@jupyterlab/notebook/lib/notebookfooter.js

/*
 * Copyright (c) Jupyter Development Team.
 * Distributed under the terms of the Modified BSD License.
 */
import { Widget } from '@lumino/widgets';
import { NotebookActions } from './actions';
const NOTEBOOK_FOOTER_CLASS = 'jp-Notebook-footer';
/**
 * A footer widget added after the last cell of the notebook.
 */
export class NotebookFooter extends Widget {
    /**
     * Construct a footer widget.
     */
    constructor(notebook) {
        super({ node: document.createElement('button') });
        this.notebook = notebook;
        const trans = notebook.translator.load('jupyterlab');
        this.addClass(NOTEBOOK_FOOTER_CLASS);
        this.node.innerText = trans.__('Click to add a cell.');
    }
    /**
     * Handle incoming events.
     */
    handleEvent(event) {
        switch (event.type) {
            case 'click':
                this.onClick();
                break;
            case 'keydown':
                if (event.key === 'ArrowUp') {
                    this.onArrowUp();
                    break;
                }
        }
    }
    /**
     * On single click (mouse event), insert a cell below (at the end of the notebook as default behavior).
     */
    onClick() {
        if (this.notebook.widgets.length > 0) {
            this.notebook.activeCellIndex = this.notebook.widgets.length - 1;
        }
        NotebookActions.insertBelow(this.notebook);
    }
    /**
     * On arrow up key pressed (keydown keyboard event), blur the footer and switch to command mode.
     */
    onArrowUp() {
        this.node.blur();
        this.notebook.mode = 'command';
    }
    /*
     * Handle `after-detach` messages for the widget.
     */
    onAfterAttach(msg) {
        super.onAfterAttach(msg);
        this.node.addEventListener('click', this);
        this.node.addEventListener('keydown', this);
    }
    /**
     * Handle `before-detach` messages for the widget.
     */
    onBeforeDetach(msg) {
        this.node.removeEventListener('click', this);
        this.node.removeEventListener('keydown', this);
        super.onBeforeDetach(msg);
    }
}
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