Java - 如何防止 WindowClosing 实际关闭窗口

Java - how do I prevent WindowClosing from actually closing the window(Java - 如何防止 WindowClosing 实际关闭窗口)

问题描述

对大多数人来说，我似乎有相反的问题.我有以下非常标准的代码来查看用户是否想在关闭窗口之前进行一些保存:

I seem to have the reverse problem to most people. I have the following pretty standard code to see if the user wants to do some saves before closing the window:

  frame.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
  frame.addWindowListener(new WindowAdapter() {
     public void windowClosing(WindowEvent ev) {
      boolean close = true;
         // check some files, asking if the user wants to save
         // YES and NO handle OK, but if the user hits Cancel on any file,
         //   I want to abort the close process     
         // So if any of them hit Cancel, I set "close" to false
      if (close) {
          frame.dispose();
          System.exit(0);
         }
       }            
});

无论我尝试什么，当我退出 windowClosing 时，窗口总是关闭.将 WindowAdapter 更改为 WindowListener 没有任何区别.奇怪的是，文档明确指出如果程序在处理此事件时没有明确隐藏或处置窗口，则窗口关闭操作将被取消"，但它对我来说不起作用.还有其他方法可以处理框架上的 x 吗?TIA

No matter what I try, the window always closes when I come out of windowClosing. Changing WindowAdapter to WindowListener doesn't make any difference. What is weird is that the documentation explicitly says "If the program does not explicitly hide or dispose the window while processing this event, the window close operation will be cancelled," but it doesn't work that way for me. Is there some other way of handling the x on the frame? TIA

推荐答案

我刚刚尝试了这个最小的测试用例:

I've just tried this minimal test case:

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.WindowConstants;

public class Test {

    public static void main(String[] args) {
        final JFrame frame = new JFrame("Test");
        frame.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent ev) {
                //frame.dispose();
            }
        });
        frame.setVisible(true);
    }

}

如果我保留 dispose 调用的注释并点击关闭按钮，则窗口不会退出.取消注释并点击关闭按钮，窗口关闭.

If I keep the dispose call commented, and hit the close button, the window doesn't exit. Uncomment that and hit the close button, window closes.

我不得不猜测你设置关闭"的逻辑有问题.多变的.尝试仔细检查.

I'd have to guess that something is wrong in your logic to set your "close" variable. Try double checking that.

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