新增 - 属性值变更监听特性

[iohao]

新增功能的使用场景

属性可添加监听器，当某些属性值的发生变化时，触发监听器。

BooleanProperty

当 BooleanProperty 对象的值发生改变时，触发监听器。

var property = new BooleanProperty();
// add listener monitor property object
property.addListener((observable, oldValue, newValue) -> {
log.info("oldValue:{}, newValue:{}", oldValue, newValue);
});

property.get(); // value is false property.set(true); // 值变更时，将会触发监听器 property.get(); // value is true

**IntegerProperty**

> 当 IntegerProperty 对象的值发生改变时，触发监听器。

```java
var property = new IntegerProperty();
// add listener monitor property object
property.addListener((observable, oldValue, newValue) -> {
   log.info("oldValue:{}, newValue:{}", oldValue, newValue);
});

property.get(); // value is 0
property.set(22); // When the value changes,listeners are triggered
property.get(); // value is 22

property.increment(); // value is 23. will trigger listeners

ObjectProperty

当 ObjectProperty 对象内值的引用发生改变时，触发监听器。

YourUser user = new YourUser();

var property = new ObjectProperty(user);
// add listener monitor property object
property.addListener((observable, oldValue, newValue) -> {
   log.info("oldValue:{}, newValue:{}", oldValue, newValue);
});

property.set(user); // does not trigger listeners

YourUser user2 = new YourUser();
property.set(user2); // When the value changes,listeners are triggered
property.get(); // value is user2

class YourUser {}

将会提供

• IntegerProperty
• LongProperty
• StringProperty
• BooleanProperty
• ObjectProperty

[iohao]

https://github.com/iohao/ioGame/releases/tag/21.6