public override void attach(ScrollPosition position)
{
base.attach(position);
D.assert(!this._positionToListener.ContainsKey(position));
this._positionToListener[position] = () => {
this._lastUpdated = position;
this._lastUpdatedOffset = position.pixels;
};
position.addListener(this._positionToListener[position]);
}
public virtual void attach(ScrollPosition position)
{
D.assert(!this._positions.Contains(position));
this._positions.Add(position);
position.addListener(this.notifyListeners);
}
