issuelist.cs

使用C#语言开发的远程监控管理平台；使用soaphead对webservice进行加密的实例

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Resources;
using System.Windows.Forms;

namespace IssueVision
{
	// This is the IssueVision specific control that derives from the generic 
	// Outlook-like ExandableList control. Responsible for rendering the 
	// content of each row.
	public class IssueList : ExpandableList
	{
		// maps to the icons in the imagelist
		private enum RowStateIcon
		{
			Conflict = 0,
			Modified = 1
		}

		// cell space in each row
		private const int Buffer = 4;
		// where to draw the second column of information (from right side)
		private const int RightBuffer = 90;
		// don't draw the second column if the control is only this wide
		private const int DrawRightSideWidth = 200;
		// room for icon on the left side
		private const int LeftPos = 22;
		
		// gdi objects
		private StringFormat m_formatRight;
		private StringFormat m_formatEllipsis;
		
		private IssueSubject m_subject;
		private ImageList imageList;

		private IContainer components;

		public IssueSubject Subject
		{
			set
			{
				m_subject = value;
			}
		}

		public IssueList()
		{
			// right aligned text, setting the DirectionRightToLeft
			// works better then setting Alignment to StringAlignment.Far,
			// the latter approach does not always align the strings correctly
			m_formatRight = new StringFormat(StringFormatFlags.DirectionRightToLeft);
			
			// strings with ellipsis
			m_formatEllipsis = new StringFormat();
			m_formatEllipsis.FormatFlags = StringFormatFlags.NoWrap;
			m_formatEllipsis.Trimming = StringTrimming.EllipsisCharacter;
			
			InitializeComponent();
		}

		// a row needs to be painted
		protected override void OnDrawItem(DrawItemEventArgs e, DataRowView dr)
		{
			// colors that depend if the row is currently selected or not, 
			// assign to a system brush so should not be disposed
			// not selected colors
			Brush brushBack = SystemBrushes.Window;
			Brush brushText = SystemBrushes.WindowText;
			Brush brushDim = Brushes.Gray;
			
			if ((e.State & DrawItemState.Selected) != 0)
			{
				if ((e.State & DrawItemState.Focus) != 0)
				{
					//selected and has focus
					brushBack = SystemBrushes.Highlight;
					brushText = SystemBrushes.HighlightText;
					brushDim = SystemBrushes.HighlightText;
				}
				else
				{
					//selected and does not have focus
					brushBack = SystemBrushes.Control;
					brushDim = SystemBrushes.WindowText;
				}
			}
			
			//background
			e.Graphics.FillRectangle(brushBack, e.Bounds);
			
			//decrease the bounds to get a visual buffer around each row
			RectangleF rc = new RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height);
			rc.Inflate(-Buffer, -Buffer);
			
			//values
			DrawValues(e.Graphics, rc, brushText, brushDim, dr);
			
			//icon
			DrawIcon(e.Graphics, (int)rc.Left, (int)rc.Top, dr);
		}

		// draw content of a row
		private void DrawValues(Graphics g, RectangleF rc, Brush brushText, Brush brushDim, DataRowView dr)
		{
			// calculate the bounds of the title, necessary to 
			// draw ellipsis if string is too long
			RectangleF bounds = new RectangleF(rc.Left + LeftPos, rc.Top, rc.Width - LeftPos, Font.Height);
			
			//see if should leave room for the second column (date and username)
			if (rc.Width > DrawRightSideWidth)
			{
				bounds.Width -= RightBuffer;
			}
			
			//title
			g.DrawString((string)dr["Title"], Font, brushText, bounds, m_formatEllipsis);
			
			//comments
			bounds.Y += this.Font.Height + 2;
			g.DrawString((string)dr["Description"], Font, brushDim, bounds, m_formatEllipsis);
			
			//second column, date and open status
			if (rc.Width > DrawRightSideWidth)
			{
				//date
				g.DrawString(((DateTime)dr["DateOpened"]).ToShortDateString(), Font, brushDim, rc.Right, rc.Top, m_formatRight);
				
				//open / closed
				if ((bool)dr["IsOpen"])
				{
					g.DrawString("Open", Font, brushText, rc.Right, rc.Top + Font.Height + 2.0F, m_formatRight);
				}
				else
				{
					g.DrawString("Closed", Font, brushDim, rc.Right, rc.Top + Font.Height + 2.0F, m_formatRight);
				}
			}
		}

		// rows can have conflict, modified or no icon
		private void DrawIcon(Graphics g, int x, int y, DataRowView dr)
		{
			// conflict
			if (m_subject.ConflictItems != null && m_subject.ConflictItems.ContainsKey(dr["IssueID"]))
			{
				imageList.Draw(g, x, y, (int)RowStateIcon.Conflict);
				return;
			}
			
			// modified
			if (dr.Row.RowState == DataRowState.Modified || dr.Row.RowState == DataRowState.Added)
			{
				imageList.Draw(g, x, y, (int)RowStateIcon.Modified);
			}
		}

		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(IssueList));
			this.imageList = new System.Windows.Forms.ImageList(this.components);
			// 
			// imageList
			// 
			this.imageList.ColorDepth = System.Windows.Forms.ColorDepth.Depth32Bit;
			this.imageList.ImageSize = new System.Drawing.Size(16, 16);
			this.imageList.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("imageList.ImageStream")));
			this.imageList.TransparentColor = System.Drawing.Color.Lime;
			// 
			// IssueList
			// 
			this.Name = "IssueList";

		}

		protected override void Dispose(bool disposing)
		{
			if (disposing && components != null)
			{
				components.Dispose();
			}
			base.Dispose(disposing);
		}
	}
}