bool _reconfigure(int pointer)
{
this._initialFocalPoint = this._currentFocalPoint;
this._initialSpan = this._currentSpan;
this._initialLine = this._currentLine;
this._initialHorizontalSpan = this._currentHorizontalSpan;
this._initialVerticalSpan = this._currentVerticalSpan;
if (this._state == _ScaleState.started)
{
if (this.onEnd != null)
{
VelocityTracker tracker = this._velocityTrackers[pointer];
D.assert(tracker != null);
Velocity velocity = tracker.getVelocity();
if (_ScaleGestureUtils._isFlingGesture(velocity))
{
Offset pixelsPerSecond = velocity.pixelsPerSecond;
if (pixelsPerSecond.distanceSquared >
Constants.kMaxFlingVelocity * Constants.kMaxFlingVelocity)
{
velocity = new Velocity(
pixelsPerSecond: (pixelsPerSecond / pixelsPerSecond.distance) *
Constants.kMaxFlingVelocity);
}
this.invokeCallback <object>("onEnd", () => {
this.onEnd(new ScaleEndDetails(velocity: velocity));
return(null);
});
}
else
{
this.invokeCallback <object>("onEnd", () => {
this.onEnd(new ScaleEndDetails(velocity: Velocity.zero));
return(null);
});
}
}
this._state = _ScaleState.accepted;
return(false);
}
return(true);
}
protected override void handleEvent(PointerEvent evt)
{
D.assert(_state != _ScaleState.ready);
bool didChangeConfiguration = false;
bool shouldStartIfAccepted = false;
if (evt is PointerMoveEvent)
{
VelocityTracker tracker = _velocityTrackers[evt.pointer];
D.assert(tracker != null);
if (!evt.synthesized)
{
tracker.addPosition(evt.timeStamp, evt.position);
}
_pointerLocations[evt.pointer] = evt.position;
shouldStartIfAccepted = true;
_lastTransform = evt.transform;
}
else if (evt is PointerDownEvent)
{
_pointerLocations[evt.pointer] = evt.position;
_pointerQueue.Add(evt.pointer);
didChangeConfiguration = true;
shouldStartIfAccepted = true;
_lastTransform = evt.transform;
}
else if (evt is PointerUpEvent || evt is PointerCancelEvent)
{
_pointerLocations.Remove(evt.pointer);
_pointerQueue.Remove(evt.pointer);
didChangeConfiguration = true;
_lastTransform = evt.transform;
}
_updateLines();
_update();
if (!didChangeConfiguration || _reconfigure(evt.pointer))
{
_advanceStateMachine(shouldStartIfAccepted);
}
stopTrackingIfPointerNoLongerDown(evt);
}
