Javafx RichTextFx：如何向StyleClassedTextArea添加绑定

如果我的问题很明显，请原谅，但我不知道如何使用RichTextFx在

StyleClassedTextArea

中创建绑定。我想做的是有一个区域和一个按钮（它将触发某种文本处理），如果该区域是空的，则禁用该按钮。 我的代码如下

Main.java

package application;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("Main.fxml"));             
            Scene scene = new Scene(root);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        launch(args);
    }
}

package application;

import java.net.URL;
import java.util.ResourceBundle;
import org.fxmisc.richtext.StyleClassedTextArea;
import javafx.beans.binding.Bindings;
import javafx.beans.value.ObservableStringValue;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;

public class Controller implements Initializable {
    @FXML private StyleClassedTextArea mainArea;
    @FXML private Button processButton;
    @Override
    public void initialize(URL arg0, ResourceBundle arg1) {
        // TODO Auto-generated method stub
        processButton.disableProperty().bind(Bindings.isEmpty((ObservableStringValue) mainArea.textProperty()));
    }   
}

Controller.java

package application;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("Main.fxml"));             
            Scene scene = new Scene(root);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        launch(args);
    }
}

package application;

import java.net.URL;
import java.util.ResourceBundle;
import org.fxmisc.richtext.StyleClassedTextArea;
import javafx.beans.binding.Bindings;
import javafx.beans.value.ObservableStringValue;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;

public class Controller implements Initializable {
    @FXML private StyleClassedTextArea mainArea;
    @FXML private Button processButton;
    @Override
    public void initialize(URL arg0, ResourceBundle arg1) {
        // TODO Auto-generated method stub
        processButton.disableProperty().bind(Bindings.isEmpty((ObservableStringValue) mainArea.textProperty()));
    }   
}

Main.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.VBox?>
<?import org.fxmisc.richtext.StyleClassedTextArea?>


<AnchorPane prefHeight="308.0" prefWidth="291.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.60" fx:controller="application.Controller">
   <children>
      <VBox layoutY="6.0" prefHeight="308.0" prefWidth="291.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
         <children>
            <StyleClassedTextArea fx:id="mainArea" />
            <Button fx:id="processButton" mnemonicParsing="false" text="process" />
         </children>
      </VBox>
   </children>
</AnchorPane>

---

这很疯狂，但很有效：

@Override
public void initialize(URL arg0, ResourceBundle arg1) {
    // TODO Auto-generated method stub
    ObservableValue<String> qwer = mainArea.textProperty();

    ObservableStringValue qwerQ = new ObservableStringValue() {
        public String get() { return qwer.getValue(); }
        public String getValue() { return qwer.getValue(); }
        public void addListener( InvalidationListener listener ) {
            qwer.addListener( listener );
        }
        public void removeListener( InvalidationListener listener ) {
            qwer.removeListener( listener );
        }
        public void addListener( ChangeListener<? super String>  listener ) {
            qwer.addListener( listener );
        }
        public void removeListener( ChangeListener<? super String> listener ) {
            qwer.removeListener( listener );
        }
    };

    processButton.disableProperty().bind(Bindings.isEmpty( qwerQ ) );
}

---

尝试显式强制转换：

processButton.disableProperty（）.bind（Bindings.isEmpty（（ObservableStringValue）mainTextArea.textProperty（））

@AndreyM不幸无法工作，引发了一个奇怪的异常。我编辑了我的问题，其中包括一个MCVEWell错误，换句话说，它不能被铸造：）