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// Copyright (c) 2012 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_WIDGET_WIDGET_OBSERVER_H_
#define UI_VIEWS_WIDGET_WIDGET_OBSERVER_H_
#include "base/observer_list_types.h"
#include "ui/views/views_export.h"
namespace gfx {
class Rect;
}
namespace views {
class Widget;
// Observers can listen to various events on the Widgets.
class VIEWS_EXPORT WidgetObserver : public base::CheckedObserver {
public:
// The closing notification is sent immediately in response to (i.e. in the
// same call stack as) a request to close the Widget (via Close() or
// CloseNow()).
// TODO(crbug.com/1240365): Remove this, this API is too scary. Users of this
// API can expect it to always be called, but it's only called on the same
// stack as a close request. If the Widget closes due to OS native-widget
// destruction this is never called. Replace existing uses with
// OnWidgetDestroying() or by using ViewTrackers to track View lifetimes.
virtual void OnWidgetClosing(Widget* widget) {}
// Invoked after notification is received from the event loop that the native
// widget has been created.
virtual void OnWidgetCreated(Widget* widget) {}
// The destroying event occurs immediately before the widget is destroyed.
// This typically occurs asynchronously with respect the the close request, as
// a result of a later invocation from the event loop.
virtual void OnWidgetDestroying(Widget* widget) {}
// Invoked after notification is received from the event loop that the native
// widget has been destroyed.
virtual void OnWidgetDestroyed(Widget* widget) {}
// Called before RunShellDrag() is called and after it returns.
virtual void OnWidgetDragWillStart(Widget* widget) {}
virtual void OnWidgetDragComplete(Widget* widget) {}
virtual void OnWidgetVisibilityChanged(Widget* widget, bool visible) {}
virtual void OnWidgetActivationChanged(Widget* widget, bool active) {}
virtual void OnWidgetBoundsChanged(Widget* widget,
const gfx::Rect& new_bounds) {}
virtual void OnWidgetThemeChanged(Widget* widget) {}
protected:
~WidgetObserver() override = default;
};
} // namespace views
#endif // UI_VIEWS_WIDGET_WIDGET_OBSERVER_H_
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