MouseEnter/Leave bei Pie

[Bummi]

Ich weiß nicht wo genau es hängt, vielleicht hilft hilft Dir diese Minibeispiel weiter

Delphi-Quellcode:

unit Unit6;

interface

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

type
 TPaintBox = class(ExtCtrls.TPaintBox)
  private
    FOnMouseEnter,
    FOnMouseLeave: TNotifyEvent;
    procedure CMMouseEnter (var mMsg : TMessage); message CM_MouseEnter;
    procedure CMMouseLeave (var mMsg : TMessage); message CM_MouseLeave;
  published
    property OnMouseEnter: TNotifyEvent READ FOnMouseEnter WRITE FOnMouseEnter;
    property OnMouseLeave: TNotifyEvent READ FOnMouseLeave WRITE FOnMouseLeave;
  end;

  TForm6 = class(TForm)
    PaintBox1: TPaintBox;
    PaintBox2: TPaintBox;
    procedure FormCreate(Sender: TObject);
    procedure PaintBox1Paint(Sender: TObject);
  private
    procedure MyMouseEnter(Sender: TObject);
    procedure MyMouseLeave(Sender: TObject);
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form6: TForm6;

implementation

{$R *.dfm}

{ TPaintBox }

procedure TPaintBox.CMMouseEnter(var mMsg: TMessage);
begin
  inherited;
  if Assigned(OnMouseEnter) then OnMouseEnter(self);

end;

procedure TPaintBox.CMMouseLeave(var mMsg: TMessage);
begin
  if Assigned(OnMouseLeave) then OnMouseLeave(self);
end;

procedure TForm6.MyMouseEnter(Sender: TObject);
begin
   With TPaintbox(Sender) do
    begin
      Tag := clLime;
      Invalidate;
    end;
end;
procedure TForm6.MyMouseLeave(Sender: TObject);
begin
   With TPaintbox(Sender) do
    begin
      Tag := clRed;
      Invalidate;
    end;

end;

procedure TForm6.PaintBox1Paint(Sender: TObject);// ist auch Paintbox2 zugewiesen
begin
  With TPaintBox(Sender).Canvas  do
    begin
      Brush.Color := TPaintBox(Sender).Tag;
      Fillrect(TPaintBox(Sender).ClientRect);
    end;
end;

procedure TForm6.FormCreate(Sender: TObject);
begin
 Paintbox1.OnMouseEnter := MyMouseEnter;
 Paintbox1.OnMouseLeave := MyMouseLeave;
 Paintbox2.OnMouseEnter := MyMouseEnter;
 Paintbox2.OnMouseLeave := MyMouseLeave;

end;

end.