evan
6a9b082f97
ui.lua and hints.lua are compiled to LUA_32BITS bytecode (matching the firmware's Lua build) and linked into the binary. A new package.searchers entry checks them as the fallback after the SD card, so a local /.lua/lib/ui.lua still shadows the packaged one for debugging. Bytecode is ~40% smaller than source and loads without parsing. A fresh SD card with no make sdcard now has the platform available.
46 lines
1.6 KiB
Lua
46 lines
1.6 KiB
Lua
-- Button hints as a shared module rather than a firmware paint routine: what the strip looks
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-- like is composition, and only the device knows which roles exist to label.
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local hints = {}
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-- Reading order across the strip, so a device showing three of them still reads left to right.
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local ORDER = { "back", "left", "up", "down", "right", "confirm" }
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local function available()
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local roles = {}
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if input and input.getButtons then
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for _, role in ipairs(input.getButtons()) do roles[role] = true end
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end
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return roles
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end
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---Paints the labels this device can actually act on, and returns the height it used.
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---@param actions table<string, string> Label per Button role; roles the device lacks are skipped.
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---@param options table|nil `y`, `font`, `color`, and `background` overrides.
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function hints.draw(actions, options)
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options = options or {}
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local font = options.font or gui.FONT_SMALL
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local color = options.color or gui.color(0, 0, 0)
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local background = options.background or gui.color(255, 255, 255)
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local height = gui.getFontHeight(font) + 6
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local y = options.y or (gui.getHeight() - height)
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local roles = available()
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local labels = {}
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for _, role in ipairs(ORDER) do
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if roles[role] and actions[role] then labels[#labels + 1] = actions[role] end
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end
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gui.fillRect(0, y, gui.getWidth(), height, background)
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if #labels == 0 then return height end
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local slot = gui.getWidth() // #labels
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for index, label in ipairs(labels) do
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local left = slot * (index - 1) + (slot - gui.getTextWidth(font, label)) // 2
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gui.drawText(font, left, y + 3, label, color, gui.STYLE_NORMAL, background)
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end
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return height
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end
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return hints
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