System File Chooser: implemented modality for GtkFileChooserDialog on Linux

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatNativeLinuxLibrary.java

@@ -138,9 +138,10 @@ public class FlatNativeLinuxLibrary
 	 * the file dialog. It is highly recommended to invoke it from a new thread
 	 * to avoid blocking the AWT event dispatching thread.
 	 *
+	 * @param owner the owner of the file dialog; or {@code null}
 	 * @param open if {@code true}, shows the open dialog; if {@code false}, shows the save dialog
 	 * @param title text displayed in dialog title; or {@code null}
-	 * @param okButtonLabel text displayed in default button; or {@code null}
+	 * @param okButtonLabel text displayed in default button; or {@code null}. Use '_' for mnemonics (e.g. "_Choose")
 	 * @param currentName user-editable filename currently shown in the filename field in save dialog; or {@code null}
 	 * @param currentFolder current directory shown in the dialog; or {@code null}
 	 * @param optionsSet options to set; see {@code FOS_*} constants
@@ -156,7 +157,7 @@ public class FlatNativeLinuxLibrary
 	 *
 	 * @since 3.6
 	 */
-	public native static String[] showFileChooser( boolean open,
+	public native static String[] showFileChooser( Window owner, boolean open,
 		String title, String okButtonLabel, String currentName, String currentFolder,
 		int optionsSet, int optionsClear, int fileTypeIndex, String... fileTypes );
 }

flatlaf-natives/flatlaf-natives-linux/src/main/cpp/GtkFileChooser.cpp

@@ -26,6 +26,9 @@
  * @since 3.6
  */
 
+// see X11WmUtils.cpp
+Window getWindowHandle( JNIEnv* env, JAWT* awt, jobject window, Display** display_return );
+
 //---- class AutoReleaseStringUTF8 --------------------------------------------
 
 class AutoReleaseStringUTF8 {
@@ -86,10 +89,65 @@ void initFilters( GtkFileChooser* chooser, JNIEnv* env, jint fileTypeIndex, jobj
 	}
 }
 
+GdkWindow* getGdkWindow( JNIEnv* env, jobject window ) {
+	// get the AWT
+	JAWT awt;
+	awt.version = JAWT_VERSION_1_4;
+	if( !JAWT_GetAWT( env, &awt ) )
+		return NULL;
+
+	// get Xlib window and display from AWT window
+	Display* display;
+	Window w = getWindowHandle( env, &awt, window, &display );
+	if( w == 0 )
+		return NULL;
+
+	// based on GetAllocNativeWindowHandle() from https://github.com/btzy/nativefiledialog-extended
+	// https://github.com/btzy/nativefiledialog-extended/blob/29e3bcb578345b9fa345d1d7683f00c150565ca3/src/nfd_gtk.cpp#L384-L437
+	GdkDisplay* gdkDisplay = gdk_x11_lookup_xdisplay( display );
+	if( gdkDisplay == NULL ) {
+		// search for existing X11 display (there should only be one, even if multiple screens are connected)
+		GdkDisplayManager* displayManager = gdk_display_manager_get();
+		GSList* displays = gdk_display_manager_list_displays( displayManager );
+		for( GSList* l = displays; l; l = l->next ) {
+			if( GDK_IS_X11_DISPLAY( l->data ) ) {
+				gdkDisplay = GDK_DISPLAY( l->data );
+				break;
+			}
+		}
+		g_slist_free( displays );
+
+		// create our own X11 display
+		if( gdkDisplay == NULL ) {
+			gdk_set_allowed_backends( "x11" );
+			gdkDisplay = gdk_display_manager_open_display( displayManager, NULL );
+			gdk_set_allowed_backends( NULL );
+
+			if( gdkDisplay == NULL )
+				return NULL;
+		}
+	}
+
+	return gdk_x11_window_foreign_new_for_display( gdkDisplay, w );
+}
+
+static void handle_realize( GtkWidget* dialog, gpointer data ) {
+	GdkWindow* gdkOwner = static_cast<GdkWindow*>( data );
+
+	// make file dialog a transient of owner window,
+	// which centers file dialog on owner and keeps file dialog above owner
+	gdk_window_set_transient_for( gtk_widget_get_window( dialog ), gdkOwner );
+
+	// necessary because gdk_x11_window_foreign_new_for_display() increases the reference counter
+	g_object_unref( gdkOwner );
+}
+
 static void handle_response( GtkWidget* dialog, gint responseId, gpointer data ) {
+	// get filenames if user pressed OK
 	if( responseId == GTK_RESPONSE_ACCEPT )
 		*((GSList**)data) = gtk_file_chooser_get_filenames( GTK_FILE_CHOOSER( dialog ) );
 
