System File Chooser: support "approve" callback and system message dialog on macOS (not yet used in SystemFileChooser

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

@@ -59,7 +59,7 @@ public class FlatSystemFileChooserMacTest
 			}
 
 			FlatTestFrame frame = FlatTestFrame.create( args, "FlatSystemFileChooserMacTest" );
-			addListeners( frame );
+//			addListeners( frame );
 			frame.showFrame( FlatSystemFileChooserMacTest::new );
 		} );
 	}
@@ -133,11 +133,24 @@ public class FlatSystemFileChooserMacTest
 		}
 		int fileTypeIndex = fileTypeIndexSlider.getValue();
 
+		FlatNativeMacLibrary.FileChooserCallback callback = (files, hwndFileDialog) -> {
+			System.out.println( "  -- callback " + hwndFileDialog + "  " + Arrays.toString( files ) );
+			if( showMessageDialogOnOKCheckBox.isSelected() ) {
+				int result = FlatNativeMacLibrary.showMessageDialog( hwndFileDialog,
+					JOptionPane.INFORMATION_MESSAGE,
+					"primary text", "secondary text", 0, "Yes", "No" );
+				System.out.println( "     result   " + result );
+				if( result != 0 )
+					return false;
+			}
+			return true;
+		};
+
 		if( direct ) {
 			String[] files = FlatNativeMacLibrary.showFileChooser( open,
 				title, prompt, message, filterFieldLabel,
 				nameFieldLabel, nameFieldStringValue, directoryURL,
-				optionsSet.get(), optionsClear.get(), fileTypeIndex, fileTypes );
+				optionsSet.get(), optionsClear.get(), callback, fileTypeIndex, fileTypes );
 
 			filesField.setText( (files != null) ? Arrays.toString( files ).replace( ',', '\n' ) : "null" );
 		} else {
@@ -148,7 +161,7 @@ public class FlatSystemFileChooserMacTest
 				String[] files = FlatNativeMacLibrary.showFileChooser( open,
 					title, prompt, message, filterFieldLabel,
 					nameFieldLabel, nameFieldStringValue, directoryURL,
-					optionsSet.get(), optionsClear.get(), fileTypeIndex, fileTypes2 );
+					optionsSet.get(), optionsClear.get(), callback, fileTypeIndex, fileTypes2 );
 
 				System.out.println( "    secondaryLoop.exit() returned " + secondaryLoop.exit() );
 
@@ -173,6 +186,7 @@ public class FlatSystemFileChooserMacTest
 			optionsClear.set( optionsClear.get() | option );
 	}
 
+	@SuppressWarnings( "unused" )
 	private static void addListeners( Window w ) {
 		w.addWindowListener( new WindowListener() {
 			@Override
@@ -270,6 +284,7 @@ public class FlatSystemFileChooserMacTest
 		saveButton = new JButton();
 		openDirectButton = new JButton();
 		saveDirectButton = new JButton();
+		showMessageDialogOnOKCheckBox = new JCheckBox();
 		filesScrollPane = new JScrollPane();
 		filesField = new JTextArea();
 
@@ -468,6 +483,10 @@ public class FlatSystemFileChooserMacTest
 		saveDirectButton.addActionListener(e -> saveDirect());
 		add(saveDirectButton, "cell 0 10 3 1");
 
+		//---- showMessageDialogOnOKCheckBox ----
+		showMessageDialogOnOKCheckBox.setText("show message dialog on OK");
+		add(showMessageDialogOnOKCheckBox, "cell 0 10 3 1");
+
 		//======== filesScrollPane ========
 		{
 
@@ -519,6 +538,7 @@ public class FlatSystemFileChooserMacTest
 	private JButton saveButton;
 	private JButton openDirectButton;
 	private JButton saveDirectButton;
+	private JCheckBox showMessageDialogOnOKCheckBox;
 	private JScrollPane filesScrollPane;
 	private JTextArea filesField;
 	// JFormDesigner - End of variables declaration  //GEN-END:variables

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

@@ -257,6 +257,12 @@ new FormModel {
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 0 10 3 1"
 			} )
+			add( new FormComponent( "javax.swing.JCheckBox" ) {
+				name: "showMessageDialogOnOKCheckBox"
+				"text": "show message dialog on OK"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 10 3 1"
+			} )
 			add( new FormContainer( "javax.swing.JScrollPane", new FormLayoutManager( class javax.swing.JScrollPane ) ) {
 				name: "filesScrollPane"
 				add( new FormComponent( "javax.swing.JTextArea" ) {