MultiplePageView.m

/*
     File: MultiplePageView.m
 Abstract: View which holds all the pages together in the multiple-page case.
  Version: 1.7.1
 
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 */

#import <Cocoa/Cocoa.h>
#import "MultiplePageView.h"
#import "TextEditMisc.h"

@implementation MultiplePageView

- (id)initWithFrame:(NSRect)rect {
    if ((self = [super initWithFrame:rect])) {
        numPages = 0;
        [self setLineColor:[NSColor lightGrayColor]];
        [self setMarginColor:[NSColor whiteColor]];
	/* This will set the frame to be whatever's appropriate... */
        [self setPrintInfo:[NSPrintInfo sharedPrintInfo]];
    }
    return self;
}

- (BOOL)isFlipped {
    return YES;
}

- (BOOL)isOpaque {
    return YES;
}

- (void)updateFrame {
    if ([self superview]) {
        NSRect rect = NSZeroRect;
        rect.size = [printInfo paperSize];
        if (NSTextLayoutOrientationHorizontal == layoutOrientation) {
            rect.size.height = rect.size.height * numPages;
            if (numPages > 1) rect.size.height += [self pageSeparatorHeight] * (numPages - 1);
        } else {
            rect.size.width = rect.size.width * numPages;
            if (numPages > 1) rect.size.width += [self pageSeparatorHeight] * (numPages - 1);
        }
        rect.size = [self convertSize:rect.size toView:[self superview]];
        [self setFrame:rect];
    }
}

- (void)setPrintInfo:(NSPrintInfo *)anObject {
    if (printInfo != anObject) {
        [printInfo autorelease];
        printInfo = [anObject copyWithZone:[self zone]];
        [self updateFrame];
        [self setNeedsDisplay:YES];	/* Because the page size or margins might change (could optimize this) */
    }
}

- (NSPrintInfo *)printInfo {
    return printInfo;
}

- (void)setNumberOfPages:(NSUInteger)num {
    if (numPages != num) {
	NSRect oldFrame = [self frame];
        NSRect newFrame;
        numPages = num;
        [self updateFrame];
	newFrame = [self frame];
        if (newFrame.size.height > oldFrame.size.height) {
	    [self setNeedsDisplayInRect:NSMakeRect(oldFrame.origin.x, NSMaxY(oldFrame), oldFrame.size.width, NSMaxY(newFrame) - NSMaxY(oldFrame))];
        }
    }
}

- (NSUInteger)numberOfPages {
    return numPages;
}
    
- (CGFloat)pageSeparatorHeight {
    return 5.0;
}

- (void)dealloc {
    [printInfo release];
    [super dealloc];
}

- (NSSize)documentSizeInPage {
    return documentSizeForPrintInfo(printInfo);
}

- (NSRect)documentRectForPageNumber:(NSUInteger)pageNumber {	/* First page is page 0, of course! */
    NSRect rect = [self pageRectForPageNumber:pageNumber];
    rect.origin.x += [printInfo leftMargin] - defaultTextPadding();
    rect.origin.y += [printInfo topMargin];
    rect.size = [self documentSizeInPage];
    return rect;
}

- (NSRect)pageRectForPageNumber:(NSUInteger)pageNumber {
    NSRect rect;
    rect.size = [printInfo paperSize];
    rect.origin = [self frame].origin;

    if (NSTextLayoutOrientationHorizontal == layoutOrientation) {
        rect.origin.y += ((rect.size.height + [self pageSeparatorHeight]) * pageNumber);
    } else {
        rect.origin.x += (NSWidth([self bounds]) - ((rect.size.width + [self pageSeparatorHeight]) * (pageNumber + 1)));
    }
    return rect;
}

- (void)setLineColor:(NSColor *)color {
    if (color != lineColor) {
        [lineColor autorelease];
        lineColor = [color copyWithZone:[self zone]];
        [self setNeedsDisplay:YES];
    }
}

