使用swing在java中为JButton创建热键

Question

我使用以下代码使用swing为java表单创建热键.如果我按ALT + N,ALT + R,ALT + 1,ALT + 2,光标将移动到正确的文本字段,并在相应的文本字段中输入值.它工作正常.我的问题是,我保存并以这种形式退出JButton如果.我按CTRL + S表示同时选择保存按钮如果按CTRL + X表示将选择退出按钮.如何为JButton创建助记符？如何使用以下代码执行CTRL + S,CTRL + X？

提前致谢.

package hotkeys;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
public class hotkey extends JFrame {
    public static void main(String arg[]) {
        JLabel Name = new JLabel("Name");
        JTextField tf1 = new JTextField(20);
        Name.setLabelFor(tf1);
        Name.setDisplayedMnemonic('N');


        JLabel Regno = new JLabel("RegNO");
        JTextField tf2 = new JTextField(20);
        Regno.setLabelFor(tf2);
        Regno.setDisplayedMnemonic('R');

        JLabel Mark1 = new JLabel("Mark1");
        JTextField tf3 = new JTextField(20);
        Mark1.setLabelFor(tf3);
        Mark1.setDisplayedMnemonic('1');

        JLabel Mark2 = new JLabel("Mark2");
        JTextField tf4 = new JTextField(20);
        Mark2.setLabelFor(tf4);
        Mark2.setDisplayedMnemonic('2');


        JButton b1 = new JButton("Save");
        JButton b2 = new JButton("eXit");


        JFrame f = new JFrame();
        JPanel p = new JPanel();

        p.add(Name);
        p.add(tf1);
        p.add(Regno);
        p.add(tf2);
        p.add(Mark1);
        p.add(tf3);
        p.add(Mark2);
        p.add(tf4);
        p.add(b1);
        p.add(b2);

        f.add(p);
        f.setVisible(true);
        f.pack();
    }
}

Answer 1

您需要在按钮的组件输入映射中注册keyBinding.在代码中(重复你在之前的问题中被告知要做的微妙变体:-)

// create an Action doing what you want
Action action = new AbstractAction("doSomething") {

    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println("triggered the action");
    }

};
// configure the Action with the accelerator (aka: short cut)
action.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control S"));

// create a button, configured with the Action
JButton toolBarButton = new JButton(action);
// manually register the accelerator in the button's component input map
toolBarButton.getActionMap().put("myAction", action);
toolBarButton.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(
        (KeyStroke) action.getValue(Action.ACCELERATOR_KEY), "myAction");

Answer 2

Sun对整个Key Binding问题有很好的描述.你可以在这里找到它:

关于键绑定的JavaSE教程

//编辑

编辑了我的示例代码,因此您只需复制+粘贴它就可以了.包括缺失的要点,感谢您的反馈.

KeyStroke keySave = KeyStroke.getKeyStroke(KeyEvent.VK_S, Event.CTRL_MASK); 
Action performSave = new AbstractAction("Save") {  
    public void actionPerformed(ActionEvent e) {     
         //do your save
         System.out.println("save");
    }
}; 
JButton b1 = new JButton(performSave); 
b1.getActionMap().put("performSave", performSave);
b1.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(keySave, "performSave"); 

KeyStroke keyExit = KeyStroke.getKeyStroke(KeyEvent.VK_Y, Event.CTRL_MASK); 
Action performExit = new AbstractAction("Exit") {  
    public void actionPerformed(ActionEvent e) {     
        //exit
        System.out.println("exit");
    }
}; 
JButton b2 = new JButton(performExit); 
b2.getActionMap().put("performExit", performExit);
b2.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(keyExit, "performExit");