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tdelibs/tdehtml/rendering/render_container.cpp

598 lines
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/**
* This file is part of the html renderer for KDE.
*
* Copyright (C) 2001-2003 Lars Knoll (knoll@kde.org)
* (C) 2001 Antti Koivisto (koivisto@kde.org)
* (C) 2000-2003 Dirk Mueller (mueller@kde.org)
* (C) 2002-2003 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
//#define DEBUG_LAYOUT
#include "rendering/render_container.h"
#include "rendering/render_table.h"
#include "rendering/render_text.h"
#include "rendering/render_image.h"
#include "rendering/render_canvas.h"
#include "rendering/render_generated.h"
#include "rendering/render_inline.h"
#include "xml/dom_docimpl.h"
#include "css/css_valueimpl.h"
#include <kdebug.h>
#include <assert.h>
using namespace tdehtml;
RenderContainer::RenderContainer(DOM::NodeImpl* node)
: RenderObject(node)
{
m_first = 0;
m_last = 0;
}
void RenderContainer::detach()
{
if (continuation())
continuation()->detach();
// We simulate removeNode calls for all our children
// and set parent to 0 to avoid removeNode from being called.
// First call removeLayers and removeFromObjectLists since they assume
// a valid render-tree
for(RenderObject* n = m_first; n; n = n->nextSibling() ) {
n->removeLayers(enclosingLayer());
n->removeFromObjectLists();
}
RenderObject* next;
for(RenderObject* n = m_first; n; n = next ) {
n->setParent(0);
next = n->nextSibling();
n->detach();
}
m_first = 0;
m_last = 0;
RenderObject::detach();
}
void RenderContainer::addChild(RenderObject *newChild, RenderObject *beforeChild)
{
#ifdef DEBUG_LAYOUT
kdDebug( 6040 ) << this << ": " << renderName() << "(RenderObject)::addChild( " << newChild << ": " <<
newChild->renderName() << ", " << (beforeChild ? beforeChild->renderName() : "0") << " )" << endl;
#endif
// protect ourselves from deletion
setDoNotDelete(true);
bool needsTable = false;
if(!newChild->isText() && !newChild->isReplaced()) {
switch(newChild->style()->display()) {
case INLINE:
case BLOCK:
case LIST_ITEM:
case RUN_IN:
case COMPACT:
case INLINE_BLOCK:
case TABLE:
case INLINE_TABLE:
break;
case TABLE_COLUMN:
if ( isTableCol() )
break;
// nobreak
case TABLE_COLUMN_GROUP:
case TABLE_CAPTION:
case TABLE_ROW_GROUP:
case TABLE_HEADER_GROUP:
case TABLE_FOOTER_GROUP:
//kdDebug( 6040 ) << "adding section" << endl;
if ( !isTable() )
needsTable = true;
break;
case TABLE_ROW:
//kdDebug( 6040 ) << "adding row" << endl;
if ( !isTableSection() )
needsTable = true;
break;
case TABLE_CELL:
//kdDebug( 6040 ) << "adding cell" << endl;
if ( !isTableRow() )
needsTable = true;
// I'm not 100% sure this is the best way to fix this, but without this
// change we recurse infinitely when trying to render the CSS2 test page:
// http://www.bath.ac.uk/%7Epy8ieh/internet/eviltests/htmlbodyheadrendering2.html.
if ( isTableCell() && !firstChild() && !newChild->isTableCell() )
needsTable = false;
break;
case NONE:
// RenderHtml and some others can have display:none
// KHTMLAssert(false);
break;
}
}
if ( needsTable ) {
RenderTable *table;
RenderObject *last = beforeChild ? beforeChild->previousSibling() : lastChild();
if ( last && last->isTable() && last->isAnonymous() ) {
table = static_cast<RenderTable *>(last);
} else {
//kdDebug( 6040 ) << "creating anonymous table, before=" << beforeChild << endl;
table = new (renderArena()) RenderTable(document() /* is anonymous */);
RenderStyle *newStyle = new RenderStyle();
newStyle->inheritFrom(style());
newStyle->setDisplay( TABLE );
newStyle->setFlowAroundFloats( true );
table->setParent( this ); // so it finds the arena
table->setStyle(newStyle);
table->setParent( 0 );
addChild(table, beforeChild);
}
table->addChild(newChild);
} else {
// just add it...
