java - 如何分隔 JFrame 中的面板以分隔类
问题描述
我有这个 JFrame 命名MainFrame
,我试图将每个面板分成它自己的类。我尝试并失败了一些错误。
请查看我尝试过的代码。什么失败了,我做错了什么?
public class MainFrame extends JFrame {
static Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
private StartScreenPlayerPanel startScreenPlayerPanel;
private JPanel contentPane;
private JTable table;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MainFrame frame = new MainFrame();
System.out.println(screenSize);
frame.setMinimumSize(new Dimension(screenSize.width/2, screenSize.height/2));
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public MainFrame() {
startScreenPlayerPanel = new StartScreenPlayerPanel();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, (screenSize.width * 2 / 3), (screenSize.height * 2 / 3));
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
GridBagLayout gbl_contentPane = new GridBagLayout();
gbl_contentPane.columnWidths = new int[]{1200, 0};
gbl_contentPane.rowHeights = new int[]{74, 0, 446, 0, 0};
gbl_contentPane.columnWeights = new double[]{1.0, Double.MIN_VALUE};
gbl_contentPane.rowWeights = new double[]{0.0, 0.0, 1.0, 0.0, Double.MIN_VALUE};
contentPane.setLayout(gbl_contentPane);
JLabel lblTitle = new JLabel("The Coin Game",SwingConstants.CENTER);
lblTitle.setFont(new Font("Arial", Font.PLAIN, (int)screenSize.width/30));
GridBagConstraints gbc_lblTitle = new GridBagConstraints();
gbc_lblTitle.gridwidth = 2;
gbc_lblTitle.insets = new Insets(0, 0, 5, 0);
gbc_lblTitle.anchor = GridBagConstraints.NORTH;
gbc_lblTitle.fill = GridBagConstraints.HORIZONTAL;
gbc_lblTitle.gridx = 0;
gbc_lblTitle.gridy = 0;
contentPane.add(lblTitle, gbc_lblTitle);
JPanel StartScreenBtnPanel = new JPanel();
GridBagConstraints gbc_StartScreenBtnPanel = new GridBagConstraints();
gbc_StartScreenBtnPanel.gridwidth = 0;
gbc_StartScreenBtnPanel.insets = new Insets(0, 0, 5, 0);
gbc_StartScreenBtnPanel.fill = GridBagConstraints.BOTH;
gbc_StartScreenBtnPanel.gridx = 0;
gbc_StartScreenBtnPanel.gridy = 1;
contentPane.add(StartScreenBtnPanel, gbc_StartScreenBtnPanel);
StartScreenBtnPanel.setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));
JButton btnAddPlayer = new JButton("Add Player");
btnAddPlayer.setFont(new Font("Tahoma", Font.PLAIN, 16));
StartScreenBtnPanel.add(btnAddPlayer);
JButton btnStartGame = new JButton("Start Game");
btnStartGame.setFont(new Font("Tahoma", Font.PLAIN, 16));
StartScreenBtnPanel.add(btnStartGame);
我试图将代码分离到不同的类
// JPanel tblPanel = new JPanel();
// GridBagConstraints gbc_tblPanel = new GridBagConstraints();
// gbc_tblPanel.gridwidth = 2;
// gbc_tblPanel.insets = new Insets(0, 0, 5, 0);
// gbc_tblPanel.fill = GridBagConstraints.BOTH;
// gbc_tblPanel.gridx = 0;
// gbc_tblPanel.gridy = 2;
// contentPane.add(tblPanel, gbc_tblPanel);
// tblPanel.setLayout(new BorderLayout(0, 0));
// table = new JTable();
// tblPanel.add(table.getTableHeader(), BorderLayout.NORTH);
// table.getTableHeader().setFont(new Font("Arial", Font.BOLD, 16));
