Method update

forms/listbox.cpp:189–254

}

void ListBox::update()
{
	Control::update();
	if (scroller == nullptr)
	{
		configureInternalScrollBar();
	}
	if (scroller)
	{
		size_t scrollerLength = Controls.empty() ? 0 : ItemSpacing * (Controls.size() - 1);
		// deduct the listbox size from the content size
		// assume item sizes are variable if ItemSize is 0 (ie: need to calculate manually)
		switch (ListOrientation)
		{
			case Orientation::Vertical:
			{
				if (ItemSize == 0)
				{
					for (const auto &i : Controls)
						scrollerLength += i->Size.y;
				}
				else
				{
					scrollerLength += Controls.size() * ItemSize;
				}
				scrollerLength = scrollerLength > Size.y ? scrollerLength - Size.y : 0;
				break;
			}
			case Orientation::Horizontal:
			{
				if (ItemSize == 0)
				{
					for (const auto &i : Controls)
						scrollerLength += i->Size.x;
				}
				else
				{
					scrollerLength += Controls.size() * ItemSize;
				}
				scrollerLength = scrollerLength > Size.x ? scrollerLength - Size.x : 0;
				break;
			}
			default:
				LogWarning("Unknown ListBox::ListOrientation value: %d",
				           static_cast<int>(ListOrientation));
				break;
		}
		scroller->setMaximum(scroller->getMinimum() + scrollerLength);
		scroller->update();
		Vec2<int> newScrollOffset = this->scrollOffset;
		switch (ScrollOrientation)
		{
			case Orientation::Vertical:
				newScrollOffset.y = scroller->getValue();
				break;
			case Orientation::Horizontal:
				newScrollOffset.x = scroller->getValue();
				break;