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/*

Quicksand 1.3

Reorder and filter items with a nice shuffling animation.

Copyright (c) 2010 Jacek Galanciak (razorjack.net) and agilope.com
Big thanks for Piotr Petrus (riddle.pl) for deep code review and wonderful docs & demos.

Dual licensed under the MIT and GPL version 2 licenses.
http://github.com/jquery/jquery/blob/master/MIT-LICENSE.txt
http://github.com/jquery/jquery/blob/master/GPL-LICENSE.txt

Project site: http://razorjack.net/quicksand
Github site: http://github.com/razorjack/quicksand

 */

(function($) {
  $.fn.quicksand = function(collection, customOptions) {
    var options = {
      duration : 750,
      easing : 'swing',
      attribute : 'data-id',        // attribute to recognize same items within source and dest
      adjustHeight : 'auto',        // 'dynamic' animates height during shuffling (slow), 'auto' adjusts it
                                    // before or after the animation, false leaves height constant
      adjustWidth : 'auto',         // 'dynamic' animates width during shuffling (slow), 
                                    // 'auto' adjusts it before or after the animation, false leaves width constant
      useScaling : false,           // enable it if you're using scaling effect
      enhancement : function(c) {}, // Visual enhacement (eg. font replacement) function for cloned elements
      selector : '> *',
      atomic : false,
      dx : 0,
      dy : 0,
      maxWidth : 0,
      retainExisting : true         // disable if you want the collection of items to be replaced completely by incoming items.
    };
    $.extend(options, customOptions);

    // Got IE and want scaling effect? Kiss my ass.
    if ($.browser.msie || (typeof ($.fn.scale) == 'undefined')) {
      options.useScaling = false;
    }

    var callbackFunction;
    if (typeof (arguments[1]) == 'function') {
      callbackFunction = arguments[1];
    } else if (typeof (arguments[2] == 'function')) {
      callbackFunction = arguments[2];
    }

    return this.each(function(i) {
      var val;
      var animationQueue = []; // used to store all the animation params before starting the animation;
      // solves initial animation slowdowns
      var $collection;
      if (typeof(options.attribute) == 'function') {
        $collection = $(collection);
      } else {
        $collection = $(collection).filter('[' + options.attribute + ']').clone(); // destination (target) collection
      }
      var $sourceParent = $(this); // source, the visible container of source collection
      var sourceHeight = $(this).css('height'); // used to keep height and document flow during the animation
      var sourceWidth = $(this).css('width'); // used to keep  width and document flow during the animation
      var destHeight, destWidth;
      var adjustHeightOnCallback = false;
      var adjustWidthOnCallback = false;
      var offset = $($sourceParent).offset(); // offset of visible container, used in animation calculations
      var offsets = []; // coordinates of every source collection item
      var $source = $(this).find(options.selector); // source collection items
      var width = $($source).innerWidth(); // need for the responsive design

      // Replace the collection and quit if IE6
      if ($.browser.msie && parseInt($.browser.version, 10) < 7) {
        $sourceParent.html('').append($collection);
        return;
      }

      // Gets called when any animation is finished
      var postCallbackPerformed = 0; // prevents the function from being called more than one time
      var postCallback = function() {
        $(this).css('margin', '').css('position', '').css('top', '').css('left', '').css('opacity', '');
        if (!postCallbackPerformed) {
          postCallbackPerformed = 1;

          if (!options.atomic) {
            // hack: used to be: $sourceParent.html($dest.html()); 
            // put target HTML into visible source container  
            // but new webkit builds cause flickering when replacing the collections
            var $toDelete = $sourceParent.find(options.selector);
            if (!options.retainExisting) {
              $sourceParent.prepend($dest.find(options.selector));
              $toDelete.remove();
            } else {
              // Avoid replacing elements because we may have already altered items in significant
              // ways and it would be bad to have to do it again. (i.e. lazy load images) 
              // But $dest holds the correct ordering. So we must re-sequence items in $sourceParent to match.
              var $keepElements = $([]);
              $dest.find(options.selector).each(function(i) {
                var $matchedElement = $([]);
                if (typeof (options.attribute) == 'function') {
                  var val = options.attribute($(this));
                  $toDelete.each(function() {
                    if (options.attribute(this) == val) {
                      $matchedElement = $(this);
                      return false;
                    }
                  });
                } else {
                  $matchedElement = $toDelete.filter(
                    '[' + options.attribute + '="'+ 
                    $(this).attr(options.attribute) + '"]');
                }
                if ($matchedElement.length > 0) {
                  // There is a matching element in the $toDelete list and in $dest
                  // list, so make sure it is in the right location within $sourceParent
                  // and put it in the list of elements we need to not delete.
                  $keepElements = $keepElements.add($matchedElement);
                  if (i === 0) {
                    $sourceParent.prepend($matchedElement);
                  } else {
                    $matchedElement.insertAfter($sourceParent.find(options.selector).get(i - 1));
                  }
                }
              });
              // Remove whatever is remaining from the DOM
              $toDelete.not($keepElements).remove();
            }

            if (adjustHeightOnCallback) {
              $sourceParent.css('height', destHeight);
            }
            if (adjustWidthOnCallback) {
              $sourceParent.css('width', sourceWidth);
            }
          }
          options.enhancement($sourceParent); // Perform custom visual enhancements on a newly replaced collection
          if (typeof callbackFunction == 'function') {
            callbackFunction.call(this);
          }
        }

        if (false === options.adjustHeight) {
          $sourceParent.css('height', 'auto');
        }

        if (false === options.adjustWidth) {
          $sourceParent.css('width', 'auto');
        }
      };

