实施房产变更通知的最佳方式是什么？ [英] What is the best way to implement notification about property change?

问题描述

有一个bean（类似POJO）并且想要为它的GUI组件制作模型。所以我需要通知GUI组件可以反映的每个属性更改。

A have a bean (POJO-like) and want to make model for GUI component of it. So I need to notify about each property change in order GUI component can reflect.

如何做到这一点？我应该在我的bean中放置通知和监听器存储代码吗？但这会使它变脏。可能会写一些包装？但是这会重复getter和setter。

How to do this? Should I put notification and listener storage code just inside my bean? But this will make it "dirty". May be write some wrapper? But this will duplicate getters and setters.

在Commons或其他地方是否有任何库和/或辅助对象？

Are there any libraries and/or helper objects for this in Commons or somewhere else?

更新

还假设我有 AbstractList< E> 实施。如何快速定性它，即让它通知听众变化？例如，通过触发 ListDataEvent 。我知道我可以实现 AbstractListModel< E> 而不是 AbstractList< E> 但它看起来更糟。我希望保持大多数类似pojo......

Also suppose I have AbstractList<E> implementation. How to "propertize" it quickly, i.e. make it to notify listeners about changes? For example, by firing ListDataEvent. I know I can implement AbstractListModel<E> instead of AbstractList<E> but it looks worse. I wish to stay mostly "pojo-like"...

推荐答案

看看 FXCollections （JDK 7）：

List<String> list = new ArrayList<String>();

list.add("s1");
list.add("s2");

ObservableList<String> observableList = FXCollections.observableList(list);

observableList.addListener(new ListChangeListener<String>() {
    @Override
    public void onChanged(Change<? extends String> change) {
        while (change.next()) {
            if(change.wasAdded()){
                System.out.printf("added: %s, from: %d, to: %d%n", change.getAddedSubList(), change.getFrom(), change.getTo());
            }else
            if(change.wasReplaced()){
                System.out.printf("replaced: %s, from: %d, to: %d%n", change.getAddedSubList(), change.getFrom(), change.getTo());
            }
        }
    }
});

observableList.add("s3");
observableList.set(1, "s1-new-value");

这将产生一个输出：

added: [s3], from: 2, to: 3
added: [s1-new-value], from: 1, to: 2

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