render_style.cpp

khtml在gtk上的移植版本

        case RenderStyle::AFTER:
            return AFTER_BIT;
        case RenderStyle::FIRST_LINE:
            return FIRST_LINE_BIT;
        case RenderStyle::FIRST_LETTER:
            return FIRST_LETTER_BIT;
        case RenderStyle::SELECTION:
            return SELECTION_BIT;
        case RenderStyle::FIRST_LINE_INHERITED:
            return FIRST_LINE_INHERITED_BIT;
        default:
            return NO_BIT;
    }
}

bool RenderStyle::hasPseudoStyle(PseudoId pseudo) const
{
    return (pseudoBit(pseudo) & noninherited_flags._pseudoBits) != 0;
}

void RenderStyle::setHasPseudoStyle(PseudoId pseudo)
{
    noninherited_flags._pseudoBits |= pseudoBit(pseudo);
}

RenderStyle* RenderStyle::getPseudoStyle(PseudoId pid)
{
    RenderStyle *ps = 0;
    if (noninherited_flags._styleType==NOPSEUDO) {
	ps = pseudoStyle;
        while (ps) {
            if (ps->noninherited_flags._styleType==pid)
                    break;
    
            ps = ps->pseudoStyle;
        }
    }
    return ps;
}

void RenderStyle::addPseudoStyle(RenderStyle* pseudo)
{
    if (!pseudo) return;
    
    pseudo->ref();
    pseudo->pseudoStyle = pseudoStyle;
    pseudoStyle = pseudo;
}

bool RenderStyle::inheritedNotEqual( RenderStyle *other ) const
{
    return inherited_flags != other->inherited_flags ||
           inherited != other->inherited ||
           css3InheritedData != other->css3InheritedData;
}

/*
  compares two styles. The result gives an idea of the action that
  needs to be taken when replacing the old style with a new one.

  CbLayout: The containing block of the object needs a relayout.
  Layout: the RenderObject needs a relayout after the style change
  Visible: The change is visible, but no relayout is needed
  NonVisible: The object does need neither repaint nor relayout after
       the change.

  ### TODO:
  A lot can be optimised here based on the display type, lots of
  optimisations are unimplemented, and currently result in the
  worst case result causing a relayout of the containing block.
*/
RenderStyle::Diff RenderStyle::diff( const RenderStyle *other ) const
{
    // we anyway assume they are the same
// 	EDisplay _effectiveDisplay : 5;

    // NonVisible:
// 	ECursor _cursor_style : 4;

// ### this needs work to know more exactly if we need a relayout
//     or just a repaint

// non-inherited attributes
//     DataRef<StyleBoxData> box;
//     DataRef<StyleVisualData> visual;
//     DataRef<StyleSurroundData> surround;

// inherited attributes
//     DataRef<StyleInheritedData> inherited;

    if ( *box.get() != *other->box.get() ||
         !(surround->margin == other->surround->margin) ||
         !(surround->padding == other->surround->padding) ||
         *css3NonInheritedData->flexibleBox.get() != *other->css3NonInheritedData->flexibleBox.get() ||
#if APPLE_CHANGES
         (css3NonInheritedData->lineClamp != other->css3NonInheritedData->lineClamp) ||
         (css3InheritedData->textSizeAdjust != other->css3InheritedData->textSizeAdjust) ||
#endif
        !(inherited->indent == other->inherited->indent) ||
        !(inherited->line_height == other->inherited->line_height) ||
        !(inherited->style_image == other->inherited->style_image) ||
        !(inherited->cursor_image == other->inherited->cursor_image) ||
        !(inherited->font == other->inherited->font) ||
        !(inherited->horizontal_border_spacing == other->inherited->horizontal_border_spacing) ||
        !(inherited->vertical_border_spacing == other->inherited->vertical_border_spacing) ||
        !(inherited_flags._box_direction == other->inherited_flags._box_direction) ||
        !(inherited_flags._visuallyOrdered == other->inherited_flags._visuallyOrdered) ||
        !(inherited_flags._htmlHacks == other->inherited_flags._htmlHacks) ||
        !(noninherited_flags._position == other->noninherited_flags._position) ||
        !(noninherited_flags._floating == other->noninherited_flags._floating) ||
        !(noninherited_flags._originalDisplay == other->noninherited_flags._originalDisplay) ||
         visual->colspan != other->visual->colspan ||
         visual->counter_increment != other->visual->counter_increment ||
         visual->counter_reset != other->visual->counter_reset ||
         css3NonInheritedData->textOverflow != other->css3NonInheritedData->textOverflow)
        return CbLayout;
   
    // changes causing Layout changes:

// only for tables:
// 	_border_collapse
// 	EEmptyCell _empty_cells : 2 ;
// 	ECaptionSide _caption_side : 2;
//     ETableLayout _table_layout : 1;
//     EPosition _position : 2;
//     EFloat _floating : 2;
    if ( ((int)noninherited_flags._effectiveDisplay) >= TABLE ) {
	// Stupid gcc gives a compile error on
	// a != other->b if a and b are bitflags. Using
	// !(a== other->b) instead.
	if ( !(inherited_flags._border_collapse == other->inherited_flags._border_collapse) ||
	     !(inherited_flags._empty_cells == other->inherited_flags._empty_cells) ||
	     !(inherited_flags._caption_side == other->inherited_flags._caption_side) ||
	     !(noninherited_flags._table_layout == other->noninherited_flags._table_layout))
        return CbLayout;
    }

