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Moving controls on a form at runtime

Posted on 1997-05-28
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Last Modified: 2010-04-06
I want to write a program where the user can put any ordinary control on a form and move it. The problem is that any mouse / keyboard messages goes to the control and not to the form. I consulted the Lischner "Undocumented Delphi" but found no answer. Anybody any ideas ?
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Question by:arnoldu
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by:arnoldu
ID: 1336635
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sleach earned 50 total points
ID: 1336636
Make a universal event handler/procedure that is common to all controls.  Then at the time you add the component, assing the handler to the event.  Example:
 
NewControl.OnMouseMove := MouseMove;

The Universal event handler can get/set top & left properties so as to move them to wherever you want on the form.  You could also use the OnMouseDown event if you rather.
Hope this helps.

{Example Procedure}
procedure TForm1.MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
var
Top, Left:  Integer;
begin
{Get top & Left positions of the control}
Top := (sender as TControl.top);
Left := (sender as TControl.left);

{Set Top & Left postions of the control}
(sender as TControl.top) := 10;
(sender as TControl.Left) := 5;
end;

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