[Windows] Remove unnecessary code, implement hasShadow and setHasShadow in frameless mode

README.md

@@ -653,14 +653,14 @@ Makes the window not show in the taskbar / dock.
 Sets progress value in progress bar. Valid range is [0, 1.0].
 
 
-##### hasShadow  `macos`
+##### hasShadow  `macos`  `windows`
 
-Returns `bool` - Whether the window has a shadow.
+Returns `bool` - Whether the window has a shadow. On Windows, always returns true unless window is frameless.
 
 
-##### setHasShadow  `macos`
+##### setHasShadow  `macos`  `windows`
 
-Sets whether the window should have a shadow.
+Sets whether the window should have a shadow. On Windows, doesn't do anything unless window is frameless.
 
 
 ##### getOpacity  `macos`  `windows`

lib/src/window_manager.dart

@@ -531,16 +531,16 @@ class WindowManager {
     await _channel.invokeMethod('setProgressBar', arguments);
   }
 
-  /// Returns `bool` - Whether the window has a shadow.
+  /// Returns `bool` - Whether the window has a shadow. On Windows, always returns true unless window is frameless.
   ///
-  /// @platforms macos
+  /// @platforms macos,windows
   Future<bool> hasShadow() async {
     return await _channel.invokeMethod('hasShadow');
   }
 
-  /// Sets whether the window should have a shadow.
+  /// Sets whether the window should have a shadow. On Windows, doesn't do anything unless window is frameless.
   ///
-  /// @platforms macos
+  /// @platforms macos,windows
   Future<void> setHasShadow(bool hasShadow) async {
     final Map<String, dynamic> arguments = {
       'hasShadow': hasShadow,

windows/window_manager.cpp

@@ -35,6 +35,7 @@ class WindowManager {
 
   int last_state = STATE_NORMAL;
 
+  bool has_shadow_ = false;
   bool is_frameless_ = false;
   bool is_prevent_close_ = false;
   double aspect_ratio_ = 0;
@@ -127,28 +128,12 @@ void WindowManager::SetAsFrameless() {
   HWND hWnd = GetMainWindow();
 
   RECT rect;
-  MARGINS margins = {0, 0, 0, 0};
 
   GetWindowRect(hWnd, &rect);
-  SetWindowLong(hWnd, GWL_STYLE,
-                WS_POPUP | WS_THICKFRAME | WS_CAPTION | WS_SYSMENU |
-                    WS_MAXIMIZEBOX | WS_MINIMIZEBOX | WS_VISIBLE);
-  DwmExtendFrameIntoClientArea(hWnd, &margins);
   SetWindowPos(hWnd, nullptr, rect.left, rect.top, rect.right - rect.left,
                rect.bottom - rect.top,
                SWP_NOZORDER | SWP_NOOWNERZORDER | SWP_NOMOVE | SWP_NOSIZE |
                    SWP_FRAMECHANGED);
-
-  flutter::EncodableMap args = flutter::EncodableMap();
-  args[flutter::EncodableValue("backgroundColorA")] =
-      flutter::EncodableValue(0);
-  args[flutter::EncodableValue("backgroundColorR")] =
-      flutter::EncodableValue(0);
-  args[flutter::EncodableValue("backgroundColorG")] =
-      flutter::EncodableValue(0);
-  args[flutter::EncodableValue("backgroundColorB")] =
-      flutter::EncodableValue(0);
-  SetBackgroundColor(args);
 }
 
 void WindowManager::WaitUntilReadyToShow() {
@@ -569,31 +554,15 @@ void WindowManager::SetTitle(const flutter::EncodableMap& args) {
 void WindowManager::SetTitleBarStyle(const flutter::EncodableMap& args) {
   title_bar_style_ =
       std::get<std::string>(args.at(flutter::EncodableValue("titleBarStyle")));
-
-  HWND hWnd = GetMainWindow();
-  DWORD gwlStyle = GetWindowLong(hWnd, GWL_STYLE);
   // Enables the ability to go from setAsFrameless() to
   // TitleBarStyle.normal/hidden
   is_frameless_ = false;
-  if (title_bar_style_ == "hidden") {
-    gwlStyle = WS_POPUP | WS_THICKFRAME | WS_CAPTION | WS_SYSMENU |
-               WS_MAXIMIZEBOX | WS_MINIMIZEBOX | WS_VISIBLE;
-    SetWindowLong(hWnd, GWL_STYLE, gwlStyle);
-    BOOL composition_enabled = FALSE;
-    bool success = DwmIsCompositionEnabled(&composition_enabled) == S_OK;
-    if (composition_enabled && success) {
-      static const MARGINS shadow_state[2]{{0, 0, 0, 0}, {1, 1, 1, 1}};
-      DwmExtendFrameIntoClientArea(hWnd, &shadow_state[0]);
-      ShowWindow(hWnd, SW_SHOW);
-    }
-  } else {
-    gwlStyle = WS_OVERLAPPEDWINDOW | WS_THICKFRAME | WS_CAPTION | WS_SYSMENU |
-               WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_VISIBLE;
-    SetWindowLong(hWnd, GWL_STYLE, gwlStyle);
-  }
 
