void IRequireDataSourceUpdates.Add(IChartRenderContext icrc, int startAt, IList items)
{
// mimic the DSRP sequence
var widx = LabelStyle?.Find(FrameworkElement.WidthProperty);
var bl = new BindingEvaluator(LabelPath);
// keep a separate list; easier at the end
var reproc = new List <ItemState>();
for (int ix = 0; ix < items.Count; ix++)
{
// add requested item
var label = bl.For(items[ix]);
var istate = makeit(startAt + ix, label, widx == null);
AxisLabels.Insert(startAt + ix, istate);
reproc.Add(istate);
}
// re-sequence remaining items
for (int ix = startAt + reproc.Count; ix < AxisLabels.Count; ix++)
{
AxisLabels[ix].index = ix;
AxisLabels[ix].value = ix;
}
// render new items
// run the element pipeline on the added items
var recycler = new Recycler <FrameworkElement, ItemState>(CreateElement);
var labels = new List <ICategoryLabelState>(AxisLabels);
var sc = new SelectorContext(this, icrc.SeriesArea, labels);
foreach (var istate in reproc)
{
ElementPipeline(sc, istate, recycler);
}
// configure axis limits; just based on count-of-elements
UpdateLimits(0);
UpdateLimits(AxisLabels.Count);
// finish up
Layer.Add(recycler.Created);
RebuildAxisGeometry();
Dirty = false;
}
object IDataSourceRenderer.Preamble(IChartRenderContext icrc)
{
if (Theme?.TextBlockTemplate == null)
{
// already reported an error so this should be no surprise
return(null);
}
if (String.IsNullOrEmpty(LabelPath))
{
return(null);
}
var bl = new BindingEvaluator(LabelPath);
if (bl == null)
{
return(null);
}
var recycler = new Recycler <FrameworkElement, ItemState>(AxisLabels.Where(tl => tl.element != null).Select(tl => tl.element), CreateElement);
ResetLimits();
var widx = LabelStyle?.Find(FrameworkElement.WidthProperty);
return(new State(new List <ItemState>(), recycler, icrc, widx == null, bl));
}