Swing:将切换按钮与按钮组以及相应的菜单项链接在一起 [英] Swing: link toggle buttons together with a button group, along with corresponding menu items

问题描述

对于学校项目，我需要制作一个可以绘制线条、椭圆和矩形的简单绘画应用程序.

For a school project, I need to make a simple paint application that can draw lines, ovals, and rectangles.

分配指定我需要工具栏按钮和每种形状的菜单项.

The assignment specifies that I need toolbar buttons and menu items for each type of shape.

我想通过制作工具栏中的按钮 JToggleButtons 和菜单项 JRadioButtonMenuItems 来更进一步.此外，我希望这样当您选择工具栏按钮之一时，它会取消选择其他按钮，选择适当的菜单项，并取消选择其他菜单项.选择菜单项之一也是如此.

I would like to go a little above and beyond, by making the buttons JToggleButtons in the toolbar and the menu items JRadioButtonMenuItems. Furthermore, I want it so that when you select one of the toolbar buttons, it deselects the other ones, selects the appropriate menu item, and deselects the other menu items. Same for selecting one of the menu items.

我知道我可以将任何 AbstractButton 与 ButtonGroup 分组，但我不确定这是否是正确的方法，因为尽管它处理一个组"按钮很好，我不确定它是否可以处理两个并行组.

I know I can group any AbstractButton with a ButtonGroup, but I am not sure if this is the right way to go, because though it handles one "group" of buttons just fine, I am not sure it can handle two parallel groups.

在没有 ButtonGroup 的情况下执行此操作意味着在 6 个事件侦听器中的每一个中，我都必须手动取消选择其他按钮，并且每一对将调用相同的代码来设置形状类型.

Doing it without ButtonGroup would mean in each of the 6 event listeners I would have to manually deselect the other buttons, and each pair would call the same code to set the shape type.

我也可以制作两个ButtonGroup，一个用于菜单，一个用于工具栏，但是我还要复制形状类型设置代码.

I could also make two ButtonGroups, one for the menu, one for the toolbar, but then I also have to duplicate shape type setting code.

在任何一种情况下，我也会冒菜单设置按钮的风险，该按钮设置一个设置按钮的菜单项，无止境.

In either situation, I also run the risk of the menu setting a button which sets a menu item which sets a button, ad infintum.

解决这个问题的最佳方法是什么?

What is the best way to tackle this problem?

(能够使用 Netbeans GUI 设计器解决问题的加分项；只是更简单)

(Bonus points for being able to solve the problem with the Netbeans GUI designer; It's just easier)

推荐答案

Action 接口是如果您有两个或多个执行相同功能的组件"的有效方法，如 如何使用操作.特别是，Action 将允许您的按钮和菜单项使用相同的代码.

The Action interface is an effective approach "if you have two or more components that perform the same function," as discussed in How to Use Actions. In particular, an Action would allow your buttons and menu items to use the same code.

附录:下面的示例显示了 JMenu 和 JToolBar 如何共享相同的 Action 用于多个文件中的每一个.

Addendum: The example below shows how a JMenu and a JToolBar can share the same Action for each of several files.

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.io.File;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JToolBar;

/** @see http://stackoverflow.com/questions/4038605 */
public class FileMenu {

    public static void main(String[] args) {

        EventQueue.invokeLater(new Runnable() {

            public void run() {
                new FileMenu().create();
            }
        });
    }

    void create() {
        File userDir = new File(System.getProperty("user.dir"));
        File[] files = userDir.listFiles();

        JMenu menu = new JMenu("Recent Files");
        JToolBar toolBar = new JToolBar(JToolBar.VERTICAL);
        JLabel label = new JLabel(" ", JLabel.CENTER);
        for (File f : files) {
            if (f.isFile() && !f.isHidden()) {
                RecentFile rf = new RecentFile(f, label);
                menu.add(new JMenuItem(rf.getAction()));
                toolBar.add(rf.getAction());
            }
        }
        JMenuBar menuBar = new JMenuBar();
        menuBar.add(menu);

        JFrame f = new JFrame("FileMenu");
        f.setJMenuBar(menuBar);
        f.add(toolBar, BorderLayout.CENTER);
        f.add(label, BorderLayout.SOUTH);
        f.pack();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
}

class RecentFile extends AbstractAction {

    private final File file;
    private final JLabel label;

    public RecentFile(final File file, final JLabel label) {
        this.file = file;
        this.label = label;
        this.putValue(Action.NAME, file.getName());
        this.putValue(Action.SHORT_DESCRIPTION, file.getAbsolutePath());
    }

    public void actionPerformed(ActionEvent e) {
        label.setText(file.getName());

    }

    public Action getAction() {
        return this;
    }
}

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