protected override Task <IEnumerable <IMenuItem> > LoadItems(CancellationToken cancellationToken)
{
var items = new List <IMenuItem>();
var myType = GetType();
foreach (var menuItemMethod in myType.GetMethods(BindingFlags.Instance | BindingFlags.Public))
{
if (menuItemMethod.DeclaringType == typeof(MenuSkeleton))
{
continue;
}
if (menuItemMethod.DeclaringType == typeof(SimpleMenu))
{
continue;
}
if (menuItemMethod.DeclaringType == typeof(object))
{
continue;
}
var isVoid = menuItemMethod.ReturnType == typeof(void);
var isTask = typeof(Task).IsAssignableFrom(menuItemMethod.ReturnType);
var isSubMenu = typeof(IMenu).IsAssignableFrom(menuItemMethod.ReturnType);
if (!isVoid && !isTask && !isSubMenu)
{
continue;
}
var parameters = menuItemMethod.GetParameters();
if (isVoid)
{
if (parameters.Length == 1 && parameters[0].ParameterType == typeof(IMenuContext))
{
var invokeMethod = (Action <IMenuContext>)Delegate.CreateDelegate(typeof(Action <IMenuContext>), this, menuItemMethod);
items.Add(new ActionMenuItem(DescriptionHelper.Get(menuItemMethod), invokeMethod));
}
else if (parameters.Length == 0)
{
var invokeMethod = (Action)Delegate.CreateDelegate(typeof(Action), this, menuItemMethod);
items.Add(new ActionMenuItem(DescriptionHelper.Get(menuItemMethod), ctx => invokeMethod()));
}
}
else if (isSubMenu)
{
if (parameters.Length == 1 && parameters[0].ParameterType == typeof(IMenuContext))
{
throw new NotSupportedException("Passing IMenuContext to a menu factory method is no longer supported");
}
else if (parameters.Length == 0)
{
var invokeMethod = (Func <IMenu>)Delegate.CreateDelegate(typeof(Func <IMenu>), this, menuItemMethod);
items.Add(invokeMethod());
}
}
else
{
if (parameters.Length == 1 && parameters[0].ParameterType == typeof(IMenuContext))
{
var invokeMethod = (Func <IMenuContext, Task>)Delegate.CreateDelegate(typeof(Func <IMenuContext, Task>), this, menuItemMethod);
items.Add(new ActionMenuItem(DescriptionHelper.Get(menuItemMethod), invokeMethod));
}
else if (parameters.Length == 0)
{
var invokeMethod = (Func <Task>)Delegate.CreateDelegate(typeof(Func <Task>), this, menuItemMethod);
items.Add(new ActionMenuItem(DescriptionHelper.Get(menuItemMethod), r => invokeMethod()));
}
}
}
return(Task.FromResult(items.AsEnumerable()));
}
public MenuItem()
{
Title = Regex.Replace(DescriptionHelper.Get(GetType()), " menu item$", "");
}
protected SimpleMenu() : base(string.Empty)
{
Title = Regex.Replace(DescriptionHelper.Get(GetType()), " menu$", "");
}