private static void SetChildCheckedState(TreeViewItemViewModel itemsControl, bool checkedstate)
{
itemsControl.IsChecked = checkedstate;
for (int i = 0; i < itemsControl.Children.Count; i++)
{
TreeViewItemViewModel tvi = itemsControl.Children[i];
if (tvi != null)
{
tvi.IsChecked = checkedstate;
SetChildCheckedState(tvi, checkedstate);
}
}
}
//private static T FindVisualChild<T>(Visual visual) where T : Visual
//{
// for (int i = 0; i < VisualTreeHelper.GetChildrenCount(visual); i++)
// {
// Visual child = (Visual)VisualTreeHelper.GetChild(visual, i);
// if (child != null)
// {
// T correctlyTyped = child as T;
// if (correctlyTyped != null)
// {
// return correctlyTyped;
// }
// T descendent = FindVisualChild<T>(child);
// if (descendent != null)
// {
// return descendent;
// }
// }
// }
// return null;
//}
//--------------------------------------------------------------------------
private static void SetParentCheckedState(TreeViewItemViewModel tvitem)
{
if (tvitem != null)
{
TreeViewItemViewModel parent = tvitem.Parent;
if (!(parent is null) && parent.CheckBoxVisibility == Visibility.Visible)
{
Collection <TreeViewItemViewModel> items = parent.Children;
int cntindeterminate = 0;
int cntunchecked = 0;
int cntchecked = 0;
foreach (var i in items)
{
if (i.IsChecked == true)
{
cntchecked++;
}
else
if (i.IsChecked == false)
{
cntunchecked++;
}
else
if (i.IsChecked == null)
{
cntindeterminate++;
}
}
if (cntindeterminate > 0 || (cntunchecked > 0 && cntunchecked < items.Count))
{
parent.IsChecked = null;
}
else
if (cntchecked == items.Count)
{
parent.IsChecked = true;
}
else
if (cntunchecked == items.Count)
{
parent.IsChecked = false;
}
}
}
}
protected TreeViewItemViewModel(TreeViewItemViewModel parent, bool lazyLoadChildren)
{
_parent = parent;
_children = new ObservableCollection <TreeViewItemViewModel>();
}