Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / HtmlControls / HtmlInputImage.cs / 1 / HtmlInputImage.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* * HtmlInputImage.cs * * Copyright (c) 2000 Microsoft Corporation */ namespace System.Web.UI.HtmlControls { using System; using System.Collections; using System.Collections.Specialized; using System.Globalization; using System.ComponentModel; using System.Web; using System.Web.UI; using System.Security.Permissions; ////// [ DefaultEvent("ServerClick"), SupportsEventValidation, ] [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class HtmlInputImage : HtmlInputControl, IPostBackDataHandler, IPostBackEventHandler { private static readonly object EventServerClick = new object(); private int _x; private int _y; /* * Creates an intrinsic Html INPUT type=image control. */ public HtmlInputImage() : base("image") { } ////// The ///class defines the /// methods, properties and events for the HtmlInputImage control. This class allows /// programmatic access to the HTML <input type= /// image> element on the server. /// /// /* * Align property. */ [ WebCategory("Appearance"), DefaultValue(""), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) ] public string Align { get { string s = Attributes["align"]; return((s != null) ? s : String.Empty); } set { Attributes["align"] = MapStringAttributeToString(value); } } ////// Gets or sets the image /// alignment within the form's content flow. /// ////// /* * Alt property. */ [ WebCategory("Appearance"), DefaultValue(""), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), Localizable(true) ] public string Alt { get { string s = Attributes["alt"]; return((s != null) ? s : String.Empty); } set { Attributes["alt"] = MapStringAttributeToString(value); } } ////// Gets or sets the alternative text /// that the browser should display if the image is either unavailable or has not /// been downloaded yet. /// ////// /* * Border property, size of border in pixels. */ [ WebCategory("Appearance"), DefaultValue(-1), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) ] public int Border { get { string s = Attributes["border"]; return((s != null) ? Int32.Parse(s, CultureInfo.InvariantCulture) : -1); } set { Attributes["border"] = MapIntegerAttributeToString(value); } } ////// Gets or sets the /// border width, in pixels, around the image. /// ////// /* * Src property. */ [ WebCategory("Appearance"), DefaultValue(""), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), UrlProperty() ] public string Src { get { string s = Attributes["src"]; return((s != null) ? s : String.Empty); } set { Attributes["src"] = MapStringAttributeToString(value); } } ////// Gets or sets the location of /// the image file relative to the page on which it is displayed. /// ////// [ WebCategory("Behavior"), DefaultValue(true), ] public virtual bool CausesValidation { get { object b = ViewState["CausesValidation"]; return((b == null) ? true : (bool)b); } set { ViewState["CausesValidation"] = value; } } [ WebCategory("Behavior"), DefaultValue(""), WebSysDescription(SR.PostBackControl_ValidationGroup) ] public virtual string ValidationGroup { get { string s = (string)ViewState["ValidationGroup"]; return((s == null) ? String.Empty : s); } set { ViewState["ValidationGroup"] = value; } } ///Gets or sets whether pressing the button causes page validation to fire. This defaults to True so that when /// using validation controls, the validation state of all controls are updated when the button is clicked, both /// on the client and the server. Setting this to False is useful when defining a cancel or reset button on a page /// that has validators. ////// [ WebCategory("Action"), WebSysDescription(SR.HtmlInputImage_OnServerClick) ] public event ImageClickEventHandler ServerClick { add { Events.AddHandler(EventServerClick, value); } remove { Events.RemoveHandler(EventServerClick, value); } } ////// Occurs on the server when a user clicks an ////// control. /// /// /// /* * This method is invoked just prior to rendering. * Register requires handling postback to determine if image has been clicked. */ protected internal override void OnPreRender(EventArgs e) { base.OnPreRender(e); if (Page != null) { if (!Disabled) Page.RegisterRequiresPostBack(this); if (CausesValidation) Page.RegisterPostBackScript(); } } ////// /* * Method used to raise the OnServerClick event. */ protected virtual void OnServerClick(ImageClickEventArgs e) { ImageClickEventHandler handler = (ImageClickEventHandler)Events[EventServerClick]; if (handler != null) handler(this, e); } ////// Raised on the server when a user clicks an ////// control. /// /// /// /* * Method of IPostBackEventHandler interface to raise events on post back. * HtmlInputImage fires an OnServerClick event. */ void IPostBackEventHandler.RaisePostBackEvent(string eventArgument) { RaisePostBackEvent(eventArgument); } ////// /// protected virtual void RaisePostBackEvent(string eventArgument) { if (CausesValidation) { Page.Validate(ValidationGroup); } OnServerClick(new ImageClickEventArgs(_x, _y)); } ////// /// /* * Method of IPostBackDataHandler interface to process posted data. * The image control will check to see if the x and y values were posted, * which indicates that the image was clicked by the user. The image * control will then register with the Page that it wants to raise an event * during the event processing phase. */ bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection) { return LoadPostData(postDataKey, postCollection); } protected virtual bool LoadPostData(string postDataKey, NameValueCollection postCollection) { string postX = postCollection[RenderedNameAttribute + ".x"]; string postY = postCollection[RenderedNameAttribute + ".y"]; if (postX != null && postY != null && postX.Length > 0 && postY.Length > 0) { ValidateEvent(UniqueID); _x = Int32.Parse(postX, CultureInfo.InvariantCulture); _y = Int32.Parse(postY, CultureInfo.InvariantCulture); Page.RegisterRequiresRaiseEvent(this); } return false; } ////// /// /* * Method of IPostBackDataHandler interface which is invoked whenever posted data * for a control has changed. */ void IPostBackDataHandler.RaisePostDataChangedEvent() { RaisePostDataChangedEvent(); } ////// /// protected virtual void RaisePostDataChangedEvent() { } /* * Override to render unique name attribute. * The name attribute is owned by the framework. */ ////// /// protected override void RenderAttributes(HtmlTextWriter writer) { PreProcessRelativeReferenceAttribute(writer, "src"); if (Page != null) { Util.WriteOnClickAttribute( writer, this, true, false, (CausesValidation && Page.GetValidators(ValidationGroup).Count > 0), ValidationGroup); } base.RenderAttributes(writer); } } }
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