2019-11-29-WPF-开启-ScrollViewer-的触摸滚动

    public class StisvearpaHudalserevow : ScrollViewer
    {
        /// inheritdoc />
        protected override void OnManipulationDelta(ManipulationDeltaEventArgs e)
        {
            Debug.WriteLine("OnManipulationDelta");
            base.OnManipulationDelta(e);
        }

        /// inheritdoc />
        protected override void OnManipulationCompleted(ManipulationCompletedEventArgs e)
        {
            Debug.WriteLine("OnManipulationCompleted");
            base.OnManipulationCompleted(e);
        }

        /// inheritdoc />
        protected override void OnManipulationStarted(ManipulationStartedEventArgs e)
        {
            Debug.WriteLine("OnManipulationStarted");
            base.OnManipulationStarted(e);
        }
    }

local:StisvearpaHudalserevow IsManipulationEnabled="True">

       /// summary>
        ///     Method which sets IsManipulationEnabled
        ///     property based on the PanningMode
        /// summary>
        private void OnPanningModeChanged()
        {
            PanningMode mode = PanningMode;
 
            // Call InvalidateProperty for IsManipulationEnabledProperty
            // to reset previous SetCurrentValueInternal if any. 
            // Then call SetCurrentValueInternal to
            // set the value of these properties if needed.
            InvalidateProperty(IsManipulationEnabledProperty);
 
            if (mode != PanningMode.None)
            {
                SetCurrentValueInternal(IsManipulationEnabledProperty, BooleanBoxes.TrueBox);
            }
        }

        protected override void OnManipulationStarted(ManipulationStartedEventArgs e)
        {
            Debug.WriteLine("OnManipulationStarted");
            base.OnManipulationStarted(e);

            Task.Delay(TimeSpan.FromSeconds(3)).ContinueWith(_ => IsManipulationEnabled = false,
                TaskScheduler.FromCurrentSynchronizationContext());
        }