// only for lists:
// 	EListStyleType _list_style_type : 5 ;
// 	EListStylePosition _list_style_position :1;
    if (noninherited_flags._effectiveDisplay == LIST_ITEM ) {
	if ( !(inherited_flags._list_style_type == other->inherited_flags._list_style_type) ||
	     !(inherited_flags._list_style_position == other->inherited_flags._list_style_position) )
	    return Layout;
    }

// ### These could be better optimised
// 	ETextAlign _text_align : 3;
// 	ETextTransform _text_transform : 4;
// 	EDirection _direction : 1;
// 	EWhiteSpace _white_space : 2;
// 	EFontVariant _font_variant : 1;
//     EClear _clear : 2;
    if ( !(inherited_flags._text_align == other->inherited_flags._text_align) ||
	 !(inherited_flags._text_transform == other->inherited_flags._text_transform) ||
	 !(inherited_flags._direction == other->inherited_flags._direction) ||
	 !(inherited_flags._white_space == other->inherited_flags._white_space) ||
	 !(noninherited_flags._clear == other->noninherited_flags._clear)
	)
	return Layout;

// only for inline:
//     EVerticalAlign _vertical_align : 4;

    if ( !(noninherited_flags._effectiveDisplay == INLINE) &&
         !(noninherited_flags._vertical_align == other->noninherited_flags._vertical_align))
        return Layout;

    // If our border widths change, then we need to layout.  Other changes to borders
    // only necessitate a repaint.
    if (borderLeftWidth() != other->borderLeftWidth() ||
        borderTopWidth() != other->borderTopWidth() ||
        borderBottomWidth() != other->borderBottomWidth() ||
        borderRightWidth() != other->borderRightWidth())
        return Layout;

    // Make sure these left/top/right/bottom checks stay below all layout checks and above
    // all visible checks.
    if (other->position() != STATIC && !(surround->offset == other->surround->offset)) {
     // FIXME: would like to do this at some point, but will need a new hint that indicates
     // descendants need to be repainted too.
     //   if (other->position() == RELATIVE)
     //       return Visible;
     //   else
            return Layout;
    }

    // Visible:
// 	EVisibility _visibility : 2;
//     EOverflow _overflow : 4 ;
//     EBackgroundRepeat _bg_repeat : 2;
//     bool _bg_attachment : 1;
// 	int _text_decoration : 4;
//     DataRef<StyleBackgroundData> background;
    if (inherited->color != other->inherited->color ||
        !(inherited_flags._visibility == other->inherited_flags._visibility) ||
        !(noninherited_flags._overflow == other->noninherited_flags._overflow) ||
        !(noninherited_flags._bg_repeat == other->noninherited_flags._bg_repeat) ||
        !(noninherited_flags._bg_attachment == other->noninherited_flags._bg_attachment) ||
        !(inherited_flags._text_decorations == other->inherited_flags._text_decorations) ||
        !(inherited_flags._should_correct_text_color == other->inherited_flags._should_correct_text_color) ||
        !(surround->border == other->surround->border) ||
        *background.get() != *other->background.get() ||
        !(visual->clip == other->visual->clip) ||
        visual->hasClip != other->visual->hasClip ||
        visual->textDecoration != other->visual->textDecoration ||
        css3NonInheritedData->opacity != other->css3NonInheritedData->opacity ||
        !css3InheritedData->shadowDataEquivalent(*other->css3InheritedData.get()) ||
        css3InheritedData->userModify != other->css3InheritedData->userModify ||
        css3NonInheritedData->userSelect != other->css3NonInheritedData->userSelect ||
        css3NonInheritedData->userDrag != other->css3NonInheritedData->userDrag ||
        !(visual->palette == other->visual->palette)
	)
        return Visible;

    return Equal;
}


RenderStyle* RenderStyle::_default = 0;
//int RenderStyle::counter = 0;
//int SharedData::counter = 0;

void RenderStyle::cleanup()
{
    delete _default;
    _default = 0;
//    counter = 0;
//    SharedData::counter = 0;
}

void RenderStyle::setPaletteColor(QPalette::ColorGroup g, QColorGroup::ColorRole r, const QColor& c)
{
    visual.access()->palette.setColor(g,r,c);
}

void RenderStyle::setClip( Length top, Length right, Length bottom, Length left )
{
    StyleVisualData *data = visual.access();
    data->clip.top = top;
    data->clip.right = right;
    data->clip.bottom = bottom;
    data->clip.left = left;
}

bool RenderStyle::contentDataEquivalent(RenderStyle* otherStyle)
{
    ContentData* c1 = content;
    ContentData* c2 = otherStyle->content;

    while (c1 && c2) {
        if (c1->_contentType != c2->_contentType)
            return false;
        if (c1->_contentType == CONTENT_TEXT) {
            DOMString c1Str(c1->_content.text);
            DOMString c2Str(c2->_content.text);
            if (c1Str != c2Str)
                return false;
        }
        else if (c1->_contentType == CONTENT_OBJECT) {
            if (c1->_content.object != c2->_content.object)
                return false;
        }

        c1 = c1->_nextContent;
        c2 = c2->_nextContent;
    }

    return !c1 && !c2;
}

void RenderStyle::setContent(CachedObject* o, bool add)
{
    if (!o)
        return; // The object is null. Nothing to do. Just bail.

