Java SWT TreeViewer拖放：SWT异常小部件已释放

我有一个CTabFolder，里面有几个一次性标签，每个标签上都有一个TreeViewer。我希望每个观众都有一个拖拉支架。因此，我自然地使用了

TreeViewer#addDragSupport

方法。除了我关闭shell和SWT尝试处理所有小部件时，所有操作都按预期进行

出现的例外情况是：

org.eclipse.swt.SWTException: Widget is disposed
at org.eclipse.swt.SWT.error(Unknown Source)
at org.eclipse.swt.SWT.error(Unknown Source)
at org.eclipse.swt.SWT.error(Unknown Source)
at org.eclipse.swt.widgets.Widget.error(Unknown Source)
at org.eclipse.swt.widgets.Widget.checkWidget(Unknown Source)
at org.eclipse.swt.widgets.Widget.removeListener(Unknown Source)
at org.eclipse.swt.dnd.DragSource.onDispose(Unknown Source)
at org.eclipse.swt.dnd.DragSource.access$1(Unknown Source)
at org.eclipse.swt.dnd.DragSource$2.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Widget.dispose(Unknown Source)
at org.eclipse.swt.dnd.DragSource$1.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Widget.dispose(Unknown Source)
at org.eclipse.jface.viewers.ContentViewer.handleDispose(ContentViewer.java:172)
at org.eclipse.jface.viewers.StructuredViewer.handleDispose(StructuredViewer.java:2328)
at org.eclipse.jface.viewers.ContentViewer$2.widgetDisposed(ContentViewer.java:214)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Widget.dispose(Unknown Source)
at org.eclipse.jface.viewers.ContentViewer.handleDispose(ContentViewer.java:172)
at org.eclipse.jface.viewers.StructuredViewer.handleDispose(StructuredViewer.java:2328)
at org.eclipse.jface.viewers.ContentViewer$2.widgetDisposed(ContentViewer.java:214)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Widget.dispose(Unknown Source)
at org.eclipse.jface.viewers.ContentViewer.handleDispose(ContentViewer.java:172)
at org.eclipse.jface.viewers.StructuredViewer.handleDispose(StructuredViewer.java:2328)
at org.eclipse.jface.viewers.ContentViewer$2.widgetDisposed(ContentViewer.java:214)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Widget.dispose(Unknown Source)
at org.eclipse.jface.viewers.ContentViewer.handleDispose(ContentViewer.java:172)
at org.eclipse.jface.viewers.StructuredViewer.handleDispose(StructuredViewer.java:2328)
at org.eclipse.jface.viewers.ContentViewer$2.widgetDisposed(ContentViewer.java:214)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Composite.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Canvas.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Decorations.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Shell.releaseChildren(Unknown Source)
at org.eclipse.swt.widgets.Widget.release(Unknown Source)
at org.eclipse.swt.widgets.Widget.dispose(Unknown Source)
at org.eclipse.swt.widgets.Decorations.dispose(Unknown Source)
at org.eclipse.swt.widgets.Shell.dispose(Unknown Source)
at org.eclipse.jface.window.Window.close(Window.java:335)
at org.eclipse.jface.window.ApplicationWindow.close(ApplicationWindow.java:307)
at org.eclipse.jface.window.Window.handleShellCloseEvent(Window.java:741)
at org.eclipse.jface.window.Window$3.shellClosed(Window.java:687)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Decorations.closeWidget(Unknown Source)
at org.eclipse.swt.widgets.Decorations.WM_CLOSE(Unknown Source)
at org.eclipse.swt.widgets.Control.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Canvas.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Decorations.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Shell.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Display.windowProc(Unknown Source)
at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.DefWindowProc(Unknown Source)
at org.eclipse.swt.widgets.Shell.callWindowProc(Unknown Source)
at org.eclipse.swt.widgets.Control.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Canvas.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Decorations.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Shell.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Display.windowProc(Unknown Source)
at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.DefWindowProc(Unknown Source)
at org.eclipse.swt.widgets.Shell.callWindowProc(Unknown Source)
at org.eclipse.swt.widgets.Control.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Canvas.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Decorations.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Shell.windowProc(Unknown Source)
at org.eclipse.swt.widgets.Display.windowProc(Unknown Source)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
at org.eclipse.jface.window.Window.open(Window.java:801)

这似乎有点广泛。似乎SWT试图在处理完后从树上移除DragListener。我真的不明白这怎么可能

我不认为我在实现源/目标和传输类型时犯了错误，因为拖放就像一个符咒

当将一次性拖动添加到一个包含在一次性控件中的TeeVIEWER中时，可能会考虑到任何陷阱吗？

---

如果您需要代码示例，请告诉我。

这应该不是问题。您有两种选择：编写一段代码，给出错误信息，或者只需在文件夹上添加dispose listener事件，然后删除其中的拖动支持