public InertiaProcessor(Manipulation owner, Point position, ManipulationDelta cumulative, ManipulationVelocities velocities)
{
_owner = owner;
_position0 = position;
_cumulative0 = cumulative;
_velocities0 = velocities;
_isTranslateInertiaXEnabled = _owner._isTranslateXEnabled &&
_owner._settings.HasFlag(Input.GestureSettings.ManipulationTranslateInertia) &&
Abs(velocities.Linear.X) > _owner._inertiaThresholds.TranslateX;
_isTranslateInertiaYEnabled = _owner._isTranslateYEnabled &&
_owner._settings.HasFlag(Input.GestureSettings.ManipulationTranslateInertia) &&
Abs(velocities.Linear.Y) > _owner._inertiaThresholds.TranslateY;
_isRotateInertiaEnabled = _owner._isRotateEnabled &&
_owner._settings.HasFlag(Input.GestureSettings.ManipulationRotateInertia) &&
Abs(velocities.Angular) > _owner._inertiaThresholds.Rotate;
_isScaleInertiaEnabled = _owner._isScaleEnabled &&
_owner._settings.HasFlag(Input.GestureSettings.ManipulationScaleInertia) &&
Abs(velocities.Expansion) > _owner._inertiaThresholds.Expansion;
global::System.Diagnostics.Debug.Assert(_isTranslateInertiaXEnabled || _isTranslateInertiaYEnabled || _isRotateInertiaEnabled || _isScaleInertiaEnabled);
// For better experience, as soon inertia kicked-in on an axis, we bypass threshold on the second axis.
_isTranslateInertiaXEnabled |= _isTranslateInertiaYEnabled && _owner._isTranslateXEnabled;
_isTranslateInertiaYEnabled |= _isTranslateInertiaXEnabled && _owner._isTranslateYEnabled;
_timer = DispatcherQueue.GetForCurrentThread().CreateTimer();
_timer.Interval = TimeSpan.FromMilliseconds(1000d / _framesPerSecond);
_timer.IsRepeating = true;
_timer.Tick += (snd, e) => Process(snd.LastTickElapsed.TotalMilliseconds);
}
internal ManipulationCompletedEventArgs(
PointerIdentifier[] pointers,
Point position,
ManipulationDelta cumulative,
ManipulationVelocities velocities,
bool isInertial,
uint contactCount,
uint currentContactCount)
{
global::System.Diagnostics.Debug.Assert(pointers.Length > 0 && pointers.All(p => p.Type == pointers[0].Type));
Pointers = pointers;
Position = position;
Cumulative = cumulative;
Velocities = velocities;
IsInertial = isInertial;
ContactCount = contactCount;
CurrentContactCount = currentContactCount;
}
internal ManipulationInertiaStartingEventArgs(
PointerIdentifier[] pointers,
Point position,
ManipulationDelta delta,
ManipulationDelta cumulative,
ManipulationVelocities velocities,
uint contactCount,
GestureRecognizer.Manipulation.InertiaProcessor processor)
{
global::System.Diagnostics.Debug.Assert(pointers.Length > 0 && pointers.All(p => p.Type == pointers[0].Type));
Pointers = pointers;
PointerDeviceType = pointers[0].Type;
Position = position;
Delta = delta;
Cumulative = cumulative;
Velocities = velocities;
ContactCount = contactCount;
Processor = processor;
}
protected virtual GestureEnd EndMove(bool isInertial, ManipulationDelta cumulative, ManipulationVelocities velocities, Point position)
{
this.dragLock = DragLock.Unset;
this.dragging = false;
double angle = 0.0;
if (isInertial)
{
angle = GestureService.AngleFromVector(velocities.Linear.X, velocities.Linear.Y);
if (angle <= 45.0 || angle >= 315.0)
{
angle = 0.0;
}
else if (angle >= 135.0 && angle <= 225.0)
{
angle = 180.0;
}
this.ReleaseMouseCaptureAtGestureOrigin();
}
return new GestureEnd(angle, isInertial, cumulative.Translation, position);
}
