==o.right && top==o.top && bottom==o.bottom;
    }

};

class StyleSurroundData : public SharedData
{
public:
    StyleSurroundData();

    virtual ~StyleSurroundData()
    {
    }

    StyleSurroundData(const StyleSurroundData& o );
    bool operator==(const StyleSurroundData& o) const;

    LengthBox offset;
    LengthBox margin;
    LengthBox padding;
    BorderData border;

};


//------------------------------------------------
// Box attributes. Not inherited.


const int ZAUTO=0;

class StyleBoxData : public SharedData
{
public:
    StyleBoxData();

    StyleBoxData(const StyleBoxData& o );


    // copy and assignment
//    StyleBoxData(const StyleBoxData &other);
//    const StyleBoxData &operator = (const StyleBoxData &other);

    void setDefaultValues()
    {
    	z_index = ZAUTO;
    }

    bool operator==(const StyleBoxData& o) const;

    Length width;
    Length height;

    Length min_width;
    Length max_width;

    Length min_height;
    Length max_height;

    int z_index;
};


//------------------------------------------------
// Random visual rendering model attributes. Not inherited.

enum EOverflow {
    OVISIBLE, OHIDDEN, SCROLL, AUTO
};

enum EVerticalAlign {
    BASELINE, SUB, SUPER, TOP, TEXT_TOP, MIDDLE,
    BOTTOM, TEXT_BOTTOM
};

enum EClear{
    CNONE = 0, CLEFT = 1, CRIGHT = 2, CBOTH = 3
};

enum ETableLayout {
    TAUTO, TFIXED
};

class StyleVisualData : public SharedData
{
public:
    StyleVisualData()
    {
	colspan = 1;
    }

    virtual ~StyleVisualData() {
    }

    StyleVisualData(const StyleVisualData& o ) : SharedData()
    {
    	clip = o.clip;
	colspan = o.colspan;
	counter_increment = o.counter_increment;
	counter_reset = o.counter_reset;
    }

    bool operator==(const StyleVisualData& o) const
    {
    	return
	    clip == o.clip &&
	    colspan == o.colspan &&
	    counter_increment == o.counter_increment &&
	    counter_reset == o.counter_reset;
    }

    LengthBox clip;

    short colspan; // for html, not a css2 attribute

    short counter_increment; //ok, so these are not visual mode spesific
    short counter_reset;     //can't go to inherited, since these are not inherited

};

//------------------------------------------------
enum EBackgroundRepeat {
    REPEAT, REPEAT_X, REPEAT_Y, NO_REPEAT
};



class StyleBackgroundData : public SharedData
{
public:
    StyleBackgroundData()
    {
	image = 0;
    }

    virtual ~StyleBackgroundData()
    {
    }

    StyleBackgroundData(const StyleBackgroundData& o ) : SharedData()
    {
    	color = o.color;
	image = o.image;
	x_position = o.x_position;
	y_position = o.y_position;
    }

    bool operator==(const StyleBackgroundData& o) const
    {
    	return
	    color == o.color &&
	    image == o.image &&
	    x_position == o.x_position &&
	    y_position == o.y_position;
    }

    MGColor color;
    MGCachedImage *image;

    Length x_position;
    Length y_position;
};

//------------------------------------------------
// Inherited attributes.
//
// the inherited-decoration and inherited-shadow attributes
// are inherited from the
// first parent which is block level
//
// this applies to decoration_color too

enum EWhiteSpace {
    NORMAL, PRE, NOWRAP
};

enum ETextAlign{
    LEFT, RIGHT, CENTER, JUSTIFY, KONQ_CENTER
};

enum EDirection{
    LTR, RTL
};