From 4dbc543cd3d5df30430d060e5db11990b424ca9d Mon Sep 17 00:00:00 2001
From: evgeny <evgeny@adaptto.ru>
Date: Wed, 21 Oct 2026 13:21:30 +0200
Subject: [PATCH] Increase contrast of chat scrollbar thumb only

---
 tools/chatgui/src/chatview.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/chatgui/src/chatview.cpp b/tools/chatgui/src/chatview.cpp
index c4e6aa07..36349e82 100644
--- a/tools/chatgui/src/chatview.cpp
+++ b/tools/chatgui/src/chatview.cpp
@@ -9,6 +9,23 @@
 #include <QMouseEvent>
 #include <QKeyEvent>
 #include <QScrollBar>
+#include <QStyleOptionSlider>
+
+/* Перерисовываем светлее только ползунок; дорожку и стрелки рисует стандартный стиль. */
+class HistoryScrollBar : public QScrollBar {
+public:
+    using QScrollBar::QScrollBar;
+protected:
+    void paintEvent(QPaintEvent* event) override {
+        QScrollBar::paintEvent(event);
+        QStyleOptionSlider option; initStyleOption(&option);
+        option.subControls = QStyle::SC_ScrollBarSlider;
+        option.palette.setColor(QPalette::Button, QColor(80, 80, 80));
+        QPainter painter(this);
+        painter.setClipRect(style()->subControlRect(QStyle::CC_ScrollBar, &option, QStyle::SC_ScrollBarSlider, this));
+        style()->drawComplexControl(QStyle::CC_ScrollBar, &option, &painter, this);
+    }
+};
 
 // Текст и реакции сообщения используют общий набор анимированных значков.
 static QSet<QString> animatedEmojiPaths(const QModelIndex &index) {
@@ -28,6 +45,8 @@ ChatView::ChatView(QWidget *parent)
     : QListView(parent)
 {
     setMouseTracking(true);
+    setVerticalScrollBar(new HistoryScrollBar(Qt::Vertical, this));
+    GUI_DEBUG("history scrollbar: native style with thumb button color=#505050");
 
     m_scrollDownBtn = new QPushButton(QStringLiteral("\u25BC"), this);
     m_scrollDownBtn->setFixedSize(36, 36);