+	// hide/destroy file dialog and quit loop
 	gtk_widget_hide( dialog );
 	gtk_widget_destroy( dialog );
 	gtk_main_quit();
@@ -99,7 +157,7 @@ static void handle_response( GtkWidget* dialog, gint responseId, gpointer data )
 
 extern "C"
 JNIEXPORT jobjectArray JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_showFileChooser
-	( JNIEnv* env, jclass cls, jboolean open,
+	( JNIEnv* env, jclass cls, jobject owner, jboolean open,
 		jstring title, jstring okButtonLabel, jstring currentName, jstring currentFolder,
 		jint optionsSet, jint optionsClear, jint fileTypeIndex, jobjectArray fileTypes )
 {
@@ -129,11 +187,13 @@ JNIEXPORT jobjectArray JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrar
 		NULL ); // marks end of buttons
 	GtkFileChooser* chooser = GTK_FILE_CHOOSER( dialog );
 
+	// set current name and folder
 	if( !open && ccurrentName != NULL )
 		gtk_file_chooser_set_current_name( chooser, ccurrentName );
 	if( ccurrentFolder != NULL )
 		gtk_file_chooser_set_current_folder( chooser, ccurrentFolder );
 
+	// set options
 	if( isOptionSetOrClear( FC_select_multiple ) )
 		gtk_file_chooser_set_select_multiple( chooser, isOptionSet( FC_select_multiple ) );
 	if( isOptionSetOrClear( FC_show_hidden ) )
@@ -145,15 +205,39 @@ JNIEXPORT jobjectArray JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrar
 	if( isOptionSetOrClear( FC_create_folders ) )
 		gtk_file_chooser_set_create_folders( chooser, isOptionSet( FC_create_folders ) );
 
+	// initialize filter
 	initFilters( chooser, env, fileTypeIndex, fileTypes );
 
-	gtk_window_set_modal( GTK_WINDOW( dialog ), true );
+	// setup modality
+	GdkWindow* gdkOwner = (owner != NULL) ? getGdkWindow( env, owner ) : NULL;
+	if( gdkOwner != NULL ) {
+		gtk_window_set_modal( GTK_WINDOW( dialog ), true );
+
+		// file dialog should use same screen as owner
+		gtk_window_set_screen( GTK_WINDOW( dialog ), gdk_window_get_screen( gdkOwner ) );
+
+		// set the transient when the file dialog is realized
+		g_signal_connect( dialog, "realize", G_CALLBACK( handle_realize ), gdkOwner );
+	}
 
 	// show dialog
 	// (similar to what's done in sun_awt_X11_GtkFileDialogPeer.c)
 	GSList* fileList = NULL;
-    g_signal_connect( dialog, "response", G_CALLBACK( handle_response ), &fileList );
+	g_signal_connect( dialog, "response", G_CALLBACK( handle_response ), &fileList );
 	gtk_widget_show( dialog );
+
+	// necessary to bring file dialog to the front (and make it active)
+	// see issues:
+	//     https://github.com/btzy/nativefiledialog-extended/issues/31
+	//     https://github.com/mlabbe/nativefiledialog/pull/92
+	//     https://github.com/guillaumechereau/noc/pull/11
+	if( GDK_IS_X11_DISPLAY( gtk_widget_get_display( GTK_WIDGET( dialog ) ) ) ) {
+		GdkWindow* gdkWindow = gtk_widget_get_window( GTK_WIDGET( dialog ) );
+		gdk_window_set_events( gdkWindow, static_cast<GdkEventMask>( gdk_window_get_events( gdkWindow ) | GDK_PROPERTY_CHANGE_MASK ) );
+		gtk_window_present_with_time( GTK_WINDOW( dialog ), gdk_x11_get_server_time( gdkWindow ) );
+	}
+
+	// start event loop (will be quit in respone handler)
 	gtk_main();
 
