JavaJTextAreaKeyListener
当我按下ENTER键时,我的JTextArea开始一个新行,我只想对doClick()方法执行其他操作。 我该怎么做JavaJTextAreaKeyListener,java,swing,listener,jlabel,keylistener,Java,Swing,Listener,Jlabel,Keylistener,当我按下ENTER键时,我的JTextArea开始一个新行,我只想对doClick()方法执行其他操作。 我该怎么做 textarea.addKeyListener(new KeyListener(){ @Override public void keyPressed(KeyEvent e){ if(e.getKeyCode() == KeyEvent.VK_ENTER){ button.doClick(); } }
textarea.addKeyListener(new KeyListener(){
@Override
public void keyPressed(KeyEvent e){
if(e.getKeyCode() == KeyEvent.VK_ENTER){
button.doClick();
}
}
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
}
});
使用.consume()
:
使用此事件,以便在默认情况下不会对其进行处理
来源的方式
您应该与任何有疑问的JTextComponent
一起使用<从Swing
的角度来看,code>keylisters的级别太低了。您正在使用与AWT
相关的概念,Swing
使用KeyBindings
以更高的效率完成相同的任务,并提供所需的结果:-)
一个供您帮助的小程序:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class KeyBindingExample {
private static final String key = "ENTER";
private KeyStroke keyStroke;
private JButton button;
private JTextArea textArea;
private Action wrapper = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent ae) {
button.doClick();
}
};
private void displayGUI() {
JFrame frame = new JFrame("Key Binding Example");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
JPanel contentPane = new JPanel(new BorderLayout(5, 5));
textArea = new JTextArea(10, 10);
keyStroke = KeyStroke.getKeyStroke(key);
Object actionKey = textArea.getInputMap(
JComponent.WHEN_FOCUSED).get(keyStroke);
textArea.getActionMap().put(actionKey, wrapper);
button = new JButton("Click Me!");
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
System.out.format("Button Clicked :-)%n");
}
});
contentPane.add(textArea, BorderLayout.CENTER);
contentPane.add(button, BorderLayout.PAGE_END);
frame.setContentPane(contentPane);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
new KeyBindingExample().displayGUI();
}
};
EventQueue.invokeLater(r);
}
}
@佩特萨克斯太棒了!很高兴我能帮上忙。不要使用关键侦听器。Swing设计用于键绑定。完全不要使用KeyListener(不知道代码如何工作:您有可聚焦的标签?多么奇怪,用户多么困惑…)-使用键绑定
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class KeyBindingExample {
private static final String key = "ENTER";
private KeyStroke keyStroke;
private JButton button;
private JTextArea textArea;
private Action wrapper = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent ae) {
button.doClick();
}
};
private void displayGUI() {
JFrame frame = new JFrame("Key Binding Example");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
JPanel contentPane = new JPanel(new BorderLayout(5, 5));
textArea = new JTextArea(10, 10);
keyStroke = KeyStroke.getKeyStroke(key);
Object actionKey = textArea.getInputMap(
JComponent.WHEN_FOCUSED).get(keyStroke);
textArea.getActionMap().put(actionKey, wrapper);
button = new JButton("Click Me!");
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
System.out.format("Button Clicked :-)%n");
}
});
contentPane.add(textArea, BorderLayout.CENTER);
contentPane.add(button, BorderLayout.PAGE_END);
frame.setContentPane(contentPane);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
new KeyBindingExample().displayGUI();
}
};
EventQueue.invokeLater(r);
}
}