redraw problem with qt quick 5.10 under Mojave (OSX 10.14)

igor_stravinsky

I just did an update to 10.14, and after doing it, it seems that Qt Quick Controls 2 objects aren't redrawing when expected.

Changing the visibility of an object, for instance, doesn't make it appear and disappear. Interestingly, if I hide my application window behind another window and then bring it to the fore, the object will redraw correctly.

Any ideas why this would be happening?

I'm attaching a sample project that demonstrates the issue.

import QtQuick 2.10
import QtQuick.Window 2.2
import QtQuick.Controls 2.3


Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Button{

        id:clickmeButton
        anchors.centerIn: parent
        text: "click me"

        onClicked:{
            if (changingText.visible){
                changingText.visible = false;
            }
            else{

                changingText.visible = true;
            }
        }
    }

    Label{
        id:changingText
        anchors{
            horizontalCenter: parent.horizontalCenter
            top: clickmeButton.bottom
            topMargin: 25
        }
        font.pixelSize: 48

        text:"label"

        onVisibleChanged:{
            console.log("visibility=",visible)
        }
    }
}

SGaist

Hi,

Can you test with a more recent version of Qt ? Qt 5.11 is the current release with 5.12 around the corner.

igor_stravinsky

It appears to be fixed under 5.11

I haven't updated to 5.11 because that version drop support for a 32-bit web view, but now it looks as if my hand will be forced...

Thanks for the suggestion!

SGaist

Do you mean you were building Qt yourself in 32bit mode ?

Because it's been years that 32bit support has been dropped by Apple.

igor_stravinsky

@SGaist
I'm working on a cross-platform project, but doing development on a mac.

On Mac, everything is happy, but on Windows, I wasn't able to move to 5.11 because the 32 bit version of WebView disappeared from Qt. I had other dependencies that kept me from switching to a 64 bit Windows build.

SGaist

Which module are you using for your web view ?

igor_stravinsky

@SGaist We're using the standard QML WebView.

SGaist

Except that WebView can come from different modules: QtWebView and QtWebEngine, hence my question.

igor_stravinsky

@SGaist We're using the QtWebView, not the engine

SGaist

Ok, then IIRC, on platforms that don't provide a native web view, QtWebEngine is used, hence the inherited limitations on these platforms.