观察者模式,越详细越好.200分送上.大家看分的份上啊。
观察者模式,越详细越好.200分送上.大家看分的份上啊。
[解决办法]
//Subject.cs
using System;
namespace Observer
{
/// <summary>
/// Summary description for Subject.
/// </summary>
public interface Subject {
void registerInterest(Observer obs);
}
}
//ListObs.cs
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
namespace Observer
{
/// <summary>
/// Summary description for ListObs.
/// </summary>
public class ListObs : System.Windows.Forms.Form, Observer
{
private System.Windows.Forms.ListBox lsColors;
/// <summary>
/// Adds text of color to list box
/// </summary>
private System.ComponentModel.Container components = null;
public ListObs(Subject subj) {
InitializeComponent();
init(subj);
}
//------
public void init(Subject subj) {
subj.registerInterest (this);
}
//------
public void sendNotify(string message){
lsColors.Items.Add(message);
}
/// <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.lsColors = new System.Windows.Forms.ListBox();
this.SuspendLayout();
//
// lsColors
//
this.lsColors.Location = new System.Drawing.Point(16, 16);
this.lsColors.Name = "lsColors";
this.lsColors.Size = new System.Drawing.Size(216, 173);
this.lsColors.TabIndex = 0;
//
// ListObs
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(264, 213);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.lsColors});
this.Name = "ListObs";
this.Text = "List observer";
this.ResumeLayout(false);
}
#endregion
}
}
//Observer.cs
using System;
namespace Observer
{
/// <summary>
/// Summary description for Observer.
/// </summary>
public interface Observer {
void sendNotify(string message);
}
}
//ColObserver.cs
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
}
}
//Form1.cs
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace Observer
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form, Subject
{
private System.Windows.Forms.GroupBox groupBox1;
private System.Windows.Forms.RadioButton opRed;
private System.Windows.Forms.RadioButton opGreen;
private System.Windows.Forms.RadioButton opBlue;
private ArrayList observers;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public Form1()
{
InitializeComponent();
init();
}
private void init() {
EventHandler evh = new EventHandler (opButton_Click);
opRed.Click += evh;
opBlue.Click += evh;
opGreen.Click += evh;
observers = new ArrayList ();
ListObs lobs = new ListObs (this);
lobs.Show ();
ColObserver colObs = new ColObserver (this);
colObs.Show();
}
public void registerInterest(Observer obs ) {
observers.Add (obs);
}
/// <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.groupBox1 = new System.Windows.Forms.GroupBox();
this.opRed = new System.Windows.Forms.RadioButton();
this.opGreen = new System.Windows.Forms.RadioButton();
this.opBlue = new System.Windows.Forms.RadioButton();
this.groupBox1.SuspendLayout();
this.SuspendLayout();
//
// groupBox1
//
this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
this.opBlue,
this.opGreen,
this.opRed});
this.groupBox1.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.groupBox1.Location = new System.Drawing.Point(32, 24);
this.groupBox1.Name = "groupBox1";
this.groupBox1.Size = new System.Drawing.Size(160, 144);
this.groupBox1.TabIndex = 0;
this.groupBox1.TabStop = false;
this.groupBox1.Text = "Select colors";
//
// opRed
//
this.opRed.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.opRed.ForeColor = System.Drawing.Color.Red;
this.opRed.Location = new System.Drawing.Point(32, 32);
this.opRed.Name = "opRed";
this.opRed.TabIndex = 0;
this.opRed.Text = "Red";
//
// opGreen
//
this.opGreen.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.opGreen.ForeColor = System.Drawing.Color.FromArgb(((System.Byte)(0)), ((System.Byte)(192)), ((System.Byte)(0)));
this.opGreen.Location = new System.Drawing.Point(32, 64);
this.opGreen.Name = "opGreen";
this.opGreen.Size = new System.Drawing.Size(96, 16);
this.opGreen.TabIndex = 1;
this.opGreen.Text = "Green";
//
// opBlue
//
this.opBlue.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.opBlue.ForeColor = System.Drawing.Color.Blue;
this.opBlue.Location = new System.Drawing.Point(32, 88);
this.opBlue.Name = "opBlue";
this.opBlue.Size = new System.Drawing.Size(80, 16);
this.opBlue.TabIndex = 2;
this.opBlue.Text = "Blue";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(224, 205);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.groupBox1});
this.Name = "Form1";
this.Text = "Observer demo";
this.groupBox1.ResumeLayout(false);
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void opButton_Click(object sender, System.EventArgs e) {
RadioButton but = (RadioButton)sender;
for(int i=0; i< observers.Count ; i++ ) {
Observer obs = (Observer)observers[i];
obs.sendNotify (but.Text );
}
}
}
}
