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//------------------------------------------------------------------------------
// <copyright file="FontUnitConverter.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.WebControls {
using System;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Globalization;
using System.Reflection;
using System.Web.Util;
/// <devdoc>
/// <para>Converts a <see cref='System.Web.UI.WebControls.FontUnit'/> to and from a specified data type.</para>
/// </devdoc>
public class FontUnitConverter : TypeConverter {
private StandardValuesCollection values;
/// <devdoc>
/// <para>Determines if the specified data type can be converted to a <see cref='System.Web.UI.WebControls.FontUnit'/>.</para>
/// </devdoc>
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
if (sourceType == typeof(string)) {
return true;
}
else {
return base.CanConvertFrom(context, sourceType);
}
}
/// <devdoc>
/// <para>Converts the specified <see cref='System.Object' qualify='true'/> into a <see cref='System.Web.UI.WebControls.FontUnit'/>.</para>
/// </devdoc>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
if (value == null)
return null;
string stringValue = value as string;
if (stringValue != null) {
string textValue = stringValue.Trim();
if (textValue.Length == 0) {
return FontUnit.Empty;
}
return FontUnit.Parse(textValue, culture);
}
else {
return base.ConvertFrom(context, culture, value);
}
}
/// <internalonly/>
/// <devdoc>
/// Returns a value indicating whether the converter can
/// convert to the specified destination type.
/// </devdoc>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
if ((destinationType == typeof(string)) ||
(destinationType == typeof(InstanceDescriptor))) {
return true;
}
else {
return base.CanConvertTo(context, destinationType);
}
}
/// <devdoc>
/// <para>Converts the specified <see cref='System.Web.UI.WebControls.FontUnit'/> into the specified <see cref='System.Type' qualify='true'/>. </para>
/// </devdoc>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
if (destinationType == typeof(string)) {
if ((value == null) || (((FontUnit)value).Type == FontSize.NotSet))
return String.Empty;
else
return ((FontUnit)value).ToString(culture);
}
else if ((destinationType == typeof(InstanceDescriptor)) && (value != null)) {
FontUnit u = (FontUnit)value;
MemberInfo member = null;
object[] args = null;
if (u.IsEmpty) {
member = typeof(FontUnit).GetField("Empty");
}
else if (u.Type != FontSize.AsUnit) {
string fieldName = null;
switch (u.Type) {
case FontSize.Smaller:
fieldName = "Smaller";
break;
case FontSize.Larger:
fieldName = "Larger";
break;
case FontSize.XXSmall:
fieldName = "XXSmall";
break;
case FontSize.XSmall:
fieldName = "XSmall";
break;
case FontSize.Small:
fieldName = "Small";
break;
case FontSize.Medium:
fieldName = "Medium";
break;
case FontSize.Large:
fieldName = "Large";
break;
case FontSize.XLarge:
fieldName = "XLarge";
break;
case FontSize.XXLarge:
fieldName = "XXLarge";
break;
}
Debug.Assert(fieldName != null, "Invalid FontSize type");
if (fieldName != null) {
member = typeof(FontUnit).GetField(fieldName);
}
}
else {
member = typeof(FontUnit).GetConstructor(new Type[] { typeof(Unit) });
args = new object[] { u.Unit };
}
Debug.Assert(member != null, "Looks like we're missing FontUnit static fields or FontUnit::ctor(Unit)");
if (member != null) {
return new InstanceDescriptor(member, args);
}
else {
return null;
}
}
else {
return base.ConvertTo(context, culture, value, destinationType);
}
}
/// <devdoc>
/// <para>Returns a <see cref='System.ComponentModel.TypeConverter.StandardValuesCollection' qualify='true'/>
/// containing standard <see cref='System.Web.UI.WebControls.FontUnit'/> values.</para>
/// </devdoc>
public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) {
if (values == null) {
object[] namedUnits = new object[] {
FontUnit.Smaller,
FontUnit.Larger,
FontUnit.XXSmall,
FontUnit.XSmall,
FontUnit.Small,
FontUnit.Medium,
FontUnit.Large,
FontUnit.XLarge,
FontUnit.XXLarge
};
values = new StandardValuesCollection(namedUnits);
}
return values;
}
/// <devdoc>
/// <para>Indicates whether the specified context contains exclusive standard
/// values.</para>
/// </devdoc>
public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) {
return false;
}
/// <devdoc>
/// <para>Indicates whether the specified context contains suppurted standard
/// values.</para>
/// </devdoc>
public override bool GetStandardValuesSupported(ITypeDescriptorContext context) {
return true;
}
}
}
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