Method wheelEventTrackpad

YACReader/viewer.cpp:820–872

}

void Viewer::wheelEventTrackpad(QWheelEvent *event)
{
    auto delta = event->pixelDelta();

    // Treat pixel-based scrolling as direct manipulation, not as an animation target.
    horizontalScroller->stop();
    verticalScroller->stop();

    // Apply delta to horizontal scrollbar
    if (delta.x() != 0) {
        int newHorizontalValue = horizontalScrollBar()->value() - delta.x();
        horizontalScrollBar()->setValue(newHorizontalValue);
    }

    // Apply delta to vertical scrollbar
    if (delta.y() != 0) {
        int newVerticalValue = verticalScrollBar()->value() - delta.y();
        verticalScrollBar()->setValue(newVerticalValue);
    }

    if (continuousScroll) {
        return;
    }

    auto turnPageOnScroll = !Configuration::getConfiguration().getDoNotTurnPageOnScroll();
    auto getUseSingleScrollStepToTurnPage = Configuration::getConfiguration().getUseSingleScrollStepToTurnPage();

    if ((delta.y() < 0) && (verticalScrollBar()->sliderPosition() == verticalScrollBar()->maximum()) && turnPageOnScroll) {
        if (wheelStop || getUseSingleScrollStepToTurnPage || verticalScrollBar()->maximum() == verticalScrollBar()->minimum()) {
            if (getMovement(event) == Forward) {
                next();
                event->accept();
                wheelStop = false;
            }
            return;
        } else {
            wheelStop = true;
        }
    } else {
        if ((delta.y() > 0) && (verticalScrollBar()->sliderPosition() == verticalScrollBar()->minimum()) && turnPageOnScroll) {
            if (wheelStop || getUseSingleScrollStepToTurnPage || verticalScrollBar()->maximum() == verticalScrollBar()->minimum()) {
                if (getMovement(event) == Backward) {
                    prev();
                    event->accept();
                    wheelStop = false;
                }
                return;
            } else {
                wheelStop = true;
            }
        }
    }
}

void Viewer::resizeEvent(QResizeEvent *event)
{