githubmirror/materialize

js/tapTarget.js
302 строки9 KB
Alvin Wang
Changed Materialize to M
02 ноя 2017, 10:31
02 ноя 2017, 10:3167f7883
(function ($) {
  'use strict';

  let _defaults = {
  };


  /**
   * @class
   *
   */
  class FeatureDiscovery {
    /**
     * Construct FeatureDiscovery instance
     * @constructor
     * @param {Element} el
     * @param {Object} options
     */
    constructor(el, options) {

      // If exists, destroy and reinitialize
      if (!!el.M_FeatureDiscovery) {
        el.M_FeatureDiscovery.destroy();
      }

      this.el = el;
      this.$el = $(el);
      this.el.M_FeatureDiscovery = this;

      /**
       * Options for the select
       * @member FeatureDiscovery#options
       */
      this.options = $.extend({}, FeatureDiscovery.defaults, options);

      this.isOpen = false;

      // setup
      this.$origin = $('#' + this.$el.attr('data-target'));
      this._setup();

      this._calculatePositioning();
      this._setupEventHandlers();
    }

    static get defaults() {
      return _defaults;
    }

    static init($els, options) {
      let arr = [];
      $els.each(function() {
        arr.push(new FeatureDiscovery(this, options));
      });
      return arr;
    }

    /**
     * Get Instance
     */
    static getInstance(el) {
      let domElem = !!el.jquery ? el[0] : el;
      return domElem.M_FeatureDiscovery;
    }

    /**
     * Teardown component
     */
    destroy() {
      this._removeEventHandlers();
      this.el.FeatureDiscovery = undefined;
    }

    /**
     * Setup Event Handlers
     */
    _setupEventHandlers() {
      this._handleDocumentClickBound = this._handleDocumentClick.bind(this);
      this._handleTargetClickBound = this._handleTargetClick.bind(this);
      this._handleOriginClickBound = this._handleOriginClick.bind(this);

      this.el.addEventListener('click', this._handleTargetClickBound);
      this.originEl.addEventListener('click', this._handleOriginClickBound);

      // Resize
      let throttledResize = M.throttle(this._handleResize, 200);
      this._handleThrottledResizeBound = throttledResize.bind(this);

      window.addEventListener('resize', this._handleThrottledResizeBound);
    }

    /**
     * Remove Event Handlers
     */
    _removeEventHandlers() {
      this.el.removeEventListener('click', this._handleTargetClickBound);
      this.originEl.removeEventListener('click', this._handleOriginClickBound);
      window.removeEventListener('resize', this._handleThrottledResizeBound);
    }

    /**
     * Handle Target Click
     * @param {Event} e
     */
    _handleTargetClick(e) {
      this.open();
    }

    /**
     * Handle Origin Click
     * @param {Event} e
     */
    _handleOriginClick(e) {
      this.close();
    }

    /**
     * Handle Resize
     * @param {Event} e
     */
    _handleResize(e) {
      this._calculatePositioning();
    }

    /**
     * Handle Resize
     * @param {Event} e
     */
    _handleDocumentClick(e) {
      if (!$(e.target).closest('.tap-target-wrapper').length) {
        this.close();
        e.preventDefault();
        e.stopPropagation();
      }
    }

    /**
     * Setup feature discovery
     */
    _setup() {
      // Creating tap target
      this.wrapper = this.$el.parent()[0];
      this.waveEl = $(this.wrapper).find('.tap-target-wave')[0];
      this.originEl = $(this.wrapper).find('.tap-target-origin')[0];
      this.contentEl = this.$el.find('.tap-target-content')[0];

      // Creating wrapper
      if (!$(this.wrapper).hasClass('.tap-target-wrapper')) {
        this.wrapper = document.createElement('div');
        this.wrapper.classList.add('tap-target-wrapper');
        this.$el.before($(this.wrapper));
        this.wrapper.append(this.el);
      }

      // Creating content
      if (!this.contentEl) {
        this.contentEl = document.createElement('div');
        this.contentEl.classList.add('tap-target-content');
        this.$el.append(this.contentEl);
      }

      // Creating foreground wave
      if (!this.waveEl) {
        this.waveEl = document.createElement('div');
        this.waveEl.classList.add('tap-target-wave');

        // Creating origin
        if (!this.originEl) {
          this.originEl = this.$origin.clone(true, true);
          this.originEl.addClass('tap-target-origin');
          this.originEl.removeAttr('id');
          this.originEl.removeAttr('style');
          this.originEl = this.originEl[0];
          this.waveEl.append(this.originEl);
        }

        this.wrapper.append(this.waveEl);
      }
    }

    /**
     * Calculate positioning
     */
    _calculatePositioning() {
      // Element or parent is fixed position?
      let isFixed = this.$origin.css('position') === 'fixed';
      if (!isFixed) {
        let parents = this.$origin.parents();
        for (let i = 0; i < parents.length; i++) {
          isFixed = $(parents[i]).css('position') == 'fixed';
          if (isFixed) {
            break;
          }
        }
      }

