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M7: area type auto size and shrink text to fit

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Area Type Options gain a fit: none, autoHeight (Illustrator's Auto Size:
the frame's height follows the text after every edit, resolved in
refresh_bounds inside the edit so it shares the edit's undo step) and
shrinkText {minPercent} (beyond Illustrator: overflowing text scales its
sizes, leading and baseline shifts down at layout time by the largest
factor, in 0.1 pt steps of the first run, that fits). The Auto Size New
Area Type preference now applies. text.areaOptions and document.inspect
report overflow and the shrink factor; the Area Type Options dialog
offers fit and first baseline as dropdowns.
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haven
2026-10-08 14:48:25 -07:00
parent a89f914119
commit 674aef95b0
18 changed files with 871 additions and 35 deletions
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@@ -2217,6 +2217,34 @@ again, so SVG, PDF and EPS show the aligned text.
{"name":"run_command","arguments":{"command":"text.areaOptions","params":{"verticalAlign":"center"}}}
```
## Fitting area type: Auto Size, Shrink Text to Fit, overflow
`text.areaOptions` (and `text.create`'s `area`, `text.createInPath` in area mode) take a `fit`:
- `none` (default): the frame keeps its size; text that doesn't fit overflows (the red "+").
- `autoHeight`: Auto Size. After every edit (typing, `text.editRange`, character and paragraph changes, a new
width) the frame's bottom moves to just below the last line plus the inset, in the same undo step as the edit.
In several columns the frame gets the least height (to 0.01 pt) at which the columns hold the text. It applies
to rectangular frames of horizontal type in one row; `height` is ignored while it is on, and setting the height
by hand (a handle drag, `text.reshapeArea` moving the bottom) turns it off, as does threading the frame. The
`autoSizeAreaType` preference ("Auto Size New Area Type") gives new area type `autoHeight`.
- `shrinkText` (beyond the reference app), with `fitMinPercent` (10–100, default 50): when the text overflows,
every run's size, leading (explicit leading; auto leading follows the size) and baseline shift are scaled by the
largest factor down to `fitMinPercent` % that makes it fit. Paragraph spacing and indents stay. The stored
sizes don't change: the scaling happens at layout time, so rendering and every export see it. The factor is
found by bisection over the first run's size in steps of 0.1 pt (its scaled size is a whole number of tenths of
a point, so the result is deterministic); at `fitMinPercent` the text may still overflow.
The file stores `"fit": "autoHeight"` or `"fit": {"shrinkText": {"minPercent": 40}}` in the object's `area`; the
command also accepts that object form. The query (and every reply) of `text.areaOptions` reports `fit` as its id,
`fitMinPercent`, `overflow` (the text doesn't fit its frame) and `fitScale` (Shrink Text's factor, 1 unshrunk).
`document.inspect` (and `document.node {summary: true}`) reports `overflow` for area type and type on a path (text past
the end of the path), and `fit` and `fitScale` for area type.
```json
{"name":"run_command","arguments":{"command":"text.areaOptions","params":{"fit":"shrinkText","fitMinPercent":60}}}
```
## Converting between point type and area type
With the Selection tool, a single selected point or area type object shows the type widget: a small circle beside