JavaFX Boolean Binding Based on Selected Items in a TableView
<p>I am attempting to enable a JavaFX <code>Button</code> depending on the aggregate of a property value in the selected rows in a <code>TableView</code>.  The following is an example application that demonstrates the problem:</p>

<pre><code>package test;

import java.util.Random;

import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.MultipleSelectionModel;
import javafx.scene.control.SelectionMode;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {

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

    private static class Row {
        private final BooleanProperty myProp;
        public Row(final boolean value) {
            myProp = new SimpleBooleanProperty(value);
        }
        public BooleanProperty propProperty() { return myProp; }
    }

    @Override
    public void start(final Stage window) throws Exception {
        // Create a VBox to hold the table and button
        final VBox root = new VBox();
        root.setMinSize(200, 200);

        // Create the table, and enable multi-select
        final TableView&lt;Row&gt; table = new TableView&lt;&gt;();
        final MultipleSelectionModel&lt;Row&gt; selectionModel = table.getSelectionModel();
        selectionModel.setSelectionMode(SelectionMode.MULTIPLE);
        root.getChildren().add(table);

        // Create a column based on the value of Row.propProperty()
        final TableColumn&lt;Row, Boolean&gt; column = new TableColumn&lt;&gt;("Value");
        column.setCellValueFactory(p -&gt; p.getValue().propProperty());
        table.getColumns().add(column);

        // Add a button below the table
        final Button button = new Button("Button");
        root.getChildren().add(button);

        // Populate the table with true/false values
        final ObservableList&lt;Row&gt; rows = table.getItems();
        rows.addAll(new Row(false), new Row(false), new Row(false));

        // Start a thread to randomly modify the row values
        final Random rng = new Random();
        final Thread thread = new Thread(() -&gt; {
            // Flip the value in a randomly selected row every 10 seconds
            try {
                do {
                    final int i = rng.nextInt(rows.size());
                    System.out.println("Flipping row " + i);
                    Thread.sleep(10000);
                    final BooleanProperty prop = rows.get(i).propProperty();
                    prop.set(!prop.get());
                } while (true);
            } catch (final InterruptedException e) {
                System.out.println("Exiting Thread");
            }
        }, "Row Flipper Thread");
        thread.setDaemon(true);
        thread.start();

        // Bind the button's disable property such that the button
        //     is only enabled if one of the selected rows is true
        final ObservableList&lt;Row&gt; selectedRows = selectionModel.getSelectedItems();
        button.disableProperty().bind(Bindings.createBooleanBinding(() -&gt; {
            for (int i = 0; i &lt; selectedRows.size(); ++i) {
                if (selectedRows.get(i).propProperty().get()) {
                    return false;
                }
            }
            return true;
        }, selectedRows));

        // Show the JavaFX window
        final Scene scene = new Scene(root);
        window.setScene(scene);
        window.show();
    }
}
</code></pre>

<p>To test, start the above application, and select the row indicated by the text "Flipping row N", where N is in [0, 2].  When the value of the selected row changes to true...</p>

<p><strong>Observed Behavior</strong> <code>button</code> remains disabled.<br/>
<strong>Desired Behavior</strong> <code>button</code> becomes enabled.</p>

<p>Does anyone know how to create a <code>BooleanBinding</code> that exhibits the desired behavior?</p>