(function ($) {

/**

 * Drag and drop table rows with field manipulation.

 *

 * Using the drupal_add_tabledrag() function, any table with weights or parent

 * relationships may be made into draggable tables. Columns containing a field

 * may optionally be hidden, providing a better user experience.

 *

 * Created tableDrag instances may be modified with custom behaviors by

 * overriding the .onDrag, .onDrop, .row.onSwap, and .row.onIndent methods.

 * See blocks.js for an example of adding additional functionality to tableDrag.

 */

Drupal.behaviors.tableDrag = {

  attach: function (context, settings) {

    for (var base in settings.tableDrag) {

      $('#' + base, context).once('tabledrag', function () {

        // Create the new tableDrag instance. Save in the Drupal variable

        // to allow other scripts access to the object.

        Drupal.tableDrag[base] = new Drupal.tableDrag(this, settings.tableDrag[base]);

      });

    }

  }

};

/**

 * Constructor for the tableDrag object. Provides table and field manipulation.

 *

 * @param table

 *   DOM object for the table to be made draggable.

 * @param tableSettings

 *   Settings for the table added via drupal_add_dragtable().

 */

Drupal.tableDrag = function (table, tableSettings) {

  var self = this;

  // Required object variables.

  this.table = table;

  this.tableSettings = tableSettings;

  this.dragObject = null; // Used to hold information about a current drag operation.

  this.rowObject = null; // Provides operations for row manipulation.

  this.oldRowElement = null; // Remember the previous element.

  this.oldY = 0; // Used to determine up or down direction from last mouse move.

  this.changed = false; // Whether anything in the entire table has changed.

  this.maxDepth = 0; // Maximum amount of allowed parenting.

  this.rtl = $(this.table).css('direction') == 'rtl' ? -1 : 1; // Direction of the table.

  // Configure the scroll settings.

  this.scrollSettings = { amount: 4, interval: 50, trigger: 70 };

  this.scrollInterval = null;

  this.scrollY = 0;

  this.windowHeight = 0;

  // Check this table's settings to see if there are parent relationships in

  // this table. For efficiency, large sections of code can be skipped if we

  // don't need to track horizontal movement and indentations.

  this.indentEnabled = false;

  for (var group in tableSettings) {

    for (var n in tableSettings[group]) {

      if (tableSettings[group][n].relationship == 'parent') {

        this.indentEnabled = true;

      }

      if (tableSettings[group][n].limit > 0) {

        this.maxDepth = tableSettings[group][n].limit;

      }

    }

  }

  if (this.indentEnabled) {

    this.indentCount = 1; // Total width of indents, set in makeDraggable.

    // Find the width of indentations to measure mouse movements against.

    // Because the table doesn't need to start with any indentations, we

    // manually append 2 indentations in the first draggable row, measure

    // the offset, then remove.

    var indent = Drupal.theme('tableDragIndentation');

    var testRow = $('<tr/>').addClass('draggable').appendTo(table);

    var testCell = $('<td/>').appendTo(testRow).prepend(indent).prepend(indent);

    this.indentAmount = $('.indentation', testCell).get(1).offsetLeft - $('.indentation', testCell).get(0).offsetLeft;

    testRow.remove();

  }

  // Make each applicable row draggable.

  // Match immediate children of the parent element to allow nesting.

  $('> tr.draggable, > tbody > tr.draggable', table).each(function () { self.makeDraggable(this); });

  // Add a link before the table for users to show or hide weight columns.

  $(table).before($('<a href="#" class="tabledrag-toggle-weight"></a>')

    .attr('title', Drupal.t('Re-order rows by numerical weight instead of dragging.'))

    .click(function () {

      if ($.cookie('Drupal.tableDrag.showWeight') == 1) {

        self.hideColumns();

      }

      else {

        self.showColumns();

      }

      return false;

    })

    .wrap('<div class="tabledrag-toggle-weight-wrapper"></div>')

    .parent()

  );

  // Initialize the specified columns (for example, weight or parent columns)

  // to show or hide according to user preference. This aids accessibility

  // so that, e.g., screen reader users can choose to enter weight values and

  // manipulate form elements directly, rather than using drag-and-drop..

  self.initColumns();

  // Add mouse bindings to the document. The self variable is passed along

  // as event handlers do not have direct access to the tableDrag object.

