Dialog Apply Event Illustration : Dialog « GUI Windows Forms « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. GUI Windows Forms
3. Dialog

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

public class DialogApplyEvent : System.Windows.Forms.Form
{
  private System.Windows.Forms.Button btnCreate;
  private System.Windows.Forms.Label lblReturn;

  public DialogApplyEvent()
  {
    InitializeComponent();
  }

  private void InitializeComponent()
  {
    this.btnCreate = new System.Windows.Forms.Button();
    this.lblReturn = new System.Windows.Forms.Label();
    this.SuspendLayout();
    // 
    // btnCreate
    // 
    this.btnCreate.Location = new System.Drawing.Point(72, 176);
    this.btnCreate.Name = "btnCreate";
    this.btnCreate.Size = new System.Drawing.Size(144, 23);
    this.btnCreate.TabIndex = 0;
    this.btnCreate.Text = "Create Dialog Box";
    this.btnCreate.Click += new System.EventHandler(this.btnCreate_Click);
    // 
    // lblReturn
    // 
    this.lblReturn.Location = new System.Drawing.Point(88, 88);
    this.lblReturn.Name = "lblReturn";
    this.lblReturn.TabIndex = 1;
    // 
    // DialogApplyEvent
    // 
    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.lblReturn,
                                             this.btnCreate});
    this.ResumeLayout(false);

  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new DialogApplyEvent());
  }

  private void btnCreate_Click(object sender, System.EventArgs e)
  {
    DialogDemo dlg = new DialogDemo();
    dlg.EnableApplyButton = false;

    dlg.ClickApply += new EventHandler(DialogDemoOnApply);
    
    dlg.ShowDialog();
    
    if (dlg.DialogResult == DialogResult.OK)
      {lblReturn.Text = dlg.TextOut;}
    else
      {lblReturn.Text = dlg.DialogResult.ToString();}
  }
  
  private void DialogDemoOnApply(object sender, System.EventArgs e)
  {
    DialogDemo dlg = (DialogDemo)sender;
    lblReturn.Text = dlg.TextOut;
    dlg.EnableApplyButton = false;  
  }

}

class DialogDemo : Form
{
  private Button btnApply;
  private TextBox txt;
  public event EventHandler ClickApply;
  
  public DialogDemo()
  {
    FormBorderStyle = FormBorderStyle.FixedDialog;
    BackColor = System.Drawing.Color.Aquamarine;
    ControlBox = false;
    MaximizeBox = false;
    MinimizeBox = false;
    ShowInTaskbar = false;
    Size = new Size(400,200);
    StartPosition = FormStartPosition.CenterScreen;

    Button btnOK = new Button();
    btnOK.Text = "OK";
    btnOK.DialogResult = DialogResult.OK;
    btnOK.Location = new Point(50,50);
    btnOK.TabIndex = 0;
    btnOK.Click += new EventHandler(ApplyButtonOnClick);
    Controls.Add(btnOK);
    
    btnApply = new Button();
    btnApply.Text = "Apply";
    btnApply.Location = new Point(150,50);
    btnApply.TabIndex = 1;
    btnApply.Enabled = false;
    btnApply.Click += new EventHandler(ApplyButtonOnClick);
    Controls.Add(btnApply);
    
    Button btnCancel = new Button();
    btnCancel.Text = "Cancel";
    btnCancel.DialogResult = DialogResult.Cancel;
    btnCancel.Location = new Point(250,50);
    btnCancel.TabIndex = 2;
    Controls.Add(btnCancel);

    txt = new TextBox();
    txt.Size = new Size(100,15);
    txt.Location = new Point(150,15);
    txt.TextChanged += new EventHandler(TextBoxChanged);
    Controls.Add(txt);
    
  }
  
  private void TextBoxChanged(object sender, EventArgs e)
  {
    this.EnableApplyButton = true;  
  }

  public bool EnableApplyButton
  {
    get {return btnApply.Enabled; }
    set {btnApply.Enabled = value; }
  }
  
  public string TextOut
  {
    get {return txt.Text; }
  }
  
  private void ApplyButtonOnClick (object sender, System.EventArgs e)
  {
    if (ClickApply != null)
      ClickApply(this, new EventArgs());
  }
}

23.52.Dialog
	23.52.1.	Call ShowDialog on Form object
	23.52.2.	About DialogBox
	23.52.3.	Define your own dialog box
	23.52.4.	Dialog Apply Event Illustration
	23.52.5.	Define Apply Button action method in dialog class
	23.52.6.	Set DialogResult in your own dialog class
	23.52.7.	Create a custom dialog with radio button group
	23.52.8.	Dialog with two buttons