java - 如何在 jpopupmenu 中捕获用户对 jradiobutton 的选择？

Question

我已经能够在我的框架和菜单项中显示一个弹出菜单，一组单选按钮可以使用箭头键导航。当用户按下 Enter/Return 时，弹出菜单不再可见，我假设可以确定选择了哪个按钮并分配操作。

    private static final JPopupMenu popupSyncTIR = new JPopupMenu();
    popupSyncTIR.setLabel("Sensor Synced to Clock");
    ButtonGroup grpTIR = new ButtonGroup();
    JRadioButtonMenuItem rbTIRMenuItem;
    rbTIRMenuItem = new JRadioButtonMenuItem("Sync TIR-A to clock");
    rbTIRMenuItem.setFont(new Font("Dialog", Font.BOLD, 16));
    grpTIR.add(rbTIRMenuItem);
    popupSyncTIR.add(rbTIRMenuItem);
    rbTIRMenuItem = new JRadioButtonMenuItem("Sync TIR-B to clock");
    rbTIRMenuItem.setFont(new Font("Dialog", Font.BOLD, 16));
    rbTIRMenuItem.setSelected(true);
    grpTIR.add(rbTIRMenuItem);
    popupSyncTIR.add(rbTIRMenuItem);
    rbTIRMenuItem = new JRadioButtonMenuItem("Sync TIR-C to clock");
    rbTIRMenuItem.setFont(new Font("Dialog", Font.BOLD, 16));
    grpTIR.add(rbTIRMenuItem);
    popupSyncTIR.add(rbTIRMenuItem);

我还像这样为整个框架实现了键映射:

/**
 * alt-T period synch TIR sensor w/clock
 */
@SuppressWarnings("serial")
private static void registerSyncTIRAction() {
    javax.swing.Action tirSync = new AbstractAction() {
        @Override
        public void actionPerformed(ActionEvent ae) {
            setTIRSensorSync();
        }
    };
    KeyStroke keyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_T,
            java.awt.event.InputEvent.ALT_DOWN_MASK);
    ((JComponent) contentPanel).getActionMap().put("TirSync", tirSync);
    ((JComponent) contentPanel).getInputMap(
            JComponent.WHEN_IN_FOCUSED_WINDOW).put(keyStroke, "TirSync");

}

/** 
 * Show the TIR popup
 */
private static void setTIRSensorSync() {
    popupSyncTIR.show(pnlTIR, 10, 10); 
}

如何确定在用户按下 Enter 之前选择了哪个单选按钮？

Answer 1

就像您使用不在菜单中的单选按钮一样 :-) 使用操作:

Action actionA = new AbstractAction("Synch A to clock") {

    @Override
    public void actionPerformed(ActionEvent e) {
        // do stuff A
    }
};
JRadioButtonMenuItem buttonA = new JRadioButtonMenuItem(actionA);
Action actionB = new AbstractAction("Synch B to clock") {

    @Override
    public void actionPerformed(ActionEvent e) {
        // do stuff B
    }
};
JRadioButtonMenuItem buttonB = new JRadioButtonItem(actionB);
ButtonGroup ... // add buttons to group
JPopupMenu ... // add buttons to menu