Java 获得；SWTException:Widget已处理；尝试删除拖放侦听器时

我在Eclipse中创建了一个自定义视图，它实现了一个部件侦听器

public class CodeBuilderView extends ViewPart implements IPartListener

我正在为视图添加拖放支持。为了删除拖放侦听器，我重写了dispose（）方法，如下所示

@Override
public void dispose()
{
    getSite().getPage().removePartListener(this);

    if(viewDragSource!=null && viewDragSourceAdapter!=null)
        viewDragSource.removeDragListener(viewDragSourceAdapter);
    if(viewDropTarget!=null && viewDropTargetAdapter!=null)
        viewDropTarget.removeDropListener(viewDropTargetAdapter);

    super.dispose();
}

但是，我在“viewDragSource.removeDragListener（viewDragSourceAdapter）；”行上遇到了一个SWT异常。我认为在处理视图之前有必要先处理好听众，这正是我正在做的。任何帮助都将不胜感激

如下：

org.eclipse.swt.SWTException: Widget is disposed
at org.eclipse.swt.SWT.error(SWT.java:4441)
at org.eclipse.swt.SWT.error(SWT.java:4356)
at org.eclipse.swt.SWT.error(SWT.java:4327)
at org.eclipse.swt.widgets.Widget.error(Widget.java:476)
at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:348)
at org.eclipse.swt.widgets.Widget.removeListener(Widget.java:962)
at org.eclipse.swt.dnd.DragSource.removeDragListener(DragSource.java:685)
at codebuilder.views.CodeBuilderView.dispose(CodeBuilderView.java:472)
at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.invalidate(CompatibilityPart.java:224)
at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.destroy(CompatibilityPart.java:373)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)
at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:888)
at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:869)
at org.eclipse.e4.core.internal.di.InjectorImpl.uninject(InjectorImpl.java:180)
at org.eclipse.e4.core.internal.di.Requestor.uninject(Requestor.java:158)
at org.eclipse.e4.core.internal.contexts.ContextObjectSupplier$ContextInjectionListener.update(ContextObjectSupplier.java:82)
at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:107)
at org.eclipse.e4.core.internal.contexts.EclipseContext.removeListenersTo(EclipseContext.java:464)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.uninject(ContextInjectionFactory.java:144)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:942)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$3(PartRenderingEngine.java:862)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$8.run(PartRenderingEngine.java:857)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:841)
at org.eclipse.e4.ui.workbench.renderers.swt.ElementReferenceRenderer.disposeWidget(ElementReferenceRenderer.java:118)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:933)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$3(PartRenderingEngine.java:862)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$8.run(PartRenderingEngine.java:857)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:841)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:894)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$3(PartRenderingEngine.java:862)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$8.run(PartRenderingEngine.java:857)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:841)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:894)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$3(PartRenderingEngine.java:862)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$8.run(PartRenderingEngine.java:857)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:841)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:894)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$3(PartRenderingEngine.java:862)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$8.run(PartRenderingEngine.java:857)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:841)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:894)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$3(PartRenderingEngine.java:862)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$8.run(PartRenderingEngine.java:857)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:841)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:887)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$3(PartRenderingEngine.java:862)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$8.run(PartRenderingEngine.java:857)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:841)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:894)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$3(PartRenderingEngine.java:862)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$8.run(PartRenderingEngine.java:857)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:841)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:894)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$3(PartRenderingEngine.java:862)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$8.run(PartRenderingEngine.java:857)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:841)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:894)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$3(PartRenderingEngine.java:862)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$8.run(PartRenderingEngine.java:857)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:841)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:894)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$3(PartRenderingEngine.java:862)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$8.run(PartRenderingEngine.java:857)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:841)
at org.eclipse.ui.internal.WorkbenchWindow.hardClose(WorkbenchWindow.java:1924)
at org.eclipse.ui.internal.WorkbenchWindow.busyClose(WorkbenchWindow.java:1547)
at org.eclipse.ui.internal.WorkbenchWindow.access$15(WorkbenchWindow.java:1514)
at org.eclipse.ui.internal.WorkbenchWindow$10.run(WorkbenchWindow.java:1579)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.WorkbenchWindow.close(WorkbenchWindow.java:1576)
at org.eclipse.ui.internal.Workbench$14.run(Workbench.java:1155)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.ui.internal.Workbench.busyClose(Workbench.java:1137)
at org.eclipse.ui.internal.Workbench.access$21(Workbench.java:1079)
at org.eclipse.ui.internal.Workbench$19.run(Workbench.java:1410)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.Workbench.close(Workbench.java:1407)
at org.eclipse.ui.internal.Workbench.close(Workbench.java:1380)
at org.eclipse.ui.internal.WorkbenchWindow.busyClose(WorkbenchWindow.java:1543)
at org.eclipse.ui.internal.WorkbenchWindow.access$15(WorkbenchWindow.java:1514)
at org.eclipse.ui.internal.WorkbenchWindow$10.run(WorkbenchWindow.java:1579)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.WorkbenchWindow.close(WorkbenchWindow.java:1576)
at org.eclipse.ui.internal.WorkbenchWindow.close(WorkbenchWindow.java:1590)
at org.eclipse.ui.internal.WorkbenchWindow$6.close(WorkbenchWindow.java:520)
at org.eclipse.e4.ui.workbench.renderers.swt.WBWRenderer$11.shellClosed(WBWRenderer.java:564)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:98)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4353)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1061)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1085)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1070)
at org.eclipse.swt.widgets.Decorations.closeWidget(Decorations.java:308)
at org.eclipse.swt.widgets.Decorations.WM_CLOSE(Decorations.java:1696)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4612)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:339)
at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1626)
at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2075)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5023)
at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544)
at org.eclipse.swt.widgets.Shell.callWindowProc(Shell.java:498)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4705)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:339)
at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1626)
at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2075)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5023)
at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544)
at org.eclipse.swt.widgets.Shell.callWindowProc(Shell.java:498)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4705)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:339)
at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1626)
at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2075)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5023)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2549)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1151)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1032)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:148)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:636)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:579)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:135)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:382)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:236)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:648)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
at org.eclipse.equinox.launcher.Main.main(Main.java:1438)

---

viewDragSource

已由SWT处理，因此您无法对其执行更多操作。由于它已被释放，侦听器列表已被清除

您可以使用以下方法对此进行测试：

if (viewDragSource != null && !viewDragSource.isDisposed()) {
    ... viewDragSource is safe to use ....
}

---

所以我不需要手动删除侦听器？eclipse会自动完成这项工作吗？在这种情况下，我可以删除这些语句来删除听众吗？谢谢您的帮助。出于好奇，我们如何确定何时应该手动处理侦听器以及eclipse何时隐式处理侦听器？通常，SWT小部件所在的窗口关闭时会自动处理（大多数SWT对象都是从小部件派生的）