Is it possible to bind multiple data to a component?

[wang-er-s]

in lua mvvm，i can do this,second parameter is a table,third para is a decorator,make a suit style let view show
self:bind("num", {"inventory.current_used", "inventory.capacity"},function(current_used, capacity)
    return ("%d/%d"):format(current_used, capacity)
end) --  "5/100"

in c#,I didn't expect any good solution. do you have any good idea? pls tell me ! thanks

[ryantrem]

ugui-mvvm is largely modeled after XAML bindings. Back in WPF XAML, we had something to achieve this called a MultiBinding, which aggregated multiple regular Bindings, and then specified an IMultiValueConverter. If ugui-mvvm had something like this, then in your example above, the second parameter would map to the multiple aggregated bindings, and the third parameter would map to the multi-converter.

I think this could be a good approach for ugui-mvvm, but would definitely require some work. I think something like this would make sense:

1. Factor out some of the core logic in the PropertyBinding class.
2. Create a MultiPropertyBinding class that has a collection of the factored out stuff from PropertyBinding. Imagine in the inspector having a collection of elements that look similar to what we see in PropertyBinding today, where each element has a binding source, a binding target, and optionally a converter. Additionally, it would have a target property just like PropertyBinding.
3. Introduce an IMultiValueConverter interface, and have it be a required property on the MultiPropertyBinding. This is the thing that would combine multiple property values into a single output value.