From a2c1489ffb0d70a13ad3c60032a08da8b6107486 Mon Sep 17 00:00:00 2001
From: Nishi <nishi@nishi.boats>
Date: Thu, 16 Apr 2026 09:35:53 +0900
Subject: [PATCH] add MwLLSetDarkTheme

---
 include/Mw/LowLevel.h |  2 ++
 src/backend/call.c    |  2 ++
 src/backend/cocoa.m   |  5 +++++
 src/backend/gdi.c     | 27 +++++++++++++++++++++++++++
 src/backend/wayland.c |  5 +++++
 src/backend/x11.c     |  7 ++++++-
 src/core.c            |  8 ++++++++
 src/lowlevel.c        |  2 ++
 8 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/include/Mw/LowLevel.h b/include/Mw/LowLevel.h
index c958e00..a1a4691 100644
--- a/include/Mw/LowLevel.h
+++ b/include/Mw/LowLevel.h
@@ -277,6 +277,8 @@ MWDECL void (*MwLLGetClipboard)(MwLL handle);
 MWDECL void (*MwLLGetCursorCoord)(MwLL handle, MwPoint* point);
 MWDECL void (*MwLLGetScreenSize)(MwLL handle, MwRect* rect);
 
+MWDECL void (*MwLLSetDarkTheme)(MwLL handle, int toggle);
+
 /* font renderer */
 MWDECL void MwFLSetup(void);
 
diff --git a/src/backend/call.c b/src/backend/call.c
index e2ce934..07cf1e0 100644
--- a/src/backend/call.c
+++ b/src/backend/call.c
@@ -54,6 +54,8 @@
 \
 		MwLLGetCursorCoord = MwLLGetCursorCoordImpl; \
 		MwLLGetScreenSize  = MwLLGetScreenSizeImpl; \
+\
+		MwLLSetDarkTheme  = MwLLSetDarkThemeImpl; \
 \
 		return 0; \
 	}
diff --git a/src/backend/cocoa.m b/src/backend/cocoa.m
index 4cdc5b2..95fd56d 100644
--- a/src/backend/cocoa.m
+++ b/src/backend/cocoa.m
@@ -1082,6 +1082,11 @@ static void MwLLEndStateChangeImpl(MwLL handle) {
 	MwLLShow(handle, 1);
 }
 
+static void MwLLSetDarkThemeImpl(MwLL handle, int toggle){
+	(void)handle;
+	(void)toggle;
+}
+
 static int MwLLCocoaCallInitImpl(void) {
 #ifndef __APPLE__
 	printf("Using GNUStep Backend\n");
diff --git a/src/backend/gdi.c b/src/backend/gdi.c
index 5d89419..9fe1398 100644
--- a/src/backend/gdi.c
+++ b/src/backend/gdi.c
@@ -8,6 +8,14 @@ typedef struct userdata {
 	int   max_set;
 } userdata_t;
 
+static struct symtbl {
+	void* lib_dwmapi;
+
+	HRESULT (WINAPI *DwmSetWindowAttribute)(HWND hwnd, DWORD dwAttribute, LPCVOID pvAttribute, DWORD cbAttribute);
+} wsymtbl;
+
+#define DwmSetWindowAttribute wsymtbl.DwmSetWindowAttribute
+
 static void detect_darktheme(MwLL handle) {
 	DWORD dw;
 	DWORD sz = sizeof(dw);
@@ -26,6 +34,12 @@ static void detect_darktheme(MwLL handle) {
 
 	t = dw ? 0 : 1;
 
+	if(t && DwmSetWindowAttribute != NULL){
+		LPARAM style = GetWindowLongPtr(handle->gdi.hWnd, GWL_STYLE);
+		BOOL v = TRUE;
+		if(!(style & WS_CHILD)) DwmSetWindowAttribute(handle->gdi.hWnd, 20, &v, sizeof(v));
+	}
+
 	MwLLDispatch(handle, dark_theme, &t);
 }
 
