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.JMenuItem; import javax.swing.JPopupMenu; import javax.swing.JTextField; import javax.swing.KeyStroke; import javax.swing.text.Document; //实现JTextfield 的复制、剪切、粘贴功能。 public class MJTextField extends JTextField implements MouseListener { private JPopupMenu pop = null; // 弹出菜单 private JMenuItem copy = null, paste = null, cut = null; // 三个功能菜单 public MJTextField() { super(); init(); } public MJTextField(int columns){ super(columns); init(); } public MJTextField(String text){ super(text); init(); } public MJTextField(String text, int columns){ super(text, columns); init(); } public MJTextField(Document doc, String text, int columns){ super(doc, text, columns); 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); } 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 pastable() { 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 copyable() { 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(copyable()); paste.setEnabled(pastable()); cut.setEnabled(copyable()); pop.show(this, e.getX(), e.getY()); } } public void mouseReleased(MouseEvent e) { } }
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.JMenuItem; import javax.swing.JPopupMenu; import javax.swing.JTextArea; import javax.swing.KeyStroke; import javax.swing.text.Document; //实现JTextArea 的复制、剪切、粘贴功能。 public class MJTextArea extends JTextArea implements MouseListener { private JPopupMenu pop = null; // 弹出菜单 private JMenuItem copy = null, paste = null, cut = null; // 三个功能菜单 public MJTextArea() { super(); init(); } public MJTextArea(Document doc) { super(doc); init(); } public MJTextArea(int rows, int columns){ super(rows, columns); init(); } public MJTextArea(String text){ super(text); init(); } public MJTextArea(String text, int rows, int columns){ super(text, rows, columns); init(); } public MJTextArea(Document doc, String text, int rows, int columns){ super(doc, text, rows, columns); 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); } 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 pastable() { 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 copyable() { 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(copyable()); paste.setEnabled(pastable()); cut.setEnabled(copyable()); pop.show(this, e.getX(), e.getY()); } } public void mouseReleased(MouseEvent e) { } }