Question

我正在尝试在Java Swing中实现一个GUI（我是Swing的新手）。我有一个父面板，可以容纳2个面板。左侧面板和右侧面板。左侧面板有一个JComboBox下拉菜单。右侧面板是一张7张牌的CardLayout。我想根据左侧面板中JComboBox的选择更改右侧面板中显示的卡片。所有3个面板都是单独的类：LeftPanel.java，RightPanel.java和ParentPanel.java。我很难找到一个放置动作监听器的地方。 LeftPanel无法看到RightPanel的CardLayout，并且ParentPanel也无法访问子RightPanel的CardLayout。我看到一些关于访问另一个JPanel的CardLayout的帖子，但到目前为止，这些方法都没有对我有用。我的设计有缺陷吗？或者有可能实现这一目标吗？

EDIT 感谢您的建议到目前为止。以下是我的MCVE。请注意，每个类都在自己的（.java）文件中。我这样做，而不是把所有东西都放在Frame类中，只是为了便于维护。我之前在一个班级中拥有所有内容并且工作正常但它成为一个包含2000多行代码和20多个面板的长文件。

//包含Main方法的类MainFrame：

包tempgui; 公共类MainFrame扩展了JFrame {

JFrame Frame1;

public static void main(String[] args){

    new MainFrame();
}

public MainFrame(){

    Frame1 = new JFrame();
    Frame1.setDefaultCloseOperation(EXIT_ON_CLOSE);

    Frame1.getContentPane().add(new ParentPanel(), BorderLayout.CENTER);        

    Frame1.setSize(800, 600);
    Frame1.setLocationRelativeTo(null);
    Frame1.pack();

    Frame1.setVisible(true);
}

}

// Class ParentPanel：公共类ParentPanel扩展了JPanel {

private JPanel ParentPanel;
private LeftPanel LP;
private RightPanel RP;

public ParentPanel(){

    ParentPanel = new JPanel();
    LP = new LeftPanel();
    RP = new RightPanel();

    ParentPanel.setLayout(new GridLayout(1,2));

    ParentPanel.add(LP);
    ParentPanel.add(RP);

    add(ParentPanel);
}

}

//类LeftPanel：公共类LeftPanel扩展了JPanel {

private JPanel LeftPanel;
private JComboBox J1;

public LeftPanel(){

    LeftPanel = new JPanel();

    String[] Arr = {"RP1","RP2"};

    J1 = new JComboBox(Arr);

    LeftPanel.add(J1);

    add(LeftPanel);
}

}

// Class RightPanel：公共类RightPanel扩展了JPanel {

private JPanel RightPanel;
private RP1Panel RP1;
private RP2Panel RP2;
private CardLayout C1;

public RightPanel(){

    RightPanel = new JPanel();
    RP1 = new RP1Panel();
    RP2 = new RP2Panel();

    C1 = new CardLayout();

    RightPanel.setLayout(C1);

    RightPanel.add(RP1, "RP1");
    RightPanel.add(RP2, "RP2");
    C1.show(RightPanel, "RP1");

    add(RightPanel);
}

}

//类RP1Panel：公共类RP1Panel扩展了JPanel {

private JPanel RP1;
private JLabel JRP1;

public RP1Panel(){

    RP1 = new JPanel();
    JRP1 = new JLabel("RP1 Panel");
    RP1.add(JRP1);
    add(RP1);
}

}

//类RP2Panel：公共类RP2Panel扩展了JPanel {

private JPanel RP2;
private JLabel JRP2;

public RP2Panel(){

    RP2 = new JPanel();
    JRP2 = new JLabel("RP2 Panel");
    RP2.add(JRP2);
    add(RP2);
}

}

Answer 1

我会尝试给我的类方法允许其他类从中提取“ state ”信息，例如组合框的状态，并允许其他类改变它们，例如允许将侦听器添加到组合框中。例如：

// Class RightPanel:
class RightPanel extends JPanel {
    private JPanel rightPanel;
    private RP1Panel rightPanel1;
    private RP2Panel rightPanel2;
    private CardLayout cardLayout;

    public RightPanel() {
        rightPanel = new JPanel();
        rightPanel1 = new RP1Panel();
        rightPanel2 = new RP2Panel();
        cardLayout = new CardLayout();
        rightPanel.setLayout(cardLayout);
        rightPanel.add(rightPanel1, RP1Panel.NAME); //!!
        rightPanel.add(rightPanel2, RP2Panel.NAME);  // !!
        cardLayout.show(rightPanel, RP1Panel.NAME); // !!
        add(rightPanel);
    }

    // !! 
    public void showCard(String name) {
        cardLayout.show(rightPanel, name);
    }
}

