事件调用不适用于键绑定或单击 - 逻辑错误是什么？

Question

我正在尝试在下面调用此事件；我使用 TabBuilder 创建框架（因为它是我的应用程序的一部分），然后它调用弹出的搜索屏幕；但是使用键绑定或简单单击按钮的搜索事件不起作用，当然我做错了，但我不知道是什么，因为我对 Java 有点陌生。请问谁能帮帮我？

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搜索屏幕：

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public class SearchScreen extends EventSearch{
    
    public static void main (String[] args){
    
        SearchScreen s= new SearchScreen();
    }
    
    public void SearchScreen(){
    
        TabBuilder tb = new TabBuilder();
          tb.searchTab();       
    }
}

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事件搜索：

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public class EventSearch extends TabBuilder{
    String userQuery;
    String key = "ENTER";
    KeyStroke keyStroke = KeyStroke.getKeyStroke(key);
    
    public EventSearch(){
    
        btSearch.addActionListener(this);
        txtSearch.getInputMap().put(keyStroke, key);
        txtSearch.getActionMap().put(key, enterAction);
    }
    
    Action enterAction = new AbstractAction() {
        @Override
        public void actionPerformed(ActionEvent e) {
        try{
            System.out.println("worked");
                } catch (IOException e1) {
                    e1.printStackTrace(); //print failure
                    JOptionPane.showMessageDialog(null, "HTTP request failure.");
                }   
            }
        };
     }

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标签生成器：

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public class TabBuilder implements ActionListener {

    protected JButton btSearch;
    JMenuItem close, search;
    protected JTextField txtSearch;
    protected JFrame searchFrame = new JFrame();
    
    public void TabBuilder(){
    }
    
    public void searchTab(){
    
        JLabel lbSearch;
        JPanel searchPane;
        
        btSearch= new JButton("Search");
        lbSearch= new JLabel("Type Keywords in english to be searched below:");
        lbSearch.setHorizontalAlignment(SwingConstants.CENTER);
        txtSearch= new JTextField();
        searchPane=new JPanel();
        searchPane.setBackground(Color.gray);
        searchPane.add(lbSearch);
        searchPane.add(txtSearch);
        searchPane.add(btSearch);
        searchPane.setLayout(new GridLayout(3,3));
        btSearch.setEnabled(true);
        searchFrame.add(searchPane);
        searchFrame.setTitle("SHST");
        searchFrame.setSize(400, 400);
        searchFrame.setVisible(true);
        searchFrame.setDefaultCloseOperation(1);
    }
    
    public void actionPerformed(ActionEvent e){
        if(e.getSource()==close){
            System.exit(0);
        }
        if(e.getSource()==search){
            SearchScreen s = new SearchSreen();
        }
    }
}

Answer 1

你写这个actionListener

public void actionPerformed(ActionEvent e){
            if(e.getSource()==close){
                System.exit(0);
        }

            if(e.getSource()==search){
                TabBuilder tb = new TabBuilder();
                tb.searchTab();

            }
        }

如果您添加到 btnSearch.addActionListener(this) ，您的 actionListener 将永远不会做任何事情。

对于您的KeyBinding 发生类似的事情，您将操作添加到txtSearch，然后您询问来源是否是e.getSource()==btSearch

对于KeyBindings，您可以使用常量来指定何时必须绑定它们。 JComponent.WHEN_FOCUSED、JComponent.WHEN_IN_FOCUSED_WINDOW、JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT

例如：

txtSearch.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(keyStroke, key);

How to use KeyBindings