+  MARGINS margins = {0, 0, 0, 0};
+  HWND hWnd = GetMainWindow();
   RECT rect;
   GetWindowRect(hWnd, &rect);
+  DwmExtendFrameIntoClientArea(hWnd, &margins);
   SetWindowPos(hWnd, nullptr, rect.left, rect.top, 0, 0,
                SWP_NOZORDER | SWP_NOOWNERZORDER | SWP_NOMOVE | SWP_NOSIZE |
                    SWP_FRAMECHANGED);
@@ -653,6 +622,24 @@ void WindowManager::SetProgressBar(const flutter::EncodableMap& args) {
   }
 }
 
+bool WindowManager::HasShadow() {
+  if (is_frameless_)
+    return has_shadow_;
+  return true;
+}
+
+void WindowManager::SetHasShadow(const flutter::EncodableMap& args) {
+  if (is_frameless_) {
+    has_shadow_ = std::get<bool>(args.at(flutter::EncodableValue("hasShadow")));
+
+    HWND hWnd = GetMainWindow();
+
+    MARGINS margins[2]{{0, 0, 0, 0}, {0, 0, 1, 0}};
+
+    DwmExtendFrameIntoClientArea(hWnd, &margins[has_shadow_]);
+  }
+}
+
 double WindowManager::GetOpacity() {
   return opacity_;
 }

windows/window_manager_plugin.cpp

@@ -109,48 +109,51 @@ std::optional<LRESULT> WindowManagerPlugin::HandleWindowProc(HWND hWnd,
   std::optional<LRESULT> result = std::nullopt;
 
   if (message == WM_NCCALCSIZE) {
+    // This must always be first or else the one of other two ifs will execute
+    //  when window is in full screen and we don't want that
     if (wParam && window_manager->IsFullScreen()) {
       NCCALCSIZE_PARAMS* sz = reinterpret_cast<NCCALCSIZE_PARAMS*>(lParam);
       sz->rgrc[0].bottom -= 3;
-      return (WVR_HREDRAW | WVR_VREDRAW);
+      return 0;
     }
 
+    // This must always be before handling title_bar_style_ == "hidden" so
+    //  the if TitleBarStyle.hidden doesn't get executed.
     if (wParam && window_manager->is_frameless_) {
-      SetWindowLong(hWnd, 0, 0);
       NCCALCSIZE_PARAMS* sz = reinterpret_cast<NCCALCSIZE_PARAMS*>(lParam);
+      // Add borders when maximized so app doesn't get cut off.
       if (window_manager->IsMaximized()) {
         sz->rgrc[0].left += 8;
         sz->rgrc[0].top += 8;
         sz->rgrc[0].right -= 8;
         sz->rgrc[0].bottom -= 9;
       }
+      // This cuts the app at the bottom by one pixel but that's necessary to
+      // prevent jitter when resizing the app
       sz->rgrc[0].bottom += 1;
-      return (WVR_HREDRAW | WVR_VREDRAW);
+      return 0;
     }
 
+    // This must always be last.
     if (wParam && window_manager->title_bar_style_ == "hidden") {
-      WINDOWPLACEMENT wPos;
-      wPos.length = sizeof(wPos);
-      GetWindowPlacement(hWnd, &wPos);
-      RECT borderThickness;
-      SetRectEmpty(&borderThickness);
-      AdjustWindowRectEx(&borderThickness,
-                         GetWindowLongPtr(hWnd, GWL_STYLE) & WS_POPUP, FALSE,
-                         NULL);
       NCCALCSIZE_PARAMS* sz = reinterpret_cast<NCCALCSIZE_PARAMS*>(lParam);
 
       // Add 8 pixel to the top border when maximized so the app isn't cut off
-      // Top resize border is still not working.
       if (window_manager->IsMaximized()) {
         sz->rgrc[0].top += 8;
       } else {
+        // on windows 10, if set to 0, there's a white line at the top
+        // of the app and I've yet to find a way to remove that.
         sz->rgrc[0].top += IsWindows11OrGreater() ? 0 : 1;
       }
       sz->rgrc[0].right -= 8;
       sz->rgrc[0].bottom -= 8;
       sz->rgrc[0].left -= -8;
 
-      return (WVR_HREDRAW | WVR_VREDRAW);
+      // Previously (WVR_HREDRAW | WVR_VREDRAW), but returning 0 or 1 doesn't
+      // actually break anything so I've set it to 0. Unless someone pointed a
+      // problem in the future.
+      return 0;
     }
   } else if (message == WM_NCHITTEST) {
     if (!window_manager->is_resizable_) {
@@ -458,6 +461,14 @@ void WindowManagerPlugin::HandleMethodCall(
         std::get<flutter::EncodableMap>(*method_call.arguments());
     window_manager->SetProgressBar(args);
     result->Success(flutter::EncodableValue(true));
+  } else if (method_name.compare("hasShadow") == 0) {
+    bool value = window_manager->HasShadow();
+    result->Success(flutter::EncodableValue(value));
+  } else if (method_name.compare("setHasShadow") == 0) {
+    const flutter::EncodableMap& args =
+        std::get<flutter::EncodableMap>(*method_call.arguments());
+    window_manager->SetHasShadow(args);
+    result->Success(flutter::EncodableValue(true));
   } else if (method_name.compare("getOpacity") == 0) {
     double value = window_manager->GetOpacity();
     result->Success(flutter::EncodableValue(value));