feat: line number highlight demo (#1200)

* feat: line number highlight demo * Package and class name fix up * Removed unused numberFactory * Only add currentParagraphProperty listener once * Replace complex list usage with SimpleIntegerProperty * Make LineNumberHighLightFactory independent of outer class * Replaced double Label and setVisible with setStyle * Removed unneeded CodeArea field and StackPane * Removed unnecessary index increment * Replaced IntegerProperty with direct currentParagraphProperty use * Removed unneeded graphicFactory wrapper * Added implementation comment * Implemented more efficient style change mechanism * Fixed indent * Renamed variable * Moved to lineindicator folder --------- Co-authored-by: Jurgen <[email protected]>
FXMisc · Jun 25, 2024 · d78bab9 · d78bab9
1 parent 5954a8c
commit d78bab9
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diff --git a/richtextfx-demos/screenshots/LineNumberHighLightDemo.png b/richtextfx-demos/screenshots/LineNumberHighLightDemo.png
diff --git a/...x-demos/src/main/java/org/fxmisc/richtext/demo/lineindicator/LineNumberHighLightDemo.java b/...x-demos/src/main/java/org/fxmisc/richtext/demo/lineindicator/LineNumberHighLightDemo.java
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+package org.fxmisc.richtext.demo.lineindicator;
+
+import javafx.application.Application;
+import javafx.beans.value.ObservableValue;
+import javafx.scene.Node;
+import javafx.scene.Scene;
+import javafx.scene.control.Label;
+import javafx.scene.layout.VBox;
+import javafx.stage.Stage;
+import org.fxmisc.richtext.CodeArea;
+
+import java.util.function.IntFunction;
+
+public class LineNumberHighLightDemo extends Application {
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+
+    @Override
+    public void start(Stage primaryStage) {
+        CodeArea codeArea = new CodeArea();
+        codeArea.replaceText(0,0,"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
+        codeArea.setPrefHeight(600);
+
+        IntFunction<Node> labelFactory = new LineNumberHighLightFactory( codeArea );
+        codeArea.setParagraphGraphicFactory(labelFactory);
+
+        VBox vbox = new VBox();
+        vbox.getChildren().addAll(codeArea);
+
+        Scene scene = new Scene(vbox, 600, 600);
+        primaryStage.setTitle("Line number highLight Demo");
+        primaryStage.setScene(scene);
+        primaryStage.show();
+    }
+
+
+    class LineNumberHighLightFactory implements IntFunction<Node> {
+
+        private final ObservableValue<Integer> shownLines;
+
+        public LineNumberHighLightFactory( CodeArea codeArea ) {
+            shownLines = codeArea.currentParagraphProperty();
+            shownLines.addListener( (ob,oldValue,newValue) ->
+            {
+                codeArea.getParagraphGraphic( oldValue ).setStyle("-fx-text-fill: blue");
+                codeArea.getParagraphGraphic( newValue ).setStyle("-fx-text-fill: red");
+            });
+        }
+
+        @Override
+        public Node apply(int lineIndex) {
+
+            Label after = new Label();
+            after.setText(String.valueOf(lineIndex+1));
+
+            if ( lineIndex != shownLines.getValue() ) {
+                after.setStyle("-fx-text-fill: blue");
+            }
+            else after.setStyle("-fx-text-fill: red");
+
+            return after;
+        }
+    }
+}