java - 来自自定义类的 fireEvent

Question

我有以下类 ProtokollEvent

public class ProtokollEvent extends Event {

//variable holds all devices in given protokoll
private ObservableList<Device> devicesList;

//variable holds SaveResult
private SaveResult result;

//final ProtokollEvents
public static final EventType<ProtokollEvent> PROTOKOLL_SAVE = new EventType(ANY, "PROTOKOLL_SAVE");
public static final EventType<ProtokollEvent> PROTOKOLL_SAVE_DONE = new EventType(ANY, "PROTOKOLL_SAVE_DONE");
public static final EventType<ProtokollEvent> PROTOKOLL_UPDATED = new EventType(ANY, "PROTOKOLL_UPDATED");
public static final EventType<ProtokollEvent> PROTOKOLL_DELETED = new EventType(ANY, "PROTOKOLL_DELETED");

public ProtokollEvent() {
    this(PROTOKOLL_SAVE);
}

public ProtokollEvent(EventType<? extends Event> arg0) {
    super(arg0);
}

public ProtokollEvent(Object arg0, EventTarget arg1, EventType<? extends Event> arg2) {
    super(arg0, arg1, arg2);
}

/**
 * getDevices will return current {@link Device} as ObservableList
 *
 * @return {@link ObservableList} of type {@link Device}
 */
public ObservableList getDev() {
    return devicesList;
}
/**
 * setDevices will set devicesList
 * @param devices ObservableList {@link Device}
 */
public void setDev(ObservableList devices) {
    this.devicesList = devices;
}
/**
 * get the result which is returned from calling saveProtokoll
 * @return result {@link SaveResult}
 */
public SaveResult getResult() {
    return result;
}
/**
 * set the result which is returned after calling saveMessprotokoll in RestCall
 * @param result {@link SaveResult}
 */
public void setResult(SaveResult result) {
    this.result = result;
}

在二类

public class SaveUtils {

private MainWindowController controller;
private ObservableList<RowContainerPruefvorschriftController> rows;
private Protokoll lastSavedProtokoll;
private Protokoll currentSavingProtokoll;

public SaveUtils(MainWindowController control){
    this.controller = control;
}

private void startSaving(){
    currentSavingProtokoll = createProtokoll();
    boolean state = controller.networkOnline.get() ? saveOnline() :saveOffline();
}

public void setRows(ObservableList<RowContainerPruefvorschriftController> rows) {
    this.rows = rows;
    //if rows get set start saveing the data
    startSaving();
}

private boolean saveOffline(){
    return false;
}
private boolean saveOnline() {
    RestCall call = controller.getCall();
    //call saveMessprotokoll and look what SaveResult returns
    SaveResult result = call.saveMessprotokoll(currentSavingProtokoll);
    //create ProtokollEvent to tell all consumers if all was ok
    ProtokollEvent save = new ProtokollEvent(ProtokollEvent.PROTOKOLL_SAVE_DONE);
    save.setResult(result);
    //HOW to fire/dispatch the ProtokollEvent here??????
    //TODO: need to fire this event and listen for it in other classes
    if(result.getResult()>0){
        controller.setLoggerMessage("SavedOnline->Protokoll-Nr.:"+result.getProtokollnr());
    }
    else {
        controller.setLoggerMessage("SavedOnline not successful->Error:"+result.getError_message());
    }        
    return true;
}

在 saveOnline 函数中，我创建了一个 ProtokollEvent 并将一些值传递给它。我现在想要的是触发或分派(dispatch)此事件，以便其他代码部分可以收听此事件。

我尝试使用 fireEvent()，但据我所知，Oracle-DOC 只有节点、Windows 和场景能够这样做。但是我怎么能用我的自定义类解决它呢？

另外我问自己 fireEvent 和 dispatchEvent 有什么区别？

Answer 1

找到解决方案。所有事件都可以通过静态方法触发

Event.fireEvent(EventTarget eventTarget,Event event)

其中 eventTarget 指定事件将经过的路径(取自 java 文档)。所以对于我的示例，我只是添加了以下行

Event.fireEvent(controller.getMainWindowBorderPane(),save);

是不是...