private void Update <T>(ObservableArrayArgs <T> arg)
{
var numOfElement = 0;
Context = arg.Element;
switch (arg.Action)
{
case ObservableAction.Push:
arg.Renderer.Call(arg.Element, arg.Item, arg.Index);
break;
case ObservableAction.Add:
if (arg.Index == arg.Array.Length - 1)
{
arg.Renderer.Call(arg.Element, arg.Item, arg.Index);
return;
}
var div = new HTMLDivElement();
Context = div;
arg.Renderer.Call(div, arg.Item, arg.Index);
AppendChildList(arg.Element, div, arg.Index);
break;
case ObservableAction.Remove:
numOfElement = arg.Element.Children.Length / (arg.Array.Length + 1);
RemoveChildList(arg.Element, arg.Index, numOfElement);
break;
case ObservableAction.Move:
numOfElement = arg.Element.Children.Length / arg.Array.Length;
var newIndex = arg.Index;
var oldIndex = Array.IndexOf(arg.Array, arg.Item);
if (newIndex == oldIndex)
{
return;
}
var firstOldElementIndex = oldIndex * numOfElement;
var nodeToInsert = oldIndex < newIndex ? arg.Element.Children[(newIndex + 1) * numOfElement] : arg.Element.Children[newIndex * numOfElement];
for (var j = 0; j < numOfElement; j++)
{
arg.Element.InsertBefore(arg.Element.Children[firstOldElementIndex], nodeToInsert);
if (oldIndex > newIndex)
{
firstOldElementIndex++;
}
}
break;
case ObservableAction.Render:
ClearContextContent();
var length = arg.Array.Length;
var i = -1;
while (++i < length)
{
Context = arg.Element;
arg.Renderer.Call(arg.Element, arg.Array[i], i);
}
break;
}
}
private void NotifyArrayChanged(ObservableArrayArgs <T> arg)
{
var isBeingExecuted = _exeStack.Contains(this);
if (isBeingExecuted)
{
return;
}
_exeStack.Add(this);
_subscribers.ForEach((subscriber) => {
subscriber(arg);
});
_dependencies.ForEach((dpc) => {
dpc.NotifyChange();
});
_exeStack.Remove(this);
}