import PDFDocument from "../PDFDocument";
import PDFPage from "../PDFPage";
import PDFFont from "../PDFFont";
import PDFImage from "../PDFImage";
import { ImageAlignment } from "../image/alignment";
import { AppearanceProviderFor } from "./appearances";
import PDFField, { FieldAppearanceOptions } from "./PDFField";
import { PDFRef, PDFAcroPushButton } from "../../core";
/**
 * Represents a button field of a [[PDFForm]].
 *
 * [[PDFButton]] fields are interactive controls that users can click with their
 * mouse. This type of [[PDFField]] is not stateful. The purpose of a button
 * is to perform an action when the user clicks on it, such as opening a print
 * modal or resetting the form. Buttons are typically rectangular in shape and
 * have a text label describing the action that they perform when clicked.
 */
export default class PDFButton extends PDFField {
    /**
     * > **NOTE:** You probably don't want to call this method directly. Instead,
     * > consider using the [[PDFForm.getButton]] method, which will create an
     * > instance of [[PDFButton]] for you.
     *
     * Create an instance of [[PDFButton]] from an existing acroPushButton and ref
     *
     * @param acroPushButton The underlying `PDFAcroPushButton` for this button.
     * @param ref The unique reference for this button.
     * @param doc The document to which this button will belong.
     */
    static of: (acroPushButton: PDFAcroPushButton, ref: PDFRef, doc: PDFDocument) => PDFButton;
    /** The low-level PDFAcroPushButton wrapped by this button. */
    readonly acroField: PDFAcroPushButton;
    private constructor();
    /**
     * Display an image inside the bounds of this button's widgets. For example:
     * ```js
     * const pngImage = await pdfDoc.embedPng(...)
     * const button = form.getButton('some.button.field')
     * button.setImage(pngImage, ImageAlignment.Center)
     * ```
     * This will update the appearances streams for each of this button's widgets.
     * @param image The image that should be displayed.
     * @param alignment The alignment of the image.
     */
    setImage(image: PDFImage, alignment?: ImageAlignment): void;
    /**
     * Set the font size for this field. Larger font sizes will result in larger
     * text being displayed when PDF readers render this button. Font sizes may
     * be integer or floating point numbers. Supplying a negative font size will
     * cause this method to throw an error.
     *
     * For example:
     * ```js
     * const button = form.getButton('some.button.field')
     * button.setFontSize(4)
     * button.setFontSize(15.7)
     * ```
     *
     * > This method depends upon the existence of a default appearance
     * > (`/DA`) string. If this field does not have a default appearance string,
     * > or that string does not contain a font size (via the `Tf` operator),
     * > then this method will throw an error.
     *
     * @param fontSize The font size to be used when rendering text in this field.
     */
    setFontSize(fontSize: number): void;
    /**
     * Show this button on the specified page with the given text. For example:
     * ```js
     * const ubuntuFont = await pdfDoc.embedFont(ubuntuFontBytes)
     * const page = pdfDoc.addPage()
     *
     * const form = pdfDoc.getForm()
     * const button = form.createButton('some.button.field')
     *
     * button.addToPage('Do Stuff', page, {
     *   x: 50,
     *   y: 75,
     *   width: 200,
     *   height: 100,
     *   textColor: rgb(1, 0, 0),
     *   backgroundColor: rgb(0, 1, 0),
     *   borderColor: rgb(0, 0, 1),
     *   borderWidth: 2,
     *   rotate: degrees(90),
     *   font: ubuntuFont,
     * })
     * ```
     * This will create a new widget for this button field.
     * @param text The text to be displayed for this button widget.
     * @param page The page to which this button widget should be added.
     * @param options The options to be used when adding this button widget.
     */
    addToPage(text: string, page: PDFPage, options?: FieldAppearanceOptions): void;
    /**
     * Returns `true` if this button has been marked as dirty, or if any of this
     * button's widgets do not have an appearance stream. For example:
     * ```js
     * const button = form.getButton('some.button.field')
     * if (button.needsAppearancesUpdate()) console.log('Needs update')
     * ```
     * @returns Whether or not this button needs an appearance update.
     */
    needsAppearancesUpdate(): boolean;
    /**
     * Update the appearance streams for each of this button's widgets using
     * the default appearance provider for buttons. For example:
     * ```js
     * const helvetica = await pdfDoc.embedFont(StandardFonts.Helvetica)
     * const button = form.getButton('some.button.field')
     * button.defaultUpdateAppearances(helvetica)
     * ```
     * @param font The font to be used for creating the appearance streams.
     */
    defaultUpdateAppearances(font: PDFFont): void;
    /**
     * Update the appearance streams for each of this button's widgets using
     * the given appearance provider. If no `provider` is passed, the default
     * appearance provider for buttons will be used. For example:
     * ```js
     * const helvetica = await pdfDoc.embedFont(StandardFonts.Helvetica)
     * const button = form.getButton('some.button.field')
     * button.updateAppearances(helvetica, (field, widget, font) => {
     *   ...
     *   return {
     *     normal: drawButton(...),
     *     down: drawButton(...),
     *   }
     * })
     * ```
     * @param font The font to be used for creating the appearance streams.
     * @param provider Optionally, the appearance provider to be used for
     *                 generating the contents of the appearance streams.
     */
    updateAppearances(font: PDFFont, provider?: AppearanceProviderFor<PDFButton>): void;
    private updateWidgetAppearance;
}
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