private async void PresentInternal(IPresentable presentable, IPresentable presentableParent, Transform transform)
{
var zIndex = GetZIndex(presentable);
try
{
// 1) Execute the middleware chain. Order is important here.
if (_presentDelegates != null)
{
foreach (var middleware in _presentDelegates)
{
await middleware(this, presentable);
}
}
// 2) Load the controller view.
var view = await _viewFactory.CreateViewAsync(presentable.PrefabPath, presentable.Layer, zIndex, presentable.PresentOptions, transform);
if (view is null)
{
throw new PresentException(presentable, "View is null.");
}
// 3) Create the controller (or dispose view if the controller is dismissed at this point).
if (presentable.IsDismissed)
{
view.Dispose();
throw new OperationCanceledException();
}
else
{
presentable.CreateController(view);
}
_controllerMap.Add(presentable.Controller, presentable);
// 4) Dismiss the specified controllers if requested.
if ((presentable.PresentOptions & PresentOptions.DismissAll) != 0)
{
foreach (var p in _presentables)
{
if (p != presentable)
{
p.DismissCancel();
}
}
}
else if ((presentable.PresentOptions & PresentOptions.DismissCurrent) != 0)
{
presentableParent?.DismissCancel();
}
// 5) Dismiss controllers of the same type if requested (for singleton controllers only).
if ((presentable.PresentOptions & PresentOptions.Singleton) != 0)
{
foreach (var p in _presentables)
{
if (p != presentable && p.ControllerType == presentable.ControllerType)
{
p.DismissCancel();
}
}
}
}
catch (Exception e)
{
presentable.Dismiss(e);
}
}