Umgang mit zwei, drei, vier Finger-Swipe-Gesten in WinRT App

Question

Ich habe den folgenden Code:

private Point initialpoint; 

private void ManipulationStarted(object sender, ManipulationStartedRoutedEventArgs e) 
{ 
    initialpoint = e.Position; 
} 

private void ManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e) 
{ 
    Point currentpoint = e.Position; 
    if (currentpoint.X - initialpoint.X >= 100) 
    { 
     System.Diagnostics.Debug.WriteLine("Swipe Right"); 
     e.Complete(); 
    } 
} 

ich sehr leicht 1 Finger-Wischgeste umgehen kann, aber ich möchte 3 2, zu handhaben, 4 Finger Swipe Gesten auch. Kann mir jemand sagen, wie ich das mache?

Answer 1

Gemäß dieser MSDN Forum Posting müssen Sie pointer Benachrichtigungen verwenden. Die Dokumentation mit Beispielcode arbeitet residiert im MSDN Library

Von letzter Verbindung:

Ein Zeiger-Objekt stellt einen einzelnen, einzigartiger Eingang „Kontakt“ (a PointerPoint) von einer Eingabeeinrichtung (wie beispielsweise einen Maus, Stift/Stift, einzelner Finger oder mehrere Finger). Das System erstellt einen Zeiger, wenn ein Kontakt zum ersten Mal erkannt wird, und zerstört es, wenn der Zeiger den Erfassungsbereich verlässt (verlässt) oder abgebrochen wird. Bei mehreren Geräten oder Multi-Touch-Eingaben wird jeder Kontakt als eindeutiger Zeiger behandelt.

---

Nur ein Nachteil, ich habe nicht ein Multi-Touch-Windows 8-Gerät auf diesen Code zu testen. Es wurde also im Simuator mit all seinen Einschränkungen getestet, und wie in den obigen Links erwähnt, hat Windows 8 keine eingebaute Gestenunterstützung, um mehrere Finger zu erkennen, die Sie mit Funktionen auf niedrigerer Ebene verwenden müssen.

Zuerst habe ich zwei weitere Wörterbücher zum obigen MSDN-Beispielcode und zwei Variablen für Ihren Swipe-Schwellenwert zu den Klassendefinitionen hinzugefügt.

Dictionary<uint, Point> startLocation; 
Dictionary<uint, bool> pointSwiped; 
int swipeThresholdX = 100; 
int swipeThresholdY = 100; 

ich initialisieren dann die Dictionarys in der Konstrukteurs-Formular

startLocation = new Dictionary<uint, Point>((int)SupportedContacts.Contacts); 
pointSwiped = new Dictionary<uint, bool>((int)SupportedContacts.Contacts); 

Dann jeden Ort, der das Original-Wörterbuch hinzugefügt wurde oder hatte ein Element entfernt ich das gleiche mit dem neuen Dictionary tat

Zugabe:

startLocation[pt.PointerId] = pt.Position; 
pointSwiped[pt.PointerId] = false; 

Entfernung:

startLocation.Remove(pt.PointerId); 
pointSwiped.Remove(pt.PointerId); 

Dann legte sie schließlich zusammen im PointerMovedEvent:

private void targetContainer_PointerMoved(object sender, PointerRoutedEventArgs e) 
{ 
    Windows.UI.Input.PointerPoint currentPoint = e.GetCurrentPoint(targetContainer); 
    if (currentPoint.IsInContact) 
    { 
     if (startLocation.ContainsKey(currentPoint.PointerId)) 
     { 
      Point startPoint = startLocation[currentPoint.PointerId]; 
      if (Math.Abs(currentPoint.Position.X - startPoint.X) > swipeThresholdX) // I only did one Axis for testing 
      { 
       pointSwiped[currentPoint.PointerId] = true; 
      } 
     } 
    } 
    updateInfoPop(e); 
}    

endmodifiziertes MSDN Beispiel:

using System; 
using System.Collections.Generic; 
using System.IO; 
using System.Linq; 
using Windows.Foundation; 
using Windows.Foundation.Collections; 
using Windows.UI.Xaml; 
using Windows.UI.Xaml.Controls; 
using Windows.UI.Xaml.Controls.Primitives; 
using Windows.UI.Xaml.Data; 
using Windows.UI.Xaml.Input; 
using Windows.UI.Xaml.Media; 
using Windows.UI.Xaml.Navigation; 

