Qt Animation: "A paint device can only be painted by one painter at a time."

SGaist

Hi and welcome to devnet,

Since you do not keep the animation, I would use the parameter of the start method to let it be destroyed appropriately. See if that improves the situation.

RyanAR

@SGaist Thanks for the response!

I replaced all the start() functions with start(QAbstractAnimation::DeleteWhenStopped), but I'm still getting the same warnings whenever I click the navigation buttons.

Is it a requirement to use the save/restore functions for this type of animation, as I get the odd message about unbalanced save/restore? This is the qDebug+Warning output from a single button click:

MainWindow::on_buttonHomeAll_clicked: D to All.
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::worldTransform: Painter not active
QWidgetEffectSourcePrivate::pixmap: Painter not active
QPainter::save: Painter not active
QPainter::setOpacity: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::worldTransform: Painter not active
QWidgetEffectSourcePrivate::pixmap: Painter not active
QPainter::save: Painter not active
QPainter::setOpacity: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::worldTransform: Painter not active
QWidgetEffectSourcePrivate::pixmap: Painter not active
QPainter::save: Painter not active
QPainter::setOpacity: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::worldTransform: Painter not active
QWidgetEffectSourcePrivate::pixmap: Painter not active
QPainter::save: Painter not active
QPainter::setOpacity: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::worldTransform: Painter not active
QWidgetEffectSourcePrivate::pixmap: Painter not active
QPainter::save: Painter not active
QPainter::setOpacity: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::worldTransform: Painter not active
QWidgetEffectSourcePrivate::pixmap: Painter not active
QPainter::save: Painter not active
QPainter::setOpacity: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::worldTransform: Painter not active
QWidgetEffectSourcePrivate::pixmap: Painter not active
QPainter::save: Painter not active
QPainter::setOpacity: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::restore: Unbalanced save/restore

Updated implementation of same button click

qDebug() << "MainWindow::on_buttonHomeAll_clicked: D to All.";
        // Button Movement
        QPropertyAnimation *animation5 = new QPropertyAnimation(ui->buttonFuel7, "geometry");
        animation5->setDuration(300);
        animation5->setStartValue(ui->buttonFuel7->geometry());
        animation5->setEndValue(QRect(80, 930, 290, 290));
        animation5->start(QAbstractAnimation::DeleteWhenStopped);
        // / Button Movement

        // Button Movement
        QPropertyAnimation *animation3 = new QPropertyAnimation(ui->buttonFuel8, "geometry");
        animation3->setDuration(300);
        animation3->setStartValue(ui->buttonFuel8->geometry());
        animation3->setEndValue(QRect(395, 930, 290, 290));
        animation3->start(QAbstractAnimation::DeleteWhenStopped);
        // / Button Movement

        // Button Movement
        QPropertyAnimation *animation4 = new QPropertyAnimation(ui->buttonFuel9, "geometry");
        animation4->setDuration(300);
        animation4->setStartValue(ui->buttonFuel9->geometry());
        animation4->setEndValue(QRect(710, 930, 290, 290));
        animation4->start(QAbstractAnimation::DeleteWhenStopped);
        // / Button Movement



        // Fade In
        QGraphicsOpacityEffect *fadeInEffect1 = new QGraphicsOpacityEffect(this);
        ui->buttonFuel1->setGraphicsEffect(fadeInEffect1);
        QPropertyAnimation *animationFaceIn = new QPropertyAnimation(fadeInEffect1,"opacity");
        animationFaceIn->setDuration(300);
        animationFaceIn->setStartValue(0);
        animationFaceIn->setEndValue(1);
        animationFaceIn->setEasingCurve(QEasingCurve::InBack);
        animationFaceIn->start(QAbstractAnimation::DeleteWhenStopped);

        connect(animationFaceIn,&QPropertyAnimation::finished,[=](){fadeInEffect1->deleteLater(); ui->buttonFuel1->setVisible(1); });
        // / Fade In

        // Fade In
        QGraphicsOpacityEffect *fadeInEffect2 = new QGraphicsOpacityEffect(this);
        ui->buttonFuel2->setGraphicsEffect(fadeInEffect2);
        QPropertyAnimation *animationFaceIn2 = new QPropertyAnimation(fadeInEffect2,"opacity");
        animationFaceIn2->setDuration(300);
        animationFaceIn2->setStartValue(0);
        animationFaceIn2->setEndValue(1);
        animationFaceIn2->setEasingCurve(QEasingCurve::InBack);
        animationFaceIn2->start(QAbstractAnimation::DeleteWhenStopped);

        connect(animationFaceIn2,&QPropertyAnimation::finished,[=](){fadeInEffect2->deleteLater(); ui->buttonFuel2->setVisible(1); });
        // / Fade In

        // Fade In
        QGraphicsOpacityEffect *fadeInEffect3 = new QGraphicsOpacityEffect(this);
        ui->buttonFuel3->setGraphicsEffect(fadeInEffect3);
        QPropertyAnimation *animationFaceIn3 = new QPropertyAnimation(fadeInEffect3,"opacity");
        animationFaceIn3->setDuration(300);
        animationFaceIn3->setStartValue(0);
        animationFaceIn3->setEndValue(1);
        animationFaceIn3->setEasingCurve(QEasingCurve::InBack);
        animationFaceIn3->start(QAbstractAnimation::DeleteWhenStopped);

        connect(animationFaceIn3,&QPropertyAnimation::finished,[=](){fadeInEffect3->deleteLater(); ui->buttonFuel3->setVisible(1); });
        // / Fade In

