92 lines
2.1 KiB
JavaScript
92 lines
2.1 KiB
JavaScript
/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
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import { broker } from "../moto/broker.js";
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class History {
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#pos = -1;
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#stack = [];
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#tracking = false;
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constructor() {
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broker.subscribe({
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app_ready() {
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this.#tracking = true
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},
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drag_start(selected) {
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this.push('position', selected.map(model => ({
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model,
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pos: model.position().toArray()
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})));
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},
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drag_end(selected) {
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this.update(selected.map(model => ({
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model,
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pos: model.position().toArray()
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})));
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},
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move(data) {
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console.log('move', data);
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},
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rotate(data) {
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console.log('rotate', data);
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},
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scale(data) {
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console.log('scale', data);
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},
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}, this);
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}
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push(type, undo, redo) {
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this.#stack.length = ++this.#pos;
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this.#stack.push({
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type,
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undo,
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redo
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});
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}
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update(redo, undo) {
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let peek = this.#stack.peek();
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if (peek) {
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Object.assign(peek, {
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redo: redo || peek.redo,
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undo: undo || peek.undo
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});
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}
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}
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do(type, data) {
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switch (type) {
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case 'position':
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for (let { model, pos } of data) {
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model.position(...pos);
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}
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break;
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default:
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console.warn(`invalid record type: ${type}`);
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}
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}
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undo() {
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if (this.#pos >= 0) {
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const rec = this.#stack[this.#pos--];
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this.do(rec.type, rec.undo);
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}
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}
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redo() {
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if (this.#stack.length && this.#pos >= -1 && this.#pos < this.#stack.length - 1) {
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const rec = this.#stack[++this.#pos];
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this.do(rec.type, rec.redo);
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}
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}
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}
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export const history = new History();
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