Java：右键单击文本字段上的复制剪切粘贴
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Java: Right Click Copy Cut Paste On TextField
提问by Ven Nilson
I've made a program which prints a value in a text field. The problem is that when a user right clicks in the text field, a menu like this won't open:
我制作了一个在文本字段中打印值的程序。问题是当用户在文本字段中右键单击时，不会打开这样的菜单：
Is there a way the user can have this menu open upon right click?
用户是否可以通过右键单击打开此菜单？
This is my code:
这是我的代码：
public class A extends JFrame{
private JTextField txt1;
private JTextField txt2;
private JLabel val;
private JLabel prt;
private JButton bt1;
public A() {
getContentPane().setLayout(null);
txt1 = new JTextField();
txt1.setBounds(178, 93, 87, 28);
getContentPane().add(txt1);
txt2 = new JTextField();
txt2.setBounds(178, 148, 87, 28);
getContentPane().add(txt2);
val = new JLabel("Enter Value");
val.setBounds(84, 93, 69, 28);
getContentPane().add(val);
prt = new JLabel("Printed Value");
prt.setBounds(80, 148, 87, 28);
getContentPane().add(prt);
bt1 = new JButton("Click This");
bt1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
int n=Integer.parseInt(txt1.getText());
txt2.setText(n+"");
}
});
bt1.setBounds(178, 188, 105, 28);
getContentPane().add(bt1);
setSize(400, 399);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
}
Main Method:
主要方法：
public class Main {
public static void main(String[] args) {
A object = new A();
}
}
回答by camickr
Read the Swing tutorial on How to Use Menusfor the basics of creating a popup menu.
阅读有关如何使用菜单的 Swing 教程，了解创建弹出菜单的基础知识。
Then you can use the Actionsprovided by the DefaultEditorKitto create your popup menu.
然后您可以使用Actions提供的DefaultEditorKit来创建您的弹出菜单。
For the "Delete" action you will need to create your own custom Action. Read the Swing tutorial on How to Use Actionsfor the basics. Except you would extend TextActionsince it has methods that allow you to access the text component with focus so you can create reusable code.
对于“删除”操作，您需要创建自己的自定义操作。阅读有关如何使用操作的 Swing 教程以了解基础知识。除非您会扩展，TextAction因为它具有允许您使用焦点访问文本组件的方法，因此您可以创建可重用的代码。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
public class TextFieldPopup extends JPanel
{
public TextFieldPopup()
{
JTextField textField = new JTextField(10);
add( textField );
JPopupMenu menu = new JPopupMenu();
Action cut = new DefaultEditorKit.CutAction();
cut.putValue(Action.NAME, "Cut");
cut.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control X"));
menu.add( cut );
Action copy = new DefaultEditorKit.CopyAction();
copy.putValue(Action.NAME, "Copy");
copy.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control C"));
menu.add( copy );
Action paste = new DefaultEditorKit.PasteAction();
paste.putValue(Action.NAME, "Paste");
paste.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control V"));
menu.add( paste );
Action selectAll = new SelectAll();
menu.add( selectAll );
textField.setComponentPopupMenu( menu );
}
static class SelectAll extends TextAction
{
public SelectAll()
{
super("Select All");
putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control S"));
}
public void actionPerformed(ActionEvent e)
{
JTextComponent component = getFocusedComponent();
component.selectAll();
component.requestFocusInWindow();
}
}
private static void createAndShowGUI()
{
JFrame frame = new JFrame("TextFieldPopup");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add( new TextFieldPopup() );
frame.setLocationByPlatform( true );
frame.pack();
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
}
回答by Karlo Kokkak
Static class to instantly add regular popup menu to a textfield.
静态类可立即将常规弹出菜单添加到文本字段。
import javax.swing.*;
import java.awt.event.ActionEvent;
import javax.swing.undo.*;
public class JTextFieldRegularPopupMenu {
public static void addTo(JTextField txtField)
{
JPopupMenu popup = new JPopupMenu();
UndoManager undoManager = new UndoManager();
txtField.getDocument().addUndoableEditListener(undoManager);
Action undoAction = new AbstractAction("Undo") {
@Override
public void actionPerformed(ActionEvent ae) {
if (undoManager.canUndo()) {
undoManager.undo();
}
else {
System.out.println("No Undo Buffer.");
}
}
};
Action copyAction = new AbstractAction("Copy") {
@Override
public void actionPerformed(ActionEvent ae) {
txtField.copy();
}
};
Action cutAction = new AbstractAction("Cut") {
@Override
public void actionPerformed(ActionEvent ae) {
txtField.cut();
}
};
Action pasteAction = new AbstractAction("Paste") {
@Override
public void actionPerformed(ActionEvent ae) {
txtField.paste();
}
};
Action selectAllAction = new AbstractAction("Select All") {
@Override
public void actionPerformed(ActionEvent ae) {
txtField.selectAll();
}
};
cutAction.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control X"));
copyAction.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control C"));
pasteAction.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control V"));
selectAllAction.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control A"));
popup.add (undoAction);
popup.addSeparator();
popup.add (cutAction);
popup.add (copyAction);
popup.add (pasteAction);
popup.addSeparator();
popup.add (selectAllAction);
txtField.setComponentPopupMenu(popup);
}
}
Usage:
用法：
JTextFieldRegularPopupMenu.addTo(jTxtMsg);
Instantly adds popup menu to the chosen JTextFIeld.
立即将弹出菜单添加到选定的 JTextFIeld。
回答by MadProgrammer
I'd start with How to use menusand Bringing Up a Popup Menu(although I'd personally use JComponent#setComponentPopupMenuinstead of a MouseListener)
我将从如何使用菜单和调出弹出菜单开始（尽管我个人会使用JComponent#setComponentPopupMenu而不是MouseListener）
Then I'd have a look at JTextField#copy, JTextField#cutand JTextField#paste