      // Calculating origin
      let originWidth = this.$origin.outerWidth();
      let originHeight = this.$origin.outerHeight();
      let originTop = isFixed ? this.$origin.offset().top - M.getDocumentScrollTop() : this.$origin.offset().top;
      let originLeft = isFixed ? this.$origin.offset().left - M.getDocumentScrollLeft() : this.$origin.offset().left;

      // Calculating screen
      let windowWidth = window.innerWidth;
      let windowHeight = window.innerHeight;
      let centerX = windowWidth / 2;
      let centerY = windowHeight / 2;
      let isLeft = originLeft <= centerX;
      let isRight = originLeft > centerX;
      let isTop = originTop <= centerY;
      let isBottom = originTop > centerY;
      let isCenterX = originLeft >= windowWidth*0.25 && originLeft <= windowWidth*0.75;

      // Calculating tap target
      let tapTargetWidth = this.$el.outerWidth();
      let tapTargetHeight = this.$el.outerHeight();
      let tapTargetTop = originTop + originHeight/2 - tapTargetHeight/2;
      let tapTargetLeft = originLeft + originWidth/2 - tapTargetWidth/2;
      let tapTargetPosition = isFixed ? 'fixed' : 'absolute';

      // Calculating content
      let tapTargetTextWidth = isCenterX ? tapTargetWidth : tapTargetWidth/2 + originWidth;
      let tapTargetTextHeight = tapTargetHeight/2;
      let tapTargetTextTop = isTop ? tapTargetHeight/2 : 0;
      let tapTargetTextBottom = 0;
      let tapTargetTextLeft = isLeft && !isCenterX ? tapTargetWidth/2 - originWidth : 0;
      let tapTargetTextRight = 0;
      let tapTargetTextPadding = originWidth;
      let tapTargetTextAlign = isBottom ? 'bottom' : 'top';

      // Calculating wave
      let tapTargetWaveWidth = originWidth > originHeight ? originWidth*2 : originWidth*2;
      let tapTargetWaveHeight = tapTargetWaveWidth;
      let tapTargetWaveTop = tapTargetHeight/2 - tapTargetWaveHeight/2;
      let tapTargetWaveLeft = tapTargetWidth/2 - tapTargetWaveWidth/2;

      // Setting tap target
      let tapTargetWrapperCssObj = {};
      tapTargetWrapperCssObj.top = isTop ? tapTargetTop + 'px' : '';
      tapTargetWrapperCssObj.right = isRight ? (windowWidth - tapTargetLeft - tapTargetWidth) + 'px' : '';
      tapTargetWrapperCssObj.bottom = isBottom ? (windowHeight - tapTargetTop - tapTargetHeight) + 'px' : '';
      tapTargetWrapperCssObj.left = isLeft ? tapTargetLeft + 'px' : '';
      tapTargetWrapperCssObj.position = tapTargetPosition;
      $(this.wrapper).css(tapTargetWrapperCssObj);

      // Setting content
      $(this.contentEl).css({
        width: tapTargetTextWidth + 'px',
        height: tapTargetTextHeight + 'px',
        top: tapTargetTextTop + 'px',
        right: tapTargetTextRight + 'px',
        bottom: tapTargetTextBottom + 'px',
        left: tapTargetTextLeft + 'px',
        padding: tapTargetTextPadding + 'px',
        verticalAlign: tapTargetTextAlign
      });

      // Setting wave
      $(this.waveEl).css({
        top: tapTargetWaveTop + 'px',
        left: tapTargetWaveLeft + 'px',
        width: tapTargetWaveWidth + 'px',
        height: tapTargetWaveHeight + 'px'
      });
    }

    /**
     * Open Feature Discovery
     */
    open() {
      if (this.isOpen) {
        return;
      }

      this.isOpen = true;
      this.wrapper.classList.add('open');

      document.body.addEventListener('click', this._handleDocumentClickBound, true);
    }

    /**
     * Close Feature Discovery
     */
    close() {
      if (!this.isOpen) {
        return;
      }

      this.isOpen = false;
      this.wrapper.classList.remove('open');

      document.body.removeEventListener('click', this._handleDocumentClickBound, true);
    }
  }

  M.FeatureDiscovery = FeatureDiscovery;

  if (M.jQueryLoaded) {
    M.initializeJqueryWrapper(FeatureDiscovery, 'featureDiscovery', 'M_FeatureDiscovery');
  }

}( cash ));