unit Add;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TAddForm = class(TForm)
    LAbout: TLabel;
    Topic: TEdit;
    LTopic: TLabel;
    SecName: TEdit;
    LSecName: TLabel;
    Str: TEdit;
    LStr: TLabel;
    Date: TEdit;
    LDate: TLabel;
    AddButton: TButton;
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
    procedure TopicChange(Sender: TObject);
    procedure AddButtonClick(Sender: TObject);
    procedure SecNameKeyPress(Sender: TObject; var Key: Char);
    procedure StrKeyPress(Sender: TObject; var Key: Char);
    procedure DateKeyPress(Sender: TObject; var Key: Char);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  AddForm: TAddForm;

implementation

Uses
   Base, ChangeMenu, Menu, DeleteRef, Change;

{$R *.dfm}

procedure TAddForm.AddButtonClick(Sender: TObject);
var
   s: String;
   i, kol: Integer;
begin
   kol := 0;
   s := Date.Text;
   for i := 1 to length(s) do
      if s[i] = '.' then
         inc(kol);
   if kol <> 2 then
      MessageDlg('Введите дату в формате день.месяц.год', mtError, [mbOK], 0)
   else
   begin
      Inc(n);
      SetLength(Ref, n);
      Ref[n - 1].Topic := Topic.Text;
      Ref[n - 1].Author := SecName.Text;
      Ref[n - 1].Str := StrToInt(Str.Text);
      Ref[n - 1].Date := Date.Text;
      Topic.Text := '';
      SecName.Text := '';
      Str.Text := '';
      Date.Text := '';
      Seek(MyFile, FileSize(MyFile));
      Write(MyFile, Ref[n - 1]);
      BaseForm.Show;
      AddForm.Hide;
   end;
end;

procedure TAddForm.TopicChange(Sender: TObject);
var
   IsValid1, IsValid2, IsValid3, IsValid4: Boolean;
begin
   if Topic.Text <> '' then
      IsValid1 := True
   else
      IsValid1 := False;
   if SecName.Text <> '' then
      IsValid2 := True
   else
      IsValid2 := False;
   if Str.Text <> '' then
      IsValid3 := True
   else
      IsValid3 := False;
   if Date.Text <> '' then
      IsValid4 := True
   else
      IsValid4 := False;
   if (IsValid1) and (IsValid2) and (IsValid3) and (IsValid4) then
      AddButton.Enabled := True
   else
      AddButton.Enabled := False;
end;

procedure TAddForm.SecNameKeyPress(Sender: TObject; var Key: Char);
const
   NotDigit: set of Char = ['0'..'9', '.', ','];
begin
   with (Sender as TEdit) do
   begin
      if Key in NotDigit then
         Key := #0;
   end;
end;

procedure TAddForm.StrKeyPress(Sender: TObject; var Key: Char);
const
   Digit: set of Char = ['0'..'9', #8];
begin
   with (Sender as TEdit) do
   begin
      if not(Key in Digit) then
         Key := #0;
   end;
end;

procedure TAddForm.DateKeyPress(Sender: TObject; var Key: Char);
const
   Digit: set of Char = ['0'..'9', #8, '.'];
begin
   with (Sender as TEdit) do
   begin
      if not(Key in Digit) then
         Key := #0;
   end;
end;

procedure TAddForm.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
   BaseForm.Show;
   MenuForm.Hide;
   ChangeMenuForm.Hide;
   AddForm.Hide;
   DeleteForm.Hide;
   ChangeForm.Hide;
end;

end.