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//------------------------------------------------------------------------------
// <copyright file="COM2ExtendedTypeConverter.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Windows.Forms.ComponentModel.Com2Interop {
using System.Diagnostics;
using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using Microsoft.Win32;
using System.Globalization;
using System.Collections;
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter"]/*' />
/// <devdoc>
/// Base class for value editors that extend basic functionality.
/// calls will be delegated to the "base value editor".
/// </devdoc>
internal class Com2ExtendedTypeConverter : TypeConverter {
private TypeConverter innerConverter;
public Com2ExtendedTypeConverter(TypeConverter innerConverter) {
this.innerConverter = innerConverter;
}
public Com2ExtendedTypeConverter(Type baseType) {
this.innerConverter = TypeDescriptor.GetConverter(baseType);
}
public TypeConverter InnerConverter {
get {
return innerConverter;
}
}
public TypeConverter GetWrappedConverter(Type t) {
TypeConverter converter = innerConverter;
while (converter != null) {
if (t.IsInstanceOfType(converter)) {
return converter;
}
if (converter is Com2ExtendedTypeConverter) {
converter = ((Com2ExtendedTypeConverter)converter).InnerConverter;
}
else {
break;
}
}
return null;
}
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter.CanConvertFrom"]/*' />
/// <devdoc>
/// Determines if this converter can convert an object in the given source
/// type to the native type of the converter.
/// </devdoc>
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
if (innerConverter != null) {
return innerConverter.CanConvertFrom(context, sourceType);
}
return base.CanConvertFrom(context, sourceType);
}
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter.CanConvertTo"]/*' />
/// <devdoc>
/// Determines if this converter can convert an object to the given destination
/// type.
/// </devdoc>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
if (innerConverter != null) {
return innerConverter.CanConvertTo(context, destinationType);
}
return base.CanConvertTo(context, destinationType);
}
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter.ConvertFrom"]/*' />
/// <devdoc>
/// Converts the given object to the converter's native type.
/// </devdoc>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
if (innerConverter != null) {
return innerConverter.ConvertFrom(context, culture, value);
}
return base.ConvertFrom(context, culture, value);
}
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter.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 (innerConverter != null) {
return innerConverter.ConvertTo(context, culture, value, destinationType);
}
return base.ConvertTo(context, culture, value, destinationType);
}
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter.CreateInstance"]/*' />
/// <devdoc>
/// Creates an instance of this type given a set of property values
/// for the object. This is useful for objects that are immutable, but still
/// want to provide changable properties.
/// </devdoc>
public override object CreateInstance(ITypeDescriptorContext context, IDictionary propertyValues) {
if (innerConverter != null) {
return innerConverter.CreateInstance(context, propertyValues);
}
return base.CreateInstance(context, propertyValues);
}
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter.GetCreateInstanceSupported"]/*' />
/// <devdoc>
/// Determines if changing a value on this object should require a call to
/// CreateInstance to create a new value.
/// </devdoc>
public override bool GetCreateInstanceSupported(ITypeDescriptorContext context) {
if (innerConverter != null) {
return innerConverter.GetCreateInstanceSupported(context);
}
return base.GetCreateInstanceSupported(context);
}
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter.GetProperties"]/*' />
/// <devdoc>
/// Retrieves the set of properties for this type. By default, a type has
/// does not return any properties. An easy implementation of this method
/// can just call TypeDescriptor.GetProperties for the correct data type.
/// </devdoc>
public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes) {
if (innerConverter != null) {
return innerConverter.GetProperties(context, value, attributes);
}
return base.GetProperties(context, value, attributes);
}
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter.GetPropertiesSupported"]/*' />
/// <devdoc>
/// Determines if this object supports properties. By default, this
/// is false.
/// </devdoc>
public override bool GetPropertiesSupported(ITypeDescriptorContext context) {
if (innerConverter != null) {
return innerConverter.GetPropertiesSupported(context);
}
return base.GetPropertiesSupported(context);
}
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter.GetStandardValues"]/*' />
/// <devdoc>
/// Retrieves a collection containing a set of standard values
/// for the data type this validator is designed for. This
/// will return null if the data type does not support a
/// standard set of values.
/// </devdoc>
public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) {
if (innerConverter != null) {
return innerConverter.GetStandardValues(context);
}
return base.GetStandardValues(context);
}
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter.GetStandardValuesExclusive"]/*' />
/// <devdoc>
/// Determines if the list of standard values returned from
/// GetStandardValues is an exclusive list. If the list
/// is exclusive, then no other values are valid, such as
/// in an enum data type. If the list is not exclusive,
/// then there are other valid values besides the list of
/// standard values GetStandardValues provides.
/// </devdoc>
public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) {
if (innerConverter != null) {
return innerConverter.GetStandardValuesExclusive(context);
}
return base.GetStandardValuesExclusive(context);
}
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter.GetStandardValuesSupported"]/*' />
/// <devdoc>
/// Determines if this object supports a standard set of values
/// that can be picked from a list.
/// </devdoc>
public override bool GetStandardValuesSupported(ITypeDescriptorContext context) {
if (innerConverter != null) {
return innerConverter.GetStandardValuesSupported(context);
}
return base.GetStandardValuesSupported(context);
}
/// <include file='doc\COM2ExtendedTypeConverter.uex' path='docs/doc[@for="Com2ExtendedTypeConverter.IsValid"]/*' />
/// <devdoc>
/// Determines if the given object value is valid for this type.
/// </devdoc>
public override bool IsValid(ITypeDescriptorContext context, object value) {
if (innerConverter != null) {
return innerConverter.IsValid(context, value);
}
return base.IsValid(context, value);
}
}
}
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