PDF_Office/PDF Office/PDF Master/Class/PDFTools/Snapshot/Window/KMSnapshotWindowController.swift

//
//  KMSnapshotWindowController.swift
//  PDF Master
//
//  Created by tangchao on 2023/12/12.
//

import Cocoa

class KMSnapshotWindowController: NSWindowController {
    
    /*
     extern NSString *SKSnapshotCurrentSetupKey;

     @class SKSnapshotPDFView, PDFDocument, PDFPage;
     @protocol SKSnapshotWindowControllerDelegate;

     @interface SKSnapshotWindowController : NSWindowController <NSWindowDelegate> {
         SKSnapshotPDFView* pdfView;
         NSImage *thumbnail;
         id <SKSnapshotWindowControllerDelegate> delegate;
         NSString *pageLabel;
         NSImage *windowImage;
         NSString *string;
         BOOL hasWindow;
         BOOL forceOnTop;
         BOOL animating;
     }

     @property (nonatomic, retain) IBOutlet SKSnapshotPDFView *pdfView;
     @property (nonatomic, assign) id <SKSnapshotWindowControllerDelegate> delegate;
     @property (nonatomic, retain) NSImage *thumbnail;
     @property (nonatomic, readonly) NSUInteger pageIndex;
     @property (nonatomic, readonly, copy) NSString *pageLabel;
     @property (nonatomic, copy) NSString *string;
     @property (nonatomic, readonly) BOOL hasWindow;
     @property (nonatomic, readonly) NSDictionary *pageAndWindow;
     @property (nonatomic, readonly) NSDictionary *currentSetup;
     @property (nonatomic) BOOL forceOnTop;

     @property (nonatomic, readonly) NSAttributedString *thumbnailAttachment, *thumbnail512Attachment, *thumbnail256Attachment, *thumbnail128Attachment, *thumbnail64Attachment, *thumbnail32Attachment;

     - (void)setPdfDocument:(PDFDocument *)pdfDocument goToPageNumber:(NSInteger)pageNum rect:(NSRect)rect scaleFactor:(CGFloat)factor autoFits:(BOOL)autoFits;
     - (void)setPdfDocument:(PDFDocument *)pdfDocument setup:(NSDictionary *)setup;

     - (BOOL)isPageVisible:(PDFPage *)page;

     - (void)redisplay;

     - (NSImage *)thumbnailWithSize:(CGFloat)size;

     - (NSAttributedString *)thumbnailAttachmentWithSize:(CGFloat)size;

     - (void)miniaturize;
     - (void)deminiaturize;

     - (void)handlePageChangedNotification:(NSNotification *)notification;
     - (void)handleDocumentDidUnlockNotification:(NSNotification *)notification;
     - (void)handlePDFViewFrameChangedNotification:(NSNotification *)notification;
     - (void)handleViewChangedNotification:(NSNotification *)notification;
     - (void)handleDidAddRemoveAnnotationNotification:(NSNotification *)notification;
     - (void)handleDidMoveAnnotationNotification:(NSNotification *)notification;

     - (void)setNeedsDisplayInRect:(NSRect)rect ofPage:(PDFPage *)page;
     - (void)setNeedsDisplayForAnnotation:(PDFAnnotation *)annotation onPage:(PDFPage *)page;

     @end


     @protocol SKSnapshotWindowControllerDelegate <NSObject>
     @optional

     - (void)snapshotControllerDidFinishSetup:(SKSnapshotWindowController *)controller;
     - (void)snapshotControllerWillClose:(SKSnapshotWindowController *)controller;
     - (void)snapshotControllerDidChange:(SKSnapshotWindowController *)controller;
     - (NSRect)snapshotController:(SKSnapshotWindowController *)controller miniaturizedRect:(BOOL)isMiniaturize;

     @end

     */
    
    /*
     #define EM_DASH_CHARACTER (unichar)0x2014

     #define SMALL_DELAY 0.1
     #define RESIZE_TIME_FACTOR 0.6

     NSString *SKSnapshotCurrentSetupKey = @"currentSetup";

