在运行时创建的对象上的双击事件-Delphi

Question

I have created a simple Delphi form with a button that, when pressed, creates a label object in run time. I have created an on double click event for the label that shows a message to the screen. The problem is that after creating the label, I have to double click on the form before the double click event works on the label. Obviously this is not ideal as I would like to be able to double click on the label and trigger the event without having to first double click the form.

Here is the code for my form:

unit Unit4;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm4 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormDblClick(Sender: TObject);
    procedure MyLabelDblClick(Sender:TObject);
  private
    { Private declarations }
    LabelObject: TLabel;
  public
    { Public declarations }
  end;

var
  Form4: TForm4;

implementation

{$R *.dfm}

procedure TForm4.Button1Click(Sender: TObject);
begin
  LabelObject := TLabel.Create(Self);
  LabelObject.Left := 100;
  LabelObject.Top := 100;
  LabelObject.Width := 200;
  LabelObject.Height := 20;
  LabelObject.Visible := True;
  LabelObject.Parent := Self;
  LabelObject.Caption := 'My Run Time Label';
  LabelObject.Cursor := crHandPoint;
end;

procedure TForm4.FormDblClick(Sender: TObject);
begin
  LabelObject.OnDblClick := MyLabelDblClick;
end;

procedure TForm4.MyLabelDblClick(Sender: TObject);
begin
  showmessage('You double clicked My Run Time Label');
end;

end.

Thanks in advance for any help with this matter.

Answer 1

The problem is that after creating the label, I have to double click on the form before the double click event works on the label.

Assign LabelObject.OnDblClick when creating the label, ie inside the Button1Click event.