githubmirror/materialize

js/global.js
153 строки4 KB
Chang Alan
generalized throttle and added to scrollFire
21 ноя 2016, 03:34
21 ноя 2016, 03:340257ec7
// Required for Meteor package, the use of window prevents export by Meteor
(function(window){
  if(window.Package){
    Materialize = {};
  } else {
    window.Materialize = {};
  }
})(window);


/*
 * raf.js
 * https://github.com/ngryman/raf.js
 *
 * original requestAnimationFrame polyfill by Erik Möller
 * inspired from paul_irish gist and post
 *
 * Copyright (c) 2013 ngryman
 * Licensed under the MIT license.
 */
(function(window) {
  var lastTime = 0,
    vendors = ['webkit', 'moz'],
    requestAnimationFrame = window.requestAnimationFrame,
    cancelAnimationFrame = window.cancelAnimationFrame,
    i = vendors.length;

  // try to un-prefix existing raf
  while (--i >= 0 && !requestAnimationFrame) {
    requestAnimationFrame = window[vendors[i] + 'RequestAnimationFrame'];
    cancelAnimationFrame = window[vendors[i] + 'CancelRequestAnimationFrame'];
  }

  // polyfill with setTimeout fallback
  // heavily inspired from @darius gist mod: https://gist.github.com/paulirish/1579671#comment-837945
  if (!requestAnimationFrame || !cancelAnimationFrame) {
    requestAnimationFrame = function(callback) {
      var now = +Date.now(),
        nextTime = Math.max(lastTime + 16, now);
      return setTimeout(function() {
        callback(lastTime = nextTime);
      }, nextTime - now);
    };

    cancelAnimationFrame = clearTimeout;
  }

  // export to window
  window.requestAnimationFrame = requestAnimationFrame;
  window.cancelAnimationFrame = cancelAnimationFrame;
}(window));


// Unique ID
Materialize.guid = (function() {
  function s4() {
    return Math.floor((1 + Math.random()) * 0x10000)
      .toString(16)
      .substring(1);
  }
  return function() {
    return s4() + s4() + '-' + s4() + '-' + s4() + '-' +
           s4() + '-' + s4() + s4() + s4();
  };
})();

/**
 * Escapes hash from special characters
 * @param {string} hash  String returned from this.hash
 * @returns {string}
 */
Materialize.escapeHash = function(hash) {
  return hash.replace( /(:|\.|\[|\]|,|=)/g, "\\$1" );
};

Materialize.elementOrParentIsFixed = function(element) {
    var $element = $(element);
    var $checkElements = $element.add($element.parents());
    var isFixed = false;
    $checkElements.each(function(){
        if ($(this).css("position") === "fixed") {
            isFixed = true;
            return false;
        }
    });
    return isFixed;
};


/**
 * Get time in ms
 * @license https://raw.github.com/jashkenas/underscore/master/LICENSE
 * @type {function}
 * @return {number}
 */
var getTime = (Date.now || function () {
  return new Date().getTime();
});


/**
 * Returns a function, that, when invoked, will only be triggered at most once
 * during a given window of time. Normally, the throttled function will run
 * as much as it can, without ever going more than once per `wait` duration;
 * but if you'd like to disable the execution on the leading edge, pass
 * `{leading: false}`. To disable execution on the trailing edge, ditto.
 * @license https://raw.github.com/jashkenas/underscore/master/LICENSE
 * @param {function} func
 * @param {number} wait
 * @param {Object=} options
 * @returns {Function}
 */
Materialize.throttle = function(func, wait, options) {
  var context, args, result;
  var timeout = null;
  var previous = 0;
  options || (options = {});
  var later = function () {
    previous = options.leading === false ? 0 : getTime();
    timeout = null;
    result = func.apply(context, args);
    context = args = null;
  };
  return function () {
    var now = getTime();
    if (!previous && options.leading === false) previous = now;
    var remaining = wait - (now - previous);
    context = this;
    args = arguments;
    if (remaining <= 0) {
      clearTimeout(timeout);
      timeout = null;
      previous = now;
      result = func.apply(context, args);
      context = args = null;
    } else if (!timeout && options.trailing !== false) {
      timeout = setTimeout(later, remaining);
    }
    return result;
  };
};


// Velocity has conflicts when loaded with jQuery, this will check for it
// First, check if in noConflict mode
var Vel;
if (jQuery) {
  Vel = jQuery.Velocity;
} else if ($) {
  Vel = $.Velocity;
} else {
  Vel = Velocity;
}