     #define PAGE_KEY            @"page"
     #define RECT_KEY            @"rect"
     #define SCALEFACTOR_KEY     @"scaleFactor"
     #define AUTOFITS_KEY        @"autoFits"
     #define WINDOWFRAME_KEY     @"windowFrame"
     #define HASWINDOW_KEY       @"hasWindow"
     #define PAGELABEL_KEY       @"pageLabel"
     #define PAGEANDWINDOW_KEY   @"pageAndWindow"

     #define SKSnapshotWindowFrameAutosaveName @"SKSnapshotWindow"
     #define SKSnapshotViewChangedNotification @"SKSnapshotViewChangedNotification"

     static char SKSnaphotWindowDefaultsObservationContext;

     @interface SKSnapshotWindowController ()
     @property (nonatomic, copy) NSString *pageLabel;
     @property (nonatomic) BOOL hasWindow;
     @end
     */

    override func windowDidLoad() {
        super.windowDidLoad()
    
        // Implement this method to handle any initialization after your window controller's window has been loaded from its nib file.
    }
    
    /*
     + (NSSet *)keyPathsForValuesAffectingPageAndWindow {
         return [NSSet setWithObjects:PAGELABEL_KEY, HASWINDOW_KEY, nil];
     }

     - (void)dealloc {
         [[NSNotificationCenter defaultCenter] removeObserver: self];
         delegate = nil;
         SKDESTROY(thumbnail);
         SKDESTROY(pageLabel);
         SKDESTROY(pdfView);
         SKDESTROY(windowImage);
         SKDESTROY(string);
         [super dealloc];
     }

     - (NSString *)windowNibName {
         return @"SnapshotWindow";
     }

     - (void)updateWindowLevel {
         BOOL onTop = forceOnTop || [[NSUserDefaults standardUserDefaults] boolForKey:SKSnapshotsOnTopKey];
         [[self window] setLevel:onTop ? NSFloatingWindowLevel : NSNormalWindowLevel];
         [[self window] setHidesOnDeactivate:onTop];
     }

     - (void)windowDidLoad {
         if ([NSWindow instancesRespondToSelector:@selector(setTabbingMode:)])
             [[self window] setTabbingMode:NSWindowTabbingModeDisallowed];
         if ([NSWindow instancesRespondToSelector:@selector(toggleFullScreen:)])
             [[self window] setCollectionBehavior:[[self window] collectionBehavior] | NSWindowCollectionBehaviorFullScreenAuxiliary];
         if ([[self window] respondsToSelector:@selector(contentLayoutRect)]) {
             [[self window] setStyleMask:[[self window] styleMask] | NSFullSizeContentViewWindowMask];
             [pdfView setFrame:[[self window] contentLayoutRect]];
         }
         [self updateWindowLevel];
         [[NSUserDefaultsController sharedUserDefaultsController] addObserver:self forKeys:[NSArray arrayWithObjects:SKSnapshotsOnTopKey, SKShouldAntiAliasKey, SKGreekingThresholdKey, SKBackgroundColorKey, SKPageBackgroundColorKey, nil] context:&SKSnaphotWindowDefaultsObservationContext];
         // the window is initialially exposed. The windowDidExpose notification is useless, it has nothing to do with showing the window
         [self setHasWindow:YES];
     }

     // these should never be reached, but just to be sure

     - (void)windowDidMiniaturize:(NSNotification *)notification {
         [[self window] orderOut:nil];
         [self setHasWindow:NO];
     }

     - (void)windowDidDeminiaturize:(NSNotification *)notification {
         [self updateWindowLevel];
         [self setHasWindow:YES];
     }

     - (NSString *)windowTitleForDocumentDisplayName:(NSString *)displayName {
         return [NSString stringWithFormat:@"%@ %C %@", displayName, EM_DASH_CHARACTER, [NSString stringWithFormat:NSLocalizedString(@"Page %@", @""), [self pageLabel]]];
     }

     - (void)setNeedsDisplayInRect:(NSRect)rect ofPage:(PDFPage *)page {
         NSRect aRect = [pdfView convertRect:rect fromPage:page];
         CGFloat scale = [pdfView scaleFactor];
         CGFloat maxX = ceil(NSMaxX(aRect) + scale);
         CGFloat maxY = ceil(NSMaxY(aRect) + scale);
         CGFloat minX = floor(NSMinX(aRect) - scale);
         CGFloat minY = floor(NSMinY(aRect) - scale);
         
         aRect = NSIntersectionRect([pdfView bounds], NSMakeRect(minX, minY, maxX - minX, maxY - minY));
         if (NSIsEmptyRect(aRect) == NO)
             [pdfView setNeedsDisplayInRect:aRect];
     }