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238 

namespace PointerInput 
{ 
    /// <summary> 
    /// An empty page that can be used on its own or navigated to within a Frame. 
    /// </summary> 
    public sealed partial class MainPage : Page 
    { 
     Windows.Devices.Input.TouchCapabilities SupportedContacts = new Windows.Devices.Input.TouchCapabilities(); 

     uint numActiveContacts; 
     Dictionary<uint, Windows.UI.Input.PointerPoint> contacts; 
     Dictionary<uint, Point> startLocation; 
     Dictionary<uint, bool> pointSwiped; 
     int swipeThresholdX = 100; 
     int swipeThresholdY = 100; 

     public MainPage() 
     { 
      this.InitializeComponent(); 
      numActiveContacts = 0; 
      contacts = new Dictionary<uint, Windows.UI.Input.PointerPoint>((int)SupportedContacts.Contacts); 
      startLocation = new Dictionary<uint, Point>((int)SupportedContacts.Contacts); 
      pointSwiped = new Dictionary<uint, bool>((int)SupportedContacts.Contacts); 
      targetContainer.PointerPressed += new PointerEventHandler(targetContainer_PointerPressed); 
      targetContainer.PointerEntered += new PointerEventHandler(targetContainer_PointerEntered); 
      targetContainer.PointerReleased += new PointerEventHandler(targetContainer_PointerReleased); 
      targetContainer.PointerExited += new PointerEventHandler(targetContainer_PointerExited); 
      targetContainer.PointerCanceled += new PointerEventHandler(targetContainer_PointerCanceled); 
      targetContainer.PointerCaptureLost += new PointerEventHandler(targetContainer_PointerCaptureLost); 
      targetContainer.PointerMoved += new PointerEventHandler(targetContainer_PointerMoved); 
     } 

     // PointerPressed and PointerReleased events do not always occur in pairs. 
     // Your app should listen for and handle any event that might conclude a pointer down action 
     // (such as PointerExited, PointerCanceled, and PointerCaptureLost). 
     void targetContainer_PointerPressed(object sender, PointerRoutedEventArgs e) 
     { 
      if (Convert.ToBoolean(SupportedContacts.TouchPresent) && (numActiveContacts > SupportedContacts.Contacts)) 
      { 
       // cannot support more contacts 
       eventLog.Text += "\nNumber of contacts exceeds the number supported by the device."; 
       return; 
      } 

      Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(targetContainer); 

      // Update event sequence. 
      eventLog.Text += "\nDown: " + pt.PointerId; 

      // Change background color of target when pointer contact detected. 
      targetContainer.Fill = new SolidColorBrush(Windows.UI.Colors.Green); 

      // Check if pointer already exists (if enter occurred prior to down). 
      if (contacts.ContainsKey(pt.PointerId)) 
      { 
       return; 
      } 
      contacts[pt.PointerId] = pt; 
      startLocation[pt.PointerId] = pt.Position; 
      pointSwiped[pt.PointerId] = false; 
      ++numActiveContacts; 
      e.Handled = true; 

      // Display pointer details. 
      createInfoPop(e); 
     } 

     private void targetContainer_PointerEntered(object sender, PointerRoutedEventArgs e) 
     { 
      Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(targetContainer); 

      // Update event sequence. 
      eventLog.Text += "\nOver: " + pt.PointerId; 

      if (contacts.Count == 0) 
      { 
       // Change background color of target when pointer contact detected. 
       targetContainer.Fill = new SolidColorBrush(Windows.UI.Colors.Blue); 
      } 

      // Check if pointer already exists (if enter occurred prior to down). 
      if (contacts.ContainsKey(pt.PointerId)) 
      { 
       return; 
      } 

