Theme Editor: auto-reload .properties files on window activation, if modified outside

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatThemeEditorPane.java

@@ -19,13 +19,17 @@ package com.formdev.flatlaf.themeeditor;
 import java.awt.BorderLayout;
 import java.awt.Color;
 import java.awt.Font;
+import java.awt.Window;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
 import java.util.List;
+import javax.swing.JFrame;
 import javax.swing.JLayer;
+import javax.swing.JOptionPane;
 import javax.swing.JPanel;
+import javax.swing.SwingUtilities;
 import org.fife.ui.autocomplete.AutoCompletion;
 import org.fife.ui.autocomplete.CompletionProvider;
 import org.fife.ui.rsyntaxtextarea.AbstractTokenMakerFactory;
@@ -124,8 +128,40 @@ class FlatThemeEditorPane
 		textArea.load( loc, StandardCharsets.ISO_8859_1 );
 	}
 
-	void save() throws IOException {
+	void reloadIfNecessary() {
+		if( textArea.isModifiedOutsideEditor() ) {
+			if( textArea.isDirty() ) {
+				if( JOptionPane.showConfirmDialog( this,
+					"The file '" + textArea.getFileName()
+					+ "' has been changed. Replace the editor contents with these changes?",
+					getWindowTitle(), JOptionPane.YES_NO_OPTION ) != JOptionPane.YES_OPTION )
+				{
+					textArea.syncLastSaveOrLoadTimeToActualFile();
+					return;
+				}
+			}
+
+			try {
+				textArea.reload();
+			} catch( IOException ex ) {
+				JOptionPane.showMessageDialog( this,
+					"Failed to reload '" + textArea.getFileName() + "'\n\nReason: " + ex.getMessage(),
+					getWindowTitle(), JOptionPane.WARNING_MESSAGE );
+			}
+		}
+	}
+
+	boolean saveIfDirty() {
+		try {
+			if( textArea.isDirty() )
 				textArea.save();
+			return true;
+		} catch( IOException ex ) {
+			JOptionPane.showMessageDialog( this,
+				"Failed to save '" + textArea.getFileName() + "'\n\nReason: " + ex.getMessage(),
+				getWindowTitle(), JOptionPane.WARNING_MESSAGE );
+			return false;
+		}
 	}
 
 	String getFileName() {
@@ -135,4 +171,9 @@ class FlatThemeEditorPane
 	boolean isDirty() {
 		return textArea.isDirty();
 	}
+
+	private String getWindowTitle() {
+		Window window = SwingUtilities.windowForComponent( this );
+		return (window instanceof JFrame) ? ((JFrame)window).getTitle() : null;
+	}
 }

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatThemeFileEditor.java

@@ -110,16 +110,9 @@ public class FlatThemeFileEditor
 
 	private boolean saveAll() {
 		for( FlatThemeEditorPane themeEditorPane : getThemeEditorPanes() ) {
-			try {
-				if( themeEditorPane.isDirty() )
-					themeEditorPane.save();
-			} catch( IOException ex ) {
-				JOptionPane.showMessageDialog( this,
-					"Failed to save '" + themeEditorPane.getFileName() + "'\n\nReason: " + ex.getMessage(),
-					getTitle(), JOptionPane.WARNING_MESSAGE );
+			if( !themeEditorPane.saveIfDirty() )
 				return false;
 		}
-		}
 		return true;
 	}
 
@@ -132,6 +125,11 @@ public class FlatThemeFileEditor
 		exit();
 	}
 
+	private void windowActivated() {
+		for( FlatThemeEditorPane themeEditorPane : getThemeEditorPanes() )
+			themeEditorPane.reloadIfNecessary();
+	}
+
 	private void windowDeactivated() {
 		saveAll();
 	}
@@ -158,6 +156,10 @@ public class FlatThemeFileEditor
 		setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
 		setTitle("FlatLaf Theme Editor");
 		addWindowListener(new WindowAdapter() {
+			@Override
+			public void windowActivated(WindowEvent e) {
+				FlatThemeFileEditor.this.windowActivated();
+			}
 			@Override
 			public void windowClosing(WindowEvent e) {
 				FlatThemeFileEditor.this.windowClosing();

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatThemeFileEditor.jfd

@@ -11,6 +11,7 @@ new FormModel {
 			"title": "FlatLaf Theme Editor"
 			addEvent( new FormEvent( "java.awt.event.WindowListener", "windowClosing", "windowClosing", false ) )
 			addEvent( new FormEvent( "java.awt.event.WindowListener", "windowDeactivated", "windowDeactivated", false ) )
+			addEvent( new FormEvent( "java.awt.event.WindowListener", "windowActivated", "windowActivated", false ) )
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$layoutConstraints": "hidemode 3"
 				"$columnConstraints": "[fill][grow,fill]"