ein OnHover nachbauen / benutzen

[Sprint]

Du brauchst doch nur die Nachrichten von TImage und TLabel an Parent weiterreichen.

Delphi-Quellcode:

unit Unit1;

interface

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

type
  TPanel = class(ExtCtrls.TPanel)
  private
    FOnMouseLeave: TNotifyEvent;
    FOnMouseEnter: TNotifyEvent;
    procedure CMMouseEnter(var Message: TMessage); message CM_MOUSEENTER;
    procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
  public
    property OnMouseEnter: TNotifyEvent read FOnMouseEnter write FOnMouseEnter;
    property OnMouseLeave: TNotifyEvent read FOnMouseLeave write FOnMouseLeave;
  end;

  TLabel = class(StdCtrls.TLabel)
  private
    procedure CMMouseEnter(var Message: TMessage); message CM_MOUSEENTER;
    procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
  end;

  TImage = class(ExtCtrls.TImage)
  private
    procedure CMMouseEnter(var Message: TMessage); message CM_MOUSEENTER;
    procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
  end;

  TForm1 = class(TForm)
    Panel1: TPanel;
    Label1: TLabel;
    Image1: TImage;
    procedure FormCreate(Sender: TObject);
  private
    { Private-Deklarationen }
    procedure PanelOnMouseEnter(Sender: TObject);
    procedure PanelOnMouseLeave(Sender: TObject);
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{ TPanel }

procedure TPanel.CMMouseEnter(var Message: TMessage);
begin
  if Assigned(FOnMouseEnter) then 
    FOnMouseEnter(Self);
end;

procedure TPanel.CMMouseLeave(var Message: TMessage);
begin
  if Assigned(FOnMouseLeave) then
    FOnMouseLeave(Self);
end;

{ TLabel }

procedure TLabel.CMMouseEnter(var Message: TMessage);
begin
  if Assigned(Parent) then
    Parent.Perform(CM_MOUSEENTER, 0, 0);
end;

procedure TLabel.CMMouseLeave(var Message: TMessage);
begin
  if Assigned(Parent) then
    Parent.Perform(CM_MOUSELEAVE, 0, 0);
end;

{ TImage }

procedure TImage.CMMouseEnter(var Message: TMessage);
begin
  if Assigned(Parent) then
    Parent.Perform(CM_MOUSEENTER, 0, 0);
end;

procedure TImage.CMMouseLeave(var Message: TMessage);
begin
  if Assigned(Parent) then
    Parent.Perform(CM_MOUSELEAVE, 0, 0);
end;

{ TForm1 }

procedure TForm1.PanelOnMouseEnter(Sender: TObject);
begin
  TPanel(Sender).Color := clHighlight;
end;

procedure TForm1.PanelOnMouseLeave(Sender: TObject);
begin
  TPanel(Sender).Color := clBtnFace;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Panel1.OnMouseEnter := PanelOnMouseEnter;
  Panel1.OnMouseLeave := PanelOnMouseLeave;
end;

end.