insertChildNode(newChild, beforeChild);
}
if (newChild->isText() && newChild->style()->textTransform() == CAPITALIZE) {
DOM::DOMStringImpl* textToTransform = static_cast<RenderText*>(newChild)->originalString();
if (textToTransform)
static_cast<RenderText*>(newChild)->setText(textToTransform, true);
}
newChild->attach();
setDoNotDelete(false);
}
RenderObject* RenderContainer::removeChildNode(RenderObject* oldChild)
{
KHTMLAssert(oldChild->parent() == this);
// So that we'll get the appropriate dirty bit set (either that a normal flow child got yanked or
// that a positioned child got yanked). We also repaint, so that the area exposed when the child
// disappears gets repainted properly.
if ( document()->renderer() ) {
oldChild->setNeedsLayoutAndMinMaxRecalc();
oldChild->repaint();
// Keep our layer hierarchy updated.
oldChild->removeLayers(enclosingLayer());
// remove the child from any special layout lists
oldChild->removeFromObjectLists();
// if oldChild is the start or end of the selection, then clear
// the selection to avoid problems of invalid pointers
// ### This is not the "proper" solution... ideally the selection
// ### should be maintained based on DOM Nodes and a Range, which
// ### gets adjusted appropriately when nodes are deleted/inserted
// ### near etc. But this at least prevents crashes caused when
// ### the start or end of the selection is deleted and then
// ### accessed when the user next selects something.
if (oldChild->isSelectionBorder()) {
RenderObject *root = oldChild;
while (root->parent())
root = root->parent();
if (root->isCanvas()) {
static_cast<RenderCanvas*>(root)->clearSelection();
}
}
}
// remove the child from the render-tree
if (oldChild->previousSibling())
oldChild->previousSibling()->setNextSibling(oldChild->nextSibling());
if (oldChild->nextSibling())
oldChild->nextSibling()->setPreviousSibling(oldChild->previousSibling());
if (m_first == oldChild)
m_first = oldChild->nextSibling();
if (m_last == oldChild)
m_last = oldChild->previousSibling();
oldChild->setPreviousSibling(0);
oldChild->setNextSibling(0);
oldChild->setParent(0);
return oldChild;
}
void RenderContainer::setStyle(RenderStyle* _style)
{
RenderObject::setStyle(_style);
// If we are a pseudo-container we need to restyle the children
if (style()->isGenerated())
{
// ### we could save this call when the change only affected
// non inherited properties
RenderStyle *pseudoStyle = new RenderStyle();
pseudoStyle->inheritFrom(style());
pseudoStyle->ref();
RenderObject *child = firstChild();
while (child != 0)
{
child->setStyle(pseudoStyle);
child = child->nextSibling();
}
pseudoStyle->deref();
}
}
void RenderContainer::updatePseudoChildren()
{
// In CSS2, before/after pseudo-content cannot nest. Check this first.
// Remove when CSS 3 Generated Content becomes Candidate Recommendation
if (style()->styleType() == RenderStyle::BEFORE
|| style()->styleType() == RenderStyle::AFTER)
return;
updatePseudoChild(RenderStyle::BEFORE);
updatePseudoChild(RenderStyle::AFTER);
// updatePseudoChild(RenderStyle::MARKER, marker());
}
void RenderContainer::updatePseudoChild(RenderStyle::PseudoId type)
{
// The head manages generated content for its continuations
if (isInlineContinuation()) return;
RenderStyle* pseudo = style()->getPseudoStyle(type);
RenderObject* child = pseudoContainer(type);
// Whether or not we currently have generated content attached.
bool oldContentPresent = child && (child->style()->styleType() == type);
// Whether or not we now want generated content.
bool newContentWanted = pseudo && pseudo->display() != NONE;
// No generated content
if (!oldContentPresent && !newContentWanted)
return;
bool movedContent = (type == RenderStyle::AFTER && isRenderInline() && continuation());
// Whether or not we want the same old content.
bool sameOldContent = oldContentPresent && newContentWanted && !movedContent
&& (child->style()->contentDataEquivalent(pseudo));
// No change in content, update style
if( sameOldContent ) {
child->setStyle(pseudo);
return;
}
// If we don't want generated content any longer, or if we have generated content,
// but it's no longer identical to the new content data we want to build
// render objects for, then we nuke all of the old generated content.
if (oldContentPresent && (!newContentWanted || !sameOldContent))
{
// The child needs to be removed.
oldContentPresent = false;
child->detach();
child = 0;
}
// If we have no pseudo-style or if the pseudo's display type is NONE, then we
// have no generated content and can now return.
if (!newContentWanted)
return;
// Generated content consists of a single container that houses multiple children (specified
// by the content property). This pseudo container gets the pseudo style set on it.
