| SWTException: Widget is disposed in TableViewer with ObservableListContentProvider [message #1053219] |
Fri, 03 May 2013 04:12  |
Eclipse User |
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Hello,
I have placed two buttons for moving TableItems UP and DOWN besides a TableViewer, which has an ObservableListContentProvider and therefore has an IObservableList as input.
Here is the code for moving the items in the IObservableList
// The move action can be 1 or -1
public void moveSelected(List<IViewerItem> currentInput, int moveAction) {
// get selection
Collection<IViewerItem> selectedRows = getSelectedRows();
if (selectedRows == null) {
return;
}
// get range (indices) of selected items
int count = currentInput.size();
if (count == 0) {
return;
}
int minRowIndex = count - 1;
int maxRowIndex = 0;
for (IViewerItem item : selectedRows) {
int index = currentInput.indexOf(item);
if (index < minRowIndex) {
minRowIndex = index;
}
if (index > maxRowIndex) {
maxRowIndex = index;
}
}
// is move up allowed
if ((ListFormItem.ONE_POSITION_UP == moveAction) && (minRowIndex < 1)) {
return;
}
// is move down allowed?
if ((ListFormItem.ONE_POSITION_DOWN == moveAction)
&& (maxRowIndex >= (count - 1))) {
return;
}
// move items
if (currentInput instanceof IObservableList) {
Iterator<IViewerItem> iterator = selectedRows.iterator();
while (iterator.hasNext()) {
IViewerItem iViewerItem = (IViewerItem) iterator.next();
int currentIndex = currentInput.lastIndexOf(iViewerItem);
((IObservableList) currentInput).move(currentIndex,
currentIndex + moveAction);
viewer.setSelection(new StructuredSelection(iViewerItem));
}
}
}
Most of the time this works quite well, but sometimes, when moving the items the following Exception occurs:
org.eclipse.swt.SWTException: Widget is disposed
at org.eclipse.swt.SWT.error(SWT.java:4083)
at org.eclipse.swt.SWT.error(SWT.java:3998)
at org.eclipse.swt.SWT.error(SWT.java:3969)
at org.eclipse.swt.widgets.Widget.error(Widget.java:468)
at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:340)
at org.eclipse.swt.widgets.Widget.getData(Widget.java:525)
at org.eclipse.jface.viewers.StructuredViewer.disassociate(StructuredViewer.java:639)
at org.eclipse.jface.viewers.AbstractTableViewer.internalRemove(AbstractTableViewer.java:794)
at org.eclipse.jface.viewers.AbstractTableViewer.access$0(AbstractTableViewer.java:767)
at org.eclipse.jface.viewers.AbstractTableViewer$3.run(AbstractTableViewer.java:834)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1422)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1383)
at org.eclipse.jface.viewers.AbstractTableViewer.remove(AbstractTableViewer.java:832)
at org.eclipse.jface.viewers.TableViewer.remove(TableViewer.java:413)
at org.eclipse.jface.viewers.AbstractTableViewer.remove(AbstractTableViewer.java:856)
at org.eclipse.jface.internal.databinding.viewers.TableViewerUpdater.remove(TableViewerUpdater.java:36)
at org.eclipse.jface.databinding.viewers.ObservableListContentProvider$2.handleRemove(ObservableListContentProvider.java:124)
at org.eclipse.core.databinding.observable.list.ListDiff.accept(ListDiff.java:139)
at org.eclipse.jface.databinding.viewers.ObservableListContentProvider$Impl.handleListChange(ObservableListContentProvider.java:118)
at org.eclipse.core.databinding.observable.list.ListChangeEvent.dispatch(ListChangeEvent.java:61)
at org.eclipse.core.databinding.observable.ChangeManager.fireEvent(ChangeManager.java:119)
at org.eclipse.core.databinding.observable.list.DecoratingObservableList.fireListChange(DecoratingObservableList.java:59)
at org.eclipse.core.databinding.observable.list.DecoratingObservableList.handleListChange(DecoratingObservableList.java:97)
at org.eclipse.core.databinding.observable.list.DecoratingObservableList$1.handleListChange(DecoratingObservableList.java:71)
at org.eclipse.core.databinding.observable.list.ListChangeEvent.dispatch(ListChangeEvent.java:61)
at org.eclipse.core.databinding.observable.ChangeManager.fireEvent(ChangeManager.java:119)
at org.eclipse.core.databinding.observable.list.ObservableList.fireListChange(ObservableList.java:73)
at org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableList.access$1(DetailObservableList.java:1)
at org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableList$1.handleListChange(DetailObservableList.java:48)
at org.eclipse.core.databinding.observable.list.ListChangeEvent.dispatch(ListChangeEvent.java:61)
at org.eclipse.core.databinding.observable.ChangeManager.fireEvent(ChangeManager.java:119)
at org.eclipse.core.databinding.observable.list.DecoratingObservableList.fireListChange(DecoratingObservableList.java:59)
at org.eclipse.core.databinding.observable.list.DecoratingObservableList.handleListChange(DecoratingObservableList.java:97)
at org.eclipse.core.databinding.observable.list.DecoratingObservableList$1.handleListChange(DecoratingObservableList.java:71)
at org.eclipse.core.databinding.observable.list.ListChangeEvent.dispatch(ListChangeEvent.java:61)
at org.eclipse.core.databinding.observable.ChangeManager.fireEvent(ChangeManager.java:119)
at org.eclipse.core.databinding.observable.ChangeSupport.fireEvent(ChangeSupport.java:39)
at org.eclipse.core.databinding.observable.list.AbstractObservableList.fireListChange(AbstractObservableList.java:114)
at org.eclipse.core.internal.databinding.property.list.SimplePropertyObservableList.notifyIfChanged(SimplePropertyObservableList.java:567)
at org.eclipse.core.internal.databinding.property.list.SimplePropertyObservableList.updateList(SimplePropertyObservableList.java:182)
at org.eclipse.core.internal.databinding.property.list.SimplePropertyObservableList.set(SimplePropertyObservableList.java:428)
at org.eclipse.core.databinding.observable.list.DecoratingObservableList.set(DecoratingObservableList.java:192)
at org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableList.set(DetailObservableList.java:169)
at org.eclipse.core.databinding.observable.list.DecoratingObservableList.set(DecoratingObservableList.java:192)
at mypackage.SelectedViewerItemsListener.move(SelectedViewerItemsListener.java:173)
at mypackage.SelectedViewerItemsListener.moveSelected(SelectedViewerItemsListener.java:150)
at mypackage.MoveListItemListener.modifyListInput(MoveListItemListener.java:45)
at mypackage.AbstractModifyListInputListener.widgetSelected(AbstractModifyListInputListener.java:40)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:234)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
at org.eclipse.equinox.launcher.Main.main(Main.java:1384)
Does anyone have an idea how to solve this problem or can offer a workaround?
Best regards,
Simon
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