private void SetStartPosition(List <GroupChartItem> groupCenters)
{
GroupChartItem item = null;
var entries = groupCenters.OrderByDescending(x => x.Position);
if (StartPositionEnd == false)
{
item = entries.LastOrDefault();
StartPositionEnd = null;
}
else if (StartPositionEnd == true)
{
item = entries.FirstOrDefault();
StartPositionEnd = null;
}
else if (!string.IsNullOrEmpty(SelectedTag) && entries.Any(x => x.Label == SelectedLabel))
{
item = entries.FirstOrDefault(x => x.Tag == SelectedTag);
}
if (item == null)
{
item = entries.ElementAtOrDefault(entries.Count() / 2);
}
var firstItemsPosition = entries.LastOrDefault().Position;
var position = item.Position - firstItemsPosition;
ShowSwipeNotifications(position);
SnapToClosestBar(position, item);
}
private void SnapToClosestBar(double position, GroupChartItem selectedItem)
{
var selectedValues = new SelectedChartValueItemArgs
{
ChartValueItems = new List <ChartValueItemParam>(),
TouchedPoint = TouchedPoint
};
foreach (var chartEntry in ChartEntries.Where(x => x.IsVisible))
{
var chartEntryItem = chartEntry.Items.FirstOrDefault(i => i.Tag.ToString() == selectedItem.Tag.ToString());
if (chartEntryItem == null)
{
continue;
}
selectedValues.ChartValueItems.Add(new ChartValueItemParam(chartEntryItem, null, chartEntry));
}
// Invoke command with selected items
SelectedValuesCommand?.Execute(selectedValues);
Device.BeginInvokeOnMainThread(async() =>
{
isSnapping = true;
ScrollComponent.Scrolled -= ScrollComponent_Scrolled;
SelectedLabel = selectedItem.Label;
lastScrollPosition = position;
await ScrollComponent.ScrollToAsync(lastScrollPosition, 0, false);
ShowSwipeNotifications(lastScrollPosition);
ScrollComponent.Scrolled += ScrollComponent_Scrolled;
isSnapping = false;
});
}
