Java右键菜单实现文本组件内容的的复制、粘贴、剪切功能 -11-19 18:12:14
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
/**
* Java右键菜单实现文本组件内容的的复制、粘贴、剪切功能
*
* @author
* @blog /zhm
*/
public class Right extends JFrame {
private static final long serialVersionUID = -594208799101297L;
private JScrollPane pane = null;
private TextAreaMenu text = null;
public Right()
{
super("右键菜单");
try { // 使用Windows的界面风格
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
}
catch (Exception e) {
e.printStackTrace();
}
text = new TextAreaMenu();
pane = new JScrollPane(text);
this.getContentPane().add(pane);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(300, 200);
this.setVisible(true);
}//right end
public static void main(String args[])
{ new Right(); }
/**
* 带有功能菜单的JTextArea
* @author
* @blog /zhm
*/
class TextAreaMenu extends JTextArea implements MouseListener
{
private static final long serialVersionUID = -2308615404205560110L;
private JPopupMenu pop = null; // 弹出菜单
private JMenuItem copy = null, paste = null, cut = null; // 三个功能菜单
public TextAreaMenu()
{
super();
init();
}
private void init()
{
this.addMouseListener(this);
pop = new JPopupMenu();
pop.add(copy = new JMenuItem("复制"));
pop.add(paste = new JMenuItem("粘贴"));
pop.add(cut = new JMenuItem("剪切"));
copy.setAccelerator(KeyStroke.getKeyStroke("C", InputEvent.CTRL_MASK));
paste.setAccelerator(KeyStroke.getKeyStroke("V", InputEvent.CTRL_MASK));
cut.setAccelerator(KeyStroke.getKeyStroke("X", InputEvent.CTRL_MASK));
copy.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
action(e);
}
});
paste.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) { action(e); }
});
cut.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) { action(e);}
} );
this.add(pop);
}
/**
* 菜单动作
* @param e
*/
public void action(ActionEvent e) {
String str = e.getActionCommand();
if (str.equals(copy.getText())) { // 复制
this.copy();
} else if (str.equals(paste.getText())) { // 粘贴
this.paste();}
else if (str.equals(cut.getText())) { // 剪切
this.cut(); }
}
public JPopupMenu getPop() {
return pop; }
public void setPop(JPopupMenu pop) {
this.pop = pop; }
/**
* 剪切板中是否有文本数据可供粘贴
*
* @return true为有文本数据
*/
public boolean isClipboardString() {
boolean b = false;
Clipboard clipboard = this.getToolkit().getSystemClipboard();
Transferable content = clipboard.getContents(this);
try {
if (content.getTransferData(DataFlavor.stringFlavor) instanceof String) {
b = true;
}
} catch (Exception e) {
}
return b;
}
/**
* 文本组件中是否具备复制的条件
* @return true为具备
*/
public boolean isCanCopy() {
boolean b = false;
int start = this.getSelectionStart();
int end = this.getSelectionEnd();
if (start != end)
b = true;
return b;
}
public void mouseClicked(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mousePressed(MouseEvent e)
{
if (e.getButton() == MouseEvent.BUTTON3)
{
copy.setEnabled(isCanCopy());
paste.setEnabled(isClipboardString());
cut.setEnabled(isCanCopy());
pop.show(this, e.getX(), e.getY());
}
}
public void mouseReleased(MouseEvent e) {
}
}
}
