java - 在 Mac OS X 上使用 JTable 拖放

Question

我对 mac 上的 DnD 和 JTable 有疑问。如果您启动以下程序并在表中单击(快速)，有时会选择某些内容，有时会在一段时间后执行 DnD 应用程序崩溃或至少 DnD 不会可能了。我在 2 台 Mac 上对其进行了测试。

Java 版本:1.6.0_35Mac 操作系统:10.6.8

有人能证实吗？任何解决方法？

package tablednd;

import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.SwingUtilities;

public class TableDnD {
public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
            Object[][] data = {
                {"Mary", "Campione", "Snowboarding", new Integer(5), new Boolean(false)},
                {"Alison", "Huml", "Rowing", new Integer(3), new Boolean(true)},
                {"Kathy", "Walrath", "Chasing toddlers", new Integer(2), new Boolean(false)},
                {"Mark", "Andrews", "Speed reading", new Integer(20), new Boolean(true)},
                {"Angela", "Lih", "Teaching high school", new Integer(4), new Boolean(false)}
            };

            String[] columnNames = {"First Name", "Last Name", "Sport", "# of Years", "Vegetarian"};

            final JTable table = new JTable(data, columnNames);
            JFrame frame = new JFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            table.setDragEnabled(true);
            frame.add(table);
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        }
    });
}
}

Answer 1

当将拖动的行放到表格的其他任何位置时，我(有时)会在 Mac OS X 10.5.8 时收到如下所示的错误。目标选择矩形保留在屏幕上，无法进行进一步的拖动操作。我不确定为什么，但我想单元格未被识别为一行的合适目的地。

2012-10-14 14:14:23.912 java[44061:10b] *** -[NSWindowViewAWT draggingEnded:]:    unrecognized selector sent to instance 0x1001e71402012-10-14 14:14:23.913 java[44061:10b] *** -[NSWindowViewAWT draggingEnded:]:    unrecognized selector sent to instance 0x1001e7140

Dropping the dragged row on another application works as expected.

As an aside, auto-boxing can simplify the initialization code:

Object[][] data = {
    {"Mary", "Campione", "Snowboarding", 5, false},
    {"Alison", "Huml", "Rowing", 3, true},
    {"Kathy", "Walrath", "Chasing toddlers", 2, false},
    {"Mark", "Andrews", "Speed reading", 20, true},
    {"Angela", "Lih", "Teaching high school", 4, false}
};

附录:这张图片显示了正在进行的拖动；触发异常后，拖动框架时灰色矩形保持不动。

作为解决方法，有一个解决方案 disable the grey rectangle altogether .