Scrolling of Listview causing huge memory consumption in Qt 5.0

jitu

Hi

I have created a Qt 5.0 application. When I am running the application in windows 7, the scrolling of List view is causing huge memory consumption. The listview is a dynamic one.

Please tell a solution for this issue.

sierdzio

Please show us your code.

Are you talking about QML ListView or a QtWidget? How do you create the model and delegates?

Jeroentjehome

Hi, bit more code and information to be of service to you. What Qt version, and like slerdzio says, some code

jitu

Im using QML ListView. The list is auto-scrolled on pressing a button. The memory consumption is increasing during this process.

The code is confidential and I cannot share the code.

sierdzio

So we cannot really help you.

ListView instantiates the delegate objects as needed (new entry is generated when it is coming into view), perhaps you are not managing it's memory well enough. As a general advice, experiment with "clip" property.

jitu

But how can 'clip' property help in this case?

jitu

@import QtQuick 2.0

Rectangle {
id : viewer
width: 800
height: 480
function addItem()
{
picSrcList.append({"src":"file:///C://Images//background.png"});
picSrcList.append({"src":"file:///C://Images//folder.png"});
picSrcList.append({"src":"file:///C://Images//tick.png"});

}
ListModel {

    id : picSrcList

}
Component {
    id : picDelegate
    Image {
        source: src
        fillMode: Image.PreserveAspectFit
        asynchronous: true
        width: viewer.width
        height: viewer.height
    }
}

ListView {
    id :picListView
    anchors.fill: parent
    delegate: picDelegate
    model : picSrcList
    orientation : ListView.Horizontal
    snapMode: ListView.SnapOneItem
}
Component.onCompleted: {
    addItem()
}

}
@
This is an example code in which similar issue is seen. The memory consumption increases when we flick the list view.

sierdzio

I don't see anything amiss here. Maybe you need to turn of Image caching, or periodically run the garbage collector.