Java ObservableValue.addListener方法代碼示例

import javafx.beans.value.ObservableValue; //導入方法依賴的package包/類
public static <F, T> ObservableValue<T> nestValue(ObservableValue<F> pf, Function<F, ObservableValue<T>> func) {
  ObservableValue<T> current = func.apply(pf.getValue());
  Property<T> nestProp = new SimpleObjectProperty<>();
  nestProp.bind(current);
  pf.addListener((ob, o, n) -> {
    ObservableValue<T> pt = func.apply(n);
    nestProp.unbind();
    nestProp.bind(pt);
  });
  return nestProp;
}
 

import javafx.beans.value.ObservableValue; //導入方法依賴的package包/類
public static <F, T> ListProperty<T> nestListProp(ObservableValue<F> pf, Function<F, ListProperty<T>> func) {
  ListProperty<T> current = func.apply(pf.getValue());
  ListProperty<T> nestProp = new SimpleListProperty<>();
  CacheUtil.set(BeanUtil.class, nestProp, current);
  nestProp.bindBidirectional(current);
  pf.addListener((ob, o, n) -> {
    CacheUtil.<ListProperty<T>> remove(BeanUtil.class, nestProp).ifPresent(p -> nestProp.unbindContentBidirectional(p));
    ListProperty<T> pt = func.apply(n);
    CacheUtil.set(BeanUtil.class, nestProp, pt);
    nestProp.bindContentBidirectional(pt);
  });
  return nestProp;
}
 

import javafx.beans.value.ObservableValue; //導入方法依賴的package包/類
public static <F, T> ObservableList<T> nestListValue(ObservableValue<F> pf, Function<F, ObservableList<T>> func) {
  ObservableList<T> current = func.apply(pf.getValue());
  ListProperty<T> nestProp = new SimpleListProperty<>();
  CacheUtil.set(BeanUtil.class, nestProp, current);
  nestProp.bindContent(current);
  pf.addListener((ob, o, n) -> {
    CacheUtil.<ListProperty<T>> remove(BeanUtil.class, nestProp).ifPresent(p -> nestProp.unbindContent(p));
    ObservableList<T> pt = func.apply(n);
    CacheUtil.set(BeanUtil.class, nestProp, pt);
    nestProp.bindContent(pt);
  });
  return nestProp;
}
 

import javafx.beans.value.ObservableValue; //導入方法依賴的package包/類
/**
 * The variable will be automatically updated when the value changes
 * @see Formatter#setVariable(String, String)
 * @param var Variable
 * @param observable Observable property
 */
public void setObservableVariable(String var, ObservableValue<?> observable) {
    setVariable(var, observable.getValue().toString());
    observable.addListener(o -> {
        if(additionalVariables.containsKey(var)) {
            setVariable(var, observable.getValue().toString());
        }
    });
}
 

import javafx.beans.value.ObservableValue; //導入方法依賴的package包/類
private FunctionBasedValidator(ObservableValue<T> source) {
	source.addListener((observable, oldValue, newValue) -> {
		validate(newValue);
	});
}
 

import javafx.beans.value.ObservableValue; //導入方法依賴的package包/類
public void bindModified(ObservableValue<?>... ovs) {
  for (ObservableValue<?> ov : ovs) {
    ov.addListener((observable, o, n) -> modified());
  }
}
 

import javafx.beans.value.ObservableValue; //導入方法依賴的package包/類
/**
 * Binds the atomic property to an observable value.
 *
 * @see Property#bind(ObservableValue)
 */
public void bind(ObservableValue<? extends T> observableValue) {
  Objects.requireNonNull(observableValue, "Cannot bind to a null observable");
  bound = new WeakReference<>(observableValue);
  observableValue.addListener(bindingListener);
}
 

import javafx.beans.value.ObservableValue; //導入方法依賴的package包/類
public static void register(Subroutine function, ObservableValue<State> target)
{
	OnLoadListener listener = new OnLoadListener(function);
	listener.observable = target;
	target.addListener(listener);
}
 

import javafx.beans.value.ObservableValue; //導入方法依賴的package包/類
/**
 * Add a rule for this validator.
 * <p>
 * The rule defines a condition that has to be fulfilled.
 * <p>
 * A rule is defined by an observable boolean value. If the rule has a value of <code>true</code> the rule is
 * "fulfilled". If the rule has a value of <code>false</code> the rule is violated. In this case the given message
 * object will be added to the status of this validator.
 * <p>
 * There are some predefined rules for common use cases in the {@link ObservableRules} class that can be used.
 * 
 * @param rule
 * @param message
 */
public void addRule(ObservableValue<Boolean> rule, ValidationMessage message) {
	rules.add(rule);
	
	rule.addListener((observable, oldValue, newValue) -> {
		validateRule(newValue, message);
	});
	
	validateRule(rule.getValue(), message);
}
 

import javafx.beans.value.ObservableValue; //導入方法依賴的package包/類
/**
 * Binds an observable list to a list property.
 *
 * @param list       the observable list to bind
 * @param observable the property to bind to
 * @param <T>        the type of elements in the list
 */
public static <T> void bind(ObservableList<? super T> list,
                            ObservableValue<? extends List<? extends T>> observable) {
  list.setAll(observable.getValue());
  observable.addListener((__, oldList, newList) -> list.setAll(newList));
}