java添加鼠标侦听器以删除目标

Question

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拖放目标的“表”中时遇到了一个问题，即无论拖放组件从鼠标中拖放到哪里，都要接受拖放组件。在这段代码中，当组件下降到下降目标时，它总是会进入默认位置。我无法自定义放置目标的位置。请有人帮我做这个。 提前谢谢

Answer 1

那些听众的水平太低了。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到表中

 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，请参见Swing标记描述中链接到的在线教程中的示例，即chapter Drag and Drop，上面的代码片段是c&；从基本示例中删除