How to remove auto generated context menu items for the selected shape conditionally?


https://www.nevron.com/Forum/Topic10809.aspx 		Print Topic | Close Window

By Niranjan Singh - 8 Years Ago
Hi,
I need to remove all the context menu items for the selected diagram shape except the "Delete" and "update bounds" item. I have tried to remove all the command from the CommandBarManager contexts. It has removed most of the items from the context menu for the selected shape but I want it to display only two elements:
Update model bounds 
Delete

How can i remove another element the context menu. Specially the "Properties" menu item.

NControlHelper.BeginUpdate(nDiagramCommandBarsManager1.ParentControl);
// replace the toolbar builder with a custom one
nDiagramCommandBarsManager1.ToolbarsBuilder = new
  NCustomDiagramToolbarsBuilder(toolBarsItemCount,
  nDiagramCommandBarsManager1);

// recreate the command bars. Since we have replaced the toolbars builder,
// this will add the new commands in the toolbars.
// without this statement toolbar will not be refreshed with newly added
// tools. In addition to newly added tools even predefined tools will be available
// which are removed below.
nDiagramCommandBarsManager1.Recreate();
List<int[]> removingContexts = new List<int[]>(){{nDiagramCommandBarsManager1.
                  ToolbarsBuilder.
                  StandardCommandIds},
{nDiagramCommandBarsManager1.ToolbarsBuilder.LibraryCommandIds},
{nDiagramCommandBarsManager1.ToolbarsBuilder.ViewCommandIds},
{nDiagramCommandBarsManager1.ToolbarsBuilder.FormatCommandIds},
{nDiagramCommandBarsManager1.ToolbarsBuilder.ActionCommandIds},
{nDiagramCommandBarsManager1.ToolbarsBuilder.LayoutCommandIds},
{nDiagramCommandBarsManager1.ToolbarsBuilder.ToolsCommandIds}};


for (int iList = 0; iList < removingContexts.Count; iList++)
{
  for (int iContext = 0; iContext < removingContexts[iList].Length;
   iContext++)
  {
   NCommandContext commandContext = nDiagramCommandBarsManager1.Contexts.ContextFromID(removingContexts[iList][iContext]);
   if (commandContext != null && commandContext.ToString() == "Delete")
   {
    continue;
   }
   nDiagramCommandBarsManager1.Contexts.Remove(commandContext);
  }
}

nDiagramCommandBarsManager1.CommandContextExecuted += new
  CommandContextEventHandler(nDiagramCommandBarsManager1_CommandContextExecuted);
NControlHelper.EndUpdate(nDiagramCommandBarsManager1.ParentControl,
  true);


https://www.nevron.com/forum/uploads/images/e269ebf4-9d6b-4cbe-b53e-726b.png
Hope there is some way to customize the auto generated context menu. I am not able to get the context menu on  
on mouse down event. It found null always.

// Make sure the right mouse button was clicked
if (e.Button != MouseButtons.Right)
  return;

// Hit test the drawing document
NPointF location = new NPointF(e.Location);
NNodeList shapes = nDrawingView1.document.HitTest(location, -1, Nevron.Diagram.Filters.NFilters.TypeNCompositeShape, nDrawingView1.ProvideDocumentHitTestContext());
if (shapes.Count != 0 && nDrawingView1.ContextMenu != null)
{


Please suggest me the correct way to implement this..

Thanks,
Niranjan
By Nevron Support - 8 Years Ago
Hi,

There's a much easier way to achieve what you want. Instead of removing almost all commands one by one, you can simply create a custom context menu builder and add only the commands you want:

internal class CustomContextMenuBuilder : NDiagramContextMenuBuilder
{
    public override NContextMenu BuildContextMenu(object obj)
    {
        NContextMenu contextMenu = new NContextMenu();
        contextMenu.Commands.Add(CreateCommand((int)DiagramCommand.UpdateModelBounds, false));
        contextMenu.Commands.Add(CreateCommand((int)DiagramCommand.Delete, false));

        return contextMenu;
    }
}


You can then create an instance of this custom context menu builder and assign it to the ContextMenuBuilder property of your diagram command bars manager:

nDiagramCommandBarsManager1.ContextMenuBuilder = new CustomContextMenuBuilder();