COM2ExtendedTypeConverter.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ComponentModel / COM2Interop / COM2ExtendedTypeConverter.cs / 1 / COM2ExtendedTypeConverter.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

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;
 
    /// 
    /// 
    /// Base class for value editors that extend basic functionality.
    /// calls will be delegated to the "base value editor". 
    /// 
    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;
         } 

 
        ///  
        /// 
        ///      Determines if this converter can convert an object in the given source 
        ///      type to the native type of the converter.
        /// 
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
            if (innerConverter != null) { 
               return innerConverter.CanConvertFrom(context, sourceType);
            } 
            return base.CanConvertFrom(context, sourceType); 
        }
 
        /// 
        /// 
        ///      Determines if this converter can convert an object to the given destination
        ///      type. 
        /// 
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { 
            if (innerConverter != null) { 
               return innerConverter.CanConvertTo(context, destinationType);
            } 
            return base.CanConvertTo(context, destinationType);
        }

        ///  
        /// 
        ///      Converts the given object to the converter's native type. 
        ///  
        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);
        } 

        ///  
        ///  
        ///      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.
        ///  
        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); 
        }

        /// 
        ///  
        ///      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. 
        /// 
        public override object CreateInstance(ITypeDescriptorContext context, IDictionary propertyValues) { 
            if (innerConverter != null) {
               return innerConverter.CreateInstance(context, propertyValues);
            }
            return base.CreateInstance(context, propertyValues); 
        }
 
        ///  
        /// 
        ///      Determines if changing a value on this object should require a call to 
        ///      CreateInstance to create a new value.
        /// 
        public override bool GetCreateInstanceSupported(ITypeDescriptorContext context) {
            if (innerConverter != null) { 
               return innerConverter.GetCreateInstanceSupported(context);
            } 
            return base.GetCreateInstanceSupported(context); 
        }
 
        /// 
        /// 
        ///      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.
        ///  
        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);
        }
 
        /// 
        ///  
        ///      Determines if this object supports properties.  By default, this 
        ///      is false.
        ///  
        public override bool GetPropertiesSupported(ITypeDescriptorContext context) {
            if (innerConverter != null) {
               return innerConverter.GetPropertiesSupported(context);
            } 
            return base.GetPropertiesSupported(context);
        } 
 
        /// 
        ///  
        ///      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. 
        /// 
        public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) { 
            if (innerConverter != null) { 
               return innerConverter.GetStandardValues(context);
            } 
            return base.GetStandardValues(context);
        }

        ///  
        /// 
        ///      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.
        /// 
        public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) { 
            if (innerConverter != null) {
               return innerConverter.GetStandardValuesExclusive(context); 
            } 
            return base.GetStandardValuesExclusive(context);
        } 

        /// 
        /// 
        ///      Determines if this object supports a standard set of values 
        ///      that can be picked from a list.
        ///  
        public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { 
            if (innerConverter != null) {
               return innerConverter.GetStandardValuesSupported(context); 
            }
            return base.GetStandardValuesSupported(context);
        }
 
        /// 
        ///  
        ///      Determines if the given object value is valid for this type. 
        /// 
        public override bool IsValid(ITypeDescriptorContext context, object value) { 
            if (innerConverter != null) {
               return innerConverter.IsValid(context, value);
            }
            return base.IsValid(context, value); 
        }
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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COM2ExtendedTypeConverter.cs source code in C# .NET

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