add dark title bar support on windows (#1288)

f3d-app · Feb 14, 2024 · 10dfd8d · 10dfd8d
1 parent 4a525fd
commit 10dfd8d
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diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
@@ -111,6 +111,10 @@ else ()
     $<BUILD_INTERFACE:${F3D_SOURCE_DIR}/external/nlohmann_json>)
 endif ()
 
+if (WIN32)
+  target_link_libraries(libf3d PRIVATE Dwmapi)
+endif()
+
 set_target_properties(libf3d PROPERTIES
   CXX_STANDARD 17
   CXX_VISIBILITY_PRESET hidden

diff --git a/library/src/window_impl.cxx b/library/src/window_impl.cxx
@@ -26,6 +26,17 @@
 #include <vtkExternalOpenGLRenderWindow.h>
 #endif
 
+#ifdef _WIN32
+#include <Windows.h>
+#include <dwmapi.h>
+
+#ifndef DWMWA_USE_IMMERSIVE_DARK_MODE
+#define DWMWA_USE_IMMERSIVE_DARK_MODE 20
+#endif
+
+constexpr auto IMMERSIVE_DARK_MODE_SUPPORTED_SINCE = 19041;
+#endif
+
 namespace f3d::detail
 {
 class window_impl::internals
@@ -44,6 +55,90 @@ class window_impl::internals
     return this->CachePath;
   }
 
+#if _WIN32
+  /**
+   * Helper function to detect if the
+   * Windows Build Number is equal or greater to a number
+   */
+  static bool IsWindowsBuildNumberOrGreater(int buildNumber)
+  {
+    std::string value{};
+    bool result = vtksys::SystemTools::ReadRegistryValue(
+      "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows NT\\CurrentVersion;CurrentBuildNumber",
+      value);
+
+    if (result == true)
+    {
+      try
+      {
+        return std::stoi(value) >= buildNumber;
+      }
+      catch (const std::invalid_argument& e)
+      {
+        f3d::log::debug("Error parsing CurrentBuildNumber", e.what());
+      }
+    }
+    else
+    {
+      f3d::log::debug("Error opening registry key.");
+    }
+
+    return false;
+  }
+
+  /**
+   * Helper function to fetch a DWORD from windows registry.
+   *
+   * @param hKey A handle to an open registry key
+   * @param subKey The path of registry key relative to 'hKey'
+   * @param value The name of the registry value
+   * @param dWord Variable to store the result in
+   */
+  static bool ReadRegistryDWord(
+    HKEY hKey, const std::wstring& subKey, const std::wstring& value, DWORD& dWord)
+  {
+    DWORD dataSize = sizeof(DWORD);
+    LONG result = RegGetValueW(
+      hKey, subKey.c_str(), value.c_str(), RRF_RT_REG_DWORD, nullptr, &dWord, &dataSize);
+
+    return result == ERROR_SUCCESS;
+  }
+
+  /**
+   * Helper function to detect user theme
+   */
+  static bool IsWindowsInDarkMode()
+  {
+    std::wstring subKey(L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize");
+
+    DWORD value{};
+
+    if (ReadRegistryDWord(HKEY_CURRENT_USER, subKey, L"AppsUseLightTheme", value))
+    {
+      return value == 0;
+    }
+
+    if (ReadRegistryDWord(HKEY_CURRENT_USER, subKey, L"SystemUsesLightTheme", value))
+    {
+      return value == 0;
+    }
+
+    return false;
+  }
+#endif
+
+  void UpdateTheme() const
+  {
+#ifdef _WIN32
+    if (this->IsWindowsBuildNumberOrGreater(IMMERSIVE_DARK_MODE_SUPPORTED_SINCE))
+    {
+      HWND hwnd = static_cast<HWND>(this->RenWin->GetGenericWindowId());
+      BOOL useDarkMode = this->IsWindowsInDarkMode();
+      DwmSetWindowAttribute(hwnd, DWMWA_USE_IMMERSIVE_DARK_MODE, &useDarkMode, sizeof(useDarkMode));
+    }
+#endif
+  }
+
   std::unique_ptr<camera_impl> Camera;
   vtkSmartPointer<vtkRenderWindow> RenWin;
   vtkNew<vtkF3DRendererWithColoring> Renderer;
@@ -214,6 +309,7 @@ void window_impl::Initialize(bool withColoring)
 {
   this->Internals->WithColoring = withColoring;
   this->Internals->Renderer->Initialize(this->Internals->Options.getAsString("scene.up-direction"));
+  this->Internals->UpdateTheme();
   this->Internals->Initialized = true;
 }