Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / Image.cs / 1 / Image.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls { using System; using System.Collections; using System.ComponentModel; using System.Globalization; using System.Text; using System.Web; using System.Web.UI; using System.Drawing.Design; using System.Security.Permissions; ////// [ DefaultProperty("ImageUrl"), Designer("System.Web.UI.Design.WebControls.PreviewControlDesigner, " + AssemblyRef.SystemDesign), ] [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class Image : WebControl { private bool _urlResolved; ///Displays an image on a page. ////// public Image() : base(HtmlTextWriterTag.Img) { } ///Initializes a new instance of the ///class. /// [ #if ORCAS // Verification(guideline, checkpoint, VerificationReportLevel.Error, priority, message); Verification("WCAG", "1.1", VerificationReportLevel.Error, 1, SR.Accessibility_ImageAlternateTextMissing), Verification("ADA", "1194.22(a)", VerificationReportLevel.Error, 1, SR.Accessibility_ImageAlternateTextMissing), #endif Localizable(true), Bindable(true), WebCategory("Appearance"), DefaultValue(""), WebSysDescription(SR.Image_AlternateText) ] public virtual string AlternateText { get { string s = (string)ViewState["AlternateText"]; return((s == null) ? String.Empty : s); } set { ViewState["AlternateText"] = value; } } ///Specifies alternate text displayed when the image fails to load. ////// [ DefaultValue(""), Editor("System.Web.UI.Design.UrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), UrlProperty(), WebCategory("Accessibility"), WebSysDescription(SR.Image_DescriptionUrl) ] public virtual string DescriptionUrl { get { string s = (string)ViewState["DescriptionUrl"]; return((s == null) ? String.Empty : s); } set { ViewState["DescriptionUrl"] = value; } } ////// [ Browsable(false), EditorBrowsableAttribute(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), ] public override FontInfo Font { // Font is meaningless for image, so hide it from the developer by // making it non-browsable. get { return base.Font; } } [ Browsable(false), EditorBrowsableAttribute(EditorBrowsableState.Never) ] public override bool Enabled { get { return base.Enabled; } set { base.Enabled = value; } } [ DefaultValue(false), WebCategory("Accessibility"), WebSysDescription(SR.Image_GenerateEmptyAlternateText) ] public virtual bool GenerateEmptyAlternateText { get { object o = ViewState["GenerateEmptyAlternateText"]; return((o == null) ? false : (bool)o); } set { ViewState["GenerateEmptyAlternateText"] = value; } } ///Gets the font properties for the alternate text. This property is read-only. ////// [ WebCategory("Layout"), DefaultValue(ImageAlign.NotSet), WebSysDescription(SR.Image_ImageAlign) ] public virtual ImageAlign ImageAlign { get { object o = ViewState["ImageAlign"]; return((o == null) ? ImageAlign.NotSet : (ImageAlign)o); } set { if (value < ImageAlign.NotSet || value > ImageAlign.TextTop) { throw new ArgumentOutOfRangeException("value"); } ViewState["ImageAlign"] = value; } } ///Gets or /// sets the alignment of the image within the text flow. ////// [ Bindable(true), WebCategory("Appearance"), DefaultValue(""), Editor("System.Web.UI.Design.ImageUrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), UrlProperty(), WebSysDescription(SR.Image_ImageUrl) ] public virtual string ImageUrl { get { string s = (string)ViewState["ImageUrl"]; return((s == null) ? String.Empty : s); } set { ViewState["ImageUrl"] = value; } } // Perf work: Specially for AdRotator which uses the control while it // resolves the url on its own. internal bool UrlResolved { get { return _urlResolved; } set { _urlResolved = value; } } ///Gets or sets /// the URL reference to the image to display. ////// /// protected override void AddAttributesToRender(HtmlTextWriter writer) { base.AddAttributesToRender(writer); string s = ImageUrl; if (!UrlResolved) { s = ResolveClientUrl(s); } if (s.Length > 0 || !EnableLegacyRendering) { writer.AddAttribute(HtmlTextWriterAttribute.Src, s); } s = DescriptionUrl; if (s.Length != 0) { writer.AddAttribute(HtmlTextWriterAttribute.Longdesc, ResolveClientUrl(s)); } // always write out alt for accessibility purposes s = AlternateText; if (s.Length > 0 || GenerateEmptyAlternateText) { writer.AddAttribute(HtmlTextWriterAttribute.Alt,s); } ImageAlign align = ImageAlign; if (align != ImageAlign.NotSet) { string imageAlignValue; switch (align) { case ImageAlign.Left: imageAlignValue = "left"; break; case ImageAlign.Right: imageAlignValue = "right"; break; case ImageAlign.Baseline: imageAlignValue = "baseline"; break; case ImageAlign.Top: imageAlignValue = "top"; break; case ImageAlign.Middle: imageAlignValue = "middle"; break; case ImageAlign.Bottom: imageAlignValue = "bottom"; break; case ImageAlign.AbsBottom: imageAlignValue = "absbottom"; break; case ImageAlign.AbsMiddle: imageAlignValue = "absmiddle"; break; default: imageAlignValue = "texttop"; break; } writer.AddAttribute(HtmlTextWriterAttribute.Align, imageAlignValue); } if (BorderWidth.IsEmpty) { if (EnableLegacyRendering) { writer.AddAttribute(HtmlTextWriterAttribute.Border, "0", false); } else { writer.AddStyleAttribute(HtmlTextWriterStyle.BorderWidth, "0px"); } } } ///Adds the attributes of an ///to the output stream for rendering on /// the client. /// /// protected internal override void RenderContents(HtmlTextWriter writer) { // Do not render the children of a button since it does not // make sense to have children of an tag. } } }
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