Develop Reference

Editing Text Area within Controller

I am new to Java and JavaFX. I've created a JavaFX project using SceneBuilder/FXML and I'm attempting to add a realtime clock at the start of the program which works throughout the whole program at the top of the screen. I created a text area and tried to add the clock function from the code we were given but every time I start the program, it always shows up blank. Even doing trying to just use the .setText("string") function manually doesn't work so I think I'm putting the code in the wrong place. If possible, can someone tell me where this code should go or point me in the correct direction?
Here is my main:
package application;
import java.lang.ModuleLayer.Controller;
import java.util.Date;
import javafx.application.Application;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
public class Main extends Application {
public static Stage stage = null;
#Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("/Ui.fxml"));
Scene scene = new Scene(root);
stage.initStyle(StageStyle.UNDECORATED);
stage.setScene(scene);
this.stage = stage;
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Here is my controller code:
package application;
import java.util.Date;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.control.TextArea;
public class UiController {
#FXML
private TextArea clockTextArea;
#FXML
private TextArea transactionLog;
#FXML
private TextField recipentField;
#FXML
private Button payButton;
#FXML
private Button requestButton;
#FXML
private TextField commentField;
private void refreshClock()
{
Thread refreshClock = new Thread()
{
public void run()
{
while (true)
{
Date dte = new Date();
String topMenuStr = " " + dte.toString();
clockTextArea.setText(topMenuStr);
try
{
sleep(3000L);
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
} // end while ( true )
} // end run thread
};
refreshClock.start();
}
public void initialize() {
TextArea clockTextArea = new TextArea();
refreshClock();
}
}

It should be noted that whether it is in Swing or JavaFX, when updating the control, it needs to be done in the event dispatching thread, EDT, otherwise it will not work or throw Exception Not on FX application thread; currentThread = *
At this time, you only need to place the code of the update control code in the event dispatch thread for completion. Use the following code in JavaFX
Platform.runLater(new Runnable() {
#Override
public void run() {
//Update the control code of JavaFX and put it here
}
});
So change your code:
Date dte = new Date();
String topMenuStr = " " + dte.toString();
Platform.runLater(() -> clockTextArea.setText(topMenuStr));
and check if it works.

One route is to use Timeline to handle the clock. It's will be independent of your other code.
Main
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.stage.Stage;
import java.io.IOException;
/**
* JavaFX App
*/
public class App extends Application {
#Override
public void start(Stage stage) {
try {
FXMLLoader fxmlLoader = new FXMLLoader(App.class.getResource("primary.fxml"));
Scene scene = new Scene(fxmlLoader.load(), 1080, 720);
stage.setScene(scene);
stage.show();
} catch (IOException ex) {
System.out.println(ex.toString());
}
}
public static void main(String[] args) {
launch();
}
}
PrimaryController
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Label;
import javafx.util.Duration;
public class PrimaryController {
#FXML Label lblClock;
Timeline clockHandler;
#FXML
void initialize()
{
Locale locale_en_US = Locale.US ;
DateTimeFormatter formatterUS = DateTimeFormatter.ofLocalizedTime( FormatStyle.SHORT ).withLocale( locale_en_US ) ;
clockHandler = new Timeline(
new KeyFrame(Duration.seconds(1), (ActionEvent event) -> {
LocalTime currentTime = LocalTime.now();
String outputUs = currentTime.format(formatterUS);
lblClock.setText(outputUs);
}));
clockHandler.setCycleCount(Timeline.INDEFINITE);
clockHandler.play();
}
}
Primary FXML
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Menu?>
<?import javafx.scene.control.MenuBar?>
<?import javafx.scene.control.MenuItem?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<VBox alignment="TOP_CENTER" prefHeight="720.0" prefWidth="1080.0" xmlns="http://javafx.com/javafx/15.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sed.home.javafxrealtimeclock.PrimaryController">
<children>
<MenuBar>
<menus>
<Menu mnemonicParsing="false" text="File">
<items>
<MenuItem mnemonicParsing="false" text="Close" />
</items>
</Menu>
<Menu mnemonicParsing="false" text="Edit">
<items>
<MenuItem mnemonicParsing="false" text="Delete" />
</items>
</Menu>
<Menu mnemonicParsing="false" text="Help">
<items>
<MenuItem mnemonicParsing="false" text="About" />
</items>
</Menu>
</menus>
</MenuBar>
<HBox>
<children>
<Label maxWidth="1.7976931348623157E308" HBox.hgrow="ALWAYS" />
<Label fx:id="lblClock" text="00:00">
<HBox.margin>
<Insets />
</HBox.margin>
</Label>
</children>
<VBox.margin>
<Insets left="5.0" right="5.0" />
</VBox.margin>
</HBox>
<AnchorPane prefHeight="200.0" prefWidth="200.0" VBox.vgrow="ALWAYS">
<children>
<Label layoutX="451.0" layoutY="331.0" text="The other parts of the program here" />
</children>
</AnchorPane>
</children>
</VBox>