@@ -804,7 +818,20 @@ static void MwLLEndStateChangeImpl(MwLL handle) {
 	(void)handle;
 }
 
+static void MwLLSetDarkThemeImpl(MwLL handle, int toggle){
+	BOOL v = toggle ? TRUE : FALSE;
+
+	DwmSetWindowAttribute(handle->gdi.hWnd, 20, &v, sizeof(v));
+
+}
+
 static int MwLLGDICallInitImpl(void) {
+	memset(&wsymtbl, 0, sizeof(wsymtbl));
+
+	wsymtbl.lib_dwmapi = MwDynamicOpen("dwmapi.dll");
+
+	if(wsymtbl.lib_dwmapi != NULL) DwmSetWindowAttribute = MwDynamicSymbol(wsymtbl.lib_dwmapi, "DwmSetWindowAttribute");
+
 	/* TODO: check properly */
 	return 0;
 }
diff --git a/src/backend/wayland.c b/src/backend/wayland.c
index 1fc68cb..bd46860 100644
--- a/src/backend/wayland.c
+++ b/src/backend/wayland.c
@@ -2620,6 +2620,11 @@ static void MwLLEndStateChangeImpl(MwLL handle) {
 	}
 }
 
+static void MwLLSetDarkThemeImpl(MwLL handle, int toggle){
+	(void)handle;
+	(void)toggle;
+}
+
 static int MwLLWaylandCallInitImpl(void) {
 #ifdef __linux__
 	MwBool loadWayland = MwFALSE;
diff --git a/src/backend/x11.c b/src/backend/x11.c
index d8f028b..dcc41d7 100644
--- a/src/backend/x11.c
+++ b/src/backend/x11.c
@@ -4,7 +4,7 @@
 
 #define ClipboardTimeout 100
 
-static struct {
+static struct symtbl {
 	void*  lib_xlib;
 	void*  lib_xrender;
 	MwBool has_xrender;
@@ -1308,6 +1308,11 @@ static void MwLLEndStateChangeImpl(MwLL handle) {
 	MwLLShow(handle, 1);
 }
 
+static void MwLLSetDarkThemeImpl(MwLL handle, int toggle){
+	(void)handle;
+	(void)toggle;
+}
+
 static int MwLLX11CallInitImpl(void) {
 	MwBool loadX11 = MwFALSE;
 	if(getenv("MILSKO_BACKEND")) {
diff --git a/src/core.c b/src/core.c
index cf45ddd..1b00615 100644
--- a/src/core.c
+++ b/src/core.c
@@ -532,6 +532,14 @@ void MwSetInteger(MwWidget handle, const char* key, int n) {
 	if(strcmp(key, MwNmodernLook) == 0 || strcmp(key, MwNdarkTheme) == 0 || strcmp(key, MwNbitmapFont) == 0) {
 		force_render_all(handle);
 	}
+
+	if(strcmp(key, MwNdarkTheme) == 0){
+		MwWidget h = handle;
+
+		while(h->parent != NULL && h->parent->widget_class != NULL) h = h->parent;
+
+		MwLLSetDarkTheme(h->lowlevel, n);
+	}
 }
 
 void MwSetText(MwWidget handle, const char* key, const char* value) {
diff --git a/src/lowlevel.c b/src/lowlevel.c
index 13a7d49..e80b95b 100644
--- a/src/lowlevel.c
+++ b/src/lowlevel.c
@@ -51,6 +51,8 @@ void (*MwLLGetClipboard)(MwLL handle)			= NULL;
 void (*MwLLGetCursorCoord)(MwLL handle, MwPoint* point) = NULL;
 void (*MwLLGetScreenSize)(MwLL handle, MwRect* rect)	= NULL;
 
+void (*MwLLSetDarkTheme)(MwLL handle, int toggle) = NULL;
+
 void MwLLCreateCommon(MwLL handle) {
 	handle->common.handler = malloc(sizeof(*handle->common.handler));
 	memset(handle->common.handler, 0, sizeof(*handle->common.handler));