public IRegisteredCommandElement Register(UIElement sourceElement, object target)
{
if (sourceElement == null)
{
throw new ArgumentNullException(nameof(sourceElement));
}
if (target == null)
{
throw new ArgumentNullException(nameof(target));
}
var coll = new KeyShortcutCollection();
foreach (var provider in commandInfoProviders)
{
coll.Add(provider.Value, target);
}
var cmdElem = new RegisteredCommandElement(this, sourceElement, coll, target);
foreach (var c in commandTargetFilterProviders)
{
var filter = c.Value.Create(target);
if (filter == null)
{
continue;
}
cmdElem.AddFilter(filter, c.Metadata.Order);
}
return(cmdElem);
}
public CommandTargetStatus Execute(Guid group, int cmdId, object args, ref object result)
{
if (registeredCommandElement?.TryGetTargetOrUnregister() == null)
{
registeredCommandElement = null;
return(CommandTargetStatus.NotHandled);
}
return(registeredCommandElement.Execute(group, cmdId, args, ref result));
}
public CommandTargetStatus CanExecute(Guid group, int cmdId)
{
if (registeredCommandElement?.TryGetTargetOrUnregister() == null)
{
registeredCommandElement = null;
return(CommandTargetStatus.NotHandled);
}
return(registeredCommandElement.CanExecute(group, cmdId));
}
public NextCommandTarget(RegisteredCommandElement owner, ICommandTargetFilter filter)
{
ownerWeakRef = new WeakReference(owner);
filterWeakRef = new WeakReference(filter);
}
public CommandTargetCollection(RegisteredCommandElement registeredCommandElement) => this.registeredCommandElement = registeredCommandElement;
