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M6: auto-size text fields shrink and wrap typed text on screen, as on the page (#1964)

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Auto-size fields (`0 Tf`, often inherited from the AcroForm /DA) fit their
value to the box in the page appearance, but the in-place editor and the
preview shown before the page re-renders ignored it: they used a fixed guess
from the box height, never shrank to the width and never wrapped multiline
text, so long values ran past the box and were clipped.

The fit now lives in one place, `appearance::auto_text_size_by` (re-exported
as `field_auto_text_size_by`). The page appearance measures with Helvetica;
the screen measures with the interface font it draws in, which is wider and
breaks lines differently, so the text stays inside the box on screen too. The
editor wraps at the same scaled width the size was fitted to. Explicit sizes
are unchanged and still clip, as in Acrobat.

Tests: forms auto_text_size_fits_single_and_multiline_text (incl. NaN/inf/
negative boxes and a NaN measurer); ui-egui
auto_size_fields_shrink_and_wrap_typed_text_to_fit_their_box (fails with the
old on-screen sizing restored).

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Shawn Skaggs
2026-10-15 02:33:45 -04:00
committed by GitHub
co-authored by Claude Opus 5.5
parent 03f232be5a
commit 57256f9a4c
6 changed files with 176 additions and 28 deletions
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parity/acrobat-features.toml
+3 -3
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@@ -4404,8 +4404,8 @@ milestone = "M6"
status = "shipped"
commands = ["form.fields"]
tools = ["form_fill", "form_fields"]
evidence = ["crates/ui-egui/tests/forms.rs::typing_into_a_text_field_and_tabbing_on", "crates/forms/src/tests.rs::text_fields_get_new_appearances", "crates/engine/src/tests.rs::filling_a_form_shows_saves_and_undoes", "crates/automation/tests/automation.rs::orphan_form_fields_through_tools"]
notes = "in-place editor; Enter or clicking away commits, Escape cancels; no format/keystroke JavaScript yet (M6.4)"
evidence = ["crates/ui-egui/tests/forms.rs::typing_into_a_text_field_and_tabbing_on", "crates/ui-egui/tests/forms.rs::auto_size_fields_shrink_and_wrap_typed_text_to_fit_their_box", "crates/forms/src/tests.rs::text_fields_get_new_appearances", "crates/engine/src/tests.rs::filling_a_form_shows_saves_and_undoes", "crates/automation/tests/automation.rs::orphan_form_fields_through_tools"]
notes = "in-place editor; Enter or clicking away commits, Escape cancels; auto-size (0 Tf) fields shrink, and multiline ones wrap, the text being typed to fit the box, on screen as on the page (the screen measures in the interface font, so its size can be a little smaller than the page's Helvetica fit); fixed sizes are kept and clip, as in Acrobat; no format/keystroke JavaScript yet (M6.4)"
[[feature]]
id = "form.fill-checkbox-radio"
@@ -4464,7 +4464,7 @@ milestone = "M6"
status = "partial"
commands = ["form.fields"]
tools = ["form_fill", "form_set_props"]
evidence = ["crates/forms/src/tests.rs::text_fields_get_new_appearances", "crates/forms/src/tests.rs::choices_accept_exports_or_display_text", "crates/forms/src/tests.rs::rotated_fields_draw_in_their_quadrant", "crates/engine/tests/form_rotation.rs::a_rotated_field_draws_along_the_vertical_edge", "crates/automation/tests/automation.rs::rotating_a_field_through_tools", "crates/ui-egui/tests/prepare.rs::position_tab_rotates_a_field"]
evidence = ["crates/forms/src/tests.rs::text_fields_get_new_appearances", "crates/forms/src/tests.rs::auto_text_size_fits_single_and_multiline_text", "crates/forms/src/tests.rs::choices_accept_exports_or_display_text", "crates/forms/src/tests.rs::rotated_fields_draw_in_their_quadrant", "crates/engine/tests/form_rotation.rs::a_rotated_field_draws_along_the_vertical_edge", "crates/automation/tests/automation.rs::rotating_a_field_through_tools", "crates/ui-egui/tests/prepare.rs::position_tab_rotates_a_field"]
notes = "auto-size, comb, multiline, password, quadding, /MK colours and /MK /R rotation (0, 90, 180, 270); approximate Helvetica metrics"
[[feature]]