Link the dimensions of ObservableList?

In an application I'm working on I have a Die ObservableList named dice each with a faceValueProperty. Then I have a lot of SimpleIntegerProperties like one of them for example. I want that the two values to be bound to the amount of Die in the list of who has edited 2. I initially thought to bind to the size of a filtered list, but the size() is not an observable property. Any help on how to link these values is appreciated, no matter how much code review, it implies to me. Thank you

Use Bindings.size (...) and pass your filtered list.

import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.collections.transformation.FilteredList;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class FilteredListSizeTest extends Application {

 @Override
  public void start(Stage primaryStage) {
  ListView listView = new ListView<>();
  ComboBox combo = new ComboBox<>();
  for (int i=1; i<=6; i++) {
      combo.getItems().add(i);
  }
  combo.getSelectionModel().select(new Integer(1));
  Button addButton = new Button("Add");
  addButton.setOnAction(event -> listView.getItems().add(new Die(combo.getValue())));
  HBox controls = new HBox(5, combo, addButton);
  controls.setPadding(new Insets(5));
  controls.setAlignment(Pos.CENTER);

  FilteredList twos = new FilteredList<>(listView.getItems(), die -> die.getValue()==2);
  Label label = new Label();
  label.textProperty().bind(Bindings.format("Twos: %d", Bindings.size(twos)));

  BorderPane root = new BorderPane(listView, controls, null, label, null);
  Scene scene = new Scene(root, 400, 600);
  primaryStage.setScene(scene);
  primaryStage.show();
  }

 public static class Die {
      private final int value ;
      public Die(int value) {
          if (value < 1 || value > 6) {
              throw new IllegalArgumentException("Invalid die value: "+value);
          }
          this.value = value ;
      }
      public int getValue() {
          return value ;
      }

      @Override
      public String toString() {
          return Integer.toString(value);
      }
  }

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

Tags: Java

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