Demo/Testing: use IntelliJ Theme Laf classes (from package com.formdev.flatlaf.intellijthemes) in Demo and Testing apps instead of directly loading .theme.json (preparation for #824)

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DemoPrefs.java

@@ -28,7 +28,6 @@ import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.FlatLightLaf;
 import com.formdev.flatlaf.FlatPropertiesLaf;
 import com.formdev.flatlaf.IntelliJTheme;
-import com.formdev.flatlaf.demo.intellijthemes.IJThemesPanel;
 import com.formdev.flatlaf.util.LoggingFacade;
 import com.formdev.flatlaf.util.StringUtils;
 import com.formdev.flatlaf.util.SystemInfo;
@@ -38,15 +37,10 @@ import com.formdev.flatlaf.util.SystemInfo;
  */
 public class DemoPrefs
 {
-	public static final String KEY_LAF = "laf";
+	public static final String KEY_LAF_CLASS_NAME = "lafClassName";
-	public static final String KEY_LAF_THEME = "lafTheme";
+	public static final String KEY_LAF_THEME_FILE = "lafThemeFile";
 	public static final String KEY_SYSTEM_SCALE_FACTOR = "systemScaleFactor";
 
-	public static final String RESOURCE_PREFIX = "res:";
-	public static final String FILE_PREFIX = "file:";
-
-	public static final String THEME_UI_KEY = "__FlatLaf.demo.theme";
-
 	private static Preferences state;
 
 	public static Preferences getState() {
@@ -63,29 +57,21 @@ public class DemoPrefs
 			if( args.length > 0 )
 				UIManager.setLookAndFeel( args[0] );
 			else {
-				String lafClassName = state.get( KEY_LAF, FlatLightLaf.class.getName() );
+				String lafClassName = state.get( KEY_LAF_CLASS_NAME, FlatLightLaf.class.getName() );
-				if( IntelliJTheme.ThemeLaf.class.getName().equals( lafClassName ) ) {
+				if( FlatPropertiesLaf.class.getName().equals( lafClassName ) ||
-					String theme = state.get( KEY_LAF_THEME, "" );
+					IntelliJTheme.ThemeLaf.class.getName().equals( lafClassName ) )
-					if( theme.startsWith( RESOURCE_PREFIX ) )
+				{
-						IntelliJTheme.setup( IJThemesPanel.class.getResourceAsStream( IJThemesPanel.THEMES_PACKAGE + theme.substring( RESOURCE_PREFIX.length() ) ) );
+					String themeFileName = state.get( KEY_LAF_THEME_FILE, "" );
-					else if( theme.startsWith( FILE_PREFIX ) )
+					if( !themeFileName.isEmpty() ) {
-					    FlatLaf.setup( IntelliJTheme.createLaf( new FileInputStream( theme.substring( FILE_PREFIX.length() ) ) ) );
+						File themeFile = new File( themeFileName );
-					else
-						FlatLightLaf.setup();
 
-					if( !theme.isEmpty() )
+						if( themeFileName.endsWith( ".properties" ) ) {
-						UIManager.getLookAndFeelDefaults().put( THEME_UI_KEY, theme );
+							String themeName = StringUtils.removeTrailing( themeFile.getName(), ".properties" );
-				} else if( FlatPropertiesLaf.class.getName().equals( lafClassName ) ) {
+							FlatLaf.setup( new FlatPropertiesLaf( themeName, themeFile ) );
-					String theme = state.get( KEY_LAF_THEME, "" );
+						} else
-					if( theme.startsWith( FILE_PREFIX ) ) {
+							FlatLaf.setup( IntelliJTheme.createLaf( new FileInputStream( themeFile ) ) );
-						File themeFile = new File( theme.substring( FILE_PREFIX.length() ) );
-						String themeName = StringUtils.removeTrailing( themeFile.getName(), ".properties" );
-						FlatLaf.setup( new FlatPropertiesLaf( themeName, themeFile ) );
 					} else
 						FlatLightLaf.setup();
-
-					if( !theme.isEmpty() )
-						UIManager.getLookAndFeelDefaults().put( THEME_UI_KEY, theme );
 				} else
 					UIManager.setLookAndFeel( lafClassName );
 			}
@@ -99,7 +85,7 @@ public class DemoPrefs
 		// remember active look and feel
 		UIManager.addPropertyChangeListener( e -> {
 			if( "lookAndFeel".equals( e.getPropertyName() ) )
-				state.put( KEY_LAF, UIManager.getLookAndFeel().getClass().getName() );
+				state.put( KEY_LAF_CLASS_NAME, UIManager.getLookAndFeel().getClass().getName() );
 		} );
 	}
 

