[APBeta] Exception on Canvas.Cancelled

[Paul Rodman]

On Aug 23, 2009, at 5:21 PM, Michael Portuesi wrote:

> Paul,
>
> I did the "Hunt the Wumpus" game with debug statements in my Print  
> finder Charts script.  They are pointing towards an exception  
> generated by Canvas.Cancelled:
>
> 		Debug "Point A"
>
> 		' Open a new printer document (or display window for preview)
> 		if prefs.isPreview then
> 			' Onscreen preview cannot be printed (it looks horrible on paper)
> 			c = new Canvas( w, h, nil, wtitle, false )
> 		else
> 			c = new Canvas( prefs.showPageSetup )
> 		end if
> 		
> 		Debug "Point B"
>
> 		' Loop and print charts/forms for selected objects
> 		if not c.Cancelled then
> 			
> 			Debug "Point C"
>
>
> I get "A" and "B" before the exception dialog, but not "C".
>
> The Framework Reference describes Cancelled as a read-only property  
> on the Canvas object.  Why would that cause an exception?

Probably a bug. I will check.

>
> I'm using 2.0b55 on Mac OS X 10.5.8, by the way.
>
> On a different note, I note that the Framework Reference lists the  
> existence of a PrinterCanvas object, which is a subclass of Canvas.   
> Should I be using PrinterCanvas instead of Canvas when rendering my  
> star charts to the printed page?

That's for printing the plan objects, observations and forms (now  
handled by a script). You could certainly create a printing script for  
your Finder Charts, but I suggest not messing with that right now as  
it's fairly non-trivial. It will (eventually) get documented.

Paul R.