Created attachment 137823 [details] Screenshot of applet having a value between discrete points SUMMARY Possibly I have posted this bug report to the wrong product/component. Please let me know. The battery & brightness applet is able to change the brightness of the keyboard. My laptop has the ability to show 4 different brightness levels. So the slider has 4 discrete positions to set the brightness. Using the scroll wheel each 'click' will move to a level above or below. However, when scrolling using the trackpad using two fingers I am able to position the slider in between the discrete values. Note that the brightness of the keyboard only changes when the discrete points are passed. STEPS TO REPRODUCE 1. Open battery & brightness applet 2. Change the discrete value of the keyboard brightness by scrolling with a trackpad. OBSERVED RESULT It's possible to reach values in between the possible discrete values of the slider. EXPECTED RESULT Only discrete values should be reachable. SOFTWARE/OS VERSIONS Operating System: Kubuntu 21.04 KDE Plasma Version: 5.21.4 KDE Frameworks Version: 5.80.0 Qt Version: 5.15.2 Kernel Version: 5.11.0-16-generic OS Type: 64-bit Graphics Platform: X11 Processors: 8 × Intel® Core™ i7-4700HQ CPU @ 2.40GHz Memory: 5,7 GiB of RAM Graphics Processor: Mesa DRI Intel® HD Graphics 4600 ADDITIONAL INFORMATION N/a
Can reproduce. Looks like a bug in how PlasmaComponents3.Slider handles high-resolution scrolling in discrete mode.
After investigation, it appears that this is a bug in the scroll behavior of the basic Qt Slider component itself. There is nothing we can do to work around it, sadly. Can you please report this upstream at https://bugreports.qt.io/? Thanks!
You can supply them with this as a testcase: ``` import QtQuick 2.6 import QtQuick.Controls 2.15 as QQC2 Item { implicitWidth: 500 implicitHeight: 300 QQC2.Slider { wheelEnabled: true snapMode: Slider.SnapAlways anchors.centerIn: parent from: 1 stepSize: 1 to: 10 } } Just position the cursor over the slider and scroll with a touchpad. The handle will move freely, rather than snapping to the tickmarks. ``` After you file the bug report, can you please link it here, bu putting it in the URL field? Thanks!
Ah ok, no worries. Nice to see your fast response :) I have reported the issue at the qt bug tracker with your test case.
Thank you!