      // Position: relative situations
      var $correctionParent = $sourceParent.offsetParent();
      var correctionOffset = $correctionParent.offset();
      if ($correctionParent.css('position') == 'relative') {
        if ($correctionParent.get(0).nodeName.toLowerCase() != 'body') {
          correctionOffset.top += (parseFloat($correctionParent.css('border-top-width')) || 0);
          correctionOffset.left += (parseFloat($correctionParent.css('border-left-width')) || 0);
        }
      } else {
        correctionOffset.top -= (parseFloat($correctionParent.css('border-top-width')) || 0);
        correctionOffset.left -= (parseFloat($correctionParent.css('border-left-width')) || 0);
        correctionOffset.top -= (parseFloat($correctionParent.css('margin-top')) || 0);
        correctionOffset.left -= (parseFloat($correctionParent.css('margin-left')) || 0);
      }

      // perform custom corrections from options (use when Quicksand fails to detect proper correction)
      if (isNaN(correctionOffset.left)) {
        correctionOffset.left = 0;
      }
      if (isNaN(correctionOffset.top)) {
        correctionOffset.top = 0;
      }

      correctionOffset.left -= options.dx;
      correctionOffset.top -= options.dy;

      // keeps nodes after source container, holding their position
      $sourceParent.css('height', $(this).height());
      $sourceParent.css('width', $(this).width());

      // get positions of source collections
      $source.each(function(i) {
        offsets[i] = $(this).offset();
      });

      // stops previous animations on source container
      $(this).stop();
      var dx = 0;
      var dy = 0;
      $source.each(function(i) {
        $(this).stop(); // stop animation of collection items
        var rawObj = $(this).get(0);
        if (rawObj.style.position == 'absolute') {
          dx = -options.dx;
          dy = -options.dy;
        } else {
          dx = options.dx;
          dy = options.dy;
        }

        rawObj.style.position = 'absolute';
        rawObj.style.margin = '0';

        if (!options.adjustWidth) {
          rawObj.style.width = (width + 'px'); // sets the width to the current element
          // with even if it has been changed
          // by a responsive design
        }

        rawObj.style.top = (offsets[i].top- parseFloat(rawObj.style.marginTop) - correctionOffset.top + dy) + 'px';
        rawObj.style.left = (offsets[i].left- parseFloat(rawObj.style.marginLeft) - correctionOffset.left + dx) + 'px';

        if (options.maxWidth > 0 && offsets[i].left > options.maxWidth) {
          rawObj.style.display = 'none';
        }
      });

      // create temporary container with destination collection
      var $dest = $($sourceParent).clone();
      var rawDest = $dest.get(0);
      rawDest.innerHTML = '';
      rawDest.setAttribute('id', '');
      rawDest.style.height = 'auto';
      rawDest.style.width = $sourceParent.width() + 'px';
      $dest.append($collection);
      // Inserts node into HTML. Note that the node is under visible source container in the exactly same position
      // The browser render all the items without showing them (opacity: 0.0) No offset calculations are needed, 
      // the browser just extracts position from underlayered destination items and sets animation to destination positions.
      $dest.insertBefore($sourceParent);
      $dest.css('opacity', 0.0);
      rawDest.style.zIndex = -1;

      rawDest.style.margin = '0';
      rawDest.style.position = 'absolute';
      rawDest.style.top = offset.top - correctionOffset.top + 'px';
      rawDest.style.left = offset.left - correctionOffset.left + 'px';

      if (options.adjustHeight === 'dynamic') {
        // If destination container has different height than source container the height can be animated,
        // adjusting it to destination height
        $sourceParent.animate({ height : $dest.height() }, options.duration, options.easing);
      } else if (options.adjustHeight === 'auto') {
        destHeight = $dest.height();
        if (parseFloat(sourceHeight) < parseFloat(destHeight)) {
          // Adjust the height now so that the items don't move out of the container
          $sourceParent.css('height', destHeight);
        } else {
          // Adjust later, on callback
          adjustHeightOnCallback = true;
        }
      }

      if (options.adjustWidth === 'dynamic') {
        // If destination container has different width than source container the width can be animated, 
        // adjusting it to destination width
        $sourceParent.animate({ width : $dest.width() }, options.duration, options.easing);
      } else if (options.adjustWidth === 'auto') {
        destWidth = $dest.width();
        if (parseFloat(sourceWidth) < parseFloat(destWidth)) {
          // Adjust the height now so that the items don't move out of the container
          $sourceParent.css('width', destWidth);
        } else {
          // Adjust later, on callback
          adjustWidthOnCallback = true;
        }
      }

