//  PDFImageView.m

//  Copyright (c) 2003, Apple Computer, Inc. All rights reserved.

// See legal notice below.

#import "PDFImageView.h"

#import "DraggableScrollView.h"

@implementation PDFImageView

#pragma mark PRIVATE INSTANCE METHODS

//  pdfRep -- Return the image-representation used for PDFs. This

//  representation can tell us things like the PDF's page count.

- (NSPDFImageRep *) pdfRep

{

    //  Assume our sole representation is the PDF representation.

    return [[[self image] representations] lastObject];

}

#pragma mark PUBLIC INSTANCE METHODS

//  loadFromPath: -- Load the PDF at the specified path into the view.

//  This automatically resizes the view to fit all pages of the document.

- (void) loadFromPath: (NSString *) path

{

    NSPDFImageRep   *pdfRep;

    NSImage         *pdfImage;

    NSRect          frame;

    //  Load the file into an image-representation,

    //  then create an image and add the representation to it.

    pdfRep = [NSPDFImageRep imageRepWithContentsOfFile: path];

    pdfImage = [[[NSImage alloc] init] autorelease];

    [pdfImage addRepresentation: pdfRep];

    //  Figure our frame by getting the bounds, which is really the size

    //  of one page, and multiplying the height by the page count.

    frame = [pdfRep bounds];

    frame.size.height *= [pdfRep pageCount];

    //  Install the image (remember, we're an NSImageView subclass)

    [self setImage: pdfImage];

    //  Set our frame to match the PDF's full height (all pages)

    //  (don't involve our override of -setFrame:, or things won't work right)

    [super setFrame: frame];

    //  Always scroll to show the top of the image

    if ([self isFlipped])

        [self scrollPoint: NSMakePoint (0, 0)];

    else

        [self scrollPoint: NSMakePoint (0, frame.size.height)];

}

#pragma mark PUBLIC INSTANCE METHODS -- NSView OVERRIDES

//  drawRect: -- Display all pages of the PDF document.

- (void) drawRect: (NSRect) rect

{

    NSPDFImageRep   *rep;

    int             pageCount, pageNumber;

    NSRect          onePageBounds;

    //  Apparently, a PDF doesn't always draw its margins, so make them white

    //  by drawing our entire background as white.

    [[NSColor whiteColor] set];

    NSRectFill (rect);

    //  Get the information from the PDF image representation:

    //  how many pages, and how large is each one?

    rep = [self pdfRep];

    pageCount = [rep pageCount];

    //  Iterate through all pages

    for (pageNumber = 0; pageNumber < pageCount; pageNumber++)

    {

        //  Use the printing code (which uses one-based numbering) to find where

        //  this page appears.

        onePageBounds = [self rectForPage: (1+pageNumber)];

        //  Draw this page only if some of its bounds overlap the drawing area

        if (! NSIntersectsRect (rect, onePageBounds))

            continue;

        //  Draw by setting the image representation to the correct page,

        //  then having the image representation draw.

        [rep setCurrentPage: pageNumber];

        [rep drawInRect: onePageBounds];

    }

}

//  mouseDown: -- If we have an enclosing scroll-view which knows how to drag,

//  hand the event off to that scroll-view.

- (void) mouseDown:(NSEvent *) theEvent

{

    NSScrollView    *scrollView;

    scrollView = [self enclosingScrollView];

    if ([scrollView respondsToSelector: @selector(dragDocumentWithMouseDown:)])

        [(DraggableScrollView*)scrollView dragDocumentWithMouseDown: theEvent];

    else

        [super mouseDown: theEvent];

}

//  -setFrameSize: -- Override this method to make sure we keep our aspect ratio.

//  This assumes -setFrameSize: is a primitive method (i.e., -setFrame: invokes it)

- (void) setFrameSize: (NSSize) newSize

{

    NSSize  PDFsize;

    float   correctHeight;

    PDFsize = [[self pdfRep] bounds].size;

    correctHeight = [[self pdfRep] pageCount] * (PDFsize.height/PDFsize.width) * newSize.width;

    correctHeight = ceil (correctHeight); // not sure we need this

    //  If the height's almost right, don't fuss with it.

    if (abs (correctHeight - newSize.height) > 3.0)

        newSize.height = correctHeight;

    [super setFrameSize: newSize];

}

#pragma mark PUBLIC INSTANCE METHODS -- NSView OVERRIDES FOR PRINTING

- (BOOL) knowsPageRange: (NSRangePointer) range

{

    range->location = 1;                // page numbers are one-based

    range->length = [[self pdfRep] pageCount];

    return YES;

}

- (NSRect) rectForPage: (int) pageNumber // INPUT: ONE-based page number

{

    NSPDFImageRep   *rep;

    int             pageCount;

    NSRect          result;

    rep = [self pdfRep];

    pageCount = [rep pageCount];

    //  Start at the first page

    result = [rep bounds];

    if (! [self isFlipped])

        result = NSOffsetRect (result, 0.0, (pageCount-1)*result.size.height);

    //  Move to the N'th page

    if ([self isFlipped])

        result = NSOffsetRect (result, 0.0, (pageNumber-1) * result.size.height);

    else

        result = NSOffsetRect (result, 0.0, - (pageNumber-1) * result.size.height);

    return result;

}

@end

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