ludic/examples/library/ui_box.ludic
Orkuncakilkaya 19fcf60599 wip(0.S3): packages and examples migrated again from their pre-0.S sources in one run
ludic migrate state packages <every example program> packages/ludic.lab/example/plate.ludic
  1804 vars into 126 states, 64 into lets; 23498 edits in 460 files

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-25 15:31:34 +03:00

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# ui_box.ludic — what a host reads from outside the interface: ui_scale(), the scale it is drawn at
# (the renderer's), and ui_box("id"), where an element was laid out when its screen was last shown,
# in screen pixels (null for one that is not there) - to frame a 3D view beside a panel.
import "ludic.ui"
program UiBox {
numbers float
const PAGE: string = "<ui><style>.side { width: 100px; height: 60px; margin: 10px }</style><screen name='b'><p>title</p><div id='panel' class='side'/></screen></ui>"
function scale() -> float { return 1.5 }
entry (ui_st: mut UiState) {
let b = new UiBackend
b.scale = fn scale
ui_backend(ui_st, b)
ui_load_text(ui_st, PAGE, "b.xml")
ui_show(ui_st, "b", null, 20.0, 30.0, 800.0, 600.0)
let p = ui_box(ui_st, "panel")
let none = ui_box(ui_st, "nothing")
print(`scale {ui_scale(ui_st)} | panel {int(p.x)},{int(p.y)} {int(p.w)}x{int(p.h)} | missing {none == null}`)
}
}