Java-JTextPane：KeyBindings在StyledEditorKit上不起作用

请看下面的代码

import java.awt.Color;    
import java.awt.Dimension;    
import java.awt.FlowLayout;    
import java.awt.event.ActionEvent;    
import java.awt.event.ActionListener;    
import java.awt.event.KeyEvent;
import java.util.ArrayList;    
import java.util.List;    
import java.util.logging.Level;    
import java.util.logging.Logger;    
import javax.swing.*;    
import javax.swing.text.*;    

    public class Form1 extends JFrame      
    {      
        private JTextPane textPane;      
        private JPanel south;    
        private JScrollPane scroll;      

        private String  content;      
        public String documentType;                


        private DefaultStyledDocument document;          
        int start, end, offset1,length1;         
        private JButton button;             
        JFrame frame;    


        public Form1()      
        {      

            //Declaring the instance variables      
            textPane = new JTextPane();      
            textPane.setMinimumSize(new Dimension(100,100));      

            button = new JButton("Bold");      
            button.addActionListener(new StyledEditorKit.BoldAction());     
             button.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_B,KeyEvent.CTRL_MASK),"key");
        button.getActionMap().put("key", new StyledEditorKit.BoldAction());

            document = (DefaultStyledDocument) textPane.getDocument();        




            //Creating the main window     
            south = new JPanel();      
            south.setLayout(new FlowLayout());      
            south.add(button);                          
            scroll = new JScrollPane(textPane);      

            getContentPane().add(scroll,"Center");      
            getContentPane().add(south,"South");                  

            setSize(800,600);    
            validate();    
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);                          
        }     


        private class Action extends AbstractAction    
        {      
            public void actionPerformed(ActionEvent ae)      
            {              
                new StyledEditorKit.BoldAction();
            }
        }      

       public static void main(String[] args) throws Exception {       
            SwingUtilities.invokeLater(new Runnable()       
            {        
              @Override        
              public void run() {        
               Form1 f = new Form1();  
               f.setVisible(true);
              }        
            });        
          }       
    }  

在这里,用户可以输入任何文本,当他选择文本并单击“粗体”按钮时,文本将为粗体.但是,我也需要使用CTRLB.如您所见,我的尝试并未对该关键事件做出任何回应.我什至尝试将其添加到扩展AbstractAction的单独的类中,但仍然不好.如何在此处实现CTRL B？请帮忙…

解决方法:

当键绑定对我不起作用时,我首先看的是InputMap －我确定我使用的是正确的键吗？好吧,你确定吗？默认值使用JComponent.WHEN_FOCUSED,因此仅在您的组件具有焦点时才起作用.

如果希望它在其他时间工作,例如说绑定的组件在焦点窗口中可见且在焦点窗口中但不一定具有焦点本身时,也许您应该尝试使用不同的条件参数.首先尝试使用JComponent.WHEN_IN_FOCUSED_WINDOW.

即

InputMap inputMap = myComponent.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);

标签：jtextpane,keyevent,swing,key-bindings,java
来源： https://codeday.me/bug/20191101/1982655.html