Refactored stuff.

src/org/chrisle/netbeans/plugins/nbscratchfile/CreateScratchFile.java

@@ -1,10 +1,14 @@
 package org.chrisle.netbeans.plugins.nbscratchfile;
 
+import org.chrisle.netbeans.plugins.nbscratchfile.model.NbScratchFileViewModel;
 import java.awt.Component;
+import java.awt.Dimension;
 import java.awt.KeyboardFocusManager;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.KeyEvent;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowFocusListener;
 import javafx.application.Platform;
 import javafx.beans.value.ObservableValue;
 import javafx.concurrent.Worker.State;
@@ -15,6 +19,7 @@
 import javax.swing.JComponent;
 import javax.swing.JDialog;
 import javax.swing.KeyStroke;
+import javax.swing.SwingUtilities;
 import netscape.javascript.JSObject;
 import org.openide.awt.ActionID;
 import org.openide.awt.ActionReference;
@@ -54,6 +59,19 @@ public CreateScratchFile() {
         dialog.setResizable(false);
         dialog.setAlwaysOnTop(true);
         dialog.setUndecorated(true);
+        dialog.addWindowFocusListener(new WindowFocusListener() {
+            @Override
+            public void windowGainedFocus(WindowEvent e) {}
+
+            @Override
+            public void windowLostFocus(WindowEvent e) {
+                if (SwingUtilities.isDescendingFrom(e.getOppositeWindow(), dialog)) {
+                    return;
+                }
+
+                dialog.setVisible(false);
+            }
+        });
 
         dialog.getRootPane().registerKeyboardAction((ActionEvent e1) -> {
             dialog.setVisible(false);
@@ -75,7 +93,7 @@ public void actionPerformed(ActionEvent e) {
             });
 
             try {
-                webEngine.load(CreateScratchFile.class.getResource("/org/chrisle/netbeans/plugins/nbscratchfile/components/filetypewindow/ui/index.html").toExternalForm());
+                webEngine.load(CreateScratchFile.class.getResource("/org/chrisle/netbeans/plugins/nbscratchfile/components/filetypewindow/dist/index.html").toExternalForm());
             } catch (Exception ex) {
                 Exceptions.printStackTrace(ex);
             }

src/org/chrisle/netbeans/plugins/nbscratchfile/model/NbScratchFileViewModel.java

@@ -0,0 +1,44 @@
+package org.chrisle.netbeans.plugins.nbscratchfile.model;
+
+import java.io.IOException;
+import java.nio.file.FileAlreadyExistsException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import javax.swing.JDialog;
+import javax.swing.JOptionPane;
+import org.netbeans.api.actions.Openable;
+import org.openide.filesystems.FileObject;
+import org.openide.filesystems.FileUtil;
+import org.openide.loaders.DataObject;
+import org.openide.util.Exceptions;
+
+public class NbScratchFileViewModel {
+    private int counter = 1;
+    private final JDialog dialog;
+
+    public NbScratchFileViewModel(JDialog dialog) {
+        this.dialog = dialog;
+    }
+
+    public void setExt(String ext, String languageName) {
+        try {
+            Path path = Paths.get(String.format("%s/.netbeans/scratches/%s/scratch%d.%s", System.getProperty("user.home"), languageName, this.counter++, ext));
+            Files.createDirectories(path.getParent());
+            Files.createFile(path);
+
+            FileObject fo = FileUtil.toFileObject(FileUtil.normalizeFile(path.toFile()));
+            DataObject dataObject = DataObject.find(fo);
+            Openable openable = dataObject.getLookup().lookup(Openable.class);
+
+            dialog.setVisible(false);
+            openable.open();
+        } catch (FileAlreadyExistsException e) {
+            this.setExt(ext, languageName);
+            System.err.println("already exists: " + e.getMessage());
+        } catch (IOException ex) {
+            JOptionPane.showMessageDialog(null, ex.getMessage());
+            Exceptions.printStackTrace(ex);
+        }
+    }
+}