How about this feature for kivy lang?

I am new to kivy lang, and I am fascinated by it. I was trying to use kivy to build a tree layout UI, where each node in the tree should be a text input, and the tree may be dynamic. So I am wondering if the kivy lang can be made more powerful by adding conditions and for loops. Here is an imaginary kivy file with the new power on:

RootWidget:

    # a conditional example
    Button if root.need_button:
           text: 'press me'
    else Label:
           text: 'feedback'

   # a more complex one
   Button if root.need_confirm:
          text: 'Confirm'
   else Label if root.need_label:
          text: 'Nice Job!'
   else Widget:
          # empty widget here...

   # here is a for loop example
   Rectangle for data in root.data:
         pos: data.pos
         size: data.size

As I am new to kivy lang, clearly my idea could be totally out of place. Just ask around to see if this proposal is possible at all or plausible at all.

[dessant]

We would suggest making a pr if you’d like to see if your proposal is viable, but we don’t plan to work on this in its current form.

[langit]

@KeyWeeUsr that switch_with is a nice option, however it might not be as flexible. A cooked up example of interest may look like this:

Root:
   Button if root.status == 0:
      text: "place an order" 
      on_press: lambda: root.order_status = 1
   else TextInput if root.status == 1:
      on_key: lambda key: root.status = 2 if key.name == 'enter' else 1
   else Button if root.status == 2:
       text: "confirm order"
       on_press: lambda: root.status = 3
   else Label:
       text: "order confirmed"

As for efficiency, an idea is that kv could be translated into python equivalent.