Java中的三态复选框 [英] Tristate Checkboxes in Java

问题描述

我真的可以在Java中使用一个三重复选框。这听起来像一个简单的事情，但我只看到了真正的丑陋的实现 [note：link now broken]。

I could really use a tri-stated checkbox in Java. It sounds like a simple thing, but I've only seen really ugly implementations [note: link now broken].

三个单选按钮占用了太多的房地产，可能会让我的用户感到困惑。它基本上是一个搜索对话框。我需要真，假或不关心选项。有人使用不同的技术吗？

Three radio buttons just take up too much real estate and will probably be confusing for the users in my case. It's basically for a search dialog. I need true, false or "don't care" options. Is there a different technique that people use?

推荐答案

我发现了一个方法来通过简单地添加一个监听器：

I found a way to make a tri-state checkbox by simply adding a listener:

public class TriStateActionListener implements ActionListener{
    final protected Icon icon;

    public TriStateActionListener(Icon icon){
        this.icon=icon;
    }

    public static Boolean getState(javax.swing.JCheckBox cb){
        if (cb.getIcon()==null) return null;
        if (cb.isSelected()) return true;
        else return false;
    }

    public void actionPerformed(ActionEvent e) {
        javax.swing.JCheckBox cb=(javax.swing.JCheckBox)e.getSource();
        if (!cb.isSelected()){
            cb.setIcon(icon);
        }
        else if (cb.getIcon()!=null){
            cb.setIcon(null);
            cb.setSelected(false);
        }
    }
}

然后在应用程序代码中，它只是一行：

Then in the application code, it's just a single line:

jCheckBox1.addActionListener(new TriStateActionListener(getResourceMap().getIcon("TriStateIcon")));

经过所有反馈，我认为下拉菜单可能是更好的选择。但是，我想在这里为其他人分享我的代码。

After all the feedback, I'm thinking a drop-down may be a better choice. But, I wanted to share my code here for everyone else.

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