javafx:setRowFactory无法检测TableView的当前状态

Question

我有以下 setRowFactory 类。我不将其编写为匿名类的原因是因为我在该类中有多个函数，并且我希望该类可重用。其功能是:

1. 在 TableView 中突出显示最近添加的交易对象(整行)
2. 当价格属性大于 0 时，“价格”单元格会闪烁，此时警告属性变为 true。

公开课贸易{

    private ReadOnlyBooleanWrapper caution;
     ...

    // with constructor there is 
    public Trade(){
          ...
          this.caution = new ReadOnlyBooleanWrapper();
          this.caution.bind(this.price.greaterThan(0));
    }
    ...

}

这很好用。当我从 TableView 中删除 Trade 对象时，出现问题。空行继续闪烁，这显然意味着代码没有监视 TableView 的当前状态。

我对 javafx 还很陌生，我认为我缺少 addListener 代码来跟踪 tableView 中所有行的当前状态(如果我错了，请纠正我。)我不知道如何写出来。

代码:

public class AnimatedTransactionLogTableRow<T> extends TableRow<T> {

    private static final PseudoClass PS_NEW = PseudoClass.getPseudoClass("new-row");
    private static final PseudoClass PS_FLASH = PseudoClass.getPseudoClass("flash-row");
    private static final PseudoClass PS_CF = PseudoClass.getPseudoClass("cell-positive");


    private final ObjectExpression<T> recentItem;
    private final InvalidationListener recentlyAddedListener = fObs -> recentItemChanged();

    private final Function<T, BooleanExpression> flashExtractor;
    private final ChangeListener<Boolean> flashListener = (fObs, fOld, fNew) -> flasherChanged(fNew);
    private final Timeline flashTimeline;

    public AnimatedTransactionLogTableRow(ObjectExpression<T> fRecentlyAddedProperty
                                         ,Function<T, BooleanExpression> fFlashExtractor
                                        ) {
        recentItem = fRecentlyAddedProperty;
        recentItem.addListener(new WeakInvalidationListener(recentlyAddedListener));


        flashExtractor = fFlashExtractor;
        flashTimeline = new Timeline(
                new KeyFrame(Duration.seconds(0.5), e -> pseudoClassStateChanged(PS_FLASH, true)),
                new KeyFrame(Duration.seconds(1.0), e -> pseudoClassStateChanged(PS_FLASH, false)));
        flashTimeline.setCycleCount(Animation.INDEFINITE);

    }


    private void flasherChanged(boolean fNew) {
        if (fNew) {
            flashTimeline.play();
            pseudoClassStateChanged(PS_CF,true);
        } else {
            flashTimeline.stop();
            pseudoClassStateChanged(PS_FLASH, false);
            pseudoClassStateChanged(PS_CF,false);

        }
    }

    private void recentItemChanged() {
        final T tmpRecentItem = recentItem.get();
        pseudoClassStateChanged(PS_NEW, tmpRecentItem != null && tmpRecentItem == getItem());
    }


    @Override
    protected void updateItem(T item, boolean empty) {
        System.out.println("getItem(): " + getItem());
        if (getItem() != null) {
            final BooleanExpression be = flashExtractor.apply(getItem());
            if (be != null) {
                be.removeListener(flashListener);
            }
        }

        super.updateItem(item, empty);

        if (getItem() != null) {
            final BooleanExpression be = flashExtractor.apply(getItem());
            if (be != null) {
                be.addListener(flashListener);
                flasherChanged(be.get());
            }
        }

        recentItemChanged();
    }

}

Answer 1

我想如果 TableRow 为空，您需要调用 flasherChanged(false);。

例如:

@Override
protected void updateItem(T item, boolean empty) {
    System.out.println("getItem(): " + getItem());
    if (getItem() != null) {
        final BooleanExpression be = flashExtractor.apply(getItem());
        if (be != null) {
            be.removeListener(flashListener);
        }
    }

    super.updateItem(item, empty);

    if(empty) {
        flasherChanged(false);  
    }
    else if (getItem() != null) {
        final BooleanExpression be = flashExtractor.apply(getItem());
        if (be != null) {
            be.addListener(flashListener);
            flasherChanged(be.get());
        }
    }

    recentItemChanged();
}