Bei TImage Bild wechseln, wenn mit Maus darüber

[Nightshade]

Für den Zweck habe ich mir mal eine Komponente gebaut :

Delphi-Quellcode:

unit MyImage;

interface

uses
  SysUtils, Classes, Controls, ExtCtrls, Graphics, Messages;

type TMyImage =class(TImage)
  private
    FOnMouseEnter: TNotifyEvent;
    FOnMouseLeave: TNotifyEvent;
    FMLPic: TPicture;
    FMEPic: TPicture;
    procedure CMMouseEnter(var Message: TMessage); message CM_MOUSEENTER;
    procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
    procedure SetMEPic(const Value: TPicture);
    procedure SetMLPic(const Value: TPicture);
  protected
  public
    constructor Create(AOwner : TComponent); override;
    destructor Destroy; override;
  published
    property OnMouseEnter : TNotifyEvent read FOnMouseEnter Write FOnMouseEnter;
    property OnMouseLeave : TNotifyEvent read FOnMouseLeave Write FOnMouseLeave;
    property MouseEnterPicture : TPicture read FMEPic write SetMEPic;
    property MouseLeavePicture : TPicture read FMLPic write SetMLPic;
end;

procedure Register;

implementation

procedure Register;
begin
  RegisterComponents('Beispiele', [TMyImage]);
end;

{ TMyImage }

procedure TMyImage.CMMouseEnter(var Message: TMessage);
begin
  if Message.Msg=CM_MOUSEENTER then begin
    if csDesigning in ComponentState then begin
      if FMLPic <> NIL then picture.Assign(FMLPic);
    end
    else begin
      if FMEPic <> NIL then picture.Assign(FMEPic);
    end;
    if ( Assigned(FOnMouseEnter) ) then FOnMouseEnter(self);
    repaint;
  end;
end;

procedure TMyImage.CMMouseLeave(var Message: TMessage);
begin
  if Message.Msg=CM_MOUSELEAVE then begin
    if FMLPic <> NIL then picture.Assign(FMLPic);
    if ( Assigned(FOnMouseLeave) ) then FOnMouseLeave(self);
    repaint;
  end;
end;

constructor TMyImage.Create(AOwner: TComponent);
begin
  inherited;
  FMLPic := TPicture.Create;
  FMEPic := TPicture.Create;
end;

destructor TMyImage.Destroy;
begin
  FreeAndNil(FMLPic);
  FreeAndNil(FMEPic);
  inherited;
end;

procedure TMyImage.SetMEPic(const Value: TPicture);
begin
  FMEPic.Assign(Value);
end;

procedure TMyImage.SetMLPic(const Value: TPicture);
begin
  FMLPic.Assign(Value);
end;


end.

Villeicht hilft dir das weiter ...

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Nightshade