     - (void)setNeedsDisplayForAnnotation:(PDFAnnotation *)annotation onPage:(PDFPage *)page {
         [self setNeedsDisplayInRect:[annotation displayRect] ofPage:page];
     }

     - (void)redisplay {
         [pdfView requiresDisplay];
     }

     - (void)updateString {
         NSMutableString *mutableString = [NSMutableString string];
         NSView *clipView = [[pdfView scrollView] contentView];
         NSRect rect = [clipView convertRect:[clipView visibleRect] toView:pdfView];
         
         for (PDFPage *page in [pdfView displayedPages]) {
             PDFSelection *sel = [page selectionForRect:[pdfView convertRect:rect toPage:page]];
             if ([sel hasCharacters]) {
                 if ([mutableString length] > 0)
                     [mutableString appendString:@"\n"];
                 [mutableString appendString:[sel string]];
             }
         }
         [self setString:mutableString];
     }

     - (void)handlePageChangedNotification:(NSNotification *)notification {
         [self setPageLabel:[[pdfView currentPage] displayLabel]];
         [self handlePDFViewFrameChangedNotification:nil];
     }

     - (void)handleDocumentDidUnlockNotification:(NSNotification *)notification {
         [self setPageLabel:[[pdfView currentPage] displayLabel]];
         [self handlePDFViewFrameChangedNotification:nil];
     }

     - (void)handlePDFViewFrameChangedNotification:(NSNotification *)notification {
         if ([[self delegate] respondsToSelector:@selector(snapshotControllerDidChange:)]) {
             NSNotification *note = [NSNotification notificationWithName:SKSnapshotViewChangedNotification object:self];
             [[NSNotificationQueue defaultQueue] enqueueNotification:note postingStyle:NSPostWhenIdle coalesceMask:NSNotificationCoalescingOnName forModes:nil];
         }
     }

     - (void)handleViewChangedNotification:(NSNotification *)notification {
         [self updateString];
         if ([[self delegate] respondsToSelector:@selector(snapshotControllerDidChange:)])
             [[self delegate] snapshotControllerDidChange:self];
     }

     - (void)handleDidAddRemoveAnnotationNotification:(NSNotification *)notification {
         PDFAnnotation *annotation = [[notification userInfo] objectForKey:SKPDFViewAnnotationKey];
         PDFPage *page = [[notification userInfo] objectForKey:SKPDFViewPageKey];
         if ([[page document] isEqual:[pdfView document]] && [self isPageVisible:page])
             [self setNeedsDisplayForAnnotation:annotation onPage:page];
     }

     - (void)handleDidMoveAnnotationNotification:(NSNotification *)notification {
         PDFAnnotation *annotation = [[notification userInfo] objectForKey:SKPDFViewAnnotationKey];
         PDFPage *oldPage = [[notification userInfo] objectForKey:SKPDFViewOldPageKey];
         PDFPage *newPage = [[notification userInfo] objectForKey:SKPDFViewNewPageKey];
         if ([[newPage document] isEqual:[pdfView document]]) {
             if ([self isPageVisible:oldPage])
                 [self setNeedsDisplayForAnnotation:annotation onPage:oldPage];
             if ([self isPageVisible:newPage])
                 [self setNeedsDisplayForAnnotation:annotation onPage:newPage];
         }
     }

     - (void)windowWillClose:(NSNotification *)notification {
         @try { [[NSUserDefaultsController sharedUserDefaultsController] removeObserver:self forKeys:[NSArray arrayWithObjects:SKSnapshotsOnTopKey, SKShouldAntiAliasKey, SKGreekingThresholdKey, SKBackgroundColorKey, SKPageBackgroundColorKey, nil]]; }
         @catch (id e) {}
         if ([[self delegate] respondsToSelector:@selector(snapshotControllerWillClose:)])
             [[self delegate] snapshotControllerWillClose:self];
         [self setDelegate:nil];
         // Yosemite and El Capitan have a retain cycle when we leave the PDFView with a document
         if (RUNNING_AFTER(10_9) && RUNNING_BEFORE(10_12))
             [pdfView setDocument:nil];
     }

