From 294432ceed2b5c7b23528d8a204af81856b2d144 Mon Sep 17 00:00:00 2001
From: 23rd <23rd@vivaldi.net>
Date: Wed, 23 Nov 2022 14:13:01 +0300
Subject: [PATCH] Differentiated replies in groups by color.

---
 .../history/history_item_components.cpp       | 40 +++++++++++++++----
 .../history/history_item_components.h         |  2 +
 .../history/view/history_view_message.cpp     |  4 +-
 .../history/view/history_view_message.h       |  4 ++
 4 files changed, 40 insertions(+), 10 deletions(-)

diff --git a/Telegram/SourceFiles/history/history_item_components.cpp b/Telegram/SourceFiles/history/history_item_components.cpp
index ea31941ff..f732c6d0c 100644
--- a/Telegram/SourceFiles/history/history_item_components.cpp
+++ b/Telegram/SourceFiles/history/history_item_components.cpp
@@ -19,6 +19,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/painter.h"
 #include "history/history.h"
 #include "history/history_message.h"
+#include "history/view/history_view_message.h" // FromNameFg.
 #include "history/view/history_view_service_message.h"
 #include "history/view/media/history_view_document.h"
 #include "core/click_handler_types.h"
@@ -45,6 +46,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 namespace {
 
 const auto kPsaForwardedPrefix = "cloud_lng_forwarded_psa_";
+constexpr auto kReplyBarAlpha = 230. / 255.;
 
 } // namespace
 
@@ -292,8 +294,16 @@ bool HistoryMessageReply::updateData(
 					peerToUser(bot->id));
 			}
 		}
+
+		{
+			const auto peerId = replyToMsg->fullId().peer;
+			replyToColorKey = (peerIsChannel(peerId) || peerIsChat(peerId))
+				? replyToMsg->from()->id
+				: PeerId(0);
+		}
 	} else if (force) {
 		replyToMsgId = 0;
+		replyToColorKey = PeerId(0);
 	}
 	if (force) {
 		holder->history()->owner().requestItemResize(holder);
@@ -422,11 +432,23 @@ void HistoryMessageReply::paint(
 	const auto st = context.st;
 	const auto stm = context.messageStyle();
 
-	const auto &bar = inBubble
-		? stm->msgReplyBarColor
-		: st->msgImgReplyBarColor();
-	QRect rbar(style::rtlrect(x + st::msgReplyBarPos.x(), y + st::msgReplyPadding.top() + st::msgReplyBarPos.y(), st::msgReplyBarSize.width(), st::msgReplyBarSize.height(), w + 2 * x));
-	p.fillRect(rbar, bar);
+	{
+		const auto &bar = !inBubble
+			? st->msgImgReplyBarColor()
+			: replyToColorKey
+			? HistoryView::FromNameFg(context, replyToColorKey)
+			: stm->msgReplyBarColor;
+		const auto rbar = style::rtlrect(
+			x + st::msgReplyBarPos.x(),
+			y + st::msgReplyPadding.top() + st::msgReplyBarPos.y(),
+			st::msgReplyBarSize.width(),
+			st::msgReplyBarSize.height(),
+			w + 2 * x);
+		const auto opacity = p.opacity();
+		p.setOpacity(opacity * kReplyBarAlpha);
+		p.fillRect(rbar, bar);
+		p.setOpacity(opacity);
+	}
 
 	if (w > st::msgReplyBarSkip) {
 		if (replyToMsg) {
@@ -452,9 +474,11 @@ void HistoryMessageReply::paint(
 				}
 			}
 			if (w > st::msgReplyBarSkip + previewSkip) {
-				p.setPen(inBubble
-					? stm->msgServiceFg
-					: st->msgImgReplyBarColor());
+				p.setPen(!inBubble
+					? st->msgImgReplyBarColor()
+					: replyToColorKey
+					? HistoryView::FromNameFg(context, replyToColorKey)
+					: stm->msgServiceFg);
 				replyToName.drawLeftElided(p, x + st::msgReplyBarSkip + previewSkip, y + st::msgReplyPadding.top(), w - st::msgReplyBarSkip - previewSkip, w + 2 * x);
 				if (replyToVia && w > st::msgReplyBarSkip + previewSkip + replyToName.maxWidth() + st::msgServiceFont->spacew) {
 					p.setFont(st::msgServiceFont);
diff --git a/Telegram/SourceFiles/history/history_item_components.h b/Telegram/SourceFiles/history/history_item_components.h
index 0ccb6748e..9e69f3335 100644
--- a/Telegram/SourceFiles/history/history_item_components.h
+++ b/Telegram/SourceFiles/history/history_item_components.h
@@ -240,6 +240,8 @@ struct HistoryMessageReply
 	PeerId replyToPeerId = 0;
 	MsgId replyToMsgId = 0;
 	MsgId replyToMsgTop = 0;
+	using ColorKey = PeerId;
+	ColorKey replyToColorKey = 0;
 	DocumentId replyToDocumentId = 0;
 	WebPageId replyToWebPageId = 0;
 	ReplyToMessagePointer replyToMsg;
diff --git a/Telegram/SourceFiles/history/view/history_view_message.cpp b/Telegram/SourceFiles/history/view/history_view_message.cpp
index d48cff0e2..4b5bf0038 100644
--- a/Telegram/SourceFiles/history/view/history_view_message.cpp
+++ b/Telegram/SourceFiles/history/view/history_view_message.cpp
@@ -225,6 +225,8 @@ QString FastReplyText() {
 	return tr::lng_fast_reply(tr::now);
 }
 
+} // namespace
+
 style::color FromNameFg(
 		const Ui::ChatPaintContext &context,
 		PeerId peerId) {
@@ -256,8 +258,6 @@ style::color FromNameFg(
 	}
 }
 
-} // namespace
-
 struct Message::CommentsButton {
 	std::unique_ptr<Ui::RippleAnimation> ripple;
 	int rippleShift = 0;
diff --git a/Telegram/SourceFiles/history/view/history_view_message.h b/Telegram/SourceFiles/history/view/history_view_message.h
index aac1e775a..23375e7ef 100644
--- a/Telegram/SourceFiles/history/view/history_view_message.h
+++ b/Telegram/SourceFiles/history/view/history_view_message.h
@@ -56,6 +56,10 @@ struct BottomRippleMask {
 	int shift = 0;
 };
 
+[[nodiscard]] style::color FromNameFg(
+	const Ui::ChatPaintContext &context,
+	PeerId peerId);
+
 class Message final : public Element {
 public:
 	Message(