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/intellijthemes/IJThemesManager.java

@@ -58,6 +58,7 @@ class IJThemesManager
 			String name = value.get( "name" );
 			boolean discontinued = Boolean.parseBoolean( value.get( "discontinued" ) );
 			boolean dark = Boolean.parseBoolean( value.get( "dark" ) );
+			String lafClassName = value.get( "lafClassName" );
 			String license = value.get( "license" );
 			String licenseFile = value.get( "licenseFile" );
 			String pluginUrl = value.get( "pluginUrl" );
@@ -65,7 +66,7 @@ class IJThemesManager
 			String sourceCodePath = value.get( "sourceCodePath" );
 
 			bundledThemes.add( new IJThemeInfo( name, resourceName, discontinued, dark,
-				license, licenseFile, pluginUrl, sourceCodeUrl, sourceCodePath, null, null ) );
+				license, licenseFile, pluginUrl, sourceCodeUrl, sourceCodePath, null, lafClassName ) );
 		}
 	}
 

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/intellijthemes/IJThemesPanel.java

@@ -33,8 +33,6 @@ import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
-import java.nio.file.Files;
-import java.nio.file.StandardCopyOption;
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.HashMap;
@@ -59,7 +57,6 @@ import com.formdev.flatlaf.extras.FlatSVGIcon;
 import com.formdev.flatlaf.themes.*;
 import com.formdev.flatlaf.ui.FlatListUI;
 import com.formdev.flatlaf.util.LoggingFacade;
-import com.formdev.flatlaf.util.StringUtils;
 import net.miginfocom.swing.*;
 
 /**
@@ -82,14 +79,13 @@ public class IJThemesPanel
 	};
 	private Window window;
 
-	private File lastDirectory;
 	private boolean isAdjustingThemesList;
 	private long lastLafChangeTime = System.currentTimeMillis();
 
 	public IJThemesPanel() {
 		initComponents();
 
-		saveButton.setEnabled( false );
+		pluginButton.setEnabled( false );
 		sourceCodeButton.setEnabled( false );
 
 		// create renderer
@@ -144,7 +140,7 @@ public class IJThemesPanel
 			private String buildToolTip( IJThemeInfo ti ) {
 				if( ti.themeFile != null )
 					return ti.themeFile.getPath();
-				if( ti.resourceName == null )
+				if( ti.license == null )
 					return ti.name;
 
 				return "Name: " + ti.name
@@ -238,7 +234,6 @@ public class IJThemesPanel
 			for( int i = 0; i < themes.size(); i++ ) {
 				IJThemeInfo theme = themes.get( i );
 				if( oldSel.name.equals( theme.name ) &&
-					Objects.equals( oldSel.resourceName, theme.resourceName ) &&
 					Objects.equals( oldSel.themeFile, theme.themeFile ) &&
 					Objects.equals( oldSel.lafClassName, theme.lafClassName ) )
 				{
@@ -274,9 +269,8 @@ public class IJThemesPanel
 
 	private void themesListValueChanged( ListSelectionEvent e ) {
 		IJThemeInfo themeInfo = themesList.getSelectedValue();
-		boolean bundledTheme = (themeInfo != null && themeInfo.resourceName != null);
+		pluginButton.setEnabled( themeInfo != null && themeInfo.pluginUrl != null );
-		saveButton.setEnabled( bundledTheme );
+		sourceCodeButton.setEnabled( themeInfo != null && themeInfo.sourceCodePath != null );
-		sourceCodeButton.setEnabled( bundledTheme );
 
 		if( e.getValueIsAdjusting() || isAdjustingThemesList )
 			return;
@@ -307,21 +301,21 @@ public class IJThemesPanel
 			FlatAnimatedLafChange.showSnapshot();
 
 			try {
-				if( themeInfo.themeFile.getName().endsWith( ".properties" ) ) {
+				if( themeInfo.themeFile.getName().endsWith( ".properties" ) )
 				    FlatLaf.setup( new FlatPropertiesLaf( themeInfo.name, themeInfo.themeFile ) );
-				} else
+				else
 				    FlatLaf.setup( IntelliJTheme.createLaf( new FileInputStream( themeInfo.themeFile ) ) );
 
