internal void UpdateVisibleInLegend(DataPointBinding visibleInLegendBinding)
{
var oldVisibleInLegend = this.visibleInLegend;
if (visibleInLegendBinding != null && this.point.dataItem != null)
{
this.visibleInLegend = (bool)visibleInLegendBinding.GetValue(this.point.dataItem);
}
if (oldVisibleInLegend != this.visibleInLegend && this.ParentSeries != null)
{
if (this.visibleInLegend)
{
// TODO: Consider better solution for the scenario with runtime rebind of the control (pie segment reuse could be incorrectly interpreted as property change here).
// i.e. the data point at index i in the original source did not display in the legend, but the data point at the same index in the new source should be --
// as both data points are associated with the same segment -- we will end up with duplicates in the LegendInfos collection unless we add this check condition.
if (!this.ParentSeries.LegendInfos.Contains(this.legendItem))
{
this.ParentSeries.LegendInfos.Add(this.legendItem);
}
}
else
{
this.ParentSeries.LegendInfos.Remove(this.legendItem);
}
}
}
internal void UpdateLegendTitle(DataPointBinding legendTitleBinding)
{
object data = null;
if (legendTitleBinding != null && this.point.dataItem != null)
{
data = legendTitleBinding.GetValue(this.point.dataItem);
}
if (data != null)
{
this.legendItem.Title = data.ToString();
}
if (this.legendItem.Title == null || data == null)
{
this.legendItem.Title = this.point.Label.ToString();
}
}
internal static double CalculateValue(DataPointBinding highBinding, DataPointBinding lowBinding, DataPointBinding closeBinding, object previousItem, object currentItem)
{
double previousClose, high, low, value;
high = (double)highBinding.GetValue(currentItem);
low = (double)lowBinding.GetValue(currentItem);
if (previousItem != null)
{
previousClose = (double)closeBinding.GetValue(previousItem);
}
else
{
previousClose = (double)closeBinding.GetValue(currentItem);
}
value = high - low;
if (previousItem != null)
{
value = CalculateValue(previousClose, low, high);
}
return(value);
}
/// <summary>
/// Called when <seealso cref="PolarSeries.ValueBinding"/> has changed.
/// </summary>
/// <param name="oldValue">The old value.</param>
/// <param name="newValue">The new value.</param>
protected virtual void OnValueBindingChanged(DataPointBinding oldValue, DataPointBinding newValue)
{
}
/// <summary>
/// Called when <seealso cref="PolarSeries.ValueBinding" /> has changed.
/// </summary>
/// <param name="oldValue">The old value.</param>
/// <param name="newValue">The new value.</param>
protected override void OnValueBindingChanged(DataPointBinding oldValue, DataPointBinding newValue)
{
(this.dataSource as CategoricalSeriesDataSource).ValueBinding = newValue;
}