protected override void RecycleElementCore(ElementFactoryRecycleArgs args)
{
var element = args.Element;
var key = RecyclePool.GetReuseKey(element);
m_recyclePool.PutElement(element, key, args.Parent);
}
protected override UIElement GetElementCore(ElementFactoryGetArgs args)
{
if (m_templates is null || m_templates.Count == 0)
{
throw new InvalidOperationException("Templates property cannot be null or empty.");
}
var winrtOwner = args.Parent;
var templateKey =
m_templates.Count == 1 ? m_templates.First().Key : OnSelectTemplateKeyCore(args.Data, winrtOwner);
if (string.IsNullOrEmpty(templateKey))
{
// Note: We could allow null/whitespace, which would work as long as
// the recycle pool is not shared. in order to make this work in all cases
// currently we validate that a valid template key is provided.
throw new InvalidOperationException("Template key cannot be empty or null.");
}
// Get an element from the Recycle Pool or create one
var element = m_recyclePool.TryGetElement(templateKey, winrtOwner) as FrameworkElement;
if (element is null)
{
// No need to call HasKey if there is only one template.
if (m_templates.Count > 1 && !m_templates.ContainsKey(templateKey))
{
string message = "No templates of key " + templateKey + " were found in the templates collection.";
throw new InvalidOperationException(message);
}
var dataTemplate = m_templates[templateKey];
element = dataTemplate.LoadContent() as FrameworkElement;
// Associate ReuseKey with element
RecyclePool.SetReuseKey(element, templateKey);
}
return(element);
}
public static void SetPoolInstance(DataTemplate dataTemplate, RecyclePool value) => dataTemplate.SetValue(PoolInstanceProperty, value);