RenderContainer* pseudoContainer = 0;
pseudoContainer = RenderFlow::createFlow(element(), pseudo, renderArena());
pseudoContainer->setIsAnonymous( true );
pseudoContainer->createGeneratedContent();
// Only add the container if it had content
if (pseudoContainer->firstChild()) {
addPseudoContainer(pseudoContainer);
pseudoContainer->close();
}
}
void RenderContainer::createGeneratedContent()
{
RenderStyle* pseudo = style();
RenderStyle* style = new RenderStyle();
style->ref();
style->inheritFrom(pseudo);
// Now walk our list of generated content and create render objects for every type
// we encounter.
for (ContentData* contentData = pseudo->contentData();
contentData; contentData = contentData->_nextContent)
{
if (contentData->_contentType == CONTENT_TEXT)
{
RenderText* t = new (renderArena()) RenderText( node(), 0);
t->setIsAnonymous( true );
t->setStyle(style);
t->setText(contentData->contentText());
addChild(t);
}
else if (contentData->_contentType == CONTENT_OBJECT)
{
RenderImage* img = new (renderArena()) RenderImage(node());
img->setIsAnonymous( true );
img->setStyle(style);
img->setContentObject(contentData->contentObject());
addChild(img);
}
else if (contentData->_contentType == CONTENT_COUNTER)
{
// really a counter or just a glyph?
EListStyleType type = (EListStyleType)contentData->contentCounter()->listStyle();
RenderObject *t = 0;
if (isListStyleCounted(type)) {
t = new (renderArena()) RenderCounter( node(), contentData->contentCounter() );
}
else {
t = new (renderArena()) RenderGlyph( node(), type );
}
t->setIsAnonymous( true );
t->setStyle(style);
addChild(t);
}
else if (contentData->_contentType == CONTENT_QUOTE)
{
RenderQuote* t = new (renderArena()) RenderQuote( node(), contentData->contentQuote() );
t->setIsAnonymous( true );
t->setStyle(style);
addChild(t);
}
}
style->deref();
}
RenderContainer* RenderContainer::pseudoContainer(RenderStyle::PseudoId type) const
{
RenderObject *child = 0;
switch (type) {
case RenderStyle::AFTER:
child = lastChild();
break;
case RenderStyle::BEFORE:
child = firstChild();
break;
case RenderStyle::REPLACED:
child = lastChild();
if (child && child->style()->styleType() == RenderStyle::AFTER)
child = child->previousSibling();
break;
default:
child = 0;
}
if (child && child->style()->styleType() == type) {
assert(child->isRenderBlock() || child->isRenderInline());
return static_cast<RenderContainer*>(child);
}
if (type == RenderStyle::AFTER) {
// check continuations
if (continuation())
return continuation()->pseudoContainer(type);
}
if (child && child->isAnonymousBlock())
return static_cast<RenderBlock*>(child)->pseudoContainer(type);
return 0;
}
void RenderContainer::addPseudoContainer(RenderObject* child)
{
RenderStyle::PseudoId type = child->style()->styleType();
switch (type) {
case RenderStyle::AFTER: {
RenderObject *o = this;
while (o->continuation()) o = o->continuation();
// Coalesce inlines
if (child->style()->display() == INLINE && o->lastChild() && o->lastChild()->isAnonymousBlock()) {
o->lastChild()->addChild(child, 0);
} else
o->addChild(child, 0);
break;
}
case RenderStyle::BEFORE:
// Coalesce inlines
if (child->style()->display() == INLINE && firstChild() && firstChild()->isAnonymousBlock()) {
firstChild()->addChild(child, firstChild()->firstChild());
} else
addChild(child, firstChild());
break;
case RenderStyle::REPLACED:
addChild(child, pseudoContainer(RenderStyle::AFTER));
break;
default:
break;
}
}
void RenderContainer::updateReplacedContent()
{
// Only for normal elements
if (!style() || style()->styleType() != RenderStyle::NOPSEUDO)
return;
// delete old generated content
RenderContainer *container = pseudoContainer(RenderStyle::REPLACED);
if (container) {
container->detach();
}
if (style()->useNormalContent()) return;
// create generated content
RenderStyle* pseudo = style()->getPseudoStyle(RenderStyle::REPLACED);
if (!pseudo) {
pseudo = new RenderStyle();
pseudo->inheritFrom(style());
pseudo->setStyleType(RenderStyle::REPLACED);
}
if (pseudo->useNormalContent())
pseudo->setContentData(style()->contentData());
container = RenderFlow::createFlow(node(), pseudo, renderArena());
container->setIsAnonymous( true );
container->createGeneratedContent();
addChild(container, pseudoContainer(RenderStyle::AFTER));
}
void RenderContainer::appendChildNode(RenderObject* newChild)
{
KHTMLAssert(newChild->parent() == 0);
newChild->setParent(this);
RenderObject* lChild = lastChild();
if(lChild)
{
newChild->setPreviousSibling(lChild);
lChild->setNextSibling(newChild);
}
else
setFirstChild(newChild);
setLastChild(newChild);
// Keep our layer hierarchy updated. Optimize for the common case where we don't have any children
// and don't have a layer attached to ourselves.
