2 
DefaultTableModel modeltable = new DefaultTableModel(8,8);

table = new JTable(modeltable);
table.setBorder(BorderFactory.createLineBorder (Color.blue, 2));

int height = table.getRowHeight();
table.setRowHeight(height=50);

table.setColumnSelectionAllowed(true);
table.setDragEnabled(true);

le1.setFillsViewportHeight(true);

panel.add(table);
panel.setSize(400,400);

    DnDListener dndListener = new DnDListener();
    DragSource dragSource = new DragSource();
    DropTarget dropTarget1 = new DropTarget(table, dndListener);

   DragGestureRecognizer dragRecognizer2 = dragSource.
            createDefaultDragGestureRecognizer(option1, 
          DnDConstants.ACTION_COPY, dndListener);
   DragGestureRecognizer dragRecognizer3 = dragSource.
            createDefaultDragGestureRecognizer(option2, 
            DnDConstants.ACTION_COPY, dndListener);


}
}

我在将鼠标侦听器添加到作为放置目标的“表”时遇到问题，无论它从鼠标中落下的任何地方都接受放置组件。在此代码中，当组件放入放置目标时，它始终会转到默认位置。我无法自定义放置目标的位置。请有人帮我解决这个问题。提前致谢

4

1 回答 1

5

那些听众太低级了。实现 dnd 的适当方法是实现自定义 TransferHandler 并将该自定义处理程序设置为您的表。

 public class MyTransferHandler extends TransferHandler {

    public boolean canImport(TransferHandler.TransferSupport info) {
        // we only import Strings
        if (!info.isDataFlavorSupported(DataFlavor.stringFlavor)) {
            return false;
        }

        JTable.DropLocation dl = (JTable.DropLocation)info.getDropLocation();
        // ... your code to decide whether the data can be dropped based on location 
    }

    public boolean importData(TransferHandler.TransferSupport info) {
        if (!info.isDrop()) {
            return false;
        }

        // Check for String flavor
        if (!info.isDataFlavorSupported(DataFlavor.stringFlavor)) {
            displayDropLocation("Table doesn't accept a drop of this type.");
            return false;
        }

        JTable.DropLocation dl = (JTable.DropLocation)info.getDropLocation();
        // ... your code to handle the drop
   }

}

// usage
myTable.setTransferHandler(new MyTransferHandler());

有关详细信息，请参阅 Swing 标签描述中链接到的在线教程中的示例，即拖放一章。上面的代码片段是从 BasicDnD 示例中复制的。

于 2012-07-08T08:46:31.033 回答