Question

我正在使用Netbeans开发将在Windows中使用的应用程序。我注意到我无法右键单击进行复制或粘贴。我怎样才能启用它？（我使用的是基本的Swing控件，如JText和JTextArea。）

Answer 1

Why right click is not working on java application?

我不会创建新的副本，剪切，粘贴，撤消和放大选择所有操作，因为那些已经存在于每个组件的ActionMap中。我只是这样做：

 Action copyAction = textField.getActionMap().get("copy");
 Action cutAction = textField.getActionMap().get("cut");
 Action pasteAction = textField.getActionMap().get("paste");
 Action undoAction = textField.getActionMap().get("undo");
 Action selectAllAction = textField.getActionMap().get("selectAll");


 popup.add (undoAction);
 popup.addSeparator();
 popup.add (cutAction);
 popup.add (copyAction);
 popup.add (pasteAction);
 popup.addSeparator();
 popup.add (selectAllAction);

 return popup;

这样您就不会重新创建已编写的更多代码。除此之外，我将遵循这个例子。

Answer 2

征求意见，

它是否与操作系统交互？我想从我的Java应用程序中复制一些内容并粘贴到记事本上。

为什么要打扰用户手动复制粘贴，为什么不将textarea的内容写入文本文件？

Answer 3

final int colx;
final int rowy;
final String val1;

colx = CFDTable.getSelectedColumn();
rowy = CFDTable.getSelectedRow();

val1 = (String) CFDTable.getValueAt(rowy, colx);
JPopupMenu jPopupMenu = new javax.swing.JPopupMenu();
jPopupMenu.setName("jPopupMenu");
CFDTable.setComponentPopupMenu(jPopupMenu);
JMenuItem jMenuItem = new javax.swing.JMenuItem();
jMenuItem.setText("Copy"); // NOI18N
jMenuItem.setName("jMenuItem"); // NOI18N
jPopupMenu.add(jMenuItem);

jMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
StringSelection entry = new StringSelection(val1);
Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
clipboard.setContents(entry, entry);
}
});

Answer 4

静态类，可以立即将常规弹出菜单添加到文本字段中。

只需调用JTextFieldRegularPopupMenu.addTo（jTextFieldObj）;

import javax.swing.*;
import java.awt.event.ActionEvent;
import javax.swing.JPopupMenu;
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 {
                    JOptionPane.showMessageDialog(null,
                            "Undoable: " + undoManager.canUndo() ,
                            "Undo Status", 
                            JOptionPane.INFORMATION_MESSAGE);
                }
            }
        };

       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();
            }
        };

        popup.add (undoAction);
        popup.addSeparator();
        popup.add (cutAction);
        popup.add (copyAction);
        popup.add (pasteAction);
        popup.addSeparator();
        popup.add (selectAllAction);

       txtField.setComponentPopupMenu(popup);
    }
}

Answer 5

任何JTextComponent的完整工作模型，包括非功能性操作以及在文本选择状态下启用/禁用菜单项。

c:\xyz\desktop\practice

右键单击以复制并粘贴Java

5 个答案: