nat/static/js/ripples.js

/* Copyright 2014+, Federico Zivolo, LICENSE at https://github.com/FezVrasta/bootstrap-material-design/blob/master/LICENSE.md */
/* globals jQuery, navigator */

(function($, window, document, undefined) {

  "use strict";

  /**
   * Define the name of the plugin
   */
  var ripples = "ripples";


  /**
   * Get an instance of the plugin
   */
  var self = null;


  /**
   * Define the defaults of the plugin
   */
  var defaults = {};


  /**
   * Create the main plugin function
   */
  function Ripples(element, options) {
    self = this;

    this.element = $(element);

    this.options = $.extend({}, defaults, options);

    this._defaults = defaults;
    this._name = ripples;

    this.init();
  }


  /**
   * Initialize the plugin
   */
  Ripples.prototype.init = function() {
    var $element  = this.element;

    $element.on("mousedown touchstart", function(event) {
      /**
       * Verify if the user is just touching on a device and return if so
       */
      if(self.isTouch() && event.type === "mousedown") {
        return;
      }


      /**
       * Verify if the current element already has a ripple wrapper element and
       * creates if it doesn't
       */
      if(!($element.find(".ripple-container").length)) {
        $element.append("<div class=\"ripple-container\"></div>");
      }


      /**
       * Find the ripple wrapper
       */
      var $wrapper = $element.children(".ripple-container");


      /**
       * Get relY and relX positions
       */
      var relY = self.getRelY($wrapper, event);
      var relX = self.getRelX($wrapper, event);


      /**
       * If relY and/or relX are false, return the event
       */
      if(!relY && !relX) {
        return;
      }


      /**
       * Get the ripple color
       */
      var rippleColor = self.getRipplesColor($element);


      /**
       * Create the ripple element
       */
      var $ripple = $("<div></div>");

      $ripple
      .addClass("ripple")
      .css({
        "left": relX,
        "top": relY,
        "background-color": rippleColor
      });


      /**
       * Append the ripple to the wrapper
       */
      $wrapper.append($ripple);


      /**
       * Make sure the ripple has the styles applied (ugly hack but it works)
       */
      (function() { return window.getComputedStyle($ripple[0]).opacity; })();


      /**
       * Turn on the ripple animation
       */
      self.rippleOn($element, $ripple);


      /**
       * Call the rippleEnd function when the transition "on" ends
       */
      setTimeout(function() {
        self.rippleEnd($ripple);
      }, 500);


      /**
       * Detect when the user leaves the element
       */
      $element.on("mouseup mouseleave touchend", function() {
        $ripple.data("mousedown", "off");

        if($ripple.data("animating") === "off") {
          self.rippleOut($ripple);
        }
      });

    });
  };


  /**
   * Get the new size based on the element height/width and the ripple width
   */
  Ripples.prototype.getNewSize = function($element, $ripple) {

    return (Math.max($element.outerWidth(), $element.outerHeight()) / $ripple.outerWidth()) * 2.5;
  };


  /**
   * Get the relX
   */
  Ripples.prototype.getRelX = function($wrapper,  event) {
    var wrapperOffset = $wrapper.offset();

    if(!self.isTouch()) {
      /**
       * Get the mouse position relative to the ripple wrapper
       */
      return event.pageX - wrapperOffset.left;
    } else {
      /**
       * Make sure the user is using only one finger and then get the touch
       * position relative to the ripple wrapper
       */
      event = event.originalEvent;

      if(event.touches.length === 1) {
        return event.touches[0].pageX - wrapperOffset.left;
      }

      return false;
    }
  };


  /**
   * Get the relY
   */
  Ripples.prototype.getRelY = function($wrapper, event) {
    var wrapperOffset = $wrapper.offset();

    if(!self.isTouch()) {
      /**
       * Get the mouse position relative to the ripple wrapper
       */
      return event.pageY - wrapperOffset.top;
    } else {
      /**
       * Make sure the user is using only one finger and then get the touch
       * position relative to the ripple wrapper
       */
      event = event.originalEvent;

      if(event.touches.length === 1) {
        return event.touches[0].pageY - wrapperOffset.top;
      }

      return false;
    }
  };


  /**
   * Get the ripple color
   */
  Ripples.prototype.getRipplesColor = function($element) {

    var color = $element.data("ripple-color") ? $element.data("ripple-color") : window.getComputedStyle($element[0]).color;

    return color;
  };


  /**
   * Verify if the client browser has transistion support
   */
  Ripples.prototype.hasTransitionSupport = function() {
    var thisBody  = document.body || document.documentElement;
    var thisStyle = thisBody.style;

    var support = (
      thisStyle.transition !== undefined ||
      thisStyle.WebkitTransition !== undefined ||
      thisStyle.MozTransition !== undefined ||
      thisStyle.MsTransition !== undefined ||
      thisStyle.OTransition !== undefined
    );

    return support;
  };


  /**
   * Verify if the client is using a mobile device
   */
  Ripples.prototype.isTouch = function() {
    return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);
  };


  /**
   * End the animation of the ripple
   */
  Ripples.prototype.rippleEnd = function($ripple) {
    $ripple.data("animating", "off");

    if($ripple.data("mousedown") === "off") {
      self.rippleOut($ripple);
    }
  };


  /**
   * Turn off the ripple effect
   */
  Ripples.prototype.rippleOut = function($ripple) {
    $ripple.off();

    if(self.hasTransitionSupport()) {
      $ripple.addClass("ripple-out");
    } else {
      $ripple.animate({"opacity": 0}, 100, function() {
        $ripple.trigger("transitionend");
      });
    }

    $ripple.on("transitionend webkitTransitionEnd oTransitionEnd MSTransitionEnd", function() {
      $ripple.remove();
    });
  };


  /**
   * Turn on the ripple effect
   */
  Ripples.prototype.rippleOn = function($element, $ripple) {
    var size = self.getNewSize($element, $ripple);

    if(self.hasTransitionSupport()) {
      $ripple
      .css({
        "-ms-transform": "scale(" + size + ")",
        "-moz-transform": "scale(" + size + ")",
        "-webkit-transform": "scale(" + size + ")",
        "transform": "scale(" + size + ")"
      })
      .addClass("ripple-on")
      .data("animating", "on")
      .data("mousedown", "on");
    } else {
      $ripple.animate({
        "width": Math.max($element.outerWidth(), $element.outerHeight()) * 2,
        "height": Math.max($element.outerWidth(), $element.outerHeight()) * 2,
        "margin-left": Math.max($element.outerWidth(), $element.outerHeight()) * (-1),
        "margin-top": Math.max($element.outerWidth(), $element.outerHeight()) * (-1),
        "opacity": 0.2
      }, 500, function() {
        $ripple.trigger("transitionend");
      });
    }
  };


  /**
   * Create the jquery plugin function
   */
  $.fn.ripples = function(options) {
    return this.each(function() {
      if(!$.data(this, "plugin_" + ripples)) {
        $.data(this, "plugin_" + ripples, new Ripples(this, options));
      }
    });
  };

})(jQuery, window, document);