如何将JPanel设置为JTabbedPane大小？

Question

我试图将一个JPanel添加到另一个中，以使其适合父`JPanel大小。

我有一个JPanel ，其中包含使用以下代码的JTable和JButton ：

JScrollPane attributeTable = new JScrollPane(this);

JPanel attributesPanel = new JPanel();

JPanel textFieldPanel=new JPanel();
JPanel buttonsPanel = new JPanel();

JButton newAttributeButton = new JButton("New Attribute");

attributesPanel.add(textFieldPanel, BorderLayout.CENTER);
attributesPanel.add(buttonsPanel, BorderLayout.SOUTH);

newAttributeButton.addActionListener(AttributesTableController.getInstance());

GroupLayout layout = new GroupLayout(textFieldPanel);
textFieldPanel.setLayout(layout);

// Turn on automatically adding gaps between components
layout.setAutoCreateGaps(true);

// Turn on automatically creating gaps between components that touch
// the edge of the container and the container.
layout.setAutoCreateContainerGaps(true);

// Create a sequential group for the horizontal axis.

GroupLayout.SequentialGroup hGroup = layout.createSequentialGroup();

// The sequential group in turn contains two parallel groups.
// One parallel group contains the labels, the other the text fields.
// Putting the labels in a parallel group along the horizontal axis
// positions them at the same x location.
//
// Variable indentation is used to reinforce the level of grouping.
hGroup.addGroup(layout.createParallelGroup().
         addComponent(attributeTable).addComponent(newAttributeButton));
layout.setHorizontalGroup(hGroup);

// Create a sequential group for the vertical axis.
GroupLayout.SequentialGroup vGroup = layout.createSequentialGroup();
vGroup.addGroup(layout.createParallelGroup(Alignment.BASELINE).addComponent(attributeTable));
vGroup.addGroup(layout.createParallelGroup(Alignment.CENTER).
         addComponent(newAttributeButton));
layout.setVerticalGroup(vGroup);

当我将此面板（命名为attributesPanel ）放入JTabbedPane的选项卡中时，它仅显示JTable和JButton ，但位于面板的中央。 我希望attributesPanel的尺寸与打开的选项卡的尺寸相同。

这是我用来将JPanel添加到我的JTabbedPane中的代码：

TabbedPane tabbedPane = new TabbedPane();
tabbedPane.setComponentAt(1, attributesPanel);

我尝试使用GridLayout ，它很好地适合了JPanel但是无法调整按钮的大小。 我尝试使用FlowLayout和GridBagLayout ，但由于存在相同的问题，因此无法正确显示它们。

先感谢您。

Answer 1

您的示例是不完整的浸液，很难分辨出哪里出了问题，但这也许会有所帮助：

JTable table = new JTable (12, 5);
JButton button = new JButton ("Button");

JPanel panel = new JPanel ();
panel.setLayout (new BorderLayout ());
panel.add (table, BorderLayout.CENTER);
panel.add (button, BorderLayout.SOUTH);

JTabbedPane tabbedPane = new JTabbedPane ();
tabbedPane.addTab ("Tab", panel);

JFrame frame = new JFrame ();
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.getContentPane ().setLayout (new BorderLayout ());
frame.getContentPane ().add (tabbedPane, BorderLayout.CENTER);
frame.pack ();
frame.setVisible (true);