I'd like to alter a cell's data, but only when it enters "edit" mode. There are a lot of events I can use, onSelectionByProp seems close but it's firing too often to be useful. Let's say, for instance, that I want to add '*' to a cell that has a value that is invalid in some way, but only when that cell is about to be edited. OK, it's a silly example but it's easier to explain that than what I'm actually doing.
My current approach (haven't done it yet) is to find TD.current when a cell is double-clicked and then alter the text directly. Ideally I'd like to find a "retrieve data" event and alter what's coming back from that.
onEditBegin is a proposed event for future version.
See here for list of events