小編典典

右鍵單擊效果很好-在Swing中，不要獲取您在其他應用中習慣的上下文菜單是很正常的。如果您希望有一個右鍵單擊打開的彈出菜單，例如具有剪切/復制/粘貼操作-

您必須自己實現。我在我的應用程序中使用了以下內容：

public class ContextMenuMouseListener extends MouseAdapter {

private JPopupMenu popup = new JPopupMenu();

private Action cutAction;

private Action copyAction;

private Action pasteAction;

private Action undoAction;

private Action selectAllAction;

private JTextComponent textComponent;

private String savedString = "";

private Actions lastActionSelected;

private enum Actions { UNDO, CUT, COPY, PASTE, SELECT_ALL };

public ContextMenuMouseListener() {

undoAction = new AbstractAction("Undo") {

@Override

public void actionPerformed(ActionEvent ae) {

textComponent.setText("");

textComponent.replaceSelection(savedString);

lastActionSelected = Actions.UNDO;

}

};

popup.add(undoAction);

popup.addSeparator();

cutAction = new AbstractAction("Cut") {

@Override

public void actionPerformed(ActionEvent ae) {

lastActionSelected = Actions.CUT;

savedString = textComponent.getText();

textComponent.cut();

}

};

popup.add(cutAction);

copyAction = new AbstractAction("Copy") {

@Override

public void actionPerformed(ActionEvent ae) {

lastActionSelected = Actions.COPY;

textComponent.copy();

}

};

popup.add(copyAction);

pasteAction = new AbstractAction("Paste") {

@Override

public void actionPerformed(ActionEvent ae) {

lastActionSelected = Actions.PASTE;

savedString = textComponent.getText();

textComponent.paste();

}

};

popup.add(pasteAction);

popup.addSeparator();

selectAllAction = new AbstractAction("Select All") {

@Override

public void actionPerformed(ActionEvent ae) {

lastActionSelected = Actions.SELECT_ALL;

textComponent.selectAll();

}

};

popup.add(selectAllAction);

}

@Override

public void mouseClicked(MouseEvent e) {

if (e.getModifiers() == InputEvent.BUTTON3_MASK) {

if (!(e.getSource() instanceof JTextComponent)) {

return;

}

textComponent = (JTextComponent) e.getSource();

textComponent.requestFocus();

boolean enabled = textComponent.isEnabled();

boolean editable = textComponent.isEditable();

boolean nonempty = !(textComponent.getText() == null || textComponent.getText().equals(""));

boolean marked = textComponent.getSelectedText() != null;

boolean pasteAvailable = Toolkit.getDefaultToolkit().getSystemClipboard().getContents(null).isDataFlavorSupported(DataFlavor.stringFlavor);

undoAction.setEnabled(enabled && editable && (lastActionSelected == Actions.CUT || lastActionSelected == Actions.PASTE));

cutAction.setEnabled(enabled && editable && marked);

copyAction.setEnabled(enabled && marked);

pasteAction.setEnabled(enabled && editable && pasteAvailable);

selectAllAction.setEnabled(enabled && nonempty);

int nx = e.getX();

if (nx > 500) {

nx = nx - popup.getSize().width;

}

popup.show(e.getComponent(), nx, e.getY() - popup.getSize().height);

}

}

}

最后，您應該將此偵聽器附加到要在右鍵單擊上具有上下文菜單的任何文本組件。

2020-11-13

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