/// <summary>
/// Removes data point's legend item when the data point is removed.
/// </summary>
/// <param name="dataPoint">The data point to remove.</param>
protected override void RemoveDataPoint(DataPoint dataPoint)
{
base.RemoveDataPoint(dataPoint);
if (dataPoint != null)
{
LegendItem legendItem = _dataPointLegendItems[dataPoint];
_dataPointLegendItems.Remove(dataPoint);
LegendItems.Remove(legendItem);
UpdateLegendItemIndexes();
}
}
/// <summary>
/// Manage dynamic legend updates.
/// </summary>
/// <param name="sender">Component sending update.</param>
/// <param name="ldea">Current state of legend.</param>
private void Ipld_LegendChanged(ChartComponent sender, LegendDynamicEventArgs ldea)
{
foreach (var prev in ldea.PreviousItems)
{
if (!ldea.CurrentItems.Contains(prev))
{
LegendItems.Remove(prev);
}
}
foreach (var curr in ldea.CurrentItems)
{
if (!LegendItems.Contains(curr))
{
LegendItems.Add(curr);
}
}
}
/// <summary>
/// Common logic for leaving the chart.
/// SHOULD be strict dual of ComponentEnter sequence.
/// </summary>
/// <param name="icelc">The context.</param>
/// <param name="cc">The component leaving chart.</param>
protected void ComponentLeave(IChartEnterLeaveContext icelc, ChartComponent cc)
{
foreach (var px in AllPhases)
{
px.Leave(cc);
}
if (cc is IProvideDataSourceRenderer ipdsr)
{
Unregister(ipdsr.Renderer);
}
else if (cc is IDataSourceRenderer idsr)
{
Unregister(idsr);
}
if (cc is IChartAxis ica)
{
Axes.Remove(ica);
}
if (cc is IProvideLegendDynamic ipld)
{
// detach the event
ipld.LegendChanged -= Ipld_LegendChanged;
}
if (cc is IProvideLegend ipl)
{
foreach (var li in ipl.LegendItems)
{
LegendItems.Remove(li);
}
}
if (cc is IRequireEnterLeave irel)
{
irel.Leave(icelc);
}
if (cc is IRequireChartTheme irct)
{
irct.Theme = null;
}
}