protected void PropogateToRoot(Nullable <bool> isChecked)
{
// If isChecked is not null (some checked), find out what it's value should be
if (isChecked != null)
{
bool hasChecked = false;
bool hasUnchecked = false;
foreach (object item in Items)
{
FolderTreeViewItem tvm = item as FolderTreeViewItem;
if (tvm != null)
{
if (tvm.IsChecked == null)
{
hasChecked = true;
hasUnchecked = true;
break;
}
else if (tvm.IsChecked == true)
{
hasChecked = true;
if (hasUnchecked)
{
break;
}
}
else
{
hasUnchecked = true;
if (hasChecked)
{
break;
}
}
}
}
if (hasChecked && hasUnchecked)
{
isChecked = null;
}
else if (hasChecked)
{
isChecked = true;
}
else
{
isChecked = false;
}
}
// If isChecked is different from current value, update it and propogate
if (fCheckBox.IsChecked != isChecked)
{
fPropogating = true;
fCheckBox.IsChecked = isChecked;
FolderTreeViewItem tvm = Parent as FolderTreeViewItem;
if (tvm != null)
{
tvm.PropogateToRoot(isChecked);
}
fPropogating = false;
}
}
