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Telegram/SourceFiles/ui/controls/button_labels.cpp

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "ui/controls/button_labels.h"
+
+#include "ui/widgets/buttons.h"
+#include "ui/widgets/labels.h"
+
+namespace Ui {
+
+void SetButtonTwoLabels(
+		not_null<Ui::RoundButton*> button,
+		rpl::producer<TextWithEntities> title,
+		rpl::producer<TextWithEntities> subtitle,
+		const style::FlatLabel &st,
+		const style::FlatLabel &subst,
+		const style::color *textFg) {
+	const auto buttonTitle = Ui::CreateChild<Ui::FlatLabel>(
+		button,
+		std::move(title),
+		st);
+	buttonTitle->show();
+	const auto buttonSubtitle = Ui::CreateChild<Ui::FlatLabel>(
+		button,
+		rpl::duplicate(
+			subtitle
+		) | rpl::filter([](const TextWithEntities &text) {
+			return !text.empty();
+		}),
+		subst);
+	buttonSubtitle->setOpacity(0.6);
+	if (textFg) {
+		buttonTitle->setTextColorOverride((*textFg)->c);
+		buttonSubtitle->setTextColorOverride((*textFg)->c);
+		style::PaletteChanged() | rpl::on_next([=] {
+			buttonTitle->setTextColorOverride((*textFg)->c);
+			buttonSubtitle->setTextColorOverride((*textFg)->c);
+		}, buttonTitle->lifetime());
+	}
+	rpl::combine(
+		button->sizeValue(),
+		buttonTitle->sizeValue(),
+		buttonSubtitle->sizeValue(),
+		std::move(subtitle)
+	) | rpl::on_next([=](
+			QSize outer,
+			QSize title,
+			QSize subtitle,
+			const TextWithEntities &subtitleText) {
+		const auto withSubtitle = !subtitleText.empty();
+		buttonSubtitle->setVisible(withSubtitle);
+
+		const auto two = title.height() + subtitle.height();
+		const auto titleTop = withSubtitle
+			? (outer.height() - two) / 2
+			: button->st().textTop;
+		const auto subtitleTop = titleTop + title.height();
+		buttonTitle->moveToLeft(
+			(outer.width() - title.width()) / 2,
+			titleTop);
+		buttonSubtitle->moveToLeft(
+			(outer.width() - subtitle.width()) / 2,
+			subtitleTop);
+	}, buttonTitle->lifetime());
+	buttonTitle->setAttribute(Qt::WA_TransparentForMouseEvents);
+	buttonSubtitle->setAttribute(Qt::WA_TransparentForMouseEvents);
+}
+
+} // namespace Ui