public void OnItemTapped(MultiLevelItemBase item)
{
// Check if item is on expand state
if (item.IsExpand)
{
// Set collapse
item.Collapse();
var allChildren = item.Children.Concat(item.Children.SelectMany(p => p.Children));
// Remove children
foreach (var child in allChildren)
{
ItemsSource.Remove(child);
}
}
else
{
// get item index
var i = ItemsSource.IndexOf(item) + 1;
// insert item under the parent
foreach (var child in item.Children)
{
ItemsSource.Insert(i++, child);
}
item.Expand();
}
}
private void InitAsync()
{
_listView = new MultiLevelListView();
_source = new ObservableCollection<MultiLevelItemBase>();
_listView.ItemTemplate = new DataTemplate(typeof(MrGestureTestCell));
_listView.ItemTemplate.SetBinding(MrGestureTestCell.ItemProperty, "Item");
// The root page of your application
Content = new ContentView()
{
Content = _listView
};
for (int i = 0; i < 3; i++)
{
var root = new MultiLevelItemBase() { Name = "Root " + i };
_source.Add(root);
for (int j = 0; j < 3; j++)
{
var child1 = new MultiLevelItemBase() { Name = $"\tChild {i}-{j}" };
root.Children.Add(child1);
for (int k = 0; k < 3; k++)
{
var child2 = new MultiLevelItemBase() { Name = $"\t\tChild {i}-{j}-{k}" };
child1.Children.Add(child2);
}
}
}
_listView.ItemsSource = _source;
}