      // Now it's time to do shuffling animation. First of all, we need to identify same elements within
      // source and destination collections
      $source.each(function(i) {
        var destElement = [];
        if (typeof (options.attribute) == 'function') {
          val = options.attribute($(this));
          $collection.each(function() {
            if (options.attribute(this) == val) {
              destElement = $(this);
              return false;
            }
          });
        } else {
          destElement = $collection.filter('[' + options.attribute + '="' + $(this).attr(options.attribute) + '"]');
        }
        if (destElement.length) {
          // The item is both in source and destination collections. It it's under different position, let's move it
          if (!options.useScaling) {
            animationQueue.push({
              element : $(this), dest : destElement,
              style : {
                top : $(this).offset().top,
                left : $(this).offset().left,
                opacity : ""
              },
              animation : {
                top : destElement.offset().top - correctionOffset.top,
                left : destElement.offset().left - correctionOffset.left,
                opacity : 1.0
              }
            });
          } else {
            animationQueue.push({
              element : $(this), dest : destElement,
              style : {
                top : $(this).offset().top,
                left : $(this).offset().left,
                opacity : ""
              },
              animation : {
                top : destElement.offset().top - correctionOffset.top,
                left : destElement.offset().left - correctionOffset.left,
                opacity : 1.0,
                scale : '1.0'
              }
            });
          }
        } else {
          // The item from source collection is not present in destination collections.  Let's remove it
          if (!options.useScaling) {
            animationQueue.push({
              element : $(this),
              style : {
                top : $(this).offset().top,
                left : $(this).offset().left,
                opacity : ""
              },
              animation : {
                opacity : '0.0'
              }
            });
          } else {
            animationQueue.push({
              element : $(this),
              animation : {
                opacity : '0.0',
                style : {
                  top : $(this).offset().top,
                  left : $(this).offset().left,
                  opacity : ""
                },
                scale : '0.0'
              }
            });
          }
        }
      });

      $collection.each(function(i) {
        // Grab all items from target collection not present in visible source collection
        var sourceElement = [];
        var destElement = [];
        if (typeof (options.attribute) == 'function') {
          val = options.attribute($(this));
          $source.each(function() {
            if (options.attribute(this) == val) {
              sourceElement = $(this);
              return false;
            }
          });

          $collection.each(function() {
            if (options.attribute(this) == val) {
              destElement = $(this);
              return false;
            }
          });
        } else {
          sourceElement = $source.filter('[' + options.attribute + '="' + $(this).attr(options.attribute) + '"]');
          destElement = $collection.filter('[' + options.attribute + '="' + $(this).attr(options.attribute) + '"]');
        }

        var animationOptions;
        if (sourceElement.length === 0 && destElement.length > 0) {

          // No such element in source collection...
          if (!options.useScaling) {
            animationOptions = {opacity : '1.0'};
          } else {
            animationOptions = {opacity : '1.0', scale : '1.0'};
          }

          // Let's create it
          var d = destElement.clone();
          var rawDestElement = d.get(0);
          rawDestElement.style.position = 'absolute';
          rawDestElement.style.margin = '0';

          if (!options.adjustWidth) {
            // sets the width to the current element with even if it has been changed by a responsive design
            rawDestElement.style.width = width + 'px'; 
          }

          rawDestElement.style.top = destElement.offset().top - correctionOffset.top + 'px';
          rawDestElement.style.left = destElement.offset().left - correctionOffset.left + 'px';

          d.css('opacity', 0.0); // IE

          if (options.useScaling) {
            d.css('transform', 'scale(0.0)');
          }
          d.appendTo($sourceParent);

          if (options.maxWidth === 0 || destElement.offset().left < options.maxWidth) {
            animationQueue.push({element : $(d), dest : destElement,animation : animationOptions});
          }
        }
      });

      $dest.remove();
      if (!options.atomic) {
        options.enhancement($sourceParent); // Perform custom visual enhancements during the animation
        for (i = 0; i < animationQueue.length; i++) {
          animationQueue[i].element.animate(animationQueue[i].animation, options.duration, options.easing, postCallback);
        }
      } else {
        $toDelete = $sourceParent.find(options.selector);
        $sourceParent.prepend($dest.find(options.selector));
        for (i = 0; i < animationQueue.length; i++) {
          if (animationQueue[i].dest && animationQueue[i].style) {
            var destElement = animationQueue[i].dest;
            var destOffset = destElement.offset();

            destElement.css({
              position : 'relative',
              top : (animationQueue[i].style.top - destOffset.top),
              left : (animationQueue[i].style.left - destOffset.left)
            });

            destElement.animate({top : "0", left : "0"}, 
                                options.duration, 
                                options.easing, 
                                postCallback);
          } else {
            animationQueue[i].element.animate(animationQueue[i].animation, 
                                              options.duration, 
                                              options.easing,
                                              postCallback);
          }
        }
        $toDelete.remove();
      }
    });
  };
})(jQuery);