2 * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
3 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
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28 #include "RenderObjectChildList.h"
30 #include "AXObjectCache.h"
31 #include "ContentData.h"
32 #include "RenderBlock.h"
33 #include "RenderCounter.h"
34 #include "RenderImage.h"
35 #include "RenderImageResourceStyleImage.h"
36 #include "RenderInline.h"
37 #include "RenderLayer.h"
38 #include "RenderListItem.h"
39 #include "RenderQuote.h"
40 #include "RenderStyle.h"
41 #include "RenderTextFragment.h"
42 #include "RenderView.h"
46 void RenderObjectChildList::destroyLeftoverChildren()
48 while (firstChild()) {
49 if (firstChild()->isListMarker() || (firstChild()->style()->styleType() == FIRST_LETTER && !firstChild()->isText()))
50 firstChild()->remove(); // List markers are owned by their enclosing list and so don't get destroyed by this container. Similarly, first letters are destroyed by their remaining text fragment.
51 else if (firstChild()->isRunIn() && firstChild()->node()) {
52 firstChild()->node()->setRenderer(0);
53 firstChild()->node()->setNeedsStyleRecalc();
54 firstChild()->destroy();
56 // Destroy any anonymous children remaining in the render tree, as well as implicit (shadow) DOM elements like those used in the engine-based text fields.
57 if (firstChild()->node())
58 firstChild()->node()->setRenderer(0);
59 firstChild()->destroy();
64 RenderObject* RenderObjectChildList::removeChildNode(RenderObject* owner, RenderObject* oldChild, bool fullRemove)
66 ASSERT(oldChild->parent() == owner);
68 // So that we'll get the appropriate dirty bit set (either that a normal flow child got yanked or
69 // that a positioned child got yanked). We also repaint, so that the area exposed when the child
70 // disappears gets repainted properly.
71 if (!owner->documentBeingDestroyed() && fullRemove && oldChild->m_everHadLayout) {
72 oldChild->setNeedsLayoutAndPrefWidthsRecalc();
73 if (oldChild->isBody())
74 owner->view()->repaint();
79 // If we have a line box wrapper, delete it.
80 if (oldChild->isBox())
81 toRenderBox(oldChild)->deleteLineBoxWrapper();
83 if (!owner->documentBeingDestroyed() && fullRemove) {
84 // if we remove visible child from an invisible parent, we don't know the layer visibility any more
85 RenderLayer* layer = 0;
86 if (owner->style()->visibility() != VISIBLE && oldChild->style()->visibility() == VISIBLE && !oldChild->hasLayer()) {
87 layer = owner->enclosingLayer();
88 layer->dirtyVisibleContentStatus();
91 // Keep our layer hierarchy updated.
92 if (oldChild->firstChild() || oldChild->hasLayer()) {
94 layer = owner->enclosingLayer();
95 oldChild->removeLayers(layer);
98 if (oldChild->isListItem())
99 toRenderListItem(oldChild)->updateListMarkerNumbers();
101 if (oldChild->isPositioned() && owner->childrenInline())
102 owner->dirtyLinesFromChangedChild(oldChild);
105 // Update cached boundaries in SVG renderers, if a child is removed.
106 owner->setNeedsBoundariesUpdate();
110 // If oldChild is the start or end of the selection, then clear the selection to
111 // avoid problems of invalid pointers.
112 // FIXME: The SelectionController should be responsible for this when it
113 // is notified of DOM mutations.
114 if (!owner->documentBeingDestroyed() && oldChild->isSelectionBorder())
115 owner->view()->clearSelection();
118 if (oldChild->previousSibling())
119 oldChild->previousSibling()->setNextSibling(oldChild->nextSibling());
120 if (oldChild->nextSibling())
121 oldChild->nextSibling()->setPreviousSibling(oldChild->previousSibling());
123 if (firstChild() == oldChild)
124 setFirstChild(oldChild->nextSibling());
125 if (lastChild() == oldChild)
126 setLastChild(oldChild->previousSibling());
128 oldChild->setPreviousSibling(0);
129 oldChild->setNextSibling(0);
130 oldChild->setParent(0);
132 RenderCounter::rendererRemovedFromTree(oldChild);
133 RenderQuote::rendererRemovedFromTree(oldChild);
135 if (AXObjectCache::accessibilityEnabled())
136 owner->document()->axObjectCache()->childrenChanged(owner);
141 void RenderObjectChildList::appendChildNode(RenderObject* owner, RenderObject* newChild, bool fullAppend)
143 ASSERT(newChild->parent() == 0);
144 ASSERT(!owner->isBlockFlow() || (!newChild->isTableSection() && !newChild->isTableRow() && !newChild->isTableCell()));
146 newChild->setParent(owner);
147 RenderObject* lChild = lastChild();
150 newChild->setPreviousSibling(lChild);
151 lChild->setNextSibling(newChild);
153 setFirstChild(newChild);
155 setLastChild(newChild);
158 // Keep our layer hierarchy updated. Optimize for the common case where we don't have any children
159 // and don't have a layer attached to ourselves.
