Added initial support of custom top bar for premium settings.

Telegram/SourceFiles/info/info_wrap_widget.cpp

@@ -17,6 +17,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "settings/cloud_password/settings_cloud_password_email_confirm.h"
 #include "settings/settings_chat.h"
 #include "settings/settings_main.h"
+#include "settings/settings_premium.h"
+#include "ui/effects/ripple_animation.h" // maskByDrawer.
 #include "ui/widgets/discrete_sliders.h"
 #include "ui/widgets/buttons.h"
 #include "ui/widgets/shadow.h"
@@ -55,6 +57,12 @@ const style::InfoTopBar &TopBarStyle(Wrap wrap) {
 		: st::infoTopBar;
 }
 
+[[nodiscard]] bool HasCustomTopBar(not_null<const Controller*> controller) {
+	const auto section = controller->section();
+	return (section.type() == Section::Type::Settings
+		&& (section.settingsType() == ::Settings::PremiumId()));
+}
+
 } // namespace
 
 struct WrapWidget::StackItem {
@@ -346,6 +354,10 @@ void WrapWidget::setupTop() {
 	//} else {
 	//	createTopBar();
 	//}
+	if (HasCustomTopBar(_controller.get())) {
+		_topBar.destroy();
+		return;
+	}
 	createTopBar();
 }
 
@@ -957,6 +969,20 @@ void WrapWidget::showNewContent(
 		const auto layer = (wrap() == Wrap::Layer);
 		animationParams.withFade = layer;
 		animationParams.topSkip = layer ? st::boxRadius : 0;
+
+		if (HasCustomTopBar(_controller.get())
+			|| HasCustomTopBar(newController.get())) {
+
+			const auto s = QSize(
+				newContent->width(),
+				animationParams.topSkip);
+			auto image = Ui::RippleAnimation::maskByDrawer(s, false, [&](
+					QPainter &p) {
+				const auto r = QRect(0, 0, s.width(), s.height() * 2);
+				p.drawRoundedRect(r, st::boxRadius, st::boxRadius);
+			});
+			animationParams.topMask = Ui::PixmapFromImage(std::move(image));
+		}
 	}
 	if (saveToStack) {
 		auto item = StackItem();

Telegram/SourceFiles/settings/settings_premium.cpp

@@ -27,6 +27,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "main/main_app_config.h"
 #include "styles/style_boxes.h"
 #include "styles/style_chat_helpers.h"
+#include "styles/style_info.h"
+#include "styles/style_intro.h"
 #include "styles/style_layers.h"
 #include "styles/style_settings.h"
 
@@ -41,6 +43,8 @@ public:
 
 	[[nodiscard]] rpl::producer<QString> title() override;
 
+	[[nodiscard]] QPointer<Ui::RpWidget> createPinnedToTop(
+		not_null<QWidget*> parent) override;
 	[[nodiscard]] QPointer<Ui::RpWidget> createPinnedToBottom(
 		not_null<Ui::RpWidget*> parent) override;
 
@@ -228,6 +232,48 @@ void Premium::setupContent() {
 
 }
 
+QPointer<Ui::RpWidget> Premium::createPinnedToTop(
+		not_null<QWidget*> parent) {
+	const auto container = Ui::CreateChild<Ui::VerticalLayout>(parent.get());
+	const auto content = container->add(object_ptr<Ui::RpWidget>(container));
+	content->resize(content->width(), st::introQrStepsTop);
+
+	container->setAttribute(Qt::WA_OpaquePaintEvent, false);
+	content->setAttribute(Qt::WA_OpaquePaintEvent, false);
+
+	content->paintRequest(
+	) | rpl::start_with_next([=](const QRect &paintRect) {
+		Painter p(content);
+
+		p.fillRect(paintRect, Qt::transparent);
+
+		const auto rect = content->rect();
+		auto pathTop = QPainterPath();
+		pathTop.addRoundedRect(rect, st::boxRadius, st::boxRadius);
+		auto pathBottom = QPainterPath();
+		pathBottom.addRect(
+			QRect(
+				QPoint(rect.x(), rect.y() + rect.height() - st::boxRadius),
+				QSize(rect.width(), st::boxRadius)));
+
+		const auto gradientPointTop = rect.height() / 3. * 2.;
+		auto gradient = QLinearGradient(
+			QPointF(0, gradientPointTop),
+			QPointF(rect.width(), rect.height() - gradientPointTop));
+		gradient.setColorAt(0., st::premiumButtonBg1->c);
+		gradient.setColorAt(.6, st::premiumButtonBg2->c);
+		gradient.setColorAt(1., st::premiumButtonBg3->c);
+
+		PainterHighQualityEnabler hq(p);
+		p.fillPath(pathTop + pathBottom, gradient);
+	}, content->lifetime());
+
+	container->setMaximumHeight(st::introQrStepsTop);
+	container->setMinimumHeight(st::infoLayerTopBarHeight);
+
+	return Ui::MakeWeak(not_null<Ui::RpWidget*>{ container });
+}
+
 QPointer<Ui::RpWidget> Premium::createPinnedToBottom(
 		not_null<Ui::RpWidget*> parent) {