How to transfer a container from one window to another in JavaFX

I got a Button called "Transfer" with the onclick method and a VBox with 3 Buttons in one window.
The second window only has a HBox container.
I wanna understand how to send the VBox to the HBox in the other window by pressing the transfer Button.
And what would also help is feedback regarding my code/file organization.
Main Class:
package testproject;
import javafx.application.Application;
import testproject.screen1.Screen1;
import testproject.screen2.Screen2;
import javafx.stage.Stage;
public class Main extends Application {
private Screen1 screen1;
private Screen2 screen2;
#Override
public void start(Stage primaryStage) throws Exception{
screen1 = new Screen1(this, new Stage());
screen2 = new Screen2(this, primaryStage);
}
public static void main(String[] args) {
Application.launch(args);
}
}
Screen1 Class:
package testproject.screen1;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import testproject.Main;
import java.io.IOException;
public class Screen1 {
public Screen1(Main main, Stage stage){
FXMLLoader loader = new FXMLLoader();
try {
Parent root =
loader.load(getClass().getResourceAsStream("/testproject/screen1/screen1.fxml"));
stage.setTitle("Screen 1");
stage.setScene(new Scene(root, 300, 275));
}
catch (IOException e) {
e.printStackTrace();
}
stage.show();
}
}
Screen2 Class:
package testproject.screen2;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import testproject.Main;
import java.io.IOException;
public class Screen2 {
public Screen2(Main main, Stage stage) {
FXMLLoader loader = new FXMLLoader();
try {
Parent root =
loader.load(getClass().getResourceAsStream("/testproject/screen2/screen2.fxml"));
stage.setTitle("Screen 2");
stage.setScene(new Scene(root, 300, 275));
}
catch (IOException e) {
e.printStackTrace();
}
stage.show();
}
}
Screen1Controller Class:
package testproject.screen1;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.VBox;
public class Screen1Controller {
#FXML
private AnchorPane Pane1;
#FXML
private VBox VBoxScreen1;
#FXML
private Button TransferButton;
#FXML
void transferToScreen2(MouseEvent event){
}
}
Screen2Controller Class:
package testproject.screen2;
import javafx.fxml.FXML;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.HBox;
public class Screen2Controller {
#FXML
private AnchorPane Pane2;
#FXML
private HBox HBoxScreen2;
}

One way I can think of is to pass a callback/consumer to the screen2 controller to let it know what to do with its node. Having said that, there can be many other approaches to this requirement.
As per my view, you dont need separate classes to load the screens. You can check the below working demo.
Main.java
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class Main extends Application {
#Override
public void start(Stage primaryStage) throws Exception {
FXMLLoader loader2 = new FXMLLoader(getClass() .getResource("screen2.fxml"));
VBox screen2 = loader2.load();
Screen2Controller screen2Controller = loader2.getController();
Stage screen2Stage = new Stage();
Scene scene2 = new Scene(screen2);
screen2Stage.setScene(scene2);
screen2Stage.setTitle("Screen 2");
screen2Stage.setX(900);
screen2Stage.setY(100);
screen2Stage.show();
FXMLLoader loader1 = new FXMLLoader(getClass() .getResource("screen1.fxml"));
VBox screen1 = loader1.load();
Screen1Controller screen1Controller = loader1.getController();
// Set a consumer to the screen1 to let it know what to do
screen1Controller.setTransferer(screen2Controller::moveNode);
Scene scene1 = new Scene(screen1);
primaryStage.setScene(scene1);
primaryStage.setTitle("Screen 1");
primaryStage.setX(100);
primaryStage.setY(100);
primaryStage.show();
}
public static void main(String[] args) {
Application.launch(args);
}
}
Screen1Controller.java
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.Node;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import java.util.function.Consumer;
public class Screen1Controller {
#FXML
private VBox pane1;
#FXML
private VBox vBoxScreen1;
#FXML
private Button transferButton;
private Consumer<Node> transferer;
#FXML
void transferToScreen2(ActionEvent event) {
// First remove the node from the parent.
pane1.getChildren().remove(vBoxScreen1);
// Then send the node to do the other operation.
this.transferer.accept(vBoxScreen1);
}
public void setTransferer(Consumer<Node> transferer) {
this.transferer = transferer;
}
}
screen1.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.geometry.Insets?>
<VBox fx:id="pane1" xmlns="http://javafx.com/javafx"
xmlns:fx="http://javafx.com/fxml"
fx:controller="com.stackoverflow.javafx.issue7.Screen1Controller"
prefHeight="400.0" prefWidth="600.0" spacing="10">
<children>
<VBox fx:id="vBoxScreen1" spacing="10" style="-fx-border-width:2px;-fx-border-color:red;-fx-background-color:yellow;" prefWidth="200" maxWidth="200" prefHeight="200">
<children>
<Button text="Button 1"/>
<Button text="Button 2"/>
<Button text="Button 3"/>
</children>
<padding>
<Insets topRightBottomLeft="10" />
</padding>
</VBox>
<Button fx:id="transferButton" text="Transfer" onAction="#transferToScreen2"/>
</children>
<padding>
<Insets topRightBottomLeft="10" />
</padding>
</VBox>
Screen2Controller.java
import javafx.fxml.FXML;
import javafx.scene.Node;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
public class Screen2Controller {
#FXML
private VBox pane2;
#FXML
private HBox hBoxScreen2;
public void moveNode(Node node){
hBoxScreen2.getChildren().add(node);
}
}
screen2.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.layout.*?>
<?import javafx.geometry.Insets?>
<VBox fx:id="pane2" xmlns="http://javafx.com/javafx"
xmlns:fx="http://javafx.com/fxml"
fx:controller="com.stackoverflow.javafx.issue7.Screen2Controller"
prefHeight="400.0" prefWidth="600.0" spacing="10">
<children>
<HBox fx:id="hBoxScreen2" spacing="10">
<padding>
<Insets topRightBottomLeft="10" />
</padding>
</HBox>
</children>
<padding>
<Insets topRightBottomLeft="10" />
</padding>
</VBox>

