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      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 #ifndef RenderTreeBuilder_h
     27 #define RenderTreeBuilder_h
     28 
     29 #include "core/dom/Document.h"
     30 #include "core/dom/Node.h"
     31 #include "core/dom/NodeRenderingTraversal.h"
     32 #include "wtf/RefPtr.h"
     33 
     34 namespace blink {
     35 
     36 class ContainerNode;
     37 class RenderObject;
     38 class RenderStyle;
     39 
     40 class RenderTreeBuilder {
     41     STACK_ALLOCATED();
     42 public:
     43     RenderTreeBuilder(Node* node, RenderStyle* style)
     44         : m_node(node)
     45         , m_renderingParent(nullptr)
     46         , m_style(style)
     47     {
     48         ASSERT(!node->renderer());
     49         ASSERT(node->needsAttach());
     50         ASSERT(node->document().inStyleRecalc());
     51 
     52         // FIXME: We should be able to ASSERT(node->inActiveDocument()) but childrenChanged is called
     53         // before ChildNodeInsertionNotifier in ContainerNode's methods and some implementations
     54         // will trigger a layout inside childrenChanged.
     55         // Mainly HTMLTextAreaElement::childrenChanged calls HTMLTextFormControlElement::setSelectionRange
     56         // which does an updateLayoutIgnorePendingStylesheets.
     57 
     58         m_renderingParent = NodeRenderingTraversal::parent(node, &m_parentDetails);
     59     }
     60 
     61     void createRendererForTextIfNeeded();
     62     void createRendererForElementIfNeeded();
     63 
     64 private:
     65     RenderObject* parentRenderer() const;
     66     RenderObject* nextRenderer() const;
     67     bool shouldCreateRenderer() const;
     68     RenderStyle& style() const;
     69 
     70     RawPtrWillBeMember<Node> m_node;
     71     RawPtrWillBeMember<ContainerNode> m_renderingParent;
     72     NodeRenderingTraversal::ParentDetails m_parentDetails;
     73     mutable RefPtr<RenderStyle> m_style;
     74 };
     75 
     76 } // namespace blink
     77 
     78 #endif
     79