vanilla-tilt.js/lib/vanilla-tilt.es2015.js

/**
 * Created by Șandor Sergiu (micku7zu) on 1/27/2017.
 * Original idea: https://github.com/gijsroge/tilt.js
 * MIT License.
 * Version 1.4.1
 */

class VanillaTilt {
  constructor(element, settings = {}) {
    if (!(element instanceof Node)) {
      throw ("Can't initialize VanillaTilt because " + element + " is not a Node.");
    }

    this.width = null;
    this.height = null;
    this.left = null;
    this.top = null;
    this.transitionTimeout = null;
    this.updateCall = null;

    this.updateBind = this.update.bind(this);
    this.resetBind = this.reset.bind(this);

    this.element = element;
    this.settings = this.extendSettings(settings);
    this.elementListener = this.getElementListener();

    this.reverse = this.settings.reverse ? -1 : 1;

    this.glare = this.isSettingTrue(this.settings.glare);
    this.glarePrerender = this.isSettingTrue(this.settings['glare-prerender']);

    if (this.glare) {
      this.prepareGlare();
    }

    this.addEventListeners();
  }

  isSettingTrue(setting) {
    return setting === "" || setting === true || setting === 1;
  }

  /**
   * Method returns element what will be listen mouse events
   * @return {Node}
   */
  getElementListener() {
    if (!this.settings || !this.settings.mouseEventElement) { return this.element; }

    if (typeof this.settings.mouseEventElement === 'string') {
      const mouseEventElement = document.querySelector(this.settings.mouseEventElement);

      if (mouseEventElement) {
        return mouseEventElement;
      }
    }

    if (this.settings.mouseEventElement instanceof Node && this.settings.mouseEventElement) {
      return this.settings.mouseEventElement;
    }
  }

  /**
   * Method set listen methods for this.elementListener
   * @return {Node}
   */
  addEventListeners() {
    this.onMouseEnterBind = this.onMouseEnter.bind(this);
    this.onMouseMoveBind = this.onMouseMove.bind(this);
    this.onMouseLeaveBind = this.onMouseLeave.bind(this);
    this.onWindowResizeBind = this.onWindowResizeBind.bind(this);

    this.elementListener.addEventListener('mouseenter', this.onMouseEnterBind);
    this.elementListener.addEventListener('mousemove', this.onMouseMoveBind);
    this.elementListener.addEventListener('mouseleave', this.onMouseLeaveBind);

    if (this.glare) {
      window.addEventListener('resize', this.onWindowResizeBind);
    }
  }

  /**
   * Method remove event listeners from current this.elementListener
   */
  removeEventListeners() {
    this.elementListener.removeEventListener('mouseenter', this.onMouseEnterBind);
    this.elementListener.removeEventListener('mousemove', this.onMouseMoveBind);
    this.elementListener.removeEventListener('mouseleave', this.onMouseLeaveBind);

    if (this.glare) {
      window.removeEventListener('resize', this.onWindowResizeBind);
    }
  }

  destroy() {
    clearTimeout(this.transitionTimeout);
    if (this.updateCall !== null) {
      cancelAnimationFrame(this.updateCall);
    }

    this.reset();

    this.removeEventListeners();
    this.element.vanillaTilt = null;
    delete this.element.vanillaTilt;

    this.element = null;
  }

  onMouseEnter() {
    this.updateElementPosition();
    this.element.style.willChange = 'transform';
    this.setTransition();
  }

  onMouseMove(event) {
    if (this.updateCall !== null) {
      cancelAnimationFrame(this.updateCall);
    }

    this.event = event;
    this.updateCall = requestAnimationFrame(this.updateBind);
  }

  onMouseLeave() {
    this.setTransition();

    if (this.settings.reset) {
      requestAnimationFrame(this.resetBind);
    }
  }

  reset() {
    this.event = {
      pageX: this.left + this.width / 2,
      pageY: this.top + this.height / 2
    };

    if (this.element && this.element.style) {
      this.element.style.transform = `perspective(${this.settings.perspective}px) ` +
        `rotateX(0deg) ` +
        `rotateY(0deg) ` +
        `scale3d(1, 1, 1)`;
    }

    if (this.glare) {
      this.glareElement.style.transform = 'rotate(180deg) translate(-50%, -50%)';
      this.glareElement.style.opacity = '0';
    }
  }

  getValues() {
    let x = (this.event.clientX - this.left) / this.width;
    let y = (this.event.clientY - this.top) / this.height;

    x = Math.min(Math.max(x, 0), 1);
    y = Math.min(Math.max(y, 0), 1);

    let tiltX = (this.reverse * (this.settings.max / 2 - x * this.settings.max)).toFixed(2);
    let tiltY = (this.reverse * (y * this.settings.max - this.settings.max / 2)).toFixed(2);
    let angle = Math.atan2(this.event.clientX - (this.left + this.width / 2), -(this.event.clientY - (this.top + this.height / 2))) * (180 / Math.PI);

    return {
      tiltX: tiltX,
      tiltY: tiltY,
      percentageX: x * 100,
      percentageY: y * 100,
      angle: angle
    };
  }

  updateElementPosition() {
    let rect = this.element.getBoundingClientRect();

    this.width = this.element.offsetWidth;
    this.height = this.element.offsetHeight;
    this.left = rect.left;
    this.top = rect.top;
  }

  update() {
    let values = this.getValues();

