问题描述

我有2组事件，可以改变表行的外观.

1. 某些条件闪烁时表闪烁
2. 表突出显示何时添加新项目

假设我的TableView称为table，我的代码结构是这样的:

TableView<Trade> table = ... ;
table.setRowFactory(            private final BooleanBinding itemIsNewTrade = Bindings.isNotNull(itemProperty()).and(Bindings.equal(itemProperty(), recentlyAddedTrade));

        {
            // anonymous constructor:
            itemIsNewTrade.addListener((obs, wasNew, isNew) -> pseudoClassStateChanged(newTradePseudoClass, isNew));
        }   

            tv -> {
            TableRow<Trade> row = new TableRow<>();
            Timeline flasher = new Timeline(

                    new KeyFrame(Duration.seconds(0.5), e -> {
                        row.pseudoClassStateChanged(flashHighlight, true);
                    }),

                    new KeyFrame(Duration.seconds(1.0), e -> {
                        row.pseudoClassStateChanged(flashHighlight, false);
                    })
            );
            flasher.setCycleCount(Animation.INDEFINITE);

            ChangeListener<Boolean> cautionListener = (obs, cautionWasSet, cautionIsNowSet) -> {
                if (cautionIsNowSet) {
                    flasher.play();
                } else {
                    flasher.stop();
                    row.pseudoClassStateChanged(flashHighlight, false);
                }
            };

            row.itemProperty().addListener((obs, oldItem, newItem) -> {
                if (oldItem != null) {
                    oldItem.cautionProperty().removeListener(cautionListener);
                }
                if (newItem == null) {
                    flasher.stop();
                    row.pseudoClassStateChanged(flashHighlight, false);
                } else {
                    newItem.cautionProperty().addListener(cautionListener);
                    if (newItem.cautionProperty().get()) {
                        flasher.play();
                    } else {
                        flasher.stop();
                        row.pseudoClassStateChanged(flashHighlight, false);
                    }
                }
            });
            return row ;
        }
    );

更新:
表闪烁的代码来自在这里来自在这里.我试图通过具有上述结构来将两者结合在一起.

但是我遇到了错误.我只是不知道如何将匿名的内部类和lambda表达组合在一起

我应该如何克服这个?

推荐答案

做到这一点的最佳方法是创建一个单独的TableRow类，而不是匿名的内部类.

我在下面创建了一个示例实现.

有些值得一提的事情:

1. 您需要在CSS文件中为新添加的TableRow.

中定义样式.table-row-cell:new

2. 您需要在TableRow(s)中定义样式.table-row-cell:flash当前正在闪烁的CSS文件.
3. 构造函数需要知道(ObjectExpression)，该项目存储了最近添加的项目，这可能是recentlyAddedTrade.
4. 构造函数需要知道(Function<T, BooleanExpression>)如何提取确定闪烁状态的属性.在您的情况下，应该是Trade::cautionProperty.

这是实现示例:

public static class AnimatedTableRow<T> extends TableRow<T> {

    private static final PseudoClass PS_NEW = PseudoClass.getPseudoClass("new");
    private static final PseudoClass PS_FLASH = PseudoClass.getPseudoClass("flash");

    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 AnimatedTableRow(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();
        } else {
            flashTimeline.stop();
            pseudoClassStateChanged(PS_FLASH, false);
        }
    }

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

    @Override
    protected void updateItem(T item, boolean empty) {
        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();
    }
}

用法:

table.setRowFactory(tableView -> new AnimatedTableRow<>(recentlyAddedPerson, Person::flashProperty));

以上所述是小编给大家介绍的javafx:setRowFactory中的多个事件，并结合匿名内部类和lambda表达式,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对77isp云服务器技术网的支持！