Consider the example in Fig. 21.27. Suppose we change the MouseMove event handler to the code below. What happens when the user moves the mouse? Assume that the lblDis- play Label has been placed on the Form.
private void FrmPainter_MouseMove(
object sender, System.Windows.Forms.MouseEventArgs e )
{
lblDisplay.Text = "I'm at " + e.X + ", " + e.Y + ".";
} // end method FrmPainter_MouseMove
The Label continuously displays the mouse pointer’s current position on the Form.
The complete code reads:
// Painter.cs
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace MousePointer
{
///
/// Summary description for FrmPainter.
///
public class FrmPainter : System.Windows.Forms.Form
{
private System.Windows.Forms.Label lblPosition;
private System.Windows.Forms.Label lblDisplay;
///
/// Required designer variable.
///
private System.ComponentModel.Container components = null;
public FrmPainter()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent
// call
//
}
///
/// Clean up any resources being used.
///
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
// Windows Form Designer generated code
///
/// The main entry point for the application.
///
[STAThread]
static void Main()
{
Application.Run( new FrmPainter() );
}
// displays the mouse's current x and y coordinates
private void FrmPainter_MouseMove(
object sender, System.Windows.Forms.MouseEventArgs e )
{
lblDisplay.Text = "I'm at " + e.X + ", " + e.Y + ".";
} // end method FrmPainter_MouseMove
} // end class FrmPainter
}
Computer Science & Information Technology
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