Change stylesheet management for line numbers.

richtextfx-demos/src/main/java/org/fxmisc/richtext/demo/JavaKeywords.java

@@ -84,14 +84,16 @@ public static void main(String[] args) {
     @Override
     public void start(Stage primaryStage) {
         CodeArea codeArea = new CodeArea();
-        codeArea.setParagraphGraphicFactory(LineNumberFactory.get(codeArea));
+        String stylesheet = JavaKeywords.class.getResource("java-keywords.css").toExternalForm();
+
+        codeArea.setParagraphGraphicFactory(LineNumberFactory.get(codeArea,stylesheet));
         codeArea.textProperty().addListener((obs, oldText, newText) -> {
             codeArea.setStyleSpans(0, computeHighlighting(newText));
         });
         codeArea.replaceText(0, 0, sampleCode);
 
         Scene scene = new Scene(new StackPane(codeArea), 600, 400);
-        scene.getStylesheets().add(JavaKeywords.class.getResource("java-keywords.css").toExternalForm());
+        scene.getStylesheets().add(stylesheet);
         primaryStage.setScene(scene);
         primaryStage.setTitle("Java Keywords Demo");
         primaryStage.show();

richtextfx-demos/src/main/resources/org/fxmisc/richtext/demo/java-keywords.css

@@ -1,4 +1,17 @@
 .keyword {
-    -fx-fill: brown;
+    -fx-fill: #8a6;
     -fx-font-weight: bold;
+}
+.default {
+    -fx-fill: #666;
+}
+.lineno {
+    -fx-font-family: monospace;
+    -fx-background-color: #eee;
+    -fx-text-fill: #666;
+    -fx-padding: 0 5px;
+}
+.code-area {
+    -fx-font-family: monospace;
+    -fx-background-color: #eee;
 }

richtextfx/src/main/java/org/fxmisc/richtext/LineNumberFactory.java

@@ -1,6 +1,7 @@
 package org.fxmisc.richtext;
 
 import java.util.function.IntFunction;
+import java.util.function.Supplier;
 
 import javafx.scene.Node;
 import javafx.scene.control.Label;
@@ -12,21 +13,27 @@ public class LineNumberFactory implements IntFunction<Node> {
 
     private static final String STYLESHEET = LineNumberFactory.class.getResource("lineno.css").toExternalForm();
 
+    public static IntFunction<Node> get(StyledTextArea<?> area,String customStylesheet) {
+        return new LineNumberFactory(area,customStylesheet);
+    }
     public static IntFunction<Node> get(StyledTextArea<?> area) {
-        return new LineNumberFactory(area);
+        return new LineNumberFactory(area,STYLESHEET);
     }
 
     private final EventStream<Integer> nParagraphs;
 
-    private LineNumberFactory(StyledTextArea<?> area) {
+    private LineNumberFactory(StyledTextArea<?> area,String Stylesheet) {
         nParagraphs = EventStreams.sizeOf(area.getParagraphs());
+        this.Stylesheet = Stylesheet;
     }
 
+    private final String Stylesheet;
+
     @Override
     public Node apply(int idx) {
         Label lineNo = new Label();
         lineNo.getStyleClass().add("lineno");
-        lineNo.getStylesheets().add(STYLESHEET);
+        lineNo.getStylesheets().add(Stylesheet);
 
         // When removed from the scene, stay subscribed to never(), which is
         // a fake subscription that consumes no resources, instead of staying