Code:
/ FX-1434 / FX-1434 / 1.0 / 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. } } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- VisualTreeUtils.cs
- nulltextcontainer.cs
- PrintPageEvent.cs
- PlanCompilerUtil.cs
- DataControlFieldCell.cs
- LoginStatusDesigner.cs
- CodeVariableDeclarationStatement.cs
- DoubleKeyFrameCollection.cs
- DataServiceRequestOfT.cs
- RowUpdatingEventArgs.cs
- ObjectCloneHelper.cs
- DrawingCollection.cs
- XmlUtil.cs
- CompileLiteralTextParser.cs
- PropertyTab.cs
- FixedSOMElement.cs
- ISAPIWorkerRequest.cs
- MetaType.cs
- AjaxFrameworkAssemblyAttribute.cs
- XmlQualifiedNameTest.cs
- FocusWithinProperty.cs
- Paragraph.cs
- PermissionToken.cs
- WebPartChrome.cs
- GeneratedView.cs
- TraceHandlerErrorFormatter.cs
- BoundColumn.cs
- XmlEncoding.cs
- PointUtil.cs
- KnownTypes.cs
- CodeDelegateCreateExpression.cs
- ProcessInfo.cs
- _LocalDataStore.cs
- EmptyEnumerator.cs
- InputManager.cs
- WeakReferenceList.cs
- RowType.cs
- HybridWebProxyFinder.cs
- XmlQueryStaticData.cs
- GraphicsContext.cs
- TextParaClient.cs
- ComponentRenameEvent.cs
- WebBrowser.cs
- BaseUriHelper.cs
- XmlText.cs
- ServiceDiscoveryElement.cs
- EntityCollection.cs
- HwndSourceParameters.cs
- COM2EnumConverter.cs
- InternalControlCollection.cs
- x509utils.cs
- ParseChildrenAsPropertiesAttribute.cs
- HandledMouseEvent.cs
- AutoSizeToolBoxItem.cs
- StringStorage.cs
- HtmlContainerControl.cs
- GZipDecoder.cs
- baseaxisquery.cs
- OutOfMemoryException.cs
- GetLedgerEntryForRecipientRequest.cs
- LiteralControl.cs
- _SecureChannel.cs
- QueryOperationResponseOfT.cs
- FileDialog_Vista.cs
- ProfilePropertySettingsCollection.cs
- Activation.cs
- Selection.cs
- SweepDirectionValidation.cs
- DictionaryEntry.cs
- coordinator.cs
- SortAction.cs
- TypeInitializationException.cs
- RandomNumberGenerator.cs
- BlobPersonalizationState.cs
- ConfigXmlAttribute.cs
- StringAttributeCollection.cs
- Simplifier.cs
- ISessionStateStore.cs
- cache.cs
- Rotation3D.cs
- TableProvider.cs
- VScrollBar.cs
- MemoryFailPoint.cs
- CryptoHandle.cs
- CodeExporter.cs
- SiteMap.cs
- IUnknownConstantAttribute.cs
- XmlSchemaExporter.cs
- UInt64Storage.cs
- PublisherIdentityPermission.cs
- StringSorter.cs
- BoolExpressionVisitors.cs
- GeneralTransform.cs
- XmlComment.cs
- DataGridBoolColumn.cs
- BuildDependencySet.cs
- TextEffect.cs
- TaskbarItemInfo.cs
- EntityTypeEmitter.cs
- Interlocked.cs