        // Fade In
        QGraphicsOpacityEffect *fadeInEffect4 = new QGraphicsOpacityEffect(this);
        ui->buttonFuel4->setGraphicsEffect(fadeInEffect4);
        QPropertyAnimation *animationFaceIn4 = new QPropertyAnimation(fadeInEffect4,"opacity");
        animationFaceIn4->setDuration(300);
        animationFaceIn4->setStartValue(0);
        animationFaceIn4->setEndValue(1);
        animationFaceIn4->setEasingCurve(QEasingCurve::InBack);
        animationFaceIn4->start(QAbstractAnimation::DeleteWhenStopped);

        connect(animationFaceIn4,&QPropertyAnimation::finished,[=](){fadeInEffect4->deleteLater(); ui->buttonFuel4->setVisible(1); });
        // / Fade In

        // Fade In
        QGraphicsOpacityEffect *fadeInEffect5 = new QGraphicsOpacityEffect(this);
        ui->buttonFuel5->setGraphicsEffect(fadeInEffect5);
        QPropertyAnimation *animationFaceIn5 = new QPropertyAnimation(fadeInEffect5,"opacity");
        animationFaceIn5->setDuration(300);
        animationFaceIn5->setStartValue(0);
        animationFaceIn5->setEndValue(1);
        animationFaceIn5->setEasingCurve(QEasingCurve::InBack);
        animationFaceIn5->start(QAbstractAnimation::DeleteWhenStopped);

        connect(animationFaceIn5,&QPropertyAnimation::finished,[=](){fadeInEffect5->deleteLater(); ui->buttonFuel5->setVisible(1); });
        // / Fade In

        // Fade In
        QGraphicsOpacityEffect *fadeInEffect6 = new QGraphicsOpacityEffect(this);
        ui->buttonFuel6->setGraphicsEffect(fadeInEffect6);
        QPropertyAnimation *animationFaceIn6 = new QPropertyAnimation(fadeInEffect6,"opacity");
        animationFaceIn6->setDuration(300);
        animationFaceIn6->setStartValue(0);
        animationFaceIn6->setEndValue(1);
        animationFaceIn6->setEasingCurve(QEasingCurve::InBack);
        animationFaceIn6->start(QAbstractAnimation::DeleteWhenStopped);

        connect(animationFaceIn6,&QPropertyAnimation::finished,[=](){fadeInEffect6->deleteLater(); ui->buttonFuel6->setVisible(1); });
        // / Fade In

        // Fade In
        QGraphicsOpacityEffect *fadeInEffect7 = new QGraphicsOpacityEffect(this);
        ui->buttonFuel10->setGraphicsEffect(fadeInEffect7);
        QPropertyAnimation *animationFaceIn7 = new QPropertyAnimation(fadeInEffect7,"opacity");
        animationFaceIn7->setDuration(300);
        animationFaceIn7->setStartValue(0);
        animationFaceIn7->setEndValue(1);
        animationFaceIn7->setEasingCurve(QEasingCurve::InBack);
        animationFaceIn7->start(QAbstractAnimation::DeleteWhenStopped);

        connect(animationFaceIn7,&QPropertyAnimation::finished,[=](){fadeInEffect7->deleteLater(); ui->buttonFuel10->setVisible(1); });
        // / Fade In

SGaist

Can you provide a minimal compilable example that reproduces this ?

Did you try with 6.2 since was released yesterday ?

RyanAR

@SGaist

Thanks for taking the time! I have tried with the following compilers, all issuing the same warnings;

Qt 6.1.2 MinGW & MSVC 2019 64-bit
Qt 5.12.11 MinGW 64-bit & 32-bit
Qt 5.12.11 MSVC 2017 64-bit
Edit: Qt 6.2 MingGW 64-bit

I have cleaned up the code and made a GitHub Gist as I kept hitting the character limit for the forums. If you would like it in another format, please feel free to let me know.

Project Link.

SGaist

Works for me on macOS with Qt 5.15.2.

RyanAR

@SGaist

Very strange! It is worth mentioning that I only get the warnings when I click one of the main navigation bars, then one of the filters.

For example; click Supply, then Home (no warnings), then Filter 2 (warnings spam).

RyanAR

If anyone else is able to trigger the warnings by clicking Supply, Home, then the Filters, please let me know what versions you're running!

Thanks,
Ryan

RyanAR

I ended up requesting support with Qt Enterprise and they gave instructions on how to fix it.

For anyone else having this issue, I had to setGraphicsEffect to nullptr after the animation has finished: "ui->buttonItem10->setGraphicsEffect(nullptr);".

connect(animationFadeIn7,&QPropertyAnimation::finished,[=](){effectFadeOut7->deleteLater(); ui->buttonItem10->setVisible(0); ui->buttonItem10->setGraphicsEffect(nullptr); });

SGaist

Thanks for the feedback and solution !

Dawn_of_Time

It's nice to find out after a few years. My understanding of this error is that qt does not allow qgraphicseffect in parent-child controls to work at the same time. Therefore, a good practice is to turn qgraphicseffect on when you need to use it, using effect->setEnabled(ture), and turn it off when you don't need it.
In addition, because my English is not good, the above content is translated from the translation software. Please forgive me.