Add dynamic theme switching on Windows 10 (backport)

src/core/Resources.cpp

@@ -142,7 +142,7 @@ QIcon Resources::trayIcon(QString style)
     }
 
     QIcon i;
-#ifdef Q_OS_MACOS
+#if defined(Q_OS_MACOS) || defined(Q_OS_WIN)
     if (osUtils->isStatusBarDark()) {
         i = icon(QString("keepassxc-monochrome-light%1").arg(style), false);
     } else {
@@ -171,7 +171,6 @@ QIcon Resources::trayIconUnlocked()
     return trayIcon("unlocked");
 }
 
-
 AdaptiveIconEngine::AdaptiveIconEngine(QIcon baseIcon)
     : QIconEngine()
     , m_baseIcon(std::move(baseIcon))

src/gui/ApplicationSettingsWidget.cpp

@@ -250,7 +250,7 @@ void ApplicationSettingsWidget::loadSettings()
     }
 
     m_generalUi->trayIconAppearance->clear();
-#ifdef Q_OS_MACOS
+#if defined(Q_OS_MACOS) || defined(Q_OS_WIN)
     m_generalUi->trayIconAppearance->addItem(tr("Monochrome"), "monochrome");
 #else
     m_generalUi->trayIconAppearance->addItem(tr("Monochrome (light)"), "monochrome-light");

src/gui/osutils/winutils/WinUtils.cpp

@@ -30,6 +30,8 @@ WinUtils* WinUtils::instance()
 {
     if (!m_instance) {
         m_instance = new WinUtils(qApp);
+        m_instance->m_darkAppThemeActive = m_instance->isDarkMode();
+        m_instance->m_darkSystemThemeActive = m_instance->isStatusBarDark();
     }
 
     return m_instance;
@@ -66,13 +68,20 @@ bool WinUtils::DWMEventFilter::nativeEventFilter(const QByteArray& eventType, vo
         return false;
     }
     switch (msg->message) {
-    case WM_CREATE:
-    case WM_INITDIALOG: {
-        if (winUtils()->isDarkMode()) {
-            // TODO: indicate dark mode support for black title bar
+    case WM_SETTINGCHANGE:
+        if (m_darkAppThemeActive != isDarkMode()) {
+            m_darkAppThemeActive = !m_darkAppThemeActive;
+            emit interfaceThemeChanged();
+        }
+
+        if (m_darkSystemThemeActive != isStatusBarDark()) {
+            m_darkSystemThemeActive = !m_darkSystemThemeActive;
+            emit statusbarThemeChanged();
         }
         break;
-    }
+    case WM_HOTKEY:
+        triggerGlobalShortcut(msg->wParam);
+        break;
     }
 
     return false;
@@ -87,8 +96,9 @@ bool WinUtils::isDarkMode() const
 
 bool WinUtils::isStatusBarDark() const
 {
-    // TODO: implement
-    return isDarkMode();
+    QSettings settings(R"(HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize)",
+                       QSettings::NativeFormat);
+    return settings.value("SystemUsesLightTheme", 0).toInt() == 0;
 }
 
 bool WinUtils::isLaunchAtStartupEnabled() const

src/gui/osutils/winutils/WinUtils.h

@@ -53,6 +53,9 @@ private:
     static QPointer<WinUtils> m_instance;
     static QScopedPointer<DWMEventFilter> m_eventFilter;
 
+    bool m_darkAppThemeActive;
+    bool m_darkSystemThemeActive;
+
     Q_DISABLE_COPY(WinUtils)
 };