The easiest way to create a command bar commanding UI for a drawing view is to use the NDrawingViewWithCommandBars widget or if you are not creating a cross-platform application - to drop an NDrawingViewWithCommandBarsControl to a form/window using the Visual Studio Designer. You can then use the following approaches to modify the command bars:

1. Hiding Menus and Toolbars

To hide a command bar or a command bar item use the corresponding Get... method of the NDrawingViewWithCommandBars or NDrawingViewWithCommandBarsControl class and set its Visibility property to Collapsed:

• GetMainMenu - gets the main menu bar. When you get the menu bar, you can use its FindMenuDropDownByText method to get a specific menu drop down. Then if you want to hide a specific menu item from the drop down menu, you can use the Items.FindByText method of the menu item, but if the menu item does not contain sub menu items, it's better to use the RemoveCommands method discussed in the next section.
• GetTooBar - gets a toolbar with a given name.
• GetStatusBar - gets the status bar.

The following code snippet hides the "View" menu and the "View" toolbar, as well as the "File -> Import" menu item and its sub menu items.

// Hide the "View" menu drop down
nDrawingViewWithCommandBarsControl1.GetMainMenuBar()
    .FindMenuDropDownByText(NDiagramCommandBarBuilder.MenuViewName).Visibility = ENVisibility.Collapsed;

// Hide the "File -> Import" menu item
nDrawingViewWithCommandBarsControl1.GetMainMenuBar()
    .FindMenuDropDownByText(NDiagramCommandBarBuilder.MenuFileName)
    .Items.FindByText(NDiagramFileMenuBuilder.MenuImportName).Visibility = ENVisibility.Collapsed;

// Hide the "View" toolbar
nDrawingViewWithCommandBarsControl1.GetToolBar(
    NDiagramCommandBarBuilder.ToolbarViewName).Visibility = ENVisibility.Collapsed;

2. Removing Commands

To hide all widgets associated with specific commands from the commanding UI, use the RemoveCommands method of the drawing view with command bars.  For example, the code snippet below removes the Open command and hides the widgets associated with them from the command bars and also removes the page number command from the status bar:

NDrawingViewWithCommandBars drawingViewWithCommandBars = new NDrawingViewWithCommandBars();
drawingViewWithCommandBars.RemoveCommands(NDrawingView.OpenCommand, NDrawingView.PageNumberStatusBarCommand);

Always use the RemoveCommands item to remove individual menu and toolbar items, unless the menu item has sub items. In that case use the GetMainMenu method of the menu bar, then FindMenuDropDownByText to get the menu drop down and finally Items.FindByText to get the item with sub items, which you want to hide as shown in the previous section.

You can also create diagram command bars using the NDiagramCommandBarBuilder. This gives you greater flexibility and more ways to customize the NOV Diagram command bars, including an option to add custom commands to the command bars:

NDiagramCommandBarBuilder commandBarBuilder = new NDiagramCommandBarBuilder();
NCommandUIHolder drawingViewWithCommandBars = commandBarBuilder.CreateUI(drawingView);

1. Modifying the Builders Collection

If you want to remove a given toolbar or menu from the builders, you can easily do so by using the Remove method of the ToolBarBuilders and MenuDropDownBuilders collection of the diagram command bar builder respectively. You can get or remove builders by name.

The names of all diagram menu and toolbar builders are exposed as constants in the NDiagramCommandBarBuilder class. For example, to remove the "File" menu and the "Standard" toolbar of a command bars based diagram UI, you can use the following piece of code:

commandBarBuilder.MenuDropDownBuilders.Remove(NDiagramCommandBarBuilder.MenuFileName);
commandBarBuilder.ToolBarBuilders.Remove(NDiagramCommandBarBuilder.ToolbarStandardName);

In order to add or insert your own toolbar or menu drop down builder, you can use the Add or Insert methods of the corresponding builder collection respectively.

commandBarBuilder.MenuDropDownBuilders.Insert(1, new CustomMenuBuilder());
commandBarBuilder.ToolBarBuilders.Insert(0, new CustomToolBarBuilder());

2. Removing Commands

To hide all widgets associated with specific commands from the commanding UI, use the RemoveCommands method of the command UI holder created by the command bars builder. For example, the code snippet below removes the Open command and hides the widgets associated with them from the file menu and also removes the page number command from the status bar:

NDiagramCommandBarBuilder commandBarBuilder = new NDiagramCommandBarBuilder();
NCommandUIHolder drawingViewWithCommandBars = commandBarBuilder.CreateUI(drawingView);
drawingViewWithCommandBars.RemoveCommands(NDrawingView.OpenCommand, NDrawingView.PageNumberStatusBarCommand);

3. Custom Menu Builders

To create a custom menu builder, you should create a class, which inherits NMenuDropDownBuilder:

public class CustomMenuBuilder : NMenuDropDownBuilder
{
    public CustomMenuBuilder()
        : base("Custom Menu")
    {
    }

    protected override void AddItems(NMenuItemCollection items)
    {
        // Add the "Copy" menu item
        items.Add(CreateMenuItem(Nevron.Nov.Presentation.NResources.Image_Edit_Copy_png, NDrawingView.CopyCommand));

        // Add the custom command menu item
        items.Add(CreateMenuItem(NResources.Image_Ribbon_16x16_smiley_png, CustomCommand));
    }
}

4. Custom Toolbar Builders

To create a custom toolbar builder, you should create a class, which inherits the NToolBarBuilder:

public class CustomToolBarBuilder : NToolBarBuilder
{
    public CustomToolBarBuilder()
        : base("Custom Toolbar")
    {
    }

    protected override void AddItems(NCommandBarItemCollection items)
    {
        // Add the "Copy" button
        items.Add(CreateButton(Nevron.Nov.Presentation.NResources.Image_Edit_Copy_png, NDrawingView.CopyCommand));

        // Add the custom command button
        items.Add(CreateButton(NResources.Image_Ribbon_16x16_smiley_png, CustomCommand));
    }
}

To replace the original "Standard" toolbar builder with the custom one, use the following code:

NDiagramCommandBarBuilder commandBarBuilder = new NDiagramCommandBarBuilder();
int toolbarIndex = commandBarBuilder.ToolBarBuilders.IndexOf(NDiagramCommandBarBuilder.ToolbarStandardName);
commandBarBuilder.ToolBarBuilders[toolbarIndex] = new CustomStandardToolbar();

To see how to define a custom command and a custom command action, take a look at the Diagram Commanding Overview topic.

Commanding