     - (void)notifiyDidFinishSetup {
         [[self delegate] snapshotControllerDidFinishSetup:self];
     }

     - (void)goToRect:(NSValue *)rectValue {
         [pdfView goToRect:[rectValue rectValue] onPage:[pdfView currentPage]];
         [pdfView resetHistory];
         
         [self updateString];
         
         [[self window] makeFirstResponder:pdfView];
         
         [self handlePageChangedNotification:nil];
         
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handlePageChangedNotification:)
                                                      name:PDFViewPageChangedNotification object:pdfView];
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleDocumentDidUnlockNotification:)
                                                      name:PDFDocumentDidUnlockNotification object:[pdfView document]];
         
         NSView *clipView = [[[pdfView documentView] enclosingScrollView] contentView];
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handlePDFViewFrameChangedNotification:)
                                                      name:NSViewFrameDidChangeNotification object:clipView];
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handlePDFViewFrameChangedNotification:)
                                                      name:NSViewBoundsDidChangeNotification object:clipView];
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleViewChangedNotification:)
                                                      name:SKSnapshotViewChangedNotification object:self];
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleDidAddRemoveAnnotationNotification:)
                                                      name:SKPDFViewDidAddAnnotationNotification object:nil];
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleDidAddRemoveAnnotationNotification:)
                                                      name:SKPDFViewDidRemoveAnnotationNotification object:nil];
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleDidMoveAnnotationNotification:)
                                                      name:SKPDFViewDidMoveAnnotationNotification object:nil];
         if ([[self delegate] respondsToSelector:@selector(snapshotControllerDidFinishSetup:)])
             [self performSelector:@selector(notifiyDidFinishSetup) withObject:nil afterDelay:SMALL_DELAY];
         
         if ([self hasWindow])
             [self showWindow:nil];
     }

     - (void)setPdfDocument:(PDFDocument *)pdfDocument goToPageNumber:(NSInteger)pageNum rect:(NSRect)rect scaleFactor:(CGFloat)factor autoFits:(BOOL)autoFits {
         NSWindow *window = [self window];
         
         [pdfView setScaleFactor:factor];
         [pdfView setAutoScales:NO];
         [pdfView setDisplaysPageBreaks:NO];
         [pdfView setDisplayBox:kPDFDisplayBoxCropBox];
         [pdfView setShouldAntiAlias:[[NSUserDefaults standardUserDefaults] floatForKey:SKShouldAntiAliasKey]];
         [pdfView setGreekingThreshold:[[NSUserDefaults standardUserDefaults] floatForKey:SKGreekingThresholdKey]];
         [pdfView setBackgroundColor:[[NSUserDefaults standardUserDefaults] colorForKey:SKBackgroundColorKey]];
         [pdfView applyDefaultPageBackgroundColor];
         [pdfView applyDefaultInterpolationQuality];
         [pdfView setDocument:pdfDocument];
         
         [self setWindowFrameAutosaveNameOrCascade:SKSnapshotWindowFrameAutosaveName];
         
         NSView *controlView = [pdfView scalePopUpButton];
         NSRect controlFrame, frame;
         NSDivideRect([pdfView frame], &controlFrame, &frame, NSHeight([controlView frame]), NSMinYEdge);
         controlFrame.size.width = NSWidth([controlView frame]);
         [controlView setFrame:controlFrame];
         [controlView setAutoresizingMask:NSViewMaxXMargin | NSViewMaxYMargin];
         [[window contentView] addSubview:controlView];
         [pdfView setFrame:frame];
         [window setBackgroundColor:[NSColor colorWithCalibratedWhite:0.97 alpha:1.0]];
         
         PDFPage *page = [pdfDocument pageAtIndex:pageNum];
         frame = [pdfView convertRect:rect fromPage:page];
         frame = [pdfView convertRect:frame toView:nil];
         frame.size.height += NSHeight(controlFrame);
         frame = [NSWindow frameRectForContentRect:frame styleMask:[window styleMask] & ~NSWindowStyleMaskFullSizeContentView];
         frame.origin.x = NSMinX([window frame]);
         frame.origin.y = NSMaxY([window frame]) - NSHeight(frame);
         [[self window] setFrame:NSIntegralRect(frame) display:NO animate:NO];
         
