2019-09-09 12:03:18 +02:00
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import Dom from './dom';
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2020-06-03 10:17:29 +02:00
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import * as _ from './utils';
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import SelectionUtils from './selection';
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2019-09-09 12:03:18 +02:00
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/**
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* Iterator above passed Elements list.
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* Each next or previous action adds provides CSS-class and sets cursor to this item
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*/
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export default class DomIterator {
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/**
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* This is a static property that defines iteration directions
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2020-06-03 10:17:29 +02:00
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*
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2019-09-09 12:03:18 +02:00
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* @type {{RIGHT: string, LEFT: string}}
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*/
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public static directions = {
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RIGHT: 'right',
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LEFT: 'left',
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};
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/**
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* User-provided CSS-class name for focused button
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*/
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private focusedCssClass: string;
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/**
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* Focused button index.
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* Default is -1 which means nothing is active
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2020-06-03 10:17:29 +02:00
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*
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2019-09-09 12:03:18 +02:00
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* @type {number}
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*/
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2020-06-03 10:17:29 +02:00
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private cursor = -1;
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2019-09-09 12:03:18 +02:00
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/**
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* Items to flip
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*/
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private items: HTMLElement[] = [];
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/**
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* @param {HTMLElement[]} nodeList — the list of iterable HTML-items
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* @param {string} focusedCssClass - user-provided CSS-class that will be set in flipping process
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*/
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constructor(
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nodeList: HTMLElement[],
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2020-06-03 10:17:29 +02:00
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focusedCssClass: string
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2019-09-09 12:03:18 +02:00
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) {
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this.items = nodeList || [];
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this.focusedCssClass = focusedCssClass;
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}
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/**
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* Returns Focused button Node
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2020-06-03 10:17:29 +02:00
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*
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* @returns {HTMLElement}
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2019-09-09 12:03:18 +02:00
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*/
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public get currentItem(): HTMLElement {
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if (this.cursor === -1) {
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return null;
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}
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return this.items[this.cursor];
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}
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/**
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* Sets items. Can be used when iterable items changed dynamically
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2020-06-03 10:17:29 +02:00
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*
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* @param {HTMLElement[]} nodeList - nodes to iterate
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2019-09-09 12:03:18 +02:00
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*/
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public setItems(nodeList: HTMLElement[]): void {
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this.items = nodeList;
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}
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/**
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* Sets cursor next to the current
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*/
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public next(): void {
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this.cursor = this.leafNodesAndReturnIndex(DomIterator.directions.RIGHT);
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}
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/**
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* Sets cursor before current
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*/
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public previous(): void {
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this.cursor = this.leafNodesAndReturnIndex(DomIterator.directions.LEFT);
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}
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/**
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* Sets cursor to the default position and removes CSS-class from previously focused item
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*/
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public dropCursor(): void {
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if (this.cursor === -1) {
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return;
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}
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this.items[this.cursor].classList.remove(this.focusedCssClass);
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this.cursor = -1;
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}
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/**
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* Leafs nodes inside the target list from active element
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*
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* @param {string} direction - leaf direction. Can be 'left' or 'right'
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2020-06-03 10:17:29 +02:00
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* @returns {number} index of focused node
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2019-09-09 12:03:18 +02:00
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*/
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private leafNodesAndReturnIndex(direction: string): number {
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2019-11-30 21:42:39 +01:00
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/**
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* if items are empty then there is nothing to leaf
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*/
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if (this.items.length === 0) {
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return this.cursor;
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}
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2019-09-09 12:03:18 +02:00
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let focusedButtonIndex = this.cursor;
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/**
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* If activeButtonIndex === -1 then we have no chosen Tool in Toolbox
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*/
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if (focusedButtonIndex === -1) {
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/**
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* Normalize "previous" Tool index depending on direction.
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* We need to do this to highlight "first" Tool correctly
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*
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* Order of Tools: [0] [1] ... [n - 1]
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* [0 = n] because of: n % n = 0 % n
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*
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* Direction 'right': for [0] the [n - 1] is a previous index
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* [n - 1] -> [0]
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*
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* Direction 'left': for [n - 1] the [0] is a previous index
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* [n - 1] <- [0]
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*
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* @type {number}
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*/
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focusedButtonIndex = direction === DomIterator.directions.RIGHT ? -1 : 0;
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} else {
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/**
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* If we have chosen Tool then remove highlighting
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*/
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this.items[focusedButtonIndex].classList.remove(this.focusedCssClass);
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}
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/**
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* Count index for next Tool
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*/
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if (direction === DomIterator.directions.RIGHT) {
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/**
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* If we go right then choose next (+1) Tool
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2020-06-03 10:17:29 +02:00
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*
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2019-09-09 12:03:18 +02:00
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* @type {number}
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*/
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focusedButtonIndex = (focusedButtonIndex + 1) % this.items.length;
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} else {
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/**
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* If we go left then choose previous (-1) Tool
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* Before counting module we need to add length before because of "The JavaScript Modulo Bug"
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2020-06-03 10:17:29 +02:00
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*
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2019-09-09 12:03:18 +02:00
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* @type {number}
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*/
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focusedButtonIndex = (this.items.length + focusedButtonIndex - 1) % this.items.length;
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}
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2020-06-03 10:17:29 +02:00
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if (Dom.canSetCaret(this.items[focusedButtonIndex])) {
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2019-09-09 12:03:18 +02:00
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/**
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2020-06-03 10:17:29 +02:00
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* Focus input with micro-delay to ensure DOM is updated
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2019-09-09 12:03:18 +02:00
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*/
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2020-06-03 10:17:29 +02:00
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_.delay(() => SelectionUtils.setCursor(this.items[focusedButtonIndex]), 50)();
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2019-09-09 12:03:18 +02:00
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}
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/**
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* Highlight new chosen Tool
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*/
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this.items[focusedButtonIndex].classList.add(this.focusedCssClass);
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/**
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* Return focused button's index
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*/
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return focusedButtonIndex;
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}
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}
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