Java,menuBar,JMenuitems Focus

时间:2012-11-20 00:22:58

标签: java swing

我已经使用Key Accelerators创建了JMenuItems,然后我将它们直接添加到菜单栏中而无需添加到JMenu中,因此它们看起来像JButtons,每个工作都很好,但我注意到JMenuItem永远不会得到焦点点击或按下键,这给我带来了一些问题,例如: 其中一个JMenuItems用于保存,我也有一个JTextField在失去焦点时进行一些验证,但是当按下Save时无效,焦点保留在JTextField上。

任何想法?!

1 个答案:

答案 0 :(得分:0)

我建议使用JToolBar并利用Action API

这是一个非常简短的示例,说明如何为工具栏(或任何)按钮实现加速器支持。

public class MenuTest {

    public static void main(String[] args) {
        new MenuTest();
    }

    public MenuTest() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JToolBar tb = new JToolBar();
                tb.add(new FastButton(new OpenAction()));

                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(tb, BorderLayout.NORTH);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class FastButton extends JButton {

        private FastButton(Action action) {
            super(action);
            setHideActionText(true);
        }

        @Override
        protected void configurePropertiesFromAction(Action a) {
            super.configurePropertiesFromAction(a);
            if (a != null) {
                KeyStroke ks = (KeyStroke) a.getValue(Action.ACCELERATOR_KEY);
                InputMap inputMap = getInputMap(WHEN_IN_FOCUSED_WINDOW);
                ActionMap actionMap = getActionMap();
                inputMap.put(ks, "Action.accelerator");
                actionMap.put("Action.accelerator", a);
            }
        }

    }

    public class OpenAction extends AbstractAction {

        public OpenAction() {
            putValue(NAME, "Open");
            putValue(ACCELERATOR_KEY, KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_DOWN_MASK));
            putValue(SMALL_ICON, new ImageIcon(getClass().getResource("/folder_document.png")));
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            System.out.println("Open");
        }

    }

}