topic Re: PostCommand & Modal dialog in Revit API Forum

PostCommand & Modal dialog

minet.axel — Fri, 09 Apr 2021 08:59:33 GMT

I want to use the Revit PostCommand through a button that is in a window (ShowDialog), because I want to keep Revit locked. But the problem is that the PostCommand only launches when my form is closed.

I had already done this using a While:
I create the form
I give him the datacontext
I am using a CommandToRun property on my ViewModel to determine what to do.
At the click of a button, I change my CommandToRun property and I close the form.
And then I determine whether or not to quit the while.

But the problem here is that the postcommand does not launch, because I open a form directly after clicking on the button.

public bool? ShowSeparationByZoneModalForm() { bool? res = null; Boolean reallyExit = false; while (!reallyExit) { // form.PopulateFormData(); if (viewModel.CommandToRun == RunCommand.None) { SeparationByZoneDialog form = new SeparationByZoneDialog(); form.Helper().Owner = RevitWindowHelper.GetRevitHandle(); form.DataContext = viewModel; res = form.ShowDialog(); switch (viewModel.CommandToRun) { case RunCommand.DrawLines: { App.DocumentChanged += OnDocumentChanged; UIApp.Idling += OnIdling; RevitCommandId modelLineCmd = RevitCommandId.LookupPostableCommandId(PostableCommand.ModelLine); UIApp.PostCommand(modelLineCmd); } break; case RunCommand.SelectLines: { viewModel.CommandToRun = RunCommand.None; var uidoc = new UIDocument(_doc); Selection choices = uidoc.Selection; try { Reference hasPickOne = choices.PickObject(ObjectType.Element); if (hasPickOne != null) viewModel.LineCounter += 1; } catch (Autodesk.Revit.Exceptions.OperationCanceledException oce) { } } break; case RunCommand.None: reallyExit = true; break; default: reallyExit = true; break; } } } return res; }

This method works great for making element selections in Revit keeping the window blocking but with postcommands it doesn't work.

Re: PostCommand & Modal dialog

dreamofbaby0507 — Fri, 09 Apr 2021 10:39:24 GMT

I'm not good at English! 🙂

You can refer to using template to work with revit api.

Link : https://github.com/imAliAsad/VisualStudioRevitTemplate

Hope to help you!!

Re: PostCommand & Modal dialog

RPTHOMAS108 — Sat, 10 Apr 2021 11:05:32 GMT

PostCommand is done after your context has finished. So can't be used for your scenario.

If all you need to do is draw a line or select lines from the same modal dialogue then the easiest way would be to reshow the same dialogue in-between other API methods (not post command) e.g.

UIDocument.Selection.PickPoint x 2 & Document.Create.NewModelCurve

UIDocument.Selection.PickObjects

Otherwise you need to implement IExternalEventHandler with modeless dialogue.

Re: PostCommand & Modal dialog

minet.axel — Sun, 11 Apr 2021 11:53:56 GMT

I want to use a post command. so i modified my form to use an IExternalEventHandler. thank you for the information.