使用JFileChooser的Java KeyBindings [英] Java KeyBindings with JFileChooser

问题描述

我想将键绑定添加到我的 JFileChooser ，以便在按下SPACE键时打开文件预览窗口。

I would like to add Key bindings to my JFileChooser in order to open a file preview window when the SPACE key is pressed.

由于源代码太大，我只做了一个简单的脏代码：

Because of the source code is too big, I just did a simple dirty code :

MainWindow.java

package test;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MainWindow extends JFrame {    
    public MainWindow() {
        this.setTitle("Test Window");
        Dimension dim = new Dimension(800, 600);
        this.setSize(dim);
        this.setPreferredSize(dim);

        MainPanel pane = new MainPanel(dim);

        Action damned = new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JOptionPane.showMessageDialog(null,
                    "It Works !");
            }
        };

        pane.getInputMap().put(KeyStroke.getKeyStroke("SPACE"), "damned");
        pane.getActionMap().put("damned", damned);

        this.setContentPane(pane);
        this.setVisible(true);
    }
}

MainPanel.java

package test;

import java.awt.*;
import javax.swing.*;

public class MainPanel extends JFileChooser { 
    public MainPanel(Dimension dim) {  
        this.setSize(dim);
        this.setPreferredSize(dim);    
    }
}

Test.java

package test;

public class Test {
    public static void main(String[] args) {
        new MainWindow();
    }
}

如果我使用的是JPanel而不是JFileChooser，那么工作。

If I use a JPanel instead of a JFileChooser, it works.

谢谢，

Revan

推荐答案

问题是InputMap的类型：默认情况下（没有参数），即WHEN_FOCUSED。由于选择器本身很少聚焦，因此无法找到绑定。而是在WHEN_ANCESTOR中绑定...

the problem is the type of InputMap: by default (that is without parameter), that's WHEN_FOCUSED. As the chooser itself is rarely focused, the binding will not be found. Instead bind in WHEN_ANCESTOR...

       pane.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT)
           .put(KeyStroke.getKeyStroke("F1"), "damned");

如你所见，我用F1代替SPACE：需要空间（因此被吃掉）通过文本字段输入名称

As you see here, I replaced the SPACE by F1: the space is needed (and thus eaten) by the textfield which takes the name input

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