在Objective-C中打印多页 [英] Printing multiple pages in Objective-C

问题描述

我具有如下打印功能:

- (void)sendToPrinter:(int)code {
    NSPrintInfo *printInfo;
    NSPrintInfo *sharedInfo;
    NSPrintOperation *printOp;
    NSMutableDictionary *printInfoDict;
    NSMutableDictionary *sharedDict;

    sharedInfo = [NSPrintInfo sharedPrintInfo];
    sharedDict = [sharedInfo dictionary];
    printInfoDict = [NSMutableDictionary dictionaryWithDictionary:
                     sharedDict];
    [printInfoDict setObject:NSPrintSpoolJob 
                      forKey:NSPrintJobDisposition];
    printInfo = [[NSPrintInfo alloc] initWithDictionary: printInfoDict];
    [printInfo setHorizontalPagination: NSAutoPagination];
    [printInfo setVerticalPagination: NSAutoPagination];
    [printInfo setVerticallyCentered:NO];
    [printInfo setLeftMargin:10];
    [printInfo setRightMargin:10];
    [printInfo setTopMargin:10];
    [printInfo setBottomMargin:10];
    [printInfo setScalingFactor:1.1];
    printOp = [NSPrintOperation printOperationWithView:sheet 
                                             printInfo:printInfo];
    [printOp setShowsPrintPanel:YES];
    [printOp runOperation];
}

这将打印称为 sheet 的页面预览的表示形式，该页面预览是NSBox.这很好.

This prints a representation of a page preview called sheet, which is an NSBox. This works fine.

有时候我有更多的信息适合页面，因此我有下一页"按钮，通过重新加载 sheet 以及相关数据.效果很好.

Sometimes I have more information that can fit on a page and so I have 'next page' buttons that fill sheet with a representation of Page2, Page3, etc. by reloading sheet with the relevant data. This works fine.

现在，如果我想打印出适合2或3页而不是1页的信息，我希望能够在打印前手动输入NSPrintInfo或NSPrintOperation其他页面，而不是分页.像这样:

Now, if I want to print out information that will fit on 2 or 3 pages rather than 1, I want to be able to feed NSPrintInfo or NSPrintOperation additional pages manually before it goes to print, rather than pagination. Something like:

printOp = [NSPrintOperation printOperationWithView:sheet 
                                             printInfo:printInfo];
[self nextPage];
printOp = [NSPrintOperation printOperationWithView:sheet 
                                             printInfo:printInfo];
[self nextPage];
printOp = [NSPrintOperation printOperationWithView:sheet 
                                             printInfo:printInfo];
// run this in loop until all the pages are accounted for
[printOp setShowsPrintPanel:YES];
[printOp runOperation];

有解决方案吗?预先感谢.

Any solutions? Thanks in advance.

推荐答案

您无法避免使用Cocoa打印系统进行分页.正如您的评论所提到的，您需要转到较低级别.

You can't avoid pagination with the Cocoa printing system; as your comment mentions, you'll need to go to something lower-level.

但是，我认为将您正在做的事情适应分页应该并不难.看看提供自定义分页方案和

However I don't think it should be too hard to adapt what you're doing to pagination. Take a look at Providing a Custom Pagination Scheme and Customizing a View's Drawing for Printing. Just subclass NSBox, provide rects that are the size of each page and adjust your coordinate system in beginPageInRect:atPlacement: so the box draws into the rect. You can get the current page number with [[NSPrintOperation currentOperation] currentPage] so you know what to draw.

更新:事实证明，如果您的视图尺寸正确，您甚至都不需要弄乱坐标系.这是一个非常简单的NSBox子类的示例，该子类仅更改每个页面的标题:

Update: Turns out you don't even need to mess with your coordinate system if your view is already the right size. Here's an example of a very simple NSBox subclass that just changes its title for every page:

@implementation NumberBox

- (BOOL)knowsPageRange:(NSRangePointer)aRange;
{
    *aRange = NSMakeRange(1, 10);
    return YES;
}

- (void)beginPageInRect:(NSRect)aRect atPlacement:(NSPoint)location;
{
    [self setTitle:[NSString stringWithFormat:@"Page %d", [[NSPrintOperation currentOperation] currentPage]]];
    [super beginPageInRect:aRect atPlacement:location];
}

- (NSRect)rectForPage:(NSInteger)page;
{
    return [self bounds];
}

@end

可能还不太明显的一件事是需要调用超类的beginPageInRect:atPlacement:实现.另外，请勿使用rectForPage:绘制，否则将无法正常工作-这就是beginPage…/endPage方法的作用.

One thing that may not have been obvious is the need to invoke the superclass's implementation of beginPageInRect:atPlacement:. Also, do not draw in rectForPage:, it won't work properly—that's the role of the beginPage…/endPage methods.

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