public ScrollDragController(
ScrollActivityDelegate del = null,
DragStartDetails details = null,
VoidCallback onDragCanceled = null,
double?carriedVelocity = null,
double?motionStartDistanceThreshold = null
)
{
D.assert(del != null);
D.assert(details != null);
D.assert(
motionStartDistanceThreshold == null || motionStartDistanceThreshold > 0.0,
"motionStartDistanceThreshold must be a positive number or null"
);
this._del = del;
this._lastDetails = details;
this._retainMomentum = carriedVelocity != null && carriedVelocity != 0.0;
this._lastNonStationaryTimestamp = details.sourceTimeStamp;
this._offsetSinceLastStop = motionStartDistanceThreshold == null ? (double?)null : 0.0;
this.onDragCanceled = onDragCanceled;
this.carriedVelocity = carriedVelocity;
this.motionStartDistanceThreshold = motionStartDistanceThreshold;
}
public DragScrollActivity(
ScrollActivityDelegate del,
ScrollDragController controller
) : base(del)
{
this._controller = controller;
}
public HoldScrollActivity(
ScrollActivityDelegate del = null,
VoidCallback onHoldCanceled = null
) : base(del)
{
this.onHoldCanceled = onHoldCanceled;
}
public BallisticScrollActivity(
ScrollActivityDelegate del,
Simulation simulation,
TickerProvider vsync
) : base(del)
{
this._controller = AnimationController.unbounded(
debugLabel: this.GetType().ToString(),
vsync: vsync
);
this._controller.addListener(this._tick);
this._controller.animateWith(simulation).Then(() => this._end());
}
public DrivenScrollActivity(
ScrollActivityDelegate del,
double from,
double to,
TimeSpan duration,
Curve curve,
TickerProvider vsync
) : base(del)
{
D.assert(duration > TimeSpan.Zero);
D.assert(curve != null);
this._completer = new Promise();
this._controller = AnimationController.unbounded(
value: from,
debugLabel: this.GetType().ToString(),
vsync: vsync
);
this._controller.addListener(this._tick);
this._controller.animateTo(to, duration: duration, curve: curve)
.Then(() => this._end());
}
public DrivenScrollActivity(
ScrollActivityDelegate del,
float from,
float to,
TimeSpan duration,
Curve curve,
TickerProvider vsync
) : base(del)
{
D.assert(duration > TimeSpan.Zero);
D.assert(curve != null);
_completer = Completer.create();
_controller = AnimationController.unbounded(
value: from,
debugLabel: GetType().ToString(),
vsync: vsync
);
_controller.addListener(_tick);
_controller.animateTo(to, duration: duration, curve: curve)
.then(o => _end());
}
public virtual void dispose()
{
this._del = null;
}
public void updateDelegate(ScrollActivityDelegate value)
{
D.assert(this._del != value);
this._del = value;
}
public ScrollActivity(ScrollActivityDelegate del)
{
this._del = del;
}
public IdleScrollActivity(ScrollActivityDelegate del) : base(del)
{
}
public virtual void dispose()
{
_del = null;
}
