css_valueimpl.h

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/*
 * This file is part of the DOM implementation for KDE.
 *
 * (C) 1999-2003 Lars Knoll ([e-mail])
 * Copyright (C) 2004 Apple Computer, Inc.
 *
 * 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 _CSS_css_valueimpl_h_
#define _CSS_css_valueimpl_h_

#include "dom/css_value.h"
#include "css/css_base.h"
#include "misc/loader_client.h"
#include <qvaluelist.h>

namespace khtml {
    class RenderStyle;
    class CachedImage;
    class DocLoader;
}

namespace DOM {

class CSSMutableStyleDeclarationImpl;
class CounterImpl;

extern const int inheritableProperties[];
extern const unsigned numInheritableProperties;

class CSSStyleDeclarationImpl : public StyleBaseImpl
{
public:
    virtual bool isStyleDeclaration();

    CSSRuleImpl *parentRule() const;

    virtual DOMString cssText() const = 0;
    virtual void setCssText(const DOMString &, int &exceptionCode) = 0;

    virtual unsigned long length() const = 0;
    virtual DOMString item(unsigned long index) const = 0;

    virtual CSSValueImpl *getPropertyCSSValue(int propertyID) const = 0;
    virtual DOMString getPropertyValue(int propertyID) const = 0;
    virtual bool getPropertyPriority(int propertyID) const = 0;

    virtual void setProperty(int propertyId, const DOMString &value, bool important, int &exceptionCode) = 0;
    virtual DOMString removeProperty(int propertyID, int &exceptionCode) = 0;

    virtual CSSMutableStyleDeclarationImpl *copy() const = 0;
    virtual CSSMutableStyleDeclarationImpl *makeMutable() = 0;
 
    void diff(CSSMutableStyleDeclarationImpl *) const;

    CSSMutableStyleDeclarationImpl *copyPropertiesInSet(const int *set, unsigned length) const;

protected:
    CSSStyleDeclarationImpl(CSSRuleImpl *parentRule = 0);


private:
    CSSStyleDeclarationImpl(const CSSStyleDeclarationImpl &);
    CSSStyleDeclarationImpl& operator=(const CSSStyleDeclarationImpl &);
};

class CSSValueImpl : public StyleBaseImpl
{
public:
    virtual unsigned short cssValueType() const = 0;
    virtual DOMString cssText() const = 0;

    virtual bool isValue() { return true; }
    virtual bool isFontValue() { return false; }
};

class CSSInheritedValueImpl : public CSSValueImpl
{
public:
    virtual unsigned short cssValueType() const;
    virtual DOMString cssText() const;
};

class CSSInitialValueImpl : public CSSValueImpl
{
public:
    virtual unsigned short cssValueType() const;
    virtual DOMString cssText() const;
};

class CSSValueListImpl : public CSSValueImpl
{
public:
    CSSValueListImpl();

    virtual ~CSSValueListImpl();

    unsigned long length() const { return m_values.count(); }
    CSSValueImpl *item ( unsigned long index ) { return m_values.at(index); }

    virtual bool isValueList() { return true; }

    virtual unsigned short cssValueType() const;

    void append(CSSValueImpl *val);
    virtual DOMString cssText() const;

protected:
    QPtrList<CSSValueImpl> m_values;
};


class Counter;
class RGBColor;
class Rect;
class DashboardRegionImpl;

class CSSPrimitiveValueImpl : public CSSValueImpl
{
public:
    CSSPrimitiveValueImpl();
    CSSPrimitiveValueImpl(int ident);
    CSSPrimitiveValueImpl(double num, CSSPrimitiveValue::UnitTypes type);
    CSSPrimitiveValueImpl(const DOMString &str, CSSPrimitiveValue::UnitTypes type);
    CSSPrimitiveValueImpl(const Counter &c);
    CSSPrimitiveValueImpl(RectImpl *r);
    CSSPrimitiveValueImpl(DashboardRegionImpl *r);
    CSSPrimitiveValueImpl(QRgb color);

    virtual ~CSSPrimitiveValueImpl();

    void cleanup();