- (NSColor *)lineColor {
    return lineColor;
}

- (void)setMarginColor:(NSColor *)color {
    if (color != marginColor) {
        [marginColor autorelease];
        marginColor = [color copyWithZone:[self zone]];
        [self setNeedsDisplay:YES];
    }
}

- (NSColor *)marginColor {
    return marginColor;
}

- (void)setLayoutOrientation:(NSTextLayoutOrientation)orientation {
    if (orientation != layoutOrientation) {
        layoutOrientation = orientation;

        [self updateFrame];
    }
}

- (NSTextLayoutOrientation)layoutOrientation {
    return layoutOrientation;
}

- (void)drawRect:(NSRect)rect {
    if ([[NSGraphicsContext currentContext] isDrawingToScreen]) {
        NSSize paperSize = [printInfo paperSize];
        NSUInteger firstPage;
        NSUInteger lastPage;
        NSUInteger cnt;

        if (NSTextLayoutOrientationHorizontal == layoutOrientation) {
            firstPage = NSMinY(rect) / (paperSize.height + [self pageSeparatorHeight]);
            lastPage = NSMaxY(rect) / (paperSize.height + [self pageSeparatorHeight]);
        } else {
            firstPage = numPages - (NSMaxX(rect) / (paperSize.width + [self pageSeparatorHeight]));
            lastPage = numPages - (NSMinX(rect) / (paperSize.width + [self pageSeparatorHeight]));
        }

        [marginColor set];
        NSRectFill(rect);

        [lineColor set];
        for (cnt = firstPage; cnt <= lastPage; cnt++) {
	    // Draw boundary around the page, making sure it doesn't overlap the document area in terms of pixels
	    NSRect docRect = NSInsetRect([self centerScanRect:[self documentRectForPageNumber:cnt]], -1.0, -1.0);
	    NSFrameRectWithWidth(docRect, 1.0);
        }

        if ([[self superview] isKindOfClass:[NSClipView class]]) {
	    NSColor *backgroundColor = [(NSClipView *)[self superview] backgroundColor];
            [backgroundColor set];
            for (cnt = firstPage; cnt <= lastPage; cnt++) {
		NSRect pageRect = [self pageRectForPageNumber:cnt];
                NSRect separatorRect;
                if (NSTextLayoutOrientationHorizontal == layoutOrientation) {
                    separatorRect = NSMakeRect(NSMinX(pageRect), NSMaxY(pageRect), NSWidth(pageRect), [self pageSeparatorHeight]);
                } else {
                    separatorRect = NSMakeRect(NSMaxX(pageRect), NSMinY(pageRect), [self pageSeparatorHeight], NSHeight(pageRect));
                }
		NSRectFill (separatorRect);
            }
        }
    }
}

/**** Printing support... ****/

- (BOOL)knowsPageRange:(NSRangePointer)aRange {
    aRange->length = [self numberOfPages];
    return YES;
}

- (NSRect)rectForPage:(NSInteger)page {
    return [self documentRectForPageNumber:page-1];  /* Our page numbers start from 0; the kit's from 1 */
}

/* This method makes sure that we center the view on the page. By default, the text view "bleeds" into the margins by defaultTextPadding() as a way to provide padding around the editing area. If we don't do anything special, the text view appears at the margin, which causes the text to be offset on the page by defaultTextPadding(). This method makes sure the text is centered.
*/
- (NSPoint)locationOfPrintRect:(NSRect)rect {
    NSSize paperSize = [printInfo paperSize];
    return NSMakePoint((paperSize.width - rect.size.width) / 2.0, (paperSize.height - rect.size.height) / 2.0);
}

- (BOOL)showsScalePopUpButton { return YES; }

@end


NSSize documentSizeForPrintInfo(NSPrintInfo *printInfo) {
    NSSize paperSize = [printInfo paperSize];
    paperSize.width -= ([printInfo leftMargin] + [printInfo rightMargin]) - defaultTextPadding() * 2.0;
    paperSize.height -= ([printInfo topMargin] + [printInfo bottomMargin]);
    return paperSize;
}