I have been using Python and tkinter. I am now learning JavaFXML. I am having an issue accessing objects through controllers. I have a class named User. I create a User in my main Java class, the one that extends Application. The user has a location X and a location Y. When I push a button, I want to change the location of my user. I accomplish this easily when using JavaFX without FXML since everything is declared in the same class. But when I use FXML, I am dealing with a controller class which has no idea about the User class since I called it in my main class. I tried to initiate the User class in the controller, it seemed silly and didnt work. I also tried to search for a way to pass the user object to the controller but could not find a page on how to. Here is the code:
main class:
package simx;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class SimX extends Application {
User user;
World world;
Human human;
public SimX() {
}
@Override
public void start(Stage stage) throws Exception {
user = new User(10, 10);
Parent root = FXMLLoader.load(getClass().getResource("UIFXML.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
public static void main(String[] args) {
launch(args);
}
}
my FXML:
<?import javafx.scene.text.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane id="AnchorPane" prefHeight="480.0" prefWidth="640.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="simx.UIFXMLController">
<children>
<GridPane layoutX="6.0" prefHeight="480.0" prefWidth="640.0">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<GridPane prefHeight="121.0" prefWidth="193.0" GridPane.columnSpan="2" GridPane.rowSpan="2">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Button fx:id="moveEastButton" layoutX="10.0" layoutY="38.0" onAction="#handleMoveEastButtonAction" prefHeight="25.0" prefWidth="500.0" text="Move East" GridPane.columnIndex="2" GridPane.rowIndex="1" />
<Button fx:id="moveSouthButton" layoutX="10.0" layoutY="38.0" onAction="#handleMoveSouthButtonAction" prefHeight="25.0" prefWidth="500.0" text="Move South" GridPane.columnIndex="1" GridPane.rowIndex="2" />
<Button fx:id="moveWestButton" layoutX="10.0" layoutY="38.0" onAction="#handleMoveWestButtonAction" prefHeight="25.0" prefWidth="500.0" text="Move West" GridPane.rowIndex="1" />
<Label alignment="CENTER" prefHeight="17.0" prefWidth="169.0" text="(X,Y)" GridPane.columnIndex="1" GridPane.rowIndex="1">
<font>
<Font size="24.0" />
</font>
</Label>
<Button fx:id="moveNorthButton" onAction="#handleMoveNorthButtonAction" prefHeight="25.0" prefWidth="500.0" text="Move North" GridPane.columnIndex="1" />
</children>
</GridPane>
</children>
</GridPane>
</children>
</AnchorPane>
and my controller: /*
package simx;
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;
public class UIFXMLController implements Initializable {
@FXML
private Button moveNorthButton;
@FXML
private void handleMoveNorthButtonAction(ActionEvent event) {
System.out.println("Move North");
user.moveNorth();
}
@FXML
private Button moveSouthButton;
@FXML
private void handleMoveSouthButtonAction(ActionEvent event) {
System.out.println("Move South");
}
@FXML
private Button moveEastButton;
@FXML
private void handleMoveEastButtonAction(ActionEvent event) {
System.out.println("Move East");
}
@FXML
private Button moveWestButton;
@FXML
private void handleMoveWestButtonAction(ActionEvent event) {
System.out.println("Move West");
}
@Override
public void initialize(URL url, ResourceBundle rb) {
}
}
I dont think I need to show the User class.