Adding dynamic buttons on GridPane FXML JavaFX

I've started a project requested by our instructor building an application in JavaFX.
I used SceneBuilder for FXML Part when I want to add buttons on gridpane, but it didn't work. The connection with the database is okay. On the first part of the application, the user logs in. After that he/she comes on UserWindow, but the buttons aren't displayed.
File Main.java:
package sample;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
Stage window;
Controller c;
ControllerB cB;
#Override
public void start(Stage primaryStage) throws Exception {
window = primaryStage;
FXMLLoader f = new FXMLLoader();
FXMLLoader f2 = new FXMLLoader();
f.setLocation(Main.class.getResource("sample.fxml"));
f2.setLocation(Main.class.getResource("UserWindow.fxml"));
Parent root = f.load();
Parent root2 = f2.load();
Scene s = new Scene(root, 500, 340);
// Controllers
c = f.getController();
c.setMain(this);
c.setScene2(new Scene(root2, 900, 500));
cB = f2.getController();
cB.setMain(this);
cB.setScene(s);
window.setTitle("Remote Works");
window.setScene(s);
window.show();
}
public static void main(String[] args) {
launch(args);
}
public void setUserData(Object o) {
window.setUserData(o);
}
public void setScene(Scene scene) {
window.setScene(scene);
window.show();
}
public void setScene2(Scene scene) {
window.setScene(scene);
window.show();
}
}
File ControllerB.java:
package sample;
import javafx.collections.*;
import javafx.event.ActionEvent;
import javafx.fxml.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.layout.GridPane;
import java.io.IOException;
import java.net.URL;
import java.sql.*;
import java.util.*;
public class ControllerB implements Initializable {
#FXML
private GridPane Box;
#FXML
private Label nameUser;
#FXML
private Label matriculeUser;
#FXML
private Label fonctionUser;
#FXML
private Button deconnect;
private Scene scene1;
private Main main;
ObservableList<String> ecoles;
#Override
public void initialize(URL url, ResourceBundle resourceBundle) {
try {
schoolretrieve();
int size = ecoles.size();
Node[] n = new Node[size];
for (int i = 0; i < n.length; i++) {
FXMLLoader loader = new FXMLLoader(getClass().getResource("Bloc.fxml"));
ControllerItem controller = new ControllerItem();
loader.setController(controller);
n[i] = loader.load();
controller.setButtonInst(ecoles.get(i)); // Until this part all works
Box.getChildren().add(n[i]); // But it doesn't add buttons to GridPane
}
} catch (IOException | NullPointerException | SQLException e) {
//System.out.println(e.getMessage());
e.printStackTrace();
}
}
}
File ControllerItem.java:
package sample;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
public class ControllerItem {
#FXML
private Button buttonInst;
public Button getButtonInst() {
return buttonInst;
}
public void setButtonInst(String s) {
buttonInst.setText(s);
}
}
File Bloc.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<Button fx:id="buttonInst" mnemonicParsing="false" prefHeight="132.0" prefWidth="201.0" stylesheets="#../styles.css" xmlns="http://javafx.com/javafx/10.0.2-internal" xmlns:fx="http://javafx.com/fxml/1" />
File UserWindow.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.image.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.shape.*?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="497.0" prefWidth="710.0" styleClass="pane" stylesheets="#../styles.css" xmlns="http://javafx.com/javafx/10.0.2-internal" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.ControllerB">
<left>
<Pane prefHeight="497.0" prefWidth="156.0" BorderPane.alignment="CENTER">
<children>
<ImageView fitHeight="150.0" fitWidth="151.0" layoutX="11.0" pickOnBounds="true" preserveRatio="true" />
<Circle fill="#e1ebf5" layoutX="78.0" layoutY="88.0" opacity="0.18" radius="74.0" stroke="BLACK" strokeType="INSIDE" />
<Label fx:id="nameUser" layoutX="10.0" layoutY="196.0" prefHeight="50.0" prefWidth="136.0" text="Nom Utilisateur :" />
<Label fx:id="fonctionUser" layoutX="11.0" layoutY="259.0" prefHeight="37.0" prefWidth="136.0" text="Statut : " />
<Label fx:id="matriculeUser" layoutX="10.0" layoutY="306.0" prefHeight="37.0" prefWidth="136.0" text="Identifiant : " />
<Button fx:id="deconnect" layoutX="20.0" layoutY="364.0" mnemonicParsing="false" onAction="#onAction" prefHeight="27.0" prefWidth="117.0" text="deconnexion" />
</children>
</Pane>
</left>
<center>
<Pane opacity="0.0" prefHeight="200.0" prefWidth="200.0" style="-fx-background-color: #f7cc3d;"
BorderPane.alignment="CENTER">
<GridPane fx:id="Box" alignment="TOP_CENTER" hgap="3.0" layoutX="70.0" layoutY="96.0"
nodeOrientation="LEFT_TO_RIGHT" opacity="0.95" prefHeight="305.0" prefWidth="415.0"
styleClass="gridpane" stylesheets="#../ss.css" vgap="3.0"/>
</Pane>
</center>
</BorderPane>

So you have file UserWindow.fxml and you have declared a GridPane in it. I suggest you to don't make a separate .fxml file for the button.
Just do it like this in your ControllerB:
#Override
public void initialize(URL url, ResourceBundle resourceBundle) {
schoolretrieve();
int size = ecoles.size();
//Node[] n = new Node[size];
for (int i = 0; i < size; i++) {
//FXMLLoader loader = new FXMLLoader(getClass().getResource("Bloc.fxml"));
//ControllerItem controller = new ControllerItem();
//loader.setController(controller);
//n[i] = loader.load();
//controller.setButtonInst(ecoles.get(i));
//Box.getChildren().add(n[i]);
Button btn = new Button(ecoles.get(i));
Box.add(btn, 0, i); // Button is added to next row every time.
}
}

