https://bugs.kde.org/show_bug.cgi?id=468903
Bug ID: 468903
Summary: ProgressBar animation causes redraws even if invisible
Classification: Plasma
Product: Breeze
Version: git-stable-Plasma/5.27
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: QStyle
Assignee: plasma-b...@kde.org
Reporter: fab...@ritter-vogt.de
CC: noaha...@gmail.com, uhh...@gmail.com
Target Milestone: ---
It was noticed that discover has high CPU use even when idle.
I narrowed this down to a Kirigami.LoadingPlaceholder and furtder to the QQC2
ProgressBar.
Breeze has its own animation engine for progress bars, which calls updateItem
regularly even for invisible items.
Reproducer:
import QtQuick 2.15
import QtQuick.Controls 2.15
ProgressBar {
id: p
width: 100
height: 100
visible: true
onVisibleChanged: console.log(this, visible)
indeterminate: true
Timer {
interval: 1000
repeat: false
running: true
onTriggered: parent.visible = false;
}
}
Run with QT_LOGGING_RULES=*.debug=true to see the scheduled draws.
Originally reproduced downstream:
http://bugzilla.opensuse.org/show_bug.cgi?id=1210747
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