Constraints are not rendered

[nmandrelas]

Example program, the part with issue was directly copied from the examples.

defmodule Game.Counter do
  use TermUI.Elm

  alias TermUI.Event
  alias TermUI.Layout.Constraint
  def init(_opts), do: %{count: 0}

  def event_to_msg(%Event.Key{key: "q"}, _state), do: {:msg, :quit}
  def event_to_msg(_, _), do: :ignore

  def update(:quit, state), do: {state, [:quit]}

  def view(state) do
    stack(:vertical, [
      stack(:horizontal, [
        text("Visible 1"),
        text("Visible 2")
      ]),
      stack(:horizontal, [ #<- issue here
        {text("Not visible"), Constraint.length(15)},
        {text("Also not visible"), Constraint.fill()}
      ]),
      text("Also visible")
    ])
  end
end

Run output

Visible 1Visible 2
Also visible

Elixir ls dialyzer output on the line with the comment

 The function call will not succeed.
   
   TermUI.Component.Helpers.stack(:horizontal, [
     {%TermUI.Component.RenderNode{
        :cells => nil,
        :children => [],
        :content => binary(),
        :direction => nil,
        :height => nil,
        :style =>
          nil
          | %TermUI.Renderer.Style{
              :attrs => %MapSet{:map => MapSet.internal(_)},
              :bg => atom() | byte() | {byte(), byte(), byte()},
              :fg => atom() | byte() | {byte(), byte(), byte()}
            },
        :type => :text,
        :width => nil
      },
      %{
        :__struct__ => TermUI.Layout.Constraint.Fill | TermUI.Layout.Constraint.Length,
        :value => non_neg_integer()
      }},
     ...
   ])
   
   will never return since the 2nd arguments differ
   from the success typing arguments:
   
   (:horizontal | :vertical, [
     %TermUI.Component.RenderNode{
       :cells => nil | [map()],
       :children => [map()],
       :content => nil | binary(),
       :direction => :horizontal | nil | :vertical,
       :height => :auto | nil | non_neg_integer(),
       :style =>
         nil
         | %TermUI.Renderer.Style{
             :attrs => map(),
             :bg => atom() | byte() | {_, _, _},
             :fg => atom() | byte() | {_, _, _}
           },
       :type => :box | :cells | :empty | :stack | :text,
       :width => :auto | nil | non_neg_integer()
     }
   ])

Elixir

Erlang/OTP 28 [erts-16.2] [source] [64-bit] [smp:16:16] [ds:16:16:10] [async-threads:1] [jit:ns]
Elixir 1.19.4 (compiled with Erlang/OTP 28)

[pcharbon70]

Thank you for notifying me, will have a look and have a fix out soon. Very much appreciated.