  $(document).bind('mousemove pointermove', function (event) { return self.dragRow(event, self); });

  $(document).bind('mouseup pointerup', function (event) { return self.dropRow(event, self); });

  $(document).bind('touchmove', function (event) { return self.dragRow(event.originalEvent.touches[0], self); });

  $(document).bind('touchend', function (event) { return self.dropRow(event.originalEvent.touches[0], self); });

};

/**

 * Initialize columns containing form elements to be hidden by default,

 * according to the settings for this tableDrag instance.

 *

 * Identify and mark each cell with a CSS class so we can easily toggle

 * show/hide it. Finally, hide columns if user does not have a

 * 'Drupal.tableDrag.showWeight' cookie.

 */

Drupal.tableDrag.prototype.initColumns = function () {

  for (var group in this.tableSettings) {

    // Find the first field in this group.

    for (var d in this.tableSettings[group]) {

      var field = $('.' + this.tableSettings[group][d].target + ':first', this.table);

      if (field.length && this.tableSettings[group][d].hidden) {

        var hidden = this.tableSettings[group][d].hidden;

        var cell = field.closest('td');

        break;

      }

    }

    // Mark the column containing this field so it can be hidden.

    if (hidden && cell[0]) {

      // Add 1 to our indexes. The nth-child selector is 1 based, not 0 based.

      // Match immediate children of the parent element to allow nesting.

      var columnIndex = $('> td', cell.parent()).index(cell.get(0)) + 1;

      $('> thead > tr, > tbody > tr, > tr', this.table).each(function () {

        // Get the columnIndex and adjust for any colspans in this row.

        var index = columnIndex;

        var cells = $(this).children();

        cells.each(function (n) {

          if (n < index && this.colSpan && this.colSpan > 1) {

            index -= this.colSpan - 1;

          }

        });

        if (index > 0) {

          cell = cells.filter(':nth-child(' + index + ')');

          if (cell[0].colSpan && cell[0].colSpan > 1) {

            // If this cell has a colspan, mark it so we can reduce the colspan.

            cell.addClass('tabledrag-has-colspan');

          }

          else {

            // Mark this cell so we can hide it.

            cell.addClass('tabledrag-hide');

          }

        }

      });

    }

  }

  // Now hide cells and reduce colspans unless cookie indicates previous choice.

  // Set a cookie if it is not already present.

  if ($.cookie('Drupal.tableDrag.showWeight') === null) {

    $.cookie('Drupal.tableDrag.showWeight', 0, {

      path: Drupal.settings.basePath,

      // The cookie expires in one year.

      expires: 365

    });

    this.hideColumns();

  }

  // Check cookie value and show/hide weight columns accordingly.

  else {

    if ($.cookie('Drupal.tableDrag.showWeight') == 1) {

      this.showColumns();

    }

    else {

      this.hideColumns();

    }

  }

};

/**

 * Hide the columns containing weight/parent form elements.

 * Undo showColumns().

 */

Drupal.tableDrag.prototype.hideColumns = function () {

  // Hide weight/parent cells and headers.

  $('.tabledrag-hide', 'table.tabledrag-processed').css('display', 'none');

  // Show TableDrag handles.

  $('.tabledrag-handle', 'table.tabledrag-processed').css('display', '');

  // Reduce the colspan of any effected multi-span columns.

  $('.tabledrag-has-colspan', 'table.tabledrag-processed').each(function () {

    this.colSpan = this.colSpan - 1;

  });

  // Change link text.

  $('.tabledrag-toggle-weight').text(Drupal.t('Show row weights'));

  // Change cookie.

  $.cookie('Drupal.tableDrag.showWeight', 0, {

    path: Drupal.settings.basePath,

    // The cookie expires in one year.

    expires: 365

  });

  // Trigger an event to allow other scripts to react to this display change.

  $('table.tabledrag-processed').trigger('columnschange', 'hide');

};

/**

 * Show the columns containing weight/parent form elements

 * Undo hideColumns().

 */

Drupal.tableDrag.prototype.showColumns = function () {

  // Show weight/parent cells and headers.

  $('.tabledrag-hide', 'table.tabledrag-processed').css('display', '');

  // Hide TableDrag handles.

  $('.tabledrag-handle', 'table.tabledrag-processed').css('display', 'none');

  // Increase the colspan for any columns where it was previously reduced.

  $('.tabledrag-has-colspan', 'table.tabledrag-processed').each(function () {

    this.colSpan = this.colSpan + 1;

  });

  // Change link text.

  $('.tabledrag-toggle-weight').text(Drupal.t('Hide row weights'));

  // Change cookie.

  $.cookie('Drupal.tableDrag.showWeight', 1, {

    path: Drupal.settings.basePath,

    // The cookie expires in one year.

    expires: 365

  });

  // Trigger an event to allow other scripts to react to this display change.

