noe/arthur
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

A lane is a generic row of symbol clips

Browse source 
A lane was a drawing lane: the only thing that could go in one was a one-frame
held cel, and every other symbol instance stayed a permanent root row of its
own. Those are not two kinds of timing, they are one kind with two creation
policies. `lane/place-symbol` drops any library symbol in as a clip that plays
naturally at speed one, `lane/adopt` moves an instance that is already in the
document into a lane keeping its source, span, playback and corrections, and
`append-drawing`/`overwrite-drawing` keep being the policy that makes a new
empty symbol a one-frame hold. The child shape they produce is the same.

Both new commands claim their interval through `blank` before they write, so
the partition rule is unchanged and unduplicated: placing into occupied lane
time trims, removes or splits the incumbents, and a lane still never stores an
overlap. Real compositing overlap is another lane, where the order is explicit.

Creating a symbol with nothing aimed now makes a lane and a clip in it instead
of a loose root instance, and a pool drop prefers an explicitly targeted lane,
then the selected one, and makes a lane only when there is neither. That is
what stops the row-per-symbol growth coming back in through the drop path, and
it is why `add-lane` now takes a z in front of the existing root nodes and
calls what it makes a "lane" rather than "drawings".

The timeline learned the two gestures that a generic lane needs. A clip body
dragged over another lane's track previews there as a dashed block and lands
through `::adopt-in-lane`; the track is found with `elementsFromPoint` and its
selection read back off the element, because a pointer capture does not
retarget. A pool drop over an existing lane previews as a dashed clip inside
that lane instead of a temporary new row that appears and then vanishes --
which also needed the drag-leave check to be geometric, since inserting the
preview changes the element under the pointer and Chromium then reports a leave
with no related target. Lanes are renameable from their label, by double-click,
F2, or the pencil, through `::rename-node`.

`symbol/lane-cels` is `symbol/lane-clips`, and the vocabulary table in the
handoff now separates the two words it had merged: a clip is an instance in a
lane, and a cel is specifically the one-frame held source that drawing creation
makes. Keeping `cel` for the policy is what lets the lane stop being about
drawings at all.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Your Name 2026-10-01 15:13:07 -04:00
parent 26ada03591
commit 5ebe776ce4
12 changed files with 590 additions and 174 deletions
Download patch file Download diff file Expand all files Collapse all files

6
static/arthur/app.css
View file

@ -1000,6 +1000,9 @@ button.share-button:hover, button.share-button.on { filter: brightness(1.1); }
.tl-label:hover:not(.on) { background: #fff; }
.tl-label .name { min-width: 0; overflow: hidden; text-overflow: ellipsis; }
.tl-label .kind { color: var(--dim); }
.tl-name-input { min-width: 0; flex: 1; font: inherit; }
.tl-rename { margin-left: auto; padding: 0 3px; border: 0; background: none; color: var(--dim); }
.tl-rename:hover { color: var(--fg); }
/* A fixed-width cell whether or not there is a triangle in it, so names at the
same depth line up down the column. */
@ -1081,7 +1084,8 @@ button.share-button:hover, button.share-button.on { filter: brightness(1.1); }
}
/* The preview row of a drop in flight: its own length, where it would start. */
.tl-span.ghost, .tl-label.ghost { pointer-events: none; }
.tl-span.ghost, .tl-label.ghost, .tl-cel.ghost { pointer-events: none; }
.tl-cel.ghost { background: transparent; border: 1px dashed var(--sel); color: var(--sel); }
/* A row being dragged over another: into an instance, or grouped with a node,
by its middle; in front of it or behind it, by its top or bottom edge. */