public Driver(FastVerticallyScrollingItemViewer parent, IComparer <T> comparer)
{
this._parent = parent;
this._layoutTree = new PersistentAggregatingRedBlackTree <Unique <T>, ControlData, double>(
(a1, k, v, a2) => a1 + v.Value.Type.Height + a2,
Unique <T> .MakeComparerUnique(comparer));
parent.scrollView.ViewChanged += (sender, arg) => UpdateShown();
parent.scrollView.SizeChanged += (sender, arg) => {
parent.layoutArea.Width = arg.NewSize.Width; // Warning: removing this may result in search results that drift right/left as they are manipulated by touch
UpdateShown();
};
}
public Unique <T> Add(T key, IVirtualControlValue value)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
var uniqueKey = new Unique <T>(key);
_layoutTree = _layoutTree.With(uniqueKey, new ControlData {
Value = value, Key = key
}, overwrite: false);
ScheduleUpdateShown();
return(uniqueKey);
}
public void Clear()
{
_layoutTree = _layoutTree.WithEmpty();
ScheduleUpdateShown();
}
public void Remove(Unique <T> key)
{
_layoutTree = _layoutTree.WithoutKey(key);
ScheduleUpdateShown();
}
