我自动生成一组JMenuItem，并在每次右键单击事件中将它们添加到JPopUpMenu。问题是当我按下所选菜单上的回车键时，我为菜单项设置的操作不会运行。我可以使用向上/向下键在菜单上导航，但是，只能通过鼠标单击来执行操作。
以下是创建菜单项的代码：
private JMenuItem createMenuItem(TaskFactory tf, String title, boolean useCheckBoxMenuItem, String toolTipText) {
enter code hereJMenuItem item;
PopupAction action = new PopupAction(tf, title);
if ( useCheckBoxMenuItem )
item = new JCheckBoxMenuItem(action);
else
item = new JMenuItem(action);
item.setEnabled(tf.isReady());
item.setToolTipText(toolTipText);
return item;
}
private class PopupAction extends AbstractAction {
TaskFactory tf;
PopupAction(TaskFactory tf, String title) {
super( title );
this.tf = tf;
}
public void actionPerformed(ActionEvent ae) {
m_view.manager.execute(tf.createTaskIterator());
}
}
我尝试将焦点设置为true，但这不起作用。我在Mac 10.7上尝试过Java版本1.6.0_33和Ubuntu Java版本1.6.0_26。我使用了标准的摇摆外观和感觉。在Mac上运行时：外观和感觉是[适用于Mac OS X的Aqua Look and Feel - com.apple.laf.AquaLookAndFeel]
答案 0 :(得分：2)
Windows XP，JDK6_025，使用Substance，Metal，Windows，Nimbus
EDIT1
在enter按下的键或鼠标被触发isEnabled
Edit2
添加MenuKeyListener，
通知!!!!!
不要使用MenuKeyListener来抓取另一个KeyEvents tab（空格）和enter，否则会产生虚假结果，例如Unknown keyCode: 0x0 on …。
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.MenuKeyEvent;
import javax.swing.event.MenuKeyListener;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;
import javax.swing.table.*;
import org.pushingpixels.substance.api.SubstanceLookAndFeel;
import org.pushingpixels.substance.api.skin.BusinessBlueSteelSkin;
public class TableCheckBox extends JFrame {
private static final long serialVersionUID = 1L;
private JTable table;
public TableCheckBox() {
Object[] columnNames = {"Type", "Company", "Shares", "Price", "Boolean"};
Object[][] data = {
{"Buy", "IBM", new Integer(1000), new Double(80.50), false},
{"Sell", "MicroSoft", new Integer(2000), new Double(6.25), true},
{"Sell", "Apple", new Integer(3000), new Double(7.35), true},
{"Buy", "Nortel", new Integer(4000), new Double(20.00), false}
};
DefaultTableModel model = new DefaultTableModel(data, columnNames);
table = new JTable(model) {
private static final long serialVersionUID = 1L;
@Override
public Class getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
};
table.setPreferredScrollableViewportSize(table.getPreferredSize());
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
createPopupMenu();
}
private void createPopupMenu() {
MyMenuKeyListener myMenuKeyListener = new MyMenuKeyListener();
JPopupMenu popup = new JPopupMenu();
JMenuItem myMenuItem1 = new JMenuItem("cccccccccccccccccccccc");
myMenuItem1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//System.out.println("Done myMenuItem1");
}
});
myMenuItem1.getModel().addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
ButtonModel model = (ButtonModel) e.getSource();
if (model.isArmed()) {
//System.out.println("isArmed");
} else if (model.isEnabled()) {
//System.out.println("isEnabled");
} else if (model.isPressed()) {
//System.out.println("isPressed");
} else if (model.isRollover()) {
//System.out.println("isRollover");
} else if (model.isSelected()) {
//System.out.println("isSelected");
}
}
});
myMenuItem1.addMenuKeyListener(myMenuKeyListener);
JMenuItem myMenuItem2 = new JMenuItem("bbbbbbbbbbbbbbbbbbbbbb");
myMenuItem2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//System.out.println("Done myMenuItem2");
}
});
myMenuItem2.getModel().addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