    this.element.style.transform = "perspective(" + this.settings.perspective + "px) " +
      "rotateX(" + (this.settings.axis === "x" ? 0 : values.tiltY) + "deg) " +
      "rotateY(" + (this.settings.axis === "y" ? 0 : values.tiltX) + "deg) " +
      "scale3d(" + this.settings.scale + ", " + this.settings.scale + ", " + this.settings.scale + ")";

    if (this.glare) {
      this.glareElement.style.transform = `rotate(${values.angle}deg) translate(-50%, -50%)`;
      this.glareElement.style.opacity = `${values.percentageY * this.settings["max-glare"] / 100}`;
    }

    this.element.dispatchEvent(new CustomEvent("tiltChange", {
      "detail": values
    }));

    this.updateCall = null;
  }

  /**
   * Appends the glare element (if glarePrerender equals false)
   * and sets the default style
   */
  prepareGlare() {
    // If option pre-render is enabled we assume all html/css is present for an optimal glare effect.
    if (!this.glarePrerender) {
      // Create glare element
      const jsTiltGlare = document.createElement("div");
      jsTiltGlare.classList.add("js-tilt-glare");

      const jsTiltGlareInner = document.createElement("div");
      jsTiltGlareInner.classList.add("js-tilt-glare-inner");

      jsTiltGlare.appendChild(jsTiltGlareInner);
      this.element.appendChild(jsTiltGlare);
    }

    this.glareElementWrapper = this.element.querySelector(".js-tilt-glare");
    this.glareElement = this.element.querySelector(".js-tilt-glare-inner");

    if (this.glarePrerender) {
      return;
    }

    Object.assign(this.glareElementWrapper.style, {
      "position": "absolute",
      "top": "0",
      "left": "0",
      "width": "100%",
      "height": "100%",
      "overflow": "hidden"
    });

    Object.assign(this.glareElement.style, {
      'position': 'absolute',
      'top': '50%',
      'left': '50%',
      'pointer-events': 'none',
      'background-image': `linear-gradient(0deg, rgba(255,255,255,0) 0%, rgba(255,255,255,1) 100%)`,
      'width': `${this.element.offsetWidth * 2}px`,
      'height': `${this.element.offsetWidth * 2}px`,
      'transform': 'rotate(180deg) translate(-50%, -50%)',
      'transform-origin': '0% 0%',
      'opacity': '0',
    });
  }

  updateGlareSize() {
    Object.assign(this.glareElement.style, {
      'width': `${this.element.offsetWidth * 2}`,
      'height': `${this.element.offsetWidth * 2}`,
    });
  }

  onWindowResizeBind() {
    this.updateGlareSize();
  }

  setTransition() {
    clearTimeout(this.transitionTimeout);
    this.element.style.transition = this.settings.speed + "ms " + this.settings.easing;
    if (this.glare) this.glareElement.style.transition = `opacity ${this.settings.speed}ms ${this.settings.easing}`;

    this.transitionTimeout = setTimeout(() => {
      this.element.style.transition = "";
      if (this.glare) {
        this.glareElement.style.transition = "";
      }
    }, this.settings.speed);

  }

  /**
   * Method return patched settings of instance
   * @param {boolean} settings.reverse - reverse the tilt direction
   * @param {number} settings.max - max tilt rotation (degrees)
   * @param {number} settings.perspective - Transform perspective, the lower the more extreme the tilt gets
   * @param {string} settings.easing - Easing on enter/exit
   * @param {number} settings.scale - 2 = 200%, 1.5 = 150%, etc..
   * @param {number} settings.speed - Speed of the enter/exit transition
   * @param {boolean} settings.transition - Set a transition on enter/exit
   * @param settings.axis - What axis should be disabled. Can be X or Y
   * @param {boolean} settings.glare - What axis should be disabled. Can be X or Y
   * @param {number} settings.max-glare - the maximum "glare" opacity (1 = 100%, 0.5 = 50%)
   * @param {boolean} settings.glare-prerender - false = VanillaTilt creates the glare elements for you, otherwise
   * @param {boolean} settings.reset - false = If the tilt effect has to be reset on exit
   * @param {boolean} settings.mouseEventElement - String selector or link to HTML-element what will be listen mouse events
   */
  extendSettings(settings) {
    let defaultSettings = {
      reverse: false,
      max: 35,
      perspective: 1000,
      easing: 'cubic-bezier(.03,.98,.52,.99)',
      scale: 1,
      speed: 300,
      transition: true,
      axis: null,
      glare: false,
      'max-glare': 1,
      "glare-prerender": false,
      reset: true,
      mouseEventElement: null,
    };

    let newSettings = {};
    for (var property in defaultSettings) {
      if (property in settings) {
        newSettings[property] = settings[property];
      } else if (this.element.hasAttribute("data-tilt-" + property)) {
        let attribute = this.element.getAttribute("data-tilt-" + property);
        try {
          newSettings[property] = JSON.parse(attribute);
        } catch (e) {
          newSettings[property] = attribute;
        }

      } else {
        newSettings[property] = defaultSettings[property];
      }
    }

    return newSettings;
  }

  static init(elements, settings) {
    if (elements instanceof Node) {
      elements = [elements];
    }

    if (elements instanceof NodeList) {
      elements = [].slice.call(elements);
    }

    if (!(elements instanceof Array)) {
      return;
    }

    elements.forEach((element) => {
      if (!("vanillaTilt" in element)) {
        element.vanillaTilt = new VanillaTilt(element, settings);
      }
    });
  }
}

if (typeof document !== "undefined") {
  /* expose the class to window */
  window.VanillaTilt = VanillaTilt;

  /**
   * Auto load
   */
  VanillaTilt.init(document.querySelectorAll("[data-tilt]"));
}

export default VanillaTilt;