Line Binding with table Cell issue

Question

Hello,
In my application I need to map data from one table to another table. please see snap from below link
http://www.pixhost.org/show/3449/12902612_column-linking.png
if you see the snap you will come to know that I have Map Name "Pankti" from Left Table to Name "Isabella" from right Table.
I have used my custom tableView Control.
I have Bind Line cordinates as below
line.startXProperty().bind(lefttb.widthProperty().add(lefttb.layoutXProperty()));
line.startYProperty().bind(lefttb.lastcell.getTableRow().layoutYProperty().add(lefttb.lastcell.getTableRow().heightProperty().add(lefttb.lastcell.getTableRow().heightProperty().add(-12))));
line.endXProperty().bind(righttb.layoutXProperty());
line.endYProperty().bind(righttb.lastcell.getTableRow().layoutYProperty().add(righttb.lastcell.getTableRow().heightProperty().add(righttb.lastcell.getTableRow().heightProperty().add( -12))));
Here lefftb = LeftTableView
righttb = RightTableView
lastcell is a selected cell of tableview
I have added these control in Group Container.
MyProblem is :
When I scroll in any tableview then the relationship between data are lost and Line had start showing wrong relationship.
in above example if i scrolled RightTableview then see the result from Below Links
http://www.pixhost.org/show/3800/12903076_column-map1.png
http://www.pixhost.org/show/3800/12903157_column-map2.png
http://www.pixhost.org/show/1297/12903283_column-map3.png
So what should i do so that my Line always show correct relationship??
Please download my sample code from
http://www.freefilehosting.net/columnmapsample
or
http://www.filefactory.com/file/4w3dpn0l27rj/n/ColumnMapSample.rar
Thank You,
Ronak

Answer 1

Hi Roank ,
I think your approach of mapping the table using TableCell is not correct because the tablecell is updated everytime you scroll,click and other events. Although I can't give you full guide but the algorithm must be something like this:
+ Use the index of table cell or item Object instead of using the tableCell.
+ The index of cell is get from cell.getIndex();
Implementation
+ If the mapping is to be done then you must first save the index of two table in a Map<integer,integer> .
+ Now update the line of mapping only if the index matches in the cellfactory (during update of the table cell).
  Otherwise the line x,y must be set to the last known x,y position of that tablerow indexI think this way the things goes correctly. One thing to remember that tablecell is always updated.
Thanks
Narayan