Csharp/C Sharp/GUI Windows Form/Mouse On Form

Mouse event on a control

<source lang="csharp"> /* C# Programming Tips & Techniques by Charles Wright, Kris Jamsa Publisher: Osborne/McGraw-Hill (December 28, 2001) ISBN: 0072193794

• /

using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Reflection; namespace Events {

 /// <summary>
 /// Summary description for FormEvents.
 /// </summary>
 public class FormEvents : System.Windows.Forms.Form
 {
   private System.Windows.Forms.Button btnOK;
   private System.Windows.Forms.Button btnCancel;
   private System.Windows.Forms.TextBox textBox1;
   /// <summary>
   /// Required designer variable.
   /// </summary>
   private System.ruponentModel.Container components = null;
   public FormEvents()
   {
     //
     // Required for Windows Form Designer support
     //
     InitializeComponent();
     //
     // TODO: Add any constructor code after InitializeComponent call
     //
     // Add the following line to the constructor.
     Application.Idle += new System.EventHandler(OnIdle);
   }
   private void OnIdle (object sender, EventArgs e)
   {
     btnOK.Enabled = textBox1.Text.Length > 0;
   }
   /// <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.btnOK = new System.Windows.Forms.Button();
     this.btnCancel = new System.Windows.Forms.Button();
     this.textBox1 = new System.Windows.Forms.TextBox();
     this.SuspendLayout();
     // 
     // btnOK
     // 
     this.btnOK.BackColor = System.Drawing.SystemColors.Control;
     this.btnOK.Location = new System.Drawing.Point(56, 192);
     this.btnOK.Name = "btnOK";
     this.btnOK.Size = new System.Drawing.Size(80, 24);
     this.btnOK.TabIndex = 0;
     this.btnOK.Text = "OK";
     this.btnOK.Click += new System.EventHandler(this.btnOK_OnClick);
     this.btnOK.MouseEnter += new System.EventHandler(this.OnMouseEnter);
     this.btnOK.MouseLeave += new System.EventHandler(this.OnMouseLeave);
     // 
     // btnCancel
     // 
     this.btnCancel.BackColor = System.Drawing.SystemColors.Control;
     this.btnCancel.Location = new System.Drawing.Point(160, 192);
     this.btnCancel.Name = "btnCancel";
     this.btnCancel.Size = new System.Drawing.Size(88, 24);
     this.btnCancel.TabIndex = 1;
     this.btnCancel.Text = "Cancel";
     this.btnCancel.Click += new System.EventHandler(this.btnCancel_OnClick);
     this.btnCancel.MouseEnter += new System.EventHandler(this.OnMouseEnter);
     this.btnCancel.MouseLeave += new System.EventHandler(this.OnMouseLeave);
     // 
     // textBox1
     // 
     this.textBox1.Location = new System.Drawing.Point(48, 144);
     this.textBox1.Name = "textBox1";
     this.textBox1.Size = new System.Drawing.Size(200, 20);
     this.textBox1.TabIndex = 2;
     this.textBox1.Text = "";
     // 
     // FormEvents
     // 
     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.textBox1,
                                     this.btnCancel,
                                     this.btnOK});
     this.Name = "FormEvents";
     this.Text = "FormEvents";
     this.ResumeLayout(false);
   }
   #endregion
   /// <summary>
   /// The main entry point for the application.
   /// </summary>
   [STAThread]
   static void Main() 
   {
     Application.Run(new FormEvents());
   }
   private void btnOK_OnClick(object sender, System.EventArgs e)
   {
     MessageBox.Show ("OK button clicked", "Events");
   }
   private void btnCancel_OnClick(object sender, System.EventArgs e)
   {
     MessageBox.Show ("Cancel button clicked", "Events");
   }
   private void OnMouseEnter(object sender, System.EventArgs e)
   {
           // Test whether the sender is a button
     if (sender is Button)
     {
               // Change the OK button style to Flat, but the
               // change the background color of the Cancel button
       if (sender == btnOK)
         ((Button) sender).FlatStyle = FlatStyle.Flat;
       else if (sender == btnCancel)
         ((Button) sender).BackColor = SystemColors.ControlLightLight;
       return;
     }
           // Add code here to handle MouseEnter event for other controls
   }
   private void OnMouseLeave(object sender, System.EventArgs e)
   {
           // Test whether the sender is a button
     if (sender is Button)
     {
               // Change the OK button style to Flat, but the
               // change the background color of the Cancel button
       if (sender == btnOK)
         ((Button) sender).FlatStyle = FlatStyle.Standard;
       else if (sender == btnCancel)
         ((Button) sender).BackColor = SystemColors.Control;
       return;
     }
           // Add code here to handle MouseLeave event for other controls
   }
 }

}

      </source>