datagridprioritycolumn.cs

一个用vs2003编写的客户工资管理系统客户端程序/一个用vs2003编写的客户工资管理系统客户端程序

using System;
using System.Collections;
using System.IO;
using System.Windows.Forms;
using System.Resources;
using System.Drawing;

namespace GzglClient.ColumnStyles
{
	public class DataGridPriorityColumn : System.Windows.Forms.DataGridTextBoxColumn
	{
		private Hashtable m_HtImages = new Hashtable();
		private const string c_PriorityImagesPath = @"Images\";
		private ResourceManager m_ResourceManager = 
			new ResourceManager("TaskVision.Localize", System.Reflection.Assembly.GetExecutingAssembly());

		public DataGridPriorityColumn(string headerText, string mappingName, int width)
		{
			base.HeaderText = headerText;
			base.MappingName = mappingName;
			base.Width = width;
		}

		protected override void Edit(System.Windows.Forms.CurrencyManager source,
			int rowNum, System.Drawing.Rectangle bounds, bool isReadOnly,
			string instantText, bool cellIsVisible)
		{
			// do nothing
		}

		protected override void Paint(System.Drawing.Graphics g, System.Drawing.Rectangle bounds,
			System.Windows.Forms.CurrencyManager source, int rowNum, System.Drawing.Brush backBrush,
			System.Drawing.Brush foreBrush, bool alignToRight)
		{
			object bVal = GetColumnValueAtRow(source, rowNum);

			Image imageToDraw=null;

			// we're caching the image in a hashtable
			if (m_HtImages.ContainsKey(bVal))
				imageToDraw = (Image) m_HtImages[bVal];
			else
			{
				// get the image from disk and cache it
				try
				{
					imageToDraw = Image.FromFile(c_PriorityImagesPath + (string) bVal + ".gif");
					m_HtImages.Add(bVal, imageToDraw);
				}
				catch
				{
					MessageBox.Show("图像：" + " " + 
						Application.StartupPath + @"\" + c_PriorityImagesPath +
						(string) bVal +
						"未找到！",	"文件无法找到");

				/*LogError.Write(m_ResourceManager.GetString("The_image_file") + " " + 
						Application.StartupPath + @"\" + c_PriorityImagesPath +
						(string) bVal + m_ResourceManager.GetString("gif_was_not_found"));
					return;  // Necessary in C# -- otherwise it won't compile
					// because imageToDraw is used below and might not be assigned.*/
				}
			}


			// if the current row is this row, draw the selection back color
			if (this.DataGridTableStyle.DataGrid.CurrentRowIndex == rowNum)
				g.FillRectangle(new SolidBrush(this.DataGridTableStyle.SelectionBackColor), bounds);
			else
				g.FillRectangle(backBrush, bounds);


			g.DrawImage(imageToDraw, new Point(bounds.X, bounds.Y));
		}
	}
}