/// <summary>
/// Called when a property changes that should invalidate the visual.
/// </summary>
/// <param name="e">The event args.</param>
private static void AffectsRenderInvalidate(AvaloniaPropertyChangedEventArgs e)
{
(e.Sender as Visual)?.InvalidateVisual();
}
/// <summary>
/// Called when a visual's <see cref="RenderTransform"/> changes.
/// </summary>
/// <param name="e">The event args.</param>
private static void RenderTransformChanged(AvaloniaPropertyChangedEventArgs e)
{
var sender = e.Sender as Visual;
if (sender?.VisualRoot != null)
{
var oldValue = e.OldValue as Transform;
var newValue = e.NewValue as Transform;
if (oldValue != null)
{
oldValue.Changed -= sender.RenderTransformChanged;
}
if (newValue != null)
{
newValue.Changed += sender.RenderTransformChanged;
}
sender.InvalidateVisual();
}
}
/// <summary>
/// Notifies the <see cref="Changed"/> observable.
/// </summary>
/// <param name="e">The observable arguments.</param>
internal void NotifyChanged(AvaloniaPropertyChangedEventArgs e)
{
_changed.OnNext(e);
}
/// <summary>
/// Notifies the <see cref="Initialized"/> observable.
/// </summary>
/// <param name="e">The observable arguments.</param>
internal void NotifyInitialized(AvaloniaPropertyChangedEventArgs e)
{
_initialized.OnNext(e);
}
/// <summary>
/// Called when a avalonia property changes on the object.
/// </summary>
/// <param name="e">The event arguments.</param>
protected virtual void OnPropertyChanged(AvaloniaPropertyChangedEventArgs e)
{
}
/// <summary>
/// Called when a property changes that should invalidate the visual.
/// </summary>
/// <param name="e">The event args.</param>
private static void AffectsRenderInvalidate(AvaloniaPropertyChangedEventArgs e)
{
(e.Sender as Visual)?.InvalidateVisual();
}
internal void NotifyInitialized(AvaloniaObject o)
{
Contract.Requires <ArgumentNullException>(o != null);
var type = o.GetType();
void Notify(AvaloniaProperty property, object value)
{
var e = new AvaloniaPropertyChangedEventArgs(
o,
property,
AvaloniaProperty.UnsetValue,
value,
BindingPriority.Unset);
property.NotifyInitialized(e);
}
if (!_initializedCache.TryGetValue(type, out var initializationData))
{
var visited = new HashSet <AvaloniaProperty>();
initializationData = new List <PropertyInitializationData>();
foreach (AvaloniaProperty property in GetRegistered(type))
{
if (property.IsDirect)
{
initializationData.Add(new PropertyInitializationData(property, (IDirectPropertyAccessor)property));
}
else
{
initializationData.Add(new PropertyInitializationData(property, (IStyledPropertyAccessor)property, type));
}
visited.Add(property);
}
foreach (AvaloniaProperty property in GetRegisteredAttached(type))
{
if (!visited.Contains(property))
{
initializationData.Add(new PropertyInitializationData(property, (IStyledPropertyAccessor)property, type));
visited.Add(property);
}
}
_initializedCache.Add(type, initializationData);
}
foreach (PropertyInitializationData data in initializationData)
{
if (!data.Property.HasNotifyInitializedObservers)
{
continue;
}
object value = data.IsDirect ? data.DirectAccessor.GetValue(o) : data.Value;
Notify(data.Property, value);
}
}
