macOS: Resizable without decorations (#553)

* macOS: Resizable without decorations

* Fix style mask regressions

CHANGELOG.md

@@ -2,13 +2,14 @@
 
 - On X11, the `Moved` event is no longer sent when the window is resized without changing position.
 - `MouseCursor` and `CursorState` now implement `Default`.
-- `WindowBuilder::with_resizable` implemented for Windows & X11.
+- `WindowBuilder::with_resizable` implemented for Windows, X11, and macOS.
 - On X11, if the monitor's width or height in millimeters is reported as 0, the DPI is now 1.0 instead of +inf.
 - On X11, the environment variable `WINIT_HIDPI_FACTOR` has been added for overriding DPI factor.
 - On X11, enabling transparency no longer causes the window contents to flicker when resizing.
 - On X11, `with_override_redirect` now actually enables override redirect.
 - macOS now generates `VirtualKeyCode::LAlt` and `VirtualKeyCode::RAlt` instead of `None` for both.
 - On macOS, `VirtualKeyCode::RWin` and `VirtualKeyCode::LWin` are no longer switched.
+- On macOS, windows without decorations can once again be resized.
 
 # Version 0.15.0 (2018-05-22)
 

src/platform/macos/window.rs

@@ -58,14 +58,16 @@ impl DelegateState {
             // resizable temporality
             let curr_mask = self.window.styleMask();
 
-            if !curr_mask.contains(NSWindowStyleMask::NSTitledWindowMask) {
-                util::set_style_mask(*self.window, *self.view, NSWindowStyleMask::NSResizableWindowMask);
+            let required = NSWindowStyleMask::NSTitledWindowMask | NSWindowStyleMask::NSResizableWindowMask;
+            let needs_temp_mask = !curr_mask.contains(required);
+            if needs_temp_mask {
+                util::set_style_mask(*self.window, *self.view, required);
             }
 
             let is_zoomed: BOOL = msg_send![*self.window, isZoomed];
 
             // Roll back temp styles
-            if !curr_mask.contains(NSWindowStyleMask::NSTitledWindowMask) {
+            if needs_temp_mask {
                 util::set_style_mask(*self.window, *self.view, curr_mask);
             }
 
@@ -76,13 +78,20 @@ impl DelegateState {
     fn restore_state_from_fullscreen(&mut self) {
         let maximized = unsafe {
             let mut win_attribs = self.win_attribs.borrow_mut();
-
             win_attribs.fullscreen = None;
-            let save_style_opt = self.save_style_mask.take();
 
-            if let Some(save_style) = save_style_opt {
-                util::set_style_mask(*self.window, *self.view, save_style);
+            let mask = {
+                let base_mask = self.save_style_mask
+                    .take()
+                    .unwrap_or_else(|| self.window.styleMask());
+                if win_attribs.resizable {
+                    base_mask | NSWindowStyleMask::NSResizableWindowMask
+                } else {
+                    base_mask & !NSWindowStyleMask::NSResizableWindowMask
                 }
+            };
+
+            util::set_style_mask(*self.window, *self.view, mask);
 
             win_attribs.maximized
         };
@@ -107,16 +116,17 @@ impl DelegateState {
         let mut win_attribs = self.win_attribs.borrow_mut();
         win_attribs.maximized = maximized;
 
+        let curr_mask = unsafe { self.window.styleMask() };
         if win_attribs.fullscreen.is_some() {
             // Handle it in window_did_exit_fullscreen
             return;
-        } else if win_attribs.decorations {
-            // Just use the native zoom if not borderless
+        } else if curr_mask.contains(NSWindowStyleMask::NSResizableWindowMask) {
+            // Just use the native zoom if resizable
             unsafe {
                 self.window.zoom_(nil);
             }
         } else {
-            // if it is borderless, we set the frame directly
+            // if it's not resizable, we set the frame directly
             unsafe {
                 let new_rect = if maximized {
                     let screen = NSScreen::mainScreen(nil);
@@ -558,7 +568,7 @@ impl WindowExt for Window2 {
 impl Window2 {
     pub fn new(
         shared: Weak<Shared>,
-        win_attribs: WindowAttributes,
+        mut win_attribs: WindowAttributes,
         pl_attribs: PlatformSpecificWindowBuilderAttributes,
     ) -> Result<Window2, CreationError> {
         unsafe {
@@ -566,6 +576,10 @@ impl Window2 {
                 panic!("Windows can only be created on the main thread on macOS");
             }
         }
+
+        // Might as well save some RAM...
+        win_attribs.window_icon.take();
+
         let autoreleasepool = unsafe {
             NSAutoreleasePool::new(nil)
         };
@@ -721,9 +735,10 @@ impl Window2 {
             };
 
