void OnItemSelected(object sender, GenGridItemEventArgs e)
{
GengridItemContext context = e.Item.Data as GengridItemContext;
Element.SelectedItem = context.Data;
(Element as IGridViewController)?.SendItemSelected(new SelectedItemChangedEventArgs(context.Data, _itemList.IndexOf(context.Data)));
}
View CreateOrGetRealView(GengridItemContext context)
{
if (context.RealizedView != null)
{
return(context.RealizedView);
}
var realView = CreateView(Element.ItemTemplate);
realView.BindingContext = context.Data;
realView.Parent = Element;
context.RealizedView = realView;
return(realView);
}
void OnItemFocused(object sender, GenGridItemEventArgs e)
{
if (e.Item == null)
{
return;
}
GengridItemContext context = e.Item.Data as GengridItemContext;
if (context.RealizedView == null)
{
context.RealizedView = CreateOrGetRealView(context);
}
(Element as IGridViewController)?.SendItemFocused(new GridViewFocusedEventArgs(context.Data, context.RealizedView, true));
}
EvasObject GetGridViewContent(object data, string part)
{
GengridItemContext context = (GengridItemContext)data;
if (context.RealizedView == null)
{
context.RealizedView = CreateOrGetRealView(context);
}
if (part == "elm.swallow.icon")
{
var renderer = Platform.GetOrCreateRenderer(context.RealizedView);
(renderer as LayoutRenderer)?.RegisterOnLayoutUpdated();
return(renderer.NativeView);
}
return(null);
}
void UpdateItemsSource()
{
Control.Clear();
_gengridItemDic.Clear();
_itemHandleDic.Clear();
_itemList.Clear();
if (_collectionChanged != null)
{
_collectionChanged.CollectionChanged -= OnCollectionChanged;
_collectionChanged = null;
}
if (Element.ItemsSource == null)
{
return;
}
foreach (var item in Element.ItemsSource)
{
var context = new GengridItemContext
{
Data = item,
RealizedView = null,
};
var gridItem = Control.Append(_gridItemClass, context);
IntPtr handle = gridItem;
_itemHandleDic.Add(handle, gridItem);
_gengridItemDic.Add(item, gridItem);
_itemList.Add(item);
}
if (Element.ItemsSource is INotifyCollectionChanged collection)
{
_collectionChanged = collection;
collection.CollectionChanged += OnCollectionChanged;
}
}