 	// canceled?

flatlaf-natives/flatlaf-natives-linux/src/main/headers/com_formdev_flatlaf_ui_FlatNativeLinuxLibrary.h

@@ -40,10 +40,10 @@ JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_xS
 /*
  * Class:     com_formdev_flatlaf_ui_FlatNativeLinuxLibrary
  * Method:    showFileChooser
- * Signature: (ZLjava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;III[Ljava/lang/String;)[Ljava/lang/String;
+ * Signature: (Ljava/awt/Window;ZLjava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;III[Ljava/lang/String;)[Ljava/lang/String;
  */
 JNIEXPORT jobjectArray JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLinuxLibrary_showFileChooser
-  (JNIEnv *, jclass, jboolean, jstring, jstring, jstring, jstring, jint, jint, jint, jobjectArray);
+  (JNIEnv *, jclass, jobject, jboolean, jstring, jstring, jstring, jstring, jint, jint, jint, jobjectArray);
 
 #ifdef __cplusplus
 }

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatSystemFileChooserLinuxTest.java

@@ -17,10 +17,12 @@
 package com.formdev.flatlaf.testing;
 
 import static com.formdev.flatlaf.ui.FlatNativeLinuxLibrary.*;
+import java.awt.Dialog;
 import java.awt.EventQueue;
 import java.awt.SecondaryLoop;
 import java.awt.Toolkit;
 import java.awt.Window;
+import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
 import java.awt.event.WindowFocusListener;
 import java.awt.event.WindowListener;
@@ -75,6 +77,26 @@ public class FlatSystemFileChooserLinuxTest
 	}
 
 	private void openOrSave( boolean open, boolean direct ) {
+		Window frame = SwingUtilities.windowForComponent( this );
+		if( ownerFrameRadioButton.isSelected() )
+			openOrSave( open, direct, frame );
+		else if( ownerDialogRadioButton.isSelected() ) {
+			JDialog dialog = new JDialog( frame, "Dummy Modal Dialog", Dialog.DEFAULT_MODALITY_TYPE );
+			dialog.setDefaultCloseOperation( JDialog.DISPOSE_ON_CLOSE );
+			dialog.addWindowListener( new WindowAdapter() {
+				@Override
+				public void windowOpened( WindowEvent e ) {
+					openOrSave( open, direct, dialog );
+				}
+			} );
+			dialog.setSize( 1200, 1000 );
+			dialog.setLocationRelativeTo( this );
+			dialog.setVisible( true );
+		} else
+			openOrSave( open, direct, null );
+	}
+
+	private void openOrSave( boolean open, boolean direct, Window owner ) {
 		String title = n( titleField.getText() );
 		String okButtonLabel = n( okButtonLabelField.getText() );
 		String currentName = n( currentNameField.getText() );
@@ -103,7 +125,7 @@ public class FlatSystemFileChooserLinuxTest
 		int fileTypeIndex = fileTypeIndexSlider.getValue();
 
 		if( direct ) {
-			String[] files = FlatNativeLinuxLibrary.showFileChooser( open,
+			String[] files = FlatNativeLinuxLibrary.showFileChooser( owner, open,
 				title, okButtonLabel, currentName, currentFolder,
 				optionsSet.get(), optionsClear.get(), fileTypeIndex, fileTypes );
 
