private void OnChildClick(object sender, ExpandableListView.ChildClickEventArgs childClickEventArgs)
{
var listView = ListView;
if (listView == null)
{
return;
}
var newValue =
((MvxExpandableListAdapter)listView.ExpandableListAdapter).GetRawItem(
childClickEventArgs.GroupPosition, childClickEventArgs.ChildPosition);
if (!newValue.Equals(_currentValue))
{
var pos = listView.GetFlatListPosition(
ExpandableListView.GetPackedPositionForChild(
childClickEventArgs.GroupPosition,
childClickEventArgs.ChildPosition));
listView.SetItemChecked(pos, true);
_currentValue = newValue;
FireValueChanged(newValue);
}
}
/// <summary>
/// An intermediary that will extract a root view from the given positions
/// and then toggle the content of the view.
/// </summary>
/// <param name="groupPosition"></param>
/// <param name="childPosition"></param>
private void Toggle(int groupPosition, int childPosition)
{
if (!list.IsGroupExpanded(groupPosition))
{
return; // We can't toggle; there is nothing to toggle.
}
bool isExpanded = IsExpanded(groupPosition, childPosition);
int flatPosition = list.GetFlatListPosition(ExpandableListView.GetPackedPositionForChild(groupPosition, childPosition));
int first = list.FirstVisiblePosition;
RootView view = (RootView)list.GetChildAt(flatPosition - first);
if (view != null)
{
Toggle(view);
}
if (view == null && isExpanded)
{
__expandedChildren.Remove(this[groupPosition, childPosition]);
}
else
{
__expandedChildren.AddLast(this[groupPosition, childPosition]);
}
}
protected override void SetValueImpl(object target, object value)
{
var listView = (MvxExpandableListView)target;
if (value == null)
{
_currentValue = null;
listView.ClearChoices();
return;
}
var positions = ((MvxExpandableListAdapter)listView.ExpandableListAdapter).GetPositions(value);
if (positions == null)
{
MvxBindingTrace.Trace(MvxTraceLevel.Warning, "Value not found for spinner {0}", value.ToString());
return;
}
_currentValue = value;
listView.SetSelectedChild(positions.Item1, positions.Item2, true);
var pos =
listView.GetFlatListPosition(ExpandableListView.GetPackedPositionForChild(positions.Item1,
positions.Item2));
listView.SetItemChecked(pos, true);
}
/// <summary>
/// Updates the child row view.
/// </summary>
/// <param name="groupPosition"></param>
/// <param name="childPosition"></param>
private void UpdateChild(int groupPosition, int childPosition)
{
if ((groupPosition >= 0 && groupPosition < GroupCount) &&
(childPosition >= 0 && childPosition < GetChildrenCount(groupPosition)))
{
int flatPosition = list.GetFlatListPosition(ExpandableListView.GetPackedPositionForChild(groupPosition, childPosition));
int first = list.FirstVisiblePosition;
View convert = list.GetChildAt(flatPosition - first);
GetChildView(groupPosition, childPosition, list.IsGroupExpanded(childPosition), convert, list);
}
}
/// <summary>
/// Queries the flat position of the child at the given position.
/// </summary>
/// <param name="groupPosition"></param>
/// <param name="childPosition"></param>
/// <returns></returns>
public int GetFlatPositionFor(int groupPosition, int childPosition)
{
return(list.GetFlatListPosition(ExpandableListView.GetPackedPositionForChild(groupPosition, childPosition)));
}
/// <summary>
/// Queries the packed position of the given child.
/// </summary>
/// <param name="group"></param>
/// <param name="child"></param>
/// <returns></returns>
public long GetPackedPositionFor(Group group, Child child)
{
return(ExpandableListView.GetPackedPositionForChild(IndexOf(group), IndexOf(group, child)));
}
public override long GetGroupId(int groupPosition)
{
return(ExpandableListView.GetPackedPositionForChild(groupPosition, 0));
}
public override long GetChildId(int groupPosition, int childPosition)
{
return(ExpandableListView.GetPackedPositionForChild(groupPosition, childPosition + 1));
}
