Added ability to set pinned intervals to sub tabs for gifts collection.

Telegram/SourceFiles/info/peer_gifts/info_peer_gifts_widget.cpp

@@ -1226,12 +1226,15 @@ void InnerWidget::refreshCollectionsTabs() {
 				&Data::GiftCollection::id))
 			? QString::number(selectedId)
 			: u"all"_q;
+		const auto tabsCount = tabs.size();
 		_collectionsTabs = std::make_unique<Ui::SubTabs>(
 			this,
 			st::collectionSubTabs,
 			Ui::SubTabs::Options{ .selected = selected, .centered = true },
 			std::move(tabs),
 			context);
+		_collectionsTabs->setPinnedInterval(0, 1);
+		_collectionsTabs->setPinnedInterval(tabsCount - 1, tabsCount);
 		_collectionsTabs->show();
 
 		_collectionsTabs->activated(

Telegram/SourceFiles/ui/controls/sub_tabs.cpp

@@ -118,6 +118,23 @@ bool SubTabs::reorderEnabled() const {
 	return _reorderEnable;
 }
 
+void SubTabs::setPinnedInterval(int from, int to) {
+	_pinnedIntervals.push_back({ from, to });
+}
+
+void SubTabs::clearPinnedIntervals() {
+	_pinnedIntervals.clear();
+}
+
+bool SubTabs::isIndexPinned(int index) const {
+	for (const auto &interval : _pinnedIntervals) {
+		if (index >= interval.from && index < interval.to) {
+			return true;
+		}
+	}
+	return false;
+}
+
 void SubTabs::setSelected(int index) {
 	const auto was = (_selected >= 0);
 	const auto now = (index >= 0);
@@ -285,7 +302,7 @@ void SubTabs::paintEvent(QPaintEvent *e) {
 		const auto &button = _buttons[i];
 		const auto geometry = button.geometry.translated(shift);
 
-		if (hasShake && _reorderEnable) {
+		if (hasShake && _reorderEnable && !isIndexPinned(i)) {
 			shakeTransform(p, i, geometry.topLeft(), now);
 		}
 
@@ -303,7 +320,7 @@ void SubTabs::paintEvent(QPaintEvent *e) {
 			.availableWidth = button.text.maxWidth(),
 		});
 
-		if (hasShake && _reorderEnable) {
+		if (hasShake && _reorderEnable && !isIndexPinned(i)) {
 			p.resetTransform();
 		}
 	}

Telegram/SourceFiles/ui/controls/sub_tabs.h

@@ -51,6 +51,9 @@ public:
 	void setReorderEnabled(bool enabled);
 	[[nodiscard]] bool reorderEnabled() const;
 
+	void setPinnedInterval(int from, int to);
+	void clearPinnedIntervals();
+
 	[[nodiscard]] rpl::producer<QString> activated() const;
 	[[nodiscard]] rpl::producer<QString> contextMenuRequests() const;
 
@@ -75,6 +78,7 @@ private:
 	void setActive(int index);
 	[[nodiscard]] QPoint scroll() const;
 	void shakeTransform(QPainter &p, int index, QPoint position, crl::time now) const;
+	[[nodiscard]] bool isIndexPinned(int index) const;
 
 	const style::SubTabs &_st;
 	std::vector<Button> _buttons;
@@ -96,6 +100,11 @@ private:
 	bool _centered = false;
 	bool _reorderEnable = false;
 	Ui::Animations::Basic _shakeAnimation;
+	struct PinnedInterval {
+		int from;
+		int to;
+	};
+	std::vector<PinnedInterval> _pinnedIntervals;
 
 };