On Windows and macOS, add API to enable/disable window controls (#2537)

* On Windows and macOS, add API to enable/disable window controls

* fix build

* missing import

* use `WindowButtons` flags

* rename to `[set_]enabled_buttons`

* add example, fix windows impl for minimize

* macOS: Fix button enabling close/minimize while disabling maximized

* Update src/platform_impl/windows/window.rs

Co-authored-by: Kirill Chibisov <contact@kchibisov.com>

* compose the flags on a sep line, use `bool::then`

Co-authored-by: Mads Marquart <mads@marquart.dk>
Co-authored-by: Kirill Chibisov <contact@kchibisov.com>

src/platform_impl/linux/mod.rs

@@ -39,7 +39,10 @@ use crate::{
         ControlFlow, DeviceEventFilter, EventLoopClosed, EventLoopWindowTarget as RootELW,
     },
     icon::Icon,
-    window::{CursorGrabMode, CursorIcon, Theme, UserAttentionType, WindowAttributes, WindowLevel},
+    window::{
+        CursorGrabMode, CursorIcon, Theme, UserAttentionType, WindowAttributes, WindowButtons,
+        WindowLevel,
+    },
 };
 
 pub(crate) use crate::icon::RgbaIcon as PlatformIcon;
@@ -401,6 +404,16 @@ impl Window {
         x11_or_wayland!(match self; Window(w) => w.is_resizable())
     }
 
+    #[inline]
+    pub fn set_enabled_buttons(&self, buttons: WindowButtons) {
+        x11_or_wayland!(match self; Window(w) => w.set_enabled_buttons(buttons))
+    }
+
+    #[inline]
+    pub fn enabled_buttons(&self) -> WindowButtons {
+        x11_or_wayland!(match self; Window(w) => w.enabled_buttons())
+    }
+
     #[inline]
     pub fn set_cursor_icon(&self, cursor: CursorIcon) {
         x11_or_wayland!(match self; Window(w) => w.set_cursor_icon(cursor))

src/platform_impl/linux/wayland/window/mod.rs

@@ -18,7 +18,9 @@ use crate::platform_impl::{
     Fullscreen, MonitorHandle as PlatformMonitorHandle, OsError,
     PlatformSpecificWindowBuilderAttributes as PlatformAttributes,
 };
-use crate::window::{CursorGrabMode, CursorIcon, Theme, UserAttentionType, WindowAttributes};
+use crate::window::{
+    CursorGrabMode, CursorIcon, Theme, UserAttentionType, WindowAttributes, WindowButtons,
+};
 
 use super::env::WindowingFeatures;
 use super::event_loop::WinitState;
@@ -421,6 +423,14 @@ impl Window {
         self.resizeable.load(Ordering::Relaxed)
     }
 
+    #[inline]
+    pub fn set_enabled_buttons(&self, _buttons: WindowButtons) {}
+
+    #[inline]
+    pub fn enabled_buttons(&self) -> WindowButtons {
+        WindowButtons::all()
+    }
+
     #[inline]
     pub fn scale_factor(&self) -> u32 {
         // The scale factor from `get_surface_scale_factor` is always greater than zero, so

src/platform_impl/linux/x11/window.rs

@@ -21,7 +21,8 @@ use crate::{
         PlatformSpecificWindowBuilderAttributes, VideoMode as PlatformVideoMode,
     },
     window::{
-        CursorGrabMode, CursorIcon, Icon, Theme, UserAttentionType, WindowAttributes, WindowLevel,
+        CursorGrabMode, CursorIcon, Icon, Theme, UserAttentionType, WindowAttributes,
+        WindowButtons, WindowLevel,
     },
 };
 
@@ -1280,6 +1281,14 @@ impl UnownedWindow {
         self.shared_state_lock().is_resizable
     }
 
+    #[inline]
+    pub fn set_enabled_buttons(&self, _buttons: WindowButtons) {}
+
+    #[inline]
+    pub fn enabled_buttons(&self) -> WindowButtons {
+        WindowButtons::all()
+    }
+
     #[inline]
     pub fn xlib_display(&self) -> *mut c_void {
         self.xconn.display as _