在SWT的Label中点击实现倒计时，当倒计时结束时再次点击Label框再次开始倒计时，当倒计时没有结束时再次点击Label框会在控制面板输出'请等待'

这是一个可能的实现方式：

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

public class CountDownLabel {
    private static final int COUNTDOWN_SECONDS = 10;
    private static final Color COLOR_DEFAULT = Display.getDefault().getSystemColor(SWT.COLOR_BLACK);
    private static final Color COLOR_WAITING = Display.getDefault().getSystemColor(SWT.COLOR_GRAY);
    private static final Font FONT_DEFAULT = new Font(Display.getDefault(), new FontData("Arial", 24, SWT.BOLD));
    private static final Font FONT_WAITING = new Font(Display.getDefault(), new FontData("Arial", 24, SWT.NORMAL));

    private Display display;
    private Shell shell;
    private Label label;
    private int countdownSeconds;
    private boolean isCountingDown;

    public CountDownLabel() {
        display = new Display();
        shell = new Shell(display);
        shell.setText("CountDown Label");
        shell.setLayout(new GridLayout());

        label = new Label(shell, SWT.CENTER);
        label.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
        label.setForeground(COLOR_DEFAULT);
        label.setFont(FONT_DEFAULT);

        label.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseUp(MouseEvent e) {
                if (isCountingDown) {
                    System.out.println("请等待");
                } else {
                    startCountdown();
                }
            }
        });

        countdownSeconds = 0;
        isCountingDown = false;
    }

    public void open() {
        shell.setSize(300, 200);
        shell.open();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }

        FONT_DEFAULT.dispose();
        FONT_WAITING.dispose();
        display.dispose();
    }

    private void startCountdown() {
        countdownSeconds = COUNTDOWN_SECONDS;
        isCountingDown = true;
        label.setForeground(COLOR_WAITING);
        label.setFont(FONT_WAITING);
        updateLabel();

        new Thread(() -> {
            while (countdownSeconds > 0) {
                countdownSeconds--;
                display.asyncExec(this::updateLabel);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            display.asyncExec(this::resetLabel);
        }).start();
    }

    private void updateLabel() {
        label.setText(String.valueOf(countdownSeconds));
    }

    private void resetLabel() {
        isCountingDown = false;
        label.setForeground(COLOR_DEFAULT);
        label.setFont(FONT_DEFAULT);
        label.setText("Click to start countdown");
    }

    public static void main(String[] args) {
        CountDownLabel countDownLabel = new CountDownLabel();
        countDownLabel.open();
    }
}

这个程序创建了一个窗口，其中包含一个Label控件。当用户点击Label时，如果倒计时正在进行，则控制面板输出“请等待”，否则开始倒计时。倒计时从10秒开始，每秒更新Label的文本，直到计时结束。在计时结束后，Label会回到初始状态，等待下一次点击开始新的倒计时。在计时过程中，Label的前景色变为灰色，字体变为普通，以表示当前不可用。