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| class Spinner { | |
| static #count = 0; | |
| static #svgWrapperTemplate({ className, id, children }) { | |
| return ` | |
| <svg id="${id}" class="${className}" viewBox="0 0 100 100" preserveAspectRatio="xMidYMid"> | |
| ${children} | |
| </svg> | |
| `; | |
| } | |
| static #poleTemplate({ beginTime, fillColor, inclination }) { | |
| return ` | |
| <g transform="rotate(${inclination} 50 50)"> | |
| <rect x="47.5" y="28" rx="0" ry="0" width="5" height="12" fill="${fillColor}"> | |
| <animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="${beginTime}" repeatCount="indefinite"/> | |
| </rect> | |
| </g> | |
| `; | |
| } | |
| static get #colorBlue() { | |
| return '#046DD5'; | |
| } | |
| static get #colorRed() { | |
| return '#D50407'; | |
| } | |
| #id = ""; | |
| #parent = null; | |
| #element = null; | |
| #template = null; | |
| #frozen = false; | |
| constructor({ | |
| className = "spinner", | |
| fillColor = Spinner.#colorBlue, | |
| parent = document.body, | |
| polesCount = 8, | |
| } = {}) { | |
| this.#parent = parent; | |
| this.#element = null; | |
| this.#id = `spinner-${Spinner.#count++}`; | |
| const inclinationUnit = 360 / polesCount; | |
| const beginTimeUnit = 1 / polesCount; | |
| let lastInclination = inclinationUnit; | |
| let lastBeginTime = beginTimeUnit; | |
| let children = ''; | |
| for (let i = 0; i < polesCount; i++) { | |
| children += Spinner.#poleTemplate({ | |
| beginTime: `${lastBeginTime - 1}s`, | |
| fillColor, | |
| inclination: lastInclination, | |
| }); | |
| lastInclination += inclinationUnit; | |
| lastBeginTime += beginTimeUnit; | |
| } | |
| this.#template = Spinner.#svgWrapperTemplate({ | |
| className, | |
| id: this.#id, | |
| children, | |
| }); | |
| } | |
| get element() { | |
| return this.#element; | |
| } | |
| mount() { | |
| if (!this.#element) { | |
| this.#parent.insertAdjacentHTML('beforeend', this.#template); | |
| this.#element = this.#parent.querySelector(`#${this.#id}`); | |
| } | |
| } | |
| unmount() { | |
| if (this.element) { | |
| this.element.remove(); | |
| this.#element = null; | |
| } | |
| } | |
| #setSVGAnimationRepeatCountAttribute(value) { | |
| Array | |
| .from(document.querySelectorAll(`#${this.#id} animate`)) | |
| .forEach(element => element.setAttribute('repeatCount', value)); | |
| } | |
| freeze() { | |
| let opSucceed = false | |
| if (!this.isFrozen) { | |
| this.#setSVGAnimationRepeatCountAttribute('0'); | |
| this.#frozen = true; | |
| opSucceed = true; | |
| } | |
| return opSucceed | |
| } | |
| get isFrozen() { | |
| return !!this.element && this.#frozen; | |
| } | |
| resume() { | |
| let opSucceed = false | |
| if (this.isFrozen) { | |
| this.#setSVGAnimationRepeatCountAttribute('indefinite'); | |
| this.#frozen = false; | |
| opSucceed = true; | |
| } | |
| return opSucceed | |
| } | |
| } |
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