0.99.7: Fullscreen previous/next image selection is sluggish

[bsolar]

XnView: MP 0.99.7 - 64 bit
OS: Mac 64bit

In Fullscreen, scrolling with the mouse wheel or pressing the arrow buttons moves to the previous/next image. When doing it slowly enough, every mouse wheel "click"/button press correctly changes the selected image, but when trying to faster the file selection at some point stop advancing. I assume the application waits to complete the rendering of the image before accepting the next event or something.

Effect: Attempting to quickly move through images in fullscreen causes the selected image not to change as expected.

To reproduce:
1. Open XnView MP in a directory with multiple images.
2. Go in Fullscreen mode on one of the images.
3. Attempt to scroll quickly to previous or next images, or move quickly through images by quicly pressing an arrow button.
Actual behaviour (bug): The selected image does not always change.

Expected behaviour: Files are advanced according to the amount of "clicks" from the scroll wheel/arrow button presses.

[helmut]

Thank you for your good problem report, bsolar. I've just tried to reproduce your problem but with little success: Navigation / scrolling through images works very quickly and without delay and without stop advancing. What I noticed, though, that when scrolling fast using the mouse wheel you have to use the wheel many times to navigate from first to last image while when scrolling slowly every wheel click will navigate to the next image.

I suspect that stop advancing is because images cannot be loaded fast enough. Are both settings "Read one image ahead" and "Two pass rendering at loading" activated? You'll find these settings in Tools > Settings | Category "View" | Tab "Misc". Does your Mac have a HDD or a SDD? Do other people on Mac experience this problem?

My platform:
XnView MP 0.99.7 - 64bit
OS: Windows 10

[uksamo]

Hi Folks, I have a very similar issue with my new M1 Mac. On my previous Windows PC 1 click of the scroll wheel would advance 1 image when viewed in both the viewer and full screen. On my Mac it doesn't seem to matter how many click I scroll my wheel, I seem to only be able to advance by approximately 1 images per 1-2 seconds. If I scroll very slowly, approximately 1 click per second I normally advance to the next image each click, though approx 1 in 6 clicks still get missed.

I don't believe it's directly related to the rendering/loading of the next image as I can zoom through the whole album using my arrow keys, and no matter how fast I tap the arrow key, the next image is already visible with no obvious loading wait time. I'm using a new MacBook Pro with a Logitech M720 mouse. I've tried with and without the Logitech software installed and that makes no difference. For now I'll use the arrow keys as the mouse wheel doesn't feel usable or reliable at the speed it scrolls, especially when quickly trying to scan through an album.

Any fixes to improve mouse wheel scrolling would be very appreciated. Please let me know if there's any other debugging or information I could provide that may help. Thanks.

[xnview]

yes a known issue, the mouse wheel has a high precision. Is it possible to send you a test version?

[Kenny Dave]

Any news on this? I'm still jumping several images using the mousewheel in full screen. I'm in Ubuntu 22.04 and XNViewMP 1.5.5 64bit.

Could we maybe have an adjuster in settings if it's about sensitivity? I don't think it is about sensitivity though; sometimes it doesn't move at all, then it will jump the 5 images or whatever.

I can turn down the wheel sensitivity for the system, and have too slow a scroll in firefox etc. But it still won't consistently move one image in XNView. It does the same thing, but slower: no move, then jumps a few if I keep turning the wheel.

It wasn't always thus, 3 or so versions ago I think it was ok. I can try rolling back and see if my memory is correct.

Edit: it turns out that this is a mouse driver issue, which I've sorted in a way that XNView doesn't see. It can therefore be ignored as an issue in XNView.

[DickerKoenig]

Same to me. (MacBook, MacOS Sonoma 14.1).
Especially scrolling the thumbs ist far too fast with trackpad and with mouse.
This is my one and only problem with XnView!

[uksamo]

Did anyone find a solution for this issue? I've come back to a Mac a few years after returning my previous MacBook and noticed this is still an issue. If I mouse wheel slowly, it'll move through 1 picture per click of my wheel, but if I spin the wheel quickly, i.e. 5 clicks, it'll still only scroll to the next picture instead of jumping ahead by 5 pictures. I don't have this issue in other app such as Lightroom, it scrolls through the images super fast, so I don't think it's a driver or mouse issue in general. It would be great if there was a fix or setting I could change to fix this here. Thanks

[xnview]

Did anyone find a solution for this issue? I've come back to a Mac a few years after returning my previous MacBook and noticed this is still an issue. If I mouse wheel slowly, it'll move through 1 picture per click of my wheel, but if I spin the wheel quickly, i.e. 5 clicks, it'll still only scroll to the next picture instead of jumping ahead by 5 pictures. I don't have this issue in other app such as Lightroom, it scrolls through the images super fast, so I don't think it's a driver or mouse issue in general. It would be great if there was a fix or setting I could change to fix this here. Thanks

which mouse do you have?

[Kenny Dave]

I have a Logitech G903, linux Mint. XNView MP 1.7.1 (Linux) - Libformat 7.176

I have the issue outstanding; it's fine in every program apart from XNView.

The issue has returned and I can't remember how I fixed it. I remember something about high definition mouse driver, but I can't find anything. The issue reappeared either on updating XNView, or I also updated the kernel recently so it could be that. Plugging the charging cable into the mouse resolves the issue, and changes how the mouse behaves in XNView.

Any guidance is greatly appreciated, even if it isn't technically an XNView issue I don't think. But everything else manages it in a way that works.

Edit: I seem to have a resolution, which is to turn off the HID scrolling for my mouse. The issue is dependent on the linux kernel version, which has added in HID scrolling for my Logitech G903. Every program that I have other than XNView works ok, but it seems there are others that struggle also.

The solution is to disable HID scrolling, as per this post.

More discussion of the issue here.