Add some missing Window getters

Implemented properly when it was easy for me, but a lot of places are
stubbed out for now.

winit-appkit/src/window.rs

@@ -3,7 +3,7 @@
 use std::sync::Arc;
 
 use dispatch2::MainThreadBound;
-use dpi::{Position, Size};
+use dpi::{PhysicalSize, Position, Size};
 use objc2::rc::{autoreleasepool, Retained};
 use objc2::{define_class, MainThreadMarker, Message};
 use objc2_app_kit::{NSPanel, NSResponder, NSWindow};
@@ -141,10 +141,18 @@ impl CoreWindow for Window {
         self.maybe_wait_on_main(|delegate| delegate.safe_area())
     }
 
+    fn min_surface_size(&self) -> Option<PhysicalSize<u32>> {
+        self.maybe_wait_on_main(|delegate| delegate.min_surface_size())
+    }
+
     fn set_min_surface_size(&self, min_size: Option<Size>) {
         self.maybe_wait_on_main(|delegate| delegate.set_min_surface_size(min_size))
     }
 
+    fn max_surface_size(&self) -> Option<PhysicalSize<u32>> {
+        self.maybe_wait_on_main(|delegate| delegate.max_surface_size())
+    }
+
     fn set_max_surface_size(&self, max_size: Option<Size>) {
         self.maybe_wait_on_main(|delegate| delegate.set_max_surface_size(max_size));
     }
@@ -161,10 +169,18 @@ impl CoreWindow for Window {
         self.maybe_wait_on_main(|delegate| delegate.set_title(title));
     }
 
+    fn is_transparent(&self) -> bool {
+        self.maybe_wait_on_main(|delegate| delegate.is_transparent())
+    }
+
     fn set_transparent(&self, transparent: bool) {
         self.maybe_wait_on_main(|delegate| delegate.set_transparent(transparent));
     }
 
+    fn is_blurred(&self) -> bool {
+        self.maybe_wait_on_main(|delegate| delegate.is_blurred())
+    }
+
     fn set_blur(&self, blur: bool) {
         self.maybe_wait_on_main(|delegate| delegate.set_blur(blur));
     }
@@ -225,10 +241,18 @@ impl CoreWindow for Window {
         self.maybe_wait_on_main(|delegate| delegate.is_decorated())
     }
 
+    fn window_level(&self) -> WindowLevel {
+        self.maybe_wait_on_main(|delegate| delegate.window_level())
+    }
+
     fn set_window_level(&self, level: WindowLevel) {
         self.maybe_wait_on_main(|delegate| delegate.set_window_level(level));
     }
 
+    fn window_icon(&self) -> Option<Icon> {
+        self.maybe_wait_on_main(|delegate| delegate.window_icon())
+    }
+
     fn set_window_icon(&self, window_icon: Option<Icon>) {
         self.maybe_wait_on_main(|delegate| delegate.set_window_icon(window_icon));
     }
@@ -261,6 +285,10 @@ impl CoreWindow for Window {
         self.maybe_wait_on_main(|delegate| delegate.theme())
     }
 
+    fn content_protected(&self) -> bool {
+        self.maybe_wait_on_main(|delegate| delegate.content_protected())
+    }
+
     fn set_content_protected(&self, protected: bool) {
         self.maybe_wait_on_main(|delegate| delegate.set_content_protected(protected));
     }
@@ -269,6 +297,10 @@ impl CoreWindow for Window {
         self.maybe_wait_on_main(|delegate| delegate.title())
     }
 
+    fn cursor(&self) -> Cursor {
+        self.maybe_wait_on_main(|delegate| delegate.cursor())
+    }
+
     fn set_cursor(&self, cursor: Cursor) {
         self.maybe_wait_on_main(|delegate| delegate.set_cursor(cursor));
     }

winit-appkit/src/window_delegate.rs

@@ -934,6 +934,10 @@ impl WindowDelegate {
         self.window().setTitle(&NSString::from_str(title))
     }
 
