https://bugs.kde.org/show_bug.cgi?id=512110
Bug ID: 512110
Summary: ScrollView acceleration glitches out when items are
unevenly sized (mostly on trackpads)
Classification: Frameworks and Libraries
Product: frameworks-qqc2-desktop-style
Version First 6.20.0
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Target Milestone: ---
Created attachment 186800
--> https://bugs.kde.org/attachment.cgi?id=186800&action=edit
A video of the glitch and the intended behavior side by side
When QT_QUICK_CONTROLS_STYLE="org.kde.desktop", ScrollView acceleration
behaviour changes.
The changed behavior seems to be sensitive to size changes of the scrolled
items, and often overscrolles, and doesn't return.
I've an extreme example, of this behavior.
Steps to reproduce:
1. Paste the following in a file, e.g Repeated.qml
```qml
import QtQuick
import QtQuick.Controls
Window {
visible: true
title: qsTr("Hello World")
color: "black"
ScrollView {
width: parent.width
height: parent.height
ListView {
reuseItems: true
width: parent.width
height: parent.height
clip: true
model: 100
anchors.horizontalCenter: parent.horizontalCenter
spacing: 5
delegate: Rectangle {
required property int index
width: 100;
height: 10 + (100 - index);
color: "green"
}
}
}
}
```
2. Launch the file with the following command:
QT_QUICK_CONTROLS_STYLE="org.kde.desktop" qml6 Repeated.qml
3. Using the trackpad, flick the items downwards
While this also glitches when using a scroll wheel, it is way way less
consistent,
and not as drastic as in the case of the touchpad.
On the mouse, the content sometimes "overscrolls" without coming down, but only
by ~10% of the height of the view.
I tried using the `flick` method, but it works perfectly without creating this
bug
qml6 --version:
Qml Runtime 6.10.0
qqc2-desktop-style: 6.19.0-1
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