ButtonModel model = (ButtonModel) e.getSource();
if (model.isArmed()) {
//System.out.println("isArmed");
} else if (model.isEnabled()) {
//System.out.println("isEnabled");
} else if (model.isPressed()) {
//System.out.println("isPressed");
} else if (model.isRollover()) {
//System.out.println("isRollover");
} else if (model.isSelected()) {
//System.out.println("isSelected");
}
}
});
myMenuItem2.addMenuKeyListener(myMenuKeyListener);
popup.add(myMenuItem1);
popup.add(myMenuItem2);
MouseListener popupListener = new PopupListener(popup);
table.addMouseListener(popupListener);
popup.setLightWeightPopupEnabled(false);
PopupMenuListener popupMenuListener = new MyPopupMenuListener();
popup.addPopupMenuListener(popupMenuListener);
}
private class PopupListener extends MouseAdapter {
private JPopupMenu popup;
PopupListener(JPopupMenu popupMenu) {
popup = popupMenu;
}
@Override
public void mousePressed(MouseEvent e) {
maybeShowPopup(e);
}
@Override
public void mouseReleased(MouseEvent e) {
if (table.getSelectedRow() != -1) {
maybeShowPopup(e);
}
}
private void maybeShowPopup(MouseEvent e) {
if (e.isPopupTrigger()) {
popup.show(e.getComponent(), e.getX(), e.getY());
}
}
}
private class MyMenuKeyListener implements MenuKeyListener {
public void menuKeyTyped(MenuKeyEvent e) {
MenuElement[] path = e.getPath();
JMenuItem item = (JMenuItem) path[path.length - 1];
System.out.println("Key typed: " + e.getKeyChar()
+ ", " + MenuKeyEvent.getKeyText(e.getKeyCode())
+ " on " + item.getText());
}
public void menuKeyPressed(MenuKeyEvent e) {
MenuElement[] path = e.getPath();
JMenuItem item = (JMenuItem) path[path.length - 1];
System.out.println("Key typed: " + e.getKeyChar()
+ ", " + MenuKeyEvent.getKeyText(e.getKeyCode())
+ " on " + item.getText());
}
public void menuKeyReleased(MenuKeyEvent e) {
MenuElement[] path = e.getPath();
JMenuItem item = (JMenuItem) path[path.length - 1];
System.out.println("Key typed: " + e.getKeyChar()
+ ", " + MenuKeyEvent.getKeyText(e.getKeyCode())
+ " on " + item.getText());
}
}
private class MyPopupMenuListener implements PopupMenuListener {
public void popupMenuCanceled(PopupMenuEvent popupMenuEvent) {
//System.out.println("Canceled");
}
public void popupMenuWillBecomeInvisible(PopupMenuEvent popupMenuEvent) {
//System.out.println("Becoming Invisible");
}
public void popupMenuWillBecomeVisible(PopupMenuEvent popupMenuEvent) {
//System.out.println("Becoming Visible");
}
}
public static void main(String[] args) {
/*SwingUtilities.invokeLater(new Runnable() {
public void run() {
SubstanceLookAndFeel.setSkin(new BusinessBlueSteelSkin());
}
});*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
/*UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());*/
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
}
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
TableCheckBox frame = new TableCheckBox();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setLocation(150, 150);
frame.setVisible(true);
}
});
}
}
答案 1 :(得分：1)
AFAIK，这就是外观的感觉。按空格键可以单击按钮和菜单项。 Enter表示单击默认按钮。
答案 2 :(得分：1)
对于添加到菜单栏的所有项目以及通过Action添加到上下文菜单中的项目，此ImageApp似乎可以正常使用setComponentPopupMenu()。 Enter 或 Space 从菜单栏或上下文菜单中唤起所选菜单项。
另外，请注意使用getMenuShortcutKeyMask()作为跨平台MASK。
答案 3 :(得分：0)
您需要将KeyListener添加到JMenuItem，并将该项设置为focusable。让您的JMenuItem请求焦点
JMenuItem.requestFocus();
当它具有焦点时，实现很容易
在你的keylistener中：
@Override
public void keyReleased(KeyEvent e) {
if (e.getKeyCode() == e.VK_ENTER) {
// do stuff
}
}