QPropertyAnimation doesnt do anything

[superpacko]

We came up with a weird problem. We have a Widget with a few buttons, when clicking on one the widget should expand down, showing a progress bar.

The thing is that if we do:

void frmCreateKeys::slotGenerateKey()
{
    if (!validatePage())
        return;
 
    /// Animate the frame, to grow and show the progress bar
    QPropertyAnimation animationFrame(this, "geometry");
    animationFrame.setDuration(300);
    animationFrame.setEndValue(QRect(this->pos().x()+7,this->pos().y()+30, this->width(), this->height() + 60));
    animationFrame.start();
 
    ui->msgLabel->setVisible(true);
    ui->pBar->setVisible(true);
    this->repaint();
 
    emit createKey(); // a long task
}

void frmCreateKeys::slotGenerateKey()
{
    if (!validatePage())
        return;

    /// Animate the frame, to grow and show the progress bar
    QPropertyAnimation animationFrame(this, "geometry");
    animationFrame.setDuration(300);
    animationFrame.setEndValue(QRect(this->pos().x()+7,this->pos().y()+30, this->width(), this->height() + 60));
    animationFrame.start();

    ui->msgLabel->setVisible(true);
    ui->pBar->setVisible(true);
    this->repaint();

    emit createKey(); // a long task
}

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it doesnt animate, meaning the widget doesnt expand down. Now if we change the animationFrame variable to be a pointer, then everything works fine.

/// Animate the frame, to grow and show the progress bar
    QPropertyAnimation *animationFrame = new QPropertyAnimation (this, "geometry");

/// Animate the frame, to grow and show the progress bar
    QPropertyAnimation *animationFrame = new QPropertyAnimation (this, "geometry");

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Any ideas why this could be happening?

[sakya]

Any ideas why this could be happening?

Yes, your QPropertyAnimation is deleted when slotGenerateKey finish.

[superpacko]

yeah, i thought so, but i also thought that the animation was performed in a thread, thus copying everything to a new object that handles the animation.

anyway, thanks for the quick response!

[sakya]

The animation will be deleted as it finish if you start your animation with

animationFrame->start(QAbstractAnimation::DeleteWhenStopped);

animationFrame->start(QAbstractAnimation::DeleteWhenStopped);

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