evan
f7c5cc09ba
A node was a Lua table of ~625 bytes, of which 21 keys pushed it over a
power-of-two hash boundary and eight were style copies inheritance had
splattered down from its parent. A 400 node screen cost ~250 KB and could not
coexist with wifi's buffers.
The tree now lives in src/ui/layout.h as a 16 byte struct in a flat arena, and
splits by lifetime: Node holds what hit testing and repainting need forever,
Spec holds what only measure/place read and is dropped when layout ends. Style
is sparse and resolved by walking parents, so a node naming no colours costs
nothing. Re-layout rebuilds from Lua rather than retaining the inputs.
401 nodes: 8218 B steady, 21050 B peak
Lua: ~250000 B steady
sdcard/lib/ui.lua stays the toolkit and keeps every constructor signature, but
returns integer handles: 627 lines to 374. Composition, the palette and custom
painters are still Lua on the SD card; only primitives now need a reflash.
BREAKING CHANGE: ui constructors return handles, not tables. Use
ui.setText(id, text) and keep per-node app data in a table keyed by id.
26 lines
692 B
Lua
26 lines
692 B
Lua
local ui = require("ui")
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local keyboard = require("keyboard")
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local screen, valueLabel
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local function show(prefix, value)
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ui.setText(valueLabel, value == "" and "type something" or prefix .. value)
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end
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function init()
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valueLabel = ui.text("type something", {w = "fill"})
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screen = ui.screen(ui.box{pad = 8, gap = 5,
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valueLabel,
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keyboard.new{
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max_length = 40,
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on_change = function(value) show("value: ", value) end,
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on_submit = function(value) show("submitted: ", value) end,
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},
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})
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log.info("keyboard test ready")
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end
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function draw() screen:draw() end
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function on_touch_down(x, y) screen:down(x, y) end
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function on_touch_up(x, y) screen:up(x, y) end
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