ftp.nice.ch/pub/next/audio/apps/Patchmix.NIHS.bs.tar.gz#/Patchmix/Source/TransparentWindow.h

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// TransparentWindow.h
// By Jayson Adams, NeXT Developer Support Team
// You may freely copy, distribute and reuse the code in this example.
// NeXT disclaims any warranty of any kind, expressed or implied, as to its
// fitness for any particular use.

#import <dpsclient/event.h>
#import <objc/Object.h>

@interface TransparentWindow:Object
{
    id		image, source, previousWindowUnderMouse, animator;
    NXSize	windowSize;
    int		iWindow, bgWindow, niWindow, gWindow, igstate, bggstate,
    		nigstate, imageGstate, ggstate, previousWindowNumUnderMouse,
		frames;
    NXPoint	increment, currentPoint, stoppingPoint, mouseOffset;
}

/* instance methods */
- initForImage:anImage at:(NXPoint *)windowOrigin forView:anObject;
- free;
- image;
- dragFromMouseDown:(NXPoint *)startingPoint mouseOffset:(NXPoint *)offset;
- checkForAcceptWindow:(int)windowNumUnderMouse atPoint:(NXPoint *)point
  :(int *)windowUnderMouseChanged :(int *)previousWindowUnderMouseChanged;

@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.