delphi Controls Components 属性

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
 
type
  TForm1 = class(TForm)
    mmo1: TMemo;
    scrlbx1: TScrollBox;
    btn1: TButton;
    btn2: TButton;
    edt1: TEdit;
    procedure FormCreate(Sender: TObject);
    procedure btn1Click(Sender: TObject);
    procedure btn2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
procedure TForm1.FormCreate(Sender: TObject);
var
  i:Integer;
  edtTmp :TEdit;
begin
  for i:=0 to 5 do
  begin
     edtTmp := TEdit.Create(scrlbx1);
     edtTmp.Parent := scrlbx1;
     edtTmp.Text := 'edtText'+ IntToStr(i);
     edtTmp.Name := 'edtName'+ IntToStr(i);
     edtTmp.Left := 5;
     edtTmp.Top := edtTmp.Height*i + 5;
  end;
end;
 
procedure TForm1.btn1Click(Sender: TObject);
var
  i: Integer;
begin
  //ComponentCount  表示该组件拥有的子组件数据   //Components 可以访问该组件拥有的任何子组件
  mmo1.Lines.Add('控件scrlbx1拥有组件数为:'+inttostr(scrlbx1.ComponentCount)+'  组件名分别为：');
  for i:= 0 to scrlbx1.ComponentCount -1 do
  begin
    mmo1.Lines.Add(scrlbx1.Components[i].Name);         // 这里不会显示edt1的name 因为它不属于scrlbx1
  end;
end;
 
procedure TForm1.btn2Click(Sender: TObject);
var
  i: Integer;
begin
   mmo1.Lines.Add('控件scrlbx1所有组件数为:'+inttostr(scrlbx1.ControlCount));
  //ControlCount  表示该组件所有(不是拥有，放在该组件上面的都算所有)的子组件数据
  for i:= 0 to scrlbx1.ControlCount - 1 do
  begin
    if scrlbx1.Controls[i] is TEdit then
    begin
      TEdit(scrlbx1.Controls[i]).Clear;      //这里会清除edt1 里的内容
    end;
  end;
 
end;
 
end.