    unsigned short primitiveType() const {
	    return m_type;
    }

    /*
     * computes a length in pixels out of the given CSSValue. Need the RenderStyle to get
     * the fontinfo in case val is defined in em or ex.
     *
     * The metrics have to be a bit different for screen and printer output.
     * For screen output we assume 1 inch == 72 px, for printer we assume 300 dpi
     *
     * this is screen/printer dependent, so we probably need a config option for this,
     * and some tool to calibrate.
     */
    int computeLength( khtml::RenderStyle *style, QPaintDeviceMetrics *devMetrics );
    int computeLength( khtml::RenderStyle *style, QPaintDeviceMetrics *devMetrics, double multiplier );
    double computeLengthFloat( khtml::RenderStyle *style, QPaintDeviceMetrics *devMetrics,
                               bool applyZoomFactor = true );

    // use with care!!!
    void setPrimitiveType(unsigned short type) { m_type = type; }
    void setFloatValue ( unsigned short unitType, double floatValue, int &exceptioncode );
    double getFloatValue ( unsigned short/* unitType */) const {
	return m_value.num;
    }

    void setStringValue ( unsigned short stringType, const DOM::DOMString &stringValue, int &exceptioncode );
    DOM::DOMString getStringValue() const;
    
    CounterImpl *getCounterValue () const {
        return ( m_type != CSSPrimitiveValue::CSS_COUNTER ? 0 : m_value.counter );
    }

    RectImpl *getRectValue () const {
	return ( m_type != CSSPrimitiveValue::CSS_RECT ? 0 : m_value.rect );
    }

    QRgb getRGBColorValue () const {
	return ( m_type != CSSPrimitiveValue::CSS_RGBCOLOR ? 0 : m_value.rgbcolor );
    }

#if APPLE_CHANGES
    DashboardRegionImpl *getDashboardRegionValue () const {
	return ( m_type != CSSPrimitiveValue::CSS_DASHBOARD_REGION ? 0 : m_value.region );
    }
#endif

    virtual bool isPrimitiveValue() const { return true; }
    virtual unsigned short cssValueType() const;

    int getIdent();

    virtual bool parseString( const DOMString &string, bool = false);
    virtual DOMString cssText() const;

    virtual bool isQuirkValue() { return false; }

protected:
    int m_type;
    union {
	int ident;
	double num;
	DOMStringImpl *string;
	CounterImpl *counter;
	RectImpl *rect;
        QRgb rgbcolor;
        DashboardRegionImpl *region;
    } m_value;
};

// This value is used to handle quirky margins in reflow roots (body, td, and th) like WinIE.
// The basic idea is that a stylesheet can use the value __qem (for quirky em) instead of em
// in a stylesheet.  When the quirky value is used, if you're in quirks mode, the margin will
// collapse away inside a table cell.
class CSSQuirkPrimitiveValueImpl : public CSSPrimitiveValueImpl
{
public:
    CSSQuirkPrimitiveValueImpl(double num, CSSPrimitiveValue::UnitTypes type)
      :CSSPrimitiveValueImpl(num, type) {}

    virtual bool isQuirkValue() { return true; }
};

class CounterImpl : public khtml::Shared<CounterImpl> {
public:
    DOMString identifier() const { return m_identifier; }
    DOMString listStyle() const { return m_listStyle; }
    DOMString separator() const { return m_separator; }

    DOMString m_identifier;
    DOMString m_listStyle;
    DOMString m_separator;
};

class RectImpl : public khtml::Shared<RectImpl> {
public:
    RectImpl();
    virtual ~RectImpl();

    CSSPrimitiveValueImpl *top() { return m_top; }
    CSSPrimitiveValueImpl *right() { return m_right; }
    CSSPrimitiveValueImpl *bottom() { return m_bottom; }
    CSSPrimitiveValueImpl *left() { return m_left; }

    void setTop( CSSPrimitiveValueImpl *top );
    void setRight( CSSPrimitiveValueImpl *right );
    void setBottom( CSSPrimitiveValueImpl *bottom );
    void setLeft( CSSPrimitiveValueImpl *left );