public UIElement GetElement(ElementFactoryGetArgs args)
{
var selectedTemplate = Template ?? TemplateSelector.SelectTemplate(args.Data, null);
var recyclePool = RecyclePool.GetPoolInstance(selectedTemplate);
UIElement element = null;
if (recyclePool != null)
{
// try to get an element from the recycle pool.
element = recyclePool.TryGetElement(string.Empty /* key */, args.Parent as FrameworkElement);
}
if (element == null)
{
// no element was found in recycle pool, create a new element
element = selectedTemplate.LoadContent() as FrameworkElement;
// Template returned null, so insert empty element to render nothing
if (element == null)
{
element = new Rectangle {
Width = 0,
Height = 0
};
}
// Associate template with element
element.SetValue(RecyclePool.OriginTemplateProperty, selectedTemplate);
}
return(element);
}
public void RecycleElement(ElementFactoryRecycleArgs args)
{
var element = args.Element;
DataTemplate selectedTemplate = Template ??
element.GetValue(RecyclePool.OriginTemplateProperty) as DataTemplate;
var recyclePool = RecyclePool.GetPoolInstance(selectedTemplate);
if (recyclePool == null)
{
// No Recycle pool in the template, create one.
recyclePool = new RecyclePool();
RecyclePool.SetPoolInstance(selectedTemplate, recyclePool);
}
recyclePool.PutElement(args.Element, string.Empty /* key */, args.Parent);
}
public UIElement GetElement(ElementFactoryGetArgs args)
{
var selectedTemplate = Template ?? TemplateSelector.SelectTemplate(args.Data, null);
// Check if selected template we got is valid
if (selectedTemplate == null)
{
selectedTemplate = TemplateSelector.SelectTemplate(args.Data, null);
if (selectedTemplate == null)
{
// Still nullptr, fail with a reasonable message now.
throw new InvalidOperationException("Null encountered as data template. That is not a valid value for a data template, and can not be used.");
}
}
var recyclePool = RecyclePool.GetPoolInstance(selectedTemplate);
UIElement element = null;
if (recyclePool != null)
{
// try to get an element from the recycle pool.
element = recyclePool.TryGetElement(string.Empty /* key */, args.Parent as FrameworkElement);
}
if (element == null)
{
// no element was found in recycle pool, create a new element
element = selectedTemplate.LoadContent() as FrameworkElement;
// Template returned null, so insert empty element to render nothing
if (element == null)
{
element = new Rectangle {
Width = 0,
Height = 0
};
}
// Associate template with element
element.SetValue(RecyclePool.OriginTemplateProperty, selectedTemplate);
}
return(element);
}
public static void SetPoolInstance(DataTemplate dataTemplate, RecyclePool value)
{
//dataTemplate.SetValue(s_poolInstanceProperty, value);
s_templatesToPools.Remove(dataTemplate);
s_templatesToPools.Add(dataTemplate, value);
}
public static void SetPoolInstance(DataTemplate dataTemplate, RecyclePool value)
{
AttachablePropertyServices.SetProperty(dataTemplate, PoolInstanceProperty, value);
}