|
|
|
| Title | Change a form's opacity in VB .NET |
|---|
| Keywords | form, Opacity, transparent, translucent, VB.NET |
|---|
| Categories | Graphics, VB.NET, Tips and Tricks |
|---|
|
|
|
A form's Opacity property determines how opaque it is. Opacity = 1 means the form is opaque and Opacity = 0 means the form is transparent. Values between 0 and 1 make a translucent form.
Warning: The IDE's Property window displays this value as 0% to 100% but your code must use values between 0 to 1.
This program modifies its form's Opacity in two ways. First, when you adjust the value of the hbarOpacity scroll bar, the program adjusts the form's Opacity.
|
|
Private Sub hbarOpacity_Scroll(ByVal sender As _
System.Object, ByVal e As _
System.Windows.Forms.ScrollEventArgs) Handles _
hbarOpacity.Scroll
Me.Opacity = 0.1 + hbarOpacity.Value / 100
Me.Text = Me.Opacity.ToString
End Sub
|
|
|
Second, when you click the Close button, the form enables a timer. The timer gradually reduces the form's Opacity until it dissappears, at which point the timer closes the form. This makes the form fade out gradually.
|
|
Private Sub btnClose_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnClose.Click
Timer1.Enabled = True
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Timer1.Tick
Me.Opacity = Me.Opacity - 0.1
If Me.Opacity <= 0 Then Me.Close()
End Sub
|
| |
|
| |
|
|
