MultiplePageView.m

/*
        MultiplePageView.m
        Copyright (c) 1995-2009 by Apple Computer, Inc., all rights reserved.
        Author: Ali Ozer

        View which holds all the pages together in the multiple-page case
*/
/*
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 derivative works or by other works in which the Apple Software may be incorporated.
 
 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO WARRANTIES, 
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 USE AND OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
 
 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL 
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*/

#import <Cocoa/Cocoa.h>
#import "MultiplePageView.h"
#import "Document.h"	// For defaultTextPadding();
#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];
        rect.size.height = rect.size.height * numPages;
        if (numPages > 1) rect.size.height += [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 {
    NSSize paperSize = [printInfo paperSize];
    paperSize.width -= ([printInfo leftMargin] + [printInfo rightMargin]) - defaultTextPadding() * 2.0;
    paperSize.height -= ([printInfo topMargin] + [printInfo bottomMargin]);
    return paperSize;
}

- (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;
    rect.origin.y += ((rect.size.height + [self pageSeparatorHeight]) * pageNumber);
    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)drawRect:(NSRect)rect {
    if ([[NSGraphicsContext currentContext] isDrawingToScreen]) {
        NSSize paperSize = [printInfo paperSize];
        NSUInteger firstPage = rect.origin.y / (paperSize.height + [self pageSeparatorHeight]);
        NSUInteger lastPage = NSMaxY(rect) / (paperSize.height + [self pageSeparatorHeight]);
        NSUInteger cnt;
        
        [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];
		NSRectFill (NSMakeRect(pageRect.origin.x, NSMaxY(pageRect), pageRect.size.width, [self pageSeparatorHeight]));
            }
        }
    }
}

/**** 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);
}

@end