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VB.Net - subsequent form's Center Parent not good enough

Posted on 2007-12-05
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Last Modified: 2012-06-21
I've got a popup form, show dialog, set to center parent.
Any easy way to move it up a notch or two (vertically)?

I like the positioning except that it's hanging over some text on the parent form, that I'd rather avoid hiding...
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Question by:sirbounty
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Expert Comment

by:Bob Learned
ID: 20412970
The StartPosition is only a place to start when the form is first show.  If you want to move the form after it is shown, you can do that.  You will get a little jump, though, as the form is moved.  In order to keep from jumping, you could handle centering the child on the parent with your own code.

Bob
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Accepted Solution

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jcoehoorn earned 75 total points
ID: 20412982
You can use manual, and set the form's left and top properties accordingly.  However, I think those properties work relative to the screen (I could be wrong in cases where you set the form's owner, I'd have to check that again to remember for sure), so you may need to use the parent form's PointToScreen() method to get your position set correctly relative to that form.
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Author Comment

by:sirbounty
ID: 20413089
I was thinking that I would have to do some calculations with the parent form's position, but wasn't sure if that was different with .Net....
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LVL 96

Assisted Solution

by:Bob Learned
Bob Learned earned 125 total points
ID: 20413116
It is pretty much the same as with VB6, but you have some different properties for the Form to help you:  DisplayRectangle, ClientSize, and Bounds.

Bob
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LVL 67

Author Comment

by:sirbounty
ID: 20413538
This seems to do it...does the logic look okay?

       Dim frmCal As New frmCalendar
       frmCal.StartPosition = FormStartPosition.Manual
       frmCal.Left = (Me.Left + (Me.Width / 2)) - frmCal.Width / 2
       frmCal.Top = ((Me.Top + (Me.Height / 2)) - frmCal.Height / 2) - 30 ' Subtract 30 twips to raise the top property of frmCal

And now that I've done it, I still want what I was thinking of adding earlier...some sort of border.  But that's another question.
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Author Comment

by:sirbounty
ID: 20413545
Based on your comments Bob, would it be better to set the bounds, rather than the top/left properties?
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LVL 96

Assisted Solution

by:Bob Learned
Bob Learned earned 125 total points
ID: 20413572
That code looks good.  The Bounds property is good for getting the Top, Left, Width and Height, and probably wouldn't help much here.

Bob
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