colobserver.cs

c#设计模式随书源码 c#设计模式随书源码

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

namespace Observer
{
	/// <summary>
	/// Summary description for ColObserver.
	/// </summary>
	public class ColObserver : System.Windows.Forms.Form, Observer 	{
		private System.ComponentModel.Container components = null;
		private Brush bBrush;
		private System.Windows.Forms.PictureBox pic;
		private Font fnt;
		private Hashtable colors;
		private string colName;
		//-----
		public ColObserver(Subject subj) 		{
			InitializeComponent();
			init(subj);
		}
		//-----
		private void init(Subject subj) {
			subj.registerInterest (this);
			fnt = new Font("arial", 18, FontStyle.Bold);
			bBrush = new SolidBrush(Color.Black);
			pic.Paint+= new PaintEventHandler (paintHandler);
			colors = new Hashtable ();
			colors.Add("red", Color.Red );
			colors.Add ("blue", Color.Blue );
			colors.Add ("green", Color.Green );
			colName = "";
		}
		//-----
		public void sendNotify(string message) {
			colName = message;
			message = message.ToLower ();
			Color col = (Color)colors[message];
			pic.BackColor = col;
		}
		//-----
		private void paintHandler(object sender, PaintEventArgs e) {
			 Graphics g = e.Graphics ;
			 g.DrawString(colName, fnt, bBrush, 20, 40);
		}
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.pic = new System.Windows.Forms.PictureBox();
			this.SuspendLayout();
			// 
			// pic
			// 
			this.pic.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
			this.pic.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
			this.pic.Location = new System.Drawing.Point(24, 24);
			this.pic.Name = "pic";
			this.pic.Size = new System.Drawing.Size(184, 152);
			this.pic.TabIndex = 0;
			this.pic.TabStop = false;
			// 
			// ColObserver
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(248, 213);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.pic});
			this.Name = "ColObserver";
			this.Text = "Color observer";
			this.ResumeLayout(false);

		}
		#endregion
	}
}