Java Fx, Edit the textarea of a specific tab

Well, my question is simple.
I am building an application with Java Fx, and I have a TabPane.
When I open a new Tab, that Tab gets it's content by a fxml file.
tab.setContent((Node)FXMLLoader.load(this.getClass().getResource("/main/textEditor.fxml")))
Fine, that works well, it always loads the same file on all Tabs, so, all textarea on all tabs have the same id.
The problem is, with java, I can only get the information of the textarea of the first Tab.
How can i edit specifically the textarea of one tab in particular?
An example of what i want to do :
Main
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.geometry.Rectangle2D;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Screen;
import javafx.stage.Stage;
public class Main extends Application{
public static void main(String[] args) {
Application.launch(Main.class, args);
}
#Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("/tabPane/test.fxml"));
Screen screen = Screen.getPrimary();
Rectangle2D bounds = screen.getVisualBounds();
stage.setScene(new Scene(root));
stage.show();
}
}
test.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.net.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.text.*?>
<?import javafx.scene.layout.AnchorPane?>
<VBox prefHeight="400.0" prefWidth="640.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="tabPane.controller">
<children>
<MenuBar VBox.vgrow="NEVER">
<menus>
<Menu mnemonicParsing="false" onAction="#test" text="File">
<items>
<MenuItem fx:id="insert" mnemonicParsing="false" onAction="#test" text="Insert" />
</items>
</Menu>
</menus>
</MenuBar>
<AnchorPane maxHeight="-1.0" maxWidth="-1.0" prefHeight="-1.0" prefWidth="-1.0" VBox.vgrow="ALWAYS">
<children>
<Label alignment="CENTER" layoutX="155.0" layoutY="177.0" style="
" text="Drag components from Library here…" textAlignment="CENTER" textFill="#9f9f9f" wrapText="false">
<font>
<Font size="18.0" />
</font>
</Label>
<TabPane fx:id="tabPane" prefHeight="375.0" prefWidth="640.0" tabClosingPolicy="UNAVAILABLE">
<tabs>
<Tab text="Untitled Tab 1">
<content>
<TextArea fx:id="textarea" prefHeight="200.0" prefWidth="200.0" text="a" />
</content>
</Tab>
<Tab text="Untitled Tab 2">
<content>
<TextArea fx:id="textarea1" prefHeight="200.0" prefWidth="200.0" text="a" />
</content>
</Tab>
</tabs>
</TabPane>
</children>
</AnchorPane>
</children>
<stylesheets>
<URL value="#../../../../BasicApplicatio11n_css/BasicApplication.css" />
controller.java
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.TextArea;
public class controller implements Initializable{
#FXML
private TextArea textarea;
#Override
public void initialize(URL arg0, ResourceBundle arg1) {
}
public void test(ActionEvent event){
textarea.appendText("Text");
}
}
There are two tabs on this example, when the button is pressed, I want to add the text on the current selected tab.

