evan
1adf121dc6
sys.startApp(path, args) tears the runtime down and starts over from a file, and keeps nothing else: no history, no title, no app identity. All of that can ride in the arguments, so it does, and sdcard/.lua/lib/nav.lua is the single writer of that table. nav owns the back stack, the bar's title and /.lua/data/<AppId>, which means the launcher, what "back" reaches and how deep a route nests are editable on the card rather than in a reflash. Apps call nav.launch, nav.replace and nav.back; sys.startApp has one caller. Boot passes no arguments at all, which is how main.lua tells a cold start from a navigation and opens its own launcher, replacing the home field the runtime used to read. Arguments cross as JSON, so history is a list of tables rather than a packed string, and an app passing something JSON cannot carry sees the error at its own nav call.
63 lines
1.6 KiB
Lua
63 lines
1.6 KiB
Lua
local nav = require "nav"
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local ui = require "ui"
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local PAD, GAP = 12, 8
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---@class HomeApp : SlateApp
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local M = {}
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local names = {}
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local function card(name, side)
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return ui.button {
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w = side,
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h = side,
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justify = "center",
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align = "center",
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on_click = function()
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nav.launch(name)
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end,
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ui.label(name, { font = screen.FONT_UI, fit = side - 16 }),
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}
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end
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function M.init()
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for _, name in ipairs(fs.listDirs "/.lua/apps") do
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if name ~= "Home" then
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names[#names + 1] = name
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end
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end
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table.sort(names)
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log.info "home ready"
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end
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function M.node()
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local side, cols = ui.cardSide(math.max(#names, 1), PAD, GAP)
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-- Rows are filled before ui.box() sees them: the constructor moves a spec's array part
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-- into its children, so anything appended afterwards is never laid out.
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local rows = {}
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for _, name in ipairs(names) do
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local row = rows[#rows]
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if not row or #row >= cols then
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row = {}
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rows[#rows + 1] = row
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end
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row[#row + 1] = card(name, side)
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end
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-- Centred left to right as a unit, still top aligned: the gaps inside the grid are
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-- fixed, so the leftover width belongs beside the block, not to its last column.
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local items = { pad = PAD, gap = GAP, w = "fill", h = "fill", align = "center" }
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local gridW = cols * side + (cols - 1) * GAP
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for _, row in ipairs(rows) do
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row.row, row.gap, row.w = true, GAP, gridW
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items[#items + 1] = ui.box(row)
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end
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if #rows == 0 then
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items[#items + 1] = ui.text("no apps in /.lua/apps", { color = ui.theme.muted })
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end
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return ui.box(items)
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end
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return M
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