if (newChild->firstChild() || newChild->layer()) {
RenderLayer* layer = enclosingLayer();
newChild->addLayers(layer, newChild);
}
newChild->setNeedsLayoutAndMinMaxRecalc(); // Goes up the containing block hierarchy.
if (!normalChildNeedsLayout())
setChildNeedsLayout(true); // We may supply the static position for an absolute positioned child.
}
void RenderContainer::insertChildNode(RenderObject* child, RenderObject* beforeChild)
{
if(!beforeChild) {
appendChildNode(child);
return;
}
KHTMLAssert(!child->parent());
while ( beforeChild->parent() != this && beforeChild->parent()->isAnonymousBlock() )
beforeChild = beforeChild->parent();
KHTMLAssert(beforeChild->parent() == this);
if(beforeChild == firstChild())
setFirstChild(child);
RenderObject* prev = beforeChild->previousSibling();
child->setNextSibling(beforeChild);
beforeChild->setPreviousSibling(child);
if(prev) prev->setNextSibling(child);
child->setPreviousSibling(prev);
child->setParent(this);
// Keep our layer hierarchy updated.
RenderLayer* layer = enclosingLayer();
child->addLayers(layer, child);
child->setNeedsLayoutAndMinMaxRecalc();
if (!normalChildNeedsLayout())
setChildNeedsLayout(true); // We may supply the static position for an absolute positioned child.
}
void RenderContainer::layout()
{
KHTMLAssert( needsLayout() );
KHTMLAssert( minMaxKnown() );
const bool pagedMode = canvas()->pagedMode();
RenderObject *child = firstChild();
while( child ) {
if (pagedMode) child->setNeedsLayout(true);
child->layoutIfNeeded();
if (child->containsPageBreak()) setContainsPageBreak(true);
if (child->needsPageClear()) setNeedsPageClear(true);
child = child->nextSibling();
}
setNeedsLayout(false);
}
void RenderContainer::removeLeftoverAnonymousBoxes()
{
// we have to go over all child nodes and remove anonymous boxes, that do _not_
// have inline children to keep the tree flat
RenderObject *child = firstChild();
while( child ) {
RenderObject *next = child->nextSibling();
if ( child->isRenderBlock() && child->isAnonymousBlock() && !child->continuation() &&
!child->childrenInline() && !child->isTableCell() && !child->doNotDelete()) {
RenderObject *firstAnChild = child->firstChild();
RenderObject *lastAnChild = child->lastChild();
if ( firstAnChild ) {
RenderObject *o = firstAnChild;
while( o ) {
o->setParent( this );
o = o->nextSibling();
}
firstAnChild->setPreviousSibling( child->previousSibling() );
lastAnChild->setNextSibling( child->nextSibling() );
if ( child->previousSibling() )
child->previousSibling()->setNextSibling( firstAnChild );
if ( child->nextSibling() )
child->nextSibling()->setPreviousSibling( lastAnChild );
if ( child == firstChild() )
m_first = firstAnChild;
if ( child == lastChild() )
m_last = lastAnChild;
} else {
if ( child->previousSibling() )
child->previousSibling()->setNextSibling( child->nextSibling() );
if ( child->nextSibling() )
child->nextSibling()->setPreviousSibling( child->previousSibling() );
if ( child == firstChild() )
m_first = child->nextSibling();
if ( child == lastChild() )
m_last = child->previousSibling();
}
child->setParent( 0 );
child->setPreviousSibling( 0 );
child->setNextSibling( 0 );
if ( !child->isText() ) {
RenderContainer *c = static_cast<RenderContainer *>(child);
c->m_first = 0;
c->m_next = 0;
}
child->detach();
}
child = next;
}
if ( parent() )
parent()->removeLeftoverAnonymousBoxes();
}
#undef DEBUG_LAYOUT