Csharp/C Sharp/GUI Windows Form/User Control

Creating an event for a component.

 

using System;
using System.Collections;
using System.ruponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;

public class CompoundControl : System.Windows.Forms.UserControl {
    public delegate Boolean ValueChangedEventHandler(int nValue);
    private System.Windows.Forms.Label label1;
    private System.Windows.Forms.ruboBox comboBox1;
    public event ValueChangedEventHandler Changed;
    public CompoundControl() {
        this.ruboBox1 = new System.Windows.Forms.ruboBox();
        this.label1 = new System.Windows.Forms.Label();
        this.SuspendLayout();
        this.ruboBox1.DropDownWidth = 121;
        this.ruboBox1.Items.AddRange(new object[] {"A","B","C","F","G","N"});
        this.ruboBox1.Location = new System.Drawing.Point(24, 48);
        this.ruboBox1.Size = new System.Drawing.Size(200, 21);
        this.ruboBox1.Text = "comboBox1";
        this.ruboBox1.SelectedIndexChanged += new System.EventHandler(this.OnSelectionIndexChange);
        this.label1.Location = new System.Drawing.Point(16, 24);
        this.label1.Text = "Select An Entry";
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
        this.ruboBox1,
        this.label1});
        this.Size = new System.Drawing.Size(240, 96);
        this.ResumeLayout(false);
    }
    private void OnSelectionIndexChange(object sender,
        System.EventArgs e) {
        if (Changed != null)
            Changed(this.ruboBox1.SelectedIndex);
    }
}

public class Form1 : System.Windows.Forms.Form {
    private System.ruponentModel.Container components = null;
    private CompoundControl compoundcomponent1 = null;
    public Form1() {
        this.rupoundcomponent1 = new CompoundControl();
        this.rupoundcomponent1.Location = new System.Drawing.Point(24, 50);
        this.rupoundcomponent1.Name = "compound1";
        this.rupoundcomponent1.Size = new System.Drawing.Size(250, 100);
        this.rupoundcomponent1.Changed += new CompoundControl.ValueChangedEventHandler(OnChanged);
        this.ruponents = new System.ruponentModel.Container();
        this.Size = new System.Drawing.Size(300, 300);
        this.Controls.AddRange(new System.Windows.Forms.Control[]{this.rupoundcomponent1,});
    }
    private bool OnChanged(int nIndex) {
        MessageBox.Show(this, "New Index!" + nIndex);
        return true;
    }
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }
}

Define user control

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
public class Form1 : Form
{
    private ClockUserControl clockUserControl1;
  public Form1() {
        InitializeComponent();
  }

      private void InitializeComponent()
      {
         this.clockUserControl1 = new ClockUserControl();
         this.SuspendLayout();
         // 
         // clockUserControl1
         // 
         this.clockUserControl1.Location = new System.Drawing.Point(12, 12);
         this.clockUserControl1.Name = "clockUserControl1";
         this.clockUserControl1.Size = new System.Drawing.Size(154, 74);
         this.clockUserControl1.TabIndex = 0;
         // 
         // Clock
         // 
         this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
         this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
         this.ClientSize = new System.Drawing.Size(178, 99);
         this.Controls.Add(this.clockUserControl1);
         this.Name = "Clock";
         this.Text = "Clock";
         this.ResumeLayout(false);
      }
  [STAThread]
  static void Main()
  {
    Application.EnableVisualStyles();
    Application.Run(new Form1());
  }
}

public class ClockUserControl : UserControl
{
      private System.Windows.Forms.Label displayLabel;
      private System.Windows.Forms.Timer clockTimer;
      
      public ClockUserControl() {
         InitializeComponent();
      }  
      private void clockTimer_Tick(object sender, EventArgs e) {
         displayLabel.Text = DateTime.Now.ToLongTimeString();
      }
      private void InitializeComponent()
      {
         this.displayLabel = new System.Windows.Forms.Label();
         this.clockTimer = new System.Windows.Forms.Timer( new System.ruponentModel.Container() );
         this.SuspendLayout();
         // 
         // displayLabel
         // 
         this.displayLabel.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
         this.displayLabel.Font = new System.Drawing.Font( "Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ( ( byte ) ( 0 ) ) );
         this.displayLabel.Location = new System.Drawing.Point( 4, 10 );
         this.displayLabel.Name = "displayLabel";
         this.displayLabel.Size = new System.Drawing.Size( 143, 52 );
         this.displayLabel.TabIndex = 0;
         this.displayLabel.Text = "12:55:55 AM";
         this.displayLabel.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
         // 
         // clockTimer
         // 
         this.clockTimer.Enabled = true;
         this.clockTimer.Interval = 1000;
         this.clockTimer.Tick += new System.EventHandler( this.clockTimer_Tick );
         // 
         // ClockUserControl
         // 
         this.AutoScaleDimensions = new System.Drawing.SizeF( 6F, 13F );
         this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
         this.BackColor = System.Drawing.Color.White;
         this.Controls.Add( this.displayLabel );
         this.Name = "ClockUserControl";
         this.Size = new System.Drawing.Size( 150, 72 );
         this.ResumeLayout( false );
      }
}

