在CellRenderer中显示选定的行和列

Question

我有一个JTable，每当我选择一个单元格时，我想打印它的行和列索引。出于这个原因，我使用getSelectedRow()和getSelectedColumn()方法。运行以下代码：

Class TestTimeTable

public class TestTimeTable extends JFrame{
    private final int rows = 10;
    private final int cols = 8;
    private final String daysOfTheWeek[] = {"MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY"};
    private final JPanel jTablePanel;
    private final JScrollPane scrollPane;
    private final JTable timeTable;
    private final Object[][] rowData;

    public TestTimeTable(){
        this.rowData = new Object[this.rows][this.cols];
        this.timeTable = new JTable(this.rowData,this.daysOfTheWeek){
            @Override
            public boolean isCellEditable(int row, int column) {
                return false;
            }
        };

        this.timeTable.setRowHeight(200, 200);
        this.timeTable.setFillsViewportHeight(true);
        this.timeTable.setOpaque(true);
        this.timeTable.setColumnSelectionAllowed(true);
        this.timeTable.setRowSelectionAllowed(true);
        this.timeTable.setCellSelectionEnabled(true);
        this.timeTable.setDefaultRenderer(Object.class, new BoardTableCellRenderer());
        this.scrollPane = new JScrollPane(this.timeTable, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);

        this.jTablePanel = new JPanel();
        this.jTablePanel.add(this.scrollPane);
        getContentPane().add(new JScrollPane(this.timeTable), BorderLayout.CENTER);
    }

    public int getColumn(){
        return this.timeTable.getSelectedColumn();
    }

    public int getRow(){
        return this.timeTable.getSelectedRow();
    }

    public JTable getTimeTable(){
        return this.timeTable;
    }

    public void createAndShowUI(){
        setSize(600, 600);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] argas){
        TestTimeTable tt = new TestTimeTable();
        tt.createAndShowGUI();
    }
}

Class BoardTableCellRenderer

class BoardTableCellRenderer extends DefaultTableCellRenderer {

    Component c;
    private static final long serialVersionUID = 1L;
    private final Color selectionBlue = new Color(131,166,198);
    private final MatteBorder border = new MatteBorder(1, 1, 0, 0, Color.BLACK);

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

        if (table.isCellSelected(row, column)){
            c.setBackground(this.selectionBlue);
            setBorder(this.border);
        } else {
            c.setBackground(Color.WHITE);
        }

        if(isSelected){
            JOptionPane.showMessageDialog(null, table.getSelectedRow() + ""+table.getSelectedColumn(),null, JOptionPane.INFORMATION_MESSAGE);
        }
        return c;
    }
}

每当我选择一个单元格时，会出现JOptionPane框架，然后该应用会冻结。所以我必须一直打断它。有人可以告诉我为什么会这样吗？我该怎么做才能解决它？

Answer 1

• 使用，覆盖来自boolean isSelected, boolean hasFocus的{​​{1}}（built_in方法），而不是引用回JTable - getTableCellRendererComponent，重置其他语句中其余单元格的Color，例如简单的躯干

table.isCellSelected(row, column)

• 更改ListSelectionMode for JTable

• 删除所有这些.Xxx，没用了

• 不要使用setSize，而是使用JFrame.pack（）和/或为JScrollPane设置大小，例如 private class StatusRenderer implements TableCellRenderer { private static final long serialVersionUID = 1L; @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { if (isSelected) { setBackground(table.getSelectionBackground()); } else { setBackground(table.getBackground()); } return this; } } （对于合理的数字或行和列，否则使用Dimension（x，x））

修改

table.setPreferredScrollableViewportSize(table.getPreferredSize());

Answer 2

  

我有一个JTable，每当我选择一个单元格时，我想打印它的行和列索引。

我会覆盖JTable的changeSelection(...)方法：

JTable table = new JTable(data, columnNames)
{

    public void xxxchangeSelection(
        int row, int column, boolean toggle, boolean extend)
    {
        super.changeSelection(row, column, toggle, extend);

        System.out.println(row + " : " + column);
    }
};