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// Copyright 2016 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_VIEWS_VIEW_OBSERVER_H_
#define UI_VIEWS_VIEW_OBSERVER_H_
#include "ui/views/views_export.h"
namespace views {
class View;
// ViewObserver is used to observe changes to a View. The first argument to all
// ViewObserver functions is the View the observer was added to.
class VIEWS_EXPORT ViewObserver {
public:
// Called when |child| is added as a child to |observed_view|.
virtual void OnChildViewAdded(View* observed_view, View* child) {}
// Called when |child| is removed as a child of |observed_view|.
virtual void OnChildViewRemoved(View* observed_view, View* child) {}
// Called when View::SetVisible() is called with a new value. See
// View::IsDrawn() for details on how visibility and drawn differ.
virtual void OnViewVisibilityChanged(View* observed_view) {}
// Called when View::SetEnabled() is called with a new value.
virtual void OnViewEnabledChanged(View* observed_view) {}
// Called from View::PreferredSizeChanged().
virtual void OnViewPreferredSizeChanged(View* observed_view) {}
// Called when the bounds of |observed_view| change.
virtual void OnViewBoundsChanged(View* observed_view) {}
// Called when a child is reordered among its siblings, specifically
// View::ReorderChildView() is called on |observed_view|.
virtual void OnChildViewReordered(View* observed_view, View* child) {}
// Called when the active NativeTheme has changed for |observed_view|.
virtual void OnViewNativeThemeChanged(View* observed_view) {}
// Called from ~View.
virtual void OnViewIsDeleting(View* observed_view) {}
protected:
virtual ~ViewObserver() {}
};
} // namespace views
#endif // UI_VIEWS_VIEW_OBSERVER_H_
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