Re: Creating a jpeg and or gif for drag and drop.

FROM : Fabio Lossotti
DATE : Thu Nov 21 07:15:01 2002

You've got almost everything you need, just pull a JPEG or GIF instead
of a TIFF.  Here are some code snippets that should help.

To get the JPEG image:
    NSBitmapImageRep    *imageRep = [NSBitmapImageRep
imageRepWithData:[image TIFFRepresentationUsingCompression:
NSTIFFCompressionLZW factor: 15.0]];
    NSData *jpgData = [imageRep representationUsingType:NSJPEGFileType
properties:nil];
  (then write the data to the pasteboard)

And for GIFs:
    NSBitmapImageRep    *imageRep = [NSBitmapImageRep
imageRepWithData:[image TIFFRepresentationUsingCompression:
NSTIFFCompressionLZW factor: 15.0]];
    NSData *gifData = [imageRep
      representationUsingType:NSGIFFileType properties:nil];
  (then write the data to the pasteboard)

-FL



--- Timothy Paustian <<email_removed>> wrote:
> I have a view that has several graphics in it. From this I want to be
>
> able to allows users to drag out a jpeg and/or gif to other parts of
> the application or even to other applications. I have this working
> for tiffs and here is the code I use. (Note I know the command key
> thing is a bit non-standard, but it works for what I am trying to do.
>
> How can I modify this code to get me a jpeg or gif?
>
> - (void)mouseDown:(NSEvent *)theEvent
> {
>      NSSize dragOffset = NSMakeSize(0.0, 0.0);
>      NSPasteboard *pboard;
>      unsigned int modifiers = [theEvent modifierFlags];
>   
>      if(modifiers & NSCommandKeyMask)
>      {
>     NSRect    bounds = [self bounds];
>     NSImage *image = [[[NSImage alloc] initWithSize: bounds.size]
> autorelease];
>     NSImage *dragImage = [[[NSImage alloc] initWithSize:
> bounds.size] autorelease];
>     NSPoint    dragPoint = NSMakePoint(0.0, 0.0);
>
>     pboard = [NSPasteboard pasteboardWithName:NSDragPboard];
>     [pboard declareTypes:[NSArray
> arrayWithObject:NSTIFFPboardType] owner:self];
>
>     [image lockFocus];
>     [self drawRect:bounds];
>     [image unlockFocus];
>
>     [pboard setData: [image TIFFRepresentationUsingCompression:
> NSTIFFCompressionLZW factor: 15.0]            forType:
> NSTIFFPboardType];
>
>     [dragImage setBackgroundColor:[NSColor clearColor]];
>     [dragImage lockFocus];
>     [image dissolveToPoint: dragPoint fraction: 0.5];
>     [dragImage unlockFocus];
>
>     [self dragImage:dragImage
>         at:bounds.origin
>         offset: dragOffset
>         event:theEvent
>         pasteboard:pboard
>         source:self slideBack:YES];
>      }
>      else
>      {
>     [super mouseDown:theEvent];
>      }
>      return;
> }
>
> --
> Cheers,
> Tim
>
> Timothy Paustian
> UW-Madison, Bacteriology



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