Changing properties for all components of a certain type

Problem/Question/Abstract:

Changing properties for all components of a certain type

Answer:

To change the font color of all the labels of a form to a certain color, call the following procedure. In the call itself, you have to replace NewColor with an existing color, e.g. SetLabelsFontColor(clRed) sets all the labels' font color to red.

procedure TForm1.SetLabelsFontColor(NewColor: TColor);
var
  i: Integer;
begin
  for i := 0 to ComponentCount - 1 do
    if Components[i] is TLabel then
      TLabel(Components[i]).Font.Color := NewColor;
end;

Of course, you can use this technique to change other properties of other components. To change the color of all edits, the code would be:

procedure TForm1.SetEditsColor(NewColor: TColor);
var
  i: Integer;
begin
  for i := 0 to ComponentCount - 1 do
    if Components[i] is TEdit then
      TEdit(Components[i]).Color := NewColor;
end;