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//------------------------------------------------------------------------------
// <copyright file="ThemeableAttribute.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
/*
*/
namespace System.Web.UI {
using System;
using System.Collections;
using System.ComponentModel;
/// <devdoc>
/// <para></para>
/// </devdoc>
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Class)]
public sealed class ThemeableAttribute : Attribute {
/// <internalonly/>
/// <devdoc>
/// <para></para>
/// </devdoc>
public static readonly ThemeableAttribute Yes = new ThemeableAttribute(true);
/// <internalonly/>
/// <devdoc>
/// <para></para>
/// </devdoc>
public static readonly ThemeableAttribute No = new ThemeableAttribute(false);
/// <internalonly/>
/// <devdoc>
/// <para></para>
/// </devdoc>
public static readonly ThemeableAttribute Default = Yes;
private bool _themeable = false;
private static Hashtable _themeableTypes;
static ThemeableAttribute() {
// Create a synchronized wrapper
_themeableTypes = Hashtable.Synchronized(new Hashtable());
}
/// <devdoc>
/// </devdoc>
public ThemeableAttribute(bool themeable) {
_themeable = themeable;
}
/// <devdoc>
/// <para> Indicates if the property is themeable.</para>
/// </devdoc>
public bool Themeable {
get {
return _themeable;
}
}
/// <internalonly/>
public override bool Equals(object obj) {
if (obj == this) {
return true;
}
ThemeableAttribute other = obj as ThemeableAttribute;
return (other != null) && (other.Themeable == _themeable);
}
/// <internalonly/>
public override int GetHashCode() {
return _themeable.GetHashCode();
}
/// <internalonly/>
public override bool IsDefaultAttribute() {
return this.Equals(Default);
}
public static bool IsObjectThemeable(Object instance) {
if (instance == null)
throw new ArgumentNullException("instance");
return IsTypeThemeable(instance.GetType());
}
public static bool IsTypeThemeable(Type type) {
if (type == null)
throw new ArgumentNullException("type");
object result = _themeableTypes[type];
if (result != null) {
return (bool)result;
}
//System.ComponentModel.AttributeCollection attrs = TypeDescriptor.GetAttributes(type);
//ThemeableAttribute attr = (ThemeableAttribute)attrs[typeof(ThemeableAttribute)];
ThemeableAttribute attr = Attribute.GetCustomAttribute(type, typeof(ThemeableAttribute)) as ThemeableAttribute;
result = (attr != null) && attr.Themeable;
_themeableTypes[type] = result;
return (bool)result;
}
}
}
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