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D&D in TextEditor [message #867364]

Tue, 01 May 2012 08:53

Mauro Condarelli

Messages: 428
Registered: September 2009

Senior Member

Is TextEditor supposed to support D&D without further customization?
I do get the following error:

!ENTRY org.eclipse.ui 4 0 2012-05-01 10:33:50.865
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.NullPointerException
at org.eclipse.ui.internal.EditorSiteDragAndDropServiceImpl$1.dragLeave(EditorSiteDragAndDropServiceImpl.java:107)
at org.eclipse.swt.dnd.DNDListener.handleEvent(DNDListener.java:70)
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.Widget.sendEvent(Widget.java:1077)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:774)
at org.eclipse.swt.dnd.DropTarget.Drop(DropTarget.java:403)
at org.eclipse.swt.dnd.DropTarget$3.method6(DropTarget.java:258)
at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:119)
at org.eclipse.swt.internal.ole.win32.COM.DoDragDrop(Native Method)
at org.eclipse.swt.dnd.DragSource.drag(DragSource.java:363)
at org.eclipse.swt.dnd.DragSource.access$0(DragSource.java:289)
at org.eclipse.swt.dnd.DragSource$1.handleEvent(DragSource.java:172)
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:4165)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at it.condarelli.writer.Writer.start(Writer.java:42)
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:344)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
at org.eclipse.equinox.launcher.Main.main(Main.java:1386)

I also traced the call to initializeDragAndDrop(getSourceViewer());, but
Platform.getAdapterManager().loadAdapter(this, "org.eclipse.ui.texteditor.ITextEditorDropTargetListener");
returns null.
It seems to install correctly installTextDragAndDrop(viewer).

but it doesn't work because in the DropTargetEvent data, dataTypes and currentDataType are all null.
Get ApprporiateListener() tries to return secondaryListener, but that is also null.

What do I miss?

TiA
Mauro

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Re: D&D in TextEditor [message #868991 is a reply to message #867364]

Wed, 02 May 2012 20:24

Mauro Condarelli

Messages: 428
Registered: September 2009

Senior Member

On 01/05/2012 10:53, Mauro Condarelli wrote:
> Is TextEditor supposed to support D&D without further customization?
> I do get the following error:
>
> !ENTRY org.eclipse.ui 4 0 2012-05-01 10:33:50.865
> !MESSAGE Unhandled event loop exception
> !STACK 0
> java.lang.NullPointerException
> at org.eclipse.ui.internal.EditorSiteDragAndDropServiceImpl$1.dragLeave(EditorSiteDragAndDropServiceImpl.java:107)
> at org.eclipse.swt.dnd.DNDListener.handleEvent(DNDListener.java:70)

I seem to have hit the same misbehavior described in:
http://www.eclipse.org/forums/index.php/m/333816/3c7da5f6adf4288d241ba57a13d72a3d/#msg_333816

The workaround described there works for me.

Can someone suggest a "more proper" fix?
That one involves ignoring "restrictions" in the lib.

I was not able to find an associated bug; should I open one?

Regards
Mauro

> 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.Widget.sendEvent(Widget.java:1077)
> at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
> at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:774)
> at org.eclipse.swt.dnd.DropTarget.Drop(DropTarget.java:403)
> at org.eclipse.swt.dnd.DropTarget$3.method6(DropTarget.java:258)
> at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:119)
> at org.eclipse.swt.internal.ole.win32.COM.DoDragDrop(Native Method)
> at org.eclipse.swt.dnd.DragSource.drag(DragSource.java:363)
> at org.eclipse.swt.dnd.DragSource.access$0(DragSource.java:289)
> at org.eclipse.swt.dnd.DragSource$1.handleEvent(DragSource.java:172)
> 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:4165)
> at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
> at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
> at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
> at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
> at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
> at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
> at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
> at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
> at it.condarelli.writer.Writer.start(Writer.java:42)
> 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:344)
> at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
> at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
> at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
> at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
>
>
>
> I also traced the call to initializeDragAndDrop(getSourceViewer());, but
> Platform.getAdapterManager().loadAdapter(this, "org.eclipse.ui.texteditor.ITextEditorDropTargetListener");
> returns null.
> It seems to install correctly installTextDragAndDrop(viewer).
>
> but it doesn't work because in the DropTargetEvent data, dataTypes and currentDataType are all null.
> Get ApprporiateListener() tries to return secondaryListener, but that is also null.
>
> What do I miss?
>
> TiA
> Mauro

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