[英]JTable drag and drop
我正在嘗試實現JTable拖放,基於此問題( 如何在JTable中拖放行? )和此問題( 移動行 ),我已經能夠使其在大多數情況下都能正常工作在JTable中 )略微調整了我的需求。
我也遇到的問題是,盡管使用TableModel像在這里找到的那樣( 在JTable中移動行 ),例如拖入三行JTable,將第一行拖到第二行,但在大多數情況下都可以正常工作盡管將例如第一行拖到第三行下方的底部會導致ArrayIndexOutOfBoundsException,並且該行消失。 該錯誤發生在以下行:getDataVector()。add(to,o);
使用“ 在JTable中移動行”中的以下代碼會發生此問題:
public class ReorderableTableModel extends DefaultTableModel implements Reorderable {
public void reorder(int from, int to) {
Object o = getDataVector().remove(from);
getDataVector().add(to, o);
fireTableDataChanged();
}
}
關於為什么它可能行不通的問題,Aaron似乎也有一個答案:盡管我不確定如何在我的方案中實現Aaron的答案,但在JTable中移動行 。
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)
我無法解決此問題,但是解決此問題的最佳方法是什么?
由於已從Vector
刪除了一個元素,因此應考慮將某些indexes
變為index-=1
;
public void reorder(int from, int to) {
Object o = getDataVector().remove(from);
getDataVector().add(from>to?to:to-1, o);
fireTableDataChanged();
}
檢查from
的索引是否大於to
的索引。 如果是這樣,則我們知道to
的索引沒有更改,如果沒有更改,請通過刪除索引中的一個來更改它。
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