@deathbeds/jupyterlab-fonts/lib/button.js

import { DisposableDelegate } from '@lumino/disposable';
import { Signal } from '@lumino/signaling';
import { ToolbarButton } from '@jupyterlab/apputils';
import { PACKAGE_NAME, CONFIGURED_CLASS } from '.';
import { ICONS } from './icons';
/**
 * A notebook widget extension that adds a button to the toolbar.
 */
export class NotebookFontsButton {
    constructor() {
        this.widgetRequested = new Signal(this);
    }
    /**
     * Create a new extension object.
     */
    createNew(panel, context) {
        let button = new ToolbarButton({
            icon: ICONS.fonts,
            onClick: () => {
                this.widgetRequested.emit(void 0);
            },
            tooltip: 'Customize Notebook Fonts'
        });
        const metaUpdated = (metadata) => {
            const hasMeta = !!metadata.get(PACKAGE_NAME);
            if (hasMeta) {
                button.addClass(CONFIGURED_CLASS);
            }
            else {
                button.removeClass(CONFIGURED_CLASS);
            }
        };
        if (panel.model) {
            panel.model.metadata.changed.connect(metaUpdated);
            metaUpdated(panel.model.metadata);
        }
        panel.toolbar.insertItem(9, 'fonts', button);
        return new DisposableDelegate(() => {
            button.dispose();
        });
    }
}
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