[TButton]运行时动态创建和删除按钮
2006-02-04 13:52:10 来源:WEB开发网新开一个PRoject,然后拖两个Button放在窗体上
代码如下:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
btnAddButton: TButton;
btnDeleteLast: TButton;
procedure btnAddButtonClick(Sender: TObject);
procedure btnDeleteLastClick(Sender: TObject);
private
{ Private declarations }
procedure CustomButtonClick(Sender: TObject);
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.btnAddButtonClick(Sender: TObject);
var
NewButton: TButton; // 新 Button的指针
begin
// 在内存中创建一个 Button,拥有者为self,这样当窗体 destory时,这个新button
// 能够被自动释放
NewButton := TButton.Create(Self);
With NewButton do
begin
Top := 60; // button 的出现的坐标
Width := 60; // button 的宽度
Left := Width * (Self.ControlCount - 2);
Parent := Self; // 指明在那个窗体显示
OnClick := CustomButtonClick; // 指定button click事件
Caption := 'Button' + IntToStr(Self.ControlCount - 2);
end; // with
end;
procedure TForm1.btnDeleteLastClick(Sender: TObject);
begin
// 确定窗体上有新的button
if Self.ControlCount > 2 then
// 删除最后新建的 button
TButton(Controls[ControlCount - 1]).Destroy;
end;
procedure TForm1.CustomButtonClick(Sender: TObject);
begin
// 根据 Sender 来判断哪个新建的button click
ShowMessage(TButton(Sender).Caption + ' Pressed');
end;
end.
作者:lzcx
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