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//------------------------------------------------------------------------------
// <copyright file="HtmlImage.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
/*
* HtmlImage.cs
*
* Copyright (c) 2000 Microsoft Corporation
*/
namespace System.Web.UI.HtmlControls {
using System;
using System.ComponentModel;
using System.Globalization;
using System.Web;
using System.Web.UI;
using System.Web.Util;
/// <devdoc>
/// <para>
/// The <see langword='HtmlImage'/>
/// class defines the methods, properties, and events
/// for the HtmlImage server control.
/// This class provides programmatic access on the server to
/// the HTML <img> element.
/// </para>
/// </devdoc>
[
ControlBuilderAttribute(typeof(HtmlEmptyTagControlBuilder))
]
public class HtmlImage : HtmlControl {
/*
* Creates an intrinsic Html IMG control.
*/
/// <devdoc>
/// <para>Initializes a new instance of the <see cref='System.Web.UI.HtmlControls.HtmlImage'/> class.</para>
/// </devdoc>
public HtmlImage() : base("img") {
}
/*
* Alt property
*/
/// <devdoc>
/// <para>
/// Gets or sets the alternative caption that the
/// browser displays if image is either unavailable or has not been downloaded yet.
/// </para>
/// </devdoc>
[
WebCategory("Appearance"),
Localizable(true),
DefaultValue(""),
DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
]
public string Alt {
get {
string s = Attributes["alt"];
return((s != null) ? s : String.Empty);
}
set {
// Dev11 #382229: <img> elements must have 'alt' attributes to pass W3 validation.
// An empty string is an acceptable default value for these attributes.
if (RenderingCompatibility >= VersionUtil.Framework45) {
Attributes["alt"] = value;
}
else {
Attributes["alt"] = MapStringAttributeToString(value);
}
}
}
/*
* Align property
*/
/// <devdoc>
/// <para>Gets or sets the alignment of the image with
/// surrounding text.</para>
/// </devdoc>
[
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);
}
}
/*
* Border property, size of border in pixels.
*/
/// <devdoc>
/// <para>
/// Gets or sets the width of image border, in pixels.
/// </para>
/// </devdoc>
[
WebCategory("Appearance"),
DefaultValue(0),
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);
}
}
/*
* Height property
*/
/// <devdoc>
/// <para>
/// Gets or sets
/// the height of the image. By default, this is expressed in
/// pixels,
/// but can be a expressed as a percentage.
/// </para>
/// </devdoc>
[
WebCategory("Layout"),
DefaultValue(100),
DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
]
public int Height {
get {
string s = Attributes["height"];
return((s != null) ? Int32.Parse(s, CultureInfo.InvariantCulture) : -1);
}
set {
Attributes["height"] = MapIntegerAttributeToString(value);
}
}
/*
* Src property.
*/
/// <devdoc>
/// <para>
/// Gets or sets the name of and path to the
/// image file to be displayed. This can be an absolute or
/// relative path.
/// </para>
/// </devdoc>
[
WebCategory("Behavior"),
DefaultValue(""),
DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
UrlProperty()
]
public string Src {
get {
string s = Attributes["src"];
return((s != null) ? s : String.Empty);
}
set {
Attributes["src"] = MapStringAttributeToString(value);
}
}
/*
* Width property
*/
/// <devdoc>
/// <para>
/// Gets or sets the width of the image. By default, this is
/// expressed in pixels,
/// but can be a expressed as a percentage.
/// </para>
/// </devdoc>
[
WebCategory("Layout"),
DefaultValue(100),
DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
]
public int Width {
get {
string s = Attributes["width"];
return((s != null) ? Int32.Parse(s, CultureInfo.InvariantCulture) : -1);
}
set {
Attributes["width"] = MapIntegerAttributeToString(value);
}
}
/*
* Override to render unique name attribute.
* The name attribute is owned by the framework.
*/
/// <internalonly/>
/// <devdoc>
/// </devdoc>
protected override void RenderAttributes(HtmlTextWriter writer) {
PreProcessRelativeReferenceAttribute(writer, "src");
base.RenderAttributes(writer);
writer.Write(" /");
}
}
}
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