Prevent tab key from navigating out of an FireMonkey button

FMX
1

How can I prevent the tab key from navigating away from a FireMonkey button ?

If the user presses TAB key, I want the button to remain as the active control

I have tried various code in OnKeyDown and OnKeyUp but cant get it to work

Any ideas ?

Scott

2

One way is to override the KeyDown method of the form, and check the focused control, like this:

unit Unit1;

interface

uses
  System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
  FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.Edit, FMX.Controls.Presentation, FMX.StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
  private
    { Private declarations }
  public
    procedure KeyDown(var Key: Word; var KeyChar: System.WideChar; Shift: TShiftState); override;
  end;

var
  Form1: TForm1;

implementation

{$R *.fmx}

procedure TForm1.KeyDown(var Key: Word; var KeyChar: System.WideChar; Shift: TShiftState);
begin
  if (Key = vkTab) and (Focused <> nil) and (Focused.GetObject = Button1) then
  begin
    Key := 0;
    KeyChar := #0;
  end
  else
    inherited;
end;

end.
2 Likes
3

Thanks Dave

That worked