Question

How can I tell which nodes in my tree are visible to the user?

When the user expands a node, I would like to be able to adjust the display so that all the sub-nodes of that node are visible (without the user having to scroll up or down to see them).

Or is there a way of getting the Gant control to adjust the display automatically? I would ideally like the tree to work like the tree in Windows Explorer.

Answer

Both the phGantTimePackage and GTP.NET returns a rectangle of -1,-1,-1,-1 for the grid rect of cells that has not been drawn (because they are not currently on screen).

In phGantTimePackage you can use the IphGantRow3.GetRect method
and in GTP.NET you would use GridNode.Rect

The same applies to individual cells (that they return a -1 rect if not currently on screen).

Question

I would like to cancel a TimeItem move under certain conditions, and I tried using e.allow=false. It works in the sense that the TimeItem could not be moved horizontally, but it could still move vertically and would land itself on other rows (i.e. the X coordinate remained the same, but the Y coordinate has changed). Did I missed out any settings here? Thank you.

Answer

If you set e.Allow=false in the event OnTimeItem_Move the move in time will be stopped.
To Stop move in row you must implement the OnTimeItem_ChangeRow event and set e.Allow=false.

This way you can effectivly seperate the two kinds of move available.

Question

Can I define some areas as a “break” (e.g. holiday) area where I can color these areas with another color, and these areas do not allow items to be dropped (after being dragged.). These areas need to be different for each row. (e.g. Row1 – break areas are on Wednesdays; Row2 – Break areas are on Sundays and Mondays).

Answer

The GTP.NET object model does not currently contain this but as shown in the Gantt_TimeItem sample it can easily be achieved anyway;

First we define some standard time items and add our own BreakInfo object to the Userreference, then we implement the userDraw event and draw the time item and the break based on the info in our BreakInfo object.

This describes to hold break info in specific time items, if you would rather draw some information on the time item background take a look at this article: http://plexityhide.dyndns.org/InstantKB13/article.aspx?id=10278

    private void SetUpTimeItemAdvancedUserDraw()
    {
      GridNode gn=gantt1.Grid.GridStructure.RootNodes.AddNode();
      gn.GetCell(0).Content.Value="Sample of time item advanced user draw";
      GanttRow gr = GanttRow.FromGridNode(gn);
      gr.CollisionDetect=false;
      TimeItem ti1=gr.Layers[0].AddNewTimeItem();
      TimeItem ti2=gr.Layers[0].AddNewTimeItem();
      TimeItem ti3=gr.Layers[0].AddNewTimeItem();

      ti1.Start=gantt1.DateScaler.StartTime.AddDays(1);
      ti1.Stop=ti1.Start.AddDays(3);
      ti1.TimeItemLayout=new TimeItemLayout();
      ti1.TimeItemLayout.SelectHandles=Color.Black;
      ti1.TimeItemLayout.TimeItemStyle=TimeItemStyle.User;
      ti1.UserReference=new BreakInfo(1,0.5);
      
      ti2.Start=ti1.Stop.AddDays(1);
      ti2.Stop=ti2.Start.AddDays(4);
      ti2.TimeItemLayout=new TimeItemLayout();
      ti2.TimeItemLayout.SelectHandles=Color.Black;
      ti2.TimeItemLayout.TimeItemStyle=TimeItemStyle.User;
      ti2.UserReference=new BreakInfo(2,0.5);
    }

private void gantt1_OnTimeItem_UserDraw(PlexityHide.GTP.Gantt aGantt, PlexityHide.GTP.TimeItemEventArgs e)
{
        if (e.TimeItem.UserReference is BreakInfo)
        {
                // I have put my own object of class BreakInfo in the UserReferenece of the time item
                // And now I retrieve it and use the information within when drawing the time item
                BreakInfo breakInfo=e.TimeItem.UserReference as BreakInfo;


                DateTime breakStart=e.TimeItem.Start.AddDays(breakInfo.startsDaysFromStart).Add(e.Diff);
                DateTime breakStop=breakStart.AddDays(breakInfo.breakLengthInDays);

                int breakStartPixel=gantt1.DateScaler.TimeToPixel(breakStart);
                int breakStopPixel=gantt1.DateScaler.TimeToPixel(breakStop);


                if (gantt1.ScheduleMode)
                {
                        e.G.FillRectangle(new SolidBrush(Color.Blue),new Rectangle(e.Rect.Left,e.Rect.Top,e.Rect.Width,breakStartPixel-e.Rect.Top));
                        e.G.FillRectangle(new SolidBrush(Color.Blue),Rectangle.FromLTRB(e.Rect.Left,breakStopPixel,e.Rect.Right,e.Rect.Bottom));
                        e.G.DrawRectangle(new Pen(Color.Black),e.Rect);
                }
                else
                {
                        e.G.FillRectangle(new SolidBrush(Color.Blue),new Rectangle(e.Rect.Left,e.Rect.Top,breakStartPixel-e.Rect.Left,e.Rect.Height));
                        e.G.FillRectangle(new SolidBrush(Color.Blue),Rectangle.FromLTRB(breakStopPixel,e.Rect.Top,e.Rect.Right,e.Rect.Bottom));
                        e.G.DrawRectangle(new Pen(Color.Black),e.Rect);
                }

        }
}

Question

Hi,
it is possible to place a System.Windows.Forms.Button in a GridCell? It seems that there only some types (BoolCheck for Checkboxes, and ComboText for a Combobox), but I need a Button there.

I tried it with CustomCell and its Draw Event, but you can only use a Graphics Object to draw.

Content.Value = new Button() doesn’t work either.

Thanks!

Answer

In GTP.NET we currently have no Button cell ready, but to handle this and any other special cell that you might need in the future we added the CellType.CustomCell.

grid1.GridStructure.Columns.AddNew(CellType.CustomCell);

When you use this CellType you can implement some events to handle the different modes that a cell needs to handle:

 OnCustomCellDraw  Draw the content of the cell when not in edit mode 
 OnCustomCellEditStartByKey  Edit is started by key 
 OnCustomCellEditStartByMouse  Edit is started by clicking 
 OnCustomCellEndEdit  Edit is finished 
 OnCustomCellHeight 

I would suggest to only keep one button and put it in the cell when the cell enters edit mode (OnCustomCellEditStartByKey and OnCustomCellEditStartByMouse ), and when not in edit mode I would draw an image of a button (OnCustomCellDraw ), this way you will not overload windows with a button per row.

This is similair to how we do things internally with TextBox, ComboBox, DateTimePickar and checkbox.

Question

With GTP.Net.Web why must the GTPImg, minus.png and plus.png be within the same directory of as where I’m using GTP.Net on a aspx page. It would be a great improvement where if there was multiple charts in one application that are located in different areas that all those different charts could point to the same GTPImg.aspx,minus.png, and plus.png.

Answer

…eh… no good answer. We will add a new property PathToStaticImages with the following documentation: