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ViewerRefresh delay break setting selection [message #1797285]

Mon, 29 October 2018 14:21

Rolf Theunissen

Messages: 64
Registered: April 2012

Member

In a editor, for the selectionViewer I use the AdapterFactoryContentProvider as a content provider.
I am (asynchronously) loading a resource in the editingdomain resourceset, after the editor has opened. When the resource is loaded, I set the selection on the treeviewer to the newly created resource. In EMF <2.14 this worked fine.
However, in EMF 2.14 this no longer works correctly. The new ViewerRefresh delays the refresh of the tree-viewer, as a result, the selection is set before the new tree is displayed. And setting the selection fails.

Is there a way to set the selection after the viewer is refreshed?

Best Regards,
Rolf

[Updated on: Mon, 29 October 2018 14:26]

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Re: ViewerRefresh delay break setting selection [message #1797299 is a reply to message #1797285]

Mon, 29 October 2018 15:54

Ed Merks

Messages: 30688
Registered: July 2009

Senior Member

ViewerRefresh is very old and has always been delayed. The only new thing is org.eclipse.emf.edit.ui.provider.AdapterFactoryContentProvider.ViewerRefresh.ViewerRefresh(Viewer, int) with a threshold because a single refresh is faster than a large number of incremental updates. Does Display.asyncExec to set the selection help?

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Re: ViewerRefresh delay break setting selection [message #1797363 is a reply to message #1797299]

Tue, 30 October 2018 10:40

Rolf Theunissen

Messages: 64
Registered: April 2012

Member

Using Display.asyncExec does not help, still the selection is set before the (200ms) delay of the refresh. After looking some more in our code, we already did some tricks to delay all notification while loading the model, to reduce the number of updates (for performance reasons). When this code is disabled, the model is created a little more gradually, and the element to be selected is available before the selection is set. And the performance seems to be good too.

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Re: ViewerRefresh delay break setting selection [message #1797373 is a reply to message #1797363]

Tue, 30 October 2018 12:28

Ed Merks

Messages: 30688
Registered: July 2009

Senior Member

Note too that you can control the threshold and delay via org.eclipse.emf.edit.ui.provider.AdapterFactoryContentProvider.getViewerRefreshTheshold() and org.eclipse.emf.edit.ui.provider.AdapterFactoryContentProvider.getViewerRefreshDelay().

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