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block-tune-move-down.ts
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block-tune-move-down.ts
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/**
* @class MoveDownTune
* @classdesc Editor's default tune - Moves down highlighted block
*
* @copyright <CodeX Team> 2018
*/
import $ from '../dom';
import { API, BlockTune, PopoverItem } from '../../../types';
import Popover from '../utils/popover';
/**
*
*/
export default class MoveDownTune implements BlockTune {
/**
* Set Tool is Tune
*/
public static readonly isTune = true;
/**
* Property that contains Editor.js API methods
*
* @see {@link docs/api.md}
*/
private readonly api: API;
/**
* Styles
*/
private CSS = {
animation: 'wobble',
};
/**
* MoveDownTune constructor
*
* @param {API} api — Editor's API
*/
constructor({ api }) {
this.api = api;
}
/**
* Tune's appearance in block settings menu
*/
public render(): PopoverItem {
return {
icon: $.svg('arrow-down', 14, 14).outerHTML,
label: this.api.i18n.t('Move down'),
onActivate: (item, event): void => this.handleClick(event),
name: 'move-down',
};
}
/**
* Handle clicks on 'move down' button
*
* @param event - click event
*/
public handleClick(event: MouseEvent): void {
const currentBlockIndex = this.api.blocks.getCurrentBlockIndex();
const nextBlock = this.api.blocks.getBlockByIndex(currentBlockIndex + 1);
// If Block is last do nothing
if (!nextBlock) {
const button = (event.target as HTMLElement)
.closest('.' + Popover.CSS.item)
.querySelector('.' + Popover.CSS.itemIcon);
button.classList.add(this.CSS.animation);
window.setTimeout(() => {
button.classList.remove(this.CSS.animation);
}, 500);
return;
}
const nextBlockElement = nextBlock.holder;
const nextBlockCoords = nextBlockElement.getBoundingClientRect();
let scrollOffset = Math.abs(window.innerHeight - nextBlockElement.offsetHeight);
/**
* Next block ends on screen.
* Increment scroll by next block's height to save element onscreen-position
*/
if (nextBlockCoords.top < window.innerHeight) {
scrollOffset = window.scrollY + nextBlockElement.offsetHeight;
}
window.scrollTo(0, scrollOffset);
/** Change blocks positions */
this.api.blocks.move(currentBlockIndex + 1);
this.api.toolbar.toggleBlockSettings(true);
}
}