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Bug
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Resolution: Incomplete
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P2: Important
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5.2.1, 5.3.0 Beta1
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None
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OS: Linux Buildroot 3.2.0 armv7l GNU/Linux
Compiler: arm-linux-gnueabihf-gcc 4.7.3
Hardware: AM3358@500-720MHz, 128MB DDR2 RAM, LCD resolution 320x480, RGB16Bit
The MouseArea of certain positioning components such as Grid seems to cause performance issues.
The following QML application shows the problem: high CPU load, especially during interactions via the touchscreen.
Just animating the grid element shows about 15% CPU load, additionally pressing & holding a grid element shows about 40% load.
In a more complex application we want to do some drag and drop operation combined with some animation: but moving a grid element while animating the others is nearly impossible (the CPU load rises up to 99%).
import QtQuick 2.2 Rectangle { color: "white" width: 320 height: 480 Grid { x: 10 y: 10 columnSpacing: 10 rowSpacing: 10 columns: 3 Repeater { model: 12 Rectangle { id: rect width: 90 height: 90 color: "dodgerblue" smooth: true antialiasing: true Text { text: qsTr("Icon") anchors.centerIn: parent } SequentialAnimation on rotation { id: rotate NumberAnimation { to: 2; duration: 60 } NumberAnimation { to: -2; duration: 120 } NumberAnimation { to: 0; duration: 60 } loops: Animation.Infinite alwaysRunToEnd: true running: false } MouseArea { anchors.fill: parent onPressed: { if(rotate.running==true) rotate.stop(); else rotate.start(); } } Component.onCompleted: rotate.start(); } } } }