feat: add Window::is_resizable (#2171)

* feat: add `Window::is_resizable`

* move it right after `set_resizable`

src/platform_impl/android/mod.rs

@@ -543,6 +543,10 @@ impl Window {
 
     pub fn set_resizable(&self, _resizeable: bool) {}
 
+    pub fn is_resizable(&self) -> bool {
+        false
+    }
+
     pub fn set_minimized(&self, _minimized: bool) {}
 
     pub fn set_maximized(&self, _maximized: bool) {}

src/platform_impl/ios/window.rs

@@ -159,6 +159,11 @@ impl Inner {
         warn!("`Window::set_resizable` is ignored on iOS")
     }
 
+    pub fn is_resizable(&self) -> bool {
+        warn!("`Window::is_resizable` is ignored on iOS");
+        false
+    }
+
     pub fn scale_factor(&self) -> f64 {
         unsafe {
             let hidpi: CGFloat = msg_send![self.view, contentScaleFactor];

src/platform_impl/linux/mod.rs

@@ -366,6 +366,11 @@ impl Window {
         x11_or_wayland!(match self; Window(w) => w.set_resizable(resizable))
     }
 
+    #[inline]
+    pub fn is_resizable(&self) -> bool {
+        x11_or_wayland!(match self; Window(w) => w.is_resizable())
+    }
+
     #[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

@@ -336,6 +336,11 @@ impl Window {
         self.send_request(WindowRequest::Resizeable(resizable));
     }
 
+    #[inline]
+    pub fn is_resizable(&self) -> bool {
+        true
+    }
+
     #[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

@@ -1211,6 +1211,11 @@ impl UnownedWindow {
         .expect("Failed to call `XSetWMNormalHints`");
     }
 
+    #[inline]
+    pub fn is_resizable(&self) -> bool {
+        true
+    }
+
     #[inline]
     pub fn xlib_display(&self) -> *mut c_void {
         self.xconn.display as _

src/platform_impl/macos/window.rs

@@ -602,6 +602,12 @@ impl UnownedWindow {
         } // Otherwise, we don't change the mask until we exit fullscreen.
     }
 
+    #[inline]
+    pub fn is_resizable(&self) -> bool {
+        let is_resizable: BOOL = unsafe { msg_send![*self.ns_window, isResizable] };
+        is_resizable == YES
+    }
+
     pub fn set_cursor_icon(&self, cursor: CursorIcon) {
         let cursor = util::Cursor::from(cursor);
         if let Some(cursor_access) = self.cursor_state.upgrade() {

src/platform_impl/web/window.rs

@@ -151,6 +151,10 @@ impl Window {
         // Intentionally a no-op: users can't resize canvas elements
     }
 
+    pub fn is_resizable(&self) -> bool {
+        true
+    }
+
     #[inline]
     pub fn scale_factor(&self) -> f64 {
         super::backend::scale_factor()

src/platform_impl/windows/window.rs

@@ -225,6 +225,12 @@ impl Window {
         });
     }
 
+    #[inline]
+    pub fn is_resizable(&self) -> bool {
+        let window_state = self.window_state.lock();
+        window_state.window_flags.contains(WindowFlags::RESIZABLE)
+    }
+
     /// Returns the `hwnd` of this window.
     #[inline]
     pub fn hwnd(&self) -> HWND {