Clickable Button Documentation?

_addon.name = 'testing'
_addon.author = 'me'
_addon.version = '0.0.1'
_addon.commands = {'testing'}

texts = require('texts') --to create the box
require('luau') --to make T{} work, I have no idea how to do box settings without this lol 

--on addon load, create box
windower.register_event('load', function (...)

  generate_text()

end)

--this SHOULD only fire on left click, but...
function left_click_function()
  windower.add_to_chat(216, 'Success!')
end


--generate the box on addon load
function generate_text()

  --define some text
  BOX_CONTENTS = '\\cs(0, 0, 0)' .. 'HELLO! I AM A BOX. ' .. '\\cr\n' .. '\\cr\n'

  --create the box
  ACTUAL_BOX = texts.new(windowSettings) 

  --put the text in the box
  ACTUAL_BOX:text(BOX_CONTENTS)

  --and make it all visible
  ACTUAL_BOX:visible(true)

  --now, I naively expect this to "associate" the event with the box...
  ACTUAL_BOX:register_event('left_click', left_click_function())

end

--settings for the box, you can ignore this
windowSettings = T{}
windowSettings.pos = T{}
windowSettings.pos.x = 400
windowSettings.pos.y = 400
windowSettings.bg = T{}
windowSettings.bg.red = 150
windowSettings.bg.green = 150
windowSettings.bg.blue = 150

ACTUAL_BOX:register_event('left_click', left_click_function())

ACTUAL_BOX:register_event('left_click', left_click_function)

--global mouse handler with hit-test against the box
windower.register_event('mouse', function(type, x, y, delta, blocked)
    if type ~= 1 then return end          -- only left click down
    if not ACTUAL_BOX then return end     -- box not created yet
    if not ACTUAL_BOX:visible() then return end

    local bx, by = ACTUAL_BOX:pos()
    local bw, bh = ACTUAL_BOX:extents()

    if x >= bx and x <= bx + bw and y >= by and y <= by + bh then
        left_click_function()
        return true  -- consume the click
    end
end)

windower.register_event('mouse', function(type, x, y, delta, blocked)
    if type ~= 1 then return end
    
    if hit_test(BOX_A, x, y) then box_a_clicked() return true end
    if hit_test(BOX_B, x, y) then box_b_clicked() return true end
    if hit_test(BOX_C, x, y) then box_c_clicked() return true end
end)

function hit_test(box, x, y)
    if not box or not box:visible() then return false end
    local bx, by = box:pos()
    local bw, bh = box:extents()
    return x >= bx and x <= bx + bw and y >= by and y <= by + bh
end