Windows Scrolling a Container

Targets Windows
1

I’m having a rough time scrolling a custom DesktopContainer in a window.
On Mac it’s perfect.
On Windows it has awful refresh artifacts that look like it’s stuttering the child-controls and in places over running the confines it should be in. Live scrolling makes it worse.

I don’t know if I’m just doing this in a really bad way or if there are just some settings I have to be mindful of.

I’ve tried using transparency on/off and it seems to make some difference, but not consistently.

Any help or simple examples would be very welcome.

2

If you can upload a sample project someone can review and give you ideas.

3

It’s a customer project with their IP.
I’m hoping someone can tell me their approach or show a simple example.
I guess I could make an example.

4

try if composited help on or off at cc, at least it was there in 2021.
2024 have this option also.
grafik

5

Windows graphics generally are awful compared to Mac. Not sure by but here’s what I use that helps quite a bit:

#If TargetWindows Then
Me.DoubleBuffer = True
Me.EraseBackground = False
#EndIf

I utilize this with every window, canvas, etc. The graphics end up being much better.

Try it…

6

Never seen this? What’s it do?

7

doesn’t look like DesktopWindows use erasebackground, composite, or double-buffer anymore.
Am I wrong?

It looks to me like Xojo itself uses these scrollable controls, unless it’s all in a canvas?

8

Windows UI performance since the switch from GDI+ to Direct2D has been poor.

From my own tests it appears that controls are being drawn multiple times. I logged this case with my findings:
https://tracker.xojo.com/xojoinc/xojo/-/issues/76798

We have a similar situation and we will probably have to switch from several canvas controls being scrolled to a single giant canvas.

9

Someone must be doing this successfully.

10

Well, that’s interesting. Just another reason not to upgrade to API2.0! :smiley:

At this point I have no idea.

11

this composite option was at container control.
in my case i had a kanban board with scrolling cards inside a cc row inside a cc board.
i not tested the behavior with current xojo, this project in 2024 get run time errors …