1 /* 2 * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * (C) 1999 Antti Koivisto (koivisto (at) kde.org) 4 * (C) 2001 Dirk Mueller (mueller (at) kde.org) 5 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. 6 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) 7 * Copyright (C) 2011 Google Inc. All rights reserved. 8 * 9 * This library is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU Library General Public 11 * License as published by the Free Software Foundation; either 12 * version 2 of the License, or (at your option) any later version. 13 * 14 * This library is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * Library General Public License for more details. 18 * 19 * You should have received a copy of the GNU Library General Public License 20 * along with this library; see the file COPYING.LIB. If not, write to 21 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 22 * Boston, MA 02110-1301, USA. 23 * 24 */ 25 26 #include "config.h" 27 #include "core/dom/RenderTreeBuilder.h" 28 29 #include "core/HTMLNames.h" 30 #include "core/SVGNames.h" 31 #include "core/css/resolver/StyleResolver.h" 32 #include "core/dom/Fullscreen.h" 33 #include "core/dom/Node.h" 34 #include "core/dom/Text.h" 35 #include "core/rendering/RenderFullScreen.h" 36 #include "core/rendering/RenderObject.h" 37 #include "core/rendering/RenderText.h" 38 #include "core/rendering/RenderView.h" 39 #include "core/svg/SVGElement.h" 40 #include "platform/RuntimeEnabledFeatures.h" 41 42 namespace blink { 43 44 RenderObject* RenderTreeBuilder::nextRenderer() const 45 { 46 ASSERT(m_renderingParent); 47 48 Element* element = m_node->isElementNode() ? toElement(m_node) : 0; 49 50 if (element && element->isInTopLayer()) 51 return NodeRenderingTraversal::nextInTopLayer(element); 52 53 // Avoid an O(N^2) walk over the children when reattaching all children of a node. 54 if (m_renderingParent->needsAttach()) 55 return 0; 56 57 return NodeRenderingTraversal::nextSiblingRenderer(m_node); 58 } 59 60 RenderObject* RenderTreeBuilder::parentRenderer() const 61 { 62 ASSERT(m_renderingParent); 63 64 Element* element = m_node->isElementNode() ? toElement(m_node) : 0; 65 66 if (element && m_renderingParent->renderer()) { 67 // FIXME: Guarding this by m_renderingParent->renderer() isn't quite right as the spec for 68 // top layer only talks about display: none ancestors so putting a <dialog> inside an 69 // <optgroup> seems like it should still work even though this check will prevent it. 70 if (element->isInTopLayer()) 71 return m_node->document().renderView(); 72 } 73 74 return m_renderingParent->renderer(); 75 } 76 77 bool RenderTreeBuilder::shouldCreateRenderer() const 78 { 79 if (!m_renderingParent) 80 return false; 81 if (m_node->isSVGElement()) { 82 // SVG elements only render when inside <svg>, or if the element is an <svg> itself. 83 if (!isSVGSVGElement(*m_node) && !m_renderingParent->isSVGElement()) 84 return false; 85 if (!toSVGElement(m_node)->isValid()) 86 return false; 87 } 88 RenderObject* parentRenderer = this->parentRenderer(); 89 if (!parentRenderer) 90 return false; 91 if (!parentRenderer->canHaveChildren()) 92 return false; 93 return true; 94 } 95 96 RenderStyle& RenderTreeBuilder::style() const 97 { 98 if (!m_style) 99 m_style = toElement(m_node)->styleForRenderer(); 100 return *m_style; 101 } 102 103 void RenderTreeBuilder::createRendererForElementIfNeeded() 104 { 105 ASSERT(!m_node->renderer()); 106 107 if (!shouldCreateRenderer()) 108 return; 109 110 Element* element = toElement(m_node); 111 RenderStyle& style = this->style(); 112 113 if (!element->rendererIsNeeded(style)) 114 return; 115 116 RenderObject* newRenderer = element->createRenderer(&style); 117 if (!newRenderer) 118 return; 119 120 RenderObject* parentRenderer = this->parentRenderer(); 121 122 if (!parentRenderer->isChildAllowed(newRenderer, &style)) { 123 newRenderer->destroy(); 124 return; 125 } 126 127 // Make sure the RenderObject already knows it is going to be added to a RenderFlowThread before we set the style 128 // for the first time. Otherwise code using inRenderFlowThread() in the styleWillChange and styleDidChange will fail. 129 newRenderer->setFlowThreadState(parentRenderer->flowThreadState()); 130 131 RenderObject* nextRenderer = this->nextRenderer(); 132 element->setRenderer(newRenderer); 133 newRenderer->setStyle(&style); // setStyle() can depend on renderer() already being set. 134 135 if (Fullscreen::isActiveFullScreenElement(*element)) { 136 newRenderer = RenderFullScreen::wrapRenderer(newRenderer, parentRenderer, &element->document()); 137 if (!newRenderer) 138 return; 139 } 140 141 // Note: Adding newRenderer instead of renderer(). renderer() may be a child of newRenderer. 142 parentRenderer->addChild(newRenderer, nextRenderer); 143 } 144 145 void RenderTreeBuilder::createRendererForTextIfNeeded() 146 { 147 ASSERT(!m_node->renderer()); 148 149 if (!shouldCreateRenderer()) 150 return; 151 152 Text* textNode = toText(m_node); 153 RenderObject* parentRenderer = this->parentRenderer(); 154 155 m_style = parentRenderer->style(); 156 157 if (!textNode->textRendererIsNeeded(*m_style, *parentRenderer)) 158 return; 159 160 RenderText* newRenderer = textNode->createTextRenderer(m_style.get()); 161 if (!parentRenderer->isChildAllowed(newRenderer, m_style.get())) { 162 newRenderer->destroy(); 163 return; 164 } 165 166 // Make sure the RenderObject already knows it is going to be added to a RenderFlowThread before we set the style 167 // for the first time. Otherwise code using inRenderFlowThread() in the styleWillChange and styleDidChange will fail. 168 newRenderer->setFlowThreadState(parentRenderer->flowThreadState()); 169 170 RenderObject* nextRenderer = this->nextRenderer(); 171 textNode->setRenderer(newRenderer); 172 // Parent takes care of the animations, no need to call setAnimatableStyle. 173 newRenderer->setStyle(m_style.release()); 174 parentRenderer->addChild(newRenderer, nextRenderer); 175 } 176 177 } 178
