render_style.cpp

khtml在gtk上的移植版本

/*
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 1999 Antti Koivisto ([e-mail])
 * Copyright (C) 2003 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.
 *
 */

#include "xml/dom_stringimpl.h"

#include "render_style.h"
#include "css/cssstyleselector.h"
#include "render_arena.h"

#include "kdebug.h"

using namespace khtml;

using DOM::DOMStringImpl;
using DOM::DOMString;

StyleSurroundData::StyleSurroundData()
    : margin( Fixed ), padding( Variable )
{
}

StyleSurroundData::StyleSurroundData(const StyleSurroundData& o )
    : Shared<StyleSurroundData>(),
      offset( o.offset ), margin( o.margin ), padding( o.padding ),
      border( o.border )
{
}

bool StyleSurroundData::operator==(const StyleSurroundData& o) const
{
    return offset==o.offset && margin==o.margin &&
	padding==o.padding && border==o.border;
}

StyleBoxData::StyleBoxData()
    : z_index( 0 ), z_auto(true)
{
    // Initialize our min/max widths/heights.
    min_width = min_height = RenderStyle::initialMinSize();
    max_width = max_height = RenderStyle::initialMaxSize();
}

StyleBoxData::StyleBoxData(const StyleBoxData& o )
    : Shared<StyleBoxData>(),
      width( o.width ), height( o.height ),
      min_width( o.min_width ), max_width( o.max_width ),
      min_height ( o.min_height ), max_height( o.max_height ),
      z_index( o.z_index ), z_auto( o.z_auto )
{
}

bool StyleBoxData::operator==(const StyleBoxData& o) const
{
    return
	    width == o.width &&
	    height == o.height &&
	    min_width == o.min_width &&
	    max_width == o.max_width &&
	    min_height == o.min_height &&
	    max_height == o.max_height &&
	    z_index == o.z_index &&
        z_auto == o.z_auto;
}

StyleVisualData::StyleVisualData()
      : hasClip(false), 
      textDecoration(RenderStyle::initialTextDecoration()), 
      colspan( 1 ), counter_increment( 0 ), counter_reset( 0 ),
      palette( QApplication::palette() )
{
}

StyleVisualData::~StyleVisualData() {
}

StyleVisualData::StyleVisualData(const StyleVisualData& o )
    : Shared<StyleVisualData>(),
      clip( o.clip ), hasClip( o.hasClip ), textDecoration(o.textDecoration), colspan( o.colspan ),
      counter_increment( o.counter_increment ), counter_reset( o.counter_reset ),
      palette( o.palette )
{
}



StyleBackgroundData::StyleBackgroundData()
    : image( RenderStyle::initialBackgroundImage() )
{
}

StyleBackgroundData::StyleBackgroundData(const StyleBackgroundData& o )
    : Shared<StyleBackgroundData>(),
      color( o.color ), image( o.image ),
      x_position( o.x_position ), y_position( o.y_position ),
      outline( o.outline )
{
}

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

StyleMarqueeData::StyleMarqueeData()
{
    increment = RenderStyle::initialMarqueeIncrement();
    speed = RenderStyle::initialMarqueeSpeed();
    direction = RenderStyle::initialMarqueeDirection();
    behavior = RenderStyle::initialMarqueeBehavior();
    loops = RenderStyle::initialMarqueeLoopCount();
}

StyleMarqueeData::StyleMarqueeData(const StyleMarqueeData& o)
:Shared<StyleMarqueeData>(), increment(o.increment), speed(o.speed), loops(o.loops),
 behavior(o.behavior), direction(o.direction) 
{}

bool StyleMarqueeData::operator==(const StyleMarqueeData& o) const
{
    return (increment == o.increment && speed == o.speed && direction == o.direction &&
            behavior == o.behavior && loops == o.loops);
}

StyleFlexibleBoxData::StyleFlexibleBoxData()
: Shared<StyleFlexibleBoxData>()
{
    flex = RenderStyle::initialBoxFlex();
    flex_group = RenderStyle::initialBoxFlexGroup();
    ordinal_group = RenderStyle::initialBoxOrdinalGroup();
    align = RenderStyle::initialBoxAlign();
    pack = RenderStyle::initialBoxPack();
    orient = RenderStyle::initialBoxOrient();
    lines = RenderStyle::initialBoxLines();
}

StyleFlexibleBoxData::StyleFlexibleBoxData(const StyleFlexibleBoxData& o)
: Shared<StyleFlexibleBoxData>()
{
    flex = o.flex;
    flex_group = o.flex_group;
    ordinal_group = o.ordinal_group;
    align = o.align;
    pack = o.pack;
    orient = o.orient;
    lines = o.lines;
}

bool StyleFlexibleBoxData::operator==(const StyleFlexibleBoxData& o) const
{
    return flex == o.flex && flex_group == o.flex_group &&
           ordinal_group == o.ordinal_group && align == o.align &&
           pack == o.pack && orient == o.orient && lines == o.lines;
}