-				DemoPrefs.getState().put( DemoPrefs.KEY_LAF_THEME, DemoPrefs.FILE_PREFIX + themeInfo.themeFile );
+				DemoPrefs.getState().put( DemoPrefs.KEY_LAF_THEME_FILE, themeInfo.themeFile.getAbsolutePath() );
 			} catch( Exception ex ) {
 				LoggingFacade.INSTANCE.logSevere( null, ex );
 				showInformationDialog( "Failed to load '" + themeInfo.themeFile + "'.", ex );
 			}
 		} else {
-			FlatAnimatedLafChange.showSnapshot();
+			JOptionPane.showMessageDialog( SwingUtilities.windowForComponent( this ),
-
+				"Missing lafClassName for '" + themeInfo.name + "'",
-			IntelliJTheme.setup( getClass().getResourceAsStream( THEMES_PACKAGE + themeInfo.resourceName ) );
+				"FlatLaf", JOptionPane.INFORMATION_MESSAGE );
-		    DemoPrefs.getState().put( DemoPrefs.KEY_LAF_THEME, DemoPrefs.RESOURCE_PREFIX + themeInfo.resourceName );
+			return;
 		}
 
 		// update all components
@@ -329,56 +323,31 @@ public class IJThemesPanel
 		FlatAnimatedLafChange.hideSnapshotWithAnimation();
 	}
 
-	private void saveTheme() {
+	private void browsePlugin() {
 		IJThemeInfo themeInfo = themesList.getSelectedValue();
-		if( themeInfo == null || themeInfo.resourceName == null )
+		if( themeInfo == null || themeInfo.pluginUrl == null )
 			return;
 
-		JFileChooser fileChooser = new JFileChooser();
+		browse( themeInfo.pluginUrl );
-		fileChooser.setSelectedFile( new File( lastDirectory, themeInfo.resourceName ) );
-		if( fileChooser.showSaveDialog( SwingUtilities.windowForComponent( this ) ) != JFileChooser.APPROVE_OPTION )
-			return;
-
-		File file = fileChooser.getSelectedFile();
-		lastDirectory = file.getParentFile();
-
-		// save theme
-		try {
-			Files.copy( getClass().getResourceAsStream( THEMES_PACKAGE + themeInfo.resourceName ),
-				file.toPath(), StandardCopyOption.REPLACE_EXISTING );
-		} catch( IOException ex ) {
-			showInformationDialog( "Failed to save theme to '" + file + "'.", ex );
-			return;
-		}
-
-		// save license
-		if( themeInfo.licenseFile != null ) {
-			try {
-				File licenseFile = new File( file.getParentFile(),
-					StringUtils.removeTrailing( file.getName(), ".theme.json" ) +
-					themeInfo.licenseFile.substring( themeInfo.licenseFile.indexOf( '.' ) ) );
-				Files.copy( getClass().getResourceAsStream( THEMES_PACKAGE + themeInfo.licenseFile ),
-					licenseFile.toPath(), StandardCopyOption.REPLACE_EXISTING );
-			} catch( IOException ex ) {
-				showInformationDialog( "Failed to save theme license to '" + file + "'.", ex );
-				return;
-			}
-		}
 	}
 
 	private void browseSourceCode() {
 		IJThemeInfo themeInfo = themesList.getSelectedValue();
-		if( themeInfo == null || themeInfo.resourceName == null )
+		if( themeInfo == null || themeInfo.sourceCodeUrl == null )
 			return;
 
 		String themeUrl = themeInfo.sourceCodeUrl;
 		if( themeInfo.sourceCodePath != null )
 			themeUrl += '/' + themeInfo.sourceCodePath;
-		themeUrl = themeUrl.replace( " ", "%20" );
+		browse( themeUrl );
+	}
+
+	private void browse( String url ) {
+		url = url.replace( " ", "%20" );
 		try {
-			Desktop.getDesktop().browse( new URI( themeUrl ) );
+			Desktop.getDesktop().browse( new URI( url ) );
 		} catch( IOException | URISyntaxException ex ) {
-			showInformationDialog( "Failed to browse '" + themeUrl + "'.", ex );
+			showInformationDialog( "Failed to browse '" + url + "'.", ex );
 		}
 	}
 
