topic Re: Extending the CallCanExecute enum for a ribbon button in Navisworks API Forum

Extending the CallCanExecute enum for a ribbon button

jonathonbroughton — Fri, 30 Dec 2016 12:33:10 GMT

Is there a way to extend the CallCanExecute enum for a RibbonButton? Currently there are options for

//     Command is Enabled unless specifically disabled by CanExecute implementation
       Always = 0,

//     Command is disabled if the doument is Clear
       DocumentNotClear = 1,

//     Command is Disabled unless there is a single selection
       CurrentSelectionSingle = 2,

//     Command is Disabled unless there are multiple selections
       CurrentSelectionMultiple = 3

I'd ideally like to have the CallCanExecute be linked to CurrentSelectionNotEmpty or similar.

Binding an event that sets IsEnabled on a button to the CurrentSelection works, but is immediately overridden by the CanExecute binding.

What's the best place to start with this, a custom CanExecute binding function?

Re: Extending the CallCanExecute enum for a ribbon button

rade_tomovic — Sun, 16 Apr 2017 09:40:52 GMT

Any answer to this? I also have the same problem.

Re: Extending the CallCanExecute enum for a ribbon button

logikgate — Mon, 17 Apr 2017 18:59:14 GMT

@jonathonbroughton,

As far as I know there is no way to add to the enum. However, I believe you can use a combination of CallCanExecute.DocumentNotClear and an if statement within your CanExecuteCommand method to get the functionality you want. Something like below

    [Command("SelectionButton",
                LoadForCanExecute = true,
                CallCanExecute = CallCanExecute.DocumentNotClear)]

    [Plugin("SomePluginName", "ABCD", ToolTip = "", DisplayName = "Some Name")]
    public class MyAddIn : CommandHandlerPlugin
    {
        public override CommandState CanExecuteCommand(string commandId)
        {
            CommandState state = new CommandState(true);
            switch (commandId)
            {
                case "SelectionButton":
                {
                    // Inactive if there is no selection
                    if (Application.ActiveDocument.CurrentSelection.IsEmpty == true)
                    {
                        state.IsEnabled = false;
                    }

                    break;
                }
            }

            return state;
        }
        
        public override int ExecuteCommand(string commandId, params string[] parameters)
        {
            switch (commandId)
            {
                case "SelectionButton":
                {
                    // do something cool
                    return 0;
                }
            }
        }
    }

Re: Extending the CallCanExecute enum for a ribbon button

Anonymous — Fri, 17 Aug 2018 17:36:06 GMT

@logikgate this will need an event listener on the selection event to enable the button again presumably?

Re: Extending the CallCanExecute enum for a ribbon button

logikgate — Sun, 19 Aug 2018 21:21:33 GMT

@Anonymous I suspect that you will not need an event listener to re-enable the button. Navisworks reevaluates the CanExecuteCommand periodically. It is possible that the button state may lag behind though as I'm not exactly sure what events in Navis actually trigger the reevaluation. If you implement this I would do it without the event listener first.

Re: Extending the CallCanExecute enum for a ribbon button

Anonymous — Wed, 22 Aug 2018 13:25:27 GMT

@logikgate I haven't found anything that causes DocumentCanExecute that causes the above implementation to re-evaluate.