#import "ImageDiffController.h"

#import "NSImageDifference.h"

@implementation ImageDiffController

    // These methods will get invoked if you drop an image on either NSImageView at the top of the window.

- (IBAction)leftImageChanged:(id)sender { [self updateDiffImage]; }

- (IBAction)rightImageChanged:(id)sender { [self updateDiffImage]; }

- (void) updateDiffImage

    {

    [differenceImageView setImage:[[leftImageView image] differenceFromImage:[rightImageView image]]];

    [[leftImageView cell] setHighlighted:NO];  // For some reason, when you drag an image into an NSImageView, it gets selected.  

    [[rightImageView cell] setHighlighted:NO];

    }

- (IBAction) saveDiffImage:sender

  {

  [[NSSavePanel savePanel]

    beginSheetForDirectory:NSHomeDirectory()  // Seems like a reasonable place to start..

    file:@"DiffImage"   // default filename

    modalForWindow:window   //Run as a sheet, attached to "window"

    modalDelegate:self  // The save panel should call me when it's done..

    didEndSelector:@selector(savePanelDidEnd:returnCode:contextInfo:) // ... using this selector

    contextInfo:NULL];

  }

- (void)savePanelDidEnd:(NSSavePanel *)sheet returnCode:(int)returnCode contextInfo:(void  *)contextInfo

  {

  if (returnCode == NSOKButton)  // The user hit "save", so...

    [[[differenceImageView image] TIFFRepresentation]  // Create the contents of a .tiff file

      writeToFile:[[sheet filename] stringByAppendingString: @".tiff"] // save it at the path we get from the panel.

      atomically:YES];  // That's about all there is to it..

  }

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication { return YES; }

@end

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