/// <summary>
/// Raises event before list item is removed and provides oppertunity to cancel.
/// </summary>
/// <param name="args">Event arguments.</param>
protected virtual void OnItemRemoving(ItemRemovingEventArgs args)
{
if (ItemRemoving != null)
ItemRemoving(this, args);
}
/// <summary>
/// Remove specified item.
/// </summary>
/// <remarks>
/// <para>The event <see cref="ItemRemoving"/> is raised prior to removing item
/// and allows removal to be cancelled.</para>
/// </remarks>
/// <param name="adaptor">Reorderable list adaptor.</param>
/// <param name="itemIndex">Zero-based index of item.</param>
/// <returns>
/// Returns a value of <c>false</c> if operation was cancelled.
/// </returns>
protected bool RemoveItem(IReorderableListAdaptor adaptor, int itemIndex)
{
var args = new ItemRemovingEventArgs(adaptor, itemIndex);
OnItemRemoving(args);
if (args.Cancel)
return false;
adaptor.Remove(itemIndex);
GUI.changed = true;
ReorderableListGUI.indexOfChangedItem = -1;
return true;
}
/// <summary>
/// Remove all items from list.
/// </summary>
/// <remarks>
/// <para>The event <see cref="ItemRemoving"/> is raised for each item prior to
/// clearing array and allows entire operation to be cancelled.</para>
/// </remarks>
/// <param name="adaptor">Reorderable list adaptor.</param>
/// <returns>
/// Returns a value of <c>false</c> if operation was cancelled.
/// </returns>
protected bool ClearAll(IReorderableListAdaptor adaptor)
{
if (adaptor.Count == 0)
return true;
var args = new ItemRemovingEventArgs(adaptor, 0);
int count = adaptor.Count;
for (int i = 0; i < count; ++i) {
args.itemIndex = i;
OnItemRemoving(args);
if (args.Cancel)
return false;
}
adaptor.Clear();
GUI.changed = true;
ReorderableListGUI.indexOfChangedItem = -1;
return true;
}