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

[Veronika Irvine <Veronika_Irvine@xxxxxxxxxx>]

You might want to check out this thread in the eclipse.platform.swt 
newsgroup:

"OS X Drag&Drop to Finder / InDesign" from Wolfgang Werner

http://dev.eclipse.org/newslists/news.eclipse.platform.swt/msg18484.html




Eric Zimmerman <eric@xxxxxxxxxxx> 
Sent by: platform-swt-dev-bounces@xxxxxxxxxxx
05/16/2005 08:02 PM
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Subject
[platform-swt-dev] Mac OS 10.4 Finder drag and drop development






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
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