pdf-lib
Version:
Create and modify PDF files with JavaScript
205 lines (204 loc) • 8.23 kB
TypeScript
import PDFDocument from "../PDFDocument";
import PDFFont from "../PDFFont";
import { AppearanceMapping } from "./appearances";
import { Color } from "../colors";
import { Rotation } from "../rotations";
import { PDFRef, PDFWidgetAnnotation, PDFOperator, PDFName, PDFDict, PDFAcroTerminal } from "../../core";
import { ImageAlignment } from '../image';
import PDFImage from '../PDFImage';
export interface FieldAppearanceOptions {
x?: number;
y?: number;
width?: number;
height?: number;
textColor?: Color;
backgroundColor?: Color;
borderColor?: Color;
borderWidth?: number;
rotate?: Rotation;
font?: PDFFont;
hidden?: boolean;
}
export declare const assertFieldAppearanceOptions: (options?: FieldAppearanceOptions | undefined) => void;
/**
* Represents a field of a [[PDFForm]].
*
* This class is effectively abstract. All fields in a [[PDFForm]] will
* actually be an instance of a subclass of this class.
*
* Note that each field in a PDF is represented by a single field object.
* However, a given field object may be rendered at multiple locations within
* the document (across one or more pages). The rendering of a field is
* controlled by its widgets. Each widget causes its field to be displayed at a
* particular location in the document.
*
* Most of the time each field in a PDF has only a single widget, and thus is
* only rendered once. However, if a field is rendered multiple times, it will
* have multiple widgets - one for each location it is rendered.
*
* This abstraction of field objects and widgets is defined in the PDF
* specification and dictates how PDF files store fields and where they are
* to be rendered.
*/
export default class PDFField {
/** The low-level PDFAcroTerminal wrapped by this field. */
readonly acroField: PDFAcroTerminal;
/** The unique reference assigned to this field within the document. */
readonly ref: PDFRef;
/** The document to which this field belongs. */
readonly doc: PDFDocument;
protected constructor(acroField: PDFAcroTerminal, ref: PDFRef, doc: PDFDocument);
/**
* Get the fully qualified name of this field. For example:
* ```js
* const fields = form.getFields()
* fields.forEach(field => {
* const name = field.getName()
* console.log('Field name:', name)
* })
* ```
* Note that PDF fields are structured as a tree. Each field is the
* descendent of a series of ancestor nodes all the way up to the form node,
* which is always the root of the tree. Each node in the tree (except for
* the form node) has a partial name. Partial names can be composed of any
* unicode characters except a period (`.`). The fully qualified name of a
* field is composed of the partial names of all its ancestors joined
* with periods. This means that splitting the fully qualified name on
* periods and taking the last element of the resulting array will give you
* the partial name of a specific field.
* @returns The fully qualified name of this field.
*/
getName(): string;
/**
* Returns `true` if this field is read only. This means that PDF readers
* will not allow users to interact with the field or change its value. See
* [[PDFField.enableReadOnly]] and [[PDFField.disableReadOnly]].
* For example:
* ```js
* const field = form.getField('some.field')
* if (field.isReadOnly()) console.log('Read only is enabled')
* ```
* @returns Whether or not this is a read only field.
*/
isReadOnly(): boolean;
/**
* Prevent PDF readers from allowing users to interact with this field or
* change its value. The field will not respond to mouse or keyboard input.
* For example:
* ```js
* const field = form.getField('some.field')
* field.enableReadOnly()
* ```
* Useful for fields whose values are computed, imported from a database, or
* prefilled by software before being displayed to the user.
*/
enableReadOnly(): void;
/**
* Allow users to interact with this field and change its value in PDF
* readers via mouse and keyboard input. For example:
* ```js
* const field = form.getField('some.field')
* field.disableReadOnly()
* ```
*/
disableReadOnly(): void;
/**
* Returns `true` if this field must have a value when the form is submitted.
* See [[PDFField.enableRequired]] and [[PDFField.disableRequired]].
* For example:
* ```js
* const field = form.getField('some.field')
* if (field.isRequired()) console.log('Field is required')
* ```
* @returns Whether or not this field is required.
*/
isRequired(): boolean;
/**
* Require this field to have a value when the form is submitted.
* For example:
* ```js
* const field = form.getField('some.field')
* field.enableRequired()
* ```
*/
enableRequired(): void;
/**
* Do not require this field to have a value when the form is submitted.
* For example:
* ```js
* const field = form.getField('some.field')
* field.disableRequired()
* ```
*/
disableRequired(): void;
/**
* Returns `true` if this field's value should be exported when the form is
* submitted. See [[PDFField.enableExporting]] and
* [[PDFField.disableExporting]].
* For example:
* ```js
* const field = form.getField('some.field')
* if (field.isExported()) console.log('Exporting is enabled')
* ```
* @returns Whether or not this field's value should be exported.
*/
isExported(): boolean;
/**
* Indicate that this field's value should be exported when the form is
* submitted in a PDF reader. For example:
* ```js
* const field = form.getField('some.field')
* field.enableExporting()
* ```
*/
enableExporting(): void;
/**
* Indicate that this field's value should **not** be exported when the form
* is submitted in a PDF reader. For example:
* ```js
* const field = form.getField('some.field')
* field.disableExporting()
* ```
*/
disableExporting(): void;
/** @ignore */
needsAppearancesUpdate(): boolean;
/** @ignore */
defaultUpdateAppearances(_font: PDFFont): void;
protected markAsDirty(): void;
protected markAsClean(): void;
protected isDirty(): boolean;
protected createWidget(options: {
x: number;
y: number;
width: number;
height: number;
textColor?: Color;
backgroundColor?: Color;
borderColor?: Color;
borderWidth: number;
rotate: Rotation;
caption?: string;
hidden?: boolean;
page?: PDFRef;
}): PDFWidgetAnnotation;
protected updateWidgetAppearanceWithFont(widget: PDFWidgetAnnotation, font: PDFFont, { normal, rollover, down }: AppearanceMapping<PDFOperator[]>): void;
protected updateOnOffWidgetAppearance(widget: PDFWidgetAnnotation, onValue: PDFName, { normal, rollover, down, }: AppearanceMapping<{
on: PDFOperator[];
off: PDFOperator[];
}>): void;
protected updateWidgetAppearances(widget: PDFWidgetAnnotation, { normal, rollover, down }: AppearanceMapping<PDFRef | PDFDict>): void;
private createAppearanceStream;
/**
* Create a FormXObject of the supplied image and add it to context.
* The FormXObject size is calculated based on the widget (including
* the alignment).
* @param widget The widget that should display the image.
* @param alignment The alignment of the image.
* @param image The image that should be displayed.
* @returns The ref for the FormXObject that was added to the context.
*/
protected createImageAppearanceStream(widget: PDFWidgetAnnotation, image: PDFImage, alignment: ImageAlignment): PDFRef;
private createAppearanceDict;
}
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