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Stopping a Form from being Dragged

Posted on 2006-11-07
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Last Modified: 2010-04-16
HI,
I have a form that is set for FixToolWindows, but i can still drag it around the screen, i don’t want the user to have this ability but i want to keep this setting….

What do I change to have this happen?
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Question by:schenkp
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3 Comments
 
LVL 11

Expert Comment

by:Agarici
ID: 17896239
add this to your form code :
        protected override void WndProc(ref Message m)
        {
            if ( m.Msg == 0x0084/*WM_NCHITTEST*/ )
                return;
            base.WndProc(ref m);
        }
hth,
A.
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LVL 48

Accepted Solution

by:
AlexFM earned 500 total points
ID: 17896254
       const int WM_NCHITTEST = 0x84;
        const int HTCAPTION = 2;
        const int HTCLIENT = 1;

        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);

            if (m.Msg == WM_NCHITTEST  && m.Result.ToInt32() == HTCAPTION)
                m.Result = new IntPtr(HTCLIENT);
        }

This prevents form from moving by mouse, but there is still other way to move form: right-click on title bar, select Move, and then it is possible to move form. Right now I don't know how to prevent this, I will think about this.
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LVL 48

Expert Comment

by:AlexFM
ID: 17896258
Agarici, your version prevents form from closing by clicking x button. However, if form doesn't have Close button, it is OK.
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