lyfz_repos/铂金版源码/LYFZ.PhotoSelectSystem/其它/XTable/Models/Design/CellConverter.cs

/*
 * Copyright © 2005, Mathew Hall
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 *
 *    - Redistributions of source code must retain the above copyright notice, 
 *      this list of conditions and the following disclaimer.
 * 
 *    - Redistributions in binary form must reproduce the above copyright notice, 
 *      this list of conditions and the following disclaimer in the documentation 
 *      and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
 * OF SUCH DAMAGE.
 */


using System;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Drawing;
using System.Globalization;
using System.Reflection;

using XPTable.Models;


namespace XPTable.Models.Design
{
	/// <summary>
	/// A custom TypeConverter used to help convert Cells from 
	/// one Type to another
	/// </summary>
	public class CellConverter : TypeConverter
	{
		/// <summary>
		/// Returns whether this converter can convert the object to the 
		/// specified type, using the specified context
		/// </summary>
		/// <param name="context">An ITypeDescriptorContext that provides a 
		/// format context</param>
		/// <param name="destinationType">A Type that represents the type 
		/// you want to convert to</param>
		/// <returns>true if this converter can perform the conversion; o
		/// therwise, false</returns>
		public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
		{
			if (destinationType == typeof(InstanceDescriptor))
			{
				return true;
			}

			return base.CanConvertTo(context, destinationType);
		}


		/// <summary>
		/// Converts the given value object to the specified type, using 
		/// the specified context and culture information
		/// </summary>
		/// <param name="context">An ITypeDescriptorContext that provides 
		/// a format context</param>
		/// <param name="culture">A CultureInfo object. If a null reference 
		/// is passed, the current culture is assumed</param>
		/// <param name="value">The Object to convert</param>
		/// <param name="destinationType">The Type to convert the value 
		/// parameter to</param>
		/// <returns>An Object that represents the converted value</returns>
		public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
		{
			if (destinationType == typeof(InstanceDescriptor) && value is Cell)
			{
				ConstructorInfo ci = typeof(Cell).GetConstructor(new Type[] {});

				if (ci != null)
				{
					return new InstanceDescriptor(ci, null, false);
				}
			}

			return base.ConvertTo(context, culture, value, destinationType);
		}
	}
}