/// <summary>
/// Calls the <see cref="OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs)"/> method
/// for this control and all of its visual descendants.
/// </summary>
/// <param name="e">The event args.</param>
protected virtual void OnDetachedFromVisualTreeCore(VisualTreeAttachmentEventArgs e)
{
Logger.TryGet(LogEventLevel.Verbose)?.Log(LogArea.Visual, this, "Detached from visual tree");
_visualRoot = null;
if (RenderTransform != null)
{
RenderTransform.Changed -= RenderTransformChanged;
}
OnDetachedFromVisualTree(e);
DetachedFromVisualTree?.Invoke(this, e);
e.Root?.Renderer?.AddDirty(this);
var visualChildren = VisualChildren;
if (visualChildren != null)
{
var visualChildrenCount = visualChildren.Count;
for (var i = 0; i < visualChildrenCount; i++)
{
if (visualChildren[i] is Visual child)
{
child.OnDetachedFromVisualTreeCore(e);
}
}
}
}
/// <summary>
/// Called when the control is removed from a visual tree.
/// </summary>
/// <param name="e">The event args.</param>
/// <remarks>
/// It is vital that if you override this method you call the base implementation;
/// failing to do so will cause numerous features to not work as expected.
/// </remarks>
protected virtual void OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs e)
{
if (RenderTransform != null)
{
RenderTransform.Changed -= RenderTransformChanged;
}
DetachedFromVisualTree?.Invoke(this, e);
}
/// <summary>
/// Calls the <see cref="OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs)"/> method
/// for this control and all of its visual descendants.
/// </summary>
/// <param name="e">The event args.</param>
protected virtual void OnDetachedFromVisualTreeCore(VisualTreeAttachmentEventArgs e)
{
Logger.Verbose(LogArea.Visual, this, "Detached from visual tree");
_visualRoot = null;
if (RenderTransform != null)
{
RenderTransform.Changed -= RenderTransformChanged;
}
OnDetachedFromVisualTree(e);
DetachedFromVisualTree?.Invoke(this, e);
e.Root?.Renderer?.AddDirty(this);
if (VisualChildren != null)
{
foreach (Visual child in VisualChildren.OfType <Visual>())
{
child.OnDetachedFromVisualTreeCore(e);
}
}
}
/// <summary>
/// Called when the control is removed from a visual tree.
/// </summary>
/// <param name="e">The event args.</param>
protected virtual void OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs e)
{
DetachedFromVisualTree?.Invoke(this, e);
}