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Editing: jquery.sortable-table.js

/**
 * This file is internal to phpMyAdmin.
 * @license see the main phpMyAdmin license.
 *
 * @fileoverview    A jquery plugin that allows drag&drop sorting in tables.
 *                  Coded because JQuery UI sortable doesn't support tables. Also it has no animation
 *
 * @name            Sortable Table JQuery plugin
 *
 * @requires        jQuery
 */

/**
 * Options:
 *
 * $('table').sortableTable({
 *   ignoreRect: { top, left, width, height } - Relative coordinates on each element. If the user clicks
 *                                              in this area, it is not seen as a drag&drop request. Useful for toolbars etc.
 *   events: {
 *     start: callback function when the user starts dragging
 *     drop: callback function after an element has been dropped
 *   }
 * })
 */

/**
 * Commands:
 *
 * $('table').sortableTable('init')    - equivalent to $('table').sortableTable()
 * $('table').sortableTable('refresh') - if the table has been changed, refresh correctly assigns all events again
 * $('table').sortableTable('destroy') - removes all events from the table
 */

/**
 * Setup:
 *
 * Can be applied on any table, there is just one convention.
 * Each cell (<td>) has to contain one and only one element (preferably div or span)
 * which is the actually draggable element.
 */
(function ($) {
  jQuery.fn.sortableTable = function (method) {
    var methods = {
      init: function (options) {
        var tb = new SortableTableInstance(this, options);
        tb.init();
        $(this).data('sortableTable', tb);
      },
      refresh: function () {
        $(this).data('sortableTable').refresh();
      },
      destroy: function () {
        $(this).data('sortableTable').destroy();
      }
    };
    if (methods[method]) {
      return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
    } else if (typeof method === 'object' || !method) {
      return methods.init.apply(this, arguments);
    } else {
      $.error('Method ' + method + ' does not exist on jQuery.sortableTable');
    }
    function SortableTableInstance(table) {
      let options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
      var down = false;
      var $draggedEl;
      var oldCell;
      var previewMove;
      var id;

/* Mouse handlers on the child elements */
      var onMouseUp = function (e) {
        dropAt(e.pageX, e.pageY);
      };
      var onMouseDown = function (e) {
        $draggedEl = $(this).children();
        if ($draggedEl.length === 0) {
          return;
        }
        if (options.ignoreRect && insideRect({
          x: e.pageX - $draggedEl.offset().left,
          y: e.pageY - $draggedEl.offset().top
        }, options.ignoreRect)) {
          return;
        }
        down = true;
        oldCell = this;
        if (options.events && options.events.start) {
          options.events.start(this);
        }
        return false;
      };
      var globalMouseMove = function (e) {
        if (down) {
          move(e.pageX, e.pageY);
          if (inside($(oldCell), e.pageX, e.pageY)) {
            if (previewMove !== null) {
              moveTo(previewMove);
              previewMove = null;
            }
          } else {
            $(table).find('td').each(function () {
              if (inside($(this), e.pageX, e.pageY)) {
                if ($(previewMove).attr('class') !== $(this).children().first().attr('class')) {
                  if (previewMove !== null) {
                    moveTo(previewMove);
                  }
                  previewMove = $(this).children().first();
                  if (previewMove.length > 0) {
                    moveTo($(previewMove), {
                      pos: {
                        top: $(oldCell).offset().top - $(previewMove).parent().offset().top,
                        left: $(oldCell).offset().left - $(previewMove).parent().offset().left
                      }
                    });
                  }
                }
                return false;
              }
            });
          }
        }
        return false;
      };
      var globalMouseOut = function () {
        if (down) {
          down = false;
          if (previewMove) {
            moveTo(previewMove);
          }
          moveTo($draggedEl);
          previewMove = null;
        }
      };

// Initialize sortable table
      this.init = function () {
        id = 1;
        // Add some required css to each child element in the <td>s
        $(table).find('td').children().each(function () {
          // Remove any old occurrences of our added draggable-num class
          $(this).attr('class', $(this).attr('class').replace(/\s*draggable-\d+/g, ''));
          $(this).addClass('draggable-' + id++);
        });

