Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebParts / WebPartVerb.cs / 1 / WebPartVerb.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls.WebParts { using System; using System.ComponentModel; using System.Diagnostics; using System.Drawing.Design; using System.Globalization; using System.Security.Permissions; using System.Web.UI.WebControls; using System.Web.Util; [ TypeConverter(typeof(EmptyStringExpandableObjectConverter)) ] [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class WebPartVerb : IStateManager { private bool _isTrackingViewState; private StateBag _viewState; private bool _visible = true; private string _id; private string _clientClickHandler; private WebPartEventHandler _serverClickHandler; private string _eventArgument; // PERF: Don't create the EventArgument string until needed, when the verb is actually rendered. private string _eventArgumentPrefix; // Used when creating default verbs in WebPartZoneBase, CatalogZoneBase, EditorZoneBase. For these // verbs, the clientClickHandler and serverClickHandler are null. The zone has references // to these verbs and can render the verb and handle events by knowing which verb it is // rendering. internal WebPartVerb() { } private WebPartVerb(string id) { if (String.IsNullOrEmpty(id)) { throw ExceptionUtil.ParameterNullOrEmpty("id"); } _id = id; } public WebPartVerb(string id, WebPartEventHandler serverClickHandler) : this(id) { if (serverClickHandler == null) { throw new ArgumentNullException("serverClickHandler"); } _serverClickHandler = serverClickHandler; } public WebPartVerb(string id, string clientClickHandler) : this(id) { if (String.IsNullOrEmpty(clientClickHandler)) { throw new ArgumentNullException("clientClickHandler"); } _clientClickHandler = clientClickHandler; } public WebPartVerb(string id, WebPartEventHandler serverClickHandler, string clientClickHandler) : this(id) { if (serverClickHandler == null) { throw new ArgumentNullException("serverClickHandler"); } if (String.IsNullOrEmpty(clientClickHandler)) { throw new ArgumentNullException("clientClickHandler"); } _serverClickHandler = serverClickHandler; _clientClickHandler = clientClickHandler; } [ DefaultValue(false), NotifyParentProperty(true), Themeable(false), WebSysDescription(SR.WebPartVerb_Checked), ] public virtual bool Checked { get { object b = ViewState["Checked"]; return (b != null) ? (bool)b : false ; } set { ViewState["Checked"] = value; } } [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) ] public string ClientClickHandler { get { return (_clientClickHandler == null) ? String.Empty: _clientClickHandler; } } [ Localizable(true), NotifyParentProperty(true), // Must use WebSysDefaultValue instead of DefaultValue, since it is overridden in extending classes WebSysDefaultValue(""), WebSysDescription(SR.WebPartVerb_Description), ] public virtual string Description { get { object o = ViewState["Description"]; return (o == null) ? String.Empty : (string)o; } set { ViewState["Description"] = value; } } [ DefaultValue(true), NotifyParentProperty(true), Themeable(false), WebSysDescription(SR.WebPartVerb_Enabled), ] public virtual bool Enabled { get { object b = ViewState["Enabled"]; return (b != null) ? (bool)b : true; } set { ViewState["Enabled"] = value; } } ////// Used to assign an event argument to the verb that will be rendered later. /// internal string EventArgument { get { return (_eventArgument != null) ? _eventArgument : String.Empty; } set { _eventArgument = value; } } [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) ] public string ID { get { return (_id != null) ? _id : String.Empty; } } [ DefaultValue(""), Editor("System.Web.UI.Design.ImageUrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), NotifyParentProperty(true), UrlProperty(), WebSysDescription(SR.WebPartVerb_ImageUrl), ] public virtual string ImageUrl { get { object o = ViewState["ImageUrl"]; return (o == null) ? String.Empty : (string)o; } set { ViewState["ImageUrl"] = value; } } protected virtual bool IsTrackingViewState { get { return _isTrackingViewState; } } [ Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) ] public WebPartEventHandler ServerClickHandler { get { return _serverClickHandler; } } ////// The text to be displayed for the webPartVerb. /// [ Localizable(true), NotifyParentProperty(true), // Must use WebSysDefaultValue instead of DefaultValue, since it is overridden in extending classes WebSysDefaultValue(""), WebSysDescription(SR.WebPartVerb_Text), ] public virtual string Text { get { object o = ViewState["Text"]; return (o == null) ? String.Empty : (string)o; } set { ViewState["Text"] = value; } } [ DefaultValue(true), NotifyParentProperty(true), Themeable(false), WebSysDescription(SR.WebPartVerb_Visible), ] public virtual bool Visible { get { return _visible; } set { _visible = value; ViewState["Visible"] = value; } } protected StateBag ViewState { get { if (_viewState == null) { _viewState = new StateBag(false); if (_isTrackingViewState) { ((IStateManager)_viewState).TrackViewState(); } } return _viewState; } } // PERF: Don't create the EventArgument string until needed, when the verb is actually rendered. // Only called by WebPartChrome and WebPartMenu. The verbs in CatalogZone, EditorZone, and // ConnectionsZone just use the EventArgument property. internal string GetEventArgument(string webPartID) { // If the prefix was never set, it means we are a user-specified verb with only a // client click handler. So we should return String.Empty for our EventArgument. if (String.IsNullOrEmpty(_eventArgumentPrefix)) { return String.Empty; } else { if (_id == null) { return _eventArgumentPrefix + webPartID; } else { return _eventArgumentPrefix + _id + WebPartZoneBase.EventArgumentSeparator + webPartID; } } } protected virtual void LoadViewState(object savedState) { if (savedState != null) { ((IStateManager)ViewState).LoadViewState(savedState); // Cache value of Visible object b = ViewState["Visible"]; if (b != null) { _visible = (bool)b; } } } protected virtual object SaveViewState() { if (_viewState != null) { return ((IStateManager)_viewState).SaveViewState(); } return null; } // Only used by WebPartZoneBase for verbs rendered on a WebPart. internal void SetEventArgumentPrefix(string eventArgumentPrefix) { _eventArgumentPrefix = eventArgumentPrefix; } protected virtual void TrackViewState() { _isTrackingViewState = true; if (_viewState != null) { ((IStateManager)_viewState).TrackViewState(); } } #region Implementation of IStateManager ///bool IStateManager.IsTrackingViewState { get { return IsTrackingViewState; } } /// void IStateManager.LoadViewState(object savedState) { LoadViewState(savedState); } /// object IStateManager.SaveViewState() { return SaveViewState(); } /// void IStateManager.TrackViewState() { TrackViewState(); } #endregion } }
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