// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
//
//
//
// Description: KeyGestureValueSerializer - Serializes a KeyGesture 
//              to and from a string
//
//
 
using System.ComponentModel;    // for TypeConverter
using System.Windows.Markup;
 
namespace System.Windows.Input
{
    /// <summary>
    /// KeyGestureValueSerializer - Converter class for serializing a KeyGesture
    /// </summary>
    public class KeyGestureValueSerializer : ValueSerializer
    {
        /// <summary>
        /// CanConvertFromString()
        /// </summary>
        /// <param name="value"></param>
        /// <param name="context"></param>
        /// <returns></returns>
        /// <ExternalAPI/> 
        public override bool CanConvertFromString(string value, IValueSerializerContext context) 
        {
            return true;
        }
 
        /// <summary>
        /// CanConvertToString()
        /// </summary>
        /// <param name="value"></param>
        /// <param name="context"></param>
        /// <returns></returns>
        /// <ExternalAPI/> 
        public override bool CanConvertToString(object value, IValueSerializerContext context) 
        {
            KeyGesture keyGesture = value as KeyGesture;
 
            return (keyGesture != null) 
                && ModifierKeysConverter.IsDefinedModifierKeys(keyGesture.Modifiers)
                && KeyGestureConverter.IsDefinedKey(keyGesture.Key);
        }
 
        /// <summary>
        /// ConvertFromString()
        /// </summary>
        /// <param name="value"></param>
        /// <param name="context"></param>
        /// <returns></returns>
        public override object ConvertFromString(string value, IValueSerializerContext context) 
        {
            TypeConverter converter = TypeDescriptor.GetConverter(typeof(KeyGesture));
            if (converter != null)
                return converter.ConvertFromString(value);
            else
                return base.ConvertFromString(value, context);
        }
 
        /// <summary>
        /// ConvertToString()
        /// </summary>
        /// <param name="value"></param>
        /// <param name="context"></param>
        /// <returns></returns>
        public override string ConvertToString(object value, IValueSerializerContext context) 
        {
            TypeConverter converter = TypeDescriptor.GetConverter(typeof(KeyGesture));
            if (converter != null)
                return converter.ConvertToInvariantString(value);
            else
                return base.ConvertToString(value, context);
        }
    }
}