// Handle the dismiss event on the dialog to raise a custom event that passes the updated order fields back
public override void OnDismiss(IDialogInterface dialog)
{
base.OnDismiss(dialog);
// Verify the event has listeners
if (OrderFieldDialogClosed != null)
{
// Get an array of checked list item positions (indices)
SparseBooleanArray checkedItemsArray = _orderFieldsListView.CheckedItemPositions;
// Loop through all the available order fields
for (int i = 0; i < _potentialOrderByFields.Count; i++)
{
// Initially set each order option to false
OrderFieldOption orderOption = _potentialOrderByFields[i];
orderOption.OrderWith = false;
// If the item was checked in the list view, set the order option to true
if (checkedItemsArray.KeyAt(i) == i && checkedItemsArray.ValueAt(i))
{
orderOption.OrderWith = true;
}
}
// Raise the event and pass back the updated list of order field options
OrderFieldDialogClosed(this, _potentialOrderByFields);
}
}
private void ShowGroupFields(object sender, EventArgs e)
{
// Create a dialog for choosing fields to group results with
GroupFieldsDialog groupFieldsDialog = new GroupFieldsDialog(_groupByFields);
// Handle the dialog closing event to read the selected fields
groupFieldsDialog.GroupFieldDialogClosed += (s, args) =>
{
// Update the dictionary of group fields from the dialog
_groupByFields = args;
// Get the current list of group fields and create/update the sort field choices
// (only fields selected for grouping can be used to order results)
List <KeyValuePair <string, bool> > currentGroupFields = _groupByFields.Where(field => field.Value == true).ToList();
// Loop through the group fields
foreach (KeyValuePair <string, bool> groupField in currentGroupFields)
{
// Check if this field is missing from the current sort field options
OrderFieldOption existingOption = _orderByFields.Find((opt) => opt.OrderInfo.FieldName == groupField.Key);
if (existingOption == null)
{
// If the field is missing, create a new OrderFieldOption and add it to the list
existingOption = new OrderFieldOption(false, new OrderBy(groupField.Key, SortOrder.Ascending));
_orderByFields.Add(existingOption);
}
}
// Also make sure to remove any 'order by' fields that were removed from the 'group by' list
for (int i = _orderByFields.Count - 1; i >= 0; i--)
{
// If the order by field is not also one of the group fields, remove it from the list
OrderFieldOption opt = _orderByFields.ElementAt(i);
KeyValuePair <string, bool> existingGroupField = currentGroupFields.FirstOrDefault(field => field.Key == opt.OrderInfo.FieldName);
if (existingGroupField.Key == null)
{
_orderByFields.RemoveAt(i);
}
}
};
// Begin a transaction to show a UI fragment (group fields dialog)
FragmentTransaction trans = FragmentManager.BeginTransaction();
groupFieldsDialog.Show(trans, "group_flds");
}
