按钮，JTextField和JComboBox不可单击

Question

The program consists of a tabbed view with a few JTextField 's and JButton s in the first two and 2 JTable s and JButton in the third. The buttons work fine in the first two tabs, but on the third it is un-clickable. I tried changing the button to something else like a JComboBox or JTextField but those are uneditable and unclickable also. Setting the setEnabled() and setEditable() functions to true doesn't seem to work. I have no idea what's going on.

The only thing i have done different from normal is this piece of code to forcefully repaint the tab when I click on a cell in the table. But even when this hasn't been called i still cant

ContentIWantToRepaint.this.paintImmediately(ContentIWantToRepaint.this.getVisibleRect());

Some other information about the layout: The contents of the tab are held in a JPanel with a GridBagLayout

• JTextField
• Table Header
• Table Contents
• JTextField
• Table Header
• Table Contents
• Button

Any suggestions?

checkOutPanel.java

import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Vector;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.ScrollPaneConstants;
import javax.swing.table.DefaultTableModel;


public class checkOutPanel extends JPanel {
    private JTable userTable;
    private JTable bookTable;
    private JScrollPane scrollUserTable, scrollBookTable;
    private JLabel userLabel, bookLabel;
    private DefaultTableModel userTableModel = new DefaultTableModel(){
        public boolean isCellEditable(int row, int column){return false;}
    };
    private DefaultTableModel bookTableModel = new DefaultTableModel(){
        public boolean isCellEditable(int row, int column){return false;}
    };
    private int selectedUser, selectedBook;
    private JComboBox date_month, date_day, date_year;

    public checkOutPanel(){

        JPanel mainGrid = new JPanel();//panel that will hold all stuff in tab
        JPanel buttonPanel = new JPanel();//panel for holding buttons

        mainGrid.setLayout(new GridBagLayout());
        GridBagConstraints c = new GridBagConstraints();
        c.gridx=0; c.gridy=0; //first row first column
        c.anchor = GridBagConstraints.WEST;//align left
        c.fill = GridBagConstraints.HORIZONTAL;

        //1 row, 2 columns, 15 horizontal padding, 0 vertical padding
        //buttonPanel.setLayout(new GridLayout(1,2,15,0));

        //labels to describe what the user has to do
        userLabel = new JLabel("User :");
        bookLabel = new JLabel("Book :");
        JLabel dateLabel = new JLabel("Date :");
        JPanel datePanel = new JPanel();

        bookTable = new JTable(bookTableModel);
        bookTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        userTable = new JTable(userTableModel);
        userTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        Dimension d = new Dimension(500, 120);

        scrollBookTable = new JScrollPane(bookTable); 
        scrollBookTable.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS); 
        scrollBookTable.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); 
        scrollBookTable.setMaximumSize(d);
        scrollBookTable.setMinimumSize(d);
        scrollBookTable.setPreferredSize(d);

        scrollUserTable = new JScrollPane(userTable); 
        scrollUserTable.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS); 
        scrollUserTable.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); 
        scrollUserTable.setMaximumSize(d);
        scrollUserTable.setMinimumSize(d);
        scrollUserTable.setPreferredSize(d);

        updateTables();

        //String[] month = {"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};       

        //Vector<Integer> days = new Vector<Integer>();
        //for (int i=1 ; i<=31 ; i++) { days.add(i); }

        //Vector<Integer> years = new Vector<Integer>();
        //for (int i=2012 ; i>=1900 ; i--) { years.add(i); }

        //date_month = new JComboBox(days);
        JButton testButton = new JButton("WORK!!!!!!!");
        //date_day = new JTextField(6);
        //date_year = new JTextField(6);

        //datePanel.add(dateLabel);
        //datePanel.add(date_month);
        //datePanel.add(date_day);
        //datePanel.add(date_year);



        mainGrid.add(userLabel, c);                     c.gridy++;
        mainGrid.add(userTable.getTableHeader(), c);    c.gridy++;
        mainGrid.add(scrollUserTable, c);               c.gridy++;
        c.insets = new Insets(15, 0, 0, 0);//put some padding between users and books
        mainGrid.add(bookLabel, c);                     c.gridy++;
        c.insets= new Insets(0,0,0,0);//back to no padding
        mainGrid.add(bookTable.getTableHeader(), c);    c.gridy++;
        mainGrid.add(scrollBookTable, c);               c.gridy++;
        c.insets = new Insets(15, 0, 0, 0);//put some padding between books and date

        mainGrid.add(testButton, c);                        c.gridy++;





        this.add(mainGrid);//add contents to tab


        userTable.addMouseListener(new mouseListener());
        bookTable.addMouseListener(new mouseListener());

