Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Navigation / NavigatingCancelEventArgs.cs / 1305600 / NavigatingCancelEventArgs.cs
//---------------------------------------------------------------------------------------------- // File: NavigatingCancelEventArgs.cs // // Copyright (C) 2004 by Microsoft Corporation. All rights reserved. // // Description: // This event is fired before we start a navigation. The NavigationMode // property specifies the type of navigation (normal, refresh, journal) // This event is fired on INavigator and refired on the Application // // History: // 08/10/04: kusumav Moved out of Application.cs to its own separate file. // //--------------------------------------------------------------------------------------------- using System.ComponentModel; using System.Net; namespace System.Windows.Navigation { ////// Event args for Navigating event. /// The NavigatingCancelEventArgs contain the uri or root element of the content being navigated to /// and an enum value that indicates the type of navigation. Canceling this event prevents the /// application from navigating. By default, Cancel is set to false. /// Note: An application hosted in the browser cannot prevent navigation away from the application /// by canceling this event. /// Note: In the PDC build, if an application hosts the WebOC, this event is not raised for /// navigations within the WebOC. /// public class NavigatingCancelEventArgs : CancelEventArgs { // Internal constructor // URI of the markup page being navigated to. // Root of the element tree being navigated to. // Enum {New, Back, Forward, Refresh} // navigator that raised this event internal NavigatingCancelEventArgs( Uri uri, Object content, CustomContentState customContentState, Object extraData, NavigationMode navigationMode, WebRequest request, object Navigator, bool isNavInitiator) { _uri = uri; _content = content; _targetContentState = customContentState; _navigationMode = navigationMode; _extraData = extraData; _webRequest = request; _isNavInitiator = isNavInitiator; _navigator = Navigator; } ////// URI of the markup page being navigated to. /// public Uri Uri { get { return _uri; } } ////// Root of the element tree being navigated to. /// Note: Only one of the Content or Uri property will be set, depending on whether /// the navigation was to a Uri or an existing element tree. /// public Object Content { get { return _content; } } ///Target custom content state or view state public CustomContentState TargetContentState { get { return _targetContentState; } } ////// An event handler can set this property to the current content state or view state, to be /// saved in a journal entry. If not provided here, the framework will call /// IProvideCustomContentState.GetContentState() on the current Content object. /// public CustomContentState ContentStateToSave { set { _contentStateToSave = value; } get { return _contentStateToSave; } } ////// Exposes extra data object which was optionally passed as a parameter to Navigate. /// public Object ExtraData { //Though we are handing out an object that may potentially contain //sensitive information, no one can use it except the app developer //unless they have type information for this object. One cannot de-serialize //this without Serialization permissions which are not granted by default //in partial trust scenarios. get { return _extraData; } } ////// NavigationMode Enum {New, Back, Forward, Refresh} - where New means a new navigation, /// Forward, Back, and Refresh mean the navigation was initiated from the GoForward, GoBack, /// or Refresh method (or corresponding UI button). /// public NavigationMode NavigationMode { get { return _navigationMode; } } ////// Exposes the WebRequest used to retrieve content. This enables access to HTTP headers. /// public WebRequest WebRequest { get { return _webRequest; } } ////// Indicates whether this navigator is initiating the navigation or whether a parent /// navigator is being navigated (e.g., the current navigator is a frame /// inside a page thats being navigated to inside a parent navigator). A developer /// can use this property to determine whether to spin the globe on a LoadStarted event or /// to stop spinning the globe on a LoadCompleted event. /// If this property is False, the navigators parent navigator is also navigating and /// the globe is already spinning. /// If this property is True, the navigation was initiated inside the current frame and /// the developer should spin the globe (or stop spinning the globe, depending on /// which event is being handled.) /// public bool IsNavigationInitiator { get { return _isNavInitiator; } } ////// The navigator that raised this event /// public object Navigator { get { return _navigator; } } private Uri _uri; private Object _content; private CustomContentState _targetContentState, _contentStateToSave; private Object _extraData; private NavigationMode _navigationMode; private WebRequest _webRequest; private bool _isNavInitiator; object _navigator; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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