无法将列宽设置为零，即不使列不可见 [英] could not set the column width to zero i.e. not made column invisible

问题描述

我试图从 JTable 创建一个列，通过将宽度设置为零而不可见但是它不会发生并且它仍然可见width = 15.这是代码 -

I am trying to make one column from JTable, invisible by setting width to zero but it could not happen and it remain visible to width = 15. Here is code -

public void restoreColumnWithWidth(int column, int width) {
        try {
            TableColumn tableColumn = table.getColumnModel().getColumn(column);
            table.getTableHeader().setResizingColumn(tableColumn);
            tableColumn.setWidth(width);
            tableColumn.setMaxWidth(width);
            tableColumn.setMinWidth(width);
            tableColumn.setPreferredWidth(width);
        } catch (Exception ex) {
        }
    }

代码出了什么问题？

推荐答案

• 不，永远不要删除 TableColumn 来自 TableModel ，这是错误的建议，而不是使用内置方法 JTable #removeColumn（TableColumn aColumn），

  • not, never to remove TableColumn from TableModel, this is wrong suggestion, instead of to use built-in method JTable#removeColumn(TableColumn aColumn),

    注意，此方法仅从View中删除列，在模型中删除列仍然显示，并且您可以还原，通过以下方式显示已删除的列使用 JTable＃addColumn（TableColumn aColumn）

    notice, this method remove column only from View, in the model is removed column still presents, and you can revert that, visible the removed column by using JTable#addColumn(TableColumn aColumn)

    编辑

    import java.awt.BorderLayout;
    import java.awt.EventQueue;
    import java.awt.Font;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.util.Stack;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JScrollPane;
    import javax.swing.JTable;
    import javax.swing.WindowConstants;
    import javax.swing.table.DefaultTableModel;
    import javax.swing.table.TableColumn;
    import javax.swing.table.TableColumnModel;
    
    public class TableRowHeight {
    
        private static final long serialVersionUID = 1L;
        private JFrame frame = new JFrame("p*s*s*s*s*t*t");
        private String[] columnNames = {"one", "two", "Playing with", "four", "five",};
        private String[][] data = {
            {"aaaaaa", "bbbbbb", "cccccc", "dddddd", "eeeeeee",},
            {"bbbbbb", "cccccc", "dddddd", "eeeeeee", "aaaaaa",},
            {"cccccc", "dddddd", "eeeeeee", "aaaaaa", "bbbbbb",},
            {"dddddd", "eeeeeee", "aaaaaa", "bbbbbb", "cccccc",},
            {"eeeeeee", "aaaaaa", "bbbbbb", "cccccc", "dddddd",}};
        private JTable table = new JTable(new DefaultTableModel(data, columnNames));
        private TableColumnModel tcm = table.getColumnModel();
        private Stack<TableColumn> colDeleted = new Stack<TableColumn>();
        private JButton restoreButton = new JButton("Restore Column Size");
        private JButton hideButton = new JButton("Set Column Size to Zero");
        private JButton deleteButton = new JButton("Delete Column");
        private JButton addButton = new JButton("Restore Column");
    
        public TableRowHeight() {
            table.setRowMargin(4);
            table.setRowHeight(30);
            table.setFont(new Font("SansSerif", Font.BOLD + Font.PLAIN, 20));
            JScrollPane scrollPane = new JScrollPane(table);
            for (int i = 0; i < (tcm.getColumnCount()); i++) {
                tcm.getColumn(i).setPreferredWidth(100);
            }
            table.setPreferredScrollableViewportSize(table.getPreferredSize());
            restoreButton.addActionListener(new ActionListener() {
    
                public void actionPerformed(ActionEvent e) {
                    tcm.getColumn(2).setPreferredWidth(100);
                }
            });
            hideButton.addActionListener(new ActionListener() {
    
                public void actionPerformed(ActionEvent e) {
                    tcm.getColumn(2).setPreferredWidth(000);
                }
            });
            deleteButton.addActionListener(new ActionListener() {
    
                public void actionPerformed(ActionEvent e) {
                    if (table.getColumnCount() > 0) {
                        TableColumn colToDelete = table.getColumnModel().getColumn(table.getColumnCount() - 1);
                        table.removeColumn(colToDelete);
                        table.validate();
                        colDeleted.push(colToDelete);
                        addButton.setEnabled(true);
                    } else {
                        deleteButton.setEnabled(false);
                    }
                }
            });
            addButton.addActionListener(new ActionListener() {
    
                public void actionPerformed(ActionEvent e) {
                    if (colDeleted.size() > 0) {
                        table.addColumn(colDeleted.pop());
                        table.validate();
                        deleteButton.setEnabled(true);
                    } else {
                        addButton.setEnabled(false);
                    }
                }
            });
            JPanel btnPanel = new JPanel();
            btnPanel.add(hideButton);
            btnPanel.add(restoreButton);
            btnPanel.add(deleteButton);
            btnPanel.add(addButton);
            frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
            frame.add(scrollPane, BorderLayout.CENTER);
            frame.add(btnPanel, BorderLayout.SOUTH);
            frame.pack();
            frame.setLocation(150, 150);
            frame.setVisible(true);
        }
    
        public static void main(String[] args) {
            EventQueue.invokeLater(new Runnable() {
    
                public void run() {
                    TableRowHeight frame = new TableRowHeight();
                }
            });
        }
    }
    

    EDIT2

    你必须检查

    JTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    JTable.getTableHeader().setReorderingAllowed(false);
    

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