         [pdfView goToPage:page];
         
         if (autoFits)
             [pdfView setAutoFits:autoFits];
         
         // Delayed to allow PDFView to finish its bookkeeping
         // fixes bug of apparently ignoring the point but getting the page right.
         [self performSelector:@selector(goToRect:) withObject:[NSValue valueWithRect:rect] afterDelay:SMALL_DELAY];
     }

     - (void)setPdfDocument:(PDFDocument *)pdfDocument setup:(NSDictionary *)setup {
         [self setPdfDocument:pdfDocument
               goToPageNumber:[[setup objectForKey:PAGE_KEY] unsignedIntegerValue]
                         rect:NSRectFromString([setup objectForKey:RECT_KEY])
                  scaleFactor:[[setup objectForKey:SCALEFACTOR_KEY] doubleValue]
                     autoFits:[[setup objectForKey:AUTOFITS_KEY] boolValue]];
         
         [self setHasWindow:[[setup objectForKey:HASWINDOW_KEY] boolValue]];
         if ([setup objectForKey:WINDOWFRAME_KEY])
             [[self window] setFrame:NSRectFromString([setup objectForKey:WINDOWFRAME_KEY]) display:NO];
     }

     - (BOOL)isPageVisible:(PDFPage *)page {
         return [[page document] isEqual:[pdfView document]] && NSLocationInRange([page pageIndex], [pdfView displayedPageIndexRange]);
     }

     #pragma mark Acessors

     - (NSRect)bounds {
         NSView *clipView = [[[pdfView documentView] enclosingScrollView] contentView];
         return [pdfView convertRect:[pdfView convertRect:[clipView bounds] fromView:clipView] toPage:[pdfView currentPage]];
     }

     - (NSUInteger)pageIndex {
         return [[pdfView currentPage] pageIndex];
     }

     - (void)setPageLabel:(NSString *)newPageLabel {
         if (pageLabel != newPageLabel) {
             [pageLabel release];
             pageLabel = [newPageLabel retain];
             [self synchronizeWindowTitleWithDocumentName];
         }
     }

     - (NSDictionary *)pageAndWindow {
         return [NSDictionary dictionaryWithObjectsAndKeys:[self pageLabel], SKSnapshotPageCellLabelKey, [NSNumber numberWithBool:[self hasWindow]], SKSnapshotPageCellHasWindowKey, nil];
     }

     - (void)setForceOnTop:(BOOL)flag {
         forceOnTop = flag;
         if ([[self window] isVisible])
             [self updateWindowLevel];
     }

     - (NSDictionary *)currentSetup {
         NSView *clipView = [[[pdfView documentView] enclosingScrollView] contentView];
         NSRect rect = [pdfView convertRect:[pdfView convertRect:[clipView bounds] fromView:clipView] toPage:[pdfView currentPage]];
         BOOL autoFits = [pdfView autoFits];
         return [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithUnsignedInteger:[self pageIndex]], PAGE_KEY, NSStringFromRect(rect), RECT_KEY, [NSNumber numberWithDouble:[pdfView scaleFactor]], SCALEFACTOR_KEY, [NSNumber numberWithBool:autoFits], AUTOFITS_KEY, [NSNumber numberWithBool:[[self window] isVisible]], HASWINDOW_KEY, NSStringFromRect([[self window] frame]), WINDOWFRAME_KEY, nil];
     }

     #pragma mark Actions

     - (IBAction)doGoToNextPage:(id)sender {
         [pdfView goToNextPage:sender];
     }

     - (IBAction)doGoToPreviousPage:(id)sender {
         [pdfView goToPreviousPage:sender];
     }

     - (IBAction)doGoToFirstPage:(id)sender {
         [pdfView goToFirstPage:sender];
     }

     - (IBAction)doGoToLastPage:(id)sender {
         [pdfView goToLastPage:sender];
     }

     - (IBAction)doGoBack:(id)sender {
         [pdfView goBack:sender];
     }

     - (IBAction)doGoForward:(id)sender {
         [pdfView goForward:sender];
     }

     - (IBAction)doZoomIn:(id)sender {
         [pdfView zoomIn:sender];
     }

     - (IBAction)doZoomOut:(id)sender {
         [pdfView zoomOut:sender];
     }

     - (IBAction)doZoomToPhysicalSize:(id)sender {
         [pdfView setPhysicalScaleFactor:1.0];
     }

