java swing 清除事件队列

Question

是否可以以标准方式做到这一点？

这是场景。

1. 开始在 EDT 中做一些昂贵的事情（EDT 被阻塞，直到昂贵的操作结束）。

2. 当 EDT 被阻止时，用户继续单击/拖动鼠标按钮。所有鼠标操作都记录在某处。

3. 当 EDT 空闲时（处理完昂贵的内容），它开始处理鼠标事件。

我在步骤 3 中想要的是丢弃已经堆积的鼠标事件。 EDT 空闲后，任何新的鼠标事件都应以通常的方式处理。

关于如何实现这一目标的任何想法。

PS：我不可能阻止 EDT 被阻止（我不控制程序中某些模块的行为）。

编辑： 如果我可以安全地调用“SunToolkit.flushPendingEvents()”，那么我总是可以在 EDT 中开始昂贵的操作之前放置一个玻璃板。在 EDT 线程上昂贵的操作结束后，刷新所有事件 - 它们将进入一个不会执行任何操作的玻璃窗格。然后让 EDT 正常工作。

编辑2： 我添加了 SSCCE 来演示该问题。

public class BusyCursorTest2 extends javax.swing.JFrame {

    public BusyCursorTest2() {

        javax.swing.JButton wait = new javax.swing.JButton("Wait 3 seconds");
        getContentPane().setLayout(new java.awt.GridLayout(2, 1, 0, 0));
        getContentPane().add(wait);
        getContentPane().add(new javax.swing.JToggleButton("Click me"));
        setTitle("Busy Cursor");
        setSize(300, 200);
        setDefaultCloseOperation(javax.swing.JFrame.DISPOSE_ON_CLOSE);
        setVisible(true);

        wait.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent event) {

                final java.util.Timer timer = switchToBusyCursor(BusyCursorTest2.this);

                try {
                    //do something expensive in EDT
                    try {
                        Thread.sleep(3000);
                    } catch (InterruptedException e) {
                        //do nothing
                    }
                } finally {
                    switchToNormalCursor(BusyCursorTest2.this, timer);
                }
            }

        });
    }

    public static java.util.Timer switchToBusyCursor(final javax.swing.JFrame frame) {
        startEventTrap(frame);
        java.util.TimerTask timerTask = new java.util.TimerTask() {

            public void run() {
                startWaitCursor(frame);
            }

        };
        final java.util.Timer timer = new java.util.Timer();
        timer.schedule(timerTask, DELAY_MS);
        return timer;
    }

    public static void switchToNormalCursor(final javax.swing.JFrame frame, final java.util.Timer timer) {
        timer.cancel();
        stopWaitCursor(frame);
        stopEventTrap(frame);
    }

    private static void startWaitCursor(javax.swing.JFrame frame) {
        frame.getGlassPane().setCursor(java.awt.Cursor.getPredefinedCursor(java.awt.Cursor.WAIT_CURSOR));
        frame.getGlassPane().addMouseListener(mouseAdapter);
        frame.getGlassPane().setVisible(true);
    }

    private static void stopWaitCursor(javax.swing.JFrame frame) {
        frame.getGlassPane().setCursor(java.awt.Cursor.getPredefinedCursor(java.awt.Cursor.DEFAULT_CURSOR));
        frame.getGlassPane().removeMouseListener(mouseAdapter);
        frame.getGlassPane().setVisible(false);
    }

    private static void startEventTrap(javax.swing.JFrame frame) {
        frame.getGlassPane().addMouseListener(mouseAdapter);
        frame.getGlassPane().setVisible(true);
    }

    private static void stopEventTrap(javax.swing.JFrame frame) {
        frame.getGlassPane().removeMouseListener(mouseAdapter);
        frame.getGlassPane().setVisible(false);
    }

    private static final java.awt.event.MouseAdapter mouseAdapter = new java.awt.event.MouseAdapter() {
    };

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                new BusyCursorTest2();
            }

        });

    }

    private static final int DELAY_MS = 250;

