unit FProbUnit;

{$mode objfpc}{$H+}
{$WARN 6058 off : Call to subroutine "$1" marked as inline is not inlined}
interface

uses
  Classes, SysUtils, FileUtil, LResources, Forms, Controls, Graphics, Dialogs,
  StdCtrls, ExtCtrls;

type

  { TFForm }

  TFForm = class(TForm)
    Bevel1: TBevel;
    CancelBtn: TButton;
    ComputeBtn: TButton;
    DF1Edit: TEdit;
    DF2Edit: TEdit;
    Panel1: TPanel;
    ProbEdit: TEdit;
    FEdit: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    ResetBtn: TButton;
    ReturnBtn: TButton;
    procedure ComputeBtnClick(Sender: TObject);
    procedure FormActivate(Sender: TObject);
    procedure ResetBtnClick(Sender: TObject);
  private
    { private declarations }
  public
    { public declarations }
  end; 

var
  FForm: TFForm;

implementation

{$R *.lfm}

uses
  Math, MathUnit, Utils;

{ TFForm }

procedure TFForm.ResetBtnClick(Sender: TObject);
begin
  FEdit.Text := '';
  DF1Edit.Text := '';
  DF2Edit.Text := '';
  ProbEdit.Text := '';
end;

procedure TFForm.ComputeBtnClick(Sender: TObject);
var
  F, prob: Double;
  df1, df2: Integer;
begin
  if not MyTryStrToFloat(FEdit.Text, F) then
  begin
    FEdit.SetFocus;
    ErrorMsg('No valid number.');
    exit;
  end;

  if not TryStrToInt(DF1Edit.Text, df1) then
  begin
    DF1Edit.SetFocus;
    ErrorMsg('No valid integer (must be positive).');
    exit;
  end;

  if not TryStrToInt(DF2Edit.Text, df2) then
  begin
    DF2Edit.SetFocus;
    ErrorMsg('No valid integer (must be positive).');
    exit;
  end;

  prob := ProbF(F, df1, df2);
  ProbEdit.Text := Format('%6.4f', [prob]);
end;

procedure TFForm.FormActivate(Sender: TObject);
var
  w: Integer;
begin
  w := MaxValue([CancelBtn.Width, ResetBtn.Width, ReturnBtn.Width, ComputeBtn.Width]);
  CancelBtn.Constraints.MinWidth := w;
  ResetBtn.Constraints.MinWidth := w;
  ComputeBtn.Constraints.MinWidth := w;
  ReturnBtn.Constraints.MinWidth := w;
end;


end.