Question

I would like to be able to load more data into a listbox when I reach the begining or the end of the listbox.

My listbox shows items that are time related therefor when I reach the top and pull down I would like to see some text like “Scroll down more to retrieve more items” and if you do so it then triggers a data download for items that occur earlier.

Same thing for the bottom item if you scoll down far enough (beneath the last item it triggers a data download for items later than listed).

I’m not after a seamless listbox I want the data download to trigger only if I scroll upp or down far enough and release.
I hope this description makes sense.

Basically what I need to know is the exact scroll position in the Listbox and so that I can detemine when the list has been dragged and released far down or up.
For those who have IPhone the effect I’m after is used in the Facebook app.

Cheers

/Jimmy

Answer 1

You’re looking for two separate things. First, you need to change the default layout of the ListBox to have an ending control. A pretty decent implementation was presented here – you are basically inserting an extra control after the ItemPresenter in the default template.

Looking for dynamic loading, here is an implementation.