private void HandleItemSelection(ItemClickEventArgs args)
{
if (SelectionMode != ListViewSelectionMode.None)
{
var newSelection = BindableAdapter.GetRawItem(args.Position);
switch (SelectionMode)
{
case ListViewSelectionMode.Single:
var selectedItem = BindableAdapter.SelectedItems.FirstOrDefault();
// Unselect the current item only if a new selection is made or
// the option to unselect the current item is activated.
if (selectedItem != null && (selectedItem != newSelection || UnselectOnClick))
{
BindableAdapter.SetItemSelection(selectedItem, null, false);
}
if (selectedItem != newSelection)
{
BindableAdapter.SetItemSelection(
newSelection,
(args.View as ItemContainerHolder)?.Child as SelectorItem,
true
);
}
SelectedItem = newSelection;
break;
case ListViewSelectionMode.Multiple:
BindableAdapter.SetItemSelection(
BindableAdapter.GetRawItem(args.Position),
args.View as SelectorItem,
!BindableAdapter.SelectedItems.Contains(newSelection)
);
break;
}
SelectedItems = BindableAdapter.SelectedItems.ToArray();
}
}
private void UpdateSelection(IList <object> newSelection)
{
if (BindableAdapter != null)
{
if (!BindableAdapter.SelectedItems.SequenceEqual(newSelection))
{
var removed = BindableAdapter
.SelectedItems
.Except(newSelection)
.ToArray();
var added = newSelection
.Except(BindableAdapter.SelectedItems)
.ToArray();
removed.ForEach((object i) => BindableAdapter.SetItemSelection(i, null, false));
added.ForEach((object i) => BindableAdapter.SetItemSelection(i, null, true));
}
}
}
private void UpdateSelection(object[] oldSelection, object[] newSelection)
{
if (BindableAdapter != null)
{
if (!BindableAdapter.SelectedItems.SequenceEqual(newSelection))
{
var removed = BindableAdapter
.SelectedItems
.Except(newSelection)
.ToArray();
var added = newSelection
.Except(BindableAdapter.SelectedItems)
.ToArray();
removed.ForEach((object i) => BindableAdapter.SetItemSelection(i, null, false));
added.ForEach((object i) => BindableAdapter.SetItemSelection(i, null, true));
}
}
SelectionChanged?.Invoke(this, new SelectionChangedEventArgs(oldSelection, newSelection));
}