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Property Changes on EventList / EventLayer working for adding/removing list elements only [message #940113]

Thu, 11 October 2012 10:24

Michi Classen

Messages: 36
Registered: March 2012

Member

Using the event list to propate changes to the event layer works for adding/removing list elements only. Changing the content of a list element propates the changes correctly to the event list, but the content at the layer doesn't change. As soon as the NatTable view is focused by the user manually, the content changes will be made.

How do I change this behavior, that the changes are made as soon as the property change has been propagated?

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Re: Property Changes on EventList / EventLayer working for adding/removing list elements only [message #940127 is a reply to message #940113]

Thu, 11 October 2012 10:38

Dirk Fauth

Messages: 2459
Registered: July 2012

Senior Member

You need to register an ILayerListener to the GlazedListsEventLayer. In this you can do your property updates the way you like. The easiest and most expensive would be to do a simple NatTable.refresh() everytime a property changes. For smaller tables this should do the trick. You could also try to do some more specific update dependent on the PropertyUpdateEvent generated by the GlazedListsEventLayer on propertyChange(). E.g. find the corresponding column and row position and fire a CellVisualChangeEvent (like in UpdateDataCommandHandler).

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Re: Property Changes on EventList / EventLayer working for adding/removing list elements only [message #940131 is a reply to message #940127]

Thu, 11 October 2012 10:42

Dirk Fauth

Messages: 2459
Registered: July 2012

Senior Member

BTW the BlinkLayer is one of the layers that reacts on the PropertyUpdateEvents to highlight data in the table that was updated in the background.

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Re: Property Changes on EventList / EventLayer working for adding/removing list elements only [message #940135 is a reply to message #940127]

Thu, 11 October 2012 10:47

Michi Classen

Messages: 36
Registered: March 2012

Member

My first solution was to register the GlazedListsEventLayer as listener to the model. This works fine, if the content is changed, like expected. But in this case, the adding / removing list elements is not propagated. Maybe I have to use both solutions:
- to propagate the add/remove list elements events: using the event list and add/remove elements on it
- to propagate the content changes: using the underlying data model on which the GlazedListsEventlayer is listening

[Updated on: Thu, 11 October 2012 10:56]

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Re: Property Changes on EventList / EventLayer working for adding/removing list elements only [message #940182 is a reply to message #940135]

Thu, 11 October 2012 11:47

Dirk Fauth

Messages: 2459
Registered: July 2012

Senior Member

Hi,

sorry as I haven't used the automatic update feature yet, I missed something.

Yes, to add/remove elements from the list you should use the EventList. This way the events are fired by GlazedLists which are then handled by the GlazedListsEventLayer.
The GlazedListsEventLayer is itself a PropertyChangeListener. So you should add it to the model so the property changes can be handled by GlazedLists.

GlazedLists are of course only able to fire events regarding changes to the list, like adding and removing elements. It doesn't know about the elements it contains.
Only the model elements itself can tell the outside world that something has changed, so they need to be able to fire PropertyChangeEvents. The GlazedListsEventLayer as a PropertyChangeListener then needs to be added to the model elements so it gets informed about the property changes.
Looking at the architecture there from a distance, this is the only way to do it at the moment.

Have a look at BlinkingGlazedListExample. There you should find an example for what you are looking for.

Greez,
Dirk

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Re: Property Changes on EventList / EventLayer working for adding/removing list elements only [message #947872 is a reply to message #940182]

Wed, 17 October 2012 14:28

Michi Classen

Messages: 36
Registered: March 2012

Member

The BlinkLayer was a good idea! Thanks! Now it works.

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