public/static/common/js/plugin/slickgrid/plugins/slick.cellrangeselector.js

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(function ($) {
  // register namespace
  $.extend(true, window, {
    "Slick": {
      "CellRangeSelector": CellRangeSelector
    }
  });


  function CellRangeSelector(options) {
    var _grid;
    var _canvas;
    var _dragging;
    var _decorator;
    var _self = this;
    var _handler = new Slick.EventHandler();
    var _defaults = {
      selectionCss: {
        "border": "2px dashed blue"
      }
    };


    function init(grid) {
      options = $.extend(true, {}, _defaults, options);
      _decorator = new Slick.CellRangeDecorator(grid, options);
      _grid = grid;
      _canvas = _grid.getCanvasNode();
      _handler
        .subscribe(_grid.onDragInit, handleDragInit)
        .subscribe(_grid.onDragStart, handleDragStart)
        .subscribe(_grid.onDrag, handleDrag)
        .subscribe(_grid.onDragEnd, handleDragEnd);
    }

    function destroy() {
      _handler.unsubscribeAll();
    }

    function handleDragInit(e, dd) {
      // prevent the grid from cancelling drag'n'drop by default
      e.stopImmediatePropagation();
    }

    function handleDragStart(e, dd) {
      var cell = _grid.getCellFromEvent(e);
      if (_self.onBeforeCellRangeSelected.notify(cell) !== false) {
        if (_grid.canCellBeSelected(cell.row, cell.cell)) {
          _dragging = true;
          e.stopImmediatePropagation();
        }
      }
      if (!_dragging) {
        return;
      }

      _grid.focus();

      var start = _grid.getCellFromPoint(
          dd.startX - $(_canvas).offset().left,