RenderTreeBuilder => RenderTreeBuilderForElement and RenderTreeBuilderForText

Source/core/dom/RenderTreeBuilder.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 25 matching lines @@
 #include "core/dom/Text.h"
 #include "core/rendering/RenderFullScreen.h"
 #include "core/rendering/RenderObject.h"
 #include "core/rendering/RenderText.h"
 #include "core/rendering/RenderView.h"
 #include "core/svg/SVGElement.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
-RenderTreeBuilder::RenderTreeBuilder(Node* node, RenderStyle* style)
-    : m_node(node)
-    , m_renderingParent(nullptr)
+RenderTreeBuilderForElement::RenderTreeBuilderForElement(Element* element, RenderStyle* style)
+    : RenderTreeBuilder(element, nullptr)
     , m_style(style)
 {
-    ASSERT(!node->renderer());
-    ASSERT(node->needsAttach());
-    ASSERT(node->document().inStyleRecalc());
-
-    // FIXME: We should be able to ASSERT(node->inActiveDocument()) but childrenChanged is called
-    // before ChildNodeInsertionNotifier in ContainerNode's methods and some implementations
-    // will trigger a layout inside childrenChanged.
-    // Mainly HTMLTextAreaElement::childrenChanged calls HTMLTextFormControlElement::setSelectionRange
-    // which does an updateLayoutIgnorePendingStylesheets.
-
-    Element* element = node->isElementNode() ? toElement(node) : 0;
-    if (element && element->isFirstLetterPseudoElement()) {
+    if (element->isFirstLetterPseudoElement()) {
         if (RenderObject* nextRenderer = FirstLetterPseudoElement::firstLetterTextRenderer(*element))
             m_renderingParent = nextRenderer->parent();
-    } else if (ContainerNode* containerNode = NodeRenderingTraversal::parent(node, &m_parentDetails)) {
+    } else if (ContainerNode* containerNode = NodeRenderingTraversal::parent(element)) {
         m_renderingParent = containerNode->renderer();
     }
 }
 
-RenderObject* RenderTreeBuilder::nextRenderer() const
+RenderObject* RenderTreeBuilderForElement::nextRenderer() const
 {
     ASSERT(m_renderingParent);
 
-    Element* element = m_node->isElementNode() ? toElement(m_node) : 0;
+    if (m_node->isInTopLayer())
+        return NodeRenderingTraversal::nextInTopLayer(m_node);
 
-    if (element && element->isInTopLayer())
-        return NodeRenderingTraversal::nextInTopLayer(element);
+    if (m_node->isFirstLetterPseudoElement())
+        return FirstLetterPseudoElement::firstLetterTextRenderer(*m_node);
 
-    if (element && element->isFirstLetterPseudoElement())
-        return FirstLetterPseudoElement::firstLetterTextRenderer(*element);
-
-    // Avoid an O(N^2) walk over the children when reattaching all children of a node.
-    if (m_renderingParent->node() && m_renderingParent->node()->needsAttach())
-        return 0;
-
-    return NodeRenderingTraversal::nextSiblingRenderer(m_node);
+    return RenderTreeBuilder::nextRenderer();
 }
 
-RenderObject* RenderTreeBuilder::parentRenderer() const
+RenderObject* RenderTreeBuilderForElement::parentRenderer() const
 {
-    ASSERT(m_renderingParent);
+    RenderObject* parentRenderer = RenderTreeBuilder::parentRenderer();
 
-    Element* element = m_node->isElementNode() ? toElement(m_node) : 0;
-
-    if (element && m_renderingParent) {
-        // FIXME: Guarding this by m_renderingParent isn't quite right as the spec for
+    if (parentRenderer) {
+        // FIXME: Guarding this by parentRenderer isn't quite right as the spec for
         // top layer only talks about display: none ancestors so putting a <dialog> inside an
         // <optgroup> seems like it should still work even though this check will prevent it.
-        if (element->isInTopLayer())
+        if (m_node->isInTopLayer())
             return m_node->document().renderView();
     }
 
-    return m_renderingParent;
+    return parentRenderer;
 }
 
-bool RenderTreeBuilder::shouldCreateRenderer() const
+bool RenderTreeBuilderForElement::shouldCreateRenderer() const
 {
     if (!m_renderingParent)
         return false;
+
+    // FIXME: Should the following be in SVGElement::rendererIsNeeded()?
     if (m_node->isSVGElement()) {
         // SVG elements only render when inside <svg>, or if the element is an <svg> itself.
         if (!isSVGSVGElement(*m_node) && (!m_renderingParent->node() || !m_renderingParent->node()->isSVGElement()))
             return false;
         if (!toSVGElement(m_node)->isValid())
             return false;
     }
 
