32.16 How do I prevent a user from moving a form at run time? |
The following code snippet (posted in the Windows Forms FAQ forums) shows how you can prevent a user from moving a form at run time: |
| [C#]
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| protected override void WndProc(ref Message m)
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| {
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| const int WM_NCLBUTTONDOWN = 161;
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| const int WM_SYSCOMMAND = 274;
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| const int HTCAPTION = 2;
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| const int SC_MOVE = 61456;
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|
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| if((m.Msg == WM_SYSCOMMAND) && (m.WParam.ToInt32() == SC_MOVE))
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| {
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| return;
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| }
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|
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| if((m.Msg == WM_NCLBUTTONDOWN) && (m.WParam.ToInt32() == HTCAPTION))
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| {
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| return;
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| }
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|
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| base.WndProc (ref m);
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| }
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| [VB.NET]
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| Protected Overrides Sub WndProc(ByRef m As Message)
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| const Integer WM_NCLBUTTONDOWN = 161
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| const Integer WM_SYSCOMMAND = 274
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| const Integer HTCAPTION = 2
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| const Integer SC_MOVE = 61456
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| If (m.Msg = WM_SYSCOMMAND) &&(m.WParam.ToInt32() = SC_MOVE) Then
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| Return
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| End If
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|
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| If (m.Msg = WM_NCLBUTTONDOWN) &&(m.WParam.ToInt32() = HTCAPTION) Then
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| Return
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| End If
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| MyBase.WndProc( m)
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| End Sub
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