// table.setModel(new DefaultTableModel(
// new Object[][] {
// },
// new String[] {
// "New Player", "Initial Points"
// }
// ) {
// Class[] columnTypes = new Class[] {
// String.class, Integer.class
// };
// public Class getColumnClass(int columnIndex) {
// return columnTypes[columnIndex];
// }
// });
// table.getColumnModel().getColumn(0).setResizable(false);
// table.getColumnModel().getColumn(0).setMinWidth(14);
// tblPanel.add(table, BorderLayout.CENTER);
我试过的
在MainFrame
课堂 结束时
contentPane.add(startScreenPlayerPanel, startScreenPlayerPanel.getSSPPConstraints());
}
public StartScreenPlayerPanel getStartScreenPlayerPanel() {
return startScreenPlayerPanel;
}
新班级——StartScreenPlayerPanel
public class StartScreenPlayerPanel extends JFrame {
MainFrame mainframe;
private JTable table;
private GridBagConstraints gbc_tblPanel = new GridBagConstraints();
public StartScreenPlayerPanel() {
JPanel tblPanel = new JPanel();
gbc_tblPanel.gridwidth = 2;
gbc_tblPanel.insets = new Insets(0, 0, 5, 0);
gbc_tblPanel.fill = GridBagConstraints.BOTH;
gbc_tblPanel.gridx = 0;
gbc_tblPanel.gridy = 2;
tblPanel.setLayout(new BorderLayout(0, 0));
table = new JTable();
tblPanel.add(table.getTableHeader(), BorderLayout.NORTH);
table.getTableHeader().setFont(new Font("Arial", Font.BOLD, 16));
table.setModel(new DefaultTableModel(new Object[][] {}, new String[] { "New Player", "Initial Points" }) {
Class[] columnTypes = new Class[] { String.class, Integer.class };
public Class getColumnClass(int columnIndex) {
return columnTypes[columnIndex];
}
});
table.getColumnModel().getColumn(0).setResizable(false);
table.getColumnModel().getColumn(0).setMinWidth(14);
tblPanel.add(table, BorderLayout.CENTER);
}
public GridBagConstraints getSSPPConstraints(){
return gbc_tblPanel;
}
}
解决方案
我正在尝试将每个面板分开到它自己的类
public class StartScreenPlayerPanel extends JFrame {
好的,那你为什么要扩展 JFrame?
如果要向主框架添加面板,则扩展JPanel
:
public class StartScreenPlayerPanel extends JPanel {
现在因为您的类“是”JPanel,您只需设置面板的布局管理器并向其添加组件。
public StartScreenPlayerPanel()
{
setLayout(new BorderLayout());
table = new JTable();
table.setModel( ... );
add(table.getTableHeader(), BorderLayout.NORTH);
add(table, BorderLayout.CENTER);
}
不需要getSSPPConstraints()
这个类中的方法。“StartScreenPlayerPanel”不知道也不关心面板的使用方式。它只担心自己类中组件的布局。
结果是一个 JPanel,其中一个 JTable 添加到了 JPanel。
注意:通常在使用 JTable 时,您会使用:
//add(table.getTableHeader(), BorderLayout.NORTH);
//add(table, BorderLayout.CENTER);
add(new JScrollPane(table), BorderLayout.CENTER);
滚动窗格会自动将表头添加到自身。
现在在您的主类中,您将面板添加到内容窗格:
//contentPane.add(startScreenPlayerPanel, startScreenPlayerPanel.getSSPPConstraints());
GridBagConstraints gbc_playerPanel = new GridBagConstraints();
gbc_playerPanel.gridwidth = 2;
gbc_playerPanel.insets = new Insets(0, 0, 5, 0);
gbc_playerPanel.fill = GridBagConstraints.BOTH;
gbc_playerPanel.gridx = 0;
gbc_playerPanel.gridy = 2;
contentPane.add(startScreenPlayeerPanel, gbc_playerPanel).
也就是说,约束是将面板添加到内容面板的类的属性。
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