public bool IsSwipeLeft(Gesture gesture)
{
if (IsLongEnough(gesture, MinSwipeLength) && IsFastEnough(gesture, MinSwipeVelocity) && IsHorizontalEnough(gesture))
{
return gesture.Delta.X < 0;
}
return false;
}
protected virtual void OnGestured(Gesture e)
{
var handler = Gestured;
if (handler != null)
{
handler(this, new GestureEventArgs(this, e));
}
}
public GestureEventArgs(IGestureTracker tracker, Gesture gesture)
{
_gestureTrackers.Add(tracker);
Gesture = gesture;
}
internal static bool IsFastEnough(Gesture gesture, double minSwipeVelocity)
{
var delta = gesture.Velocity;
if (Math.Abs(delta.X) < minSwipeVelocity)
{
return false;
}
return true;
}
internal static bool IsLongEnough(Gesture gesture, double minSwipeLength)
{
var delta = gesture.Delta;
if (Math.Abs(delta.X) < minSwipeLength)
{
return false;
}
return true;
}
private static bool IsCommand(Gesture gesture, RoutedCommand command)
{
return gesture.CommandArgs != null && gesture.CommandArgs.Command == command;
}
private bool IsHorizontalEnough(Gesture gesture)
{
var xs = new double[] { gesture.Delta.X, gesture.Velocity.X };
var ys = new double[] { gesture.Delta.Y, gesture.Velocity.Y };
for (int i = 0; i < 2; i++)
{
if (Math.Abs(xs[i]) < (2 * Math.Abs(ys[i])))
{
return false;
}
}
return true;
}
