The confusion of update strategy of scrolledXY in scrollableContainer.

[Wrend.1]

I add a two hardware button to control the up and down scrolling of scrollableContainer(use function "moveChildrenRelative"). But the function "getScrolledY()" can't update according to the scroll action. And I need the ScrolledY to respond to some events.

What should I do to deal with it？

[Alexandre RENOUX · Accepted solution]

Hello,

You are right. This is probably something we should change in the near future. I'll tell the team about it.

For the time being, I believe you can simply modify the function manually like as follows :

void ScrollableContainer::moveChildrenRelative(int16_t deltaX, int16_t deltaY)
{
    Drawable* d = firstChild;
    while (d)
    {
        if ((d != &xSlider) && (d != &ySlider))
        {
            if(calledFromOutsideTheClassFlag == true)
            {
            scrolledXDistance += deltaX;
            scrolledYDistance += deltaY;
            }
            d->moveRelative(deltaX, deltaY);
        }
        d = d->getNextSibling();
    }
}

If you want this changes to be taken into account on your board, you need to copy this class in your gui/ folder and use this customClass instead. Unfortunately this will make you unable to use the Designer since it becomes a class the Designer does not know about.

When your question is answered, please close this topic by choosing Select as Best.

/Alexandre

[Wrend.1]

OK, I got it. And I apply another way to deal with it.

I define a serise of click, drag, gestrue event to realize the similar effect​. And it can bypass this problem.😁

By the way I want to know a standard action from the professionals.