[platform-swt-dev] Mac OS 10.4 Finder drag and drop development

[Eric Zimmerman <eric@xxxxxxxxxxx>]

Drag and Drop to and from the finder in Mac OS 10.4 does not work 
(Already submitted as a bug).  I have spent the last couple of days 
working on a fix but, I seem to be stuck.

I have fixed the drop source capabilities within eclipse by adding type 
'furl' to the FileTransfer Class and implementing the correct 
nativeToJava switch to do the processing: (Following the guidelines 
here: http://developer.apple.com/technotes/tn/tn2022.html)

if (transferData.type == FURLID) {
           int encoding = OS.CFStringGetSystemEncoding();
           int count = transferData.data.length;
           String[] fileNames = new String[count];
           for (int i = 0; i < count; i++) {
               System.out.println("url: " + new 
String(transferData.data[i]));
               byte[] urlData = transferData.data[i];
               int url = 
OS.CFURLCreateWithBytes(OS.kCFAllocatorDefault, urlData, urlData.length, 
encoding, 0);
               if (url == 0) return null;
               try {
                   int path = OS.CFURLCopyFileSystemPath(url, 
OS.kCFURLPOSIXPathStyle);
                   if (path == 0) return null;
                   try {
                       int length = OS.CFStringGetLength(path);
                       if (length == 0) return null;
                       char[] buffer = new char[length];
                       CFRange range = new CFRange();
                       range.length = length;
                       OS.CFStringGetCharacters(path, range, buffer);
                       fileNames[i] = new String(buffer);
                       System.out.println("filename: " + fileNames[i]);
                   } finally {
                       OS.CFRelease(path);
                   }
               } finally {
                   OS.CFRelease(url);
               }
           }
           return fileNames;
       }

I had to wrap the CFURLCreateWithBytes native method into the swt-pi 
library in order to accomplish this.

I then figured the issue with drag out was probably the reciprical 
problem so I implemented the javaToNative furl processing:

if (transferData.type == FURLID) {
           System.out.println("Requesting furlid transfer");
           byte[][] data = new byte[files.length][];
           for (int i = 0; i < data.length; i++) {
               File file = new File(files[i]);
               boolean isDirectory = file.isDirectory();
               String fileName = files[i];
               char[] chars = new char[fileName.length()];
               fileName.getChars(0, chars.length, chars, 0);
               int cfstring = 
OS.CFStringCreateWithCharacters(OS.kCFAllocatorDefault, chars, 
chars.length);
               if (cfstring == 0) return;
               try {
                   int url = 
OS.CFURLCreateWithFileSystemPath(OS.kCFAllocatorDefault, cfstring, 
OS.kCFURLPOSIXPathStyle, isDirectory);
                   if (url == 0) return;
                   try {
                       int encoding = OS.CFStringGetSystemEncoding();
                       int theData = 
OS.CFURLCreateData(OS.kCFAllocatorDefault, url, encoding, true);
                       if(theData == 0) return;
                       try {
                           int length = OS.CFDataGetLength(theData);
                           byte[] buffer = new byte[length];
                           CFRange range = new CFRange();
                           range.length = length;
                           OS.CFDataGetBytes(theData, range, buffer);
                           System.out.println("FURL: " + new 
String(buffer));
                           data[i] = buffer;
                       } finally {
                           OS.CFRelease(theData);
                       }
                   } finally {
                       OS.CFRelease(url);
                   }
               } finally {
                   OS.CFRelease(cfstring);
               }
           }
           transferData.data = data;
           transferData.result = 0;
       }

To do this I also needed to wrap CFURLCreateData, CFDataGetLength, and 
CFDataGetBytes in the swt-pi library.  This code seems to function 
correctly as a dragflavor since it is accepted by most applications 
other than the finder.

Whenever I attempt to drag from my application in the finder I get a 
positive result back from the trackDrag method that should indicate the 
finder accepted my drag, but nothing shows up in the finder. :-(

I believe I have done most of the work to make this happen but am just 
missing a little step to finish it off.  If anybody can give me some 
advice on where to look or something to try I will submit all of my 
wrappers and code that are developed.

Thanks,

Eric