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Row spanning not working when table is scrolled [message #1829228]

Mon, 29 June 2020 08:50

Shreya Suman

Messages: 13
Registered: March 2017

Junior Member

Hello,

in one of my nattable , i have implemented row spanning by overridding the getCellByPosition method of GlazedListDataprovider. it works fine but only when i am scrolling the table rows and if first row of the spanned rows moves out of the visible table area, the spanning does not work and instead it displays as individual rows.

please see attached document for the images.

Can anyone help me how to configure my table such that spanning for rows always work correctly.

Attachment: Row_SPan_issue.docx
(Size: 89.40KB, Downloaded 65 times)

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Re: Row spanning not working when table is scrolled [message #1829232 is a reply to message #1829228]

Mon, 29 June 2020 10:37

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

Then your implementation of getCellByPosition() is incorrect! BTW, the deprecated GlazedListsDataProvider does not specify the getCellByPosition() method, as it does not implement the ISpanningDataProvider interface. Not sure about which classses you are talking about.

Typically the issue is that you either put the layers incorrectly together which causes a index-position-transformation that should not happen on the DataLayer, or you missed to check for the correct starting row of your spanning on scrolling.

By giving me that little information (and probably incorrect information) I am unable to help.

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Re: Row spanning not working when table is scrolled [message #1830044 is a reply to message #1829232]

Thu, 16 July 2020 08:46

Shreya Suman

Messages: 13
Registered: March 2017

Junior Member

Hello Dirk,

i have a custom Glazed list data provider (MyGlazedListDataProvider) that extends GlazedListDataProvider and implements ISpanningDataProvider
My Body Data layer is an instance of SpanningDataLayer.

i have done casting for body data provider when i instatiate bodydatalayer as shown below.
bodyDataProvider = MyGlazedListDataProvider(...);
bodyDataLayer = new SpanningDataLayer((ISpanningDataProvider)bodyDataProvider);

since my MyGlazedListDataProvider implements ISpanningDataProvider, i was able to override its getCellByPosition method.

Can you tell me where i am going wrong and what is the correct way to achieve row spanning without facing the issue while scrolling.

Thanks

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Re: Row spanning not working when table is scrolled [message #1830048 is a reply to message #1830044]

Thu, 16 July 2020 09:42

Dirk Fauth

Messages: 47
Registered: March 2020

Member

How should I be able to tell you what you are doing wrong without seeing the code that you used to calculate the spanning? From my experience people are doing things wrong in this method for identifying the origin row position and the spanning. But hard to tell if you made such a mistake or anything else is wrong.

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