@@ -414,7 +383,10 @@ public class IJThemesPanel
 
 	private void lafChanged( PropertyChangeEvent e ) {
 		if( "lookAndFeel".equals( e.getPropertyName() ) ) {
-			selectedCurrentLookAndFeel();
+			// use invokeLater() because KEY_LAF_THEME_FILE is updated after this event
+			EventQueue.invokeLater( () -> {
+				selectedCurrentLookAndFeel();
+			} );
 			lastLafChangeTime = System.currentTimeMillis();
 		}
 	}
@@ -430,19 +402,19 @@ public class IJThemesPanel
 			if( laf instanceof FlatLaf ) {
 				List<Class<?>> lafClasses = new ArrayList<>();
 
+				// same as in UIDefaultsLoader.getLafClassesForDefaultsLoading()
+				for( Class<?> lafClass = laf.getClass();
+					FlatLaf.class.isAssignableFrom( lafClass );
+					lafClass = lafClass.getSuperclass() )
+				{
+					lafClasses.add( 0, lafClass );
+				}
+
+				// same as in IntelliJTheme.ThemeLaf.getLafClassesForDefaultsLoading()
 				if( laf instanceof IntelliJTheme.ThemeLaf ) {
 					boolean dark = ((FlatLaf)laf).isDark();
-					lafClasses.add( FlatLaf.class );
+					lafClasses.add( 1, dark ? FlatDarkLaf.class : FlatLightLaf.class );
-					lafClasses.add( dark ? FlatDarkLaf.class : FlatLightLaf.class );
+					lafClasses.add( 2, dark ? FlatDarculaLaf.class : FlatIntelliJLaf.class );
-					lafClasses.add( dark ? FlatDarculaLaf.class : FlatIntelliJLaf.class );
-					lafClasses.add( IntelliJTheme.ThemeLaf.class );
-				} else {
-					for( Class<?> lafClass = laf.getClass();
-						FlatLaf.class.isAssignableFrom( lafClass );
-						lafClass = lafClass.getSuperclass() )
-					{
-						lafClasses.add( 0, lafClass );
-					}
 				}
 
 				boolean reload = false;
@@ -469,23 +441,19 @@ public class IJThemesPanel
 	}
 
 	private void selectedCurrentLookAndFeel() {
-		LookAndFeel lookAndFeel = UIManager.getLookAndFeel();
-		String theme = UIManager.getLookAndFeelDefaults().getString( DemoPrefs.THEME_UI_KEY );
-
-		if( theme == null && (lookAndFeel instanceof IntelliJTheme.ThemeLaf || lookAndFeel instanceof FlatPropertiesLaf) )
-			return;
-
 		Predicate<IJThemeInfo> test;
-		if( theme != null && theme.startsWith( DemoPrefs.RESOURCE_PREFIX ) ) {
+		String lafClassName = UIManager.getLookAndFeel().getClass().getName();
-			String resourceName = theme.substring( DemoPrefs.RESOURCE_PREFIX.length() );
+		if( FlatPropertiesLaf.class.getName().equals( lafClassName ) ||
-			test = ti -> Objects.equals( ti.resourceName, resourceName );
+			IntelliJTheme.ThemeLaf.class.getName().equals( lafClassName ) )
-		} else if( theme != null && theme.startsWith( DemoPrefs.FILE_PREFIX ) ) {
+		{
-			File themeFile = new File( theme.substring( DemoPrefs.FILE_PREFIX.length() ) );
+			String themeFileName = DemoPrefs.getState().get( DemoPrefs.KEY_LAF_THEME_FILE, "" );
+			if( themeFileName == null )
+				return;
+
+			File themeFile = new File( themeFileName );
 			test = ti -> Objects.equals( ti.themeFile, themeFile );
-		} else {
+		} else
-			String lafClassName = lookAndFeel.getClass().getName();
 			test = ti -> Objects.equals( ti.lafClassName, lafClassName );
-		}
 
 		int newSel = -1;
 		for( int i = 0; i < themes.size(); i++ ) {
@@ -512,7 +480,7 @@ public class IJThemesPanel
 		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
 		JLabel themesLabel = new JLabel();
 		toolBar = new JToolBar();
-		saveButton = new JButton();
+		pluginButton = new JButton();
 		sourceCodeButton = new JButton();
 		filterComboBox = new JComboBox<>();
 		themesScrollPane = new JScrollPane();
@@ -535,11 +503,11 @@ public class IJThemesPanel
 		{
 			toolBar.setFloatable(false);
 