     RenderObject* parentRenderer = this->parentRenderer();
     if (!parentRenderer)
         return false;
     if (!parentRenderer->canHaveChildren())
         return false;
-    return true;
+
+    return m_node->rendererIsNeeded(style());
 }
 
-RenderStyle& RenderTreeBuilder::style() const
+RenderStyle& RenderTreeBuilderForElement::style() const
 {
     if (!m_style)
-        m_style = toElement(m_node)->styleForRenderer();
+        m_style = m_node->styleForRenderer();
     return *m_style;
 }
 
-void RenderTreeBuilder::createRendererForElementIfNeeded()
+void RenderTreeBuilderForElement::createRenderer()
 {
-    ASSERT(!m_node->renderer());
-
-    if (!shouldCreateRenderer())
-        return;
-
-    Element* element = toElement(m_node);
     RenderStyle& style = this->style();
 
-    if (!element->rendererIsNeeded(style))
-        return;
-
-    RenderObject* newRenderer = element->createRenderer(&style);
+    RenderObject* newRenderer = m_node->createRenderer(&style);
     if (!newRenderer)
         return;
 
     RenderObject* parentRenderer = this->parentRenderer();
 
     if (!parentRenderer->isChildAllowed(newRenderer, &style)) {
         newRenderer->destroy();
         return;
     }
 
     // Make sure the RenderObject already knows it is going to be added to a RenderFlowThread before we set the style
     // for the first time. Otherwise code using inRenderFlowThread() in the styleWillChange and styleDidChange will fail.
     newRenderer->setFlowThreadState(parentRenderer->flowThreadState());
 
     RenderObject* nextRenderer = this->nextRenderer();
-    element->setRenderer(newRenderer);
+    m_node->setRenderer(newRenderer);
     newRenderer->setStyle(&style); // setStyle() can depend on renderer() already being set.
 
-    if (Fullscreen::isActiveFullScreenElement(*element)) {
-        newRenderer = RenderFullScreen::wrapRenderer(newRenderer, parentRenderer, &element->document());
+    if (Fullscreen::isActiveFullScreenElement(*m_node)) {
+        newRenderer = RenderFullScreen::wrapRenderer(newRenderer, parentRenderer, &m_node->document());
         if (!newRenderer)
             return;
     }
 
     // Note: Adding newRenderer instead of renderer(). renderer() may be a child of newRenderer.
     parentRenderer->addChild(newRenderer, nextRenderer);
 }
 
-void RenderTreeBuilder::createRendererForTextIfNeeded()
+void RenderTreeBuilderForText::createRenderer()
 {
-    ASSERT(!m_node->renderer());
+    RenderObject* parentRenderer = this->parentRenderer();
+    RenderStyle* style = parentRenderer->style();
 
-    if (!shouldCreateRenderer())
-        return;
+    ASSERT(m_node->textRendererIsNeeded(*style, *parentRenderer));
 
-    Text* textNode = toText(m_node);
-    RenderObject* parentRenderer = this->parentRenderer();
-
-    m_style = parentRenderer->style();
-
-    if (!textNode->textRendererIsNeeded(*m_style, *parentRenderer))
-        return;
-
-    RenderText* newRenderer = textNode->createTextRenderer(m_style.get());
-    if (!parentRenderer->isChildAllowed(newRenderer, m_style.get())) {
+    RenderText* newRenderer = m_node->createTextRenderer(style);
+    if (!parentRenderer->isChildAllowed(newRenderer, style)) {
         newRenderer->destroy();
         return;
     }
 
     // Make sure the RenderObject already knows it is going to be added to a RenderFlowThread before we set the style
     // for the first time. Otherwise code using inRenderFlowThread() in the styleWillChange and styleDidChange will fail.
     newRenderer->setFlowThreadState(parentRenderer->flowThreadState());
 
     RenderObject* nextRenderer = this->nextRenderer();
-    textNode->setRenderer(newRenderer);
+    m_node->setRenderer(newRenderer);
     // Parent takes care of the animations, no need to call setAnimatableStyle.
-    newRenderer->setStyle(m_style.release());
+    newRenderer->setStyle(style);
     parentRenderer->addChild(newRenderer, nextRenderer);
 }
 
 }