             let mut masks = if !attrs.decorations && !screen.is_some() {
-                // unresizable Window2 without a titlebar or borders
+                // Resizable Window2 without a titlebar or borders
                 // if decorations is set to false, ignore pl_attrs
                 NSWindowStyleMask::NSBorderlessWindowMask
+                    | NSWindowStyleMask::NSResizableWindowMask
             } else if pl_attrs.titlebar_hidden {
                 // if the titlebar is hidden, ignore other pl_attrs
                 NSWindowStyleMask::NSBorderlessWindowMask |
@@ -736,8 +751,12 @@ impl Window2 {
                     NSWindowStyleMask::NSTitledWindowMask
             };
 
+            if !attrs.resizable {
+                masks &= !NSWindowStyleMask::NSResizableWindowMask;
+            }
+
             if pl_attrs.fullsize_content_view {
-                masks = masks | NSWindowStyleMask::NSFullSizeContentViewWindowMask;
+                masks |= NSWindowStyleMask::NSFullSizeContentViewWindowMask;
             }
 
             let winit_window = Window2::class();
@@ -900,6 +919,21 @@ impl Window2 {
         }
     }
 
+    #[inline]
+    pub fn set_resizable(&self, resizable: bool) {
+        let mut win_attribs = self.delegate.state.win_attribs.borrow_mut();
+        win_attribs.resizable = resizable;
+        if win_attribs.fullscreen.is_none() {
+            let mut mask = unsafe { self.window.styleMask() };
+            if resizable {
+                mask |= NSWindowStyleMask::NSResizableWindowMask;
+            } else {
+                mask &= !NSWindowStyleMask::NSResizableWindowMask;
+            }
+            unsafe { util::set_style_mask(*self.window, *self.view, mask) };
+        } // Otherwise, we don't change the mask until we exit fullscreen.
+    }
+
     #[inline]
     pub fn platform_display(&self) -> *mut libc::c_void {
         unimplemented!()
@@ -1028,11 +1062,9 @@ impl Window2 {
             // It will clean up at window_did_exit_fullscreen.
             if current.is_none() {
                 let curr_mask = state.window.styleMask();
-
-                if !curr_mask.contains(NSWindowStyleMask::NSTitledWindowMask) {
-                    let mask = NSWindowStyleMask::NSTitledWindowMask
-                        | NSWindowStyleMask::NSResizableWindowMask;
-                    util::set_style_mask(*self.window, *self.view, mask);
+                let required = NSWindowStyleMask::NSTitledWindowMask | NSWindowStyleMask::NSResizableWindowMask;
+                if !curr_mask.contains(required) {
+                    util::set_style_mask(*self.window, *self.view, required);
                     state.save_style_mask.set(Some(curr_mask));
                 }
             }
@@ -1059,14 +1091,18 @@ impl Window2 {
         }
 
         unsafe {
-            let new_mask = if decorations {
+            let mut new_mask = if decorations {
                 NSWindowStyleMask::NSClosableWindowMask
                     | NSWindowStyleMask::NSMiniaturizableWindowMask
                     | NSWindowStyleMask::NSResizableWindowMask
                     | NSWindowStyleMask::NSTitledWindowMask
             } else {
                 NSWindowStyleMask::NSBorderlessWindowMask
+                    | NSWindowStyleMask::NSResizableWindowMask
             };
+            if !win_attribs.resizable {
+                new_mask &= !NSWindowStyleMask::NSResizableWindowMask;
+            }
             util::set_style_mask(*state.window, *state.view, new_mask);
         }
     }

src/window.rs

@@ -53,7 +53,7 @@ impl WindowBuilder {
     ///
     /// ## Platform-specific
     ///
-    /// This only has an effect on Windows & X11.
+    /// This only has an effect on Windows, X11, and macOS.
     #[inline]
     pub fn with_resizable(mut self, resizable: bool) -> WindowBuilder {
         self.window.resizable = resizable;