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unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
ComboBox1: TComboBox;
Button1: TButton;
procedure Button1Click(Sender: TObject);
procedure onvaluechange(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
Fvchange:TNotifyEvent;
{ Private declarations }
public
{ Public declarations }
published
property valuechange:TNotifyevent read Fvchange write Fvchange;
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.onvaluechange(Sender: TObject);
begin
if combobox1.Text<>'t' then
showmessage('sdfasdf');
end;
procedure TForm1.Button1Click(Sender: TObject); //给combobox1.text赋值
begin
combobox1.Text:='ee';
if assigned(Fvchange) then valuechange(Self);
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
Fvchange:= onvaluechange;
end;
end.