}

1. 运行 SSCCE

2. 单击“等待 3 秒”按钮。它模拟了昂贵的操作。鼠标光标将变为忙碌状态。

3. 当光标忙碌时，单击切换按钮“Click me”。如果三秒后，切换按钮更改其状态，则切换按钮已接收鼠标事件并且未被捕获。

我希望当光标看起来很忙时，生成的鼠标（和其他）事件被丢弃。

谢谢。

Answer 1

好吧，我终于把一切都搞定了。我发布 SSCCE 以获得正确工作的示例。诀窍是使用“javax.swing.SwingUtilities.invokeLater()”方法隐藏玻璃窗格。将必要的代码包装在 Runnable 中，然后使用 invokeLater 调用它。在这种情况下，Swing 会处理所有鼠标事件（因为玻璃窗格拦截了这些事件，所以什么也没发生），然后隐藏玻璃窗格。这里是 SSCCE。

public class BusyCursorTest2 extends javax.swing.JFrame {

    public BusyCursorTest2() {

        javax.swing.JButton wait = new javax.swing.JButton("Wait 3 seconds");
        getContentPane().setLayout(new java.awt.GridLayout(2, 1, 0, 0));
        getContentPane().add(wait);
        getContentPane().add(new javax.swing.JToggleButton("Click me"));
        setTitle("Busy Cursor");
        setSize(300, 200);
        setDefaultCloseOperation(javax.swing.JFrame.DISPOSE_ON_CLOSE);
        setVisible(true);

        wait.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent event) {

                final java.util.Timer timer = switchToBusyCursor(BusyCursorTest2.this);

                try {
                    //do something expensive in EDT or otherwise
                    try {
                        Thread.sleep(3000);
                    } catch (InterruptedException e) {
                        //do nothing
                    }
                } finally {
                    switchToNormalCursorEventThread(BusyCursorTest2.this, timer);
                }

            }

        });
    }

    public static java.util.Timer switchToBusyCursor(final javax.swing.JFrame frame) {
        startEventTrap(frame);
        java.util.TimerTask timerTask = new java.util.TimerTask() {

            public void run() {
                startWaitCursor(frame);
            }

        };
        final java.util.Timer timer = new java.util.Timer();
        timer.schedule(timerTask, DELAY_MS);
        return timer;
    }

    public static void switchToNormalCursorEventThread(final javax.swing.JFrame frame, final java.util.Timer timer) {

        Runnable r = new Runnable() {

            public void run() {
                switchToNormalCursor(frame, timer);
            }

        };

        javax.swing.SwingUtilities.invokeLater(r);

    }

    public static void switchToNormalCursor(final javax.swing.JFrame frame, final java.util.Timer timer) {
        timer.cancel();
        stopWaitCursor(frame);
        stopEventTrap(frame);
    }

    private static void startWaitCursor(javax.swing.JFrame frame) {
        frame.getGlassPane().setCursor(java.awt.Cursor.getPredefinedCursor(java.awt.Cursor.WAIT_CURSOR));
        frame.getGlassPane().addMouseListener(mouseAdapter);
        frame.getGlassPane().setVisible(true);
    }

    private static void stopWaitCursor(javax.swing.JFrame frame) {
        frame.getGlassPane().setCursor(java.awt.Cursor.getPredefinedCursor(java.awt.Cursor.DEFAULT_CURSOR));
        frame.getGlassPane().removeMouseListener(mouseAdapter);
        frame.getGlassPane().setVisible(false);
    }

    private static void startEventTrap(javax.swing.JFrame frame) {
        frame.getGlassPane().addMouseListener(mouseAdapter);
        frame.getGlassPane().setVisible(true);
    }

    private static void stopEventTrap(javax.swing.JFrame frame) {
        java.awt.Toolkit.getDefaultToolkit().getSystemEventQueue();
        frame.getGlassPane().removeMouseListener(mouseAdapter);
        frame.getGlassPane().setVisible(false);
    }

    private static final java.awt.event.MouseAdapter mouseAdapter = new java.awt.event.MouseAdapter() {
    };

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                new BusyCursorTest2();
            }

        });

    }

    private static final int DELAY_MS = 250;

