Topic: UI Spinbox: dynamic max value?

I am trying to adjust the max value of a spinbox depending on the amount of a ware. But for some reason this won't do. Code snippet:

         {
            widget = "box",
            name = "ware_options",
            orientation = "horizontal",
            spacing     = 10,
            children = {
               {
                  widget = "spinbox",
                  name   = "nr_wares",
                  w      = 120,
                  unit_w = 40,
                  value  = 1,
                  min    = 1,
                  max    = 5,
                  label  = "Amount",
               },

But for some reason i can't change this value. Code snippet to change:

      local water = 12
      print(wl.ui.MapView():get_child("nr_wares"), wl.ui.MapView():get_child("nr_wares").max, water)
      wl.ui.MapView():get_child("nr_wares").max = water

The print statement says:

SpinBox: 0x5784544364f0 nil     12

So the Spinbox is found, but the max property is nil. The documentation shows also no other function to change this: https://www.widelands.org/documentation/autogen_wl_ui/index.html#spinbox

Any hints?

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Oh yes... i just misinterpreted the header set_interval an didn't read the explanation.

Many thanks!

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Well the documentation is a comprehensive list of all known properties and values

Value list spinboxes are somewhat fiddly. Internally, a value list with N entries is implemented as a regular spinbox in interval 0 to (N-1) with a remapping for value i to the i-th array item. Changing that after creation is difficult to say the least.

I would suggest that if you want to use a spinbox, you can imitate that behaviour in Lua using Replacements: Initially create the spinbox as a regular spinner with interval 1 to 1, and then update your values for a size-N array by setting the interval 1 .. N and calling add_replacement(i, names[i]) for all i from 1 to N to ensure the i-th value is displayed as names[i]. And when reading out the value, don't forget that the spinbox selection represents an index into an array defined by you.

Alternatively consider using a dropdown, this has one of the most flexible interfaces of all widgets.

        on_changed = [[ include("map:scripting/callbacks.lua") explain() ]],

Lua syntax alert: This needs a semicolon or newline between the two function calls.

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