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https://github.com/storytold/pdfcraft.git
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58 lines
3.2 KiB
Markdown
58 lines
3.2 KiB
Markdown
# pdfcraft-forms
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Interactive forms (AcroForm, ISO 32000-2 §12.7). Layer L3; depends on `pdfcraft-cos` and
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`pdfcraft-fonts`.
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## API
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```rust
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let all: Vec<Field> = fields(&doc); // terminal fields with widgets, options, flags, /DA
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let snapshot = fields_with_adopted(&doc); // fields and page-only adoption count in one pass
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let all = snapshot.items;
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let adopted = snapshot.adopted_page_fields;
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set_value(&mut doc, "name", &FieldValue::Text("Ada".into()))?;
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set_value(&mut doc, "agree", &FieldValue::Check(true))?;
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set_value(&mut doc, "size", &FieldValue::Radio(Some("L".into())))?;
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set_value(&mut doc, "toppings", &FieldValue::Choice(vec!["Ham".into()]))?;
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reset(&mut doc, None)?; // Clear form (back to /DV)
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// Prepare a form
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let name = add_field(&mut doc, 0, [72.0, 700.0, 216.0, 722.0], &NewField::Text { multiline: false }, None)?; // "Text1"
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set_props(&mut doc, &name, &FieldProps { name: Some("email".into()), required: Some(true), ..Default::default() })?;
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// A partial appearance edit keeps each widget's other styles and custom /DA font.
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set_props(&mut doc, "email", &FieldProps {
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appearance: Some(LookPatch { width: Some(3.0), fill: Some(None), ..Default::default() }),
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..Default::default()
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})?;
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delete_field(&mut doc, "email")?;
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```
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## Behaviour
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- Inheritable attributes (`/FT`, `/Ff`, `/V`, `/DV`, `/DA`, `/Q`, `/MaxLen`) are resolved down the
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field tree; the form's `/DA` and `/Q` are the last fallback.
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- Text and choice fields get new appearance streams (`/Tx BMC … EMC`): auto-size (`0 Tf`), comb,
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multiline wrapping, password masking, quadding, `/MK` background and border, list-box selection.
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The `/DA` font is used when `/DR` has it as a simple font; otherwise Helvetica (WinAnsi).
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- Check boxes and radio buttons switch `/V` and each widget's `/AS`. Widgets with no appearances
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get PdfCraft's own (a drawn check mark or dot; no symbol font needed).
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- Values are validated (options, `MaxLen`, single vs multi-select, NoToggleToOff, read-only) and a
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failed call changes nothing.
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- `FieldProps::appearance` applies a `LookPatch` independently to each widget. `None` keeps
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a property; `Some(None)` removes a border/fill colour. Unchanged `/DA`, custom font resources,
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widget-specific `/DA` overrides, indirect `/MK` and `/BS` contents, dash arrays and unknown
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dictionary keys are preserved. It is mutually exclusive with the complete `look` replacement.
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Use the engine's `Edit::Batch` to change several fields atomically in one undo step.
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- `/RV` (rich text) is removed when a value is set so it can't contradict `/V`.
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- New fields follow Acrobat: names Text1, Check Box1, Group1 (radio groups), Dropdown1, List Box1,
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Button1, Date1, Signature1; `/Helv` is added to `/DR`; appearances are drawn at once. Radio
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buttons joining a group become kid widgets with their own export state. Renaming changes only
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the last part of a dotted name.
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## Not yet
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Rich-text values and exact appearance metrics/layout remain incomplete. JavaScript
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execution and FDF/XFDF exchange are integrated through the engine; this crate provides
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field actions and native AF rules. `/MK /R` rotation (0, 90, 180, 270) is drawn into the
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appearance.
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