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Nattable row position after scrolling [message #1780162]

Thu, 18 January 2018 09:55

Panisha RN

Messages: 43
Registered: May 2013

Member

I have implemented DND support in my Nattable implementation.

Upon drop i try to get the row position using API below.

Point pt = dropTargetevent.display.map(null, getTable(), dropTargetevent.x, dropTargetevent.y);
int position = getTable().getRowPositionByY(pt.y);
return position;

It works fine as long as i am not scrolling.

However after i scroll few rows, this functions does not seems to give correct row position..Looks like it consider only visible rows to the user , all the row which gets hidden after scrolling are gettting ignored.

Eg: if i have 100 rows, after scrolling 5 rows up if i try to get the row position of the 5th row which is first visible row in the table after scrolling , i get 1 instead of 5..

I think, i am missing something.

Can some one help me.

Thanks in advance.

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Re: Nattable row position after scrolling [message #1780163 is a reply to message #1780162]

Thu, 18 January 2018 09:58

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

Yes you are missing a basic concept in NatTable - index-position-transformation. You expect that the method returns you the INDEX in the collection, but it returns you the POSITION in the table. And since you are using the ViewportLayer, this means the position of the visible rows in the table.

You need to get the row index by position. If you search for this topic I suppose you will find several results.

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