-			//---- saveButton ----
+			//---- pluginButton ----
-			saveButton.setToolTipText("Save .theme.json of selected IntelliJ theme to file.");
+			pluginButton.setToolTipText("Opens the IntelliJ plugin page of selected IntelliJ theme in the browser.");
-			saveButton.setIcon(new FlatSVGIcon("com/formdev/flatlaf/demo/icons/download.svg"));
+			pluginButton.setIcon(new FlatSVGIcon("com/formdev/flatlaf/demo/icons/plugin.svg"));
-			saveButton.addActionListener(e -> saveTheme());
+			pluginButton.addActionListener(e -> browsePlugin());
-			toolBar.add(saveButton);
+			toolBar.add(pluginButton);
 
 			//---- sourceCodeButton ----
 			sourceCodeButton.setToolTipText("Opens the source code repository of selected IntelliJ theme in the browser.");
@@ -574,7 +542,7 @@ public class IJThemesPanel
 
 	// JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
 	private JToolBar toolBar;
-	private JButton saveButton;
+	private JButton pluginButton;
 	private JButton sourceCodeButton;
 	private JComboBox<String> filterComboBox;
 	private JScrollPane themesScrollPane;

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/intellijthemes/IJThemesPanel.jfd

@@ -1,4 +1,4 @@
-JFDML JFormDesigner: "8.1.0.0.283" Java: "19.0.2" encoding: "UTF-8"
+JFDML JFormDesigner: "8.3" encoding: "UTF-8"
 
 new FormModel {
 	contentType: "form/swing"
@@ -22,10 +22,10 @@ new FormModel {
 				name: "toolBar"
 				"floatable": false
 				add( new FormComponent( "javax.swing.JButton" ) {
-					name: "saveButton"
+					name: "pluginButton"
-					"toolTipText": "Save .theme.json of selected IntelliJ theme to file."
+					"toolTipText": "Opens the IntelliJ plugin page of selected IntelliJ theme in the browser."
-					"icon": new com.jformdesigner.model.SwingIcon( 0, "/com/formdev/flatlaf/demo/icons/download.svg" )
+					"icon": new com.jformdesigner.model.SwingIcon( 0, "/com/formdev/flatlaf/demo/icons/plugin.svg" )
-					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "saveTheme", false ) )
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "browsePlugin", false ) )
 				} )
 				add( new FormComponent( "javax.swing.JButton" ) {
 					name: "sourceCodeButton"

flatlaf-demo/src/main/resources/com/formdev/flatlaf/demo/icons/download.svg

@@ -1,7 +0,0 @@
-<!-- Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
-<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
-  <g fill="none" fill-rule="evenodd">
-    <polygon fill="#6E6E6E" points="9 7 12 7 8 11 4 7 7 7 7 2 9 2" transform="matrix(-1 0 0 1 16 0)"/>
-    <rect width="12" height="2" x="2" y="12" fill="#6E6E6E"/>
-  </g>
-</svg>

flatlaf-demo/src/main/resources/com/formdev/flatlaf/demo/icons/plugin.svg

@@ -0,0 +1,4 @@
+<!-- Copyright 2000-2022 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M11 4H7C5.34315 4 4 5.34315 4 7V9C4 10.6569 5.34315 12 7 12H11V11V10V6V5V4ZM12 5V4C12 3.44772 11.5523 3 11 3H7C5.13616 3 3.57006 4.27477 3.12602 6H1C0.447715 6 0 6.44772 0 7V9C0 9.55228 0.447715 10 1 10H3.12602C3.57006 11.7252 5.13616 13 7 13H11C11.5523 13 12 12.5523 12 12V11H15.5C15.7761 11 16 10.7761 16 10.5C16 10.2239 15.7761 10 15.5 10H12V6H15.5C15.7761 6 16 5.77614 16 5.5C16 5.22386 15.7761 5 15.5 5H12ZM3 7V9H1V7L3 7Z" fill="#6C707E"/>
+</svg>

flatlaf-demo/src/main/resources/com/formdev/flatlaf/demo/icons/plugin_dark.svg

@@ -0,0 +1,4 @@
+<!-- Copyright 2000-2022 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M11 4H7C5.34315 4 4 5.34315 4 7V9C4 10.6569 5.34315 12 7 12H11V11V10V6V5V4ZM12 5V4C12 3.44772 11.5523 3 11 3H7C5.13616 3 3.57006 4.27477 3.12602 6H1C0.447715 6 0 6.44772 0 7V9C0 9.55228 0.447715 10 1 10H3.12602C3.57006 11.7252 5.13616 13 7 13H11C11.5523 13 12 12.5523 12 12V11H15.5C15.7761 11 16 10.7761 16 10.5C16 10.2239 15.7761 10 15.5 10H12V6H15.5C15.7761 6 16 5.77614 16 5.5C16 5.22386 15.7761 5 15.5 5H12ZM3 7V9H1V7L3 7Z" fill="#CED0D6"/>
+</svg>

flatlaf-demo/src/main/resources/com/formdev/flatlaf/demo/intellijthemes/themes.json

