java - 协调两个 `ButtonGroup`

Question

我在菜单中有一组 3 个 JRadioButtonMenuItem，在工具栏中有 3 个 JToggleButton。它们中的每一个都绑定(bind)到 3 个 Action，因此当我禁用一个操作时，相应的项目和按钮都将被禁用。

当我点击一个菜单项时，我希望相应的工具栏按钮也被选中，但似乎“未点击”组对这些事件有其自己奇怪的 react 方式(我没有采用一种模式尝试识别)。

这是菜单组代码(简化):

ButtonGroup menuGrp = new ButtonGroup();

JRadioButtonMenuItem itemA = new JRadioButtonMenuItem(actionA);
JRadioButtonMenuItem itemB = new JRadioButtonMenuItem(actionB);
JRadioButtonMenuItem itemC = new JRadioButtonMenuItem(actionC);

menuGrp.add(itemA);
menuGrp.add(itemB);
menuGrp.add(itemC);

itemA.setSelected(true);

这里是工具栏组代码:

ButtonGroup toolbarGrp = new ButtonGroup();

JToggleButton buttonA = new JToggleButton(actionA);
JToggleButton buttonB = new JToggleButton(actionB);
JToggleButton buttonC = new JToggleButton(actionC);

toolbarGrp.add(buttonA);
toolbarGrp.add(buttonB);
toolbarGrp.add(buttonB);

buttonA.setSelected(true);

Answer 1

我不知道你到底是怎么做到的，但这段代码对我有用:

import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.JToggleButton;


public class Button
{
    public static void main(String[] args){
        JFrame frame = new JFrame();
        JMenuBar bar = new JMenuBar();
        JMenu menu = new JMenu("Foo");

        ButtonGroup menuGrp = new ButtonGroup();
        JRadioButtonMenuItem itemA = new JRadioButtonMenuItem();
        JRadioButtonMenuItem itemB = new JRadioButtonMenuItem();
        JRadioButtonMenuItem itemC = new JRadioButtonMenuItem();
        menuGrp.add(itemA);
        menuGrp.add(itemB);
        menuGrp.add(itemC);
        menu.add(itemA);
        menu.add(itemB);
        menu.add(itemC);
        itemA.setSelected(true);

        bar.add(menu);
        frame.setJMenuBar(bar);

        JPanel content = new JPanel();

        ButtonGroup toolbarGrp = new ButtonGroup();
        JToggleButton buttonA = new JToggleButton();
        JToggleButton buttonB = new JToggleButton();
        JToggleButton buttonC = new JToggleButton();
        toolbarGrp.add(buttonA);
        toolbarGrp.add(buttonB);
        toolbarGrp.add(buttonC);
        buttonA.setSelected(true);

        content.add(buttonA);
        content.add(buttonB);
        content.add(buttonC);

        itemA.setAction(new MyAction(buttonA));
        itemB.setAction(new MyAction(buttonB));
        itemC.setAction(new MyAction(buttonC));
        buttonA.setAction(new MyAction(itemA));
        buttonB.setAction(new MyAction(itemB));
        buttonC.setAction(new MyAction(itemC));
        frame.setContentPane(content);
        frame.setSize(300, 300);
        frame.setVisible(true);
    }

    static class MyAction extends AbstractAction
    {
        AbstractButton button;

        public MyAction(AbstractButton button){
            this.button = button;
        }

        @Override public void actionPerformed(ActionEvent e){
            button.setSelected(true);
        }   


    }
}