protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
{
base.OnCollectionChanged(e);
// todo temp
HandleCollectionReset();
return;
if (e.Action == NotifyCollectionChangedAction.Reset)
{
HandleCollectionReset();
}
else if (e.Action == NotifyCollectionChangedAction.Add)
{
if (e.NewItems != null)
{
Range<int> addedRange = e.GetAddedRange();
if (indexRange.IntersectsWith(addedRange))
{
HandleCollectionAdd(e);
}
else if (indexRange.Max == addedRange.Min - 1) // item was added into the end of collection
{
Path lastPath = drawnPaths.Last();
int lastCount = LineChartBase.GetPointsCount(lastPath);
Range<int> requestRange = new Range<int>(addedRange.Min - 1, addedRange.Max);
// have path with non-filled geometry
if (lastCount + addedRange.GetLength() <= pathLength)
{
canvas.Children.Remove(lastPath);
drawnPaths.Remove(lastPath);
pathsPool.Put(lastPath);
Range<int> lastPathRange = PointChartBase.GetIndexRange(lastPath);
int min = requestRange.Min;
if (min % pathLength == 0)
min -= 1;
requestRange = new Range<int>(min, addedRange.Max);
}
var points = DataSource.GetPointData(requestRange);
var indexedPoints = IndexWrapper.Generate(points, requestRange.Min);
// do nothing if there is nothing to draw
if (!points.Any())
return;
int minIndex;
int maxIndex;
CreateAndAddPath(indexedPoints, out minIndex, out maxIndex, transformWhileCreateUI);
this.indexRange = new Range<int>(indexRange.Min, maxIndex);
}
else
{
// todo
// do nothing?
}
}
else
{
HandleCollectionReset();
}
}
}
private void HandleCollectionAdd(NotifyCollectionChangedEventArgs e)
{
Range<int> addedRange = e.GetAddedRange();
var paths = (from path in drawnPaths
let pathRange = PointChartBase.GetIndexRange(path)
where pathRange.IntersectsWith(addedRange)
let bounds = PointChartBase.GetContentBounds(path)
select new { path, bounds }).ToList();
DataRect unitedContentBounds = paths.Aggregate(
DataRect.Empty, (rect, other) => DataRect.Union(rect, other.bounds));
var added = e.NewItems;
// todo finish
}