@@ -1,6 +1,7 @@
 {
 	"arc-theme.theme.json": {
 		"name": "Arc",
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatArcIJTheme",
 		"license": "MIT",
 		"licenseFile": "arc-themes.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12451-arc-theme",
@@ -9,6 +10,7 @@
 	},
 	"arc-theme-orange.theme.json": {
 		"name": "Arc - Orange",
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatArcOrangeIJTheme",
 		"license": "MIT",
 		"licenseFile": "arc-themes.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12451-arc-theme",
@@ -18,6 +20,7 @@
 	"arc_theme_dark.theme.json": {
 		"name": "Arc Dark",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatArcDarkIJTheme",
 		"license": "MIT",
 		"licenseFile": "arc-themes.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/15175-arc-theme-dark",
@@ -27,6 +30,7 @@
 	"arc_theme_dark_orange.theme.json": {
 		"name": "Arc Dark - Orange",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatArcDarkOrangeIJTheme",
 		"license": "MIT",
 		"licenseFile": "arc-themes.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/15175-arc-theme-dark",
@@ -36,6 +40,7 @@
 	"Carbon.theme.json": {
 		"name": "Carbon",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatCarbonIJTheme",
 		"license": "Apache License 2.0",
 		"licenseFile": "arc-themes.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12280-carbon",
@@ -45,6 +50,7 @@
 	"Cobalt_2.theme.json": {
 		"name": "Cobalt 2",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatCobalt2IJTheme",
 		"license": "MIT",
 		"licenseFile": "Cobalt_2.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/10745-cobalt-2",
@@ -54,6 +60,7 @@
 	"Cyan.theme.json": {
 		"name": "Cyan light",
 		"license": "MIT",
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatCyanLightIJTheme",
 		"licenseFile": "Cyan.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12102-cyan-light-theme",
 		"sourceCodeUrl": "https://github.com/OlyaB/CyanTheme",
@@ -62,6 +69,7 @@
 	"DarkFlatTheme.theme.json": {
 		"name": "Dark Flat",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatDarkFlatIJTheme",
 		"license": "MIT",
 		"licenseFile": "DarkFlatTheme.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12165-dark-flat-theme",
@@ -71,6 +79,7 @@
 	"DarkPurple.theme.json": {
 		"name": "Dark purple",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatDarkPurpleIJTheme",
 		"license": "MIT",
 		"licenseFile": "DarkPurple.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12100-dark-purple-theme",
@@ -80,6 +89,7 @@
 	"Dracula.theme.json": {
 		"name": "Dracula",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatDraculaIJTheme",
 		"license": "MIT",
 		"licenseFile": "Dracula.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12275-dracula-theme",
@@ -89,6 +99,7 @@
 	"Gradianto_dark_fuchsia.theme.json": {
 		"name": "Gradianto Dark Fuchsia",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatGradiantoDarkFuchsiaIJTheme",
 		"license": "MIT",
 		"licenseFile": "Gradianto.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12334-gradianto",
@@ -98,6 +109,7 @@
 	"Gradianto_deep_ocean.theme.json": {
 		"name": "Gradianto Deep Ocean",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatGradiantoDeepOceanIJTheme",
 		"license": "MIT",
 		"licenseFile": "Gradianto.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12334-gradianto",
@@ -107,6 +119,7 @@
 	"Gradianto_midnight_blue.theme.json": {
 		"name": "Gradianto Midnight Blue",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatGradiantoMidnightBlueIJTheme",
 		"license": "MIT",
 		"licenseFile": "Gradianto.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12334-gradianto",
@@ -116,6 +129,7 @@
 	"Gradianto_Nature_Green.theme.json": {
 		"name": "Gradianto Nature Green",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatGradiantoNatureGreenIJTheme",
 		"license": "MIT",
 		"licenseFile": "Gradianto.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12334-gradianto",
@@ -125,6 +139,7 @@
 	"Gray.theme.json": {
 		"name": "Gray",
 		"license": "MIT",
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatGrayIJTheme",
 		"licenseFile": "Gray.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12103-gray-theme",
 		"sourceCodeUrl": "https://github.com/OlyaB/GreyTheme",
@@ -133,6 +148,7 @@
 	"gruvbox_dark_hard.theme.json": {
 		"name": "Gruvbox Dark Hard",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatGruvboxDarkHardIJTheme",
 		"license": "MIT",
 		"licenseFile": "gruvbox_theme.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12310-gruvbox-theme",
