From 4ef7f0dd246e79f352fdd01f6957ab5ee4f84c06 Mon Sep 17 00:00:00 2001
From: 23rd <23rd@vivaldi.net>
Date: Sat, 20 Sep 2025 18:50:42 +0300
Subject: [PATCH] Added ability to display non-negative numbers in
 CharactersLimitLabel.

---
 .../history_view_characters_limit.cpp         | 53 +++++++++++++------
 .../controls/history_view_characters_limit.h  |  5 ++
 2 files changed, 42 insertions(+), 16 deletions(-)

diff --git a/Telegram/SourceFiles/history/view/controls/history_view_characters_limit.cpp b/Telegram/SourceFiles/history/view/controls/history_view_characters_limit.cpp
index c3f273674f..275acb3604 100644
--- a/Telegram/SourceFiles/history/view/controls/history_view_characters_limit.cpp
+++ b/Telegram/SourceFiles/history/view/controls/history_view_characters_limit.cpp
@@ -10,36 +10,57 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/rect.h"
 #include "styles/style_chat_helpers.h"
 
+namespace {
+
+constexpr auto kMinus = QChar(0x2212);
+constexpr auto kLimit = int(999);
+
+[[nodiscard]] int CountDigits(int n) {
+	return n == 0 ? 1 : static_cast<int>(std::log10(std::abs(n))) + 1;
+}
+
+} // namespace
+
 namespace HistoryView::Controls {
 
 CharactersLimitLabel::CharactersLimitLabel(
 	not_null<Ui::RpWidget*> parent,
 	not_null<Ui::RpWidget*> widgetToAlign,
 	style::align align)
-: Ui::FlatLabel(parent, st::historyCharsLimitationLabel) {
+: Ui::FlatLabel(parent, st::historyCharsLimitationLabel)
+, _widgetToAlign(widgetToAlign)
+, _position((align == style::al_top)
+	? Fn<void(int, const QRect &)>([=](int height, const QRect &g) {
+		const auto w = textMaxWidth();
+		move(g.x() + (g.width() - w) / 2, rect::bottom(g));
+	})
+	: Fn<void(int, const QRect &)>([=](int height, const QRect &g) {
+		const auto w = textMaxWidth();
+		move(g.x() + (g.width() - w) / 2, g.y() - height);
+	})) {
 	Expects((align == style::al_top) || align == style::al_bottom);
-	const auto w = st::historyCharsLimitationLabel.minWidth;
-	using F = Fn<void(int, const QRect &)>;
-	const auto position = (align == style::al_top)
-		? F([=](int height, const QRect &g) {
-			move(g.x() + (g.width() - w) / 2, rect::bottom(g));
-		})
-		: F([=](int height, const QRect &g) {
-			move(g.x() + (g.width() - w) / 2, g.y() - height);
-		});
 	rpl::combine(
 		Ui::RpWidget::heightValue(),
 		widgetToAlign->geometryValue()
-	) | rpl::start_with_next(position, lifetime());
+	) | rpl::start_with_next(_position, lifetime());
 }
 
 void CharactersLimitLabel::setLeft(int value) {
-	if (value <= 0) {
-		return;
+	const auto orderChanged = (CountDigits(value) != CountDigits(_lastValue));
+	_lastValue = value;
+
+	if (value > 0) {
+		setTextColorOverride(st::historyCharsLimitationLabel.textFg->c);
+		Ui::FlatLabel::setText(kMinus
+			+ QString::number(std::min(value, kLimit)));
+	} else {
+		setTextColorOverride(st::windowSubTextFg->c);
+		Ui::FlatLabel::setText(QString::number(-value));
+	}
+
+	if (orderChanged) {
+		_position(height(), _widgetToAlign->geometry());
 	}
-	constexpr auto kMinus = QChar(0x2212);
-	constexpr auto kLimit = int(999);
-	Ui::FlatLabel::setText(kMinus + QString::number(std::min(value, kLimit)));
 }
 
 } // namespace HistoryView::Controls
diff --git a/Telegram/SourceFiles/history/view/controls/history_view_characters_limit.h b/Telegram/SourceFiles/history/view/controls/history_view_characters_limit.h
index 3b6054e191..e0e1b854ac 100644
--- a/Telegram/SourceFiles/history/view/controls/history_view_characters_limit.h
+++ b/Telegram/SourceFiles/history/view/controls/history_view_characters_limit.h
@@ -20,6 +20,11 @@ public:
 
 	void setLeft(int value);
 
+private:
+	int _lastValue = 0;
+	not_null<Ui::RpWidget*> _widgetToAlign;
+	Fn<void(int, const QRect &)> _position;
+
 };
 
 } // namespace HistoryView::Controls