160 RenderLayer* layer = 0;
161 if (newChild->firstChild() || newChild->hasLayer()) {
162 layer = owner->enclosingLayer();
163 newChild->addLayers(layer, newChild);
166 // if the new child is visible but this object was not, tell the layer it has some visible content
167 // that needs to be drawn and layer visibility optimization can't be used
168 if (owner->style()->visibility() != VISIBLE && newChild->style()->visibility() == VISIBLE && !newChild->hasLayer()) {
170 layer = owner->enclosingLayer();
172 layer->setHasVisibleContent(true);
175 if (newChild->isListItem())
176 toRenderListItem(newChild)->updateListMarkerNumbers();
178 if (!newChild->isFloatingOrPositioned() && owner->childrenInline())
179 owner->dirtyLinesFromChangedChild(newChild);
181 RenderCounter::rendererSubtreeAttached(newChild);
182 RenderQuote::rendererSubtreeAttached(newChild);
183 newChild->setNeedsLayoutAndPrefWidthsRecalc(); // Goes up the containing block hierarchy.
184 if (!owner->normalChildNeedsLayout())
185 owner->setChildNeedsLayout(true); // We may supply the static position for an absolute positioned child.
187 if (AXObjectCache::accessibilityEnabled())
188 owner->document()->axObjectCache()->childrenChanged(owner);
191 void RenderObjectChildList::insertChildNode(RenderObject* owner, RenderObject* child, RenderObject* beforeChild, bool fullInsert)
194 appendChildNode(owner, child, fullInsert);
198 ASSERT(!child->parent());
199 while (beforeChild->parent() != owner && beforeChild->parent()->isAnonymousBlock())
200 beforeChild = beforeChild->parent();
201 ASSERT(beforeChild->parent() == owner);
203 ASSERT(!owner->isBlockFlow() || (!child->isTableSection() && !child->isTableRow() && !child->isTableCell()));
205 if (beforeChild == firstChild())
206 setFirstChild(child);
208 RenderObject* prev = beforeChild->previousSibling();
209 child->setNextSibling(beforeChild);
210 beforeChild->setPreviousSibling(child);
212 prev->setNextSibling(child);
213 child->setPreviousSibling(prev);
215 child->setParent(owner);
218 // Keep our layer hierarchy updated. Optimize for the common case where we don't have any children
219 // and don't have a layer attached to ourselves.
220 RenderLayer* layer = 0;
221 if (child->firstChild() || child->hasLayer()) {
222 layer = owner->enclosingLayer();
223 child->addLayers(layer, child);
226 // if the new child is visible but this object was not, tell the layer it has some visible content
227 // that needs to be drawn and layer visibility optimization can't be used
228 if (owner->style()->visibility() != VISIBLE && child->style()->visibility() == VISIBLE && !child->hasLayer()) {
230 layer = owner->enclosingLayer();
232 layer->setHasVisibleContent(true);
235 if (child->isListItem())
236 toRenderListItem(child)->updateListMarkerNumbers();
238 if (!child->isFloating() && owner->childrenInline())
239 owner->dirtyLinesFromChangedChild(child);
242 RenderCounter::rendererSubtreeAttached(child);
243 RenderQuote::rendererSubtreeAttached(child);
244 child->setNeedsLayoutAndPrefWidthsRecalc();
245 if (!owner->normalChildNeedsLayout())
246 owner->setChildNeedsLayout(true); // We may supply the static position for an absolute positioned child.
