Share the same code between TextField actionEvent() and focusedProperty.addListener)

Hello.

Following the DRY principle, I want the same piece of validation of the code to execute in the actionEvent() and focusedProperty.addListener () of my TextField. I tried to create a private method and calling in the two managers, but in the actionEvent handler I am accessing the event object to read an animation on the textfield object, which is not passed into the method the listener for the focusedProperty changed(). What is the best way to fix this without repeating the code?

Yes, sorry; This is what comes from working on a phone without checking the API documentation... It's a ReadOnlyProperty, not a property.

It works:

import java.util.regex.Pattern;

import javafx.application.Application;
import javafx.beans.property.ReadOnlyProperty;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class ValidatingTextFieldExample extends Application {

 @Override
  public void start(Stage primaryStage) {
  final VBox root = new VBox(5);
  final ChangeListener focusListener = new ChangeListener() {
            @Override
            public void changed(ObservableValue observable,
                    Boolean oldValue, Boolean newValue) {
                if (! newValue) {
                    TextField textField = (TextField) ((ReadOnlyProperty) observable).getBean();
                     doValidation(textField);
               }
            }
  };
  final EventHandler actionHandler = new EventHandler() {
            @Override
            public void handle(ActionEvent event) {
                TextField textField = (TextField) event.getSource();
                doValidation(textField);
            }
        };
        TextField tf1 = new TextField();
        TextField tf2 = new TextField();
        tf1.setOnAction(actionHandler);
        tf1.focusedProperty().addListener(focusListener);
        tf2.setOnAction(actionHandler);
        tf2.focusedProperty().addListener(focusListener);

        root.getChildren().addAll(tf1, tf2);
        primaryStage.setScene(new Scene(root, 300, 150));
        primaryStage.show();
  }

  private void doValidation(TextField textField) {
      if (isTextValid(textField.getText())) {
          textField.setStyle("");
      } else {
          textField.setStyle("-fx-text-fill: red;");
      }
  }

  private boolean isTextValid(String text) {
      // just digits are valid (very simple example)
      return Pattern.matches("^[0-9]*$", text);
  }

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

But also consider this solution, which uses any events, has no Cast, but still fills your DRY principle:

import java.util.regex.Pattern;

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class ValidatingTextFieldExample extends Application {

 @Override
  public void start(Stage primaryStage) {
  final VBox root = new VBox(5);
        TextField tf1 = new TextField();
        TextField tf2 = new TextField();
        registerValidationHandlers(tf1);
        registerValidationHandlers(tf2);

        root.getChildren().addAll(tf1, tf2);
        primaryStage.setScene(new Scene(root, 300, 150));
        primaryStage.show();
  }

  private void registerValidationHandlers(final TextField textField) {
      textField.setOnAction(new EventHandler() {
          @Override
          public void handle(ActionEvent event) {
              doValidation(textField);
          }
      });
      textField.focusedProperty().addListener(new ChangeListener() {
          @Override
          public void changed(ObservableValue observable, Boolean wasFocused, Boolean isFocused) {
              if (! isFocused) {
                  doValidation(textField);
              }
          }
      });
  }

  private void doValidation(TextField textField) {
      if (isTextValid(textField.getText())) {
          textField.setStyle("");
      } else {
          textField.setStyle("-fx-text-fill: red;");
      }
  }

  private boolean isTextValid(String text) {
      // just digits are valid (very simple example)
      return Pattern.matches("^[0-9]*$", text);
  }

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

You could even make a varargs method, thereby avoiding even reproduce the call to this method to the registerValidationHandlers method.

Tags: Java

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