java - JavaFXは、別のクラスからペインの色を変更します

Question

質問があります。ペインの色を別のコントローラ クラスから変更したいと考えています。私はこのコードを使用しています：

FXMLLoader loader = new FXMLLoader(getClass().getResource("/fxml/Menu.fxml"));
    try {
        Parent loaded = (Parent) loader.load();
    } catch (IOException e) {
        e.printStackTrace();
    }
    MenuController controller = (MenuController) loader.getController();
    Platform.runLater(new Runnable() {
        @Override
        public void run() {
            Pane pane = controller.getRedPane();
            pane.setBackground(new Background(new BackgroundFill(Color.BLUE, CornerRadii.EMPTY, Insets.EMPTY)));
        }
    });

ロード済み、コントローラー、およびペインが null ではありません。しかし、ペインの色は変わりません。誰かがこの問題を手伝ってくれますか? どうもありがとうございました。

[編集]

public class MenuController implements Initializable
{
    @FXML
    private GridPane MenuRoot;

    @FXML
    private Pane redPane;


    @Override
    public void initialize(URL location, ResourceBundle resources)
    {

    }

   @FXML
   private void changeGridSize(ActionEvent event){
       new ChangeSizes();
   }

    public GridPane getMenuRoot(){
        return this.MenuRoot;
    }

    public Pane getRedPane(){
        return this.redPane;
    }
}

[編集]

<?import java.lang.*?>
<?import javafx.scene.layout.*?>

<GridPane fx:id="MenuRoot" gridLinesVisible="true" maxHeight="1.7976931348623157E308"      maxWidth="1.7976931348623157E308" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1"     fx:controller="nl.voxworks.homeserver.client.MenuController">
  <columnConstraints>
  <ColumnConstraints hgrow="ALWAYS" maxWidth="1.7976931348623157E308" minWidth="0.0" percentWidth="50.0" />
  <ColumnConstraints hgrow="ALWAYS" maxWidth="1.7976931348623157E308" minWidth="0.0" percentWidth="50.0" />
  </columnConstraints>
  <rowConstraints>
    <RowConstraints maxHeight="1.7976931348623157E308" minHeight="0.0" percentHeight="50.0" vgrow="ALWAYS" />
    <RowConstraints maxHeight="1.7976931348623157E308" minHeight="0.0" percentHeight="50.0" vgrow="ALWAYS" />
    </rowConstraints>
   <children>
      <Pane fx:id="redPane" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="0.0" minWidth="0.0" prefHeight="200.0" prefWidth="200.0" style="-fx-background-color: red;" GridPane.rowIndex="1" />
      <Pane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="0.0" minWidth="0.0" prefHeight="200.0" prefWidth="200.0" style="-fx-background-color: black;" GridPane.columnIndex="1" GridPane.rowIndex="1" />
   </children>
</GridPane>

[編集] (別のプロジェクトに含まれるすべてのファイル) package javafxapplication16;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Platform;
import javafx.fxml.FXMLLoader;
import javafx.geometry.Insets;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.Pane; 
import javafx.scene.paint.Color;

public class ChangeSize {

public ChangeSize(){
    FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));
    try {
        loader.load();
    } catch (IOException ex) {
        Logger.getLogger(ChangeSize.class.getName()).log(Level.SEVERE, null, ex);
    }
    FXMLDocumentController controller = (FXMLDocumentController) loader.getController();

    Platform.runLater(new Runnable() {
        @Override
        public void run() {
             Pane pane = controller.getPane();
            pane.setBackground(new Background(new BackgroundFill(Color.BLUE, CornerRadii.EMPTY, Insets.EMPTY)));
        }
    });
    }
}

FXMLDocumentController.

package javafxapplication16;

import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
import javafx.scene.layout.Pane;

public class FXMLDocumentController implements Initializable {

@FXML
private Pane redPane;

@FXML
private void changeGridSize(ActionEvent event){
    new ChangeSize();
}


@Override
public void initialize(URL url, ResourceBundle rb) {

}    

public Pane getPane(){
    return this.redPane;
}
}

JavaFXApplication16

package javafxapplication16;

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 JavaFXApplication16 extends Application {

@Override
public void start(Stage stage) throws Exception {
  //  Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
   // FXMLLoader loader

    Parent loaded=null;
    FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));
    try {
        loaded = (Parent) loader.load();
    } catch (IOException e) {
        e.printStackTrace();
    }
    Scene scene = new Scene(loaded);

    stage.setScene(scene);
    stage.show();       
}

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    launch(args);
}
}

FXML

<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<GridPane fx:id="MenuRoot" gridLinesVisible="true" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="javafxapplication16.FXMLDocumentController">
  <columnConstraints>
  <ColumnConstraints hgrow="ALWAYS" maxWidth="1.7976931348623157E308" minWidth="0.0" percentWidth="50.0" />
  <ColumnConstraints hgrow="ALWAYS" maxWidth="1.7976931348623157E308" minWidth="0.0" percentWidth="50.0" />
  </columnConstraints>
   <rowConstraints>
    <RowConstraints maxHeight="1.7976931348623157E308" minHeight="0.0" percentHeight="50.0" vgrow="ALWAYS" />
    <RowConstraints maxHeight="1.7976931348623157E308" minHeight="0.0" percentHeight="50.0" vgrow="ALWAYS" />
    </rowConstraints>
    <children>
      <Pane fx:id="redPane" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="0.0" minWidth="0.0" prefHeight="200.0" prefWidth="200.0" style="-fx-background-color: red;" GridPane.rowIndex="1" />
      <Pane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="0.0" minWidth="0.0" prefHeight="200.0" prefWidth="200.0" style="-fx-background-color: black;" GridPane.columnIndex="1" GridPane.rowIndex="1" />
      <Button mnemonicParsing="false" onAction="#changeGridSize" text="Button" />
   </children>
</GridPane>