[英]JTable drag and drop
我正在尝试实现JTable拖放,基于此问题( 如何在JTable中拖放行? )和此问题( 移动行 ),我已经能够使其在大多数情况下都能正常工作在JTable中 )略微调整了我的需求。
我也遇到的问题是,尽管使用TableModel像在这里找到的那样( 在JTable中移动行 ),例如拖入三行JTable,将第一行拖到第二行,但在大多数情况下都可以正常工作尽管将例如第一行拖到第三行下方的底部会导致ArrayIndexOutOfBoundsException,并且该行消失。 该错误发生在以下行:getDataVector()。add(to,o);
使用“ 在JTable中移动行”中的以下代码会发生此问题:
public class ReorderableTableModel extends DefaultTableModel implements Reorderable {
public void reorder(int from, int to) {
Object o = getDataVector().remove(from);
getDataVector().add(to, o);
fireTableDataChanged();
}
}
关于为什么它可能行不通的问题,Aaron似乎也有一个答案:尽管我不确定如何在我的方案中实现Aaron的答案,但在JTable中移动行 。
Stacktrace是:
java.lang.ArrayIndexOutOfBoundsException: 2 > 1
at java.util.Vector.insertElementAt(Vector.java:598)
at java.util.Vector.add(Vector.java:814)
at com.testproject.test.table.TableModel.reorder(TableModel.java:25)
at com.testproject.test.table.TableRowTransferHandler.importData(TableRowTransferHandler.java:49)
at javax.swing.TransferHandler$DropHandler.drop(TransferHandler.java:1544)
at java.awt.dnd.DropTarget.drop(DropTarget.java:455)
at javax.swing.TransferHandler$SwingDropTarget.drop(TransferHandler.java:1282)
at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(SunDropTargetContextPeer.java:538)
at sun.lwawt.macosx.CDropTargetContextPeer.processDropMessage(CDropTargetContextPeer.java:143)
at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(SunDropTargetContextPeer.java:852)
at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(SunDropTargetContextPeer.java:776)
at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:48)
at java.awt.Component.dispatchEventImpl(Component.java:4746)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processDropTargetEvent(Container.java:4599)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4461)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2750)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
我无法解决此问题,但是解决此问题的最佳方法是什么?
由于已从Vector
删除了一个元素,因此应考虑将某些indexes
变为index-=1
;
public void reorder(int from, int to) {
Object o = getDataVector().remove(from);
getDataVector().add(from>to?to:to-1, o);
fireTableDataChanged();
}
检查from
的索引是否大于to
的索引。 如果是这样,则我们知道to
的索引没有更改,如果没有更改,请通过删除索引中的一个来更改它。
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