     - (IBAction)doZoomToActualSize:(id)sender {
         [pdfView setScaleFactor:1.0];
     }

     - (IBAction)toggleAutoScale:(id)sender {
         [pdfView setAutoFits:[pdfView autoFits] == NO];
     }

     - (BOOL)validateMenuItem:(NSMenuItem *)menuItem {
         SEL action = [menuItem action];
         if (action == @selector(doGoToNextPage:)) {
             return [pdfView canGoToNextPage];
         } else if (action == @selector(doGoToPreviousPage:)) {
             return [pdfView canGoToPreviousPage];
         } else if (action == @selector(doGoToFirstPage:)) {
             return [pdfView canGoToFirstPage];
         } else if (action == @selector(doGoToLastPage:)) {
             return [pdfView canGoToLastPage];
         } else if (action == @selector(doGoBack:)) {
             return [pdfView canGoBack];
         } else if (action == @selector(doGoForward:)) {
             return [pdfView canGoForward];
         } else if (action == @selector(doZoomIn:)) {
             return [pdfView canZoomIn];
         } else if (action == @selector(doZoomOut:)) {
             return [pdfView canZoomOut];
         } else if (action == @selector(doZoomToActualSize:)) {
             return fabs([pdfView scaleFactor] - 1.0 ) > 0.01;
         } else if (action == @selector(doZoomToPhysicalSize:)) {
             return fabs([pdfView physicalScaleFactor] - 1.0 ) > 0.01;
         } else if (action == @selector(toggleAutoScale:)) {
             [menuItem setState:[pdfView autoFits] ? NSOnState : NSOffState];
             return YES;
         }
         return YES;
     }

     #pragma mark Thumbnails

     - (NSImage *)thumbnailWithSize:(CGFloat)size {
         NSView *clipView = [[[pdfView documentView] enclosingScrollView] contentView];
         NSRect bounds = [pdfView convertRect:[clipView bounds] fromView:clipView];
         if (CGRectEqualToRect(CGRectZero, bounds) || CGRectIsNull(bounds)) {
             return nil;
         }
         NSBitmapImageRep *imageRep = [pdfView bitmapImageRepForCachingDisplayInRect:bounds];
         NSAffineTransform *transform = nil;
         NSSize thumbnailSize = bounds.size;
         CGFloat shadowBlurRadius = 0.0;
         CGFloat shadowOffset = 0.0;
         NSImage *image;
         
         [pdfView cacheDisplayInRect:bounds toBitmapImageRep:imageRep];
         
         bounds.origin = NSZeroPoint;
         
         if (size > 0.0) {
             shadowBlurRadius = round(size / 32.0);
             shadowOffset = -ceil(shadowBlurRadius * 0.75);
             if (NSHeight(bounds) > NSWidth(bounds))
                 thumbnailSize = NSMakeSize(round((size - 2.0 * shadowBlurRadius) * NSWidth(bounds) / NSHeight(bounds) + 2.0 * shadowBlurRadius), size);
             else
                 thumbnailSize = NSMakeSize(size, round((size - 2.0 * shadowBlurRadius) * NSHeight(bounds) / NSWidth(bounds) + 2.0 * shadowBlurRadius));
             transform = [NSAffineTransform transform];
             [transform translateXBy:shadowBlurRadius yBy:shadowBlurRadius - shadowOffset];
             [transform scaleXBy:(thumbnailSize.width - 2.0 * shadowBlurRadius) / NSWidth(bounds) yBy:(thumbnailSize.height - 2.0 * shadowBlurRadius) / NSHeight(bounds)];
         }
         
         if (CGSizeEqualToSize(CGSizeZero, thumbnailSize)) {
             return nil;
         }
         image = [[[NSImage alloc] initWithSize:thumbnailSize] autorelease];
         