@@ -113,7 +135,7 @@ public class FlatSystemFileChooserLinuxTest
 
 			String[] fileTypes2 = fileTypes;
 			new Thread( () -> {
-				String[] files = FlatNativeLinuxLibrary.showFileChooser( open,
+				String[] files = FlatNativeLinuxLibrary.showFileChooser( owner, open,
 					title, okButtonLabel, currentName, currentFolder,
 					optionsSet.get(), optionsClear.get(), fileTypeIndex, fileTypes2 );
 
@@ -198,6 +220,11 @@ public class FlatSystemFileChooserLinuxTest
 
 	private void initComponents() {
 		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
+		ownerLabel = new JLabel();
+		ownerFrameRadioButton = new JRadioButton();
+		ownerDialogRadioButton = new JRadioButton();
+		ownerNullRadioButton = new JRadioButton();
+		ownerSpacer = new JPanel(null);
 		titleLabel = new JLabel();
 		titleField = new JTextField();
 		panel1 = new JPanel();
@@ -239,12 +266,31 @@ public class FlatSystemFileChooserLinuxTest
 			"[]" +
 			"[]" +
 			"[]" +
+			"[]" +
 			"[grow,fill]"));
 
+		//---- ownerLabel ----
+		ownerLabel.setText("owner");
+		add(ownerLabel, "cell 0 0");
+
+		//---- ownerFrameRadioButton ----
+		ownerFrameRadioButton.setText("JFrame");
+		ownerFrameRadioButton.setSelected(true);
+		add(ownerFrameRadioButton, "cell 1 0");
+
+		//---- ownerDialogRadioButton ----
+		ownerDialogRadioButton.setText("JDialog");
+		add(ownerDialogRadioButton, "cell 1 0");
+
+		//---- ownerNullRadioButton ----
+		ownerNullRadioButton.setText("null");
+		add(ownerNullRadioButton, "cell 1 0");
+		add(ownerSpacer, "cell 1 0,growx");
+
 		//---- titleLabel ----
 		titleLabel.setText("title");
-		add(titleLabel, "cell 0 0");
+		add(titleLabel, "cell 0 1");
-		add(titleField, "cell 1 0");
+		add(titleField, "cell 1 1");
 
 		//======== panel1 ========
 		{
@@ -288,26 +334,26 @@ public class FlatSystemFileChooserLinuxTest
 			local_onlyCheckBox.setText("local_only");
 			panel1.add(local_onlyCheckBox, "cell 0 5");
 		}
-		add(panel1, "cell 2 0 1 6,aligny top,growy 0");
+		add(panel1, "cell 2 1 1 6,aligny top,growy 0");
 
 		//---- okButtonLabelLabel ----
 		okButtonLabelLabel.setText("okButtonLabel");
-		add(okButtonLabelLabel, "cell 0 1");
+		add(okButtonLabelLabel, "cell 0 2");
-		add(okButtonLabelField, "cell 1 1");
+		add(okButtonLabelField, "cell 1 2");
 
 		//---- currentNameLabel ----
 		currentNameLabel.setText("currentName");
-		add(currentNameLabel, "cell 0 2");
+		add(currentNameLabel, "cell 0 3");
-		add(currentNameField, "cell 1 2");
+		add(currentNameField, "cell 1 3");
 
 		//---- currentFolderLabel ----
 		currentFolderLabel.setText("currentFolder");
-		add(currentFolderLabel, "cell 0 3");
+		add(currentFolderLabel, "cell 0 4");
-		add(currentFolderField, "cell 1 3");
+		add(currentFolderField, "cell 1 4");
 
 		//---- fileTypesLabel ----
 		fileTypesLabel.setText("fileTypes");
-		add(fileTypesLabel, "cell 0 4");
+		add(fileTypesLabel, "cell 0 5");
 
 		//---- fileTypesField ----
 		fileTypesField.setEditable(true);
@@ -317,11 +363,11 @@ public class FlatSystemFileChooserLinuxTest
 			"Text Files,*.txt,null,PDF Files,*.pdf,null,All Files,*,null",
 			"Text and PDF Files,*.txt,*.pdf,null"
 		}));
-		add(fileTypesField, "cell 1 4");
+		add(fileTypesField, "cell 1 5");
 
