Re: Changing the default file filter in

Hi Matvei,

This may be the only way to do that, I think.

Gj

On 13-7-2016 22:10, matvei.stefarov wrote:
> I am creating a NetBeans-Platform-based "viewer" application that supports several custom file formats. I'm wondering if it's possible to change the default "Open File..." dialog to select a filter other than "All Files" by default.
>
> Here is the code that builds the FileChooser: http://hg.netbeans.org/main/file/c7b8745b5c39/utilities/src/org/netbeans/modules/openfile/OpenFileAction.java#l103
>
> I found a workaround that sets OpenFileAction.currentFileFilter field via reflection, but it feels very fragile and hacky:
>
>
> Code:
> import java.lang.reflect.Field;
> import java.util.Arrays;
> import javax.swing.filechooser.FileFilter;
> import org.openide.filesystems.*;
> import org.openide.modules.ModuleInstall;
> import org.openide.util.Exceptions;
> import org.openide.util.Lookup;
>
> public class Installer extends ModuleInstall {
>
>    @Override
>    public void restored() {
>      // Sets the default file filter of "Open File" dialog to "PDF Documents", instead of "All Files"
>      try {
>        // Find the description of the FileFilter generated for PdfDataObject
>        FileChooserBuilder fcb = new FileChooserBuilder(Installer.class);
>        fcb.addDefaultFileFilters();
>        FileFilter filter = Arrays.stream(fcb.createFileChooser().getChoosableFileFilters())
>            .filter(f -> f.getDescription().contains("pdf"))
>            .findFirst()
>            .get();
>        String pdfFilterDescription = filter.getDescription();
>
>        // Set the currentFileFilter field of the OpenFileAction class
>        ClassLoader gcl = Lookup.getDefault().lookup(ClassLoader.class);
>        Class<?> ofaClass = gcl.loadClass("org.netbeans.modules.openfile.OpenFileAction");
>        Field cffField = ofaClass.getDeclaredField("currentFileFilter");
>        cffField.setAccessible(true);
>        cffField.set(null, pdfFilterDescription);
>
>      } catch (Exception ex) {
>        Exceptions.printStackTrace(ex);
>      }
>    }
> }
>
>
>
>
> Unfortunately I cannot find any sensible way to extend OpenFileAction without reflection.  Can anyone think of a better way to accomplish this behavior?
>
>
>
>