mirror of
https://github.com/storytold/pdfcraft.git
synced 2026-10-14 19:27:04 -04:00
Zeyu LiandBrandon Thomas
b91d38c073
* M14: text the fonts can't draw is kept and reported, never written as ? silently Form values and captions, text boxes, callouts, Fill & Sign text, measurement labels and stamp by-lines keep text the standard fonts can't draw, draw ? for it, mark the annotation (PCUndrawn) and report the edit (interface notice, tools' warnings); forms set /NeedAppearances (not in PDF/A). Flattening, redaction overlay text, typed and visible signatures and create-from-text refuse instead. Reports escape such characters as [U+XXXX]. * Catalogs: the two new can't-draw messages in Czech, Slovene, Kazakh, Turkish and Greek; refresh hashes --------- Co-authored-by: Brandon Thomas <[email protected]>
66 lines
3.9 KiB
Markdown
66 lines
3.9 KiB
Markdown
# pdfcraft-forms
|
|
|
|
Interactive forms (AcroForm, ISO 32000-2 §12.7). Layer L3; depends on `pdfcraft-cos` and
|
|
`pdfcraft-fonts`.
|
|
|
|
## API
|
|
|
|
```rust
|
|
let all: Vec<Field> = fields(&doc); // terminal fields with widgets, options, flags, /DA
|
|
let snapshot = fields_with_adopted(&doc); // fields and page-only adoption count in one pass
|
|
let all = snapshot.items;
|
|
let adopted = snapshot.adopted_page_fields;
|
|
set_value(&mut doc, "name", &FieldValue::Text("Ada".into()))?;
|
|
set_value(&mut doc, "agree", &FieldValue::Check(true))?;
|
|
set_value(&mut doc, "size", &FieldValue::Radio(Some("L".into())))?;
|
|
set_value(&mut doc, "toppings", &FieldValue::Choice(vec!["Ham".into()]))?;
|
|
reset(&mut doc, None)?; // Clear form (back to /DV)
|
|
|
|
// Prepare a form
|
|
let name = add_field(&mut doc, 0, [72.0, 700.0, 216.0, 722.0], &NewField::Text { multiline: false }, None)?; // "Text1"
|
|
set_props(&mut doc, &name, &FieldProps { name: Some("email".into()), required: Some(true), ..Default::default() })?;
|
|
// A partial appearance edit keeps each widget's other styles and custom /DA font.
|
|
set_props(&mut doc, "email", &FieldProps {
|
|
appearance: Some(LookPatch { width: Some(3.0), fill: Some(None), ..Default::default() }),
|
|
..Default::default()
|
|
})?;
|
|
delete_field(&mut doc, "email")?;
|
|
```
|
|
|
|
## Behaviour
|
|
|
|
- Inheritable attributes (`/FT`, `/Ff`, `/V`, `/DV`, `/DA`, `/Q`, `/MaxLen`) are resolved down the
|
|
field tree; the form's `/DA` and `/Q` are the last fallback.
|
|
- Text and choice fields get new appearance streams (`/Tx BMC … EMC`): auto-size (`0 Tf`), comb,
|
|
multiline wrapping, password masking, quadding, `/MK` background and border, list-box selection.
|
|
The `/DA` font is used when `/DR` has it as a simple font or a composite font with a predefined
|
|
Unicode CMap; otherwise Helvetica (WinAnsi). A value or button caption the font can't hold
|
|
(Chinese in a Helvetica field, a character beyond U+FFFF in a UCS-2 CMap) is kept, as Acrobat
|
|
keeps it: `/V` is stored as typed, the appearance draws `?` for those characters, the widget is
|
|
marked with the first one (`pdfcraft_fonts::UNDRAWN_MARK`, cleared once all of it can be drawn)
|
|
and the form sets `/NeedAppearances`, so other viewers draw the field from its value with fonts
|
|
that have them. Not in a document that declares PDF/A, which forbids that flag (`declares_pdfa`).
|
|
`undrawn_fields` lists the marked fields; the engine reports each edit that draws one, and
|
|
flattening refuses to make that `?` permanent.
|
|
- Check boxes and radio buttons switch `/V` and each widget's `/AS`. Widgets with no appearances
|
|
get PdfCraft's own (a drawn check mark or dot; no symbol font needed).
|
|
- Values are validated (options, `MaxLen`, single vs multi-select, NoToggleToOff, read-only) and a
|
|
failed call changes nothing.
|
|
- `FieldProps::appearance` applies a `LookPatch` independently to each widget. `None` keeps
|
|
a property; `Some(None)` removes a border/fill colour. Unchanged `/DA`, custom font resources,
|
|
widget-specific `/DA` overrides, indirect `/MK` and `/BS` contents, dash arrays and unknown
|
|
dictionary keys are preserved. It is mutually exclusive with the complete `look` replacement.
|
|
Use the engine's `Edit::Batch` to change several fields atomically in one undo step.
|
|
- `/RV` (rich text) is removed when a value is set so it can't contradict `/V`.
|
|
- New fields follow Acrobat: names Text1, Check Box1, Group1 (radio groups), Dropdown1, List Box1,
|
|
Button1, Date1, Signature1; `/Helv` is added to `/DR`; appearances are drawn at once. Radio
|
|
buttons joining a group become kid widgets with their own export state. Renaming changes only
|
|
the last part of a dotted name.
|
|
|
|
## Not yet
|
|
|
|
Rich-text values and exact appearance metrics/layout remain incomplete. JavaScript
|
|
execution and FDF/XFDF exchange are integrated through the engine; this crate provides
|
|
field actions and native AF rules. `/MK /R` rotation (0, 90, 180, 270) is drawn into the
|
|
appearance.
|