console-output.txt

OS: Windows 8.1
JVM: 1.8.0_40 (25.40-b25 - amd64)

Before firePulse():
  Item count: 5
  First visible cell: null
  Last visible cell: null
After firePulse():
  Item count: 5
  First visible cell: ListViewSkin$2@7820053f[styleClass=cell indexed-cell list-cell]'list-item-1'
  Last visible cell: ListViewSkin$2@8be9262[styleClass=cell indexed-cell list-cell]'list-item-5'

FirePulseApplication.java

import com.sun.javafx.scene.control.skin.VirtualFlow;
import com.sun.javafx.tk.Toolkit;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.collections.ObservableList;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.IndexedCell;
import javafx.scene.control.ListView;
import javafx.stage.Stage;

public class FirePulseApplication extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        printEnv();

        ListView<String> listView = new ListView<>();

        Scene scene = new Scene(listView, 200, 400);
        primaryStage.setScene(scene);
        primaryStage.show();

        for (int i = 1; i < 6; i++) {
            listView.getItems().add("list-item-" + i);
        }

        System.out.println("Before firePulse():");
        printVisibleRowInfo(listView);

        Toolkit.getToolkit().firePulse();

        System.out.println("After firePulse():");
        printVisibleRowInfo(listView);

        Platform.exit();
    }

    private void printVisibleRowInfo(ListView<?> listView) {
        // Item count according to the list model
        System.out.println("  Item count: " + listView.getItems().size());

        // Extract the VirtualFlow so it can be used to determine which
        // list items are rendered in the scene.
        ObservableList<Node> children = listView.getChildrenUnmodifiable();
        VirtualFlow<?> flow = (VirtualFlow<?>) children.get(0);

        IndexedCell<?> firstCell = flow.getFirstVisibleCell();
        System.out.println("  First visible cell: " + firstCell);

        IndexedCell<?> lastCell = flow.getLastVisibleCell();
        System.out.println("  Last visible cell: " + lastCell);
    }

    private void printEnv() {
        String osName = System.getProperty("os.name");
        String jvm = System.getProperty("java.version") +
                " (" + System.getProperty("java.vm.version") +
                " - " + System.getProperty("os.arch") + ")";

        System.out.println("OS: " + osName);
        System.out.println("JVM: " + jvm);
        System.out.println("");
    }
}