/// <summary>
/// Create a picker with the optional title and selectedIndexChange event method.
/// </summary>
/// <param name="titleLabel">Title on top of the list items.</param>
/// <param name="selectedIndexChangeDelegate">Method to call when the event SelectedItemChanged is triggered on the picker control.</param>
/// <param name="itemsSource">Items to show in the picker.</param>
/// <param name="startIndex">Index of the initially selected item.</param>
/// <returns>A new instance of PickerEx control.</returns>
public static PickerEx CreatePicker(string titleLabel, SelectItemAction selectedIndexChangeDelegate, IEnumerable itemsSource, int startIndex)
{
string title = titleLabel == null ? null : titleLabel;
PickerEx picker = new PickerEx();
if (!String.IsNullOrEmpty(title))
{
picker.Title = title;
}
picker.ItemsSource = itemsSource;
// Set the initial index before adding a handler.
picker.SelectedIndex = startIndex;
if (selectedIndexChangeDelegate != null)
{
int previousIndex = picker.SelectedIndex;
picker.SelectedIndexChanged += async(sender, args) =>
{
if (picker.SelectedIndex > -1 && picker.SelectedIndex != previousIndex)
{
string key = picker.Items[picker.SelectedIndex];
if (await selectedIndexChangeDelegate(key, picker.SelectedIndex))
{
previousIndex = picker.SelectedIndex;
}
else
{
// Set back to previous index
picker.SelectedIndex = previousIndex;
}
}
};
}
return(picker);
}
private void SelectItem(SelectItemAction pSelectItemAction)
{
ArgumentsValidation.NotNull(pSelectItemAction, "pSelectItemAction");
var item = pSelectItemAction.SelectedItem as ChapterInformation;
if (item == null)
{
throw new InvalidOperationException("Cannot selected an item that is not a chapter");
}
if (!_chapters.Contains(item))
{
throw new InvalidOperationException("Cannot select an item that is not in list");
}
SelectChapter(item);
}
/// <summary>
/// Create a picker with the optional title and selectedIndexChange event method.
/// </summary>
/// <param name="titleLabel">Title on top of the list items.</param>
/// <param name="selectedIndexChangeDelegate">Method to call when the event SelectedItemChanged is triggered on the picker control.</param>
/// <returns>A new instance of PickerEx control.</returns>
public static PickerEx CreatePicker(string titleLabel = null, SelectItemAction selectedIndexChangeDelegate = null)
{
return(ControlFactory.CreatePicker(titleLabel, selectedIndexChangeDelegate, null, 0));
}
