Hi,
I noticed an oddity while trying to track a Custom Task Pane among Powerpoint windows in my Addin.
I built an Addin for PowerPoint and it uses Custom Task Panes, and my intention was so that every presentation window would have its own instance of the Task Pane, which is very easy to do, once Addin.CustomTaskPanes.Add allows me to associate a panel to one specific window. I tried then to make a toogle button for my Custom Task Pane, associated to its visibility. I understand that the Ribbon has a single instance at runtime, and runs in Application level, instead of Document level, hence I needed to sync the Checked property of the toogle button to the visibility of the Custom Task Pane on that window once the window became active. Ok. And this is where I noticed an oddity:
Private Sub CTPs_SyncVisibility(Pres As PowerPoint.Presentation, Wn As PowerPoint.DocumentWindow) 'This handles Globals.PPTAddIn.Application.WindowActivate; Wn is a reference to the just activated window For Each ctp As CustomTaskPane In Globals.PPTAddIn.CustomTaskPanes If ctp.Window Is Wn Then 'Change the toogle button's Checked Property End If Next End Sub
When multiple presentation windows are open, each with its own taskpane associated, the line > If ctp.Window Is Wn Then <will aways return true, for every taskpane, implying that every
taskpane is associated to the window that became active, making it impossible to determine in which window a given taspane is.
Through some exploration I noticed a couple of things:
1. It's not a problem with Powerpoint Windows direct comparison, once the folowing lines of code return the expected result:
'Assume here that .Windows(1) is the actual active window Dim asw = Globals.PPTAddIn.Application.ActiveWindow Is Globals.PPTAddIn.Application.Windows(2) '-> False Dim asw2 = Globals.PPTAddIn.Application.ActiveWindow Is Globals.PPTAddIn.Application.Windows(1) '-> True Dim asw3 = Globals.PPTAddIn.Application.Windows(1) Is Globals.PPTAddIn.Application.Windows(2) '-> False
2. It doesn't seem to be a problem related to the property CustomTaskPane.Window once I tried to store the window reference in other property, like .Tag, during the instanciation of the Taskpanes, and it still yields the same weird result of True
for every Taskpane regardless of in which window it is.
So, my questions are: Is this a well known misbehavior of the Custom Task Pane? Does this happens somehow beacuse it is a COM object (the window)? Am I plain dumb and this is not the way it's supposed to be done? And lastly, which method should I use to track down in which window is my taskpane?
I thank you in advance,
Mximo
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