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Using java.awt.FileDialog

Posted on 1998-05-14
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Last Modified: 2008-02-01
I am using jdk1.1.5 and I want to use the java.awt.FileDialog.
I want the FileDialog to only show directories and not any of the files in those directories.  Is this possible?  If so, how can I accomplish this?
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Question by:stepma
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Expert Comment

by:froderik
ID: 1221008
It is possible to show only the directories since you can set a FilenameFilter for your FileDialog object that accepts directories but not files. The user can't pick directories in the FileDialog however which, I guess, is what you want to do.

If you need details about the FilenameFilter implementation I can give you such.
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Author Comment

by:stepma
ID: 1221009
I do need details about the FilenameFilter...
could you show me an implementation of a FilenameFilter as you described above where it will only show directories, and also how to hook it into FileDialog?
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Expert Comment

by:froderik
ID: 1221010
The easiest way is to let your controlling Frame class implement the FilenameFilter. (Adding the words implements FilenameFilter at the class declaration.) Then you have to implement the method accept which in your case would look like this:
boolean accept(File dir, String file)
{
  File someFile = new File( dir, file );
  return someFile.isDirectory();
}

Then somewhere near the creation of your FileDialog you will have to send the setFilenameFilter method to the FileDialog. Like this:
FileDialog fd = new FileDialog( this );
fd.setFilenameFilter( this );
fd.show();

That's about it.

If you would like to place the implementation of FilenameFilter somewhere else you'll have to use such an object as the argument to setFilenameFilter().

Clear enough?
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Author Comment

by:stepma
ID: 1221011
I did this suggestion and it does not work, when I open the FileDialog, I still see files, not just directories...is there something else that I have to do?
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Expert Comment

by:froderik
ID: 1221012
Hi,

I tried them myself as well and it doesn't seem to work at all to connect a FilenameFilter to a FileDialog. (Have never used this feature myself.) The described way definitely is the way to do it according to documentation available to me. ("Java in a nutshell" and JDK API doc online.) I have used filters with the list method in File though and it works fine all the time.

I will investigate the matter further and I suggest that you reopen the question to other experts in the meantime. Maybe someone already knows about a workaround.
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Expert Comment

by:evijay
ID: 1221013
Hi,

When i reverse engineered the FileDialogPeer source from jdk1.1.6 kit, i found that the method setFilenameFilter is left empty !!.

Vijay

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Expert Comment

by:evijay
ID: 1221014
Hi,

When i reverse engineered the FileDialogPeer source from jdk1.1.6 kit, i found that the method setFilenameFilter is left empty  for both solaris and windows implementation !!.

Vijay

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Expert Comment

by:froderik
ID: 1221015
Which means that the API documentation for FileDialog is erroneous. Too bad.
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Expert Comment

by:webster030697
ID: 1221016
Yes, I seem to remember that the FilenameFilter was left unimplememnted because it couldn't be done in a platform independant way.
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Author Comment

by:stepma
ID: 1221017
Oh well, I guess I am out of luck!!
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Expert Comment

by:froderik
ID: 1221018
Unfortunately, but it shouldn't be that hard to implement a better FileDialog wit the desired functionality if you have plenty of time. Such an implementation could offer the possibility to actually pick directories as well. Some combination of List, TextField and Button on a Panel would do it.

Good luck anyway! :)
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Expert Comment

by:evijay
ID: 1221019
Can you increase the points for i have one implemented by me.


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Accepted Solution

by:
evijay earned 100 total points
ID: 1221020
Use the JFileChooser of swing -1.0.1. it is in com.sun.java.swing.preview package. You can set the file type using
setChoosableFileType(FileType.SharedFolder) and restrict the display. If you are still out of luck, try to change the swing
JFileChooser code (DirectoryModel.java) and see that it gets only files of your choice (directory). Actually, you can implement directory model yourself to see that you will allow it to display directories only.

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Author Comment

by:stepma
ID: 1221021
evijay, Can I see your source code now...
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Expert Comment

by:evijay
ID: 1221022
Did you go thru the jfilechooser component of swing.
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