然后其他类可以侦听组合框的更改，并在需要时提取选择。右侧面板同样具有允许更改其显示的“卡片”JPanel的方法。类似的东西：

// Class ParentPanel:
class ParentPanel extends JPanel {
    private JPanel ParentPanel;
    private LeftPanel leftPanel;
    private RightPanel rightPanel;

    public ParentPanel() {
        ParentPanel = new JPanel();
        leftPanel = new LeftPanel(new String[] {RP1Panel.NAME, RP2Panel.NAME});
        rightPanel = new RightPanel();
        ParentPanel.setLayout(new GridLayout(1, 2));
        ParentPanel.add(leftPanel);
        ParentPanel.add(rightPanel);
        add(ParentPanel);

        // !!
        leftPanel.comboAddActionListener(e -> {
            String selection = leftPanel.getComboSelection();
            rightPanel.showCard(selection);
        });
    }
}

他们可以在主要人物中捆绑在一起：

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.GridLayout;
import java.awt.event.ActionListener;

import javax.swing.*;

public class FooGui {
    public static void main(String[] args) {
        new MainFrame();
    }
}

class MainFrame extends JFrame {
    JFrame Frame1;

    public MainFrame() {
        Frame1 = new JFrame();
        Frame1.setDefaultCloseOperation(EXIT_ON_CLOSE);
        Frame1.getContentPane().add(new ParentPanel(), BorderLayout.CENTER);
        Frame1.setSize(800, 600);
        Frame1.setLocationRelativeTo(null);
        Frame1.pack();
        Frame1.setVisible(true);
    }
}

// Class ParentPanel:
class ParentPanel extends JPanel {
    private JPanel ParentPanel;
    private LeftPanel leftPanel;
    private RightPanel rightPanel;

    public ParentPanel() {
        ParentPanel = new JPanel();
        leftPanel = new LeftPanel(new String[] {RP1Panel.NAME, RP2Panel.NAME});
        rightPanel = new RightPanel();
        ParentPanel.setLayout(new GridLayout(1, 2));
        ParentPanel.add(leftPanel);
        ParentPanel.add(rightPanel);
        add(ParentPanel);

        // !!
        leftPanel.comboAddActionListener(e -> {
            String selection = leftPanel.getComboSelection();
            rightPanel.showCard(selection);
        });
    }
}

// Class LeftPanel:
class LeftPanel extends JPanel {
    private JPanel leftPanel;
    private JComboBox<String> comboBox; //!!

    // !!
    public LeftPanel(String[] comboTexts) {
        leftPanel = new JPanel();
        comboBox = new JComboBox<>(comboTexts); // !!
        leftPanel.add(comboBox);
        add(leftPanel);
    }

    // !!
    public String getComboSelection() {
        return comboBox.getSelectedItem().toString();
    }

    // !!
    public void comboAddActionListener(ActionListener listener) {
        comboBox.addActionListener(listener);
    }
}

// Class RightPanel:
class RightPanel extends JPanel {
    private JPanel rightPanel;
    private RP1Panel rightPanel1;
    private RP2Panel rightPanel2;
    private CardLayout cardLayout;

    public RightPanel() {
        rightPanel = new JPanel();
        rightPanel1 = new RP1Panel();
        rightPanel2 = new RP2Panel();
        cardLayout = new CardLayout();
        rightPanel.setLayout(cardLayout);
        rightPanel.add(rightPanel1, RP1Panel.NAME); //!!
        rightPanel.add(rightPanel2, RP2Panel.NAME);  // !!
        cardLayout.show(rightPanel, RP1Panel.NAME); // !!
        add(rightPanel);
    }

    // !! 
    public void showCard(String name) {
        cardLayout.show(rightPanel, name);
    }
}

// Class RP1Panel:
class RP1Panel extends JPanel {
    // !!
    public static final String NAME = "right panel 1";
    private JPanel RP1;
    private JLabel JRP1;

    public RP1Panel() {
        setName(NAME);
        RP1 = new JPanel();
        JRP1 = new JLabel("RP1 Panel");
        RP1.add(JRP1);
        add(RP1);
    }
}

// Class RP2Panel:
class RP2Panel extends JPanel {
    // !!
    public static final String NAME = "right panel 2";
    private JPanel RP2;
    private JLabel JRP2;

    public RP2Panel() {
        setName(NAME);
        RP2 = new JPanel();
        JRP2 = new JLabel("RP2 Panel");
        RP2.add(JRP2);
        add(RP2);
    }
}

整个MCVE看起来像：

    var alldb = (from r in MasterDataFactory.Container.ComponentRegistry.Registrations
                let s = r.Services.Where(i => i is KeyedService).Select(i => i as KeyedService).FirstOrDefault()
                where s!=null && s.ServiceType==typeof(ISomeInterface)
                select s).ToList();

如何从另一个子JPanel（Java Swing）中的输入触发一个子JPanel中的操作？

1 个答案: