feat: win32 enable dark titlebar for dark theme

Signed-off-by: DavidoTek <54072917+DavidoTek@users.noreply.github.com>

launcher/ui/WinDarkmode.cpp

@@ -0,0 +1,32 @@
+#include <QWidget>
+
+#include "WinDarkmode.h"
+
+namespace WinDarkmode {
+
+/* See https://github.com/statiolake/neovim-qt/commit/da8eaba7f0e38b6b51f3bacd02a8cc2d1f7a34d8 */
+void setDarkWinTitlebar(WId winid, bool darkmode)
+{
+    HWND hwnd = reinterpret_cast<HWND>(winid);
+    BOOL dark = (BOOL) darkmode;
+
+    HMODULE hUxtheme = LoadLibraryExW(L"uxtheme.dll", NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
+    HMODULE hUser32 = GetModuleHandleW(L"user32.dll");
+    fnAllowDarkModeForWindow AllowDarkModeForWindow
+        = reinterpret_cast<fnAllowDarkModeForWindow>(GetProcAddress(hUxtheme, MAKEINTRESOURCEA(133)));
+    fnSetPreferredAppMode SetPreferredAppMode
+        = reinterpret_cast<fnSetPreferredAppMode>(GetProcAddress(hUxtheme, MAKEINTRESOURCEA(135)));
+    fnSetWindowCompositionAttribute SetWindowCompositionAttribute
+        = reinterpret_cast<fnSetWindowCompositionAttribute>(GetProcAddress(hUser32, "SetWindowCompositionAttribute"));
+
+    SetPreferredAppMode(AllowDark);
+    AllowDarkModeForWindow(hwnd, dark);
+    WINDOWCOMPOSITIONATTRIBDATA data = {
+        WCA_USEDARKMODECOLORS,
+        &dark,
+        sizeof(dark)
+    };
+    SetWindowCompositionAttribute(hwnd, &data);
+}
+
+}

launcher/ui/WinDarkmode.h

@@ -0,0 +1,60 @@
+#pragma once
+
+#include <windows.h>
+#include <dwmapi.h>
+
+
+namespace WinDarkmode {
+
+void setDarkWinTitlebar(WId winid, bool darkmode);
+
+enum PreferredAppMode {
+    Default,
+    AllowDark,
+    ForceDark,
+    ForceLight,
+    Max
+};
+
+enum WINDOWCOMPOSITIONATTRIB {
+    WCA_UNDEFINED = 0,
+    WCA_NCRENDERING_ENABLED = 1,
+    WCA_NCRENDERING_POLICY = 2,
+    WCA_TRANSITIONS_FORCEDISABLED = 3,
+    WCA_ALLOW_NCPAINT = 4,
+    WCA_CAPTION_BUTTON_BOUNDS = 5,
+    WCA_NONCLIENT_RTL_LAYOUT = 6,
+    WCA_FORCE_ICONIC_REPRESENTATION = 7,
+    WCA_EXTENDED_FRAME_BOUNDS = 8,
+    WCA_HAS_ICONIC_BITMAP = 9,
+    WCA_THEME_ATTRIBUTES = 10,
+    WCA_NCRENDERING_EXILED = 11,
+    WCA_NCADORNMENTINFO = 12,
+    WCA_EXCLUDED_FROM_LIVEPREVIEW = 13,
+    WCA_VIDEO_OVERLAY_ACTIVE = 14,
+    WCA_FORCE_ACTIVEWINDOW_APPEARANCE = 15,
+    WCA_DISALLOW_PEEK = 16,
+    WCA_CLOAK = 17,
+    WCA_CLOAKED = 18,
+    WCA_ACCENT_POLICY = 19,
+    WCA_FREEZE_REPRESENTATION = 20,
+    WCA_EVER_UNCLOAKED = 21,
+    WCA_VISUAL_OWNER = 22,
+    WCA_HOLOGRAPHIC = 23,
+    WCA_EXCLUDED_FROM_DDA = 24,
+    WCA_PASSIVEUPDATEMODE = 25,
+    WCA_USEDARKMODECOLORS = 26,
+    WCA_LAST = 27
+};
+
+struct WINDOWCOMPOSITIONATTRIBDATA {
+    WINDOWCOMPOSITIONATTRIB Attrib;
+    PVOID pvData;
+    SIZE_T cbData;
+};
+
+using fnAllowDarkModeForWindow =  BOOL (WINAPI *)(HWND hWnd, BOOL allow);
+using fnSetPreferredAppMode = PreferredAppMode (WINAPI *)(PreferredAppMode appMode);
+using fnSetWindowCompositionAttribute =  BOOL (WINAPI *)(HWND hwnd, WINDOWCOMPOSITIONATTRIBDATA *);
+
+}