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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef OpenedFrameTracker_h
#define OpenedFrameTracker_h
#include "wtf/HashSet.h"
#include "wtf/Noncopyable.h"
namespace blink {
class Visitor;
class InlinedGlobalMarkingVisitor;
class WebFrame;
// Small helper class to track the set of frames that a WebFrame has opened.
// Due to layering restrictions, we need to hide the implementation, since
// public/web/ cannot depend on wtf/.
class OpenedFrameTracker {
WTF_MAKE_NONCOPYABLE(OpenedFrameTracker);
public:
OpenedFrameTracker();
~OpenedFrameTracker();
bool isEmpty() const;
void add(WebFrame*);
void remove(WebFrame*);
// Helper used when swapping a frame into the frame tree: this updates the
// opener for opened frames to point to the new frame being swapped in.
void transferTo(WebFrame*);
void traceFrames(Visitor*);
void traceFrames(InlinedGlobalMarkingVisitor);
private:
template <typename VisitorDispatcher>
void traceFramesImpl(VisitorDispatcher);
WTF::HashSet<WebFrame*> m_openedFrames;
};
} // namespace blink
#endif // WebFramePrivate_h
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