private bool findItemAndRemoveRecursively(IList<TreeItem> items, TreeItem item) {
if (items.Contains(item)) {
items.Remove(item);
return true;
}
foreach (TreeItem treeItem in items) {
if (findItemAndRemoveRecursively(treeItem.Items, item)) return true;
}
return false;
}
private void expandCollapse( TreeItem item ) {
int index = treeItemsFlat.IndexOf(item);
if ( item.Expanded ) {
collapse(item);
item.expanded = false;
// Need to update item string (because Expanded status has been changed)
listBox.Items[index] = item.DisplayTitle;
} else {
expand(item);
item.expanded = true;
// Need to update item string (because Expanded status has been changed)
listBox.Items[index] = item.DisplayTitle;
}
}
private void collapse(TreeItem item) {
// Children are collapsed but with Expanded state saved
foreach (TreeItem child in item.Items.Where(child => child.Expanded)) {
collapse(child);
}
int index = treeItemsFlat.IndexOf(item);
foreach (TreeItem child in item.Items) {
treeItemsFlat.RemoveAt(index + 1);
if (child.Disabled) listBox.DisabledItemsIndexes.Remove(index + 1);
listBox.Items.RemoveAt(index + 1);
child.Position = -1;
}
for (int k = index + 1; k < treeItemsFlat.Count; k++) {
treeItemsFlat[k].Position -= item.Items.Count;
}
}
private void expand(TreeItem item) {
int index = treeItemsFlat.IndexOf(item);
for (int i = 0; i < item.Items.Count; i++) {
TreeItem child = item.Items[i];
treeItemsFlat.Insert(i + index + 1, child);
child.Position = i + index + 1;
child.Level = item.Level + 1;
// Учесть уровень вложенности в title
listBox.Items.Insert(i + index + 1, child.DisplayTitle);
if (child.Disabled) listBox.DisabledItemsIndexes.Add(i + index + 1);
}
for (int k = index + 1 + item.Items.Count; k < treeItemsFlat.Count; k++) {
treeItemsFlat[k].Position += item.Items.Count;
}
// Children are expanded too according to their Expanded stored state
foreach (TreeItem child in item.Items.Where(child => child.Expanded)) {
expand(child);
}
}
private void onItemRemoved(TreeItem treeItem) {
if (treeItem.Expanded) collapse(treeItem);
treeItemsFlat.RemoveAt(treeItem.Position);
listBox.Items.RemoveAt(treeItem.Position);
for (int j = treeItem.Position; j < treeItemsFlat.Count; j++)
treeItemsFlat[j].Position--;
// Cleanup event handler recursively
unsubscribeFromItem(treeItem, ItemsOnListChanged);
if (listBox.SelectedItemIndex >= treeItem.Position)
RaisePropertyChanged("SelectedItem");
}
private void unsubscribeFromItem(TreeItem item, ListChangedHandler handler) {
item.items.ListChanged -= handler;
item.PropertyChanged -= itemOnPropertyChanged;
foreach (TreeItem child in item.items) {
unsubscribeFromItem(child, handler);
}
}
private void subscribeToItem(TreeItem item, ListChangedHandler handler) {
item.items.ListChanged += handler;
item.PropertyChanged += itemOnPropertyChanged;
foreach (TreeItem child in item.items) {
subscribeToItem(child, handler);
}
}