Windows: implement with_resizable (#540) (#541)

* Windows: implement with_resizable (#540)

* Fixed typo

src/lib.rs

@@ -422,6 +422,11 @@ pub struct WindowAttributes {
     /// The default is `None`.
     pub max_dimensions: Option<(u32, u32)>,
 
+    /// [Windows only] Whether the window is resizable or not
+    ///
+    /// The default is `true`.
+    pub resizable: bool,
+
     /// Whether the window should be set as fullscreen upon creation.
     ///
     /// The default is `None`.
@@ -475,6 +480,7 @@ impl Default for WindowAttributes {
             dimensions: None,
             min_dimensions: None,
             max_dimensions: None,
+            resizable: true,
             title: "winit window".to_owned(),
             maximized: false,
             fullscreen: None,

src/platform/windows/window.rs

@@ -843,6 +843,10 @@ unsafe fn init(
             style | winuser::WS_VISIBLE
         };
 
+        if !window.resizable {
+            style &= !winuser::WS_SIZEBOX;
+        }
+
         if pl_attribs.parent.is_some() {
             style |= winuser::WS_CHILD;
         }

src/window.rs

@@ -49,6 +49,17 @@ impl WindowBuilder {
         self
     }
 
+    /// Sets whether the window is resizable or not
+    ///
+    /// ## Platform-specific
+    ///
+    /// This only has an effect on Windows.
+    #[inline]
+    pub fn with_resizable(mut self, resizable: bool) -> WindowBuilder {
+        self.window.resizable = resizable;
+        self
+    }
+
     /// Requests a specific title for the window.
     #[inline]
     pub fn with_title<T: Into<String>>(mut self, title: T) -> WindowBuilder {