/// <summary>
/// Caled when the <see cref="Items"/> property changes.
/// </summary>
/// <param name="e">The event args.</param>
protected virtual void ItemsChanged(PerspexPropertyChangedEventArgs e)
{
var incc = e.OldValue as INotifyCollectionChanged;
if (incc != null)
{
incc.CollectionChanged += ItemsCollectionChanged;
}
var newValue = e.NewValue as IEnumerable;
if (newValue == null || newValue.Count() == 0)
{
Classes.Add(":empty");
}
else
{
Classes.Remove(":empty");
}
incc = newValue as INotifyCollectionChanged;
if (incc != null)
{
incc.CollectionChanged += ItemsCollectionChanged;
}
}
/// <summary>
/// Called when the <see cref="INotifyCollectionChanged.CollectionChanged"/> event is
/// raised on <see cref="Items"/>.
/// </summary>
/// <param name="sender">The event sender.</param>
/// <param name="e">The event args.</param>
protected virtual void ItemsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
var collection = sender as ICollection;
if (collection.Count == 0)
{
Classes.Add(":empty");
}
else
{
Classes.Remove(":empty");
}
}
/// <inheritdoc/>
protected override void OnPointerReleased(PointerEventArgs e)
{
base.OnPointerReleased(e);
e.Device.Capture(null);
Classes.Remove(":pressed");
e.Handled = true;
if (ClickMode == ClickMode.Release && Classes.Contains(":pointerover"))
{
RaiseClickEvent();
}
}
/// <summary>
/// Subscribes to an <see cref="Items"/> collection.
/// </summary>
/// <param name="items"></param>
private void SubscribeToItems(IEnumerable items)
{
if (items == null || items.Count() == 0)
{
Classes.Add(":empty");
}
else
{
Classes.Remove(":empty");
}
var incc = items as INotifyCollectionChanged;
if (incc != null)
{
incc.CollectionChanged += ItemsCollectionChanged;
}
}