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//------------------------------------------------------------------------------
// <copyright file="ColumnHeaderConverter.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
/*
*/
namespace System.Windows.Forms {
using System.Runtime.Serialization.Formatters;
using System.Runtime.Remoting;
using System.Runtime.InteropServices;
using Microsoft.Win32;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Drawing;
using System.Diagnostics;
using System.Globalization;
using System.Reflection;
/// <include file='doc\ColumnHeaderConverter.uex' path='docs/doc[@for="ColumnHeaderConverter"]/*' />
/// <devdoc>
/// </devdoc>
public class ColumnHeaderConverter : ExpandableObjectConverter {
/// <include file='doc\ColumnHeaderConverter.uex' path='docs/doc[@for="ColumnHeaderConverter.CanConvertTo"]/*' />
/// <devdoc>
/// <para>Gets a value indicating whether this converter can
/// convert an object to the given destination type using the context.</para>
/// </devdoc>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
if (destinationType == typeof(InstanceDescriptor)) {
return true;
}
return base.CanConvertTo(context, destinationType);
}
/// <include file='doc\ColumnHeaderConverter.uex' path='docs/doc[@for="ColumnHeaderConverter.ConvertTo"]/*' />
/// <devdoc>
/// Converts the given object to another type. The most common types to convert
/// are to and from a string object. The default implementation will make a call
/// to ToString on the object if the object is valid and if the destination
/// type is string. If this cannot convert to the desitnation type, this will
/// throw a NotSupportedException.
/// </devdoc>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
if (destinationType == null) {
throw new ArgumentNullException("destinationType");
}
if (destinationType == typeof(InstanceDescriptor) && value is ColumnHeader) {
ColumnHeader col = (ColumnHeader) value;
ConstructorInfo ctor;
Type t = TypeDescriptor.GetReflectionType(value);
InstanceDescriptor id = null;
if (col.ImageIndex != -1) {
ctor = t.GetConstructor(new Type[]{typeof(int)});
if (ctor != null) {
id = new InstanceDescriptor(ctor, new object[]{col.ImageIndex}, false);
}
}
if (id == null && !String.IsNullOrEmpty(col.ImageKey)) {
ctor = t.GetConstructor(new Type[]{typeof(string)});
if (ctor != null) {
id = new InstanceDescriptor(ctor, new object[]{col.ImageKey}, false);
}
}
if (id == null) {
ctor = t.GetConstructor(new Type[0]);
if (ctor != null) {
return new InstanceDescriptor(ctor, new object[0], false);
}
else {
throw new ArgumentException(SR.GetString(SR.NoDefaultConstructor, t.FullName));
}
}
return id;
}
return base.ConvertTo(context, culture, value, destinationType);
}
}
}
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