feat(macos): Fix with_titlebar_transparent, add WindowExtMacOS::set_titlebar_transparent

.changes/fix-titlebar-transparent copy.md

@@ -0,0 +1,5 @@
+---
+"tao": patch
+---
+
+Add macOS `WindowExtMacOS::set_titlebar_transparent`

.changes/fix-titlebar-transparent.md

@@ -0,0 +1,5 @@
+---
+"tao": patch
+---
+
+Fix macOS `WindowBuilderExtMacOS::with_titlebar_transparent`

src/platform/macos.rs

@@ -49,6 +49,9 @@ pub trait WindowExtMacOS {
   /// space or taking control over the entire monitor.
   fn set_simple_fullscreen(&self, fullscreen: bool) -> bool;
 
+  /// Makes the titlebar transparent and allows the content to appear behind it.
+  fn set_titlebar_transparent(&self, transparent: bool);
+
   /// Returns whether or not the window has shadow.
   fn has_shadow(&self) -> bool;
 
@@ -77,6 +80,11 @@ impl WindowExtMacOS for Window {
     self.window.set_simple_fullscreen(fullscreen)
   }
 
+  #[inline]
+  fn set_titlebar_transparent(&self, transparent: bool) {
+    self.window.set_titlebar_transparent(transparent)
+  }
+
   #[inline]
   fn has_shadow(&self) -> bool {
     self.window.has_shadow()

src/platform_impl/macos/window.rs

@@ -205,6 +205,13 @@ fn create_window(
       ns_window.setAcceptsMouseMovedEvents_(YES);
 
       if pl_attrs.titlebar_transparent {
+        let mut style_mask = ns_window.styleMask();
+        style_mask.set(
+          NSWindowStyleMask::NSFullSizeContentViewWindowMask,
+          true,
+        );
+        ns_window.setStyleMask_(style_mask);
+
         ns_window.setTitlebarAppearsTransparent_(YES);
       }
       if pl_attrs.title_hidden {
@@ -1233,6 +1240,21 @@ impl WindowExtMacOS for UnownedWindow {
         .setHasShadow_(if has_shadow { YES } else { NO })
     }
   }
+
+  #[inline]
+  fn set_titlebar_transparent(&self, transparent: bool) {
+    unsafe {
+      let id = self.ns_window() as cocoa::base::id;
+      let mut style_mask = id.styleMask();
+      style_mask.set(
+        NSWindowStyleMask::NSFullSizeContentViewWindowMask,
+        transparent,
+      );
+      self.ns_window.setStyleMask_(style_mask);
+
+      id.setTitlebarAppearsTransparent_(if transparent { YES } else { NO });
+    }
+  }
 }
 
 impl Drop for UnownedWindow {