4

当我尝试从 java 中的表中删除行时，我遇到了一些问题。特别是，我使用DefaultTableModel, 并且当我试图删除一行时，使用该removeRow(int row)方法，最后一行被删除，不管是什么row。例如，假设我们有六行。当removeRow(0)or removeRow(2)orremoveRow(5)被调用时，最后一行总是被删除。任何想法，为什么会这样？

谢谢

- -更新

当按下 jtable 的特定单元格时，应删除相应的行。 

    class TagsTableMA extends MouseAdapter {

    @Override
    public void mousePressed(MouseEvent e){
        Point p = e.getPoint();
        int row = tagsJT.rowAtPoint(p);
        int column = tagsJT.columnAtPoint(p);

        if (column == COLUMN_DELETE_TAG){
            DocDialog docDialog = new DocDialog(parentMainJF, 
                                                true, 
                                                null, 
                                                "Please confirm...", 
                                                "Are you sure you want to delete the \"" + 
                                                tagsJT.getValueAt(row, COLUMN_TAG_NAME) +
                                                "\" tag?",
                                                DocDialog.TYPE_YES_NO);
            docDialog.show();
            int answer = docDialog.getAnswer();

            if (answer == DocDialog.YES)                                                
                    model.removeRow(row);
        }
    }   
}

--- update no2 这是我的问题的一些代码。我删除了一些无关紧要的东西。

import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class MainJF extends JFrame {

public MainJF(){
    this.add(createTagsTable());
    setMinimumSize(new java.awt.Dimension(200,400));
}

 private JTable createTagsTable(){

    String[] columnNames = {"",          
                            "Tag",
                            "",
                            "",
                            ""};


    Object[][] data = new Object[10][columnNames.length];
    for (int i=0; i<data.length; i++){
        data[i][COLUMN_CHECK] = false;
        data[i][COLUMN_TAG_NAME] = "Tag " + i;
        data[i][COLUMN_TAG_ID] = i;
        data[i][COLUMN_EDIT_TAG] = "edit";
        data[i][COLUMN_DELETE_TAG] = "delete";
    }

    model = new TagsSelectionTableModel(columnNames, data);
    tagsJT = new JTable(model);

    tagsJT.setRowSelectionAllowed(true);
    tagsJT.addMouseListener(new TagsTableMA());

    return tagsJT;
}


class TagsSelectionTableModel extends DefaultTableModel{

    public TagsSelectionTableModel(String[] columnNames, Object[][] data){
        super(data, columnNames);
        this.columnNames = columnNames;
        this.data = data;
    }

    private String[] columnNames;
    private Object[][] data;


    @Override
    public Object getValueAt(int row, int col) { return data[row][col]; }
}

  class TagsTableMA extends MouseAdapter{

    @Override
    public void mousePressed(MouseEvent e){
        Point p = e.getPoint();
        int row = tagsJT.rowAtPoint(p);
        int column = tagsJT.columnAtPoint(p);

        if (column == COLUMN_DELETE_TAG){
            int irow = tagsJT.convertRowIndexToView(row);     
            model.removeRow(irow);
        }
    }
}


private JTable tagsJT;
private TagsSelectionTableModel model;   

private static int COLUMN_CHECK = 0;
private static int COLUMN_TAG_NAME = 1;
private static int COLUMN_TAG_ID = 2;
private static int COLUMN_EDIT_TAG = 3;
private static int COLUMN_DELETE_TAG = 4;


public static void main(String args[]) {
    new MainJF().setVisible(true);
}
}
4

2 回答 2

5

row获得的是columnAtPoint()在视图坐标中，而removeRow()假设是模型坐标。引用相关教程部分：

这种区别并不重要，除非您查看的数据已通过排序、过滤或用户对列的操作进行了重新排列。

如果是这样，您将需要使用，在排序和过滤convertRowIndexToModel()末尾附近描述，它建议：

使用分拣机时，请始终记住转换单元格坐标。

另外，考虑使用 aListSelectionListener而不是 a MouseAdapter。

附录：您的实现getValueAt()继续访问提供给构造函数的数组，而模型的数据实际上存储在父实现中。如果您确实需要对模型的数据结构进行更多控制，请扩展AbstractTableModel，如下所示。

import java.awt.EventQueue;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

/** @see https://stackoverflow.com/a/11237205/230513 */
public class MainJF extends JFrame {

    private JTable tagsJT;
    private TagsSelectionTableModel model;
    private static int COLUMN_CHECK = 0;
    private static int COLUMN_TAG_NAME = 1;
    private static int COLUMN_TAG_ID = 2;
    private static int COLUMN_EDIT_TAG = 3;
    private static int COLUMN_DELETE_TAG = 4;

    public MainJF() {
        this.add(new JScrollPane(createTagsTable()));
        pack();
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    private JTable createTagsTable() {

        String[] columnNames = {"0", "Tag", "2", "3", "4"};

        Object[][] data = new Object[10][columnNames.length];
        for (int i = 0; i < data.length; i++) {
            data[i][COLUMN_CHECK] = false;
            data[i][COLUMN_TAG_NAME] = "Tag " + i;
            data[i][COLUMN_TAG_ID] = i;
            data[i][COLUMN_EDIT_TAG] = "edit";
            data[i][COLUMN_DELETE_TAG] = "delete";
        }
        model = new TagsSelectionTableModel(columnNames, data);
        tagsJT = new JTable(model);
        tagsJT.setRowSelectionAllowed(true);
        tagsJT.addMouseListener(new TagsTableMA());
        return tagsJT;
    }

    class TagsSelectionTableModel extends DefaultTableModel {

        public TagsSelectionTableModel(String[] columnNames, Object[][] data) {
            super(data, columnNames);
        }
    }

    class TagsTableMA extends MouseAdapter {

        @Override
        public void mousePressed(MouseEvent e) {
            Point p = e.getPoint();
            int row = tagsJT.rowAtPoint(p);
            int col = tagsJT.columnAtPoint(p);
            if (col == COLUMN_DELETE_TAG) {
                model.removeRow(row);
            }
        }
    }

    public static void main(String args[]) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new MainJF().setVisible(true);
            }
        });
    }
}
于 2012-06-28T08:59:03.220 回答
3

看 的removeRow(int)方法的代码DefaultTableModel，很明显它会移除 backing 对应索引处的行数组Vector：

 public void removeRow(int row) {
    dataVector.removeElementAt(row);
    fireTableRowsDeleted(row, row);
}

（来自Java 6）。

我能想到两种可能：

  1. 您已扩展DefaultTableModel并更改了此方法的实现。（我怀疑是这种情况——你可能会在你的帖子中承认这一点）

  2. 您有一个用于表格的自定义渲染器，它根据单元格的行索引绘制单元格数据。

于 2012-06-28T02:07:28.190 回答