public iOSViewSource(CollectionView.RenderedViews.CollectionView element, List <DataTemplate> dataTemplates)
{
_weakElement = new WeakReference <CollectionView.RenderedViews.CollectionView>(element);
_createdCells = new Dictionary <long, WeakReference <iOSViewCell> >();
_dataTemplates = dataTemplates;
var elementItemsSource = element.ItemsSource;
_dataSource = elementItemsSource?.Cast <object>().ToList();
if (_dataSource == null)
{
return;
}
_multipleCellTemplates = element.ItemTemplate is DataTemplateSelector;
if (!_multipleCellTemplates)
{
// Cache only support single DataTemplate
_viewCellHolderCellHolderQueue = new UIViewCellHolderQueue(
element.ViewCacheSize,
() => CreateViewCellHolder());
_viewCellHolderCellHolderQueue.Build();
}
}
public OnControlScrollChangedListener(
CollectionViewRenderer nativeView,
CollectionView.RenderedViews.CollectionView element)
{
_weakNativeView = new WeakReference <CollectionViewRenderer>(nativeView);
_element = element;
}
public RecycleViewAdapter(CollectionView.RenderedViews.CollectionView element, CollectionViewRenderer nativeView, RecyclerView parentView, Context context)
{
_element = element;
_weakNativeView = new WeakReference <CollectionViewRenderer>(nativeView);
_weakParentView = new WeakReference <RecyclerView>(parentView);
_context = context;
_elementItemsSource = element.ItemsSource;
_dataSource = _elementItemsSource?.Cast <object>().ToList() ?? new List <object>();
_formsViews = new List <WeakReference <ViewCell> >();
if (_element.ItemTemplate is not DataTemplateSelector)
{
// Cache only support single DataTemplate
_viewHolderQueue = new ViewHolderQueue(element.ViewCacheSize, () => CreateViewHolder());
_viewHolderQueue.Build();
}
_notifyCollectionChanged = _elementItemsSource as INotifyCollectionChanged;
if (_notifyCollectionChanged != null)
{
_notifyCollectionChanged.CollectionChanged += OnCollectionChanged;
}
}
public ResponsiveGridLayoutManager(Context context, CollectionView.RenderedViews.CollectionView element)
: base(context, 1)
{
_context = context;
_weakElement = new WeakReference <CollectionView.RenderedViews.CollectionView>(element);
_spanNeedsCompute = true;
}
public DragAnDropItemTouchHelperCallback(CollectionView.RenderedViews.CollectionView collection, RecycleViewAdapter recycleViewAdapter, ICommand onDragAndDropStart = null, ICommand onDragAndDropdEnded = null)
{
_collection = collection;
_recycleViewAdapter = recycleViewAdapter;
_onDragAndDropStart = onDragAndDropStart;
_onDragAndDropdEnded = onDragAndDropdEnded;
}
public void Initialize(ViewCell formsCell, UIView view, CollectionView.RenderedViews.CollectionView parent)
{
FormsCell = formsCell;
// A previous view may have been added in a different data source
ContentView.ViewWithTag(InnerViewTag)?.RemoveFromSuperview();
view.Tag = InnerViewTag;
ContentView.AddSubview(view);
}
public static int ComputeSpan(int availableWidth, CollectionView.RenderedViews.CollectionView element)
{
int itemSpace = PlatformHelper.Instance.DpToPixels(element.ItemSpacing);
int leftPadding = PlatformHelper.Instance.DpToPixels(element.CollectionPadding.Left);
int rightPadding = PlatformHelper.Instance.DpToPixels(element.CollectionPadding.Right);
if (element.ItemWidth == 0)
{
element.ItemWidth = element.ComputeItemWidth(availableWidth);
}
int itemWidth = PlatformHelper.Instance.DpToPixels(element.ItemWidth, PlatformHelper.Rounding.Floor);
int columnCount = 0;
while (true)
{
columnCount++;
int interPadding = itemSpace * (columnCount - 1);
int totalWidth = itemWidth * columnCount + interPadding + leftPadding + rightPadding;
if (totalWidth > availableWidth)
{
break;
}
}
if (--columnCount == 0)
{
InternalLogger.Error(
"The CollectionPadding, ItemSpacing and ItemWidth specified doesn't allow a single column to be displayed");
return(1);
}
return(columnCount);
}
public void Bind(object dataContext, CollectionView.RenderedViews.CollectionView parent)
{
FormsCell.BindingContext = dataContext;
FormsCell.Parent = parent;
}
public void Bind(object context, CollectionView.RenderedViews.CollectionView parent)
{
_viewCell.BindingContext = context;
_viewCell.Parent = parent;
}
