SystemFileChooser: File name filter for tar.gz files

[A-Herzog]

In FlatLaf 3.7 FileNameExtensionFilter for the new SystemFileChooser does not allow "." as part of a file name extension. See lines 1471 and 1472 in

FlatLaf/flatlaf-core/src/main/java/com/formdev/flatlaf/util/SystemFileChooser.java

Line 1471 in 7680c3a

if( extension.indexOf( '.' ) >= 0 || extension.indexOf( '*' ) >= 0 )

For being able to filter files of type tar.gz it would be helpful, if a dot was allowed in the extension. The corresponding Swing class javax.swing.filechooser.FileNameExtensionFilter for javax.swing.JFileChooser does not prohibit extensions to contain dots.

[DevCharly]

The problem is that not all system file dialogs support this kind of filter.
E.g. on macOS, a tar.gz filter does not work.

Anyway, I think I'll add support for some kind of "platform specific" filters that offer more platform specific features...

[A-Herzog]

Thank you very much. I only have Windows and Linux systems. So I do not know how exactly MacOS behaves. But again, the FileNameExtensionFilter class from the JDK only checks:

if (extensions[i] == null || extensions[i].length() == 0) {
    throw new IllegalArgumentException("Each extension must be non-null and not empty");
}

So allowing "." would be more aligned with JFileChooser.

[DevCharly]

Good news 😄

Have added PatternFilter, which support glob file filter (e.g. *.tar.gz) on Windows and on Linux, but not on macOS.

Sample:

chooser.addChoosableFileFilter( new PatternFilter( "Compressed TAR", "*.tar.gz" ) );

macOS system file dialog does not support glob file filter.
So if using PatternFilter on macOS, the Swing file chooser JFileChooser is shown instead of macOS file dialog and a warning is logged. To avoid this, do not use PatternFilter` on macOS.

E.g.:

if( SystemInfo.isMacOS )
    chooser.addChoosableFileFilter( new FileNameExtensionFilter( "Compressed TAR", "tgz" ) );
else
    chooser.addChoosableFileFilter( new PatternFilter( "Compressed TAR", "*.tar.gz" ) );
} );

see PR #1079