unit1.~pas

该例子讲解delphi的构件编程方法

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, Buttons;

type

  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Memo1: TMemo;
    Button3: TButton;
    Timer1: TTimer;
    BitBtn1: TBitBtn;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);

  private
    { Private declarations }
    procedure DoWith_OnMouseMove(Sender: TObject; Shift: TShiftState; X,
      Y: Integer);
    procedure DoWith_OnEvents(Sender: TObject);
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  ABtn:TButton;

begin
  ABtn:=TButton.Create(self);
  ABtn.Parent:=self;
  ABtn.Left:=100;
  ABtn.Top:=160;
  ABtn.Caption:='Click me';

  ABtn.OnClick:=self.DoWith_OnEvents;


end;

procedure TForm1.Button2Click(Sender: TObject);
var
  AForm:TForm;
begin
//  self.Button1.Visible:=false;

  AForm:=TForm.Create(self);

  AForm.Parent:=nil;
  AForm.Caption:='I am a Form';
  AForm.ShowModal;

//  AForm.Free;
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  ATimer:TTimer;
begin
  ATimer:=TTimer.Create(self);
  ATimer.Interval:=6000;
  ATimer.OnTimer:=self.DoWith_OnEvents;

  self.OnMouseMove:=self.DoWith_OnMouseMove;
end;

procedure TForm1.DoWith_OnEvents(Sender: TObject);

begin
  
  if Sender is TTimer then self.Caption:=datetimetostr(now);
  if Sender is TButton then showmessage((Sender as TButton).Caption);
end;

procedure TForm1.DoWith_OnMouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
  self.Caption:=inttostr(x)+','+inttostr(y);
end;

end.