/// <summary>
/// Clears the cache when the set of templates change
/// </summary>
/// <param name="bo"></param>
/// <param name="oldval"></param>
/// <param name="newval"></param>
public static void TemplatesChanged(BindableObject bo, DataTemplateCollection oldval, DataTemplateCollection newval)
{
var ts = bo as TemplateSelector;
if (ts == null) return;
if (oldval != null) oldval.CollectionChanged -= ts.TemplateSetChanged;
newval.CollectionChanged += ts.TemplateSetChanged;
ts.Cache = null;
}
/// <summary>
/// Clears the cache when the set of templates change
/// </summary>
/// <param name="bo"></param>
/// <param name="oldval"></param>
/// <param name="newval"></param>
public static void TemplatesChanged(BindableObject bo, DataTemplateCollection oldval, DataTemplateCollection newval)
{
var ts = bo as TemplateSelector;
if (ts == null)
{
return;
}
if (oldval != null)
{
oldval.CollectionChanged -= ts.TemplateSetChanged;
}
newval.CollectionChanged += ts.TemplateSetChanged;
ts.Cache = null;
}
static Dictionary <Type, Windows.UI.Xaml.DataTemplate> MakeTypeToTemplateMap(DataTemplateCollection templateCollection)
{
var map = new Dictionary <Type, Windows.UI.Xaml.DataTemplate>();
foreach (var template in templateCollection)
{
var targetType = DataTemplate.GetTargetType(template);
if (targetType == null)
{
throw new Exception("TargetTypeProperty must be set your Type. (restrict only TypeBasedTemplateSelector insided DateTemplate)");
}
if (map.ContainsKey(targetType))
{
throw new Exception("Duplicate TargetTypeProperty present Type's in DataTemplate. Ensure indivisual Type to set DataTemplate with TargetType.");
}
map.Add(targetType, template);
}
return(map);
}
/// <summary>
/// Initialize the TemplateCollections so that each
/// instance gets it's own collection
/// </summary>
public TemplateSelector()
{
Templates = new DataTemplateCollection();
}
/// <summary>
/// Creates an instance of a <see cref="XamlTemplateSelector"/> object.
/// </summary>
public XamlTemplateSelector()
{
_templates = new DataTemplateCollection();
}
/// <summary>
/// Initialize the TemplateCollections so that each
/// instance gets it's own collection
/// </summary>
public TemplateSelector()
{
Templates = new DataTemplateCollection();
}
