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/*
* Copyright (C) 2006-2017 Apple 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.
*/
#pragma once
#include <wtf/text/AtomicString.h>
namespace WebCore {
enum class CanWrap : bool { No, Yes };
enum class DidWrap : bool { No, Yes };
class Frame;
class TreeScope;
class FrameTree {
WTF_MAKE_NONCOPYABLE(FrameTree);
public:
const static unsigned invalidCount = static_cast<unsigned>(-1);
FrameTree(Frame& thisFrame, Frame* parentFrame)
: m_thisFrame(thisFrame)
, m_parent(parentFrame)
, m_previousSibling(nullptr)
, m_lastChild(nullptr)
, m_scopedChildCount(invalidCount)
{
}
~FrameTree();
const AtomicString& name() const { return m_name; }
const AtomicString& uniqueName() const { return m_uniqueName; }
WEBCORE_EXPORT void setName(const AtomicString&);
WEBCORE_EXPORT void clearName();
WEBCORE_EXPORT Frame* parent() const;
void setParent(Frame* parent) { m_parent = parent; }
Frame* nextSibling() const { return m_nextSibling.get(); }
Frame* previousSibling() const { return m_previousSibling; }
Frame* firstChild() const { return m_firstChild.get(); }
Frame* lastChild() const { return m_lastChild; }
Frame* firstRenderedChild() const;
Frame* nextRenderedSibling() const;
WEBCORE_EXPORT bool isDescendantOf(const Frame* ancestor) const;
WEBCORE_EXPORT Frame* traverseNext(const Frame* stayWithin = nullptr) const;
// Rendered means being the main frame or having an ownerRenderer. It may not have been parented in the Widget tree yet (see WidgetHierarchyUpdatesSuspensionScope).
WEBCORE_EXPORT Frame* traverseNextRendered(const Frame* stayWithin = nullptr) const;
WEBCORE_EXPORT Frame* traverseNext(CanWrap, DidWrap* = nullptr) const;
WEBCORE_EXPORT Frame* traversePrevious(CanWrap, DidWrap* = nullptr) const;
Frame* traverseNextInPostOrder(CanWrap) const;
WEBCORE_EXPORT void appendChild(Frame&);
void detachFromParent() { m_parent = nullptr; }
void removeChild(Frame&);
Frame* child(unsigned index) const;
Frame* child(const AtomicString& name) const;
WEBCORE_EXPORT Frame* find(const AtomicString& name) const;
WEBCORE_EXPORT unsigned childCount() const;
AtomicString uniqueChildName(const AtomicString& requestedName) const;
WEBCORE_EXPORT Frame& top() const;
WEBCORE_EXPORT Frame* scopedChild(unsigned index) const;
WEBCORE_EXPORT Frame* scopedChild(const AtomicString& name) const;
unsigned scopedChildCount() const;
unsigned indexInParent() const;
private:
Frame* deepFirstChild() const;
Frame* deepLastChild() const;
bool scopedBy(TreeScope*) const;
Frame* scopedChild(unsigned index, TreeScope*) const;
Frame* scopedChild(const AtomicString& name, TreeScope*) const;
unsigned scopedChildCount(TreeScope*) const;
Frame& m_thisFrame;
Frame* m_parent;
AtomicString m_name; // The actual frame name (may be empty).
AtomicString m_uniqueName;
RefPtr<Frame> m_nextSibling;
Frame* m_previousSibling;
RefPtr<Frame> m_firstChild;
Frame* m_lastChild;
mutable unsigned m_scopedChildCount;
};
} // namespace WebCore
#if ENABLE(TREE_DEBUGGING)
// Outside the WebCore namespace for ease of invocation from the debugger.
WEBCORE_EXPORT void showFrameTree(const WebCore::Frame*);
#endif
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