java - 如何在 Java 中选择标题时选择 JTable 列

Question

我找到了一段代码，通过在标题上应用鼠标监听器，可以在单击 JTable 标题时选择一列。但不幸的是，在单击表格单元格时，整个 JTable 列都被选中，并且选择策略没有像以前那样反转。相反，它会在选择一个单元格时选择整列。

代码:-

import java.awt.Component;
import java.awt.Cursor;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;

public class HeaderLocation {  
    private JTable getTable() {  
        int rows = 32, cols = 4;  
        String[] colIds = { "column 1", "column 2", "column 3", "column 4" };  
        Object[][] data = new Object[rows][cols];  
        for(int row = 0; row < rows; row++) {  
            for(int col = 0; col < cols; col++) {  
                data[row][col] = "item " + (row*cols+col+1);  
            }  
        }  
        DefaultTableModel model = new DefaultTableModel(data, colIds);  
        final JTable table = new JTable(model);  
        final JTableHeader header = table.getTableHeader();  
        table.setCellEditor(new CustomCellEditor());
        header.setReorderingAllowed(false);  
        header.addMouseListener(new MouseAdapter() {  
            public void mouseClicked(MouseEvent e) {  
                int col = header.columnAtPoint(e.getPoint());  
                System.out.printf("click cursor = %d%n",  
                                   header.getCursor().getType());  
                if(header.getCursor().getType() == Cursor.E_RESIZE_CURSOR)  
                    e.consume();  
                else {  
                    //System.out.printf("sorting column %d%n", col); 
                    table.setColumnSelectionAllowed(true);
                    table.setRowSelectionAllowed(false);
                    table.clearSelection();
                    table.setColumnSelectionInterval(col,col);
                    //tableModel[selectedTab].sortArrayList(col);  
                }  
            }  
        });  


        return table;  
    }  

    private JMenuBar getMenuBar() {  
        final JMenu view = new JMenu("view");  
        ActionListener l = new ActionListener() {  
            public void actionPerformed(ActionEvent e) {  
                JMenuItem item = (JMenuItem)e.getSource();  
                String className = item.getActionCommand();  
                changePLAF(className, view.getTopLevelAncestor());  
            }  
        };  
        UIManager.LookAndFeelInfo[] info = UIManager.getInstalledLookAndFeels();  
        for(int j = 0; j < info.length; j++) {  
            JMenuItem item = new JMenuItem(info[j].getName());  
            item.setActionCommand(info[j].getClassName());  
            item.addActionListener(l);  
            view.add(item);  
        }  
        JMenuBar menuBar = new JMenuBar();  
        menuBar.add(view);  
        return menuBar;  
    }  

    private void changePLAF(String className, Component c) {  
        try {  
            UIManager.setLookAndFeel(className);  
        } catch(ClassNotFoundException cnfe) {  
            System.err.println("class not found: " + cnfe.getMessage());  
        } catch(InstantiationException ie) {  
            System.err.println("instantiation: " + ie.getMessage());  
        } catch(IllegalAccessException iae) {  
            System.err.println("illegal access: " + iae.getMessage());  
        } catch(UnsupportedLookAndFeelException ulafe) {  
            System.err.println("unsupported laf: " + ulafe.getMessage());  
        }  
        SwingUtilities.updateComponentTreeUI(c);  
    }  

    public static void main(String[] args) {  
        HeaderLocation test = new HeaderLocation();  
        JFrame f = new JFrame();  
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
        f.setJMenuBar(test.getMenuBar());  
        f.getContentPane().add(new JScrollPane(test.getTable()));  
        f.pack();  
        f.setLocation(200,200);  
        f.setVisible(true);  
    }  
}

自定义单元格编辑器.java

import java.awt.Component;

import javax.swing.DefaultCellEditor;
import javax.swing.JTable;
import javax.swing.JTextField;

public class CustomCellEditor extends DefaultCellEditor {

    public CustomCellEditor() {
        super(new JTextField());
        // TODO Auto-generated constructor stub
    }

    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
        table.clearSelection();
        table.setColumnSelectionAllowed(false);
        table.setRowSelectionAllowed(true);
        return super.getTableCellEditorComponent(table, value, isSelected, row, column);
        }

}  

从上面的代码:-

1.) 点击标题列被正确选中。2.) 但是在单击一个单元格时，整个列不仅会按预期选择一个单元格。我尝试反转列选择，但它没有按预期工作。

任何与此相关的帮助将不胜感激。

谢谢

Answer 1

您需要反转在 header.addMouseListener(new MouseAdapter() { back

中声明的代码行

来自

table.setColumnSelectionAllowed(true);
table.setRowSelectionAllowed(false);

到

table.setColumnSelectionAllowed(false);
table.setRowSelectionAllowed(true);

在 JTableHeader 之外的第一个 鼠标事件