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.NET Forum / Windows Forms / WinForm General / September 2004

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Property to lock form at run time

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TS - 03 Sep 2004 15:55 GMT
I can't find a property to lock the form so that you can't drag it around by
the title bar. The locked property doensn't do this.
Morten Wennevik - 03 Sep 2004 16:11 GMT
Hi TS,

The locked property is for locking the size of the form in the designer not at runtime.
Title bars are designed to be dragable so to prevent dragging remove the title bar (set borderstyle to none).

Signature

Happy coding!
Morten Wennevik [C# MVP]

Herfried K. Wagner [MVP] - 03 Sep 2004 16:55 GMT
* "TS" <manofsteele@311.com> scripsit:
> I can't find a property to lock the form so that you can't drag it around by
> the title bar. The locked property doensn't do this.

From my FAQ (<URL:http://dotnet.mvps.org/dotnet/faqs/>):

Based on an implementation written by Tom Spink.

The code below defines a base class that provides a 'Moveable' property.
By inheriting from this class and setting the 'Moveable' property to
'False', the user will be prevented from moving then form:

\\\
Imports System.ComponentModel
Imports System.Windows.Forms

Public Class MoveableForm
   Inherits Form

   Private Const WM_NCLBUTTONDOWN As Int32 = &HA1
   Private Const WM_SYSCOMMAND As Int32 = &H112

   Private Const HTCAPTION As Int32 = &H2

   Private Const SC_MOVE As Int32 = &HF010

   Private m_Moveable As Boolean

   Public Sub New()
       MyBase.New()
       Me.Moveable = True
   End Sub

   < _
       Category("Behavior"), _
       Description("Allows the form to be moved.") _
   > _
   Public Property Moveable() As Boolean
       Get
           Return m_Moveable
       End Get
       Set(ByVal Value As Boolean)
           m_Moveable = Value
       End Set
   End Property

   Protected Overrides Sub WndProc(ByRef m As Message)
       If Not m_Moveable Then
           If _
               m.Msg = WM_SYSCOMMAND And _
               m.WParam.ToInt32() = SC_MOVE _
               OrElse _
               m.Msg = WM_NCLBUTTONDOWN And _
               m.WParam.ToInt32() = HTCAPTION _
           Then
               Return
           End If
       End If
       MyBase.WndProc(m)
   End Sub
End Class
///

Signature

M S   Herfried K. Wagner
M V P  <URL:http://dotnet.mvps.org/>
V B   <URL:http://dotnet.mvps.org/dotnet/faqs/

TS - 08 Sep 2004 15:49 GMT
Cool, let me give that a go and see if it works, becuase I need to keep the
title bar, so the previous post won't work

thank you

> * "TS" <manofsteele@311.com> scripsit:
> > I can't find a property to lock the form so that you can't drag it around by
[quoted text clipped - 58 lines]
> End Class
> ///
"Jeffrey Tan[MSFT]" - 09 Sep 2004 02:31 GMT
Hi TS,

Thanks for your feedback.

Sorry, I am not sure about the "previous post" you are talking about. I
think Herfried's reply should meet your need. This solution disable form's
mouse left button clicking on the title bar, also, it will intercept the
form's "Move" command of system menu. Through these 2 steps, we can prevent
a user from moving the form.

Thank you for your patience and cooperation. If you have any questions or
concerns, please feel free to post it in the group. I am standing by to be
of assistance.

Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Signature

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TS - 09 Sep 2004 21:13 GMT
worked like a charm, thanks a lot

> * "TS" <manofsteele@311.com> scripsit:
> > I can't find a property to lock the form so that you can't drag it around by
[quoted text clipped - 58 lines]
> End Class
> ///

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