248 if (AXObjectCache::accessibilityEnabled())
249 owner->document()->axObjectCache()->childrenChanged(owner);
252 static RenderObject* findBeforeAfterParent(RenderObject* object)
254 // Only table parts need to search for the :before or :after parent
255 if (!(object->isTable() || object->isTableSection() || object->isTableRow()))
258 RenderObject* beforeAfterParent = object;
259 while (beforeAfterParent && !(beforeAfterParent->isText() || beforeAfterParent->isImage()))
260 beforeAfterParent = beforeAfterParent->firstChild();
261 return beforeAfterParent;
264 RenderObject* RenderObjectChildList::beforePseudoElementRenderer(const RenderObject* owner) const
266 // An anonymous (generated) inline run-in that has PseudoId BEFORE must come from a grandparent.
267 // Therefore we should skip these generated run-ins when checking our immediate children.
268 // If we don't find our :before child immediately, then we should check if we own a
269 // generated inline run-in in the next level of children.
270 RenderObject* first = const_cast<RenderObject*>(owner);
272 // Skip list markers and generated run-ins
273 first = first->firstChild();
274 while (first && (first->isListMarker() || (first->isRenderInline() && first->isRunIn() && first->isAnonymous())))
275 first = first->nextSibling();
276 } while (first && first->isAnonymous() && first->style()->styleType() == NOPSEUDO);
281 if (first->style()->styleType() == BEFORE)
284 // Check for a possible generated run-in, using run-in positioning rules.
285 // Skip inlines and floating / positioned blocks, and place as the first child.
286 first = owner->firstChild();
287 if (!first->isRenderBlock())
289 while (first && first->isFloatingOrPositioned())
290 first = first->nextSibling();
292 first = first->firstChild();
293 // We still need to skip any list markers that could exist before the run-in.
294 while (first && first->isListMarker())
295 first = first->nextSibling();
296 if (first && first->style()->styleType() == BEFORE && first->isRenderInline() && first->isRunIn() && first->isAnonymous())
302 RenderObject* RenderObjectChildList::afterPseudoElementRenderer(const RenderObject* owner) const
304 RenderObject* last = const_cast<RenderObject*>(owner);
306 last = last->lastChild();
307 } while (last && last->isAnonymous() && last->style()->styleType() == NOPSEUDO && !last->isListMarker());
308 if (last && last->style()->styleType() != AFTER)
313 void RenderObjectChildList::updateBeforeAfterContent(RenderObject* owner, PseudoId type, const RenderObject* styledObject)
315 // Double check that the document did in fact use generated content rules. Otherwise we should not have been called.
316 ASSERT(owner->document()->usesBeforeAfterRules());
318 // In CSS2, before/after pseudo-content cannot nest. Check this first.
319 if (owner->style()->styleType() == BEFORE || owner->style()->styleType() == AFTER)
323 styledObject = owner;
325 RenderStyle* pseudoElementStyle = styledObject->getCachedPseudoStyle(type);
329 child = beforePseudoElementRenderer(owner);
332 child = afterPseudoElementRenderer(owner);
335 ASSERT_NOT_REACHED();
339 // Whether or not we currently have generated content attached.
340 bool oldContentPresent = child;
342 // Whether or not we now want generated content.
343 bool newContentWanted = pseudoElementStyle && pseudoElementStyle->display() != NONE;
345 // For <q><p/></q>, if this object is the inline continuation of the <q>, we only want to generate
346 // :after content and not :before content.
347 if (newContentWanted && type == BEFORE && owner->isElementContinuation())
348 newContentWanted = false;
350 // Similarly, if we're the beginning of a <q>, and there's an inline continuation for our object,
351 // then we don't generate the :after content.
352 if (newContentWanted && type == AFTER && owner->virtualContinuation())
353 newContentWanted = false;
355 // If we don't want generated content any longer, or if we have generated content, but it's no longer
356 // identical to the new content data we want to build render objects for, then we nuke all
357 // of the old generated content.
358 if (oldContentPresent && (!newContentWanted || Node::diff(child->style(), pseudoElementStyle) == Node::Detach)) {
360 if (child->style()->styleType() == type) {
361 oldContentPresent = false;
363 child = (type == BEFORE) ? owner->virtualChildren()->firstChild() : owner->virtualChildren()->lastChild();
367 // If we have no pseudo-element style or if the pseudo-element style's display type is NONE, then we
368 // have no generated content and can now return.