StyleCSS3NonInheritedData::StyleCSS3NonInheritedData()
:Shared<StyleCSS3NonInheritedData>(), 
#if APPLE_CHANGES
lineClamp(RenderStyle::initialLineClamp()),
#endif
opacity(RenderStyle::initialOpacity()),
userDrag(RenderStyle::initialUserDrag()),
userSelect(RenderStyle::initialUserSelect()),
textOverflow(RenderStyle::initialTextOverflow())
#ifndef KHTML_NO_XBL
, bindingURI(0)
#endif
{
}

StyleCSS3NonInheritedData::StyleCSS3NonInheritedData(const StyleCSS3NonInheritedData& o)
:Shared<StyleCSS3NonInheritedData>(), 
#if APPLE_CHANGES
lineClamp(o.lineClamp),
#endif
opacity(o.opacity), flexibleBox(o.flexibleBox), marquee(o.marquee),
userDrag(o.userDrag), userSelect(o.userSelect), textOverflow(o.textOverflow)
{
#ifndef KHTML_NO_XBL
    bindingURI = o.bindingURI ? o.bindingURI->copy() : 0;
#endif
}

StyleCSS3NonInheritedData::~StyleCSS3NonInheritedData()
{
#ifndef KHTML_NO_XBL
    delete bindingURI;
#endif
}

#ifndef KHTML_NO_XBL
bool StyleCSS3NonInheritedData::bindingsEquivalent(const StyleCSS3NonInheritedData& o) const
{
    if (this == &o) return true;
    if (!bindingURI && o.bindingURI || bindingURI && !o.bindingURI)
        return false;
    if (bindingURI && o.bindingURI && (*bindingURI != *o.bindingURI))
        return false;
    return true;
}
#endif

bool StyleCSS3NonInheritedData::operator==(const StyleCSS3NonInheritedData& o) const
{
    return opacity == o.opacity && flexibleBox == o.flexibleBox && marquee == o.marquee &&
           userDrag == o.userDrag && userSelect == o.userSelect && textOverflow == o.textOverflow
#ifndef KHTML_NO_XBL
           && bindingsEquivalent(o)
#endif
#if APPLE_CHANGES
           && lineClamp == o.lineClamp
#endif
    ;
}

StyleCSS3InheritedData::StyleCSS3InheritedData()
:Shared<StyleCSS3InheritedData>(), textShadow(0), userModify(READ_ONLY)
#if APPLE_CHANGES
, textSizeAdjust(RenderStyle::initialTextSizeAdjust())
#endif
{

}

StyleCSS3InheritedData::StyleCSS3InheritedData(const StyleCSS3InheritedData& o)
:Shared<StyleCSS3InheritedData>()
{
    textShadow = o.textShadow ? new ShadowData(*o.textShadow) : 0;
    userModify = o.userModify;
#if APPLE_CHANGES
    textSizeAdjust = o.textSizeAdjust;
#endif
}

StyleCSS3InheritedData::~StyleCSS3InheritedData()
{
    delete textShadow;
}

bool StyleCSS3InheritedData::operator==(const StyleCSS3InheritedData& o) const
{
    return (userModify == o.userModify) && shadowDataEquivalent(o)
#if APPLE_CHANGES
            && (textSizeAdjust == o.textSizeAdjust)
#endif
    ;
}

bool StyleCSS3InheritedData::shadowDataEquivalent(const StyleCSS3InheritedData& o) const
{
    if (!textShadow && o.textShadow || textShadow && !o.textShadow)
        return false;
    if (textShadow && o.textShadow && (*textShadow != *o.textShadow))
        return false;
    return true;
}

StyleInheritedData::StyleInheritedData()
    : indent( RenderStyle::initialTextIndent() ), line_height( RenderStyle::initialLineHeight() ), 
      style_image( RenderStyle::initialListStyleImage() ),
      cursor_image( 0 ), font(), color( RenderStyle::initialColor() ), 
      horizontal_border_spacing( RenderStyle::initialHorizontalBorderSpacing() ), 
      vertical_border_spacing( RenderStyle::initialVerticalBorderSpacing() ),
      widows( RenderStyle::initialWidows() ), orphans( RenderStyle::initialOrphans() ),
      page_break_inside( RenderStyle::initialPageBreak() )
{
}

