/// <summary>
/// Updates the selected items list by adding or removing the <see cref="SelectableItem{T}"/>.
/// </summary>
/// <param name="item">A <see cref="SelectableItem{T}"/> that will be added or removed from the selected
/// items list.</param>
private void UpdateSelectedItemsList(SelectableItem <T> item)
{
var idx = this.IndexOf(item);
if (!item.IsSelected)
{
if (this.MaintainsSelectedItemsOrder)
{
_selectedItemsIndexes.Remove(idx);
}
_selectedItems.Remove(item.Item);
}
else
{
if (this.MaintainsSelectedItemsOrder)
{
if (_selectedItemsIndexes.Count == 0 || _selectedItemsIndexes[_selectedItemsIndexes.Count - 1] < idx)
{
_selectedItemsIndexes.Add(idx);
_selectedItems.Add(item.Item);
}
else if (_selectedItemsIndexes[0] > idx)
{
_selectedItemsIndexes.Insert(0, idx);
_selectedItems.Insert(0, item.Item);
}
else
{
int indexOfNextGreatest = _selectedItemsIndexes.IndexOf(_selectedItemsIndexes.Where(i => i > idx).First());
_selectedItemsIndexes.Insert(indexOfNextGreatest, idx);
_selectedItems.Insert(indexOfNextGreatest, item.Item);
}
}
else
{
_selectedItems.Add(item.Item);
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SelectableItemChangedEventArgs{T}" /> class.
/// </summary>
/// <param name="changedItem">The changed item.</param>
public SelectableItemChangedEventArgs(SelectableItem <T> changedItem)
{
this.ChangedItem = changedItem;
}
private void BindToSelectableItem(SelectableItem <T> item)
{
item.PropertyChanged += this.OnItemPropertyChanged;
this.UpdateSelectedItemsList(item);
}