Loading a LONG list with images

[Mark Waddingham]

On 2022-02-21 23:47, Tom Glod via use-livecode wrote:
> This is how i did it .....  I hope this helps.
> 
> First to use the "numberofrecords" way of setting the datagrid data.
> This is key, that way you only ever trigger loading of visible rows.

So I've not got much to add to Tom's method

i.e. make sure the datagrid is only creating rows on demand, rather than 
up front, and then requesting images and updating them when they arrive

Beyond a suggestion to ensure the images which are being downloaded are 
already suitably sized/thumbnailed for display.

Decompressing images is a relatively expensive operation - decompressing 
and then downsizing them (thumbnailing) even more so.

So, if you control the webservice that is providing the images it would 
probably be worth making it so that the server can send you images at 
the size needed and do the thumbnailing on the server (caching the 
results alongside the original image on the server).

For maximum fidelity you want the width/height * the device pixel scale 
(which can vary from 1 to 3 these days).

Warmest Regards,

Mark.

-- 
Mark Waddingham ~ mark at livecode.com ~ http://www.livecode.com/
LiveCode: Everyone can create apps