From f8c26bb6a3af683d34d8a55f95ae53fd7eccece8 Mon Sep 17 00:00:00 2001
From: gongheng <gongheng@uniontech.com>
Date: Fri, 30 Oct 2026 04:22:15 +0800
Subject: [PATCH] fix: use theme-aware color for magnifier background
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1. Root cause: BrowserMagniFier::setMagniFierImage() hardcoded
   Qt::white to fill magnifier center when image is null, which
   does not adapt to dark mode
2. Fix: replace Qt::white with DGuiApplicationHelper palette
   itemBackground color, consistent with SheetBrowser.cpp:72
3. Impact: magnifier center now follows system theme in dark mode,
   no behavior change for light mode users

Log: Fix magnifier background color not adapting to dark mode

Influence:
1. Test magnifier on non-content area in light mode
2. Test magnifier on non-content area in dark mode
3. Verify magnifier still shows page content correctly

fix: 放大镜背景色适配深色模式

1. 根因：BrowserMagniFier::setMagniFierImage() 在图像为空时
   硬编码 Qt::white 填充放大镜中心，不随系统主题变化
2. 方案：将 Qt::white 替换为 DGuiApplicationHelper 调色板
   itemBackground 颜色，与 SheetBrowser.cpp:72 保持一致
3. 影响：深色模式下放大镜中心跟随主题，浅色模式无行为变化

Log: 修复放大镜背景色不适配深色模式的问题

Influence:
1. 浅色模式下放大镜移至非内容区域测试
2. 深色模式下放大镜移至非内容区域测试
3. 验证放大镜正常显示页面内容无回归

Bug: #193251
---
 reader/browser/BrowserMagniFier.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/reader/browser/BrowserMagniFier.cpp b/reader/browser/BrowserMagniFier.cpp
index 1db316097..186a258f5 100644
--- a/reader/browser/BrowserMagniFier.cpp
+++ b/reader/browser/BrowserMagniFier.cpp
@@ -1,5 +1,5 @@
 // Copyright (C) 2019 ~ 2020 Uniontech Software Technology Co.,Ltd.
-// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2023-2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -16,6 +16,8 @@
 #include <QMetaObject>
 #include <QPainterPath>
 
+#include <DGuiApplicationHelper>
+
 ReadMagnifierManager::ReadMagnifierManager(QWidget *parent) : QThread(parent)
 {
     // qCDebug(appLog) << "ReadMagnifierManager created";
@@ -204,7 +206,7 @@ void BrowserMagniFier::setMagniFierImage(const QImage &image)
         painter.drawImage(0, 0, im.scaled(static_cast<int>(240 * dApp->devicePixelRatio()), static_cast<int>(240 * dApp->devicePixelRatio()), Qt::KeepAspectRatio, Qt::SmoothTransformation));
     } else {
         // qCDebug(appLog) << "BrowserMagniFier::setMagniFierImage() - Drawing white background for null image";
-        painter.fillRect(this->rect(), Qt::white);
+        painter.fillRect(this->rect(), DGuiApplicationHelper::instance()->applicationPalette().itemBackground().color());
     }
     painter.restore();