Replaced timer for dragging scroll in Dialogs::Widget with manager.

Telegram/SourceFiles/dialogs/dialogs_inner_widget.cpp

@@ -1130,7 +1130,7 @@ void InnerWidget::finishReorderPinned() {
 		_aboveIndex = -1;
 	}
 	if (wasDragging) {
-		draggingScrollDelta(0);
+		_draggingScroll.cancel();
 	}
 }
 
@@ -1220,7 +1220,7 @@ bool InnerWidget::updateReorderPinned(QPoint localPosition) {
 		return 0;
 	}();
 
-	draggingScrollDelta(delta);
+	_draggingScroll.checkDeltaScroll(delta);
 	return true;
 }
 
@@ -1930,6 +1930,10 @@ rpl::producer<> InnerWidget::updated() const {
 	return _updated.events();
 }
 
+rpl::producer<int> InnerWidget::scrollByDeltaRequests() const {
+	return _draggingScroll.scrolls();
+}
+
 rpl::producer<> InnerWidget::listBottomReached() const {
 	return _listBottomReached.events();
 }

Telegram/SourceFiles/dialogs/dialogs_inner_widget.h

@@ -9,6 +9,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "dialogs/dialogs_key.h"
 #include "data/data_messages.h"
+#include "ui/dragging_scroll_manager.h"
 #include "ui/effects/animations.h"
 #include "ui/rp_widget.h"
 #include "base/flags.h"
@@ -125,6 +126,8 @@ public:
 	[[nodiscard]] rpl::producer<ChosenRow> chosenRow() const;
 	[[nodiscard]] rpl::producer<> updated() const;
 
+	[[nodiscard]] rpl::producer<int> scrollByDeltaRequests() const;
+
 	[[nodiscard]] RowDescriptor resolveChatNext(RowDescriptor from = {}) const;
 	[[nodiscard]] RowDescriptor resolveChatPrevious(RowDescriptor from = {}) const;
 
@@ -134,7 +137,6 @@ public Q_SLOTS:
 	void onParentGeometryChanged();
 
 Q_SIGNALS:
-	void draggingScrollDelta(int delta);
 	void mustScrollTo(int scrollToTop, int scrollToBottom);
 	void dialogMoved(int movedFrom, int movedTo);
 	void searchMessages();
@@ -401,6 +403,8 @@ private:
 	object_ptr<Ui::IconButton> _cancelSearchInChat;
 	object_ptr<Ui::IconButton> _cancelSearchFromUser;
 
+	Ui::DraggingScrollManager _draggingScroll;
+
 	Key _searchInChat;
 	History *_searchInMigrated = nullptr;
 	PeerData *_searchFromPeer = nullptr;

Telegram/SourceFiles/dialogs/dialogs_widget.cpp

@@ -209,7 +209,13 @@ Widget::Widget(
 	fullSearchRefreshOn(session().settings().skipArchiveInSearchChanges(
 	) | rpl::to_empty);
 
-	connect(_inner, SIGNAL(draggingScrollDelta(int)), this, SLOT(onDraggingScrollDelta(int)));
+	_inner->scrollByDeltaRequests(
+	) | rpl::start_with_next([=](int delta) {
+		if (_scroll) {
+			_scroll->scrollToY(_scroll->scrollTop() + delta);
+		}
+	}, lifetime());
+
 	connect(_inner, &InnerWidget::mustScrollTo, [=](int top, int bottom) {
 		if (_scroll) {
 			_scroll->scrollToY(top, bottom);
@@ -866,27 +872,6 @@ void Widget::loadMoreBlockedByDate() {
 	session().api().requestMoreBlockedByDateDialogs();
 }
 
-void Widget::onDraggingScrollDelta(int delta) {
-	_draggingScrollDelta = _scroll ? delta : 0;
-	if (_draggingScrollDelta) {
-		if (!_draggingScrollTimer) {
-			_draggingScrollTimer.create(this);
-			_draggingScrollTimer->setSingleShot(false);
-			connect(_draggingScrollTimer, SIGNAL(timeout()), this, SLOT(onDraggingScrollTimer()));
-		}
-		_draggingScrollTimer->start(15);
-	} else {
-		_draggingScrollTimer.destroy();
-	}
-}
-
-void Widget::onDraggingScrollTimer() {
-	const auto delta = (_draggingScrollDelta > 0)
-		? qMin(_draggingScrollDelta * 3 / 20 + 1, Ui::kMaxScrollSpeed)
-		: qMax(_draggingScrollDelta * 3 / 20 - 1, -Ui::kMaxScrollSpeed);
-	_scroll->scrollToY(_scroll->scrollTop() + delta);
-}
-
 bool Widget::onSearchMessages(bool searchCache) {
 	auto result = false;
 	auto q = _filter->getLastText().trimmed();

Telegram/SourceFiles/dialogs/dialogs_widget.h

@@ -102,8 +102,6 @@ public:
 	~Widget();
 
 public Q_SLOTS:
-	void onDraggingScrollDelta(int delta);
-
 	void onListScroll();
 	bool onCancelSearch();
 	void onCancelSearchInChat();
@@ -117,9 +115,6 @@ public Q_SLOTS:
 
 	void onChooseByDrag();
 
-private Q_SLOTS:
-	void onDraggingScrollTimer();
-
 protected:
 	void dragEnterEvent(QDragEnterEvent *e) override;
 	void dragMoveEvent(QDragMoveEvent *e) override;
@@ -247,9 +242,6 @@ private:
 
 	QPixmap _widthAnimationCache;
 
-	object_ptr<QTimer> _draggingScrollTimer = { nullptr };
-	int _draggingScrollDelta = 0;
-
 	int _topDelta = 0;
 
 	rpl::event_stream<> _closeForwardBarRequests;

Telegram/lib_ui

@@ -1 +1 @@
-Subproject commit d27e4803a130a262b84a54c915fc83f8c9bbe2f4
+Subproject commit ba40979470132db759fe8b8e7ff8ca70845f92c1