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/*
* Copyright (C) 2006 Apple Computer, Inc.
*
* 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 FrameTree_h
#define FrameTree_h
#include "base/macros.h"
#include "core/CoreExport.h"
#include "platform/heap/Handle.h"
#include "platform/wtf/text/AtomicString.h"
namespace blink {
class Frame;
class CORE_EXPORT FrameTree final {
DISALLOW_NEW();
public:
explicit FrameTree(Frame* this_frame);
~FrameTree();
const AtomicString& GetName() const;
enum ReplicationPolicy {
// Does not propagate name changes beyond this FrameTree object.
kDoNotReplicate,
// Kicks-off propagation of name changes to other renderers.
kReplicate,
};
void SetName(const AtomicString&, ReplicationPolicy = kDoNotReplicate);
// TODO(andypaicu): remove this once we have gathered the data
void ExperimentalSetNulledName();
Frame* Parent() const;
Frame& Top() const;
Frame* NextSibling() const;
Frame* FirstChild() const;
bool IsDescendantOf(const Frame* ancestor) const;
Frame* TraverseNext(const Frame* stay_within = nullptr) const;
Frame* Find(const AtomicString& name) const;
unsigned ChildCount() const;
Frame* ScopedChild(unsigned index) const;
// https://whatwg.org/C/window-object.html#named-access-on-the-window-object
// This implements the steps needed for looking up a child browsing context
// that matches |name|. If |name.IsEmpty()| is true, this is guaranteed to
// return null: the spec specifically states that browsing contexts with a
// name are never considered.
Frame* ScopedChild(const AtomicString& name) const;
unsigned ScopedChildCount() const;
void InvalidateScopedChildCount();
void Trace(blink::Visitor*);
private:
Member<Frame> this_frame_;
AtomicString name_; // The actual frame name (may be empty).
mutable unsigned scoped_child_count_;
// TODO(andypaicu): remove this once we have gathered the data
bool experimental_set_nulled_name_;
DISALLOW_COPY_AND_ASSIGN(FrameTree);
};
} // namespace blink
#ifndef NDEBUG
// Outside the WebCore namespace for ease of invocation from gdb.
void showFrameTree(const blink::Frame*);
#endif
#endif // FrameTree_h
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