 		//---- fileTypeIndexLabel ----
 		fileTypeIndexLabel.setText("fileTypeIndex");
-		add(fileTypeIndexLabel, "cell 0 5");
+		add(fileTypeIndexLabel, "cell 0 6");
 
 		//---- fileTypeIndexSlider ----
 		fileTypeIndexSlider.setMaximum(10);
@@ -329,27 +375,27 @@ public class FlatSystemFileChooserLinuxTest
 		fileTypeIndexSlider.setValue(0);
 		fileTypeIndexSlider.setPaintLabels(true);
 		fileTypeIndexSlider.setSnapToTicks(true);
-		add(fileTypeIndexSlider, "cell 1 5");
+		add(fileTypeIndexSlider, "cell 1 6");
 
 		//---- openButton ----
 		openButton.setText("Open...");
 		openButton.addActionListener(e -> open());
-		add(openButton, "cell 0 6 3 1");
+		add(openButton, "cell 0 7 3 1");
 
 		//---- saveButton ----
 		saveButton.setText("Save...");
 		saveButton.addActionListener(e -> save());
-		add(saveButton, "cell 0 6 3 1");
+		add(saveButton, "cell 0 7 3 1");
 
 		//---- openDirectButton ----
 		openDirectButton.setText("Open (no-thread)...");
 		openDirectButton.addActionListener(e -> openDirect());
-		add(openDirectButton, "cell 0 6 3 1");
+		add(openDirectButton, "cell 0 7 3 1");
 
 		//---- saveDirectButton ----
 		saveDirectButton.setText("Save (no-thread)...");
 		saveDirectButton.addActionListener(e -> saveDirect());
-		add(saveDirectButton, "cell 0 6 3 1");
+		add(saveDirectButton, "cell 0 7 3 1");
 
 		//======== filesScrollPane ========
 		{
@@ -358,11 +404,22 @@ public class FlatSystemFileChooserLinuxTest
 			filesField.setRows(8);
 			filesScrollPane.setViewportView(filesField);
 		}
-		add(filesScrollPane, "cell 0 7 3 1,growx");
+		add(filesScrollPane, "cell 0 8 3 1,growx");
+
+		//---- ownerButtonGroup ----
+		ButtonGroup ownerButtonGroup = new ButtonGroup();
+		ownerButtonGroup.add(ownerFrameRadioButton);
+		ownerButtonGroup.add(ownerDialogRadioButton);
+		ownerButtonGroup.add(ownerNullRadioButton);
 		// JFormDesigner - End of component initialization  //GEN-END:initComponents
 	}
 
 	// JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
+	private JLabel ownerLabel;
+	private JRadioButton ownerFrameRadioButton;
+	private JRadioButton ownerDialogRadioButton;
+	private JRadioButton ownerNullRadioButton;
+	private JPanel ownerSpacer;
 	private JLabel titleLabel;
 	private JTextField titleField;
 	private JPanel panel1;

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatSystemFileChooserLinuxTest.jfd

