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Tip of the Day
Language: VB7
Expertise: beginner
Apr 28, 2003

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ImplodeForm - Hiding a form with an implosion effect

' Hiding a form with an implosion effect.
' the numSteps parameter is the number of steps to decrease the form size from 
' the current size to 0
' the stepDuration argument is the number of milliseconds between each step

' Example:
'   Private Sub Form1_Closing(...) Handles MyBase.Closing
'      ImplodeForm(Me)
'   End Sub

Sub ImplodeForm(ByVal frm As Form, Optional ByVal numSteps As Integer = 25, _
    Optional ByVal stepDuration As Integer = 10)
    ' do nothing if the form is minimized or maximized
    If frm.WindowState <> FormWindowState.Normal Then Exit Sub

    Dim origLeft As Integer = frm.Left
    Dim origTop As Integer = frm.Top
    Dim currHeight As Integer = frm.Height
    Dim currWidth As Integer = frm.Width
    Dim stepHeight = currHeight / numSteps
    Dim stepWidth = currWidth / numSteps

    Dim i As Integer
    For i = 1 To numSteps
        'calc the new height/width
        currHeight -= stepHeight
        currWidth -= stepWidth
        ' display the form
        frm.SetBounds(origLeft, origTop, currWidth, currHeight)
        ' pause if so is requested
        System.Threading.Thread.CurrentThread.Sleep(stepDuration)
    Next
End Sub
Marco Bellinaso
 
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