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feat(ui): scroll-top holds a scroll box at an offset, on-scroll, and ui_scroll_set

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-24 22:00:21 +03:00
parent cf8b9e425e
commit abf45ef9db
10 changed files with 85 additions and 1 deletions
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4
packages/ludic.ui/scroll.ludic
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@ -32,9 +32,11 @@ function sc_walk(n: UiNode, live: bool) -> void {
if n.kind == UI_SCROLL {
let room = n.ch - ly_vin(n)
let most = Math.max(n.content_h - ly_vin(n) - room, 0.0)
var off = sc_get(n.key)
let held = sc_held(n, sc_get(n.key), live)
var off = held
if live { off = sc_input(n, off, room, most) }
off = Math.clamp(off, 0.0, most)
if live and off != Math.clamp(held, 0.0, most) { ui_fire(n, "scroll", Value.float(off / ui_px(1.0))) }
sc_put(n.key, off)
n.scroll_y = off
if off != 0.0 {