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/*
 * jQuery appear plugin
 *
 * Copyright (c) 2012 Andrey Sidorov
 * licensed under MIT license.
 *
 * https://github.com/morr/jquery.appear/
 *
 * Version: 0.4
 */
(function($) {
  var selectors = [];

  var check_binded = false;
  var check_lock = false;
  var defaults = {
    interval: 250,
    force_process: false
  };
  var $window = $(window);

  var $prior_appeared = [];

  function appeared(selector) {
    return $(selector).filter(function() {
      return $(this).is(':appeared');
    });
  }

  function process() {
    check_lock = false;
    for (var index = 0, selectorsLength = selectors.length; index < selectorsLength; index++) {
      var $appeared = appeared(selectors[index]);

      $appeared.trigger('appear', [$appeared]);

      if ($prior_appeared[index]) {
        var $disappeared = $prior_appeared[index].not($appeared);
        $disappeared.trigger('disappear', [$disappeared]);
      }
      $prior_appeared[index] = $appeared;
    }
  }

  function add_selector(selector) {
    selectors.push(selector);
    $prior_appeared.push();
  }

  // ":appeared" custom filter
  $.expr.pseudos.appeared = $.expr.createPseudo(function(arg) {
    return function(element) {
      var $element = $(element);
      if (!$element.is(':visible')) {
        return false;
      }

      var window_left = $window.scrollLeft();
      var window_top = $window.scrollTop();
      var offset = $element.offset();
      var left = offset.left;
      var top = offset.top;

      if (top + $element.height() >= window_top &&
          top - ($element.data('appear-top-offset') || 0) <= window_top + $window.height() &&
          left + $element.width() >= window_left &&
          left - ($element.data('appear-left-offset') || 0) <= window_left + $window.width()) {
        return true;
      } else {
        return false;
      }
    };
  });

  $.fn.extend({
    // watching for element's appearance in browser viewport
    appear: function(selector, options) {
      $.appear(this, options);
      return this;
    }
  });

  $.extend({
    appear: function(selector, options) {
      var opts = $.extend({}, defaults, options || {});

      if (!check_binded) {
        var on_check = function() {
          if (check_lock) {
            return;
          }
          check_lock = true;

          setTimeout(process, opts.interval);
        };

        $(window).scroll(on_check).resize(on_check);
        check_binded = true;
      }

      if (opts.force_process) {
        setTimeout(process, opts.interval);
      }

      add_selector(selector);
    },
    // force elements's appearance check
    force_appear: function() {
      if (check_binded) {
        process();
        return true;
      }
      return false;
    }
  });
})(function() {
  if (typeof module !== 'undefined') {
    // Node
    return require('jquery');
  } else {
    return jQuery;
  }
}());