Demo: restore last used theme on startup

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

@@ -164,8 +164,6 @@ class ControlBar
 		if( lafClassName.equals( UIManager.getLookAndFeel().getClass().getName() ) )
 			return;
 
-		FlatLafDemo.prefs.put( FlatLafDemo.KEY_LAF, lafClassName );
-
 		EventQueue.invokeLater( () -> {
 			try {
 				// change look and feel

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

@@ -30,7 +30,7 @@ class DemoFrame
 	extends JFrame
 {
 	DemoFrame() {
-		int tabIndex = FlatLafDemo.prefs.getInt( FlatLafDemo.KEY_TAB, 0 );
+		int tabIndex = DemoPrefs.getState().getInt( FlatLafDemo.KEY_TAB, 0 );
 
 		initComponents();
 		controlBar.initialize( this, tabbedPane );
@@ -48,7 +48,7 @@ class DemoFrame
 	}
 
 	private void selectedTabChanged() {
-		FlatLafDemo.prefs.putInt( FlatLafDemo.KEY_TAB, tabbedPane.getSelectedIndex() );
+		DemoPrefs.getState().putInt( FlatLafDemo.KEY_TAB, tabbedPane.getSelectedIndex() );
 	}
 
 	private void initComponents() {

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

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.demo;
+
+import java.io.FileInputStream;
+import java.util.prefs.Preferences;
+import javax.swing.UIManager;
+import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.FlatLightLaf;
+import com.formdev.flatlaf.IntelliJTheme;
+import com.formdev.flatlaf.demo.intellijthemes.IJThemesPanel;
+
+/**
+ * @author Karl Tauber
+ */
+public class DemoPrefs
+{
+	public static final String KEY_LAF = "laf";
+	public static final String KEY_LAF_INTELLIJ_THEME = "lafIntelliJTheme";
+
+	public static final String RESOURCE_PREFIX = "res:";
+	public static final String FILE_PREFIX = "file:";
+
+	public static final String INTELLIJ_THEME_UI_KEY = "__FlatLaf.demo.intelliJTheme";
+
+	private static Preferences state;
+
+	public static Preferences getState() {
+		return state;
+	}
+
+	public static void init( String rootPath ) {
+		state = Preferences.userRoot().node( rootPath );
+	}
+
+	public static void initLaf( String[] args ) {
+		// set look and feel
+		try {
+			if( args.length > 0 )
+				UIManager.setLookAndFeel( args[0] );
+			else {
+				String lafClassName = state.get( KEY_LAF, FlatLightLaf.class.getName() );
+				if( IntelliJTheme.ThemeLaf.class.getName().equals( lafClassName ) ) {
+					String intelliJTheme = state.get( KEY_LAF_INTELLIJ_THEME, "" );
+					if( intelliJTheme.startsWith( RESOURCE_PREFIX ) )
+						IntelliJTheme.install( IJThemesPanel.class.getResourceAsStream( intelliJTheme.substring( RESOURCE_PREFIX.length() ) ) );
+					else if( intelliJTheme.startsWith( FILE_PREFIX ) )
+					    FlatLaf.install( IntelliJTheme.createLaf( new FileInputStream( intelliJTheme.substring( FILE_PREFIX.length() ) ) ) );
+					else
+						FlatLightLaf.install();
+
+					if( !intelliJTheme.isEmpty() )
+						UIManager.getLookAndFeelDefaults().put( INTELLIJ_THEME_UI_KEY, intelliJTheme );
+				} else
+					UIManager.setLookAndFeel( lafClassName );
+			}
+		} catch( Exception ex ) {
+			ex.printStackTrace();
+
+			// fallback
+			FlatLightLaf.install();
+		}
+
+		// remember active look and feel
+		UIManager.addPropertyChangeListener( e -> {
+			if( "lookAndFeel".equals( e.getPropertyName() ) )
+				state.put( KEY_LAF, UIManager.getLookAndFeel().getClass().getName() );
+		} );
+	}
+}

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

@@ -16,10 +16,7 @@
 
 package com.formdev.flatlaf.demo;
 
-import java.util.prefs.Preferences;
 import javax.swing.SwingUtilities;
-import javax.swing.UIManager;
-import com.formdev.flatlaf.FlatLightLaf;
 
 /**
  * @author Karl Tauber
@@ -27,29 +24,14 @@ import com.formdev.flatlaf.FlatLightLaf;
 public class FlatLafDemo
 {
 	static final String PREFS_ROOT_PATH = "/flatlaf-demo";
-	static final String KEY_LAF = "laf";
 	static final String KEY_TAB = "tab";
 
-	static Preferences prefs;
-
 	public static void main( String[] args ) {
 		SwingUtilities.invokeLater( () -> {
-			prefs = Preferences.userRoot().node( PREFS_ROOT_PATH );
+			DemoPrefs.init( PREFS_ROOT_PATH );
 
 			// set look and feel
-			try {
+			DemoPrefs.initLaf( args );
-				if( args.length > 0 )
-					UIManager.setLookAndFeel( args[0] );
-				else {
-					String lafClassName = prefs.get( KEY_LAF, FlatLightLaf.class.getName() );
-					UIManager.setLookAndFeel( lafClassName );
-				}
-			} catch( Exception ex ) {
-				ex.printStackTrace();
-
-				// fallback
-				FlatLightLaf.install();
-			}
 
 			// create frame
 			DemoFrame frame = new DemoFrame();

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

@@ -37,6 +37,7 @@ import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Objects;
+import java.util.function.Predicate;
 import javax.swing.*;
 import javax.swing.border.CompoundBorder;
 import javax.swing.event.*;
@@ -46,6 +47,7 @@ import com.formdev.flatlaf.FlatIntelliJLaf;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.FlatLightLaf;
 import com.formdev.flatlaf.IntelliJTheme;
+import com.formdev.flatlaf.demo.DemoPrefs;
 import com.formdev.flatlaf.extras.FlatSVGIcon;
 import com.formdev.flatlaf.util.StringUtils;
 import net.miginfocom.swing.*;
@@ -222,12 +224,15 @@ public class IJThemesPanel
 		} else if( themeInfo.themeFile != null ) {
 			try {
 			    FlatLaf.install( IntelliJTheme.createLaf( new FileInputStream( themeInfo.themeFile ) ) );
+			    DemoPrefs.getState().put( DemoPrefs.KEY_LAF_INTELLIJ_THEME, DemoPrefs.FILE_PREFIX + themeInfo.themeFile );
 			} catch( Exception ex ) {
 				ex.printStackTrace();
 				showInformationDialog( "Failed to load '" + themeInfo.themeFile + "'.", ex );
 			}
-		} else
+		} else {
 			IntelliJTheme.install( getClass().getResourceAsStream( themeInfo.resourceName ) );
+		    DemoPrefs.getState().put( DemoPrefs.KEY_LAF_INTELLIJ_THEME, DemoPrefs.RESOURCE_PREFIX + themeInfo.resourceName );
+		}
 
 		// update all components
 		FlatLaf.updateUI();
@@ -326,22 +331,36 @@ public class IJThemesPanel
 
 	private void selectedCurrentLookAndFeel() {
 		LookAndFeel lookAndFeel = UIManager.getLookAndFeel();
+		String intelliJTheme = UIManager.getLookAndFeelDefaults().getString( DemoPrefs.INTELLIJ_THEME_UI_KEY );
+
+		if( intelliJTheme == null && lookAndFeel instanceof IntelliJTheme.ThemeLaf )
+			return;
+
+		Predicate<IJThemeInfo> test;
+		if( intelliJTheme != null && intelliJTheme.startsWith( DemoPrefs.RESOURCE_PREFIX ) ) {
+			String resourceName = intelliJTheme.substring( DemoPrefs.RESOURCE_PREFIX.length() );
+			test = ti -> Objects.equals( ti.resourceName, resourceName );
+		} else if( intelliJTheme != null && intelliJTheme.startsWith( DemoPrefs.FILE_PREFIX ) ) {
+			File themeFile = new File( intelliJTheme.substring( DemoPrefs.FILE_PREFIX.length() ) );
+			test = ti -> Objects.equals( ti.themeFile, themeFile );
+		} else {
+			String lafClassName = lookAndFeel.getClass().getName();
+			test = ti -> Objects.equals( ti.lafClassName, lafClassName );
+		}
 
 		int newSel = -1;
-		if( !(lookAndFeel instanceof IntelliJTheme.ThemeLaf) ) {
+		for( int i = 0; i < themes.size(); i++ ) {
-			String lafClassName = lookAndFeel.getClass().getName();
+			if( test.test( themes.get( i ) ) ) {
-			for( int i = 0; i < themes.size(); i++ ) {
+				newSel = i;
-				if( lafClassName.equals( themes.get( i ).lafClassName ) ) {
+				break;
-					newSel = i;
-					break;
-				}
 			}
-
-			if( newSel >= 0 )
-				themesList.setSelectedIndex( newSel );
-			else
-				themesList.clearSelection();
 		}
+
+		if( newSel >= 0 ) {
+			if( newSel != themesList.getSelectedIndex() )
+				themesList.setSelectedIndex( newSel );
+		} else
+			themesList.clearSelection();
 	}
 
 	private void initComponents() {

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

@@ -24,7 +24,6 @@ import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
 import java.util.function.BiConsumer;
 import java.util.function.Supplier;
-import java.util.prefs.Preferences;
 import javax.swing.*;
 import javax.swing.UIManager.LookAndFeelInfo;
 import javax.swing.plaf.ColorUIResource;
@@ -37,6 +36,7 @@ import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.FlatLightLaf;
 import com.formdev.flatlaf.IntelliJTheme;
 import com.formdev.flatlaf.demo.LookAndFeelsComboBox;
+import com.formdev.flatlaf.demo.DemoPrefs;
 import com.formdev.flatlaf.demo.intellijthemes.*;
 import com.formdev.flatlaf.extras.*;
 import com.formdev.flatlaf.extras.TriStateCheckBox.State;
@@ -52,7 +52,6 @@ public class FlatTestFrame
 	extends JFrame
 {
 	private static final String PREFS_ROOT_PATH = "/flatlaf-test";
-	private static final String KEY_LAF = "laf";
 	private static final String KEY_SCALE_FACTOR = "scaleFactor";
 
 	private final String title;
@@ -63,29 +62,17 @@ public class FlatTestFrame
 	public boolean useApplyComponentOrientation;
 
 	public static FlatTestFrame create( String[] args, String title ) {
-		Preferences prefs = Preferences.userRoot().node( PREFS_ROOT_PATH );
+		DemoPrefs.init( PREFS_ROOT_PATH );
 
 		// set scale factor
 		if( System.getProperty( "flatlaf.uiScale", System.getProperty( "sun.java2d.uiScale" ) ) == null ) {
-			String scaleFactor = prefs.get( KEY_SCALE_FACTOR, null );
+			String scaleFactor = DemoPrefs.getState().get( KEY_SCALE_FACTOR, null );
 			if( scaleFactor != null )
 				System.setProperty( "flatlaf.uiScale", scaleFactor );
 		}
 
 		// set look and feel
-		try {
+		DemoPrefs.initLaf( args );
-			if( args.length > 0 )
-				UIManager.setLookAndFeel( args[0] );
-			else {
-				String lafClassName = prefs.get( KEY_LAF, FlatLightLaf.class.getName() );
-				UIManager.setLookAndFeel( lafClassName );
-			}
-		} catch( Exception ex ) {
-			ex.printStackTrace();
-
-			// fallback
-			FlatLightLaf.install();
-		}
 
 		// create frame
 		return new FlatTestFrame( title );
@@ -239,8 +226,6 @@ public class FlatTestFrame
 		// hide popup to avoid occasional StackOverflowError when updating UI
 		lookAndFeelComboBox.setPopupVisible( false );
 
-		Preferences.userRoot().node( PREFS_ROOT_PATH ).put( KEY_LAF, lafClassName );
-
 		applyLookAndFeel( lafClassName, null, false );
 	}
 
@@ -358,14 +343,12 @@ public class FlatTestFrame
 		// hide popup to avoid occasional StackOverflowError when updating UI
 		scaleFactorComboBox.setPopupVisible( false );
 
-		Preferences prefs = Preferences.userRoot().node( PREFS_ROOT_PATH );
-
 		if( scaleFactor != null ) {
 			System.setProperty( "flatlaf.uiScale", scaleFactor );
-			prefs.put( KEY_SCALE_FACTOR, scaleFactor );
+			DemoPrefs.getState().put( KEY_SCALE_FACTOR, scaleFactor );
 		} else {
 			System.clearProperty( "flatlaf.uiScale" );
-			prefs.remove( KEY_SCALE_FACTOR );
+			DemoPrefs.getState().remove( KEY_SCALE_FACTOR );
 		}
 
 		LookAndFeel lookAndFeel = UIManager.getLookAndFeel();