private int ReplaceListRangeBySource(int index, int count, IEnumerable source)
{
var array = new TemplatedItem <T> [1];
var enumerator = source.GetEnumerator();
var list = GetList();
var replacedCount = 0;
while (replacedCount < count && enumerator.MoveNext())
{
DataTemplate selected;
var item = enumerator.Current;
if (_template is DataTemplateSelector selector)
{
selected = selector.SelectTemplate(item, container);
}
else
{
selected = _template;
}
if (index < list.Count)
{
var templated = list[index];
if (templated.Template == selected)
{
templated.Content.BindingContext = item;
}
else
{
templated.Template = selected;
templated.Content = (T)selected.CreateContent();
templated.Content.BindingContext = item;
array[0] = templated;
ReplaceListRange(index, 1, array);
}
}
else
{
var templated = new TemplatedItem <T>();
templated.Template = selected;
templated.Content = (T)selected.CreateContent();
templated.Content.BindingContext = item;
array[0] = templated;
InsertListRange(index, array);
}
replacedCount++;
index++;
}
return(replacedCount);
}
public void Add(T content)
{
if (IsReadOnly)
{
throw new Exception("this collection is read-only");
}
var item = new TemplatedItem <T>();
item.Content = content;
InsertListRange(GetList().Count, new[] { item });
}
private TemplatedItem <T> Template(object source)
{
var item = new TemplatedItem <T>();
if (_template is DataTemplateSelector selector)
{
item.Template = selector.SelectTemplate(source, container);
}
else
{
item.Template = _template;
}
item.Content = (T)item.Template.CreateContent();
item.Content.BindingContext = source;
return(item);
}
