tauri-apps · amrbashir · Sep 20, 2023 · Sep 20, 2023
diff --git a/.changes/windwos-white-line.md b/.changes/windwos-white-line.md
@@ -0,0 +1,5 @@
+---
+"muda": "patch"
+---
+
+On Windows, draw over the white line under the menubar in dark mode.
diff --git a/examples/wry.rs b/examples/wry.rs
@@ -177,15 +177,25 @@ fn main() -> wry::Result<()> {
  <html>
  <body>
  <style>
+ * {{
+ padding: 0;
+ margin: 0;
+ box-sizing: border-box;
+ font-family: Inter, Avenir, Helvetica, Arial, sans-serif;
+ }}
  main {{
- width: 100vw;
- height: 100vh;
+ width: 100vw;
+ height: 100vh;
+ }}
+ @media (prefers-color-scheme: dark) {{
+ main {{
+ color: #fff;
+ background: #2f2f2f;
+ }}
  }}
  </style>
  <main>
  <h4> WRYYYYYYYYYYYYYYYYYYYYYY! </h4>
- <input />
- <button> Hi </button>
  </main>
  <script>
  window.addEventListener('contextmenu', (e) => {{

diff --git a/src/platform_impl/windows/dark_menu_bar.rs b/src/platform_impl/windows/dark_menu_bar.rs
@@ -4,14 +4,17 @@
 
 // this is a port of combination of https://github.com/hrydgard/ppsspp/blob/master/Windows/W32Util/UAHMenuBar.cpp and https://github.com/ysc3839/win32-darkmode/blob/master/win32-darkmode/DarkMode.h
 
-#![allow(non_snake_case)]
+#![allow(non_snake_case, clippy::upper_case_acronyms)]
 
 use once_cell::sync::Lazy;
 use windows_sys::{
  s, w,
  Win32::{
  Foundation::{HMODULE, HWND, LPARAM, RECT, WPARAM},
- Graphics::Gdi::{OffsetRect, DT_CENTER, DT_HIDEPREFIX, DT_SINGLELINE, DT_VCENTER, HDC},
+ Graphics::Gdi::{
+ GetWindowDC, MapWindowPoints, OffsetRect, ReleaseDC, DT_CENTER, DT_HIDEPREFIX,
+ DT_SINGLELINE, DT_VCENTER, HDC,
+ },
  System::LibraryLoader::{GetProcAddress, LoadLibraryA},
  UI::{
  Accessibility::HIGHCONTRASTA,
@@ -21,8 +24,9 @@ use windows_sys::{
  ODS_GRAYED, ODS_HOTLIGHT, ODS_INACTIVE, ODS_NOACCEL, ODS_SELECTED,
  },
  WindowsAndMessaging::{
- GetMenuBarInfo, GetMenuItemInfoW, GetWindowRect, SystemParametersInfoA, HMENU,
- MENUBARINFO, MENUITEMINFOW, MIIM_STRING, OBJID_MENU, SPI_GETHIGHCONTRAST,
+ GetClientRect, GetMenuBarInfo, GetMenuItemInfoW, GetWindowRect,
+ SystemParametersInfoA, HMENU, MENUBARINFO, MENUITEMINFOW, MIIM_STRING, OBJID_MENU,
+ SPI_GETHIGHCONTRAST, WM_NCACTIVATE, WM_NCPAINT,
  },
  },
  },
@@ -69,12 +73,49 @@ struct UAHDRAWMENUITEM {
 }
 
 /// Draws a dark menu bar if needed and returns whether it draws it or not
-pub fn draw(hwnd: HWND, msg: u32, _wparam: WPARAM, lparam: LPARAM) -> bool {
- if !should_use_dark_mode(hwnd) {
- return false;
- }
-
+pub fn draw(hwnd: HWND, msg: u32, _wparam: WPARAM, lparam: LPARAM) {
  match msg {
+ // draw over the annoying white line blow menubar
+ // ref: https://github.com/notepad-plus-plus/notepad-plus-plus/pull/9985
+ WM_NCACTIVATE | WM_NCPAINT => {
+ let mut mbi = MENUBARINFO {
+ cbSize: std::mem::size_of::<MENUBARINFO>() as _,
+ ..unsafe { std::mem::zeroed() }
+ };
+ unsafe { GetMenuBarInfo(hwnd, OBJID_MENU, 0, &mut mbi) };
+
+ let mut client_rc: RECT = unsafe { std::mem::zeroed() };
+ unsafe {
+ GetClientRect(hwnd, &mut client_rc);
+ MapWindowPoints(hwnd, 0, &mut client_rc as *mut _ as *mut _, 2);
+ };
+
+ let mut window_rc: RECT = unsafe { std::mem::zeroed() };
+ unsafe { GetWindowRect(hwnd, &mut window_rc) };
+
+ unsafe { OffsetRect(&mut client_rc, -window_rc.left, -window_rc.top) };
+
+ let mut annoying_rc = client_rc;
+ annoying_rc.bottom = annoying_rc.top;
+ annoying_rc.top -= 1;
+
+ unsafe {
+ let theme = OpenThemeData(hwnd, w!("Menu"));
+ let hdc = GetWindowDC(hwnd);
+ DrawThemeBackground(
+ theme,
+ hdc,
+ MENU_POPUPITEM,
+ MPI_NORMAL,
+ &annoying_rc,
+ std::ptr::null(),
+ );
+ ReleaseDC(hwnd, hdc);
+ CloseThemeData(theme);
+ }
+ }
+
+ // draw menu bar background
  WM_UAHDRAWMENU => {
  let pudm = lparam as *const UAHMENU;
 
