Control Visibilty
lazarus / 31-LCL

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rrivett · 2011-08-27 17:45

I must be missing something.

If I set ListView1.Visible to True directly on the form then launch
the program, the following procedure hides the control.

Code: [Select]procedure HideObjectList();
begin

   fmMain.ListView1.Visible := False
   
end;              

But if I set ListView1.Visible to False directly on the form then
launch the program, the following procedure does nothing. ListView1
remains hidden.

I am calling HideObject List from a menu action.

Code: [Select]Procedure HideObjectList();
begin

   fmMain.ListView1.Visible := False
   
end;              
Code: [Select]
Why doesn't setting the control's visible property to true actually
make it visible?

Thanks.

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howardpc · 2011-08-27 18:00

If you want to toggle visibility on and off you should use code
something like this:

Code: [Select]Procedure TForm1.Button1Click(Sender: TObject);
Begin
  ListView1.Visible := not ListView1.Visible;
end;    

Howard

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joseme · 2011-08-27 18:15

If you want to show the component, you should put its .Visible
property to True. Sometimes this is not enough because the control
falls behind another controls in the form, so it is necessary to call
the .BringtoFront function.