java - 将多个 JPanel 放入 JTabbedpane 中

Question

我查看了一段时间，还试过向 JTabbedPane 添加多个面板。

我的问题是:是否可以将同一个 Jpanel 添加到多个 TabbedPanes。我尝试过的所有方法，似乎都无法正常工作。这就是它的工作原理。

public MainGUI() {

  JMenuBar menuBar = new JMenuBar();
  setJMenuBar(menuBar);

  JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
  getContentPane().add(tabbedPane, BorderLayout.CENTER);

  JEditorPane instructionalEditorPane = new JEditorPane();
  tabbedPane.addTab("Instructional", instructionalEditorPane);

  JPanel codePanel = new JPanel();
  JPanel drawPanel = new JPanel();

  JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, codePanel, drawPanel);
  splitPane.setResizeWeight(0.75);

  tabbedPane.addTab("Code Panel", splitPane);

  JEditorPane unifiedInstPane = new JEditorPane();
  JPanel unifiedCodePanel = new JPanel();
  JPanel unifiedDrawPanel = new JPanel();
  JSplitPane unifiedSplitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, unifiedCodePanel, unifiedDrawPanel);
  unifiedSplitPane.setResizeWeight(0.75);

  JSplitPane unifiedPanel = new JSplitPane(JSplitPane.VERTICAL_SPLIT,unifiedInstPane, unifiedSplitPane);
  unifiedPanel.setResizeWeight(0.40);
  tabbedPane.addTab("Unified Tab", unifiedPanel);
}

我想做的只是将 instructionalEditorPane 和 splitPane 添加到多个 tabbedPanes，但是当我这样做时，我松开了原来的 Individual tabbedPanes。如果必须的话，我可以这样做，但我必须同时写信给 unifiedInstPane 和 instructionalEditorPane 以保持它们更新。我还必须为嵌入了 codePanel 和 drawPanel 的 2 个 splitPanes 执行此操作。这将使所有面板保持同步变得更加困难。

有什么建议吗？

Answer 1

“是否可以将同一个 Jpanel 添加到多个 TabbedPanes。” - 否。您一次只能将一个组件添加到一个容器中。您的 JPanel 应该共享模型 但使用独特的组件。该模型可能是您创建的非 GUI 类。

例如，这是我的建议的非常简单化的呈现:

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;

import javax.swing.*;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;

public class MainGui2 extends JPanel {
   private static final int TAB_COUNT = 3;
   private JTabbedPane tabbedPane = new JTabbedPane();
   private PlainDocument doc = new PlainDocument();
   private Action btnAction = new ButtonAction("Button");

   public MainGui2() {
      for (int i = 0; i < TAB_COUNT; i++) {
         tabbedPane.add("Tab " + (i + 1), createPanel(doc, btnAction));
      }
      setLayout(new BorderLayout());
      add(tabbedPane);
   }

   private JPanel createPanel(PlainDocument doc, Action action) {
      JTextArea textArea = new JTextArea(doc);
      textArea.setColumns(40);
      textArea.setRows(20);          

      JPanel panel = new JPanel();
      panel.add(new JScrollPane(textArea));
      panel.add(new JButton(action));
      return panel;
   }

   private class ButtonAction extends AbstractAction {
      public ButtonAction(String title) {
         super(title);
      }

      @Override
      public void actionPerformed(ActionEvent evt) {
         try {
            String text = "Button Pressed!\n";
            doc.insertString(doc.getLength(), text, null);
         } catch (BadLocationException e) {
            e.printStackTrace();
         }
      }
   }

   private static void createAndShowGui() {
      JFrame frame = new JFrame("MainGui2");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(new MainGui2());
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}

更好的方法是创建一个正式的模型类，将其注入(inject)每个 View ，每个选项卡式 Pane 的各个 Pane 。

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编辑
您在评论中声明:

Yes I can fix that by making calls to the instances but then I'm back to my original problem of having to make calls to each instance to affect a change in all the panel. Say for example I have a drawing panel and I need to call repaint(), I would have to make a call to 2 different instances to get both tabbedPanes to update. Is there any way around this?

是的，解决方案是使用 MVC，即模型- View -控制结构。您的模型包含您的整体程序逻辑， View 是用户所看到的，控件在两者之间进行交互。

考虑让您的模型通知控件或 View 其已更改，然后这会刺激重新绘制所有观察者 View 。