Theme Editor: support color preview for color functions

UIDefaultsLoader: made some private methods package private and return parsed valued type

flatlaf-theme-editor/build.gradle.kts

@@ -21,5 +21,5 @@ plugins {
 dependencies {
 	implementation( project( ":flatlaf-core" ) )
 
-	implementation( "com.fifesoft:rsyntaxtextarea:3.1.0" )
+	implementation( "com.fifesoft:rsyntaxtextarea:3.1.1" )
 }

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/UIDefaultsLoaderAccessor.java

@@ -16,6 +16,11 @@
 
 package com.formdev.flatlaf;
 
+import java.util.Collections;
+import java.util.Properties;
+import java.util.function.Function;
+import com.formdev.flatlaf.UIDefaultsLoader.ValueType;
+
 /**
  * Enable accessing package private methods of {@link UIDefaultsLoader}.
  *
@@ -23,6 +28,40 @@ package com.formdev.flatlaf;
  */
 public class UIDefaultsLoaderAccessor
 {
+	public static Object UNKNOWN = ValueType.UNKNOWN;
+	public static Object STRING = ValueType.STRING;
+	public static Object BOOLEAN = ValueType.BOOLEAN;
+	public static Object CHARACTER = ValueType.CHARACTER;
+	public static Object INTEGER = ValueType.INTEGER;
+	public static Object FLOAT = ValueType.FLOAT;
+	public static Object BORDER = ValueType.BORDER;
+	public static Object ICON = ValueType.ICON;
+	public static Object INSETS = ValueType.INSETS;
+	public static Object DIMENSION = ValueType.DIMENSION;
+	public static Object COLOR = ValueType.COLOR;
+	public static Object SCALEDINTEGER = ValueType.SCALEDINTEGER;
+	public static Object SCALEDFLOAT = ValueType.SCALEDFLOAT;
+	public static Object SCALEDINSETS = ValueType.SCALEDINSETS;
+	public static Object SCALEDDIMENSION = ValueType.SCALEDDIMENSION;
+	public static Object INSTANCE = ValueType.INSTANCE;
+	public static Object CLASS = ValueType.CLASS;
+	public static Object GRAYFILTER = ValueType.GRAYFILTER;
+	public static Object NULL = ValueType.NULL;
+	public static Object LAZY = ValueType.LAZY;
+
+	public static String resolveValue( Properties properties, String value ) {
+		return UIDefaultsLoader.resolveValue( properties, value );
+	}
+
+	public static Object parseValue( String key, String value, Object[] resultValueType,
+		Function<String, String> resolver )
+	{
+		ValueType[] resultValueType2 = new ValueType[1];
+		Object result = UIDefaultsLoader.parseValue( key, value, resultValueType2, resolver, Collections.emptyList() );
+		resultValueType[0] = resultValueType2[0];
+		return result;
+	}
+
 	public static int parseColorRGBA( String value ) {
 		return UIDefaultsLoader.parseColorRGBA( value );
 	}

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

@@ -34,6 +34,7 @@ class FlatSyntaxTextArea
 {
 	private boolean useColorOfColorTokens;
 
+	final FlatThemePropertiesSupport propertiesSupport = new FlatThemePropertiesSupport( this );
 	private final Map<String, Color> parsedColorsMap = new HashMap<>();
 
 	FlatSyntaxTextArea() {

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

@@ -103,11 +103,18 @@ class FlatThemeEditorOverlay
 				g.setColor( color );
 				g.fillRect( px, r.y, pw, r.height );
 
+				// if color is semi-transparent paint also none-transparent color
+				int alpha = color.getAlpha();
+				if( alpha != 255 && pw > r.height * 2 ) {
+					g.setColor( new Color( color.getRGB() ) );
+					g.fillRect( px + pw - r.height, r.y, r.height, r.height );
+				}
+
 				// paint text
 				int textX = px - maxTextWidth;
 				if( textX > r.x + gap) {
 					float[] hsl = HSLColor.fromRGB( color );
-					String hslStr = String.format( "HSL %d %d %d",
+					String hslStr = String.format( "HSL %3d %2d %2d",
 						Math.round( hsl[0] ), Math.round( hsl[1] ), Math.round( hsl[2] ) );
 					g.setColor( textArea.getForeground() );
 					FlatUIUtils.drawString( textArea, g, hslStr, textX,
@@ -120,6 +127,10 @@ class FlatThemeEditorOverlay
 	}
 
 	private Color getColorInLine( FlatSyntaxTextArea textArea, int line ) {
+		Object value = textArea.propertiesSupport.getParsedValueAtLine( line );
+		if( value instanceof Color )
+			return (Color) value;
+
 		Token token = textArea.getTokenListForLine( line );
 		for( Token t = token; t != null && t.isPaintable(); t = t.getNextToken() ) {
 			if( t.getType() == FlatThemeTokenMaker.TOKEN_COLOR ) {

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

@@ -0,0 +1,156 @@
+/*
+ * Copyright 2020 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
+ *
+ *     https://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.themeeditor;
+
+import java.awt.Color;
+import java.io.IOException;
+import java.io.StringReader;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Properties;
+import java.util.function.Function;
+import javax.swing.event.DocumentEvent;
+import javax.swing.event.DocumentListener;
+import javax.swing.text.BadLocationException;
+import com.formdev.flatlaf.UIDefaultsLoaderAccessor;
+
+/**
+ * Supports parsing content of text area in FlatLaf properties syntax.
+ *
+ * @author Karl Tauber
+ */
+class FlatThemePropertiesSupport
+	implements DocumentListener
+{
+	private final FlatSyntaxTextArea textArea;
+	private final Function<String, String> resolver;
+	private Properties propertiesCache;
+	private final Map<Integer, Object> parsedValueCache = new HashMap<>();
+
+	FlatThemePropertiesSupport( FlatSyntaxTextArea textArea ) {
+		this.textArea = textArea;
+
+		resolver = v -> {
+			return resolveValue( v );
+		};
+
+		textArea.getDocument().addDocumentListener( this );
+	}
+
+	private String resolveValue( String value ) {
+		return UIDefaultsLoaderAccessor.resolveValue( getProperties(), value );
+	}
+
+	Object getParsedValueAtLine( int line ) {
+		Integer lineKey = line;
+		Object parsedValue = parsedValueCache.get( lineKey );
+		if( parsedValue != null )
+			return !(parsedValue instanceof Exception) ? parsedValue : null;
+
+		KeyValue keyValue = getKeyValueAtLine( line );
+		if( keyValue == null )
+			return null;
+
+		try {
+			Object[] resultValueType = new Object[1];
+			String value = resolveValue( keyValue.value );
+			parsedValue = UIDefaultsLoaderAccessor.parseValue( keyValue.key, value, resultValueType, resolver );
+			parsedValueCache.put( lineKey, parsedValue );
+			return parsedValue;
+		} catch( Exception ex ) {
+			System.out.println( ex.getMessage() ); //TODO
+			parsedValueCache.put( lineKey, ex );
+			return null;
+		}
+	}
+
+	private KeyValue getKeyValueAtLine( int line ) {
+		try {
+			int startOffset = textArea.getLineStartOffset( line );
+			int endOffset = textArea.getLineEndOffset( line );
+			String text = textArea.getText( startOffset, endOffset - startOffset );
+
+			Properties properties = new Properties();
+			properties.load( new StringReader( text ) );
+			if( properties.isEmpty() )
+				return null;
+
+			String key = (String) properties.keys().nextElement();
+			String value = properties.getProperty( key );
+			return new KeyValue( key, value );
+		} catch( BadLocationException | IOException ex ) {
+			// ignore
+			return null;
+		}
+	}
+
+	private Properties getProperties() {
+		if( propertiesCache != null )
+			return propertiesCache;
+
+		propertiesCache = new Properties();
+		try {
+			propertiesCache.load( new StringReader( textArea.getText() ) );
+		} catch( IOException ex ) {
+			ex.printStackTrace(); //TODO
+		}
+		return propertiesCache;
+	}
+
+	private void clearCache() {
+		propertiesCache = null;
+		parsedValueCache.clear();
+	}
+
+	//---- interface DocumentListener ----
+
+	@Override
+	public void insertUpdate( DocumentEvent e ) {
+		clearCache();
+	}
+
+	@Override
+	public void removeUpdate( DocumentEvent e ) {
+		clearCache();
+	}
+
+	@Override
+	public void changedUpdate( DocumentEvent e ) {
+	}
+
+	//---- class KeyValue -----------------------------------------------------
+
+	static class CacheLineInfo {
+		Object parsedValue;
+		Object valueType;
+		Exception parseError;
+
+		Color origColor;
+	}
+
+	//---- class KeyValue -----------------------------------------------------
+
+	static class KeyValue {
+		final String key;
+		final String value;
+
+		KeyValue( String key, String value ) {
+			this.key = key;
+			this.value = value;
+		}
+	}
+}

flatlaf-theme-editor/theme-editor-test.properties

@@ -33,8 +33,8 @@ Prop.lazy=lazy(Prop.string)
 
 Prop.colorFunc1=rgb(12,34,56)
 Prop.colorFunc2=rgba(12,34,56,78)
-Prop.colorFunc3=hsl(12,34,56)
-Prop.colorFunc4=hsla(12,34,56,78)
+Prop.colorFunc3=hsl(12,34%,56%)
+Prop.colorFunc4=hsla(12,34%,56%,78%)
 
 Prop.colorFunc5=lighten(#fe1289,20%)
 Prop.colorFunc6=darken(#fe1289,20%)