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// Copyright 2015 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 COMPONENTS_VIEW_MANAGER_SERVER_VIEW_DRAWN_TRACKER_H_
#define COMPONENTS_VIEW_MANAGER_SERVER_VIEW_DRAWN_TRACKER_H_
#include <set>
#include "base/basictypes.h"
#include "components/view_manager/server_view_observer.h"
namespace view_manager {
class ServerViewDrawnTrackerObserver;
// ServerViewDrawnTracker notifies its observer any time the drawn state of
// the supplied view changes.
//
// NOTE: you must ensure this class is destroyed before the root.
class ServerViewDrawnTracker : public ServerViewObserver {
public:
ServerViewDrawnTracker(ServerView* view,
ServerViewDrawnTrackerObserver* observer);
~ServerViewDrawnTracker() override;
ServerView* view() { return view_; }
private:
void SetDrawn(ServerView* ancestor, bool drawn);
// Adds |this| as an observer to |view_| and its ancestors.
void AddObservers();
// Stops observerving any views we added as an observer in AddObservers().
void RemoveObservers();
// ServerViewObserver:
void OnViewDestroyed(ServerView* view) override;
void OnViewHierarchyChanged(ServerView* view,
ServerView* new_parent,
ServerView* old_parent) override;
void OnViewVisibilityChanged(ServerView* view) override;
ServerView* view_;
ServerViewDrawnTrackerObserver* observer_;
bool drawn_;
// Set of views we're observing. This is |view_| and all its ancestors.
std::set<ServerView*> views_;
DISALLOW_COPY_AND_ASSIGN(ServerViewDrawnTracker);
};
} // namespace view_manager
#endif // COMPONENTS_VIEW_MANAGER_SERVER_VIEW_DRAWN_TRACKER_H_
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