| RE: [platform-swt-dev] lazy loading for table |
It seems that there is no direct way to know which lines are visible in a Table.
I found a trick, not yet implemented :-(
But you can try it.
It is possible to know which is the first visible line of your table: using getTopIndex() // I tested it
It is possible to estimate the number of visible line : getSize().x / getItemHeight() // not tested, try it
It is possible to know when the user scroll the table // getVerticalBar().addSelectionListener (inherited from Scrollable). // tested in WinXP
So.
1) Determine how many line your table has.
2) Create an empty TableItem for each line (Yes, it's a problem when you have a million items, but you can try the standard table lazy loading)
3) When the visible items change (spying event for resize + scrollbar + table made visible + I don't know what).
Compute which items are visible. Calculate their values (I suppose it's not quick, that's why
you don't want to do it until really visible). Set the value in the TableItem.
That's it (after two days of coding and testing?).
I would be pleased to know if it works or not.
Emmanuel Castro
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