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; 17a02191e04bc25c4935f804f2c080ae28663d096dBen Murdochclass View; 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Observers can listen to various events on the Widgets. 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class VIEWS_EXPORT WidgetObserver { 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // The closing notification is sent immediately in response to (i.e. in the 232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // same call stack as) a request to close the Widget (via Close() or 242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // CloseNow()). 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void OnWidgetClosing(Widget* widget) {} 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 272a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Invoked after notification is received from the event loop that the native 282a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // widget has been created. 292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) virtual void OnWidgetCreated(Widget* widget) {} 302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // The destroying event occurs immediately before the widget is destroyed. 322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // This typically occurs asynchronously with respect the the close request, as 332a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // a result of a later invocation from the event loop. 342a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) virtual void OnWidgetDestroying(Widget* widget) {} 352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Invoked after notification is received from the event loop that the native 372a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // widget has been destroyed. 382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) virtual void OnWidgetDestroyed(Widget* widget) {} 392a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 403551c9c881056c480085172ff9840cab31610854Torne (Richard Coles) virtual void OnWidgetVisibilityChanging(Widget* widget, bool visible) {} 413551c9c881056c480085172ff9840cab31610854Torne (Richard Coles) 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void OnWidgetVisibilityChanged(Widget* widget, bool visible) {} 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void OnWidgetActivationChanged(Widget* widget, bool active) {} 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) virtual void OnWidgetBoundsChanged(Widget* widget, 472a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const gfx::Rect& new_bounds) {} 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) protected: 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual ~WidgetObserver() {} 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace views 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif // UI_VIEWS_WIDGET_WIDGET_OBSERVER_H_ 56