Here’s a little VB.NET code snippet that I wrote to make a Form semi-transparent when moving and resizing it. I think this is a neat little effect to add to an application.
Public Class frmTransparentMoveResize Inherits System.Windows.Forms.Form Private _OpacityResize As Double = 0.5 Private _OpacityMove As Double = 0.5 Private _OpacityOriginal As Double Private Const WM_NCLBUTTONDOWN As Long = &HA1 Private Const WM_NCLBUTTONUP As Long = &HA0 Private Const WM_MOVING As Long = &H216 Private Const WM_SIZE As Long = &H5 Protected Overrides Sub DefWndProc(ByRef m As System.Windows.Forms.Message) Static LButtonDown As Boolean 'Check the state of the Left Mouse Button If CLng(m.Msg) = WM_NCLBUTTONDOWN Then 'set LButtonDown to True is Left Mouse Button is down LButtonDown = True ElseIf CLng(m.Msg) = WM_NCLBUTTONUP Then 'set LButtonDown to False is Left Mouse Button is not down LButtonDown = False End If If LButtonDown Then If CLng(m.Msg) = WM_MOVING Then 'Set the forms opacity to 50% if user is draging the window If Me.Opacity <> _OpacityMove Then _OpacityOriginal = Me.Opacity Me.Opacity = _OpacityMove End If ElseIf CLng(m.Msg) = WM_SIZE Then 'Set the forms opacity to 50% if user is resizing the window If Me.Opacity <> _OpacityResize Then _OpacityOriginal = Me.Opacity Me.Opacity = _OpacityResize End If End If ElseIf Not LButtonDown Then If Me.Opacity <> _OpacityOriginal Then Me.Opacity = _OpacityOriginal End If MyBase.DefWndProc(m) End Sub Public Property OpacityMove() As Double Get Return _OpacityMove End Get Set(ByVal Value As Double) _OpacityMove = Value End Set End Property Public Property OpacityResize() As Double Get Return _OpacityResize End Get Set(ByVal Value As Double) _OpacityResize = Value End Set End Property End Class
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