org.eclipse.swt.SWTException：“Widget被释放”从表刷新 [英] org.eclipse.swt.SWTException: "Widget is disposed" from table refresh

问题描述

该应用程序是在Windows 7上运行的基于Eclipse 3.6的RCP（所以jface版本3.5.2）。

The app is an Eclipse 3.6 based RCP (so jface version 3.5.2) running on windows 7.

我有一个包含<$的自定义View类c $ c> TableViewer 并在其上调用 refresh（）。有时，但不是经常导致下面的堆栈跟踪。它是从UI线程中调用的。我怀疑问题是其他代码将支持列表更改为表，但执行此操作的任何代码也在syncExec或asyncExec方法中运行，所以我不明白它是如何在更改之间的同步问题表项和刷新查看器。

I have a custom View class that contains a TableViewer and calls refresh() on it. Sometimes, but not very often it results in the stack trace below. It's called from within the UI thread. I suspected the problem was with other code that changes the backing list to the table, but that any code that does this is also run in either a syncExec or asyncExec method so I don't understand how it could be a synchronisation issue between the changing of table items and the refresh of the viewer.

我有什么想法可以防止这种情况发生？

Any ideas what i can do to prevent this happening?

!ENTRY org.eclipse.jface 4 2 2010-10-20 09:22:06.140 !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface". !STACK 0 org.eclipse.swt.SWTException: Widget is disposed 
at org.eclipse.swt.SWT.error(SWT.java:3884) at org.eclipse.swt.SWT.error(SWT.java:3799) 
at org.eclipse.swt.SWT.error(SWT.java:3770) at org.eclipse.swt.widgets.Widget.error(Widget.java:463) 
at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:336) 
at org.eclipse.swt.widgets.Widget.getData(Widget.java:521) 
at org.eclipse.jface.viewers.AbstractTableViewer.setSelectionToWidget(AbstractTableViewer.java:921) 
at org.eclipse.jface.viewers.StructuredViewer.setSelectionToWidget(StructuredViewer.java:1711) 
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1399) 
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1353) 
at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1455) 
at org.eclipse.jface.viewers.ColumnViewer.refresh(ColumnViewer.java:537) 
at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1414)
... 
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:179)

推荐答案

似乎在查看器被处理（关闭？）之后调用了refresh（）方法。您可以通过检查来避免此异常：

Seems like refresh() method is called after the viewer is disposed (closed?). You can avoid this exception by checking:

public void refresh() {
   if (viewer != null && !viewer.getControl().isDisposed()) {
      // Actual refresh code
   }
}

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