QSlider linked with other QSlider - hints needed

[MasterBLB]

Hello colleagues

I'm working on the such topic:

1. I have 2 objects of MirroredSlider : public QSlider
2. Both have the same singleStep and pageStep set.
3. The goal I'd like to achieve is - when I hold down CTRL key, and change value of the 1st slider using GUI input then the other slider accordingly goes up/down single step. As a bonus - would be nice to handle usual keyboard input for QSlider too.
4. Starting values of both sliders don't have to match.

Tried reimplementing events, like

void MirroredSlider::wheelEvent(QWheelEvent *event)
{
    if (mirroredSlider && event->modifiers() == Qt::ControlModifier)
    {
        QWheelEvent *e = new QWheelEvent(QPointF(), 0, 0, 0);
        *e = *event;
        e->setModifiers(Qt::NoModifier);
        qApp->postEvent(mirroredSlider, e);
    }
    QSlider::wheelEvent(event);
}
//and for grabbing and moving slider handle
void MirroredSlider::mouseMoveEvent(QMouseEvent *event)
{
    oldValue = value();
    QSlider::mouseMoveEvent(event);
    if (mirroredSlider && event->modifiers() == Qt::ControlModifier)
    {
        if (oldValue > value())
        {
            mirroredSlider->triggerAction(QAbstractSlider::SliderSingleStepSub);
        }
        else if (oldValue < value())
        {
            mirroredSlider->triggerAction(QAbstractSlider::SliderSingleStepAdd);
        }
    }
}

The above works fine for mouse wheel and moving handle by mouse, but fails when I point anywhere on the slider, and press and hold left mouse button; btw a curiosity, log placed inside event(QEvent*) for that case shows 1st mousePress, then timer events as longs as the button is held down, then mouseRelease.

I tried to use signal valueChanged() and actionTriggered(), but also turned out to be not good enough solution.

Is there something else I should put my attention to?

[MasterBLB]

And again, soon after I post here I get stroke of genius, and find solution on my own. Happens almost every time.

[Pl45m4]

@MasterBLB said in QSlider linked with other QSlider - hints needed:

And again, soon after I post here I get stroke of genius, and find solution on my own. Happens almost every time.

Rubber Duck Debugging at its best :))

[MasterBLB]

@Pl45m4 said in QSlider linked with other QSlider - hints needed:

@MasterBLB said in QSlider linked with other QSlider - hints needed:

And again, soon after I post here I get stroke of genius, and find solution on my own. Happens almost every time.

Rubber Duck Debugging at its best :))

Yepp, though before posting I spent several hours testing different approaches - most interesting finding was that for press and hold lmb on non-handle element of the slider invokes timer events. The most important discovery was:

1. value() returns something
2. an event happens
3. if the event was some kind which affect the value now, just after QSlider::event(), the value() should be different

after realizing that the rest was easy.