    }

    public class mouseListener implements MouseListener{
        @Override
        public void mouseClicked(MouseEvent e) {}
        @Override
        public void mouseEntered(MouseEvent e) {}
        @Override
        public void mouseExited(MouseEvent e) {}
        @Override
        public void mousePressed(MouseEvent e) {}
        @Override
        public void mouseReleased(MouseEvent e) {
            if(e.getSource()==userTable){
                selectedUser=userTable.getSelectedRow();
                userLabel.setText("User :  "+ (selectedUser!=-1 ? selectedUser : ""));

                //don't know why i should need to use this, but it makes it work
                checkOutPanel.this.paintImmediately(checkOutPanel.this.getVisibleRect());


            }else if(e.getSource()==bookTable){
                selectedBook = bookTable.getSelectedRow();
                System.out.println("Date Month : "+date_month.getSelectedItem().toString());
                bookLabel.setText("Book :  "+ (selectedBook!=-1 ? selectedBook : ""));

                //don't know why i should need to use this, but it makes it work
                checkOutPanel.this.paintImmediately(checkOutPanel.this.getVisibleRect());


            }
        }
    }





    private void updateTables(){
        bookTableModel.setDataVector(fillBookData(SystemStart.getDbName()), fillBookColNames());
        userTableModel.setDataVector(fillUserData(SystemStart.getDbName()), fillUserColNames());
    }




    private Vector<String> fillUserColNames(){
        Vector<String> colNames = new Vector<String>();
        colNames.add("ID");
        colNames.add("First");
        colNames.add("Last");
        colNames.add("Phone");
        colNames.add("Email");
        colNames.add("Address");
        colNames.add("City");
        colNames.add("State");
        colNames.add("Zip");        
        return colNames;
    }
    private Vector<String> fillBookColNames(){
        Vector<String> colNames = new Vector<String>();
        colNames.add("Title");
        colNames.add("Format");
        colNames.add("Author");
        colNames.add("ISBN");
        colNames.add("Year Pub.");
        colNames.add("Publisher");
        colNames.add("Call #");
        colNames.add("Copy #");     
        return colNames;    
    }
    private Vector<Vector<String>> fillUserData(String dbName){
        Vector<Vector<String>> v = new Vector<Vector<String>>();
        Vector<String> u;
        for (int i=0; i<10; i++){
            u = new Vector<String>(9);
            u.add(""+i);
            u.add("First");
            u.add("Last");
            u.add("Phone");
            u.add("Email");
            u.add("Address");
            u.add("City");
            u.add("State");
            u.add("Zip");
            v.add(u);
        }
        return v;
    }

    private Vector<Vector<String>> fillBookData(String dbName) {
        Vector<Vector<String>> v = new Vector<Vector<String>>();
        Vector<String> b;
        for (int i=0; i<10; i++){//only include books that arent check out
            b = new Vector<String>(8);
            b.add("Title "+i);
            b.add("Format");
            b.add("Author");
            b.add("ISBN");
            b.add("Year Pub.");
            b.add("Publisher");
            b.add("Call #");
            b.add("Copy #");
            v.add(b);
        }
        return v;
    }
}

Use this file to see how it doesn't work:

import javax.swing.JFrame;

public class SystemStart{
    private static String dbName = "dbnamehere.db";

    public static void main(String[] args) {

        //new TabbedFrame("Libary System");
        JFrame jf = new JFrame("WORK!");
        jf.add(new checkOutPanel());
        jf.pack();
        jf.setVisible(true);
            jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static String getDbName(){return dbName;}

}

Answer 1

You're adding to the panel a label, then the table's header and then the scrollpane which contains the table (...and the table header). Remove the two lines where you're adding to mainGrid the table headers (you should just add the scrollpanes):

    mainGrid.add(userTable.getTableHeader(), c);    c.gridy++;
    mainGrid.add(bookTable.getTableHeader(), c);    c.gridy++;

Your button will work now.