widgetcollection.cs

一种.net实现ajax方法的类库

/** Copyright (c) 2006, All-In-One Creations, Ltd.
*  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.
*     * Neither the name of All-In-One Creations, Ltd. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
* 
* 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.
**/
/**
 * Project: emergetk: stateful web framework for the masses
 * File name: .cs
 * Description:
 *   
 * Author: Ben Joldersma
 *   
 */
using System;
using System.Collections;
using System.Collections.Generic;
using EmergeTk.Widgets.Html;

namespace EmergeTk
{
	/// <summary>
	/// Summary description for WidgetCollection.
	/// </summary>
	public class WidgetCollection : IEnumerable
	{
		private Dictionary<string,Widget> widgets;
		private List<Widget> ordered;

		public Widget this[ string key ]
		{
			get
			{
                if (!initialized){ initialize(); return null; }
                if (!widgets.ContainsKey(key))
                {
                    return null;
                }
				return widgets[ key ];
			}
			set
			{
                if (key == null)
                {
                    throw new System.ArgumentNullException("Key", "No valid Id for key.  Did you instantiate with Context.CreateWidget<>?  If not, you must explicitly set the widget's Id.");
                }
                Add(value);
			}
		}

        bool initialized = false;
        private void initialize()
        {
            ordered = new List<Widget>();
            widgets = new Dictionary<string, Widget>();
            initialized = true;
        }

		public Widget this[ int index ]
		{
			get
			{
                if (!initialized) { initialize(); return null; }
				return ordered[ index ] as Widget;
			}
			set
			{
                Add(value);
			}
		}

		public TextBox GetTextBox( string key )
		{
			return Find( key ) as TextBox;
		}

		public Label GetLabel( string key )
		{
			return Find( key ) as Label;
		}

		public Button GetButton( string key )
		{
			return Find( key ) as Button;
		}

		public int Count { get { return widgets.Count; } }
        
		public Widget Find( string key )
		{
			Widget theOne = null;
			foreach( Widget c in this )
			{
				if( c.Id == key || c.UID == key )
				{
					return c;
				}
				if( c.IsParent )
				{
					theOne = c.Widgets.Find( key );
					if( theOne != null )
					{
						return theOne;
					}
				}
			}
			return theOne;
		}

        public T Find<T>() where T : Widget
        {
            foreach( Widget c in this )
			{
				if( c is T )
				{
					return c as T;
				}
				if( c.IsParent )
				{
					T c2 = c.Widgets.Find<T>();
					if( c2 != null )
						return c2;
				}
			}
			return null;
        }

		public Widget Find( Type type )
		{
			foreach( Widget c in this )
			{
				if( c.GetType() == type )
				{
					return c;
				}
				if( c.IsParent )
				{
					Widget c2 = c.Widgets.Find( type );
					if( c2 != null )
						return c2;
				}
			}
			return null;
		}

		public void Remove( Widget c )
		{
			widgets.Remove(c.Id);
			ordered.Remove(c);
		}

		#region IEnumerable Members

		public IEnumerator GetEnumerator()
		{
            if (!initialized) initialize();
			return widgets.Values.GetEnumerator();
		}

		#endregion

		#region IList Members

		public bool IsReadOnly
		{
			get
			{
				// TODO:  Add WidgetCollection.IsReadOnly getter implementation
				return false;
			}
		}

		public void RemoveAt(int index)
		{
			widgets.Remove( ordered[ index ].id );
			ordered.RemoveAt( index );
		}

		public void Insert(int index, Widget value)
		{
            if (!initialized) initialize();
			widgets[ value.Id ] = value;
			ordered.Insert( index, value );
		}

		public bool Contains(Widget value)
		{
            if (!initialized) initialize();
			return widgets.ContainsValue( value );
		}

		public void Clear()
		{
            ordered.Clear();
			widgets.Clear();
		}

		public int IndexOf(Widget value)
		{
			return ordered.IndexOf( value );
		}

		public int Add(Widget value)
		{
            if (!initialized) initialize();
			widgets[ value.Id ] = value;
			ordered.Add( value );
            return ordered.Count - 1;
		}

		public bool IsFixedSize
		{
			get
			{
				// TODO:  Add WidgetCollection.IsFixedSize getter implementation
				return false;
			}
		}

		#endregion

	}
}