windows - Windows ストア アプリのピンチ ズームの処理

Question

GestureRecognizer に関するmsdnの指示に従いました。ピンチゲスチャー対応用。しかし、私はManipulationUpdated呼ばれることができません。足りないものはありますか？

私のC#クラスでは、

    `private GestureRecognizer gesture = new GestureRecognizer();`

私のコンストラクタで：

    gesture.GestureSettings = GestureSettings.ManipulationScale;
    gesture.ManipulationUpdated += gesture_ManipulationUpdated;
    gesture.ManipulationStarted += gesture_ManipulationStarted;
    gesture.ManipulationCompleted += gesture_ManipulationCompleted;

私のポインターイベントでは：

 private void PointerPressed_1(object sender, PointerRoutedEventArgs e)
{
   var point = e.GetIntermediatePoints(null);
   gesture.ProcessDownEvent(point[0]);
}

private void PointerMoved_1(object sender, PointerRoutedEventArgs e)
{
   gesture.ProcessMoveEvents(e.GetIntermediatePoints(null));
}

private void PointerReleased_1(object sender, PointerRoutedEventArgs e)
{
    var point = e.GetIntermediatePoints(null);
    gesture.ProcessUpEvent(point[0]);
    gesture.CompleteGesture();
}

void gesture_ManipulationCompleted(GestureRecognizer sender, ManipulationCompletedEventArgs args)
    {
        System.Diagnostics.Debug.WriteLine("Manipulation Completed {0}", args.Cumulative.Scale);
    }

void gesture_ManipulationStarted(GestureRecognizer sender, ManipulationStartedEventArgs args)
    {
        System.Diagnostics.Debug.WriteLine("Manipulation Started {0}", args.Cumulative.Scale);
    }

void gesture_ManipulationUpdated(GestureRecognizer sender, ManipulationUpdatedEventArgs args)
    {
        System.Diagnostics.Debug.WriteLine("Manipulation Updated {0}", args.Cumulative.Scale);
    }