/// <summary>Given a pre-existing tree grid collection, show/hide items based on if obscure features should be hidden </summary>
public static TreeGridItemCollection FilterByObscurity(TreeGridItemCollection selectableData,
bool hideObscureFeatures, TreeGridItemCollection currentSelectableData = null)
{
// Need to clone the items and make a new list to preserve the original Collection as unfiltered
var newSelectableData = new TreeGridItemCollection();
for (var i = 0; i < selectableData.Count; i++)
{
// Try to preserve open/close and selected/unselected state during filtering
var previousItem = selectableData[i] as OSMTreeGridItem;
if (currentSelectableData != null)
{
var currentItem = currentSelectableData.Where(t => t.ToString() == previousItem.ToString()).First();
if (currentItem != null)
{
previousItem = currentItem as OSMTreeGridItem;
}
}
var currentTagExpanded = previousItem.Expanded;
var currentTagSelected = previousItem.IsSelected();
var originalTag = selectableData[i] as OSMTreeGridItem;
if (originalTag.IsObscure && hideObscureFeatures)
{
continue;
}
var newTag = new OSMTreeGridItem(originalTag.OSMData, originalTag.OSMData.NodeCount,
originalTag.OSMData.WayCount, originalTag.IsParsed, currentTagSelected, currentTagExpanded);
foreach (OSMTreeGridItem originalChild in originalTag.Children)
{
if (!originalChild.IsObscure || !hideObscureFeatures)
{
newTag.Children.Add(originalChild);
}
}
newSelectableData.Add(newTag);
}
return(newSelectableData);
}