initial commit

src/ui/QuantityBox.lua

@@ -0,0 +1,55 @@
+-- The "how many?" selector (DisplayChooseQuantityMenu, home/list_menu.asm):
+-- Up/Down step by 1 with 1..max roll-over, A confirms, B cancels.
+-- Shows a running price when opts.unitPrice is set.
+
+local Font = require("src.render.Font")
+
+local QuantityBox = {}
+QuantityBox.__index = QuantityBox
+QuantityBox.isOpaque = false
+
+function QuantityBox.new(game, opts)
+  local self = setmetatable({}, QuantityBox)
+  self.game = game
+  self.max = math.max(1, opts.max or 99)
+  self.qty = math.min(opts.start or 1, self.max)
+  self.unitPrice = opts.unitPrice
+  self.onDone = opts.onDone -- onDone(qty | nil on cancel)
+  return self
+end
+
+local function wrap(v, max)
+  if v < 1 then return max end
+  if v > max then return 1 end
+  return v
+end
+
+function QuantityBox:update(dt)
+  local input = self.game.input
+  if input:wasPressed("up") then
+    self.qty = wrap(self.qty + 1, self.max)
+  elseif input:wasPressed("down") then
+    self.qty = wrap(self.qty - 1, self.max)
+  elseif input:wasPressed("a") then
+    self.game.stack:pop()
+    if self.onDone then self.onDone(self.qty) end
+  elseif input:wasPressed("b") then
+    self.game.stack:pop()
+    if self.onDone then self.onDone(nil) end
+  end
+end
+
+function QuantityBox:draw()
+  local w = self.unitPrice and 11 or 7
+  local tx = 20 - w - 1
+  Font.drawBox(tx, 13, w, 3)
+  love.graphics.setColor(0, 0, 0, 1)
+  local s = ("×%02d"):format(self.qty) -- the multiply glyph tile
+  if self.unitPrice then
+    s = s .. (" ¥%d"):format(self.qty * self.unitPrice)
+  end
+  Font.draw(s, (tx + 1) * 8, 14 * 8)
+  love.graphics.setColor(1, 1, 1, 1)
+end
+
+return QuantityBox