369 if (!newContentWanted)
372 if (owner->isRenderInline() && !pseudoElementStyle->isDisplayInlineType() && pseudoElementStyle->floating() == FNONE &&
373 !(pseudoElementStyle->position() == AbsolutePosition || pseudoElementStyle->position() == FixedPosition))
374 // According to the CSS2 spec (the end of section 12.1), the only allowed
375 // display values for the pseudo style are NONE and INLINE for inline flows.
376 // FIXME: CSS2.1 lifted this restriction, but block display types will crash.
377 // For now we at least relax the restriction to allow all inline types like inline-block
379 pseudoElementStyle->setDisplay(INLINE);
381 if (oldContentPresent) {
382 if (child && child->style()->styleType() == type) {
383 // We have generated content present still. We want to walk this content and update our
384 // style information with the new pseudo-element style.
385 child->setStyle(pseudoElementStyle);
387 RenderObject* beforeAfterParent = findBeforeAfterParent(child);
388 if (!beforeAfterParent)
391 // Note that if we ever support additional types of generated content (which should be way off
392 // in the future), this code will need to be patched.
393 for (RenderObject* genChild = beforeAfterParent->firstChild(); genChild; genChild = genChild->nextSibling()) {
394 if (genChild->isText())
395 // Generated text content is a child whose style also needs to be set to the pseudo-element style.
396 genChild->setStyle(pseudoElementStyle);
397 else if (genChild->isImage()) {
398 // Images get an empty style that inherits from the pseudo.
399 RefPtr<RenderStyle> style = RenderStyle::create();
400 style->inheritFrom(pseudoElementStyle);
401 genChild->setStyle(style.release());
403 // RenderListItem may insert a list marker here. We do not need to care about this case.
404 // Otherwise, genChild must be a first-letter container. updateFirstLetter() will take care of it.
405 ASSERT(genChild->isListMarker() || genChild->style()->styleType() == FIRST_LETTER);
409 return; // We've updated the generated content. That's all we needed to do.
412 RenderObject* insertBefore = (type == BEFORE) ? owner->virtualChildren()->firstChild() : 0;
414 // Generated content consists of a single container that houses multiple children (specified
415 // by the content property). This generated content container gets the pseudo-element style set on it.
416 RenderObject* generatedContentContainer = 0;
418 // Walk our list of generated content and create render objects for each.
419 for (const ContentData* content = pseudoElementStyle->contentData(); content; content = content->next()) {
420 RenderObject* renderer = 0;
421 switch (content->type()) {
425 renderer = new (owner->renderArena()) RenderTextFragment(owner->document() /* anonymous object */, content->text());
426 renderer->setStyle(pseudoElementStyle);
428 case CONTENT_OBJECT: {
429 RenderImage* image = new (owner->renderArena()) RenderImage(owner->document()); // anonymous object
430 RefPtr<RenderStyle> style = RenderStyle::create();
431 style->inheritFrom(pseudoElementStyle);
432 image->setStyle(style.release());
433 if (StyleImage* styleImage = content->image())
434 image->setImageResource(RenderImageResourceStyleImage::create(styleImage));
436 image->setImageResource(RenderImageResource::create());
440 case CONTENT_COUNTER:
441 renderer = new (owner->renderArena()) RenderCounter(owner->document(), *content->counter());
442 renderer->setStyle(pseudoElementStyle);
445 renderer = new (owner->renderArena()) RenderQuote(owner->document(), content->quote());
446 renderer->setStyle(pseudoElementStyle);
451 if (!generatedContentContainer) {
452 // Make a generated box that might be any display type now that we are able to drill down into children
453 // to find the original content properly.
454 generatedContentContainer = RenderObject::createObject(owner->document(), pseudoElementStyle);
455 ASSERT(styledObject->node()); // The styled object cannot be anonymous or else it could not have ':before' or ':after' pseudo elements.
456 generatedContentContainer->setNode(styledObject->node()); // This allows access to the generatingNode.
457 generatedContentContainer->setStyle(pseudoElementStyle);
458 if (!owner->isChildAllowed(generatedContentContainer, pseudoElementStyle)) {
459 // The generated content container is not allowed here -> abort.
460 generatedContentContainer->destroy();
464 owner->addChild(generatedContentContainer, insertBefore);
466 if (generatedContentContainer->isChildAllowed(renderer, pseudoElementStyle))
467 generatedContentContainer->addChild(renderer);
474 } // namespace WebCore