TextField affecting the caret at the end when losing point on

Hey everybody,

I would like to put the caret of a TextField at the end of the text when the textfield loses focus, so that the last part of the name of the file will be shwon and not the first part. I ve tried the following:

ChangeListener<Boolean> onLooseFocus = new ChangeListener<Boolean>() 
         { 
              @Override
              public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) 
              {
                   if (!newValue.booleanValue()) 
                   {
                        textFieldDateiname.end();     
                                System.out.println(textFieldDateiname.getCaretPosition()); 
                                // At this point the caret is at the end and it will show:
                                //ReadOnlyIntegerProperty [bean: TextField[id=textFieldDateiname, styleClass=text-input text-field], name: caretPosition, value: 76]
                   }
              }
         };

This ChangeListener is added to the focusedProperty() of my TextField method

textFieldDateiname.focusedProperty().addListener(onLooseFocus);

It not work doesn´t, the circumflex is temporarily at the end of the text field.

Another question: if it works, I would like to reuse the ChangeListener onLooseFocus for diefferent TextField. So I would like to know which TextField has lost focus. I tried

observable.getSoruce(); // like it works with keyEvent
System.out.println(observable); // -> ReadOnlyBooleanProperty [bean: TextField[id=textFieldDateiname, styleClass=text-input text-field], name: focused, value: false]

If the id of the source of the ChangeEvent is known...

Any ideas?

Thank you

Lukas

Edited by: 972241 on 20.11.2012 06:08

For the latter, you can climb the Observable to a ReadOnlyProperty and call getBean() on it; mount the getBean() call results in a TextField.

I have no good solution for most of your question. It seems that the default behavior is to restore the position of carat at the beginning of the text, and the listener realizes that runs after your custom listener.
If the best hack I see is to have a flag that replaces the carat position changes. Set the flag to true on loses focus. Register a listener with the position property of carat, and if the flag is set back to carat at the end (and then disabled the indicator).
If you want to use the headphones on several fields of text, instead of a flag, have a set of textfields which will have their positions carat substituted changes.

It's really a hack; I'd like to think that there is a better solution.

import java.util.HashSet;
import java.util.Set;

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.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class TestFieldFocusTest extends Application {

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

    final Set overrideNextCaratChange = new HashSet();

    final ChangeListener onLoseFocus = new ChangeListener() {
      @Override
      public void changed(ObservableValue observable,
          Boolean oldValue, Boolean newValue) {
        ReadOnlyProperty property = (ReadOnlyProperty) observable ;
        TextField tf = (TextField) property.getBean() ;
        if (!newValue.booleanValue()) {
          tf.end();
          overrideNextCaratChange.add(tf);
        }
      }
    };

    final ChangeListener onCaratChange = new ChangeListener() {
      @Override
      public void changed(ObservableValue observable, Number oldValue, Number newValue) {
        ReadOnlyProperty property = (ReadOnlyProperty) observable ;
        TextField tf = (TextField) property.getBean() ;
        if (overrideNextCaratChange.contains(tf)) {
          tf.end();
          overrideNextCaratChange.remove(tf);
        }
      }
    };

    tf1.focusedProperty().addListener(onLoseFocus);
    tf1.caretPositionProperty().addListener(onCaratChange);
    tf2.focusedProperty().addListener(onLoseFocus);
    tf2.caretPositionProperty().addListener(onCaratChange);

    Button info = new Button("Show info");
    info.setOnAction(new EventHandler() {

      @Override
      public void handle(ActionEvent arg0) {
        System.out.printf("Selection: %s (%d characters). Carat position: %d%n",
            tf1.getSelection(),
            tf1.getSelectedText().length(),
            tf1.getCaretPosition());
      }
    });

    root.getChildren().addAll(tf1, tf2, info);
    Scene scene = new Scene(root, 100, 200);
    primaryStage.setScene(scene);
    primaryStage.show();
  }

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

}

Tags: Java

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