Java SwingUtilities.invokeLater

Question

.addActionListener(new ActionListener(){
        public void actionPerformed (ActionEvent e){
            try{
                ta.append("Searching Initiated at: "+datetime()+"\n");
                gui.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
                task.execute();
                javax.swing.SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        gui.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
                    }
                });
                //Enable the next stage in the YD process and disable the previously executed functions
                clusAn.setEnabled(true);
                open.setEnabled(false);
                statCl.setEnabled(false);
            }catch (Exception IOE){
                }
        }
    });

嗨,我设计的这个应用程序的最后阶段有点痛苦.

基本上,当用户点击按钮时,我会喜欢它,所以光标变成'等待'版本,然后一旦后台进程(task.execute)完成,光标就会恢复正常.

task.execute不在同一个类中,因此我不能直接调用"gui.setCursor",因为它不能将GUI识别为变量.

不知道该怎么做,所以任何建议都会很棒

感谢:D

Answer 1

修改任务的类,使其将GUI作为构造函数参数.这样,当任务完成时,它可以调用该setCursor方法.

你应该使用SwingWorker来做这种事情.

编辑:

以下是任务代码的编写方式:

public class MySwingWorker extends SwingWorker<Void, Void> {

    /**
     * The frame which must have the default cursor set 
     * at the end of the background task
     */
    private JFrame gui;

    public MySwingWorker(JFrame gui) {
        this.gui = gui;
    }

    // ...

    @Override
    protected void done() {
        // the done method is called in the EDT. 
        // No need for SwingUtilities.invokeLater here
        gui.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
    }
}