Unanswered: Event for DataItem becoming visible on the screen? (or: loading thousands of images)
I have a dataview with a few thousand items. I don't want to render them all in advance, but only the first time they become visible on the screen.
I've tried adding a listener to the show event, which didn't work, and I also tried the painted event, which seems to trigger for all items when the dataview is created.
What's the best way to do this? The items are images, so I am basically trying to avoid doing all of the network requests in advance as this hangs the UI for several seconds.
EDIT: clarification -- I do want them all to be rendered normally, I would simply not set the img src until the item is displayed on the screen
Just found out about dataview paging... that seems to be the best option.
Now looking to find a solid example on implementing it... my main problem with this will be how to implement a dataview page that will nicely fill the screen on phones with various resolutions when we're displaying a dataview of image thumbnails...