internal IDisposable OpenDragAndDrop(DragView dragView)
{
#if __WASM__ || __SKIA__
Grid rootElement = _window;
#else
Grid rootElement = _main;
#endif
if (rootElement is null)
{
return(Disposable.Empty);
}
if (_dragRoot is null)
{
_dragRoot = new DragRoot();
rootElement.Children.Add(_dragRoot);
}
_dragRoot.Show(dragView);
return(Disposable.Create(Remove));
void Remove()
{
_dragRoot.Hide(dragView);
if (_dragRoot.PendingDragCount == 0)
{
rootElement.Children.Remove(_dragRoot);
_dragRoot = null;
}
}
}
public DragOperation(Window window, IDragDropExtension?extension, CoreDragInfo info, ICoreDropOperationTarget?target = null)
{
_extension = extension;
Info = info;
_target = target ?? new DropUITarget(window); // The DropUITarget must be re-created for each drag operation! (Caching of the drag ui-override)
_view = new DragView(info.DragUI as DragUI);
_viewHandle = window.OpenDragAndDrop(_view);
_viewOverride = new CoreDragUIOverride(); // UWP does re-use the same instance for each update on _target
}
public void Hide(DragView view)
{
Children.Remove(view);
}
public void Show(DragView view)
{
view.IsHitTestVisible = false;
Children.Add(view);
}
