Re: [Lazarus] TTimer woes (newbie)

[Howard Page-Clark]

On 31/03/2014 10:25, Michael Schnell wrote:
On 03/31/2014 01:44 AM, Bob Axtell wrote:
can someone show a newbie how to use the two system timers?

What do you mean by system timers ?

I think he means the TTimer and TIdleTimer found on the System page of 
the Component Palette.
If you drop one of each on the main form of a new project with a label 
and a memo, and add this code, it should give you an idea of how to use 
them.

-- code begin --

unit Unit1;

{$mode objfpc}{$H+}

interface

uses
  SysUtils, Forms, ExtCtrls, StdCtrls;

type

  { TForm1 }

  TForm1 = class(TForm)
    IdleTimer1: TIdleTimer;
    LAverageSoFar: TLabel;
    MNumbers: TMemo;
    Timer1: TTimer;
    procedure FormCreate(Sender: TObject);
    procedure IdleTimer1Timer(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    FNumber: integer;
    FRunningTotal: integer;
    FCount: integer;
  end;

var
  Form1: TForm1;

implementation

{$R *.lfm}

{ TForm1 }

procedure TForm1.FormCreate(Sender: TObject);
begin
  Randomize;
  MNumbers.Clear;

  Timer1.Interval:=500;
  Timer1.OnTimer:=@Timer1Timer;
  Timer1.Enabled:=True;

  IdleTimer1.Interval:=1000;
  IdleTimer1.OnTimer:=@IdleTimer1Timer;
  IdleTimer1.Enabled:=True;
end;

procedure TForm1.IdleTimer1Timer(Sender: TObject);
begin
  LAverageSoFar.Caption:=
    Format('Average of random numbers so far is 
%n',[FRunningTotal/FCount]);
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  FNumber:=Random(101);
  MNumbers.Lines.Add(IntToStr(FNumber));
  Inc(FCount);
  Inc(FRunningTotal, FNumber);
end;

end.

-- code end --

Howard


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