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ludic.ui: the pointer looks through a box with no size; a control's parts answer :hover

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From the user's play, reproduced on Maroon Lake's customisation screen with the pointer scripted over
each control (the lab's R3D_CLICKS): nothing on it was ever pressed or hovered.

- A screen's root <div> round a positioned panel (a component's root holding the kit Screen's
  modal) lays out to 0x0, and the hit test (fr_pick) and :hover (fr_under) only walked into a child
  whose box held the point - so nothing under it was reachable. A box with no size holds no point and
  clips nothing: both look through it now (fr_empty), without hovering it.
- A control's parts (a select's < and >, a range's thumb) are made by ct_part, which never set
  `hovered`: `select .ui-prev:hover` could not match anywhere. It is set as an element's is.

Golden ui_pointer_through: the panel's button pressed and hovered through the empty root, and a
select's > hovered (before this: pressed 0, hovered 0). The 36 ui examples pass.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-29 13:26:33 +03:00
parent 06ecc5cd8e
commit 9b3d3e3298
5 changed files with 67 additions and 2 deletions
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1
tools/ludic-cli/test.ludic
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@ -1246,6 +1246,7 @@ function cmd_dev_test() -> int {
controller_case("library/ui_box", "", "scale 1.5 | panel 35,75 150x90 | missing 1", "ui_box.ludic (L11: ui_scale and ui_box, the interface's scale and an element's laid-out box, read from outside)")
controller_case("library/ui_emit_click", "", "got 2 | pressed: got 1", "ui_emit_click.ludic (L11: a component's `emit click` reaches its user's on-click, by the mouse and by a press)")
controller_case("library/ui_select_arrows", "", "prev 0 next next 2", "ui_select_arrows.ludic (L11: a select's < steps back and its > forward)")
controller_case("library/ui_pointer_through", "", "pressed 1, hovered #4a5058; > hovered 1", "ui_pointer_through.ludic (L11: the pointer looks through a root with no size to a positioned panel's button; a select's > answers :hover)")
controller_case("library/ui_submit", "", "[hi] chat '' | [hi][yo][Ada] chat '' name 'Ada'", "ui_submit.ludic (L11: on-submit on a text field by Enter or A, clear-on-submit, the focus kept)")
controller_case("library/ui_zoom", "", "plain 100 pad 10 text 16 h 20 | half 50 pad 5 text 8 h 10 | half of twice 100 | fit 50 em 16", "ui_zoom.ludic (L11: zoom scales a subtree's lengths, text and layout, multiplies, and takes min() and a length over a length)")
controller_case("library/ui_hold", "", "31 frames 500 ms t 500 | 121 frames 500 ms t 500 | pad 16 frames 250 ms t 250 | dududu", "ui_hold.ludic (L11: on-hold every frame a button is held, by the pointer or A, with dt and t on the clock at any rate)")