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unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TPropValueChange = procedure (OldValue, NewValue: string) of object;
TMaClasse = class(TComponent)
private
FPropValue: string;
FPropValueChange: TPropValueChange;
procedure SetPropValue(const Value: string);
public // ou published si tu veux faire un composant
property PropValue: string read FPropValue write SetPropValue;
property PropValueChange: TPropValueChange read FPropValueChange write FPropValueChange;
end;
TForm1 = class(TForm)
Button1: TButton;
Edit1: TEdit;
procedure Button1Click(Sender: TObject);
private
procedure MaPropValueChange(OldValue, NewValue: string);
public
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var
M: TMaClasse;
begin
M := TMaClasse.Create(Self);
M.PropValueChange := MaPropValueChange;
M.PropValue := 'loooooooooooooool';
FreeAndNil(M);
end;
procedure TForm1.MaPropValueChange(OldValue, NewValue: string);
begin
Edit1.Text := NewValue;
end;
{ TMaClasse }
procedure TMaClasse.SetPropValue(const Value: string);
begin
if FPropValue = Value then Exit;
if Assigned(FPropValueChange) then
FPropValueChange(FPropValue, Value);
FPropValue := Value;
end;
end. |
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