Draw a Custom Control

 
using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
public class SimpleCustomControl : System.Windows.Forms.Control {
    public SimpleCustomControl() {
        InitializeComponent();
    }
    private void SimpleCustomControl_Paint(object sender, PaintEventArgs e) {
        Graphics g = e.Graphics;
        g.FillRectangle(Brushes.Yellow, ClientRectangle);
        g.DrawString("Hello, world", Font, Brushes.Black, 0, 0);
    }
    private void InitializeComponent() {
        this.SuspendLayout();
        this.Paint += new System.Windows.Forms.PaintEventHandler(this.SimpleCustomControl_Paint);
        this.ResumeLayout(false);
    }
}

public class Form1 : Form {
    public Form1() {
        InitializeComponent();
    }
    private void InitializeComponent() {
        this.simpleCustomControl1 = new SimpleCustomControl();
        this.SuspendLayout();
        this.simpleCustomControl1.Location = new System.Drawing.Point(12, 12);
        this.simpleCustomControl1.Size = new System.Drawing.Size(178, 110);
        this.simpleCustomControl1.Text = "simpleCustomControl1";
        this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(292, 268);
        this.Controls.Add(this.simpleCustomControl1);
        this.ResumeLayout(false);
    }
    private SimpleCustomControl simpleCustomControl1;
    [STAThread]
    static void Main() {
        Application.EnableVisualStyles();
        Application.Run(new Form1());
    }
}

subclass System.Windows.Forms.UserControl to create custom control

 

using System;
using System.Collections;
using System.ruponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;
public class UserControl1 : System.Windows.Forms.UserControl {
    private System.ruponentModel.Container components = null;
    public UserControl1() {
        this.Name = "UserControl1";
        this.Paint += new
         System.Windows.Forms.PaintEventHandler(this.OnPaint);
    }

    private void OnPaint(object sender,
         System.Windows.Forms.PaintEventArgs e) {
        e.Graphics.DrawString("Hello world", Font,
           new SolidBrush(Color.Blue), ClientRectangle);
    }
}
public class Form1 : System.Windows.Forms.Form {
    private System.ruponentModel.Container components = null;
    private System.Windows.Forms.Label label1;
    private UserControl1 control1;
    public Form1() {
        this.control1 = new UserControl1();
        this.label1 = new System.Windows.Forms.Label();
        this.SuspendLayout();
        this.control1.Location = new System.Drawing.Point(32, 48);
        this.control1.Size = new System.Drawing.Size(80, 24);
        this.label1.Location = new System.Drawing.Point(32, 24);
        this.label1.Size = new System.Drawing.Size(144, 24);
        this.label1.Text = "Custom Control:";
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(292, 273);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
        this.label1,
        this.control1});
        this.ResumeLayout(false);
    }
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }
}

The read-only property control.

 

using System;
using System.Collections;
using System.ruponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;

public class TimerCounter : System.Windows.Forms.UserControl {
    private System.Windows.Forms.Timer timer1;
    private System.ruponentModel.IContainer components;
    private int fCounter = 0;
    public int Counter {
        get {
            return fCounter;
        }
    }
    public TimerCounter() {
        this.ruponents = new System.ruponentModel.Container();
        this.timer1 = new System.Windows.Forms.Timer(this.ruponents);
        this.timer1.Enabled = true;
        this.timer1.Interval = 1000;
        this.timer1.Tick += new System.EventHandler(this.OnTick);
        this.Name = "TimerCounter";
    }
    private void OnTick(object sender, System.EventArgs e) {
        fCounter++;
    }
}
public class Form1 : System.Windows.Forms.Form {
    private System.Windows.Forms.Label label1 = new System.Windows.Forms.Label();
    private System.Windows.Forms.Label CounterLabel;
    private System.Windows.Forms.Button Update;
    private System.ruponentModel.Container components = null;
    private TimerCounter counter;
    public Form1() {
        counter = new TimerCounter();
        this.CounterLabel = new System.Windows.Forms.Label();
        this.Update = new System.Windows.Forms.Button();
        this.SuspendLayout();
        this.label1.Location = new System.Drawing.Point(32, 24);
        this.label1.Size = new System.Drawing.Size(48, 23);
        this.label1.Text = "Counter: ";
        this.CounterLabel.Location = new System.Drawing.Point(96, 24);
        this.CounterLabel.Size = new System.Drawing.Size(32, 23);
        this.Update.Location = new System.Drawing.Point(80, 72);
        this.Update.Text = "Update";
        this.Update.Click += new System.EventHandler(this.Update_Click);
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(224, 133);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {this.Update,this.CounterLabel,this.label1});
        this.ResumeLayout(false);
    }
    [STAThread]
    static void Main() {
        Application.Run(new Form1());
    }
    private void Update_Click(object sender, System.EventArgs e) {
        CounterLabel.Text = counter.Counter.ToString();
    }
}