@@ -86,9 +127,7 @@ pub fn draw(hwnd: HWND, msg: u32, _wparam: WPARAM, lparam: LPARAM) -> bool {
  };
  unsafe { GetMenuBarInfo(hwnd, OBJID_MENU, 0, &mut mbi) };
 
- let mut window_rc = RECT {
- ..unsafe { std::mem::zeroed() }
- };
+ let mut window_rc: RECT = unsafe { std::mem::zeroed() };
  unsafe { GetWindowRect(hwnd, &mut window_rc) };
 
  let mut rc = mbi.rcBar;
@@ -100,7 +139,6 @@ pub fn draw(hwnd: HWND, msg: u32, _wparam: WPARAM, lparam: LPARAM) -> bool {
 
  unsafe {
  let theme = OpenThemeData(hwnd, w!("Menu"));
-
  DrawThemeBackground(
  theme,
  (*pudm).hdc,
@@ -113,6 +151,7 @@ pub fn draw(hwnd: HWND, msg: u32, _wparam: WPARAM, lparam: LPARAM) -> bool {
  }
  }
 
+ // draw menu bar items
  WM_UAHDRAWMENUITEM => {
  let pudmi = lparam as *const UAHDRAWMENUITEM;
 
@@ -194,13 +233,11 @@ pub fn draw(hwnd: HWND, msg: u32, _wparam: WPARAM, lparam: LPARAM) -> bool {
  }
  }
 
- _ => return false,
+ _ => {}
  };
-
- true
 }
 
-fn should_use_dark_mode(hwnd: HWND) -> bool {
+pub fn should_use_dark_mode(hwnd: HWND) -> bool {
  should_apps_use_dark_mode() && !is_high_contrast() && is_dark_mode_allowed_for_window(hwnd)
 }
 

diff --git a/src/platform_impl/windows/mod.rs b/src/platform_impl/windows/mod.rs
@@ -38,7 +38,7 @@ use windows_sys::Win32::{
  HMENU, MENUITEMINFOW, MFS_CHECKED, MFS_DISABLED, MF_BYCOMMAND, MF_BYPOSITION,
  MF_CHECKED, MF_DISABLED, MF_ENABLED, MF_GRAYED, MF_POPUP, MF_SEPARATOR, MF_STRING,
  MF_UNCHECKED, MIIM_BITMAP, MIIM_STATE, MIIM_STRING, SW_HIDE, SW_MAXIMIZE, SW_MINIMIZE,
- TPM_LEFTALIGN, WM_CLOSE, WM_COMMAND,
+ TPM_LEFTALIGN, WM_CLOSE, WM_COMMAND, WM_NCACTIVATE, WM_NCPAINT,
  },
  },
 };
@@ -1070,7 +1070,6 @@ unsafe extern "system" fn menu_subclass_proc(
  uidsubclass: usize,
  dwrefdata: usize,
 ) -> LRESULT {
- let mut ret = None;
  match msg {
  WM_COMMAND => {
  let id = util::LOWORD(wparam as _) as u32;
@@ -1083,8 +1082,6 @@ unsafe extern "system" fn menu_subclass_proc(
  };
 
  if let Some(item) = item {
- ret = Some(0);
-
  let (mut dispatch, mut menu_id) = (true, None);
 
  {
@@ -1149,22 +1146,32 @@ unsafe extern "system" fn menu_subclass_proc(
  id: menu_id.unwrap(),
  });
  }
+
+ 0
+ } else {
+ DefSubclassProc(hwnd, msg, wparam, lparam)
  }
  }
 
  WM_UAHDRAWMENUITEM | WM_UAHDRAWMENU => {
- if dark_menu_bar::draw(hwnd, msg, wparam, lparam) {
- ret = Some(0);
+ if dark_menu_bar::should_use_dark_mode(hwnd) {
+ dark_menu_bar::draw(hwnd, msg, wparam, lparam);
+ 0
+ } else {
+ DefSubclassProc(hwnd, msg, wparam, lparam)
  }
  }
+ WM_NCACTIVATE | WM_NCPAINT => {
+ // DefSubclassProc needs to be called before calling the
+ // custom dark menu redraw
+ let res = DefSubclassProc(hwnd, msg, wparam, lparam);
+ if dark_menu_bar::should_use_dark_mode(hwnd) {
+ dark_menu_bar::draw(hwnd, msg, wparam, lparam);
+ }
+ res
+ }
 
- _ => {}
- };
-
- if let Some(ret) = ret {
- ret
- } else {
- DefSubclassProc(hwnd, msg, wparam, lparam)
+ _ => DefSubclassProc(hwnd, msg, wparam, lparam),
  }
 }