How to format SimpleIntegerProperty output - formatting

Question

I do have a SimpleIntegerProperty which contains a number which is the time in 100ms steps like 40 is 4,0 seconds
I do want to display this value to the user with a Label which should display "4,0 s"
I would like to bind the value with the bindings api like
label.textProperty().bind(myobject.secondsProperty().asString());
but how do i create a simple and reusable Converter, i do need only the unidirectional binding.

Answer 1

There is an overloaded form of the asString(...) method that takes a format string as an argument:
String secondsFormat = "%.1f s" ;
label.textProperty().bind(myobject.secondsProperty().asString(secondsFormat));
If you really need a StringConverter, you can do
StringConverter<Integer> deciSecondsConverter = new StringConverter<Integer>() {
#Override
public String toString(Integer deciSeconds) {
return String.format("%.1f s", deciSeconds.doubleValue()/10);
}
#Override
public Integer fromString(String string) {
// not implemented
return null ;
}
};
and then
label.textProperty().bind(Bindings.createStringBinding(
() -> deciSecondsConverter.toString(myobject.getSeconds()),
myobject.secondsProperty()
));
SSCCE:
import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.stage.Stage;
import javafx.util.StringConverter;
public class StopwatchTest extends Application {
#Override
public void start(Stage primaryStage) {
IntegerProperty tenthsOfSeconds = new SimpleIntegerProperty();
Label label = new Label();
StringConverter<Integer> deciSecondsConverter = new StringConverter<Integer>() {
#Override
public String toString(Integer deciSeconds) {
return String.format("%.1f s", deciSeconds.doubleValue()/10);
}
#Override
public Integer fromString(String string) {
// not implemented
return null ;
}
};
label.textProperty().bind(Bindings.createStringBinding(() ->
deciSecondsConverter.toString(tenthsOfSeconds.get()),
tenthsOfSeconds));
new AnimationTimer() {
#Override
public void handle(long now) {
tenthsOfSeconds.set((int)System.currentTimeMillis() % 60000 / 100);
}
}.start();
label.setPadding(new Insets(5, 20, 5, 20));
primaryStage.setScene(new Scene(label, 80, 30));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}