Allow changing at runtime

crates/bevy_window/src/window.rs

@@ -294,6 +294,7 @@ pub struct Window {
     fit_canvas_to_parent: bool,
     command_queue: Vec<WindowCommand>,
     alpha_mode: CompositeAlphaMode,
+    always_on_top: bool,
 }
 /// A command to be sent to a window.
 ///
@@ -369,6 +370,9 @@ pub enum WindowCommand {
     SetResizeConstraints {
         resize_constraints: WindowResizeConstraints,
     },
+    SetAlwaysOnTop {
+        always_on_top: bool,
+    },
     Close,
 }
 
@@ -438,6 +442,7 @@ impl Window {
             fit_canvas_to_parent: window_descriptor.fit_canvas_to_parent,
             command_queue: Vec::new(),
             alpha_mode: window_descriptor.alpha_mode,
+            always_on_top: window_descriptor.always_on_top,
         }
     }
     /// Get the window's [`WindowId`].
@@ -496,6 +501,10 @@ impl Window {
         self.resize_constraints
     }
 
+    pub fn always_on_top(&self) -> bool {
+        self.always_on_top
+    }
+
     /// The window's client position in physical pixels.
     #[inline]
     pub fn position(&self) -> Option<IVec2> {
@@ -588,6 +597,12 @@ impl Window {
         });
     }
 
+    pub fn set_always_on_top(&mut self, always_on_top: bool) {
+        self.always_on_top = always_on_top;
+        self.command_queue
+            .push(WindowCommand::SetAlwaysOnTop { always_on_top });
+    }
+
     #[allow(missing_docs)]
     #[inline]
     pub fn update_scale_factor_from_backend(&mut self, scale_factor: f64) {

crates/bevy_winit/src/lib.rs

@@ -140,6 +140,10 @@ fn change_window(
                         .set_cursor_grab(convert_cursor_grab_mode(grab_mode))
                         .unwrap_or_else(|e| error!("Unable to un/grab cursor: {}", e));
                 }
+                bevy_window::WindowCommand::SetAlwaysOnTop { always_on_top } => {
+                    let window = winit_windows.get_window(id).unwrap();
+                    window.set_always_on_top(always_on_top)
+                }
                 bevy_window::WindowCommand::SetCursorVisibility { visible } => {
                     let window = winit_windows.get_window(id).unwrap();
                     window.set_cursor_visible(visible);