libGDX：如何檢測Scrollpane以最大Y滾動？

Question

當播放器最后滾動時，我需要在列表中添加新項目。 因此，如何檢測到達最底端或最大Y的Scrollpane ？

private Table list;
private ScrollPane scrollPane;

private void buildPlayersList() {
    list = new Table();
    scrollPane = new ScrollPane(list);
}

private boolean isTheEnd() {
    // condition !!!
    return scrollPane.getScrollY() >= scrollPane.getMaxY();
}

@Override
public void onTheEndRequest() {
    int offset = list.getRows();
    int limit = 10;

    Actor player = this.getPlayer(offset, limit);

    list.add(player).row();
}

private Actor getPlayer(int offset, int limit) {
    // retrieve player from database
    // ......
    Player player = database.getPlayer();

    Label label = new Label(player.getName(), style);
    return label;
}

Answer 1

就像在另一個問題中提到的那樣，您可以使用ChangeListener查找對getScrollY的更改以執行ScrollY和MaxY的比較。

s1.vvalueProperty().addListener(new ChangeListener<Number>() {
    public void changed(ObservableValue<? extends Number> ov,
                        Number old_val, Number new_val) {
        // if ScrollY == maxY; then displayMoreItems
        System.out.println(new_val.intValue());
    }
});