如何在java中为jbutton添加快捷键? [英] How to add a shortcut key for a jbutton in java?
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问题描述
我有一个 jButton,我想为其分配一个快捷方式.就像我在键盘上按下删除键一样,它只点击了一次 jButton.我该怎么做?
I have a jButton i want to assign a shortcut on it. Like when I press delete on keyboard it just clicks that jButton once. How can I do that?
推荐答案
您需要创建一个 Action
供按钮使用.然后 Action
可以被 ActionListener
使用,你可以将 Action
绑定到 KeyStroke
.
You need to create an Action
to be used by the button. Then the Action
can be used by the ActionListener
and you can bind the Action
to a KeyStroke
.
阅读 Swing 教程.有以下部分:
- 如何使用操作
- 如何使用键绑定
例如:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class CalculatorPanel extends JPanel
{
private JTextField display;
public CalculatorPanel()
{
Action numberAction = new AbstractAction()
{
@Override
public void actionPerformed(ActionEvent e)
{
// display.setCaretPosition( display.getDocument().getLength() );
display.replaceSelection(e.getActionCommand());
}
};
setLayout( new BorderLayout() );
display = new JTextField();
display.setEditable( false );
display.setHorizontalAlignment(JTextField.RIGHT);
add(display, BorderLayout.NORTH);
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout( new GridLayout(0, 5) );
add(buttonPanel, BorderLayout.CENTER);
for (int i = 0; i < 10; i++)
{
String text = String.valueOf(i);
JButton button = new JButton( text );
button.addActionListener( numberAction );
button.setBorder( new LineBorder(Color.BLACK) );
button.setPreferredSize( new Dimension(30, 30) );
buttonPanel.add( button );
InputMap inputMap = buttonPanel.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
inputMap.put(KeyStroke.getKeyStroke(text), text);
inputMap.put(KeyStroke.getKeyStroke("NUMPAD" + text), text);
buttonPanel.getActionMap().put(text, numberAction);
}
}
private static void createAndShowUI()
{
JFrame frame = new JFrame("Calculator Panel");
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.add( new CalculatorPanel() );
frame.pack();
frame.setLocationRelativeTo( null );
frame.setVisible(true);
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowUI();
}
});
}
}
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