private int GetItemLevel(TreeViewItem item)
{
var parent = GetParentItem(item);
if (parent != null)
{
return(TreeViewService.GetItemLevel(parent) + 1);
}
return(0);
}
/// <summary>
/// Converts a <see cref="TreeViewItem"/> to its level in the hierarchy
/// of its <see cref="TreeView"/>. Also sets the
/// <see cref="TreeViewService.ItemLevelProperty"/> on each converted
/// <see cref="TreeViewItem"/>.
/// </summary>
/// <param name="value">The value produced by the binding source.</param>
/// <param name="targetType">
/// The type of the binding target property.
/// </param>
/// <param name="parameter">
/// An optional <see cref="int"/> or <see cref="double"/> factor.
/// </param>
/// <param name="culture">
/// The culture to use in the converter. <b>Not used.</b>
/// </param>
/// <returns>
/// The level of the <see cref="TreeViewItem"/>, multiplied by the
/// factor specified by <paramref name="parameter"/> if provided. The
/// level of root items is 0.
/// </returns>
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (!(value is TreeViewItem item))
{
return(DependencyProperty.UnsetValue);
}
int level = GetItemLevel(item);
TreeViewService.SetItemLevel(item, level);
if (parameter is int i)
{
return(level * i);
}
if (parameter is double d)
{
return(level * d);
}
return(level);
}