         if (CGSizeEqualToSize(CGSizeZero, image.size)) {
             return nil;
         }
         [image lockFocus];
         [[NSGraphicsContext currentContext] setImageInterpolation:NSImageInterpolationHigh];
         [transform concat];
         [NSGraphicsContext saveGraphicsState];
         [[PDFView defaultPageBackgroundColor] set];
         if (shadowBlurRadius > 0.0)
             [NSShadow setShadowWithColor:[NSColor colorWithCalibratedWhite:0.0 alpha:0.5] blurRadius:shadowBlurRadius yOffset:shadowOffset];
         NSRectFill(bounds);
         [[NSGraphicsContext currentContext] setImageInterpolation:NSImageInterpolationDefault];
         [NSGraphicsContext restoreGraphicsState];
         [imageRep drawInRect:bounds];
         [image unlockFocus];
         
         return image;
     }

     - (NSAttributedString *)thumbnailAttachmentWithSize:(CGFloat)size {
         NSImage *image = [self thumbnailWithSize:size];
         
         NSFileWrapper *wrapper = [[NSFileWrapper alloc] initRegularFileWithContents:[image TIFFRepresentation]];
         NSString *filename = [NSString stringWithFormat:@"snapshot_page_%lu.tiff",(unsigned long)( [self pageIndex] + 1)];
         [wrapper setFilename:filename];
         [wrapper setPreferredFilename:filename];

         NSTextAttachment *attachment = [[NSTextAttachment alloc] initWithFileWrapper:wrapper];
         [wrapper release];
         NSAttributedString *attrString = [NSAttributedString attributedStringWithAttachment:attachment];
         [attachment release];
         
         return attrString;
     }

     - (NSAttributedString *)thumbnailAttachment {
         return [self thumbnailAttachmentWithSize:0.0];
     }

     - (NSAttributedString *)thumbnail512Attachment {
         return [self thumbnailAttachmentWithSize:512.0];
     }

     - (NSAttributedString *)thumbnail256Attachment {
         return [self thumbnailAttachmentWithSize:256.0];
     }

     - (NSAttributedString *)thumbnail128Attachment {
         return [self thumbnailAttachmentWithSize:128.0];
     }

     - (NSAttributedString *)thumbnail64Attachment {
         return [self thumbnailAttachmentWithSize:64.0];
     }

     - (NSAttributedString *)thumbnail32Attachment {
         return [self thumbnailAttachmentWithSize:32.0];
     }

     #pragma mark Miniaturize / Deminiaturize

     - (NSRect)miniaturizedRectForDockingRect:(NSRect)dockRect {
         NSView *clipView = [[[pdfView documentView] enclosingScrollView] contentView];
         NSRect sourceRect = [clipView convertRect:[clipView bounds] toView:nil];
         NSRect targetRect;
         NSSize windowSize = [[self window] frame].size;
         NSSize thumbSize = [thumbnail size];
         CGFloat thumbRatio = thumbSize.height / thumbSize.width;
         CGFloat dockRatio = NSHeight(dockRect) / NSWidth(dockRect);
         CGFloat scaleFactor;
         CGFloat shadowRadius = round(fmax(thumbSize.width, thumbSize.height) / 32.0);
         CGFloat shadowOffset = ceil(0.75 * shadowRadius);
         
         if (thumbRatio > dockRatio) {
             targetRect = NSInsetRect(dockRect, 0.5 * NSWidth(dockRect) * (1.0 - dockRatio / thumbRatio), 0.0);
             scaleFactor = NSHeight(targetRect) / thumbSize.height;
         } else {
             targetRect = NSInsetRect(dockRect, 0.0, 0.5 * NSHeight(dockRect) * (1.0 - thumbRatio / dockRatio));
             scaleFactor = NSWidth(targetRect) / thumbSize.width;
         }
         shadowRadius *= scaleFactor;
         shadowOffset *= scaleFactor;
         targetRect = NSOffsetRect(NSInsetRect(targetRect, shadowRadius, shadowRadius), 0.0, shadowOffset);
         scaleFactor = thumbRatio > dockRatio ? NSHeight(targetRect) / NSHeight(sourceRect) : NSWidth(targetRect) / NSWidth(sourceRect);
         
         return NSMakeRect(NSMinX(targetRect) - scaleFactor * NSMinX(sourceRect), NSMinY(targetRect) - scaleFactor * NSMinY(sourceRect), scaleFactor * windowSize.width, scaleFactor * windowSize.height);
     }

