java - libGDX:如何检测滚动 Pane 是否在最大 Y 处滚动？

Question

当播放器滚动到最后时，我需要在列表中添加新项目。那么，如何检测 Scrollpane 达到末尾或最大 Y ？

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

正如 other question 中提到的，您可以使用 ChangeListener 查找 getScrollY 的更改来执行 ScrollY 和 MaxY 的比较。

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());
    }
});