I like composing controls and such over coming up with new views. This
frustrates me with printing, though, since it’s based on making a view, and
making sure that is page-cuttable. I made RTF-export for my app in the first
place because I thought there was an easy conversion to printing.
Poking around Stack Overflow, I realized that the view to print can be an
existing class. I could couple the document-data-to-NSAttributedString
operation I already wrote with a NSTextView to make something that a
NSPrintOperation could use:
> override func printOperation(withSettings printSettings: [String : Any])
> throws -> NSPrintOperation {
> // Copy the message to a string to print.
> var messageString: NSAttributedString! = /* … */
>
> // Create a view to visualize the message string.
> var info = self.printInfo.copy() as! NSPrintInfo
> info.dictionary().addEntries(from: printSettings)
>
> let view = NSTextView(frame: info.imageablePageBounds)
> view.autoresizingMask = [.viewWidthSizable, .viewHeightSizable]
> do {
> view.textStorage?.beginEditing()
> defer { view.textStorage?.endEditing() }
>
> view.textStorage?.setAttributedString(messageString)
> }
>
> return NSPrintOperation(view: view, printInfo: info)
> }
I hope it’s a nice first try, but I have some concerns.
1. I also added an “Export as PDF…” menu item, which uses the save-as-PDF
default action. I guess it calls my code, but the docs for
“NSDocument.pdfPrintOperation” say I should use a separate print-information
objects for PDF mode. Does the default code take care of that already? Or do I
have to figure out somehow if I’m in print-to-PDF mode or regular print mode
and change the initialization of “info” above to be “self.pdfPrintOperation” as
needed?
2. The RTF files I saved with the conversion operation have wrapping when
viewed through QuickLook. But the print-outs don’t do that; they do wrap, but
the limit is past the page margins so I lose part of the text. How can I set
the wrapping-mode/margins correctly.
3. Are there any other (subtle) problems with the text-view code, since I just
took it from Stack Overflow?
—
Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT mac DOT com
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