      // Push new pointer Id onto expando target pointers array. 
      contacts[pt.PointerId] = pt; 
      startLocation[pt.PointerId] = pt.Position; 
      pointSwiped[pt.PointerId] = false; 
      ++numActiveContacts; 
      e.Handled = true; 

      // Display pointer details. 
      createInfoPop(e); 
     } 

     // Fires for for various reasons, including: 
     // - User interactions 
     // - Programmatic caputre of another pointer 
     // - Captured pointer was deliberately released 
     // PointerCaptureLost can fire instead of PointerReleased. 
     private void targetContainer_PointerCaptureLost(object sender, PointerRoutedEventArgs e) 
     { 
      Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(targetContainer); 

      // Update event sequence. 
      eventLog.Text += "\nPointer capture lost: " + pt.PointerId; 

      if (contacts.ContainsKey(pt.PointerId)) 
      { 
       checkSwipe(); 
       contacts[pt.PointerId] = null; 
       contacts.Remove(pt.PointerId); 
       startLocation.Remove(pt.PointerId); 
       if (pointSwiped.ContainsKey(pt.PointerId)) 
        pointSwiped.Remove(pt.PointerId); 

       --numActiveContacts; 
      } 

      // Update the UI and pointer details. 
      foreach (TextBlock tb in pointerInfo.Children) 
      { 
       if (tb.Name == e.Pointer.PointerId.ToString()) 
       { 
        pointerInfo.Children.Remove(tb); 
       } 
      } 

      if (contacts.Count == 0) 
      { 
       targetContainer.Fill = new SolidColorBrush(Windows.UI.Colors.Black); 
      } 

      e.Handled = true; 
     } 

     // Fires for for various reasons, including: 
     // - A touch contact is canceled by a pen coming into range of the surface. 
     // - The device doesn't report an active contact for more than 100ms. 
     // - The desktop is locked or the user logged off. 
     // - The number of simultaneous contacts exceeded the number supported by the device. 
     private void targetContainer_PointerCanceled(object sender, PointerRoutedEventArgs e) 
     { 
      Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(targetContainer); 

      // Update event sequence. 
      eventLog.Text += "\nPointer canceled: " + pt.PointerId; 

      if (contacts.ContainsKey(pt.PointerId)) 
      { 
       checkSwipe(); 
       contacts[pt.PointerId] = null; 
       contacts.Remove(pt.PointerId); 
       startLocation.Remove(pt.PointerId); 
       if (pointSwiped.ContainsKey(pt.PointerId)) 
        pointSwiped.Remove(pt.PointerId); 

       --numActiveContacts; 
      } 

      // Update the UI and pointer details. 
      foreach (TextBlock tb in pointerInfo.Children) 
      { 
       if (tb.Name == e.Pointer.PointerId.ToString()) 
       { 
        pointerInfo.Children.Remove(tb); 
       } 
      } 

      if (contacts.Count == 0) 
      { 
       targetContainer.Fill = new SolidColorBrush(Windows.UI.Colors.Black); 
      } 

      e.Handled = true; 
     } 

     private void targetContainer_PointerExited(object sender, PointerRoutedEventArgs e) 
     { 
      Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(targetContainer); 

      // Update event sequence. 
      eventLog.Text += "\nPointer exited: " + pt.PointerId; 

      if (contacts.ContainsKey(pt.PointerId)) 
      { 
       checkSwipe(); 
       contacts[pt.PointerId] = null; 
       contacts.Remove(pt.PointerId); 
       startLocation.Remove(pt.PointerId); 
       if (pointSwiped.ContainsKey(pt.PointerId)) 
        pointSwiped.Remove(pt.PointerId); 

       --numActiveContacts; 
      } 

      // Update the UI and pointer details. 
      foreach (TextBlock tb in pointerInfo.Children) 
      { 
       if (tb.Name == e.Pointer.PointerId.ToString()) 
       { 
        pointerInfo.Children.Remove(tb); 
       } 
      } 

      if (contacts.Count == 0) 
      { 
       targetContainer.Fill = new SolidColorBrush(Windows.UI.Colors.Gray); 

