Question

我试图在下面调用此事件;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;但是使用键绑定或单击按钮进行搜索的事件不起作用，当然我做错了但我不知道是什么因为我有点新的Java。请有人帮帮我吗？

SearchScreen：

public class SearchScreen extends EventSearch{

    public static void main (String[] args){

        SearchScreen s= new SearchScreen();
    }

    public void SearchScreen(){

        TabBuilder tb = new TabBuilder();
          tb.searchTab();       
    }
}

EventSearch：

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.");
                }   
            }
        };
     }

TabBuilder：

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();

            }
        }

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

如果您的KeyBinding发生了类似情况，请将操作添加到txtSearch，然后您会询问来源是e.getSource()==btSearch

对于KeyBindings，您可以使用常量来指定何时必须绑定。 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

事件调用不适用于键绑定或单击 - 什么是逻辑错误？

SearchScreen：

EventSearch：

TabBuilder：

1 个答案: