項(xiàng)目管理軟件越來越強(qiáng)大，在甘特圖設(shè)計(jì)中，同時(shí)展開多個(gè)跨行時(shí)間表對象也逐漸成常態(tài)化趨勢。FlexGantt控件通過使用攔截命令實(shí)現(xiàn)此功能。

攔截器方法停止使用單一的常規(guī)命令，使用幾個(gè)常規(guī)命令組合成復(fù)合命令取代它。 每個(gè)命令設(shè)置時(shí)間跨度為一個(gè)基于對象的時(shí)間表，實(shí)現(xiàn)拖動(dòng)時(shí)間表對象。 前提是構(gòu)造復(fù)合命令攔截器檢索列表中的時(shí)間表對象，并且這個(gè)對象來至選擇模型對象層。

源碼如下：

setCommandInterceptor(DefaultChangeTimespanCommand.class, new ICommandInterceptor() {
   public boolean intercept(GanttChart gc, com.dlsc.flexgantt.command.ICommand cmd) {
      DefaultChangeTimelineObjectTimespanCommand command = 
        (DefaultChangeTimelineObjectTimespanCommand) cmd;
      TimelineObjectPath objectPath = new TimelineObjectPath(command.getNode().getPath(), 
                                                             command.getTimelineObject(), 
                                                             command.getLayer());
      LayerContainer lc = gc.getLayerContainer();
 
      /*
       * Just an example on how to look up the layer. This is application-specific.
       */
      Layer layer = MyModel.LAYER1;
 
      ITimelineObjectSelectionModel selectionModel = lc.getSelectionModel(planLayer);
      Iterator iter = selectionModel.getSelection();
      List list = new ArrayList();
      while (iter.hasNext()) {
         TimelineObjectPath path = iter.next();
         list.add(path);
      }
      if (list.size() > 1) {
         int result = JOptionPane.showConfirmDialog(gc, 
                                 "Move multiple?", 
                                 "Move",
                                 JOptionPane.YES_NO_CANCEL_OPTION);
         switch (result) {
            case JOptionPane.CANCEL_OPTION :
               return false;
            case JOptionPane.YES_OPTION :
               replanSelection(
                  list, 
                  objectPath, 
                  operationCommand.getOldTimeSpan(), 
                  operationCommand.getNewTimeSpan());
               return false;
            case JOptionPane.NO_OPTION :
               return true;
         }
      }
 
      return true;
   }
 
   private void replanSelection(List list, TimelineObjectPath originalPath, 
                                   ITimeSpan oldSpan, ITimeSpan newSpan) {
      AbstractCompoundCommand comp = new AbstractCompoundCommand("Multi Replan") {};
      long delta = oldSpan.getStartTime() - newSpan.getStartTime();
      for (TimelineObjectPath path : list) {
         ITimeSpan pathSpan = getModel().getTimeSpan(path.getTimelineObject());
         ITimeSpan span = new TimeSpan(pathSpan.getStartTime() - delta, 
                                       pathSpan.getEndTime() - delta);
         comp.addCommand(new DefaultChangeTimelineObjectTimespanCommand(
            (DefaultGanttChartNode) path.getNode(), 
            path.getLayer(), 
            (ITimelineObject) path.getTimelineObject(),
            (DefaultGanttChartModel) getModel(), 
            span, 
            DnDConstants.ACTION_MOVE));
      }
      getCommandStack().execute(comp, 
         new GanttChartProgressMonitor(myGanttChart));
   };
});

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