layout_tree_builder.h | Explore in Territory

/*
 * Copyright (C) 1999 Lars Knoll ([email protected])
 *           (C) 1999 Antti Koivisto ([email protected])
 *           (C) 2001 Dirk Mueller ([email protected])
 * 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
 * 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.
 *
 */

#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_DOM_LAYOUT_TREE_BUILDER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_DOM_LAYOUT_TREE_BUILDER_H_

#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/flat_tree_traversal.h"
#include "third_party/blink/renderer/core/dom/node.h"
#include "third_party/blink/renderer/core/dom/text.h"
#include "third_party/blink/renderer/core/layout/layout_inline.h"
#include "third_party/blink/renderer/core/layout/layout_object.h"
#include "third_party/blink/renderer/core/layout/layout_text.h"

namespace blink {

class ComputedStyle;

// The LayoutTreeBuilder class uses the DOM tree and CSS style rules as input to
// form a LayoutObject Tree which is then used for layout computations in a
// later stage.

// To construct the LayoutObject tree, the LayoutTreeBuilder does the following:
// 1. Starting at the root of the DOM tree, traverse each visible node.
//    Visibility is determined by
//    LayoutTreeBuilderFor{Element,Text}::ShouldCreateLayoutObject() functions.
// 2. For each visible node, ensure that the style has been resolved (either by
//    getting the ComputedStyle passed on to the LayoutTreeBuilder or by forcing
//    style resolution). This is done in LayoutTreeBuilderForElement::Style().
// 3. Emit visible LayoutObjects with content and their computed styles.
//    This is dealt with by the
//    LayoutTreeBuilderFor{Element,Text}::CreateLayoutObject() functions.
template <typename NodeType>
class LayoutTreeBuilder { … };

class LayoutTreeBuilderForElement : public LayoutTreeBuilder<Element> { … };

class LayoutTreeBuilderForText : public LayoutTreeBuilder<Text> { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_DOM_LAYOUT_TREE_BUILDER_H_
chromium/third_party/blink/renderer/core/dom/layout_tree_builder.h
