15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef UI_VIEWS_WIDGET_WIDGET_OBSERVER_H_ 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define UI_VIEWS_WIDGET_WIDGET_OBSERVER_H_ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ui/views/views_export.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 102a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)namespace gfx { 112a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)class Rect; 122a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 132a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace views { 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class Widget; 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Observers can listen to various events on the Widgets. 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class VIEWS_EXPORT WidgetObserver { 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // The closing notification is sent immediately in response to (i.e. in the 222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // same call stack as) a request to close the Widget (via Close() or 232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // CloseNow()). 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void OnWidgetClosing(Widget* widget) {} 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 262a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Invoked after notification is received from the event loop that the native 272a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // widget has been created. 282a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) virtual void OnWidgetCreated(Widget* widget) {} 292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // The destroying event occurs immediately before the widget is destroyed. 312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // This typically occurs asynchronously with respect the the close request, as 322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // a result of a later invocation from the event loop. 332a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) virtual void OnWidgetDestroying(Widget* widget) {} 342a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Invoked after notification is received from the event loop that the native 362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // widget has been destroyed. 372a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) virtual void OnWidgetDestroyed(Widget* widget) {} 382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 393551c9c881056c480085172ff9840cab31610854Torne (Richard Coles) virtual void OnWidgetVisibilityChanging(Widget* widget, bool visible) {} 403551c9c881056c480085172ff9840cab31610854Torne (Richard Coles) 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void OnWidgetVisibilityChanged(Widget* widget, bool visible) {} 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void OnWidgetActivationChanged(Widget* widget, bool active) {} 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 452a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) virtual void OnWidgetBoundsChanged(Widget* widget, 462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const gfx::Rect& new_bounds) {} 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) protected: 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual ~WidgetObserver() {} 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace views 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif // UI_VIEWS_WIDGET_WIDGET_OBSERVER_H_ 55