public override bool applyContentDimensions(float minScrollExtent, float maxScrollExtent)
{
if (!PhysicsUtils.nearEqual(this._minScrollExtent, minScrollExtent, Tolerance.defaultTolerance.distance) ||
!PhysicsUtils.nearEqual(this._maxScrollExtent, maxScrollExtent, Tolerance.defaultTolerance.distance) ||
this._didChangeViewportDimensionOrReceiveCorrection)
{
this._minScrollExtent = minScrollExtent;
this._maxScrollExtent = maxScrollExtent;
this._haveDimensions = true;
this.applyNewDimensions();
this._didChangeViewportDimensionOrReceiveCorrection = false;
}
return(true);
}
void _tickDisplacement(TimeSpan elapsed)
{
if (_displacementTickerLastElapsed != null)
{
float?t = elapsed.Milliseconds - _displacementTickerLastElapsed?.Milliseconds;
_displacement = _displacementTarget - (_displacementTarget - _displacement) *
Mathf.Pow(2.0f, (-t ?? 0.0f) / _crossAxisHalfTime.Milliseconds);
notifyListeners();
}
if (PhysicsUtils.nearEqual(_displacementTarget, _displacement,
Tolerance.defaultTolerance.distance))
{
_displacementTicker.stop();
_displacementTickerLastElapsed = null;
}
else
{
_displacementTickerLastElapsed = elapsed;
}
}
public override IPromise animateTo(float to,
TimeSpan duration,
Curve curve
)
{
if (PhysicsUtils.nearEqual(to, this.pixels, this.physics.tolerance.distance))
{
this.jumpTo(to);
return(Promise.Resolved());
}
DrivenScrollActivity activity = new DrivenScrollActivity(
this,
from: this.pixels,
to: to,
duration: duration,
curve: curve,
vsync: this.context.vsync
);
this.beginActivity(activity);
return(activity.done);
}
public override Future animateTo(
float to,
TimeSpan duration,
Curve curve
)
{
if (PhysicsUtils.nearEqual(to, pixels, physics.tolerance.distance))
{
jumpTo(to);
return(Future.value());
}
DrivenScrollActivity activity = new DrivenScrollActivity(
this,
from: pixels,
to: to,
duration: duration,
curve: curve,
vsync: context.vsync
);
beginActivity(activity);
return(activity.done);
}