如何在没有修饰符的情况下为JRadioButton设置快捷键
我正在一个项目中工作，我需要为每个JRadioButton添加一个键快捷键，同时查看另一个类似的问题，并且当我使用其他一些自定义Action我决定在每个JRadioButton上使用方法setAction ，但是它需要我按ALT + 1 – ALT + 5来“触发”我的CustomAction类的actionPerformed方法。
如何修改此类以便按1 – 5并获得相同的行为？
这是我制作的代码，用于演示此问题：
import java.awt.event.ActionEvent; import java.awt.event.KeyEvent; import javax.swing.AbstractAction; import javax.swing.BoxLayout; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JRadioButton; import javax.swing.KeyStroke; import javax.swing.SwingUtilities; public class RadioButtonSelectableByNumbers { private JFrame frame; private JRadioButton buttons[]; private ButtonGroup group; public RadioButtonSelectableByNumbers() { } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { new RadioButtonSelectableByNumbers().createAndShowGui(); } }); } public void createAndShowGui() { frame = new JFrame("frame"); buttons = new JRadioButton[5]; group = new ButtonGroup(); frame.getContentPane().setLayout(new BoxLayout(frame.getContentPane(), BoxLayout.PAGE_AXIS)); for (int i = 0; i < buttons.length; i++) { buttons[i] = new JRadioButton(); switch (i) { case 0: buttons[i].setAction(new CustomAction(String.valueOf(i + 1), KeyEvent.VK_1)); break; case 1: buttons[i].setAction(new CustomAction(String.valueOf(i + 1), KeyEvent.VK_2)); break; case 2: buttons[i].setAction(new CustomAction(String.valueOf(i + 1), KeyEvent.VK_3)); break; case 3: buttons[i].setAction(new CustomAction(String.valueOf(i + 1), KeyEvent.VK_4)); break; default: buttons[i].setAction(new CustomAction(String.valueOf(i + 1), KeyEvent.VK_5)); break; } group.add(buttons[i]); frame.getContentPane().add(buttons[i]); } frame.pack(); frame.setVisible(true); } class CustomAction extends AbstractAction { public CustomAction(String name, Integer mnemonic, Integer modifier) { super(name); putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(mnemonic, modifier)); } public CustomAction(String name, Integer mnemonic) { super(name); putValue(MNEMONIC_KEY, mnemonic); } @Override public void actionPerformed(ActionEvent e) { System.out.println("radio clicked"); } } }
如何将任何键绑定到Swing中的组件？ 键绑定： 键绑定教程 。
我看着你的代码时坚持下去……
例如
import java.awt.Component; import java.awt.event.ActionEvent; import java.awt.event.KeyEvent; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.ActionMap; import javax.swing.BoxLayout; import javax.swing.ButtonGroup; import javax.swing.InputMap; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JRadioButton; import javax.swing.KeyStroke; import javax.swing.SwingUtilities; public class RadioButtonSelectableByNumbers { private JFrame frame; private JRadioButton buttons[]; private ButtonGroup group; public RadioButtonSelectableByNumbers() { } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { new RadioButtonSelectableByNumbers().createAndShowGui(); } }); } public void createAndShowGui() { frame = new JFrame("frame"); frame.setDefaultCloseOperation(JFrame); buttons = new JRadioButton[5]; group = new ButtonGroup(); frame.getContentPane().setLayout(new BoxLayout(frame.getContentPane(), BoxLayout.PAGE_AXIS)); for (int i = 0; i < buttons.length; i++) { JRadioButton rbtn = createButton(i); buttons[i] = rbtn; frame.getContentPane().add(rbtn); } frame.pack(); frame.setVisible(true); } private JRadioButton createButton(int i) { String name = String.valueOf(i + 1); int stdMnemonic = KeyEvent.VK_1 + i; // for standard number keys int numpadMnemonic = KeyEvent.VK_NUMPAD1 + i; // for numpad number keys Action action = new CustomAction(name, stdMnemonic); JRadioButton rBtn = new JRadioButton(action); group.add(rBtn); // bindings active if window is focused. Component doesn't have to be focused int condition = JComponent.WHEN_IN_FOCUSED_WINDOW; InputMap inputMap = rBtn.getInputMap(condition); ActionMap actionMap = rBtn.getActionMap(); KeyStroke keyStroke = KeyStroke.getKeyStroke(stdMnemonic, 0); KeyStroke keyStroke2 = KeyStroke.getKeyStroke(numpadMnemonic, 0); inputMap.put(keyStroke, keyStroke.toString()); actionMap.put(keyStroke.toString(), action); inputMap.put(keyStroke2, keyStroke2.toString()); actionMap.put(keyStroke2.toString(), action); return rBtn; } class CustomAction extends AbstractAction { public CustomAction(String name, Integer mnemonic, Integer modifier) { super(name); putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(mnemonic, modifier)); } public CustomAction(String name, Integer mnemonic) { super(name); putValue(MNEMONIC_KEY, mnemonic); } @Override public void actionPerformed(ActionEvent e) { System.out.println("radio clicked: " + e.getActionCommand()); } } }
另一种解决方案，可能更好，因为通常JRadioButtons不使用ActionListeners，就是创建一个只需单击按钮的AbstractAction。 在下面的示例中，MyAction执行此操作，并为活动的JRadioButton提供焦点：
import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.awt.event.KeyEvent; import javax.swing.*; @SuppressWarnings("serial") public class NumberActions extends JPanel { private ButtonGroup buttonGroup = new ButtonGroup(); public NumberActions() { ItemListener itemListener = new MyItemListener(); setLayout(new GridLayout(1, 0)); for (int i = 0; i < 10; i++) { JRadioButton rBtn = createRadioBtn(i); rBtn.addItemListener(itemListener); buttonGroup.add(rBtn); add(rBtn); } } private JRadioButton createRadioBtn(int i) { String text = String.valueOf(i); JRadioButton rBtn = new JRadioButton(text); rBtn.setActionCommand(text); int condition = JComponent.WHEN_IN_FOCUSED_WINDOW; InputMap inputMap = rBtn.getInputMap(condition); ActionMap actionMap = rBtn.getActionMap(); Action action = new MyAction(rBtn); bindAction(inputMap, actionMap, action, KeyEvent.VK_0 + i); bindAction(inputMap, actionMap, action, KeyEvent.VK_NUMPAD0 + i); return rBtn; } private void bindAction(InputMap inputMap, ActionMap actionMap, Action action, int mnemonic) { KeyStroke keyStroke = KeyStroke.getKeyStroke(mnemonic, 0); inputMap.put(keyStroke, keyStroke.toString()); actionMap.put(keyStroke.toString(), action); } private class MyItemListener implements ItemListener { @Override public void itemStateChanged(ItemEvent iEvt) { if (iEvt.getStateChange() == ItemEvent.SELECTED) { AbstractButton btn = (AbstractButton) iEvt.getSource(); System.out.println("Button: " + btn.getActionCommand()); } } } private class MyAction extends AbstractAction { private AbstractButton btn; public MyAction(AbstractButton btn) { this.btn = btn; } @Override public void actionPerformed(ActionEvent e) { btn.requestFocusInWindow(); btn.doClick(); } } private static void createAndShowGui() { NumberActions mainPanel = new NumberActions(); JFrame frame = new JFrame("NumberActions"); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); frame.getContentPane().add(mainPanel); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(() -> createAndShowGui()); } }
编辑：代码已修复