Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / HyperLink.cs / 1305376 / HyperLink.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls { using System; using System.ComponentModel; using System.Drawing.Design; using System.Web; using System.Web.UI; using System.Web.Util; ////// public class HyperLinkControlBuilder : ControlBuilder { ///Interacts with the parser to build a ///. /// public override bool AllowWhitespaceLiterals() { return false; } } ///Gets a value to indicate whether or not white spaces are allowed in literals for this control. This /// property is read-only. ////// [ ControlBuilderAttribute(typeof(HyperLinkControlBuilder)), DataBindingHandler("System.Web.UI.Design.HyperLinkDataBindingHandler, " + AssemblyRef.SystemDesign), DefaultProperty("Text"), Designer("System.Web.UI.Design.WebControls.HyperLinkDesigner, " + AssemblyRef.SystemDesign), ToolboxData("<{0}:HyperLink runat=\"server\">HyperLink{0}:HyperLink>"), ParseChildren(false) ] public class HyperLink : WebControl { private bool _textSetByAddParsedSubObject = false; ///Creates a link for the browser to navigate to another page. ////// public HyperLink() : base(HtmlTextWriterTag.A) { } ///Initializes a new instance of the ///class. /// [ Bindable(true), WebCategory("Appearance"), DefaultValue(""), Editor("System.Web.UI.Design.ImageUrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), UrlProperty(), WebSysDescription(SR.HyperLink_ImageUrl) ] public virtual string ImageUrl { get { string s = (string)ViewState["ImageUrl"]; return((s == null) ? String.Empty : s); } set { ViewState["ImageUrl"] = value; } } ///Gets or sets the URL reference to an image to display as an alternative to plain text for the /// hyperlink. ////// [ Bindable(true), WebCategory("Navigation"), DefaultValue(""), Editor("System.Web.UI.Design.UrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), UrlProperty(), WebSysDescription(SR.HyperLink_NavigateUrl) ] public string NavigateUrl { get { string s = (string)ViewState["NavigateUrl"]; return((s == null) ? String.Empty : s); } set { ViewState["NavigateUrl"] = value; } } public override bool SupportsDisabledAttribute { get { return RenderingCompatibility < VersionUtil.Framework40; } } internal override bool RequiresLegacyRendering { get { return true; } } ///Gets or sets the URL reference to navigate to when the hyperlink is clicked. ////// [ WebCategory("Navigation"), DefaultValue(""), WebSysDescription(SR.HyperLink_Target), TypeConverter(typeof(TargetConverter)) ] public string Target { get { string s = (string)ViewState["Target"]; return((s == null) ? String.Empty : s); } set { ViewState["Target"] = value; } } ///Gets or sets the target window or frame the contents of /// the ///will be displayed into when clicked. /// [ Localizable(true), Bindable(true), WebCategory("Appearance"), DefaultValue(""), WebSysDescription(SR.HyperLink_Text), PersistenceMode(PersistenceMode.InnerDefaultProperty) ] public virtual string Text { get { object o = ViewState["Text"]; return((o == null) ? String.Empty : (string)o); } set { if (HasControls()) { Controls.Clear(); } ViewState["Text"] = value; } } ////// Gets or sets the text displayed for the ///. /// /// protected override void AddAttributesToRender(HtmlTextWriter writer) { if (Enabled && !IsEnabled && SupportsDisabledAttribute) { // We need to do the cascade effect on the server, because the browser // only renders as disabled, but doesn't disable the functionality. writer.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled"); } base.AddAttributesToRender(writer); string s = NavigateUrl; if ((s.Length > 0) && IsEnabled) { string resolvedUrl = ResolveClientUrl(s); writer.AddAttribute(HtmlTextWriterAttribute.Href, resolvedUrl); } s = Target; if (s.Length > 0) { writer.AddAttribute(HtmlTextWriterAttribute.Target, s); } } protected override void AddParsedSubObject(object obj) { if (HasControls()) { base.AddParsedSubObject(obj); } else { if (obj is LiteralControl) { if (_textSetByAddParsedSubObject) { Text += ((LiteralControl)obj).Text; } else { Text = ((LiteralControl)obj).Text; } _textSetByAddParsedSubObject = true; } else { string currentText = Text; if (currentText.Length != 0) { //Text was set to String.Empty, which cause clearing all child controls when LoadViewState(DevDiv Bugs 159505) Text = null; base.AddParsedSubObject(new LiteralControl(currentText)); } base.AddParsedSubObject(obj); } } } ///Adds the attribututes of the a ///to the output /// stream for rendering. /// /// Load previously saved state. /// Overridden to synchronize Text property with LiteralContent. /// protected override void LoadViewState(object savedState) { if (savedState != null) { base.LoadViewState(savedState); string s = (string)ViewState["Text"]; // Dev10 703061 If Text is set, we want to clear out any child controls, but not dirty viewstate if (s != null && HasControls()) { Controls.Clear(); } } } ////// /// protected internal override void RenderContents(HtmlTextWriter writer) { string s = ImageUrl; if (s.Length > 0) { Image img = new Image(); // NOTE: The Url resolution happens right here, because the image is not parented // and will not be able to resolve when it tries to do so. img.ImageUrl = ResolveClientUrl(s); img.UrlResolved = true; img.GenerateEmptyAlternateText = true; s = ToolTip; if (s.Length != 0) { img.ToolTip = s; } s = Text; if (s.Length != 0) { img.AlternateText = s; } img.RenderControl(writer); } else { if (HasRenderingData()) { base.RenderContents(writer); } else { writer.Write(Text); } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.Displays the ///on a page.
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