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// Copyright (c) 2013 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 UI_V2_PUBLIC_VIEW_OBSERVER_H_
#define UI_V2_PUBLIC_VIEW_OBSERVER_H_
#include "ui/v2/public/v2_export.h"
namespace gfx {
class Rect;
}
namespace v2 {
class View;
// Observe View disposition changes. -ing methods are called before the change
// is committed, -ed methods are called after.
class V2_EXPORT ViewObserver {
public:
// Whether a notification is being sent before or after some property has
// changed.
enum DispositionChangePhase {
DISPOSITION_CHANGING,
DISPOSITION_CHANGED
};
// Tree.
struct TreeChangeParams {
TreeChangeParams();
View* target;
View* old_parent;
View* new_parent;
View* receiver;
DispositionChangePhase phase;
};
// Called when a node is added or removed. Notifications are sent to the
// following hierarchies in this order:
// 1. |target|.
// 2. |target|'s child hierarchy.
// 3. |target|'s parent hierarchy in its |old_parent|
// (only for Changing notifications).
// 3. |target|'s parent hierarchy in its |new_parent|.
// (only for Changed notifications).
// This sequence is performed via the OnTreeChange notification below before
// and after the change is committed.
virtual void OnViewTreeChange(const TreeChangeParams& params) {}
// TODO(beng): stacking change notification?
// Disposition.
virtual void OnViewDestroying() {}
virtual void OnViewDestroyed() {}
virtual void OnViewBoundsChanged(const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds) {}
virtual void OnViewVisibilityChanging() {}
virtual void OnViewVisibilityChanged() {}
protected:
virtual ~ViewObserver() {}
};
} // namespace v2
#endif // UI_V2_PUBLIC_VIEW_OBSERVER_H_
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