Question

我正在尝试从内部类中触发事件，但它无法正常工作。这是我的代码：

摘要模型：

public abstract class AbstractModel {

    public PropertyChangeSupport propertyChangeSupport;

    public AbstractModel() {
        propertyChangeSupport = new PropertyChangeSupport(this);
    }

    public void addPropertyChangeListener(PropertyChangeListener listener) {
        propertyChangeSupport.addPropertyChangeListener(listener);
    }

    public void removePropertyChangeListener(PropertyChangeListener listener) {
        propertyChangeSupport.removePropertyChangeListener(listener);
    }

    protected void firePropertyChange(String propertyName, Object oldValue,
            Object newValue) {
        propertyChangeSupport.firePropertyChange(propertyName, oldValue,
                newValue);
    }
}

MODEL：

public class GUImodel extends AbstractModel {

    // Variables
    private final ArrayList tempResultsTable = new ArrayList();
    private static boolean done;

    //
    // RUN PROGRAM
    //

    public ArrayList run(ArrayList iF) {

        try {
            final BackgroundThread myThread = new BackgroundThread();
            myThread.init(iF);
            myThread.execute();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return tempResultsTable;
    }

    public void done() {
        System.out.println("done() called");
        boolean oldValue = done;
        done = true;
        firePropertyChange(GUIcontroller.DONE_PROPERTY, oldValue, done);
    }


    class BackgroundThread extends SwingWorker<Void, Void> {

        private ArrayList inputsFilesDataList;

        public void init(ArrayList iF) {
            inputsFilesDataList = iF;
            done = false;
        }

        @Override
        public Void doInBackground() throws Exception {

            for (int i = 0; i < inputsFilesDataList.size(); i++) {
                System.out.println(i);
            }
            return null;
        }

        @Override
        protected void done() {
            try {
                boolean oldValue = done;
                done = true;
                firePropertyChange(GUIcontroller.DONE_PROPERTY, oldValue, done);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}

查看：

public class GUIview{
   ...
   public void propertyChange(final PropertyChangeEvent event) {
        if (event.getPropertyName().equals(GUIcontroller.DONE_PROPERTY)) {
            String newTab = (String)event.getNewValue();
            updateTab(newTab);
        }
   }
   ...
}

摘要控制器：

public abstract class AbstractController implements PropertyChangeListener {

    public final ArrayList<AbstractFrame> registeredViews;
    public final ArrayList<AbstractModel> registeredModels;

public AbstractController() {
    registeredViews = new ArrayList();
    registeredModels = new ArrayList();
}

public void addModel(AbstractModel model) {
    registeredModels.add(model);
    model.addPropertyChangeListener(this);
}

public void removeModel(AbstractModel model) {
    registeredModels.remove(model);
    model.removePropertyChangeListener(this);
}

public void addView(GUIview view) {
    registeredViews.add(view);
}

public void removeView(AbstractFrame view) {
    registeredViews.remove(view);
}

@Override
public void propertyChange(PropertyChangeEvent event) {
    for (AbstractFrame view : registeredViews) {
        view.propertyChange(event);
        }
    }
}

CONTROLLER

public class GUIcontroller extends AbstractController {

public static final String DONE_PROPERTY = "done";
ArrayList inputsFilesList = m_model.loadFromExcel();    
    @Override
    public void propertyChange(PropertyChangeEvent event) {

        if (event.getPropertyName().equals(GUIcontroller.DONE_PROPERTY)) {          
            m_view.getResultsModel().updateResultsTableDataList(
                    m_model.getTempResultsTable());
        } else {
            for (AbstractFrame view : registeredViews) {
                view.propertyChange(event);
            }
        }
    }

     public runProgram(){
          m_model.run(inputsFilesList);
     }


}

MAIN。

public class GUImain {

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    createGUI();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public static void createGUI() {

        InputsModel inputsModel = new InputsModel();
        ResultsModel resultsModel = new ResultsModel();

        GUImodel model = new GUImodel();

        GUIcontroller controller = new GUIcontroller();
        controller.addModel(model);

        GUIview view = new GUIview(controller, model, inputsModel, resultsModel);

        controller.addControllerListerners();

        view.setVisible(true);
    }
}

关于这个问题的任何想法？

我需要在后台线程中运行一些方法，因此我使用的是扩展SwingWorker的内部类。该线程完成后，我需要触发一个事件来向控制器报告一些更改。

未执行done（）方法中的“firePropertyChange（...）”行。

相关问题：如果某个类ClassA扩展了ClassAA，并且其内部类ClassB扩展了ClassBB，那么内部类ClassB是否也扩展了ClassAA？

Answer 1

添加PropertyChangeListener to instance of SwingWorker，并且没有为Swing Listener实施其他SwingWorker
SwingWorker从DONE

