Fill suggested prices for gifts between stars/TON.

Telegram/SourceFiles/boxes/star_gift_box.cpp

@@ -239,37 +239,6 @@ struct SessionResalePrices {
 	crl::time lastReceived = 0;
 };
 
-[[nodiscard]] CreditsAmount StarsFromTon(
-		not_null<Main::Session*> session,
-		CreditsAmount ton) {
-	const auto appConfig = &session->appConfig();
-	const auto starsRate = appConfig->starsWithdrawRate() / 100.;
-	const auto tonRate = appConfig->currencyWithdrawRate();
-	if (!starsRate) {
-		return {};
-	}
-	const auto count = (ton.value() * tonRate) / starsRate;
-	return CreditsAmount(int(base::SafeRound(count)));
-}
-
-[[nodiscard]] CreditsAmount TonFromStars(
-		not_null<Main::Session*> session,
-		CreditsAmount stars) {
-	const auto appConfig = &session->appConfig();
-	const auto starsRate = appConfig->starsWithdrawRate() / 100.;
-	const auto tonRate = appConfig->currencyWithdrawRate();
-	if (!tonRate) {
-		return {};
-	}
-	const auto count = (stars.value() * starsRate) / tonRate;
-	const auto whole = int(std::floor(count));
-	const auto cents = int(base::SafeRound((count - whole) * 100));
-	return CreditsAmount(
-		whole,
-		cents * (Ui::kNanosInOne / 100),
-		CreditsType::Ton);
-}
-
 [[nodiscard]] not_null<SessionResalePrices*> ResalePrices(
 		not_null<Main::Session*> session) {
 	static auto result = base::flat_map<
@@ -5460,4 +5429,35 @@ rpl::lifetime ShowStarGiftResale(
 	});
 }
 
+CreditsAmount StarsFromTon(
+		not_null<Main::Session*> session,
+		CreditsAmount ton) {
+	const auto appConfig = &session->appConfig();
+	const auto starsRate = appConfig->starsWithdrawRate() / 100.;
+	const auto tonRate = appConfig->currencyWithdrawRate();
+	if (!starsRate) {
+		return {};
+	}
+	const auto count = (ton.value() * tonRate) / starsRate;
+	return CreditsAmount(int(base::SafeRound(count)));
+}
+
+CreditsAmount TonFromStars(
+		not_null<Main::Session*> session,
+		CreditsAmount stars) {
+	const auto appConfig = &session->appConfig();
+	const auto starsRate = appConfig->starsWithdrawRate() / 100.;
+	const auto tonRate = appConfig->currencyWithdrawRate();
+	if (!tonRate) {
+		return {};
+	}
+	const auto count = (stars.value() * starsRate) / tonRate;
+	const auto whole = int(std::floor(count));
+	const auto cents = int(base::SafeRound((count - whole) * 100));
+	return CreditsAmount(
+		whole,
+		cents * (Ui::kNanosInOne / 100),
+		CreditsType::Ton);
+}
+
 } // namespace Ui

Telegram/SourceFiles/boxes/star_gift_box.h

@@ -165,4 +165,11 @@ void ShowResaleGiftBoughtToast(
 	QString title,
 	Fn<void()> finishRequesting);
 
+[[nodiscard]] CreditsAmount StarsFromTon(
+	not_null<Main::Session*> session,
+	CreditsAmount ton);
+[[nodiscard]] CreditsAmount TonFromStars(
+	not_null<Main::Session*> session,
+	CreditsAmount stars);
+
 } // namespace Ui

Telegram/SourceFiles/history/view/controls/history_view_suggest_options.cpp

@@ -9,6 +9,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "base/event_filter.h"
 #include "base/unixtime.h"
+#include "boxes/star_gift_box.h"
 #include "chat_helpers/compose/compose_show.h"
 #include "core/ui_integration.h"
 #include "data/components/credits.h"
@@ -271,7 +272,7 @@ StarsTonPriceInput AddStarsTonPriceInput(
 
 	auto computeResult = [=]() -> std::optional<CreditsAmount> {
 		auto nanos = int64();
-		const auto ton = uint32(state->ton.current() ? 1 : 0);
+		const auto ton = state->ton.current();
 		if (ton) {
 			const auto text = tonField->getLastText();
 			const auto now = Ui::ParseTonAmountString(text);
@@ -302,16 +303,41 @@ StarsTonPriceInput AddStarsTonPriceInput(
 		}
 		state->updates.fire({});
 	};
-	QObject::connect(
-		starsField,
-		&Ui::NumberInput::changed,
-		starsField,
-		updatePrice);
+	const auto updateTonFromStars = [=] {
+		if (auto result = computeResult(); result && result->stars()) {
+			const auto v = Ui::TonFromStars(session, *result);
+			const auto amount = v.whole() * Ui::kNanosInOne + v.nano();
+			tonField->setText(
+				Ui::FormatTonAmount(amount, Ui::TonFormatFlag::Simple).full);
+		}
+	};
+	const auto updateStarsFromTon = [=] {
+		if (auto result = computeResult(); result && result->ton()) {
+			const auto v = Ui::StarsFromTon(session, *result);
+			starsField->setText(QString::number(v.whole()));
+		}
+	};
+	QObject::connect(starsField, &Ui::NumberInput::changed, starsField, [=] {
+		if (!state->ton.current()) {
+			updatePrice();
+			updateTonFromStars();
+		}
+	});
 	tonField->changes(
-	) | rpl::start_with_next(updatePrice, tonField->lifetime());
+	) | rpl::start_with_next([=] {
+		if (state->ton.current()) {
+			updatePrice();
+			updateStarsFromTon();
+		}
+	}, tonField->lifetime());
 
 	state->ton.changes(
 	) | rpl::start_with_next(updatePrice, container->lifetime());
+	if (state->ton.current()) {
+		updateStarsFromTon();
+	} else {
+		updateTonFromStars();
+	}
 
 	QObject::connect(
 		starsField,