There are a few different ways to do this. One way is to let the controller for the tab content expose the textProperty from the text area. Then in your "main controller", create a StringProperty field. When you create a new tab, just observe its selected property and update the string property field to point to the one from the current controller. Then you can easily load text into the "current" pane.
Here's a simple example of this:
EditorController:
import javafx.beans.property.StringProperty;
import javafx.fxml.FXML;
import javafx.scene.control.TextArea;
public class EditorController {
#FXML
private TextArea textArea ;
public StringProperty textProperty() {
return textArea.textProperty() ;
}
}
with textEditor.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.control.TextArea?>
<BorderPane xmlns:fx="http://javafx.com/fxml/1" fx:controller="EditorController">
<center>
<TextArea fx:id="textArea"/>
</center>
</BorderPane>
And then the MainController could look like:
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import javafx.beans.property.StringProperty;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.Tab;
import javafx.scene.control.TabPane;
import javafx.stage.FileChooser;
public class MainController {
#FXML
private TabPane tabPane ;
private StringProperty currentText ;
public void initialize() throws IOException {
// load an initial tab:
newTab();
}
#FXML
private void newTab() throws IOException {
Tab tab = new Tab("Untitled text");
FXMLLoader loader = new FXMLLoader(getClass().getResource("textEditor.fxml"));
tab.setContent(loader.load());
EditorController controller = loader.getController() ;
tab.selectedProperty().addListener((obs, wasSelected, isNowSelected) -> {
if (isNowSelected) {
currentText = controller.textProperty();
}
});
tabPane.getTabs().add(tab);
tabPane.getSelectionModel().select(tab);
}
#FXML
private void load() {
FileChooser chooser = new FileChooser();
File file = chooser.showOpenDialog(tabPane.getScene().getWindow());
if (file != null) {
Path path = file.toPath();
try {
currentText.set(String.join("\n", Files.readAllLines(path)));
} catch (IOException e) {
Alert alert = new Alert(AlertType.ERROR);
alert.setContentText("Unable to load file "+path);
alert.setTitle("Load error");
alert.showAndWait();
}
tabPane.getSelectionModel().getSelectedItem().setText(path.getFileName().toString());
}
}
}
with main.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.control.TabPane?>
<?import javafx.scene.control.Button?>
<?import javafx.geometry.Insets?>
<BorderPane xmlns:fx="http://javafx.com/fxml/1" fx:controller="MainController">
<center>
<TabPane fx:id="tabPane"/>
</center>
<bottom>
<HBox alignment="CENTER" spacing="5">
<padding>
<Insets top="5" right="5" left="5" bottom="5" />
</padding>
<Button text="Load..." onAction="#load" />
<Button text="New" onAction="#newTab"/>
</HBox>
</bottom>
</BorderPane>
For completeness, a simple application class:
import java.io.IOException;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
#Override
public void start(Stage primaryStage) throws IOException {
Parent root = FXMLLoader.load(getClass().getResource("main.fxml"));
Scene scene = new Scene(root, 800, 800);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
There are other approaches, e.g. you could just change the button's onAction property when the tab selection changes, etc.

JAVA FXML create a tree with custom check boxes

I am trying to create a tree with custom check boxes. There is no option in the Scenebuilder with such an option. I tried to write the code in the controller, but did not work.
Someone please help me out.
FXML and the controller code:
the CheckBoxTreeItem is not working.
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane prefHeight="486.9609375" prefWidth="472.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/2.2" fx:controller="abcd.controller">
<!-- TODO Add Nodes -->
<children>
<Button id="button" fx:id="button1" layoutX="99.0" layoutY="51.0" mnemonicParsing="false" onAction="#processLogin" text="Button" />
<TextArea fx:id="textarea" layoutX="40.0" layoutY="83.0" prefHeight="76.0" prefWidth="129.0" wrapText="true" />
<TreeView fx:id="treeview" layoutX="69.0" layoutY="204.0" prefHeight="200.0" prefWidth="200.0" />
</children>
</AnchorPane>
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBoxTreeItem;
import javafx.scene.control.CheckBoxTreeItemBuilder;
import javafx.scene.control.TextArea;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.control.cell.CheckBoxTreeCell;
import javafx.util.Callback;
public class controller implements Initializable {
// Binding with the FXML
#FXML
private Button taskBarButton1;
#FXML private TextArea textarea;
#FXML private TreeView<String> treeview;
#FXML private CheckBoxTreeItem<String> root;
//#FXML private CheckBoxTreeItem<String> rootitem ;
#FXML
private void processLogin(ActionEvent event) {
textarea.appendText("clicked");
}
public void loadonstart()
{
for (int i=0; i<5;i++)
{
//System.out.println("numbers" +i);
textarea.appendText("\n"+i);
}
}
#Override
public void initialize(URL location, ResourceBundle resources) {
loadonstart();
loadtreeitems();
}
private void loadtreeitems()
{
CheckBoxTreeItem<String> root = new CheckBoxTreeItem<String>("Source Root");
root.setExpanded(true);
TreeView<String> tree = new TreeView<String> (root);
//tree.setCellFactory(CheckBoxTreeCell.<String>forTreeView());
for (int j=10; j<15; j++)
{
root.setExpanded(true);
root.getChildren().add(new CheckBoxTreeItem<String>("" +j));
}
treeview.setRoot(root);
}
}