    ContentData* lastContent = content;
    while (lastContent && lastContent->_nextContent)
        lastContent = lastContent->_nextContent;

    bool reuseContent = !add;
    ContentData* newContentData = 0;
    if (reuseContent && content) {
        content->clearContent();
        newContentData = content;
    }
    else
        newContentData = new ContentData;

    if (lastContent && !reuseContent)
        lastContent->_nextContent = newContentData;
    else
        content = newContentData;

    //    o->ref();
    newContentData->_content.object = o;
    newContentData->_contentType = CONTENT_OBJECT;
}

void RenderStyle::setContent(DOMStringImpl* s, bool add)
{
    if (!s)
        return; // The string is null. Nothing to do. Just bail.
    
    ContentData* lastContent = content;
    while (lastContent && lastContent->_nextContent)
        lastContent = lastContent->_nextContent;

    bool reuseContent = !add;
    if (add) {
        if (!lastContent)
            return; // Something's wrong.  We had no previous content, and we should have.

        if (lastContent->_contentType == CONTENT_TEXT) {
            // We can augment the existing string and share this ContentData node.
            DOMStringImpl* oldStr = lastContent->_content.text;
            DOMStringImpl* newStr = oldStr->copy();
            newStr->ref();
            oldStr->deref();
            newStr->append(s);
            lastContent->_content.text = newStr;
            return;
        }
    }

    ContentData* newContentData = 0;
    if (reuseContent && content) {
        content->clearContent();
        newContentData = content;
    }
    else
        newContentData = new ContentData;
    
    if (lastContent && !reuseContent)
        lastContent->_nextContent = newContentData;
    else
        content = newContentData;
    
    newContentData->_content.text = s;
    newContentData->_content.text->ref();
    newContentData->_contentType = CONTENT_TEXT;
}

ContentData::~ContentData()
{
    clearContent();
}

void ContentData::clearContent()
{
    delete _nextContent;
    _nextContent = 0;
    
    switch (_contentType)
    {
        case CONTENT_OBJECT:
//            _content.object->deref();
            _content.object = 0;
            break;
        case CONTENT_TEXT:
            _content.text->deref();
            _content.text = 0;
        default:
            ;
    }
}

#ifndef KHTML_NO_XBL
BindingURI::BindingURI(DOM::DOMStringImpl* uri) 
:m_next(0)
{ 
    m_uri = uri;
    if (uri) uri->ref();
}

BindingURI::~BindingURI()
{
    if (m_uri)
        m_uri->deref();
    delete m_next;
}

BindingURI* BindingURI::copy()
{
    BindingURI* newBinding = new BindingURI(m_uri);
    if (next()) {
        BindingURI* nextCopy = next()->copy();
        newBinding->setNext(nextCopy);
    }
    
    return newBinding;
}

bool BindingURI::operator==(const BindingURI& o) const
{
    if ((m_next && !o.m_next) || (!m_next && o.m_next) ||
        (m_next && o.m_next && *m_next != *o.m_next))
        return false;
    
    if (m_uri == o.m_uri)
        return true;
    if (!m_uri || !o.m_uri)
        return false;
    
    return DOMString(m_uri) == DOMString(o.m_uri);
}

void RenderStyle::addBindingURI(DOM::DOMStringImpl* uri)
{
    BindingURI* binding = new BindingURI(uri);
    if (!bindingURIs())
        SET_VAR(css3NonInheritedData, bindingURI, binding)
    else 
        for (BindingURI* b = bindingURIs(); b; b = b->next()) {
            if (!b->next())
                b->setNext(binding);
        }
}
#endif

void RenderStyle::setTextShadow(ShadowData* val, bool add)
{
    StyleCSS3InheritedData* css3Data = css3InheritedData.access(); 
    if (!add) {
        delete css3Data->textShadow;
        css3Data->textShadow = val;
        return;
    }

    ShadowData* last = css3Data->textShadow;
    while (last->next) last = last->next;
    last->next = val;
}

ShadowData::ShadowData(const ShadowData& o)
:x(o.x), y(o.y), blur(o.blur), color(o.color)
{
    next = o.next ? new ShadowData(*o.next) : 0;
}

bool ShadowData::operator==(const ShadowData& o) const
{
    if ((next && !o.next) || (!next && o.next) ||
        (next && o.next && *next != *o.next))
        return false;
    
    return x == o.x && y == o.y && blur == o.blur && color == o.color;
}