Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / Image.cs / 1305376 / Image.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; ////// [ DefaultProperty("ImageUrl"), Designer("System.Web.UI.Design.WebControls.PreviewControlDesigner, " + AssemblyRef.SystemDesign), ] 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. /// [ 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; } } public override bool SupportsDisabledAttribute { get { return RenderingCompatibility < VersionUtil.Framework40; } } // 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 && (RenderingCompatibility < VersionUtil.Framework40)) { 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. } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- IpcClientChannel.cs
- Button.cs
- FileAuthorizationModule.cs
- NavigationWindow.cs
- RestHandler.cs
- TableItemStyle.cs
- TextRangeEdit.cs
- QuaternionAnimation.cs
- ListSortDescription.cs
- ContentHostHelper.cs
- PathGeometry.cs
- TagPrefixCollection.cs
- ExportOptions.cs
- PersonalizationStateInfo.cs
- SapiGrammar.cs
- GraphicsPathIterator.cs
- TimelineCollection.cs
- WebPartConnectionsDisconnectVerb.cs
- ValueTypePropertyReference.cs
- ListViewItemEventArgs.cs
- DmlSqlGenerator.cs
- InputEventArgs.cs
- InterleavedZipPartStream.cs
- WindowsListViewGroupHelper.cs
- HierarchicalDataBoundControl.cs
- SapiInterop.cs
- Invariant.cs
- ListViewItem.cs
- SynchronizedDispatch.cs
- TabPageDesigner.cs
- Int16Animation.cs
- XmlReaderDelegator.cs
- Win32Exception.cs
- TimersDescriptionAttribute.cs
- DbDataAdapter.cs
- MsmqInputMessagePool.cs
- SpeechRecognizer.cs
- GridItem.cs
- Error.cs
- FusionWrap.cs
- RotateTransform3D.cs
- SHA1.cs
- OdbcError.cs
- ListViewInsertedEventArgs.cs
- MessageQueueTransaction.cs
- ExclusiveCanonicalizationTransform.cs
- FontStretch.cs
- StreamedWorkflowDefinitionContext.cs
- CodeAccessSecurityEngine.cs
- EpmCustomContentWriterNodeData.cs
- FileCodeGroup.cs
- ArrayWithOffset.cs
- StoreUtilities.cs
- FrameworkElement.cs
- Color.cs
- CompositeFontInfo.cs
- SerializationFieldInfo.cs
- VisualBasicSettingsHandler.cs
- TextChangedEventArgs.cs
- TaskFormBase.cs
- HtmlControlDesigner.cs
- EnvironmentPermission.cs
- AutomationElementIdentifiers.cs
- CompressStream.cs
- ClientFormsIdentity.cs
- XmlAnyAttributeAttribute.cs
- DecoderExceptionFallback.cs
- SqlConnectionPoolGroupProviderInfo.cs
- TemplateContainer.cs
- OutputCacheProfileCollection.cs
- Transform.cs
- StagingAreaInputItem.cs
- RectangleConverter.cs
- DataControlFieldCollection.cs
- Clipboard.cs
- XmlDataSourceNodeDescriptor.cs
- Formatter.cs
- XmlRawWriterWrapper.cs
- ADMembershipUser.cs
- SupportsEventValidationAttribute.cs
- PersonalizableAttribute.cs
- InputProcessorProfilesLoader.cs
- XhtmlConformanceSection.cs
- ProfileService.cs
- TCEAdapterGenerator.cs
- WebPartCatalogAddVerb.cs
- PeerUnsafeNativeMethods.cs
- ResolveInfo.cs
- ExecutionContext.cs
- Misc.cs
- RoleService.cs
- sqlnorm.cs
- CellRelation.cs
- MaskInputRejectedEventArgs.cs
- DbQueryCommandTree.cs
- TrayIconDesigner.cs
- XmlExceptionHelper.cs
- HttpModuleCollection.cs
- RSAPKCS1KeyExchangeDeformatter.cs
- QilSortKey.cs