// Mouse events
        $(table).find('td').on('mouseup', onMouseUp);
        $(table).find('td').on('mousedown', onMouseDown);
        $(document).on('mousemove', globalMouseMove);
        $(document).on('mouseleave', globalMouseOut);
      };

// Call this when the table has been updated
      this.refresh = function () {
        this.destroy();
        this.init();
      };
      this.destroy = function () {
        // Add some required css to each child element in the <td>s
        $(table).find('td').children().each(function () {
          // Remove any old occurrences of our added draggable-num class
          $(this).attr('class', $(this).attr('class').replace(/\s*draggable-\d+/g, ''));
        });

// Mouse events
        $(table).find('td').off('mouseup', onMouseUp);
        $(table).find('td').off('mousedown', onMouseDown);
        $(document).off('mousemove', globalMouseMove);
        $(document).off('mouseleave', globalMouseOut);
      };
      function switchElement(drag, dropTo) {
        var dragPosDiff = {
          left: $(drag).children().first().offset().left - $(dropTo).offset().left,
          top: $(drag).children().first().offset().top - $(dropTo).offset().top
        };
        var dropPosDiff = null;
        if ($(dropTo).children().length > 0) {
          dropPosDiff = {
            left: $(dropTo).children().first().offset().left - $(drag).offset().left,
            top: $(dropTo).children().first().offset().top - $(drag).offset().top
          };
        }

/* I love you append(). It moves the DOM Elements so gracefully <3 */
        // Put the element in the way to old place
        $(drag).append($(dropTo).children().first()).children().stop(true, true).on('mouseup', onMouseUp);
        if (dropPosDiff) {
          $(drag).append($(dropTo).children().first()).children().css('left', dropPosDiff.left + 'px').css('top', dropPosDiff.top + 'px');
        }

// Put our dragged element into the space we just freed up
        $(dropTo).append($(drag).children().first()).children().on('mouseup', onMouseUp).css('left', dragPosDiff.left + 'px').css('top', dragPosDiff.top + 'px');
        moveTo($(dropTo).children().first(), {
          duration: 100
        });
        moveTo($(drag).children().first(), {
          duration: 100
        });
        if (options.events && options.events.drop) {
          // Drop event. The drag child element is moved into the drop element
          // and vice versa. So the parameters are switched.

// Calculate row and column index
          const colIdx = $(dropTo).prevAll().length;
          const rowIdx = $(dropTo).parent().prevAll().length;
          options.events.drop(drag, dropTo, {
            col: colIdx,
            row: rowIdx
          });
        }
      }
      function move(x, y) {
        $draggedEl.offset({
          top: Math.min($(document).height(), Math.max(0, y - $draggedEl.height() / 2)),
          left: Math.min($(document).width(), Math.max(0, x - $draggedEl.width() / 2))
        });
      }
      function inside($el, x, y) {
        var off = $el.offset();
        return y >= off.top && x >= off.left && x < off.left + $el.width() && y < off.top + $el.height();
      }
      function insideRect(pos, r) {
        return pos.y > r.top && pos.x > r.left && pos.y < r.top + r.height && pos.x < r.left + r.width;
      }
      function dropAt(x, y) {
        if (!down) {
          return;
        }
        down = false;
        var switched = false;
        $(table).find('td').each(function () {
          if ($(this).children().first().attr('class') !== $(oldCell).children().first().attr('class') && inside($(this), x, y)) {
            switchElement(oldCell, this);
            switched = true;
          }
        });
        if (!switched) {
          if (previewMove) {
            moveTo(previewMove);
          }
          moveTo($draggedEl);
        }
        previewMove = null;
      }
      function moveTo(elem) {
        let opts = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
        if (!opts.pos) {
          opts.pos = {
            left: 0,
            top: 0
          };
        }
        if (!opts.duration) {
          opts.duration = 200;
        }
        $(elem).css('position', 'relative');
        $(elem).animate({
          top: opts.pos.top,
          left: opts.pos.left
        }, {
          duration: opts.duration,
          complete: function () {
            if (opts.pos.left === 0 && opts.pos.top === 0) {
              $(elem).css('position', '').css('left', '').css('top', '');
            }
          }
        });
      }
    }
  };
})(jQuery);

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