0

How to notify change from Local class (Listener) [closed]

asked 2018-01-02 14:27:30 +0800

adilov gravatar image adilov
3 1

updated 2018-01-02 14:33:17 +0800

@Command
public void someMethod() {
  final Object bean = this;
  EventListener<ClickEvent> clickListener = new EventListener<Messagebox.ClickEvent>() {
    public void onEvent(ClickEvent event) throws Exception {
      if(Messagebox.Button.YES.equals(event.getButton())) {
        // ...
        BindUtils.postNotifyChange(null, null, bean, "yourIDhere");
      }
    }
};

Messagebox.show("Question?", "Title", new Messagebox.Button[]{Messagebox.Button.YES, Messagebox.Button.NO }, Messagebox.QUESTION, clickListener);
}

Just wanted to share a "trick" that I had to use... If you have local class, e.g. listener as in the code above, and you want to notify for a change, the @NotifyChange annotation will not help you. Or it just didn't work in my case - it doesn't matter if it's above the "delete()" method or above the "onEvent". In this case the "BindUtils.postNotifyChange" can be used, BUT the bean reference must be passed as a parameter, initialized outside the anonymous class.

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The question has been closed for the following reason "the question is answered, right answer was accepted" by cor3000
close date 2018-01-04 14:27:55

1 Answer

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answered 2018-01-03 15:26:20 +0800

cor3000 gravatar image cor3000
4263 1 7
ZK Team

Hi Adilov,

thanks for sharing your 'trick'. In fact it's not a trick but rather the programmatic way to notify change a property. You are right, @NotifyChange can't help you if you call a method yourself, and that's why you correctly found the BindUtils.postNotifyChange() method. When using a local inner class you can reference the outer this like in the example below. No need for an additional variable.

public class SomeViewModel {
  @Command
  public void someMethod() {
    EventListener<ClickEvent> clickListener = new EventListener<Messagebox.ClickEvent>() {
      public void onEvent(ClickEvent event) throws Exception {
        if(Messagebox.Button.YES.equals(event.getButton())) {
          // ...
          BindUtils.postNotifyChange(null, null, SomeViewModel.this, "yourIDhere");
        }
      }
  };

  Messagebox.show("Question?", "Title", new Messagebox.Button[]{Messagebox.Button.YES, Messagebox.Button.NO }, 
    Messagebox.QUESTION, clickListener);
  }

}

When using Java 8 this isn't even necessary anymore:

@Command
public void someMethod() {
    Messagebox.show("Question?", "Title",
            new Messagebox.Button[]{Messagebox.Button.YES, Messagebox.Button.NO},
            Messagebox.QUESTION,
            event -> {
                if (Messagebox.Button.YES.equals(event.getButton())) {
                    // ...
                    BindUtils.postNotifyChange(null, null, this, "yourIDhere");
                }
            });
}
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Asked: 2018-01-02 14:27:30 +0800

Seen: 12 times

Last updated: Jan 03

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