QListWidget with dynamic icons

SGaist · wrote on 31 Mar 2016, 19:19

Hi,

What about delegating the icon load to anther thread and then signal a data change when they are ready ?

Harry123 · wrote on 31 Mar 2016, 19:43

I would really prefer to avoid creating icons that will never be looked at, if possible.
I might find myself creating 1000 icons, while the user will never look at more than the first few screens.

SGaist · 1 Apr 2016, 11:50

Sorry, I just saw that my suggestion is incomplete. Your model should be queried when needed for the icons so what I was suggesting is that when one is queried, you start loading it and then trigger the dataChanged signal.

Harry123 · wrote on 1 Apr 2016, 11:50

@SGaist

Could you please add more details about this procedure.
I never used model/view.

SGaist · 2 Apr 2016, 10:05

Which part would like to have more detail on ?

Harry123 · 4 Feb 2016, 10:06

@SGaist

I would prefer to use QListWidget, because it is much simpler than using model/view with which I have no experience.
I need some pointers as to what should be done - classes and functions to call.

I myself was thinking more in the direction of connecting to the vertical scrollbar of QListWidget and anticipating scrolls, but I'm not sure I would guess correctly from the scroll events exactly which items will be displayed.

SGaist · 4 Apr 2016, 10:45

If you use QListWidget then you don't have any control over the model so you won't be able to move the image loading part outside of it.

Harry123 · S SGaist 2 Apr 2016, 20:33

@SGaist

I have basically given up on using QListWidget that efficiently.

SGaist · 14 Apr 2016, 07:16

What option did you choose ?

Harry123 · S SGaist 4 Apr 2016, 19:40

@SGaist

I have divided the list into sections, and modified the UI to show only one section at a time.
This solved the performance problem (and maybe even made the UI more user-friendly).

SGaist · wrote on 14 Apr 2016, 09:48

It's good when it's more friendly :)