PENDING

STARTED

PropertyChangeListener

public void propertyChange(PropertyChangeEvent event) {

您也可以将Model和View分配给done()，process()，publish() { {1}}保证输出在Event Dispatch Thread

Answer 2

愚蠢的疯狂猜测：

您是否将侦听器添加到 正确的SwingPropertyChangeSupport对象 ？这必须是AbstractModel持有的对象，而不是BackgroundThread。换句话说，为了让您的侦听器能够接收属性已更改的通知，他们必须将其PropertyChangeListener添加到AbstractModel，并且您的BackgroundThread类必须具有执行此操作的方法。

（修改）
要么从您的AbstractModel类中删除PropertyChangeSupport，要么只使用由mKorbel建议的SwingWorker持有的PropertyChangeSupport。他的回答是1+。

另外，您的问题在代码/信息方面存在严重缺陷，无法在当前状态下获得真正知识渊博的答案，我们所能做的就是猜测可能存在的问题及其答案。在这里提问时，请考虑我们的观点，问自己哪些人需要能够完全理解问题并回答问题。

修改2

您的代码证明我的假设实际上是正确的，您正在将PropertyChangeListener添加到错误的PropertyChangeSupport对象中，以便SwingWorker中的通知 - 从未将PropertyChangeListener分配给其支持 - 将不起作用在已添加到AbstractModel的suport对象的侦听器上。

这：

firePropertyChange(GUIcontroller.DONE_PROPERTY, oldValue, done);

在SwingWorker的SwingPropertyChangeSupport对象上调用，而不是在AbstractModel的对象上调用。

一个可能的解决方案是将您的火灾方法更改为：

GUImodel.this.firePropertyChange(GUIcontroller.DONE_PROPERTY, oldValue, done);

以便正确的支持对象通知正确的侦听器。

编辑3
我的SSCCE（比真正的SSCCE稍长一点）证明了我的论点：

import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.SwingWorker; import javax.swing.event.SwingPropertyChangeSupport; public class MvcSscce { public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { createGUI(); } catch (Exception e) { e.printStackTrace(); } } }); } public static void createGUI() { GUImodel model = new GUImodel(); GUIcontroller controller = new GUIcontroller(); controller.addModel(model); GUIview view = new GUIview(controller); view.setVisible(true); } } class GUIview { private JPanel mainPanel = new JPanel(); private JFrame frame = new JFrame("Fubar"); public GUIview(AbstractController controller) { mainPanel.add(new JButton(controller.getButtonAction())); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(mainPanel); frame.pack(); frame.setLocationRelativeTo(null); } public void setVisible(boolean visible) { frame.setVisible(visible); } } abstract class AbstractModel { // note this should be a SwingPropertyChangeSupport public SwingPropertyChangeSupport propertyChangeSupport; public abstract void run(); public AbstractModel() { propertyChangeSupport = new SwingPropertyChangeSupport(this); } public void addPropertyChangeListener(PropertyChangeListener listener) { propertyChangeSupport.addPropertyChangeListener(listener); } public void removePropertyChangeListener(PropertyChangeListener listener) { propertyChangeSupport.removePropertyChangeListener(listener); } protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) { propertyChangeSupport.firePropertyChange(propertyName, oldValue, newValue); } } class GUImodel extends AbstractModel { private boolean done = false; public void run() { done = false; final BackgroundThread myThread = new BackgroundThread(); myThread.execute(); } private class BackgroundThread extends SwingWorker<Void, Void> { private static final long SLEEP_TIME = 2000; @Override protected Void doInBackground() throws Exception { Thread.sleep(SLEEP_TIME); return null; } @Override protected void done() { System.out.println("done() called"); boolean oldValue = done; done = true; // fire both property change listeners and see what gets notified firePropertyChange(GUIcontroller.DONE_PROPERTY, oldValue, done); GUImodel.this.firePropertyChange(GUIcontroller.DONE_PROPERTY_2, oldValue, done); } } } class AbstractController implements PropertyChangeListener { private AbstractModel model; public void addModel(AbstractModel model) { this.model = model; model.addPropertyChangeListener(this); } public Action getButtonAction() { @SuppressWarnings("serial") Action buttonAction = new AbstractAction("Press Me") { @Override public void actionPerformed(ActionEvent arg0) { model.run(); } }; return buttonAction; } @Override public void propertyChange(PropertyChangeEvent evt) { String output = String.format("Evt: %s, newValue: %s", evt.getPropertyName(), evt.getNewValue()); System.out.println(output); } } class GUIcontroller extends AbstractController { public static final String DONE_PROPERTY_2 = "done property 2"; public static final String DONE_PROPERTY = "done property"; }

请注意，延迟2秒后，将通知侦听器，但仅通知DONE_PROPERTY_2属性，而不是DONE_PROPERTY。

从内部类触发事件，扩展SwingWorker

2 个答案: