fn set_simple_fullscreen()

in src/platform_impl/macos/window.rs [1052:1132]
61 lines of code
8 McCabe index (conditional complexity)

    fn set_simple_fullscreen(&self, fullscreen: bool) -> bool {
        let mut shared_state_lock = self.shared_state.lock().unwrap();

        unsafe {
            let app = NSApp();
            let is_native_fullscreen = shared_state_lock.fullscreen.is_some();
            let is_simple_fullscreen = shared_state_lock.is_simple_fullscreen;

            // Do nothing if native fullscreen is active.
            if is_native_fullscreen
                || (fullscreen && is_simple_fullscreen)
                || (!fullscreen && !is_simple_fullscreen)
            {
                return false;
            }

            if fullscreen {
                // Remember the original window's settings
                // Exclude title bar
                shared_state_lock.standard_frame = Some(NSWindow::contentRectForFrameRect_(
                    *self.ns_window,
                    NSWindow::frame(*self.ns_window),
                ));
                shared_state_lock.saved_style = Some(self.ns_window.styleMask());
                shared_state_lock.save_presentation_opts = Some(app.presentationOptions_());

                // Tell our window's state that we're in fullscreen
                shared_state_lock.is_simple_fullscreen = true;

                // Simulate pre-Lion fullscreen by hiding the dock and menu bar
                let presentation_options =
                    NSApplicationPresentationOptions::NSApplicationPresentationAutoHideDock |
                    NSApplicationPresentationOptions::NSApplicationPresentationAutoHideMenuBar;
                app.setPresentationOptions_(presentation_options);

                // Hide the titlebar
                util::toggle_style_mask(
                    *self.ns_window,
                    *self.ns_view,
                    NSWindowStyleMask::NSTitledWindowMask,
                    false,
                );

                // Set the window frame to the screen frame size
                let screen = self.ns_window.screen();
                let screen_frame = NSScreen::frame(screen);
                NSWindow::setFrame_display_(*self.ns_window, screen_frame, YES);

                // Fullscreen windows can't be resized, minimized, or moved
                util::toggle_style_mask(
                    *self.ns_window,
                    *self.ns_view,
                    NSWindowStyleMask::NSMiniaturizableWindowMask,
                    false,
                );
                util::toggle_style_mask(
                    *self.ns_window,
                    *self.ns_view,
                    NSWindowStyleMask::NSResizableWindowMask,
                    false,
                );
                NSWindow::setMovable_(*self.ns_window, NO);

                true
            } else {
                let new_mask = self.saved_style(&mut *shared_state_lock);
                self.set_style_mask_async(new_mask);
                shared_state_lock.is_simple_fullscreen = false;

                if let Some(presentation_opts) = shared_state_lock.save_presentation_opts {
                    app.setPresentationOptions_(presentation_opts);
                }

                let frame = shared_state_lock.saved_standard_frame();
                NSWindow::setFrame_display_(*self.ns_window, frame, YES);
                NSWindow::setMovable_(*self.ns_window, YES);

                true
            }
        }
    }