package javafx_propertylistener; import javafx.application.Application; import javafx.beans.property.SimpleStringProperty; import javafx.beans.property.StringProperty; 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.Label; import javafx.scene.control.TextField; import javafx.scene.layout.StackPane; import javafx.scene.layout.VBox; import javafx.stage.Stage; /** * * @web http://java-buddy.blogspot.com/ */ public class JavaFX_PropertyListener extends Application { @Override public void start(Stage primaryStage) { StringProperty stringProperty = new SimpleStringProperty(); TextField textInput = new TextField(); Label labelOutput1 = new Label(); Label labelObservable = new Label(); Label labelOldvalue = new Label(); Label labelNewvalue = new Label(); labelOutput1.textProperty().bind(textInput.textProperty()); Button btn = new Button(); btn.setText("Updated"); btn.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { stringProperty.set(textInput.getText()); } }); // add listener for stringProperty // to be called when stringProperty changed stringProperty.addListener(new ChangeListener(){ @Override public void changed(ObservableValue observable, Object oldValue, Object newValue) { labelObservable.setText((String)observable.getValue()); labelOldvalue.setText((String)oldValue); labelNewvalue.setText((String)newValue); } }); VBox vBox = new VBox(); vBox.getChildren().addAll(textInput, labelOutput1, btn, labelObservable, labelOldvalue, labelNewvalue); StackPane root = new StackPane(); root.getChildren().add(vBox); Scene scene = new Scene(root, 300, 250); primaryStage.setTitle("Java-Buddy"); primaryStage.setScene(scene); primaryStage.show(); } public static void main(String[] args) { launch(args); } }
Wednesday, August 13, 2014
Add listener to StringProperty to monitor property change
Example to implement ChangeListener() to monitor StringProperty change.
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