StyleInheritedData::~StyleInheritedData()
{
}

StyleInheritedData::StyleInheritedData(const StyleInheritedData& o )
    : Shared<StyleInheritedData>(),
      indent( o.indent ), line_height( o.line_height ), style_image( o.style_image ),
      cursor_image( o.cursor_image ), font( o.font ),
      color( o.color ),
      horizontal_border_spacing( o.horizontal_border_spacing ),
      vertical_border_spacing( o.vertical_border_spacing ),
      widows(o.widows), orphans(o.orphans), page_break_inside(o.page_break_inside)
{
}

bool StyleInheritedData::operator==(const StyleInheritedData& o) const
{
    return
	indent == o.indent &&
	line_height == o.line_height &&
	style_image == o.style_image &&
	cursor_image == o.cursor_image &&
	font == o.font &&
	color == o.color &&
        horizontal_border_spacing == o.horizontal_border_spacing &&
        vertical_border_spacing == o.vertical_border_spacing &&
        widows == o.widows &&
        orphans == o.orphans &&
        page_break_inside == o.page_break_inside;
}

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

void* RenderStyle::operator new(size_t sz, RenderArena* renderArena) throw()
{
    return renderArena->allocate(sz);
}

void RenderStyle::operator delete(void* ptr, size_t sz)
{
    // Stash size where detach can find it.
    *(size_t *)ptr = sz;
}

void RenderStyle::arenaDelete(RenderArena *arena)
{
    RenderStyle *ps = pseudoStyle;
    RenderStyle *prev = 0;
    
    while (ps) {
        prev = ps;
        ps = ps->pseudoStyle;
	// to prevent a double deletion.
	// this works only because the styles below aren't really shared
	// Dirk said we need another construct as soon as these are shared
        prev->pseudoStyle = 0;
        prev->deref(arena);
    }
    delete content;
    
    delete this;
    
    // Recover the size left there for us by operator delete and free the memory.
    arena->free(*(size_t *)this, this);
}

RenderStyle::RenderStyle()
:m_pseudoState(PseudoUnknown), m_affectedByAttributeSelectors(false)
{
    m_ref = 0;
    
    if (!_default)
	_default = ::new RenderStyle(true);

    box = _default->box;
    visual = _default->visual;
    background = _default->background;
    surround = _default->surround;
    css3NonInheritedData = _default->css3NonInheritedData;
    css3InheritedData = _default->css3InheritedData;
    
    inherited = _default->inherited;

    setBitDefaults();

    pseudoStyle = 0;
    content = 0;
}

RenderStyle::RenderStyle(bool)
:m_pseudoState(PseudoUnknown), m_affectedByAttributeSelectors(false)
{
    setBitDefaults();

    box.init();
    visual.init();
    background.init();
    surround.init();
    css3NonInheritedData.init();
    css3NonInheritedData.access()->flexibleBox.init();
    css3NonInheritedData.access()->marquee.init();
    css3InheritedData.init();
    inherited.init();

    pseudoStyle = 0;
    content = 0;
    m_ref = 1;
}

RenderStyle::RenderStyle(const RenderStyle& o)
    : inherited_flags( o.inherited_flags ), noninherited_flags( o.noninherited_flags ),
      box( o.box ), visual( o.visual ), background( o.background ), surround( o.surround ),
      css3NonInheritedData( o.css3NonInheritedData ), css3InheritedData( o.css3InheritedData ),
      inherited( o.inherited ), pseudoStyle( 0 ), content( o.content ), m_pseudoState(o.m_pseudoState),
      m_affectedByAttributeSelectors(false)
{
    m_ref = 0;
}

void RenderStyle::inheritFrom(const RenderStyle* inheritParent)
{
    css3InheritedData = inheritParent->css3InheritedData;
    inherited = inheritParent->inherited;
    inherited_flags = inheritParent->inherited_flags;
}

RenderStyle::~RenderStyle()
{
}

bool RenderStyle::operator==(const RenderStyle& o) const
{
// compare everything except the pseudoStyle pointer
    return (inherited_flags == o.inherited_flags &&
            noninherited_flags == o.noninherited_flags &&
	    box == o.box &&
            visual == o.visual &&
            background == o.background &&
            surround == o.surround &&
            css3NonInheritedData == o.css3NonInheritedData &&
            css3InheritedData == o.css3InheritedData &&
            inherited == o.inherited);
}

bool RenderStyle::isStyleAvailable() const
{
    return this != CSSStyleSelector::styleNotYetAvailable;
}

enum EPseudoBit { NO_BIT = 0x0, BEFORE_BIT = 0x1, AFTER_BIT = 0x2, FIRST_LINE_BIT = 0x4,
                  FIRST_LETTER_BIT = 0x8, SELECTION_BIT = 0x10, FIRST_LINE_INHERITED_BIT = 0x20 };

static int pseudoBit(RenderStyle::PseudoId pseudo)
{
    switch (pseudo) {
        case RenderStyle::BEFORE:
            return BEFORE_BIT;