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Delphi 7: How to close a child form by double clicking on it

Posted on 2009-07-07
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Last Modified: 2013-11-23
Dear Experts,
I have a form that pops up to invite the user to select from a list of options.   The list is displayed as a grid inside a form.  I want the user to be able to double click one of the rows to select that item and automatically close the child form that displays the grid.  

I can work out how to generate the doubleclick event.  In the Delphi 7 IDE I can get it to generate the following code for the child form:

procedure TForm4.NextGrid1DblClick(Sender: TObject);
begin

end;

However I am not sure how to make the child form return control to the parent form.

If I just click an OK button on the child form I can grab the user's selection with this code:

   if (Form4.showmodal = mrOK) then
      result:= Form4.NextGrid1.SelectedRow
  else
     result:=-1;

How can I achieve a similar thing by double clicking.  

In Visual C++ I could send a windows message with WM_CLOSE but I'm not sure how suitable this is in Delphi.
Sincerely,

Philip Truscott
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Question by:PTRUSCOTT
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3 Comments
 
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Accepted Solution

by:
JonasMalmsten earned 1000 total points
ID: 24800696
In the double click event, put

ModalResult := mrOk;

control will be returned to the calling form (back to after ShowModal). You can close the form from here after you have extracted the information you need from the form (selected row of the grid).
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LVL 1

Author Comment

by:PTRUSCOTT
ID: 24800910
Amazing.  It feels as if I received a correct answer in real time!  Thanks! It worked!
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LVL 22

Expert Comment

by:8080_Diver
ID: 24804073
You might also want to make sure that you add the following line in the code that called the modal form so that you don't code in a memory leak.
Form4.Release;
P.s. I do hope that you are not actually using  the automatically generated names for the components you are putting on forms or for the forms themselves.  This is Not Good Codding Practice. ;-)
 
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