德尔福进度条

Question

我正在尝试创建一个从0%开始的进度条,需要5秒才能达到100%.单击Button1后,进度条将开始上升.有什么建议？我看了谷歌,但这对我这件事没什么好处.

此外,在0%时,应该有一个标签Waiting...,当进度条开始时,它应该转到Working...,当它完成时,它应该说Done!.

Answer 1

您可以使用间隔为50的计时器,并首先将enabled设置为false.

procedure TForm1.Button1Click(Sender: TObject);
begin
  timer1.Enabled := True;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
const
  cnt: integer = 1;
begin
  ProgressBar1.Position := cnt;
  if cnt = 1 then Label1.Caption := 'Waiting...'
  else if cnt = 100 then begin
    Label1.Caption := 'Done!';
    Timer1.Enabled := False;
  end else
    Label1.Caption := 'Working...';
  Inc(cnt);
end;

Answer 2

使用GetTickCount()和初始化变量:

uses Windows;

var mseconds, starttime: integer;


procedore TForm1.FormCreate()
begin
  starttime := GetTickCount();
  mseconds := 0;
  Timer1.Enabled := false;
  Label1.Caption := '';
  ProgressBar1.Position := 0;
  Label1.Caption := 'Waiting...';
end;

procedure TForm1.Button1Click(Sender: TObject);
begin  
  ProgressBar1.Min := 0;
  ProgressBar.Max := 100;
  ProgressBar1.Position := 0;
  timer1.Enabled := True;
  Label1.Caption := 'Working...';  
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin  
  mseconds := GetTickCount() - starttime;
  if mseconds < 5000 then
    ProgressBar1.Position := Trunc(mseconds / 50)
  else begin
    ProgressBar1.Position := 100;
    Label1.Caption := 'Done!';
    Timer1.Enabled := false;
  end;
end;