Re: [Leopard] bug in [NSGraphicsContext attributes]

FROM : Michael Monscheuer
DATE : Wed Nov 07 14:58:00 2007

Hi!

> This will not help if your goal is to distinguish between printing to
> a printer and printing to a PDF.


Right. We use -[NSGraphicsContext attributes] *and* -[NSGraphicsContext isDrawingToScreen]
on the current graphics context in -[NSView drawRect:] methods to distinguish between
screen, PDF, PS and manual bitmap contexts.

I filed a report (Bug ID# 5584898) with a simple example app attached.

I managed to find a workaround by (mis)using an existing hack in our app.
But I don't like hacks. Would feel better to be able to use the official API...

Michael

Ken Ferry schrieb:
> Hi Michael,
>
> Yes, please file a bug if something changed here.
>
> Would -[NSGraphicsContext isDrawingToScreen] work for you?  It really
> has more to do with whether the destination context is pixel-based
> than with whether it's the screen.
>
> "A return value of NO may mean that the drawing destination is a
> printer, but the destination may also be a PDF or EPS file."
>
> This will not help if your goal is to distinguish between printing to
> a printer and printing to a PDF.
>
> -Ken
> Cocoa Frameworks
>
> On Nov 6, 2007 5:02 AM, Michael Monscheuer <<email_removed>> wrote:

>> Hi!
>>
>> When creating an NSGraphicsContext using -graphicsContextWithGraphicsPort:flipped:
>> with a CGPDFContext as graphics port, the dictionary returned by -attributes
>> of the created NSGraphicsContext no longer contains the documented key-value pairs.
>>
>> In Tiger the attribute dict contains keys like
>> NSGraphicsContextRepresentationFormatAttributeName and
>> NSGraphicsContextDestinationAttributeName.
>> In Leopard no more.
>>
>> If you rely on these keys and values, I'd suggest to check your apps.
>>
>> As this bug also affects possible analysis while printing:
>> Any ideas how to find out if current context's graphics port
>> (e.g. while printing a PDF via NSPrintPanel) is a PDF context or not?
>>
>> Michael
>>
>> P.S.: Yes, I will file a bug report for sure :-)
>>
>> ---
>> Michael Monscheuer
>> www.icalamus.net
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>



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