unit1.pas

delphi编程实效百例的随书源代码 这是其中的界面外观部分

unit Unit1;

interface

uses
  SysUtils, Types, Classes, QGraphics, QControls, QForms, QDialogs,
  QStdCtrls, QComCtrls;

type
  TForm1 = class(TForm)
    ProgressBar1: TProgressBar;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.xfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  i:integer;
begin
  ProgressBar1.Step:=1;
  //设置进度条的步长
  ProgressBar1.Min:=0;
  //设置进度条的起始值
  ProgressBar1.Max:=100;
  //设置进度条的结束值
  ProgressBar1.Smooth:=True;
  //让进度条平滑
  for i:=0 to 100 do
  begin
    case i of
      0..25: ProgressBar1.FillColor:=clred;
      //当进度低于25％时显示红色
      26..50: ProgressBar1.FillColor:=clblack;
      //进度介于25％到50％之间时显示黑色
      51..75: ProgressBar1.FillColor:=clBlue;
      //进度介于50％到75％之间时显示蓝色
      76..100: ProgressBar1.FillColor:=clYellow;
      //进度大于75％时显示黄色
    end;
    ProgressBar1.StepIt;
    sleep(100);
  end;
end;

end.