Question

I would like to use your Gantt control in one of our projects, but our clock doesnt have units.  We have a discrete simulation product.  One of our object types is called a scenario event.  It has a start and stop time so it makes sense to have them edit via a gantt chart.  Is there a way to change the date scaler to show numbers from 0 to infinity with zooming functionality like you have except broken up by powers of 10?

Answer

You can implement the OnDateScalerPaintForeground event and use the time base from Start to Stop to create your own scale presentation. This is the standing recomendation for clients that need something we never thought of in the first place, and it should give you complete freedom of that design; on the other hand it gives you complete freedom to do the work as well 🙂

Question

I am using GTP.Net and I would like to ask is it possible to drag a time item to a control for example ListView? I want the time item to be able to move around (change start time) when the cursor is within the gantt chart. But if the time item is drag to the listview (or the mouse is drag to the listview), I need to pick up the time item text (which is being drag) and display it to the ListView and delete it (the time item being drag). Is it possible? Thanks a lot.

Answer

You want to switch from internal drag drop to “Normal” windows forms drag drop. No sweat.

In the code below we choose to cancel the started internal mouse move operation and instead start the Control drag drop.

We then treat another Gantt as a reciver, but this is where you should handle you listbox...

    private void gantt1_OnTimeItemAreaMouseDown_1(object sender, System.Windows.Forms.MouseEventArgs e)
    {
      this.richTextBox1.Text = "gantt1_OnTimeItemAreaMouseDown\n" + this.richTextBox1.Text;
      if (gantt1.TimeItemFromPoint(e.X,e.Y)!=null)
      {
        TimeItem thedraggedTimedItem=gantt1.TimeItemFromPoint(e.X,e.Y);
        gantt1.TimeItemArea.DoDragDrop(thedraggedTimedItem,DragDropEffects.All);
        gantt1.MouseMoveCancel();
      }
    }

    
    private void TimeItemArea_DragOver(object sender, DragEventArgs e)
    {
      if (e.Data.GetDataPresent(typeof(PlexityHide.GTP.TimeItem)))
      {
        e.Effect=DragDropEffects.All;
      }
    }

    private void TimeItemArea_DragDrop(object sender, DragEventArgs e)
    {
      this.richTextBox1.Text = "DROP\n" ;
      GanttRow gr=gantt2.GanttRowFromY(gantt2.TimeItemArea.PointToClient(new Point(0,e.Y)).Y);
      //GanttRow gr=null;
      //Cell c=gantt2.Grid.GridStructure.CellFromXY(0,e.Y);
      //if (c!=null)
       // gr=GanttRow.FromGridNode(c.Node);
      if (e.Data.GetDataPresent(typeof(PlexityHide.GTP.TimeItem)) && gr!=null)
      {
        TimeItem theOneToMove=e.Data.GetData(typeof(PlexityHide.GTP.TimeItem)) as TimeItem;
        TimeItem nti=gr.Layers[0].AddNewTimeItem();
        nti.Start=theOneToMove.Start;
        nti.Stop=theOneToMove.Stop;
        
      }
    }

  }

Question

In gantt.net it is possible to move a timeitem by code(programmatically) from a ganttrow to the other one?

Answer

Yes. You do it by removing the time item from the old layer and add it to the new one: