Added JavaFX demo app for ListView CellFactory (#11133)

* Added JavaFX demo app for ListView CellFactory

* Moved to the common project

javafx/src/main/java/com/baeldung/listview/ExampleController.java

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+package com.baeldung.listview;
+
+import com.baeldung.listview.cellfactory.CheckboxCellFactory;
+import com.baeldung.listview.cellfactory.PersonCellFactory;
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+import javafx.fxml.FXML;
+import javafx.fxml.Initializable;
+import javafx.scene.control.ListView;
+
+import java.net.URL;
+import java.util.ResourceBundle;
+
+public class ExampleController implements Initializable {
+    @FXML
+    private ListView<Person> listView;
+
+    @Override
+    public void initialize(URL location, ResourceBundle resources) {
+        ObservableList<Person> wordsList = FXCollections.observableArrayList();
+        wordsList.add(new Person("Isaac", "Newton"));
+        wordsList.add(new Person("Albert", "Einstein"));
+        wordsList.add(new Person("Ludwig", "Boltzmann"));
+        listView.setItems(wordsList);
+    }
+
+    public void defaultButtonClick() {
+        listView.setCellFactory(null);
+    }
+
+    public void cellFactoryButtonClick() {
+        listView.setCellFactory(new PersonCellFactory());
+    }
+
+    public void checkboxCellFactoryButtonClick() {
+        listView.setCellFactory(new CheckboxCellFactory());
+    }
+}

javafx/src/main/java/com/baeldung/listview/Main.java

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+package com.baeldung.javafx.listview;
+
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Parent;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+
+import java.net.URL;
+
+public class Main extends Application {
+
+    public static void main(String args[]) {
+        launch(args);
+    }
+
+    @Override
+    public void start(Stage primaryStage) throws Exception {
+        FXMLLoader loader = new FXMLLoader();
+        URL xmlUrl = getClass().getResource("/example.fxml");
+        loader.setLocation(xmlUrl);
+        Parent root = loader.load();
+
+        primaryStage.setTitle("List View Demo");
+        primaryStage.setScene(new Scene(root));
+        primaryStage.show();
+    }
+}

javafx/src/main/java/com/baeldung/listview/Person.java

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+package com.baeldung.listview;
+
+public class Person {
+
+    private final String firstName;
+    private final String lastName;
+
+    public Person(String firstName, String lastName) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    @Override
+    public String toString() {
+        return firstName + " " + lastName;
+    }
+}

javafx/src/main/java/com/baeldung/listview/cellfactory/CheckboxCellFactory.java

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+package com.baeldung.listview.cellfactory;
+
+import com.baeldung.listview.Person;
+import javafx.scene.control.CheckBox;
+import javafx.scene.control.ListCell;
+import javafx.scene.control.ListView;
+import javafx.util.Callback;
+
+public class CheckboxCellFactory implements Callback<ListView<Person>, ListCell<Person>> {
+    @Override
+    public ListCell<Person> call(ListView<Person> param) {
+        return new ListCell<Person>(){
+            @Override
+            public void updateItem(Person person, boolean empty) {
+                super.updateItem(person, empty);
+                if (empty) {
+                    setText(null);
+                    setGraphic(null);
+                } else if (person != null) {
+                    setText(null);
+                    setGraphic(new CheckBox(person.getFirstName() + " " + person.getLastName()));
+                } else {
+                    setText("null");
+                    setGraphic(null);
+                }
+            }
+        };
+    }
+}

javafx/src/main/java/com/baeldung/listview/cellfactory/PersonCellFactory.java

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+package com.baeldung.listview.cellfactory;
+
+import com.baeldung.listview.Person;
+import javafx.scene.control.ListCell;
+import javafx.scene.control.ListView;
+import javafx.util.Callback;
+
+public class PersonCellFactory implements Callback<ListView<Person>, ListCell<Person>> {
+    @Override
+    public ListCell<Person> call(ListView<Person> param) {
+        return new ListCell<Person>(){
+            @Override
+            public void updateItem(Person person, boolean empty) {
+                super.updateItem(person, empty);
+                if (empty || person == null) {
+                    setText(null);
+                } else {
+                    setText(person.getFirstName() + " " + person.getLastName());
+                }
+            }
+        };
+    }
+}

javafx/src/main/resources/example.fxml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.ListView?>
+<?import javafx.scene.layout.AnchorPane?>
+
+<AnchorPane prefHeight="188.0" prefWidth="457.0" xmlns="http://javafx.com/javafx/8.0.172-ea" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.baeldung.listview.ExampleController">
+   <children>
+      <ListView id="listView" fx:id="listView" layoutX="14.0" layoutY="25.0" prefHeight="138.0" prefWidth="256.0" />
+      <Button layoutX="283.0" layoutY="25.0" mnemonicParsing="false" onAction="#defaultButtonClick" prefHeight="25.0" prefWidth="139.0" text="Default" />
+      <Button layoutX="283.0" layoutY="63.0" mnemonicParsing="false" onAction="#cellFactoryButtonClick" prefHeight="25.0" prefWidth="139.0" text="Cell Factory" />
+      <Button layoutX="283.0" layoutY="104.0" mnemonicParsing="false" onAction="#checkboxCellFactoryButtonClick" prefHeight="25.0" prefWidth="139.0" text="Checkbox Cell Factory" />
+   </children>
+</AnchorPane>