Function PricesBox

Telegram/SourceFiles/boxes/star_gift_box.cpp:3683–3839

}

void PricesBox(
		not_null<Ui::GenericBox*> box,
		const std::vector<UpgradePrice> &list,
		rpl::producer<int> cost) {
	const auto top = box->setPinnedToTopContent(
		object_ptr<Ui::VerticalLayout>(box));
	box->setWidth(st::boxWideWidth);
	box->setStyle(st::boostBox);

	struct State {
		rpl::variable<int> cost;
	};
	const auto state = box->lifetime().make_state<State>();
	state->cost = std::move(cost);
	const auto min = list.back().stars;
	const auto max = std::max(min + 2, list.front().stars);
	const auto from = 0;
	const auto till = max - min;

	const auto addSkip = [&](int skip) {
		top->add(object_ptr<Ui::FixedHeightWidget>(top, skip));
	};

	const auto ratio = [=](int current) {
		current = std::clamp(current, from, till);
		const auto count = (till - from);
		const auto index = (current - from);
		if (count <= 2) {
			return 0.5;
		}
		const auto available = st::boxWideWidth
			- st::boxPadding.left()
			- st::boxPadding.right();
		const auto average = available / float64(count);
		const auto levelWidth = [&](int stars) {
			return st::normalFont->width(Lang::FormatCountDecimal(stars));
		};
		const auto paddings = 2 * st::premiumLineTextSkip;
		const auto labelLeftWidth = paddings + levelWidth(min);
		const auto labelRightWidth = paddings + levelWidth(max);
		const auto first = std::max(average, labelLeftWidth * 1.);
		const auto last = std::max(average, labelRightWidth * 1.);
		const auto other = (available - first - last) / (count - 2);
		return (first + (index - 1) * other) / available;
	};

	auto bubbleRowState = state->cost.value(
	) | rpl::map([=](int value) {
		return Premium::BubbleRowState{
			.counter = max - value,
			.ratio = ratio(max - value),
			.dynamic = true,
		};
	});
	Premium::AddBubbleRow(
		top,
		st::starRatingBubble,
		box->showFinishes(),