TUpDownOnClick (Delphi)

Description

This example requires a new TPageControl, as-is, with no new pages created at design time, and a TUpDown control, also from the Win95 page of the component palette. The form's OnCreate event handler adds several new TabSheet controls to the Page Control. The UpDown1Click event handler fires when you click the up or down button on the TUpDown control. The SelectNextPage method of the Page Control goes forward the comparison (Button = btNext) evaluates as true. If Button is not btNext, the previous Tab Page is selected.

Code

procedure TForm1.FormCreate(Sender: TObject);
var
  i: Integer;
const
  colorPalette: Array[0..11] of TColor =
    (clRed, clGreen, clYellow, clBlue, clWhite, clFuchsia,
    clTeal, clNavy, clMaroon, clLime, clOlive, clPurple);
begin
  for i := 0 to 9 do
    with TTabSheet.Create(Self) do
    begin
      PageControl := PageControl1;
      Caption := 'TabSheet #' + IntToStr(i);
      Brush.Color := colorPalette[i];
    end;
end;

procedure TForm1.UpDown1Click(Sender: TObject; Button: TUDBtnType);
begin
  PageControl1.SelectNextPage(Button = btNext);
end;

Uses

• Vcl.Forms.TCustomForm.OnCreate ( fr | de | ja )
• Vcl.ComCtrls.TCustomUpDown.OnClick ( fr | de | ja )
• Vcl.ComCtrls.TPageControl.SelectNextPage ( fr | de | ja )