Generate reflective clearChildren if component does not extend Pane

annotation-processor/src/main/java/org/fulib/fx/FxClassGenerator.java

@@ -44,6 +44,10 @@ public class FxClassGenerator {
      * The `javafx.scene.Parent` type.
      */
     private final TypeMirror parent;
+    /**
+     * The `javafx.scene.layout.Pane` type.
+     */
+    private final TypeMirror pane;
 
     public FxClassGenerator(ProcessingHelper helper, ProcessingEnvironment processingEnv) {
         this.helper = helper;
@@ -61,6 +65,7 @@ public FxClassGenerator(ProcessingHelper helper, ProcessingEnvironment processin
             .orElseThrow();
 
         parent = processingEnv.getElementUtils().getTypeElement("javafx.scene.Parent").asType();
+        pane = processingEnv.getElementUtils().getTypeElement("javafx.scene.layout.Pane").asType();
     }
 
     public void generateSidecar(TypeElement componentClass) {
@@ -303,9 +308,7 @@ private void generateRenderResult(PrintWriter out, TypeElement componentClass) {
             if (view.isEmpty()) {
                 out.println("    final Node result = instance;");
             } else {
-                if (processingEnv.getTypeUtils().isAssignable(componentClass.asType(), parent)) {
-                    out.println("    instance.getChildren().clear();");
-                }
+                generateClearChildren(out, componentClass);
                 out.printf("    final Node result = this.controllerManager.loadFXML(%s, instance, true);%n", helper.stringLiteral(view));
             }
         } else if (controller != null) {
@@ -319,6 +322,14 @@ private void generateRenderResult(PrintWriter out, TypeElement componentClass) {
         }
     }
 
+    private void generateClearChildren(PrintWriter out, TypeElement componentClass) {
+        if (processingEnv.getTypeUtils().isAssignable(componentClass.asType(), pane)) {
+            out.println("    instance.getChildren().clear();");
+        } else if (processingEnv.getTypeUtils().isAssignable(componentClass.asType(), parent)) {
+            out.println("    org.fulib.fx.util.ReflectionUtil.getChildrenList(instance.getClass(), instance).clear();");
+        }
+    }
+
     private void generateCallRenderMethods(PrintWriter out, TypeElement componentClass) {
         helper.streamAllMethods(componentClass, OnRender.class)
             .sorted(Comparator.comparingInt(a -> a.getAnnotation(OnRender.class).value()))

framework/src/main/java/org/fulib/fx/controller/internal/ReflectionSidecar.java

@@ -7,6 +7,7 @@
 import javafx.scene.Parent;
 import javafx.scene.input.KeyCode;
 import javafx.scene.input.KeyEvent;
+import javafx.scene.layout.Pane;
 import org.fulib.fx.FulibFxApp;
 import org.fulib.fx.annotation.controller.*;
 import org.fulib.fx.annotation.event.OnDestroy;
@@ -370,10 +371,7 @@ private Node renderNode(T instance, boolean component) {
                 node = (Node) instance;
             } else {
                 Node root = (Node) instance;
-                // Due to the way JavaFX works, we have to clear the children list of the old root before loading its fxml file again
-                if (root instanceof Parent parent) {
-                    ReflectionUtil.getChildrenList(instance.getClass(), parent).clear();
-                }
+                clearChildren(root);
                 node = controllerManager.loadFXML(view, instance, true);
             }
         }
@@ -406,6 +404,15 @@ else if (view.startsWith("#")) {
         return node;
     }
 
+    private void clearChildren(Node node) {
+        // Due to the way JavaFX works, we have to clear the children list of the old root before loading its fxml file again
+        if (node instanceof Pane pane) {
+            pane.getChildren().clear();
+        } else if (node instanceof Parent parent) {
+            ReflectionUtil.getChildrenList(node.getClass(), parent).clear();
+        }
+    }
+
     /**
      * Registers all key events for the given controller instance.
      *

framework/src/test/java/org/fulib/fx/app/controller/types/ListViewComponent.java

@@ -0,0 +1,9 @@
+package org.fulib.fx.app.controller.types;
+
+import javafx.scene.control.ListView;
+import org.fulib.fx.annotation.controller.Component;
+
+// https://github.com/fujaba/fulibFx/issues/113
+@Component(view = "ListView.fxml")
+public class ListViewComponent<T> extends ListView<T> {
+}

framework/src/test/resources/org/fulib/fx/app/controller/types/ListView.fxml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+
+<?import javafx.scene.control.ListView?>
+<fx:root type="ListView" prefHeight="200.0" prefWidth="200.0" xmlns="http://javafx.com/javafx/22"
+         xmlns:fx="http://javafx.com/fxml/1"/>