}

再次强调，如果可能的话，不得阻止 EDT。但如果必须的话，您可以像上面那样拥有一个工作繁忙的光标。

欢迎任何评论。

Answer 2

阅读这篇文章。

基本上，长时间运行的任务不应该在 EDT 上完成。 Java 为此类任务提供了 SwingWorker。

我会更详细地讨论，但你往往不接受答案。

Answer 3

绝对不要阻止 EDT。你绝对不应该这样做！

这是一个简单的实用程序类来执行此操作（归功于 Santosh Tiwari）：

import java.awt.Component;
import java.awt.Cursor;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Timer;
import java.util.TimerTask;

import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

/**
 * When blocking the EDT (Event Queue) in swing, the cursor won't update, and windows won't render.
 * This should show the hourglass even when you're blocking the EDT.
 *
 * Source:
 * https://stackoverflow.com/questions/7085239/java-swing-clear-the-event-queue
 * 
 * @author Kieveli, Santosh Tiwari
 *
 */
public class BlockingWaitCursor {

   private static final java.awt.event.MouseAdapter mouseAdapter = new java.awt.event.MouseAdapter() {};

   /**
    * The Dialog or main window is required to show the cursor and animate it. The actionListener is called
    * as soon as initial setup is completed and the animation timer is running.
    * @param currentComponent A panel, dialog, frame, or any other swing component that is the current focus
    * @param action Your action to perform on the EDT. This is started extremely quickly and without delay.
    */
   public static void showWaitAndRun(Component currentComponent, ActionListener action ) {

      Timer timer = setupWaitCursor(currentComponent);

      try {
         // now allow our caller to execute their slow and delayed code on the EDT
         ActionEvent event = new ActionEvent(BlockingWaitCursor.class, ActionEvent.ACTION_PERFORMED, "run");
         action.actionPerformed(event);
      }
      finally {
         resetWaitCursor(currentComponent, timer);
      }
   }

   private static Timer setupWaitCursor(Component currentComponent) {
      final Component glassPane = findGlassPane(currentComponent);
      if ( glassPane == null ) {
         return null;
      }

      // block mouse-actions with a glass pane that covers everything
      glassPane.addMouseListener(mouseAdapter);
      glassPane.setVisible(true);

      // animate the wait cursor off of the EDT using a generic timer.
      Timer timer = new Timer();
      timer.schedule( new TimerTask() {
         @Override
         public void run() {
            glassPane.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
            glassPane.addMouseListener(mouseAdapter);
            glassPane.setVisible(true);
         }

      }, 250l);

      return timer;
   }

   private static void resetWaitCursor(Component currentComponent, final Timer timer) {
      final Component glassPane = findGlassPane(currentComponent);
      if ( glassPane == null ) {
         return;
      }
      // Invoke later so that the event queue contains user actions to cancel while the loading occurred
      SwingUtilities.invokeLater(new Runnable() {
         @Override
         public void run() {
            if ( timer != null )
               timer.cancel();
            Toolkit.getDefaultToolkit().getSystemEventQueue();
            glassPane.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
            glassPane.removeMouseListener(mouseAdapter);
            glassPane.setVisible(false);  
         }
      });
   }

   private static Component findGlassPane(Component currentComponent) {
      // try to locate the glass pane by looking for a frame or dialog as an ancestor
      JFrame frame = findFrame(currentComponent);
      JDialog dialog = findDialog(currentComponent);
      Component glassPane = null;
      if ( frame != null )
         glassPane = frame.getGlassPane();
      if ( dialog != null )
         glassPane = dialog.getGlassPane();
      return glassPane;
   }

   private static JFrame findFrame(Component currentComponent) {
      // find the frame if it exists - it may be the currentComponent
      if ( currentComponent instanceof JFrame )
         return (JFrame) currentComponent;

      Window window = SwingUtilities.getWindowAncestor(currentComponent);
      if ( window == null )
         return null;
      if ( ! (window instanceof JFrame) )
         return null;
      return (JFrame)window;
   }

   private static JDialog findDialog(Component currentComponent) {
      // find the dialog if it exists - it may be the currentComponent
      if ( currentComponent instanceof JDialog )
         return (JDialog) currentComponent;

      Window window = SwingUtilities.getWindowAncestor(currentComponent);
      if ( window == null )
         return null;
      if ( ! (window instanceof JDialog) )
         return null;
      return (JDialog)window;
   }

}

但永远不要使用它。好吧，除非您不自豪并编写了一个快速实用程序，然后失控并成为主要应用程序，并且您没有时间将代码分开来弄清楚什么可以在工作人员上运行，以及什么可以在工作人员上运行。由于与非线程安全的 swing / sql 的集成而中断。