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Using Filterator and RowHideShowLayer together [message #1196452]

Tue, 19 November 2013 12:26

Pradyumna Bhide

Messages: 18
Registered: August 2013

Junior Member

Hello experts,

I am using NatTable since i have to render a large data set.
I need to support a couple of features which seem to be mutually conflicting from implementation perspective.
1. I have to provide a text box which should help users filter rows in the Nattable. I successfully implmented this by creating a "Filterator".
2. I also need to provide a checkbox which will be responsible for hiding/showing some rows from the table. I have implemented this with the help of RowHideShowLayer. Whenever I need to hide rows, I loop through the entire data set and identify the positions of row that need to be hidden and provide these to the "hideRowPositions" method the RowHideShowLayer. This works fine except in case when i sort the data when rows are hidden. I am not sure of the appropriate way to tackle this but I plan to handle this by adding an event listener that will hide rows based on the resultant positions.

Both these features work as expected in isolation. However when clubbed, the latter works as expected (with the glitch mentioned above) but the former doesn't. In the first case whenever I type anything in the filter text box all rows are hidden instead of those not matching the text in the filter textbox.
If I stop hiding rows using "RowHideShowLayer" this issue disappers.
I don't have any clue how to handle this.
Please help.

Thanks and regards,
Pradyumna

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Re: Using Filterator and RowHideShowLayer together [message #1196490 is a reply to message #1196452]

Tue, 19 November 2013 12:48

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

Are you using GlazedLists for filtering? Do you use the FilterRow?

The issue is that the RowHideShowLayer is doing a transformation on what it sees. The FilterList from GlazedLists also performs a transformation on the content. Doing the transformation with the FilterList will give the RowHideShowLayer an already transformed state that does not match the state you are requesting.

We had a similar request and created the DetailGlazedListsEventLayer that directly transforms all ListChange events from GlazedLists to the NatTable layer stack. This way in NatTable those transformations can be handled. But you need to use the GlazedListsRowHideShowLayer in conjunction, as this is the row hide/show layer that works in combination with the FilterList.

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Re: Using Filterator and RowHideShowLayer together [message #1196516 is a reply to message #1196490]

Tue, 19 November 2013 13:03

Pradyumna Bhide

Messages: 18
Registered: August 2013

Junior Member

Thanks Dirk for the quick reply.
I am using GlazedLists.FilterList for filtering in the first case - i think that is what you meant by "GlazedLists for filtering".
I am not using the FilterRow.
Unfortunately the NatTable jar that we are using doesn't include GlazedListsEventLayer. Is there an alternate way to do this?
Also, is there a better solution than the one i had mentioned earlier to keep rows hidden even after they are sorted?

Regards,
Pradyumna

[Updated on: Tue, 19 November 2013 13:10]

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Re: Using Filterator and RowHideShowLayer together [message #1196526 is a reply to message #1196516]

Tue, 19 November 2013 13:09

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

Quote:

the NatTable jar that we are using

You are using a JAR and not the update site? Which version of NatTable are you using?
And of course the GlazedListsEventLayer is not part of the NatTable jar, or not, not sure what you mean in fact. There is a NatTable Core, the NatTable GlazedLists Extension and the NatTable POI Extension. What are you using?

As long as you are operating on index/position rather than id's there will be issues with that kind of use cases. With the DetailGlazedListsEventLayer and the other layers I mentioned above we tried to provide a suitable workaround. For example, if you are also sorting using the SortedList from GlazedLists, you would receive the change event and the transformation would be performed automatically.

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Re: Using Filterator and RowHideShowLayer together [message #1196543 is a reply to message #1196526]

Tue, 19 November 2013 13:16

Pradyumna Bhide

Messages: 18
Registered: August 2013

Junior Member

Yes we are using jars and i guess these are pretty old ones - "net.sourceforge.nattable..." ones. I expect that class to be in the glazedlists extension.
So if i understand it right i have to upgrade to the latest jars to get a fix for this case.
I will talk to our administrators and see if we can do so.

Thanks for your help.

Regards,
Pradyumna

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