      } 
      e.Handled = true; 
     } 

     /// <summary> 
     /// Invoked when this page is about to be displayed in a Frame. 
     /// </summary> 
     /// <param name="e">Event data that describes how this page was reached. The Parameter 
     /// property is typically used to configure the page.</param> 
     protected override void OnNavigatedTo(NavigationEventArgs e) 
     { 
     } 

     void targetContainer_PointerReleased(object sender, PointerRoutedEventArgs e) 
     { 
      foreach (TextBlock tb in pointerInfo.Children) 
      { 
       if (tb.Name == e.Pointer.PointerId.ToString()) 
       { 
        pointerInfo.Children.Remove(tb); 
       } 
      } 

      Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(targetContainer); 

      // Update event sequence. 
      eventLog.Text += "\nUp: " + pt.PointerId; 

      // Change background color of target when pointer contact detected. 
      targetContainer.Fill = new SolidColorBrush(Windows.UI.Colors.Red); 

      if (contacts.ContainsKey(pt.PointerId)) 
      { 
       checkSwipe(); 
       contacts[pt.PointerId] = null; 
       contacts.Remove(pt.PointerId); 
       startLocation.Remove(pt.PointerId); 
       if(pointSwiped.ContainsKey(pt.PointerId)) 
        pointSwiped.Remove(pt.PointerId); 

       --numActiveContacts; 
      } 
      e.Handled = true; 
     } 

     private void targetContainer_PointerMoved(object sender, PointerRoutedEventArgs e) 
     { 
      Windows.UI.Input.PointerPoint currentPoint = e.GetCurrentPoint(targetContainer); 
      if (currentPoint.IsInContact) 
      { 
       if (startLocation.ContainsKey(currentPoint.PointerId)) 
       { 
        Point startPoint = startLocation[currentPoint.PointerId]; 
        if (Math.Abs(currentPoint.Position.X - startPoint.X) > swipeThresholdX) // I only did one Axis for testing 
        { 
         pointSwiped[currentPoint.PointerId] = true; 
        } 
       } 

      } 
      updateInfoPop(e); 
     } 

     int numberOfSwipedFingers() 
     { 
      int count = 0; 
      foreach (var item in pointSwiped) 
      { 
       if (item.Value) { count += 1; } 
      } 
      return count; 
     } 

     void checkSwipe() 
     { 
      int fingers = numberOfSwipedFingers(); 
      if (fingers > 1) 
      { 
       eventLog.Text += "\nNumber of Swiped fingers = " + fingers; 
      } 
      else if (fingers == 1) 
      { 
       eventLog.Text += "\nNumber of Swiped fingers = " + fingers; 
      } 
      if(fingers > 0) 
       pointSwiped.Clear(); 
     }    

     void createInfoPop(PointerRoutedEventArgs e) 
     { 
      Windows.UI.Input.PointerPoint currentPoint = e.GetCurrentPoint(targetContainer); 
      TextBlock pointerDetails = new TextBlock(); 
      pointerDetails.Name = currentPoint.PointerId.ToString(); 
      pointerDetails.Foreground = new SolidColorBrush(Windows.UI.Colors.White); 
      pointerInfo.Children.Add(pointerDetails); 
      pointerDetails.Text = queryPointer(e); 
     } 

     void updateInfoPop(PointerRoutedEventArgs e) 
     { 
      foreach (TextBlock pointerDetails in pointerInfo.Children) 
      { 
       if (pointerDetails.Name == e.Pointer.PointerId.ToString()) 
       { 
        pointerDetails.Text = queryPointer(e); 
       } 
      } 
     } 

