private static TreeViewDataItem GoToTreeViewDataItem(this TreeView tv, Func <TreeViewDataItem, bool> whereClausule, bool forceSearchFromBeginning, bool searchReverse)
{
TreeViewDataItem startItem = null;
if (forceSearchFromBeginning || tv.SelectedItem == null)
{
var firstItem = tv.Items.Cast <TreeViewDataItem>().FirstOrDefault();
if (firstItem != null)
{
startItem = (TreeViewDataItem)firstItem.Parent;
}
}
else
{
startItem = (TreeViewDataItem)tv.SelectedItem;
}
var res = startItem != null?startItem.FindItem(whereClausule, searchReverse : searchReverse) : null;
if (res != null)
{
((TreeViewDataItem)res.Parent).Expand();
res.IsSelected = true;
}
else
{
System.Media.SystemSounds.Beep.Play();
}
return(res);
}
/// <summary>
/// Iterates through items in the hierarchy to return the first one
/// matching the given predicate, or null if none found.
/// </summary>
/// <param name="condition">
/// The condition to be met for the item to be returned.
/// </param>
public static TreeViewDataItem Find(
this TreeViewDataItem item,
Func <TreeViewDataItem, bool> condition)
{
//Tests the current item if it matches.
if (condition(item))
{
return(item);
}
//Iterates through each database, collection, grouping, and entry
//to find the desired item.
for (int col = 0; col < item.Items.Count; col++)
{
var colItem = (TreeViewDataItem)item.Items[col];
if (colItem == null)
{
continue;
}
else if (condition(colItem))
{
return(colItem);
}
for (int grp = 0; grp < colItem.Items.Count; grp++)
{
var grpItem = (TreeViewDataItem)colItem.Items[grp];
if (grpItem == null)
{
continue;
}
else if (condition(grpItem))
{
return(grpItem);
}
for (int ent = 0; ent < grpItem.Items.Count; ent++)
{
var entItem = (TreeViewDataItem)grpItem.Items[ent];
if (entItem == null)
{
continue;
}
else if (condition(entItem))
{
return(entItem);
}
}
}
}
return(null);
}
