From 2f59395b8183b1de62bd0ba83685298d9a7e3271 Mon Sep 17 00:00:00 2001
From: Sine Striker <trueful@163.com>
Date: 周四, 21 12月 2023 19:56:42 +0800
Subject: [PATCH] minor tweaks

---
 src/stylesupport/styleagent_win.cpp |   74 ++++++++++++++++++++++++++++++++++++
 1 files changed, 73 insertions(+), 1 deletions(-)

diff --git a/src/stylesupport/styleagent_win.cpp b/src/stylesupport/styleagent_win.cpp
index 7a910d4..a685586 100644
--- a/src/stylesupport/styleagent_win.cpp
+++ b/src/stylesupport/styleagent_win.cpp
@@ -1,19 +1,91 @@
 #include "styleagent_p.h"
 
+#include <QtCore/QSet>
 #include <QtCore/QVariant>
 
 #include <QWKCore/private/qwkwindowsextra_p.h>
+#include <QWKCore/private/nativeeventfilter_p.h>
 
 namespace QWK {
 
+    using StyleAgentSet = QSet<StyleAgentPrivate *>;
+    Q_GLOBAL_STATIC(StyleAgentSet, g_styleAgentSet)
+
+    class SystemSettingEventFilter : public AppNativeEventFilter {
+    public:
+        bool nativeEventFilter(const QByteArray &eventType, void *message,
+                               QT_NATIVE_EVENT_RESULT_TYPE *result) override {
+            Q_UNUSED(eventType)
+            if (!result) {
+                return false;
+            }
+
+            const auto msg = static_cast<const MSG *>(message);
+            switch (msg->message) {
+                case WM_THEMECHANGED:
+                case WM_SYSCOLORCHANGE:
+                case WM_DWMCOLORIZATIONCOLORCHANGED: {
+                    // TODO: walk through `g_styleAgentSet`
+                    break;
+                }
+
+                case WM_SETTINGCHANGE: {
+                    if (!msg->wParam && msg->lParam &&
+                        std::wcscmp(reinterpret_cast<LPCWSTR>(msg->lParam), L"ImmersiveColorSet") ==
+                            0) {
+                        // TODO: walk through `g_styleAgentSet`
+                    }
+                    break;
+                }
+
+                default:
+                    break;
+            }
+            return false;
+        }
+
+        static SystemSettingEventFilter *instance;
+
+        static inline void install() {
+            if (instance) {
+                return;
+            }
+            instance = new SystemSettingEventFilter();
+        }
+
+        static inline void uninstall() {
+            if (!instance) {
+                return;
+            }
+            delete instance;
+            instance = nullptr;
+        }
+    };
+
+    SystemSettingEventFilter *SystemSettingEventFilter::instance = nullptr;
+
     void StyleAgentPrivate::setupSystemThemeHook() {
+        g_styleAgentSet->insert(this);
+        SystemSettingEventFilter::install();
+
+        // Initialize `systemTheme` variable
+    }
+
+    void StyleAgentPrivate::removeSystemThemeHook() {
+        if (!g_styleAgentSet->remove(this))
+            return;
+
+        if (g_styleAgentSet->isEmpty()) {
+            SystemSettingEventFilter::uninstall();
+        }
     }
 
     bool StyleAgentPrivate::updateWindowAttribute(QWindow *window, const QString &key,
                                                   const QVariant &attribute,
                                                   const QVariant &oldAttribute) {
-        const auto hwnd = reinterpret_cast<HWND>(window->winId());
+        Q_UNUSED(oldAttribute)
 
+        const auto hwnd = reinterpret_cast<HWND>(window->winId());
         const DynamicApis &apis = DynamicApis::instance();
 
         if (key == QStringLiteral("frame-shadow")) {

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