@@ -142,6 +158,7 @@
 	"gruvbox_dark_medium.theme.json": {
 		"name": "Gruvbox Dark Medium",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatGruvboxDarkMediumIJTheme",
 		"license": "MIT",
 		"licenseFile": "gruvbox_theme.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12310-gruvbox-theme",
@@ -151,6 +168,7 @@
 	"gruvbox_dark_soft.theme.json": {
 		"name": "Gruvbox Dark Soft",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatGruvboxDarkSoftIJTheme",
 		"license": "MIT",
 		"licenseFile": "gruvbox_theme.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12310-gruvbox-theme",
@@ -160,6 +178,7 @@
 	"HiberbeeDark.theme.json": {
 		"name": "Hiberbee Dark",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatHiberbeeDarkIJTheme",
 		"license": "MIT",
 		"licenseFile": "Hiberbee.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12118-hiberbee-theme",
@@ -169,6 +188,7 @@
 	"HighContrast.theme.json": {
 		"name": "High Contrast",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatHighContrastIJTheme",
 		"license": "Apache License 2.0",
 		"licenseFile": "HighContrast.LICENSE.txt",
 		"sourceCodeUrl": "https://github.com/JetBrains/intellij-community",
@@ -177,6 +197,7 @@
 	"LightFlatTheme.theme.json": {
 		"name": "Light Flat",
 		"license": "MIT",
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatLightFlatIJTheme",
 		"licenseFile": "LightFlatTheme.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12169-light-flat-theme",
 		"sourceCodeUrl": "https://github.com/nerzhulart/LightFlatTheme",
@@ -185,6 +206,7 @@
 	"MaterialTheme.theme.json": {
 		"name": "Material Design Dark",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatMaterialDesignDarkIJTheme",
 		"license": "MIT",
 		"licenseFile": "MaterialTheme.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12134-material-design-dark-theme",
@@ -194,6 +216,7 @@
 	"Monocai.theme.json": {
 		"name": "Monocai",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatMonocaiIJTheme",
 		"license": "MIT",
 		"licenseFile": "Monocai.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12163-monocai-color-theme",
@@ -204,6 +227,7 @@
 		"name": "Monokai Pro",
 		"discontinued": true,
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatMonokaiProIJTheme",
 		"license": "MIT",
 		"licenseFile": "Monokai_Pro.LICENSE.txt",
 		"sourceCodeUrl": "https://github.com/subtheme-dev/monokai-pro"
@@ -211,6 +235,7 @@
 	"nord.theme.json": {
 		"name": "Nord",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatNordIJTheme",
 		"license": "MIT",
 		"licenseFile": "nord.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/10321-nord",
@@ -220,6 +245,7 @@
 	"one_dark.theme.json": {
 		"name": "One Dark",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatOneDarkIJTheme",
 		"license": "MIT",
 		"licenseFile": "one_dark.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/11938-one-dark-theme",
@@ -230,6 +256,7 @@
 		"name": "Solarized Dark",
 		"discontinued": true,
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatSolarizedDarkIJTheme",
 		"license": "The Unlicense",
 		"licenseFile": "Solarized.LICENSE.txt",
 		"sourceCodeUrl": "https://github.com/4lex4/intellij-platform-solarized",
@@ -238,6 +265,7 @@
 	"SolarizedLight.theme.json": {
 		"name": "Solarized Light",
 		"discontinued": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatSolarizedLightIJTheme",
 		"license": "The Unlicense",
 		"licenseFile": "Solarized.LICENSE.txt",
 		"sourceCodeUrl": "https://github.com/4lex4/intellij-platform-solarized",
@@ -246,6 +274,7 @@
 	"Spacegray.theme.json": {
 		"name": "Spacegray",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatSpacegrayIJTheme",
 		"license": "MIT",
 		"licenseFile": "Spacegray.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12122-spacegray-theme",
@@ -255,6 +284,7 @@
 	"vuesion_theme.theme.json": {
 		"name": "Vuesion",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatVuesionIJTheme",
 		"license": "MIT",
 		"licenseFile": "vuesion_theme.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/12226-vuesion-theme",
@@ -264,6 +294,7 @@
 	"Xcode-Dark.theme.json": {
 		"name": "Xcode-Dark",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.FlatXcodeDarkIJTheme",
 		"license": "MIT",
 		"licenseFile": "Xcode-Dark.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/13106-xcode-dark-theme",
@@ -274,6 +305,7 @@
 	"material-theme-ui-lite/Arc Dark.theme.json": {
 		"name": "Material Theme UI Lite / Arc Dark",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatArcDarkIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -283,6 +315,7 @@
