一个简单的菜单按钮的实现

使用过速达2000的朋友都知道,其基本资料的浏览界面中有一种按钮,点击后会弹出一个和按钮对得很整齐的菜单.用Delphi制作一个类似的控件十分容易,代码如下:

unit MenuBtnVCL;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
Buttons, CommCtrl,
ExtCtrls,Menus;

type
TMenuBtn = class(TBitBtn)
protected
procedure DoEnter;override;
procedure DoExit;override;
{ Protected declarations }
public
constructor Create(AOwner: TComponent); override;
procedure Click; override;
{ Public declarations }
published
{ AL: }
{ Published declarations }
end;

procedure Register;

implementation

procedure Register;
begin
RegisterComponents('Samples', [TMenuBtn]);
end;

constructor TMenuBtn.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
layout:=blGlyphRight;
Font.Charset := GB2312_CHARSET;
Font.Color := clWindowText;
Font.Height := -12;
Font.Name := '宋体';
end;

procedure TMenuBtn.Click;
var tmp:TPoint;
begin
inherited Click;

if Assigned(PopUpMenu) then
begin
{ calc where to put menu }
tmp := ClientToScreen(Point(0, Height));
PopUpMenu.Popup(tmp.X, tmp.Y);
end;
end;

procedure TMenuBtn.DoEnter;
begin
Font.Style := [fsBold];
inherited DoEnter;
end;

procedure TMenuBtn.DoExit ;
begin
Font.Style := [];
inherited DoExit;
end;

end.