@@ -6,19 +6,52 @@ new FormModel {
 		add( new FormContainer( "com.formdev.flatlaf.testing.FlatTestPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 			"$layoutConstraints": "ltr,insets dialog,hidemode 3"
 			"$columnConstraints": "[left][grow,fill][fill]"
-			"$rowConstraints": "[][][][][][][][grow,fill]"
+			"$rowConstraints": "[][][][][][][][][grow,fill]"
 		} ) {
 			name: "this"
+			add( new FormComponent( "javax.swing.JLabel" ) {
+				name: "ownerLabel"
+				"text": "owner"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerFrameRadioButton"
+				"text": "JFrame"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+				"selected": true
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerDialogRadioButton"
+				"text": "JDialog"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JRadioButton" ) {
+				name: "ownerNullRadioButton"
+				"text": "null"
+				"$buttonGroup": new FormReference( "ownerButtonGroup" )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "com.jformdesigner.designer.wrapper.HSpacer" ) {
+				name: "ownerSpacer"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0,growx"
+			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "titleLabel"
 				"text": "title"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 0"
+				"value": "cell 0 1"
 			} )
 			add( new FormComponent( "javax.swing.JTextField" ) {
 				name: "titleField"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 1 0"
+				"value": "cell 1 1"
 			} )
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$layoutConstraints": "insets 2,hidemode 3"
@@ -67,46 +100,46 @@ new FormModel {
 					"value": "cell 0 5"
 				} )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 2 0 1 6,aligny top,growy 0"
+				"value": "cell 2 1 1 6,aligny top,growy 0"
 			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "okButtonLabelLabel"
 				"text": "okButtonLabel"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 1"
+				"value": "cell 0 2"
 			} )
 			add( new FormComponent( "javax.swing.JTextField" ) {
 				name: "okButtonLabelField"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 1 1"
+				"value": "cell 1 2"
 			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "currentNameLabel"
 				"text": "currentName"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 2"
+				"value": "cell 0 3"
 			} )
 			add( new FormComponent( "javax.swing.JTextField" ) {
 				name: "currentNameField"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 1 2"
+				"value": "cell 1 3"
 			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "currentFolderLabel"
 				"text": "currentFolder"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 3"
+				"value": "cell 0 4"
 			} )
 			add( new FormComponent( "javax.swing.JTextField" ) {
 				name: "currentFolderField"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 1 3"
+				"value": "cell 1 4"
 			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "fileTypesLabel"
 				"text": "fileTypes"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 4"
+				"value": "cell 0 5"
 			} )
 			add( new FormComponent( "javax.swing.JComboBox" ) {
 				name: "fileTypesField"
@@ -119,13 +152,13 @@ new FormModel {
 					addElement( "Text and PDF Files,*.txt,*.pdf,null" )
 				}
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 1 4"
+				"value": "cell 1 5"
 			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "fileTypeIndexLabel"
 				"text": "fileTypeIndex"
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 5"
+				"value": "cell 0 6"
 			} )
 			add( new FormComponent( "javax.swing.JSlider" ) {
 				name: "fileTypeIndexSlider"
@@ -135,35 +168,35 @@ new FormModel {
 				"paintLabels": true
 				"snapToTicks": true
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 1 5"
+				"value": "cell 1 6"
 			} )
 			add( new FormComponent( "javax.swing.JButton" ) {
 				name: "openButton"
 				"text": "Open..."
 				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "open", false ) )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 6 3 1"
+				"value": "cell 0 7 3 1"
 			} )
 			add( new FormComponent( "javax.swing.JButton" ) {
 				name: "saveButton"
 				"text": "Save..."
 				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "save", false ) )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 6 3 1"
+				"value": "cell 0 7 3 1"
 			} )
 			add( new FormComponent( "javax.swing.JButton" ) {
 				name: "openDirectButton"
 				"text": "Open (no-thread)..."
 				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "openDirect", false ) )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 6 3 1"
+				"value": "cell 0 7 3 1"
 			} )
 			add( new FormComponent( "javax.swing.JButton" ) {
 				name: "saveDirectButton"
 				"text": "Save (no-thread)..."
 				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "saveDirect", false ) )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 6 3 1"
+				"value": "cell 0 7 3 1"
 			} )
 			add( new FormContainer( "javax.swing.JScrollPane", new FormLayoutManager( class javax.swing.JScrollPane ) ) {
 				name: "filesScrollPane"
@@ -172,11 +205,16 @@ new FormModel {
 					"rows": 8
 				} )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 0 7 3 1,growx"
+				"value": "cell 0 8 3 1,growx"
 			} )
 		}, new FormLayoutConstraints( null ) {
 			"location": new java.awt.Point( 0, 0 )
 			"size": new java.awt.Dimension( 690, 630 )
 		} )
+		add( new FormNonVisual( "javax.swing.ButtonGroup" ) {
+			name: "ownerButtonGroup"
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 0, 640 )
+		} )
 	}
 }