25 July 2008

Plot Preview Gotcha

Here's a quick fix to a really annoying problem I was having. If you're making a custom plot routine using a modal form and have included plot preview functionality you'll quickly realize that as soon as the plot preview is displayed you're stuck. Completely stuck, escape key, right-click, everything is frozen. Apparently your plot form still has focus, even if hidden.

There's two fixes for this problem:

1) Use a modeless form. This includes adding document locks almost everywhere and is generally a pain in the butt.

2) Add a User Interaction, like this:

  Private Sub PlotPreview()

    Dim edUserInteraction As EditorUserInteraction = Application.DocumentManager.MdiActiveDocument.Editor.StartUserInteraction(Me)





      ' Do your plot preview


    Catch ex As System.Exception

      ' Error handling




      ' Show the form

      If Me.Visible = False Then Me.Show()

    End Try

  End Sub

The EditorUserInteraction object allows your modal form to give up focus and allow the plot preview to do what it's supposed to.

Simple fix for a very frustrating problem.

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