lyfz_repos/铂金版源码/LYFZ.PhotoSelectSystem/其它/XTable/Models/Design/RowCollectionEditor.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;

using XPTable.Events;
using XPTable.Models;


namespace XPTable.Models.Design
{
	/// <summary>
	/// Provides a user interface that can edit collections of Rows 
	/// at design time
	/// </summary>
	public class RowCollectionEditor : HelpfulCollectionEditor
	{
		/// <summary>
		///	The RowCollection being edited
		/// </summary>
		private RowCollection rows;

		
		/// <summary>
		/// Initializes a new instance of the RowCollectionEditor class 
		/// using the specified collection type
		/// </summary>
		/// <param name="type">The type of the collection for this editor to edit</param>
		public RowCollectionEditor(Type type) : base(type)
		{
			this.rows = null;
		}


		/// <summary>
		/// Edits the value of the specified object using the specified 
		/// service provider and context
		/// </summary>
		/// <param name="context">An ITypeDescriptorContext that can be 
		/// used to gain additional context information</param>
		/// <param name="isp">A service provider object through which 
		/// editing services can be obtained</param>
		/// <param name="value">The object to edit the value of</param>
		/// <returns>The new value of the object. If the value of the 
		/// object has not changed, this should return the same object 
		/// it was passed</returns>
		public override object EditValue(ITypeDescriptorContext context, IServiceProvider isp, object value)
		{
			this.rows = (RowCollection) value;

			object returnObject = base.EditValue(context, isp, value);

			TableModel model = (TableModel) context.Instance;

			// make sure the TableModel's Table redraws any additions/deletions
			if (model.Table != null)
			{
				model.Table.PerformLayout();
				model.Table.Refresh();
			}

			return returnObject;
		}


		/// <summary>
		/// Creates a new instance of the specified collection item type
		/// </summary>
		/// <param name="itemType">The type of item to create</param>
		/// <returns>A new instance of the specified object</returns>
		protected override object CreateInstance(Type itemType)
		{
			Row row = (Row) base.CreateInstance(itemType);

			// newly created items aren't added to the collection 
			// until editing has finished.  we'd like the newly 
			// created row to show up in the table immediately
			// so we'll add it to the RowCollection now
			this.rows.Add(row);
			
			return row;
		}


		/// <summary>
		/// Destroys the specified instance of the object
		/// </summary>
		/// <param name="instance">The object to destroy</param>
		protected override void DestroyInstance(object instance)
		{
			if (instance != null && instance is Row)
			{
				Row row = (Row) instance;

				// the specified row is about to be destroyed so 
				// we need to remove it from the RowCollection first
				this.rows.Remove(row);
			}
			
			base.DestroyInstance(instance);
		}
	}
}