Event Procedure

By Kardi Teknomo, PhD .

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VB Event Procedure

When an object in Visual Basic recognizes that an event has occurred, it automatically invokes the event procedure using the name corresponding to the event.

1. Make a new project and drag and drop a label into the form
2. Change the name property of the label into lblXY
3. Change autosize property of the label into true
4. In the declaration section, type the following code:

Option Explicit
Private increment As Long
Private lastX As Single
Private lastY As Single

5. Type this procedure in Form_MouseDown and Form_MouseMove event procedures.

Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
       increment = increment + 1
       If increment Mod 2 = 0 Then
           Me.Line (lastX, lastY)-(X, Y)
       Else
           lastX = X
           lastY = Y
       End If
End Sub

Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
       lblXY.Caption = "(X, Y)= " & X & " , " & Y
       Me.PSet (X, Y), vbBlue
End Sub

6. Run the program and now you can draw in the form using your mouse

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