     String queryPointer(PointerRoutedEventArgs e) 
     { 
      Windows.UI.Input.PointerPoint currentPoint = e.GetCurrentPoint(targetContainer); 
      String details = ""; 
      switch (e.Pointer.PointerDeviceType) 
      { 
       case Windows.Devices.Input.PointerDeviceType.Mouse: 
        details += "\nPointer type: mouse"; 
        break; 
       case Windows.Devices.Input.PointerDeviceType.Pen: 
        details += "\nPointer type: pen"; 
        if (e.Pointer.IsInContact) 
        { 
         details += "\nPressure: " + currentPoint.Properties.Pressure; 
         details += "\nrotation: " + currentPoint.Properties.Orientation; 
         details += "\nTilt X: " + currentPoint.Properties.XTilt; 
         details += "\nTilt Y: " + currentPoint.Properties.YTilt; 
         details += "\nBarrel button pressed: " + currentPoint.Properties.IsBarrelButtonPressed; 
        } 
        break; 
       case Windows.Devices.Input.PointerDeviceType.Touch: 
        details += "\nPointer type: touch"; 
        details += "\nrotation: " + currentPoint.Properties.Orientation; 
        details += "\nTilt X: " + currentPoint.Properties.XTilt; 
        details += "\nTilt Y: " + currentPoint.Properties.YTilt; 
        break; 
       default: 
        details += "\nPointer type: n/a"; 
        break; 
      } 

      GeneralTransform gt = targetContainer.TransformToVisual(page); 
      Point screenPoint; 

      screenPoint = gt.TransformPoint(new Point(currentPoint.Position.X, currentPoint.Position.Y)); 
      details += "\nPointer Id: " + currentPoint.PointerId.ToString() + 
       "\nPointer location (parent): " + currentPoint.Position.X + ", " + currentPoint.Position.Y + 
       "\nPointer location (screen): " + screenPoint.X + ", " + screenPoint.Y; 
      return details; 
     } 
    } 
} 

Answer 2

ich Antwort von Mark Hall in eine separate Klasse angepasst und mit Seitenhiebe beschäftigen up , unten, links und rechts.Es hat immer noch Probleme, bei denen Sie mehrere Ereignisse Finger zu verschiedenen Zeiten und erhalten und verbessert werden könnte heben kann, auch wenn es für meine Bedürfnisse funktioniert:

public enum DirectionSwiped 
{ 
    None, 
    Up, 
    Down, 
    Left, 
    Right 
} 


public class SwipeEventArgs : EventArgs 
{ 
    public DirectionSwiped Direction { get; set; } 
    public int NumberOfTouches { get; set; } 
} 


public class SwipeGestureDetector 
{ 
    public EventHandler<SwipeEventArgs> SwipeDetected; 




    // How much of the grid needs to be covered by the swipe? 
    private const double SWIPE_THRESHOLD = 0.5; 

    // How much drift is allowed in the opposite axis? 
    private const int ALLOWED_DRIFT = 100; 

    Windows.Devices.Input.TouchCapabilities SupportedContacts = new Windows.Devices.Input.TouchCapabilities(); 

    uint numActiveContacts; 
    Dictionary<uint, Windows.UI.Input.PointerPoint> contacts; 
    Dictionary<uint, Point> startLocation; 
    Dictionary<uint, DirectionSwiped> pointSwiped; 

    private Grid mGrid; 





    public SwipeGestureDetector(Grid grid) 
    { 
     mGrid = grid; 

     numActiveContacts = 0; 
     contacts = new Dictionary<uint, Windows.UI.Input.PointerPoint>((int)SupportedContacts.Contacts); 
     startLocation = new Dictionary<uint, Point>((int)SupportedContacts.Contacts); 
     pointSwiped = new Dictionary<uint, DirectionSwiped>((int)SupportedContacts.Contacts); 
     grid.PointerPressed += new PointerEventHandler(Grid_PointerPressed); 
     grid.PointerEntered += new PointerEventHandler(Grid_PointerEntered); 
     grid.PointerReleased += new PointerEventHandler(Grid_PointerReleased); 
     grid.PointerExited += new PointerEventHandler(Grid_PointerExited); 
     grid.PointerCanceled += new PointerEventHandler(Grid_PointerCanceled); 
     grid.PointerCaptureLost += new PointerEventHandler(Grid_PointerCaptureLost); 
     grid.PointerMoved += new PointerEventHandler(Grid_PointerMoved); 
    } 





