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How to check when a control changes that it is created at runtime

Posted on 2004-04-21
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Last Modified: 2010-04-05

Hi,

I have the code below which creates a number of radio buttons on the form at runtime, at default none are selected.  I want a procedure that will activate a button if any of the radio buttons are selected, how do I do this?

procedure Tform.CreateRadio(aCaption : String; aValue : Boolean);
var r : TRadioButton;
begin
  r := TRadioButton.Create(self);
  if FRadioList.Count = 0 then
    begin
    r.Top := 28;
    r.width := 15;
    end
  else
    begin
    r.Top := TRadioButton(FRadioList[FRadioList.Count-1]).top + 25;
    r.width := 300;
    end;
  r.left := 8;
  r.parent := self;
  r.caption := aCaption;
  r.checked := aValue;
  FRadioList.Add(r);
end;
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Question by:dealclickcouk
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1 Comment
 
LVL 27

Accepted Solution

by:
kretzschmar earned 200 total points
ID: 10876881
add a onClick event
....
  r.caption := aCaption;
  r.checked := aValue;
  r.onClick := RadioClick;
  FRadioList.Add(r);
....

procedure Tform1.RadioClick(Sender : TObject);
var i : integer;
begin
  i := 0;
  while (i < FRadioList.Count) and
          not(TRadioButton(FRadioList[i]).Checked) do inc(i);
  Button1.enabled := i < FRadioList.Count;
end;

just from head,
usual, if a radio is clicked, it will be checked,
so the loop above may obsolete

meikl ;-)
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