On 11/06/2010, at 3:06 AM, Gideon King wrote:
> Hi, I have an offscreen view that I want to get the PDF data from. I use the
> dataWithPDFInsideRect method, but I have found that this creates an
> NSPrintOperation. This is a problem because I want to print using different
> settings for this view only when a *real* print operation is happening. I
> detect this in my drawing code like this:
>
> NSPrintOperation *printOperation = [NSPrintOperation currentOperation];
> if (printOperation && ![[NSGraphicsContext currentContext]
> isDrawingToScreen]) {
> [self doSpecialStuffForPrinting];
> }
>
> Now the problem is that my special printing stuff is being called when I use
> dataWithPDFInsideRect.
>
> I see there is an -isCopyingOperation method which can tell me whether it is
> sending to PDF at the time, but that is still not going to differentiate
> between the print to PDF from the print panel, and the dataWithPDFInsideRect.
>
> Is there any way of telling for sure whether it is a call to
> dataWithPDFInsideRect that caused the drawing to happen? If not, I guess I'll
> have to set up some sort of status variable, but I'd rather not if I don't
> have to.
I don't know the direct answer to your question, but there are alternative ways
to get PDF data out of a view, as a I put together some code to do almost
exactly that last week.
Essentially you create a PDF graphics context and draw into that.
-isDrawingToScreen should still return NO but AFAICT no print operation comes
into play.
My code looks like this:
NSSize size = [self bounds].size;
NSRect destRect = NSZeroRect;
destRect.size = size;
NSMutableData* pdfData = [NSMutableData data];
CGDataConsumerRef consumer =
CGDataConsumerCreateWithCFData((CFMutableDataRef) pdfData );
CGRect mediaBox = CGRectMake( 0, 0, size.width, size.height );
CGContextRef pdfContext = CGPDFContextCreate( consumer, &mediaBox, NULL
);
CGDataConsumerRelease( consumer );
NSAssert( pdfContext != NULL, @"could not create PDF context");
NSGraphicsContext* newGC = [NSGraphicsContext
graphicsContextWithGraphicsPort:pdfContext flipped:YES];
[NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext:newGC];
CGPDFContextBeginPage( pdfContext, NULL );
// here you do your drawing. In my case I flip the context and call a
method that draws an object into the current context.
// for a general purpose method operating on a view I guess you could
just call -drawRect: here having set a suitable CTM (or
// perhaps lockFocus/unlockFocus will handle that).
CGContextTranslateCTM( pdfContext, 0.0, size.height );
CGContextScaleCTM( pdfContext, 1.0, -1.0 );
[self drawContentInRect:destRect fromRect:NSZeroRect withStyle:nil];
// end of drawing
CGPDFContextEndPage( pdfContext );
[NSGraphicsContext restoreGraphicsState];
CGPDFContextClose( pdfContext );
CGContextRelease( pdfContext );
return pdfData;
--Graham
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