I cannot find any mention of what a view needs to do to support scaled
printing, so I thought it would be automatic as long as I adjust
things for the current scaling. Unfortunately, the view always prints
at 100% despite changing the scale setting in a page layout dialog.
Below is all the code I added for printing a flipped view that may
span multiple pages. The view has a bunch of framed subviews, each
containing some text and soon graphics, that are connected by lines (a
family tree).
The controller first sets the margins to the printable area (to
minimize number of pages needed) and then starts printing of the view
with
- (void)printChartView:(id)pview
{
NSPrintInfo *pi = [[self document] printInfo];
NSPrintOperation *printOp = [NSPrintOperation
printOperationWithView:pview printInfo:pi];
[printOp setShowPanels:YES];
[printOp runOperation];
}
The printing uses custom pagination (following Apple's example, but in
both directions instead of just vertical direction) and accounts for
scaling in the calculations. The knowsPageRange and rectForPage are
returning appropriate results for any scale setting, but the view
always prints at 100% and thus scaling does not print correctly (an
aside: at first I thought I should not even need knowsPageRange and
rectForPage and could use auto pagination instead; although it worked,
it did not use the margins I set up before printing and therefore used
less of each page). This view's drawRect method has nothing special
for printing (except to not highlight the currently selected subview).
// Return the number of pages available for printing
- (BOOL)knowsPageRange:(NSRangePointer)range
{
NSRect bounds = [self bounds];
NSSize printSize = [self calculatePrintSize];
range->location = 1;
int horiz = NSWidth(bounds)/printSize.width + 1;
int vert = NSHeight(bounds)/printSize.height + 1;
range->length = horiz*vert;
return YES;
}
// Return the drawing rectangle for a particular page number
- (NSRect)rectForPage:(int)page
{
NSRect bounds = [self bounds];
NSSize printSize = [self calculatePrintSize];
// hpage 1 to horiz and vpage 1 to vert (horiz and vert defined above)
int pagesForWidth = NSWidth(bounds)/printSize.width + 1;
int vpage = page/pagesForWidth;
int hpage = page % pagesForWidth;
if(hpage == 0)
hpage = pagesForWidth;
else
vpage++;
return NSMakeRect(NSMinX(bounds)+(hpage-1)*printSize.width,
NSMinY(bounds)+(vpage-1)*printSize.height,
printSize.width,printSize.height);
}
// Calculate the size of the view that fits on a single page
- (NSSize)calculatePrintSize
{
// Obtain the print info object for the current operation
NSPrintInfo *pi = [[NSPrintOperation currentOperation] printInfo];
// Calculate the page size in points
NSSize paperSize = [pi paperSize];
float pageHeight = paperSize.height - [pi topMargin] - [pi
bottomMargin];
float pageWidth = paperSize.width - [pi leftMargin] - [pi rightMargin];
// Convert size to the scaled view
float scale = [[[pi dictionary] objectForKey:NSPrintScalingFactor]
floatValue];
return NSMakeSize(pageWidth/scale, pageHeight/scale);
}
---------------
John Nairn (1-541-737-4265, FAX:1-541-737-3385)
Professor and Richardson Chair
Web Page: http://woodscience.oregonstate.edu/faculty/Nairn
FEA/MPM Web Page: http://oregonstate.edu/~nairnj
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