/*
 * Created by: Jarda Jirava
 * http://www.jirava.net
*/
using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;
using System.Diagnostics;

namespace JiravaNet.Windows.Forms
{
	/// <summary>
	/// Multi column Combo box. Displays information in various format from more than one datasource column/property
	/// </summary>
	public class MultiColumnComboBox: ComboBox
	{

		private string formatString;
		private string displayMember;

		public MultiColumnComboBox(): base()
		{			
			formatString = "{0}";
			displayMember = string.Empty;
		}

		protected override void OnDrawItem(DrawItemEventArgs e)
		{
			base.OnDrawItem (e);
			if ((e.Index < 0) || (e.Index >= Items.Count))
				return;
			if ((DisplayMember == null) || (DisplayMember.Length <= 0))
				return;

			string [] columns = this.DisplayMember.Split(',');
			object [] values = new object[columns.Length];
			string displayText = string.Empty;
			Brush brush = null;
			RectangleF layout = new RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height);

			for (int i=0; i<columns.Length; i++) 
			{
				values[i] = FilterItemOnProperty(Items[e.Index], columns[i]);
			}
			
			if (formatString != null)
				displayText = string.Format(formatString, values);
			else
				displayText = string.Format("{0}", values[0]);

			e.DrawBackground();
			switch (e.State) 
			{
				case DrawItemState.Selected | DrawItemState.Focus | DrawItemState.NoAccelerator | DrawItemState.NoFocusRect:
					brush = new SolidBrush(SystemColors.HighlightText);
					break;
				case DrawItemState.Selected | DrawItemState.NoAccelerator | DrawItemState.NoFocusRect:
					brush = new SolidBrush(SystemColors.HighlightText);
					break;
				case DrawItemState.NoAccelerator | DrawItemState.NoFocusRect:
					brush = new SolidBrush(ForeColor);
					break;
				default:
					brush = new SolidBrush(ForeColor);
					break;
			}
			e.Graphics.DrawString(displayText, Font, brush, layout);
			e.DrawFocusRectangle();
			brush.Dispose();
		}

		public new object DataSource 
		{
			get 
			{
				return base.DataSource;
			}
			set 
			{
				base.DataSource = value;
				if (value != null) 
				{
					this.DrawMode = DrawMode.OwnerDrawFixed;
				} 
				else 
				{
					this.DrawMode = DrawMode.Normal;
				}
			}
		}

		public new string DisplayMember 
		{
			get 
			{
				return this.displayMember;
			}
			set 
			{
				this.displayMember = value;
			}
		}

		[Editor(typeof(System.Windows.Forms.Design.PropertyTab), typeof(System.Drawing.Design.UITypeEditor))]
		[Category("Data"), Description("Display format"), DefaultValue("{0}")]
		public string FormatString 
		{
			get 
			{
				return formatString;
			}
			set 
			{
				formatString = value;
			}
		}

	}
}