 	"material-theme-ui-lite/Atom One Dark.theme.json": {
 		"name": "Material Theme UI Lite / Atom One Dark",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatAtomOneDarkIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -291,6 +324,7 @@
 	},
 	"material-theme-ui-lite/Atom One Light.theme.json": {
 		"name": "Material Theme UI Lite / Atom One Light",
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatAtomOneLightIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -300,6 +334,7 @@
 	"material-theme-ui-lite/Dracula.theme.json": {
 		"name": "Material Theme UI Lite / Dracula",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatDraculaIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -308,6 +343,7 @@
 	},
 	"material-theme-ui-lite/GitHub.theme.json": {
 		"name": "Material Theme UI Lite / GitHub",
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatGitHubIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -317,6 +353,7 @@
 	"material-theme-ui-lite/GitHub Dark.theme.json": {
 		"name": "Material Theme UI Lite / GitHub Dark",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatGitHubDarkIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -325,6 +362,7 @@
 	},
 	"material-theme-ui-lite/Light Owl.theme.json": {
 		"name": "Material Theme UI Lite / Light Owl",
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatLightOwlIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -334,6 +372,7 @@
 	"material-theme-ui-lite/Material Darker.theme.json": {
 		"name": "Material Theme UI Lite / Material Darker",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatMaterialDarkerIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -343,6 +382,7 @@
 	"material-theme-ui-lite/Material Deep Ocean.theme.json": {
 		"name": "Material Theme UI Lite / Material Deep Ocean",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatMaterialDeepOceanIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -351,6 +391,7 @@
 	},
 	"material-theme-ui-lite/Material Lighter.theme.json": {
 		"name": "Material Theme UI Lite / Material Lighter",
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatMaterialLighterIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -360,6 +401,7 @@
 	"material-theme-ui-lite/Material Oceanic.theme.json": {
 		"name": "Material Theme UI Lite / Material Oceanic",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatMaterialOceanicIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -369,6 +411,7 @@
 	"material-theme-ui-lite/Material Palenight.theme.json": {
 		"name": "Material Theme UI Lite / Material Palenight",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatMaterialPalenightIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -378,6 +421,7 @@
 	"material-theme-ui-lite/Monokai Pro.theme.json": {
 		"name": "Material Theme UI Lite / Monokai Pro",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatMonokaiProIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -387,6 +431,7 @@
 	"material-theme-ui-lite/Moonlight.theme.json": {
 		"name": "Material Theme UI Lite / Moonlight",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatMoonlightIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -396,6 +441,7 @@
 	"material-theme-ui-lite/Night Owl.theme.json": {
 		"name": "Material Theme UI Lite / Night Owl",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatNightOwlIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -405,6 +451,7 @@
 	"material-theme-ui-lite/Solarized Dark.theme.json": {
 		"name": "Material Theme UI Lite / Solarized Dark",
 		"dark": true,
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatSolarizedDarkIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",
@@ -413,6 +460,7 @@
 	},
 	"material-theme-ui-lite/Solarized Light.theme.json": {
 		"name": "Material Theme UI Lite / Solarized Light",
+		"lafClassName": "com.formdev.flatlaf.intellijthemes.materialthemeuilite.FlatSolarizedLightIJTheme",
 		"license": "MIT",
 		"licenseFile": "material-theme-ui-lite/Material Theme UI Lite.LICENSE.txt",
 		"pluginUrl": "https://plugins.jetbrains.com/plugin/8006-material-theme-ui",

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

@@ -576,7 +576,7 @@ public class FlatTestFrame
 		UIManager.put( "defaultFont", null );
 
 		LookAndFeel lookAndFeel = UIManager.getLookAndFeel();
-		IntelliJTheme theme = (lookAndFeel instanceof IntelliJTheme.ThemeLaf)
+		IntelliJTheme theme = (lookAndFeel.getClass() == IntelliJTheme.ThemeLaf.class)
 			? ((IntelliJTheme.ThemeLaf)lookAndFeel).getTheme()
 			: null;
 		String nameForProperties = null;