     - (void)miniaturizeWindowFromRect:(NSRect)startRect toRect:(NSRect)endRect {
         if (windowImage == nil)
             windowImage = [[(SKSnapshotWindow *)[self window] windowImage] retain];
         
         SKAnimatedBorderlessWindow *miniaturizeWindow = [[SKAnimatedBorderlessWindow alloc] initWithContentRect:startRect];
         [miniaturizeWindow setLevel:NSFloatingWindowLevel];
         [miniaturizeWindow setBackgroundImage:windowImage];
         
         [miniaturizeWindow orderFront:nil];
         
         animating = YES;
         
         [NSAnimationContext runAnimationGroup:^(NSAnimationContext *context){
                 [context setDuration:RESIZE_TIME_FACTOR * [miniaturizeWindow animationResizeTime:endRect]];
                 [[miniaturizeWindow animator] setFrame:endRect display:YES];
             }
             completionHandler:^{
                 if ([self hasWindow]) {
                     if ([[self window] respondsToSelector:@selector(setAnimationBehavior:)])
                         [[self window] setAnimationBehavior:NSWindowAnimationBehaviorNone];
                     [[self window] orderFront:nil];
                     [self updateWindowLevel];
                     if ([[self window] respondsToSelector:@selector(setAnimationBehavior:)])
                         [[self window] setAnimationBehavior:NSWindowAnimationBehaviorDefault];
                 }
                 [miniaturizeWindow orderOut:nil];
                 animating = NO;
         }];
         
         [miniaturizeWindow release];
     }

     - (void)miniaturize {
         if (animating)
             return;
         if ([[self delegate] respondsToSelector:@selector(snapshotController:miniaturizedRect:)]) {
             NSRect dockRect = [[self delegate] snapshotController:self miniaturizedRect:YES];
             NSRect startRect = [[self window] frame];
             NSRect endRect = [self miniaturizedRectForDockingRect:dockRect];
             
             [self miniaturizeWindowFromRect:startRect toRect:endRect];
             
             if ([[self window] respondsToSelector:@selector(setAnimationBehavior:)])
                 [[self window] setAnimationBehavior:NSWindowAnimationBehaviorNone];
         }
         [[self window] orderOut:nil];
         if ([[self window] respondsToSelector:@selector(setAnimationBehavior:)])
             [[self window] setAnimationBehavior:NSWindowAnimationBehaviorDefault];
         [self setHasWindow:NO];
     }

     - (void)deminiaturize {
         if (animating)
             return;
         if ([[self delegate] respondsToSelector:@selector(snapshotController:miniaturizedRect:)]) {
             NSRect dockRect = [[self delegate] snapshotController:self miniaturizedRect:NO];
             NSRect endRect = [[self window] frame];
             NSRect startRect = [self miniaturizedRectForDockingRect:dockRect];
             
             [self miniaturizeWindowFromRect:startRect toRect:endRect];
             
             SKDESTROY(windowImage);
         } else {
             [self showWindow:self];
         }
         [self setHasWindow:YES];
     }

     #pragma mark KVO

     - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
         if (context == &SKSnaphotWindowDefaultsObservationContext) {
             NSString *key = [keyPath substringFromIndex:7];
             if ([key isEqualToString:SKSnapshotsOnTopKey]) {
                 if ([[self window] isVisible])
                     [self updateWindowLevel];
             } else if ([key isEqualToString:SKShouldAntiAliasKey]) {
                 [pdfView setShouldAntiAlias:[[NSUserDefaults standardUserDefaults] boolForKey:SKShouldAntiAliasKey]];
                 [pdfView applyDefaultInterpolationQuality];
             } else if ([key isEqualToString:SKGreekingThresholdKey]) {
                 [pdfView setGreekingThreshold:[[NSUserDefaults standardUserDefaults] floatForKey:SKGreekingThresholdKey]];
             } else if ([key isEqualToString:SKBackgroundColorKey]) {
                 [pdfView setBackgroundColor:[[NSUserDefaults standardUserDefaults] colorForKey:SKBackgroundColorKey]];
             } else if ([key isEqualToString:SKPageBackgroundColorKey]) {
                 [pdfView applyDefaultPageBackgroundColor];
             }
         } else {
             [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
         }
     }
     */

}