+    pub fn is_transparent(&self) -> bool {
+        unsafe { !self.window().isOpaque() }
+    }
+
     pub fn set_transparent(&self, transparent: bool) {
         // This is just a hint for Quartz, it doesn't actually speculate with window alpha.
         // Providing a wrong value here could result in visual artifacts, when the window is
@@ -954,6 +958,12 @@ impl WindowDelegate {
         self.window().setBackgroundColor(Some(&color));
     }
 
+    pub fn is_blurred(&self) -> bool {
+        // What API would we use to get this? `CGSGetWindowBackgroundBlurRadius` doesn't exist.
+        warn!("getting the background blur of the window is not supported on macOS");
+        false
+    }
+
     pub fn set_blur(&self, blur: bool) {
         // NOTE: in general we want to specify the blur radius, but the choice of 80
         // should be a reasonable default.
@@ -1073,6 +1083,14 @@ impl WindowDelegate {
         None
     }
 
+    pub fn min_surface_size(&self) -> Option<PhysicalSize<u32>> {
+        let size = unsafe { self.window().contentMinSize() };
+        if size == NSSize::ZERO {
+            return None;
+        }
+        Some(LogicalSize::new(size.width, size.height).to_physical(self.scale_factor()))
+    }
+
     pub fn set_min_surface_size(&self, dimensions: Option<Size>) {
         let dimensions =
             dimensions.unwrap_or(Size::Logical(LogicalSize { width: 0.0, height: 0.0 }));
@@ -1092,6 +1110,15 @@ impl WindowDelegate {
         self.window().setContentSize(current_size);
     }
 
+    pub fn max_surface_size(&self) -> Option<PhysicalSize<u32>> {
+        let size = unsafe { self.window().contentMaxSize() };
+        // AppKit sets the max size to f32::MAX by default.
+        if size == NSSize::new(f32::MAX as _, f32::MAX as _) {
+            return None;
+        }
+        Some(LogicalSize::new(size.width, size.height).to_physical(self.scale_factor()))
+    }
+
     pub fn set_max_surface_size(&self, dimensions: Option<Size>) {
         let dimensions = dimensions.unwrap_or(Size::Logical(LogicalSize {
             width: f32::MAX as f64,
@@ -1213,6 +1240,11 @@ impl WindowDelegate {
         buttons
     }
 
+    pub fn cursor(&self) -> Cursor {
+        warn!("getting the cursor is unimplemented on macOS");
+        Cursor::default()
+    }
+
     pub fn set_cursor(&self, cursor: Cursor) {
         let view = self.view();
 
@@ -1643,6 +1675,20 @@ impl WindowDelegate {
         self.ivars().decorations.get()
     }
 
+    pub fn window_level(&self) -> WindowLevel {
+        let level = unsafe { self.window().level() };
+        if level == kCGFloatingWindowLevel as NSWindowLevel {
+            WindowLevel::AlwaysOnTop
+        } else if level == (kCGNormalWindowLevel - 1) as NSWindowLevel {
+            WindowLevel::AlwaysOnBottom
+        } else if level == kCGNormalWindowLevel as NSWindowLevel {
+            WindowLevel::Normal
+        } else {
+            warn!(?level, "cannot determine window level, it must've been set outside of Winit");
+            WindowLevel::default()
+        }
+    }
+
     #[inline]
     pub fn set_window_level(&self, level: WindowLevel) {
         // Note: There are two different things at play here:
@@ -1662,6 +1708,11 @@ impl WindowDelegate {
         self.window().setLevel(level);
     }
 
+    #[inline]
+    pub fn window_icon(&self) -> Option<Icon> {
+        None
+    }
+
     #[inline]
     pub fn set_window_icon(&self, _icon: Option<Icon>) {
         // macOS doesn't have window icons. Though, there is
@@ -1815,6 +1866,17 @@ impl WindowDelegate {
         unsafe { self.window().setAppearance(theme_to_appearance(theme).as_deref()) };
     }
 
+    pub fn content_protected(&self) -> bool {
+        match unsafe { self.window().sharingType() } {
+            NSWindowSharingType::None => true,
+            NSWindowSharingType::ReadOnly => false,
+            sharing_type => {
+                warn!(?sharing_type, "unknown sharing type");
+                false
+            },
+        }
+    }
+
     #[inline]
     pub fn set_content_protected(&self, protected: bool) {
         self.window().setSharingType(if protected {