  $('table.tabledrag-processed').trigger('columnschange', 'show');

};

/**

 * Find the target used within a particular row and group.

 */

Drupal.tableDrag.prototype.rowSettings = function (group, row) {

  var field = $('.' + group, row);

  for (var delta in this.tableSettings[group]) {

    var targetClass = this.tableSettings[group][delta].target;

    if (field.is('.' + targetClass)) {

      // Return a copy of the row settings.

      var rowSettings = {};

      for (var n in this.tableSettings[group][delta]) {

        rowSettings[n] = this.tableSettings[group][delta][n];

      }

      return rowSettings;

    }

  }

};

/**

 * Take an item and add event handlers to make it become draggable.

 */

Drupal.tableDrag.prototype.makeDraggable = function (item) {

  var self = this;

  // Create the handle.

  var handle = $('<a href="#" class="tabledrag-handle"><div class="handle">&nbsp;</div></a>').attr('title', Drupal.t('Drag to re-order'));

  // Insert the handle after indentations (if any).

  if ($('td:first .indentation:last', item).length) {

    $('td:first .indentation:last', item).after(handle);

    // Update the total width of indentation in this entire table.

    self.indentCount = Math.max($('.indentation', item).length, self.indentCount);

  }

  else {

    $('td:first', item).prepend(handle);

  }

  // Add hover action for the handle.

  handle.hover(function () {

    self.dragObject == null ? $(this).addClass('tabledrag-handle-hover') : null;

  }, function () {

    self.dragObject == null ? $(this).removeClass('tabledrag-handle-hover') : null;

  });

  // Add the mousedown action for the handle.

  handle.bind('mousedown touchstart pointerdown', function (event) {

    if (event.originalEvent.type == "touchstart") {

      event = event.originalEvent.touches[0];

    }

    // Create a new dragObject recording the event information.

    self.dragObject = {};

    self.dragObject.initMouseOffset = self.getMouseOffset(item, event);

    self.dragObject.initMouseCoords = self.mouseCoords(event);

    if (self.indentEnabled) {

      self.dragObject.indentMousePos = self.dragObject.initMouseCoords;

    }

    // If there's a lingering row object from the keyboard, remove its focus.

    if (self.rowObject) {

      $('a.tabledrag-handle', self.rowObject.element).blur();

    }

    // Create a new rowObject for manipulation of this row.

    self.rowObject = new self.row(item, 'mouse', self.indentEnabled, self.maxDepth, true);

    // Save the position of the table.

    self.table.topY = $(self.table).offset().top;

    self.table.bottomY = self.table.topY + self.table.offsetHeight;

    // Add classes to the handle and row.

    $(this).addClass('tabledrag-handle-hover');

    $(item).addClass('drag');

    // Set the document to use the move cursor during drag.

    $('body').addClass('drag');

    if (self.oldRowElement) {

      $(self.oldRowElement).removeClass('drag-previous');

    }

    // Hack for IE6 that flickers uncontrollably if select lists are moved.

    if (navigator.userAgent.indexOf('MSIE 6.') != -1) {

      $('select', this.table).css('display', 'none');

    }

    // Hack for Konqueror, prevent the blur handler from firing.

    // Konqueror always gives links focus, even after returning false on mousedown.

    self.safeBlur = false;

    // Call optional placeholder function.

    self.onDrag();

    return false;

  });

  // Prevent the anchor tag from jumping us to the top of the page.

  handle.click(function () {

    return false;

  });

  // Similar to the hover event, add a class when the handle is focused.

  handle.focus(function () {

    $(this).addClass('tabledrag-handle-hover');

    self.safeBlur = true;

  });

  // Remove the handle class on blur and fire the same function as a mouseup.

  handle.blur(function (event) {

    $(this).removeClass('tabledrag-handle-hover');

    if (self.rowObject && self.safeBlur) {

      self.dropRow(event, self);

    }

  });

  // Add arrow-key support to the handle.

  handle.keydown(function (event) {

    // If a rowObject doesn't yet exist and this isn't the tab key.

    if (event.keyCode != 9 && !self.rowObject) {

      self.rowObject = new self.row(item, 'keyboard', self.indentEnabled, self.maxDepth, true);

    }

    var keyChange = false;

    switch (event.keyCode) {

      case 37: // Left arrow.

      case 63234: // Safari left arrow.

        keyChange = true;

        self.rowObject.indent(-1 * self.rtl);

        break;