text: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  /* global nf, d3 */
  
  nf.Selectable = (function () {
  
      return {
          init: function () {
  
          },
          
          select: function (g) {
              // hide any context menus as necessary
              nf.ContextMenu.hide();
  
              // only need to update selection if necessary
              if (!g.classed('selected')) {
                  // since we're not appending, deselect everything else
                  if (!d3.event.shiftKey) {
                      d3.selectAll('g.selected').classed('selected', false);
                  }
  
                  // update the selection
                  g.classed('selected', true);
              } else {
                  // we are currently selected, if shift key the deselect
                  if (d3.event.shiftKey) {
                      g.classed('selected', false);
                  }
              }
  
              // update the toolbar
              nf.CanvasToolbar.refresh();
  
              // stop propagation
              d3.event.stopPropagation();
          },
          
          activate: function (components) {
              components.on('mousedown.selection', function () {
                  // get the clicked component to update selection
                  nf.Selectable.select(d3.select(this));
              });
          }
      };
  }());