    // PointerPressed and PointerReleased events do not always occur in pairs. 
    // Your app should listen for and handle any event that might conclude a pointer down action 
    // (such as PointerExited, PointerCanceled, and PointerCaptureLost). 
    void Grid_PointerPressed(object sender, PointerRoutedEventArgs e) 
    { 
     if (Convert.ToBoolean(SupportedContacts.TouchPresent) && (numActiveContacts > SupportedContacts.Contacts)) 
     { 
      // cannot support more contacts 
      Debug.WriteLine("\nNumber of contacts exceeds the number supported by the device."); 
      return; 
     } 

     Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(mGrid); 

     // Check if pointer already exists (if enter occurred prior to down). 
     if (contacts.ContainsKey(pt.PointerId)) 
     { 
      return; 
     } 
     contacts[pt.PointerId] = pt; 
     startLocation[pt.PointerId] = pt.Position; 
     pointSwiped[pt.PointerId] = DirectionSwiped.None; 
     ++numActiveContacts; 
     e.Handled = true; 
    } 


    private void Grid_PointerEntered(object sender, PointerRoutedEventArgs e) 
    { 
     Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(mGrid); 

     // Check if pointer already exists (if enter occurred prior to down). 
     if (contacts.ContainsKey(pt.PointerId)) 
     { 
      return; 
     } 

     // Push new pointer Id onto expando target pointers array. 
     contacts[pt.PointerId] = pt; 
     startLocation[pt.PointerId] = pt.Position; 
     pointSwiped[pt.PointerId] = DirectionSwiped.None; 
     ++numActiveContacts; 
     e.Handled = true; 

    } 


    // Fires for for various reasons, including: 
    // - User interactions 
    // - Programmatic caputre of another pointer 
    // - Captured pointer was deliberately released 
    // PointerCaptureLost can fire instead of PointerReleased. 
    private void Grid_PointerCaptureLost(object sender, PointerRoutedEventArgs e) 
    { 
     Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(mGrid); 

     if (contacts.ContainsKey(pt.PointerId)) 
     { 
      checkSwipe(); 
      contacts[pt.PointerId] = null; 
      contacts.Remove(pt.PointerId); 
      startLocation.Remove(pt.PointerId); 
      if (pointSwiped.ContainsKey(pt.PointerId)) 
       pointSwiped.Remove(pt.PointerId); 

      --numActiveContacts; 
     } 

     e.Handled = true; 
    } 


    // Fires for for various reasons, including: 
    // - A touch contact is canceled by a pen coming into range of the surface. 
    // - The device doesn't report an active contact for more than 100ms. 
    // - The desktop is locked or the user logged off. 
    // - The number of simultaneous contacts exceeded the number supported by the device. 
    private void Grid_PointerCanceled(object sender, PointerRoutedEventArgs e) 
    { 
     Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(mGrid); 

     if (contacts.ContainsKey(pt.PointerId)) 
     { 
      checkSwipe(); 
      contacts[pt.PointerId] = null; 
      contacts.Remove(pt.PointerId); 
      startLocation.Remove(pt.PointerId); 
      if (pointSwiped.ContainsKey(pt.PointerId)) 
       pointSwiped.Remove(pt.PointerId); 

      --numActiveContacts; 
     } 

     e.Handled = true; 
    } 


    private void Grid_PointerExited(object sender, PointerRoutedEventArgs e) 
    { 
     Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(mGrid); 

     if (contacts.ContainsKey(pt.PointerId)) 
     { 
      checkSwipe(); 
      contacts[pt.PointerId] = null; 
      contacts.Remove(pt.PointerId); 
      startLocation.Remove(pt.PointerId); 
      if (pointSwiped.ContainsKey(pt.PointerId)) 
       pointSwiped.Remove(pt.PointerId); 

