Add Window::set_content_protected on macOS and Windows (#2525)

* Add `Window::set_content_protect` on macOS and Windows

* Update window.rs

* Add builder variant

* fix import

* fix argument type

* fix import

* fix always visible window on Windows

* update docs

src/platform_impl/macos/appkit/mod.rs

@@ -54,7 +54,7 @@ pub(crate) use self::version::NSAppKitVersion;
 pub(crate) use self::view::{NSTrackingRectTag, NSView};
 pub(crate) use self::window::{
     NSBackingStoreType, NSWindow, NSWindowButton, NSWindowLevel, NSWindowOcclusionState,
-    NSWindowStyleMask, NSWindowTitleVisibility,
+    NSWindowSharingType, NSWindowStyleMask, NSWindowTitleVisibility,
 };
 
 #[link(name = "AppKit", kind = "framework")]

src/platform_impl/macos/appkit/window.rs

@@ -84,6 +84,9 @@ extern_methods!(
         #[sel(setMovable:)]
         pub fn setMovable(&self, movable: bool);
 
+        #[sel(setSharingType:)]
+        pub fn setSharingType(&self, sharingType: NSWindowSharingType);
+
         #[sel(setOpaque:)]
         pub fn setOpaque(&self, opaque: bool);
 
@@ -349,3 +352,16 @@ pub enum NSBackingStoreType {
 unsafe impl Encode for NSBackingStoreType {
     const ENCODING: Encoding = NSUInteger::ENCODING;
 }
+
+#[allow(dead_code)]
+#[repr(usize)] // NSUInteger
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+pub enum NSWindowSharingType {
+    NSWindowSharingNone = 0,
+    NSWindowSharingReadOnly = 1,
+    NSWindowSharingReadWrite = 2,
+}
+
+unsafe impl Encode for NSWindowSharingType {
+    const ENCODING: Encoding = NSUInteger::ENCODING;
+}

src/platform_impl/macos/window.rs

@@ -45,7 +45,8 @@ use objc2::{declare_class, msg_send, msg_send_id, sel, ClassType};
 use super::appkit::{
     NSApp, NSAppKitVersion, NSAppearance, NSApplicationPresentationOptions, NSBackingStoreType,
     NSColor, NSCursor, NSFilenamesPboardType, NSRequestUserAttentionType, NSResponder, NSScreen,
-    NSWindow, NSWindowButton, NSWindowLevel, NSWindowStyleMask, NSWindowTitleVisibility,
+    NSWindow, NSWindowButton, NSWindowLevel, NSWindowSharingType, NSWindowStyleMask,
+    NSWindowTitleVisibility,
 };
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
@@ -305,6 +306,10 @@ impl WinitWindow {
                 this.setTitle(&NSString::from_str(&attrs.title));
                 this.setAcceptsMouseMovedEvents(true);
 
+                if attrs.content_protected {
+                    this.setSharingType(NSWindowSharingType::NSWindowSharingNone);
+                }
+
                 if pl_attrs.titlebar_transparent {
                     this.setTitlebarAppearsTransparent(true);
                 }
@@ -1123,6 +1128,14 @@ impl WinitWindow {
     }
 
     #[inline]
+    pub fn set_content_protected(&self, protected: bool) {
+        self.setSharingType(if protected {
+            NSWindowSharingType::NSWindowSharingNone
+        } else {
+            NSWindowSharingType::NSWindowSharingReadOnly
+        })
+    }
+
     pub fn title(&self) -> String {
         self.title_().to_string()
     }