      --numActiveContacts; 
     } 
     e.Handled = true; 
    } 



    void Grid_PointerReleased(object sender, PointerRoutedEventArgs e) 
    { 
     Windows.UI.Input.PointerPoint pt = e.GetCurrentPoint(mGrid); 

     if (contacts.ContainsKey(pt.PointerId)) 
     { 
      checkSwipe(); 
      contacts[pt.PointerId] = null; 
      contacts.Remove(pt.PointerId); 
      startLocation.Remove(pt.PointerId); 
      if (pointSwiped.ContainsKey(pt.PointerId)) 
       pointSwiped.Remove(pt.PointerId); 

      --numActiveContacts; 
     } 
     e.Handled = true; 
    } 


    private void Grid_PointerMoved(object sender, PointerRoutedEventArgs e) 
    { 
     Windows.UI.Input.PointerPoint currentPoint = e.GetCurrentPoint(mGrid); 
     if (currentPoint.IsInContact) 
     { 
      if (startLocation.ContainsKey(currentPoint.PointerId)) 
      { 
       Point startPoint = startLocation[currentPoint.PointerId]; 

       // Compare startPoint to current location and determine if that point did a swipe? 

       double horizontalMovement = currentPoint.Position.X - startPoint.X; 
       double verticalMovement = currentPoint.Position.Y - startPoint.Y; 

       double horizontalDistance = Math.Abs(horizontalMovement); 
       double verticalDistance = Math.Abs(verticalMovement); 

       double requiredLeftMovement = mGrid.ActualWidth * SWIPE_THRESHOLD * -1; 
       double requiredRightMovement = mGrid.ActualWidth * SWIPE_THRESHOLD; 

       double requiredUpMovement = mGrid.ActualHeight * SWIPE_THRESHOLD * -1; 
       double requiredDownMovement = mGrid.ActualHeight * SWIPE_THRESHOLD; 

       if (verticalMovement < requiredUpMovement && horizontalDistance < 100) 
       { 
        pointSwiped[currentPoint.PointerId] = DirectionSwiped.Up; 
       } 
       else if (verticalMovement > requiredDownMovement && horizontalDistance < ALLOWED_DRIFT) 
       { 
        pointSwiped[currentPoint.PointerId] = DirectionSwiped.Down; 
       } 
       else if (horizontalMovement > requiredRightMovement && verticalDistance < ALLOWED_DRIFT) 
       { 
        pointSwiped[currentPoint.PointerId] = DirectionSwiped.Right; 
       } 
       else if (horizontalMovement < requiredLeftMovement && verticalDistance < ALLOWED_DRIFT) 
       { 
        pointSwiped[currentPoint.PointerId] = DirectionSwiped.Left; 
       } 
      } 
     } 
    } 





    void checkSwipe() 
    { 
     NotififyListenerIfSwiped(DirectionSwiped.Up); 
     NotififyListenerIfSwiped(DirectionSwiped.Down); 
     NotififyListenerIfSwiped(DirectionSwiped.Left); 
     NotififyListenerIfSwiped(DirectionSwiped.Right); 
    } 


    private void NotififyListenerIfSwiped(DirectionSwiped direction) 
    { 
     int fingers = numberOfSwipedFingers(direction); 
     if (fingers >= 1) 
     { 
      if (SwipeDetected != null) 
      { 
       SwipeDetected(this, new SwipeEventArgs() { Direction = direction, NumberOfTouches = fingers }); 
      } 
     } 

     if (fingers > 0) 
      pointSwiped.Clear(); 
    } 


    int numberOfSwipedFingers(DirectionSwiped direction) 
    { 
     int count = 0; 
     foreach (var item in pointSwiped) 
     { 
      DirectionSwiped swipe = item.Value; 
      if (swipe == direction) 
      { 
       count += 1; 
      } 
     } 
     return count; 
    } 


} 

---

Nutzungs

public void Gesture_Detected(Object sender, SwipeEventArgs e) 
    { 
     Debug.WriteLine("Number of touches: " + e.NumberOfTouches + " Direction: " + e.Direction); 
    } 


    public MainPage() 
    { 
     this.InitializeComponent(); 

     SwipeGestureDetector gestureDetector = new SwipeGestureDetector(this.rootGrid); 
     gestureDetector.SwipeDetected += Gesture_Detected;