Corrections to sharing data

src/api/win32/callback.rs

@@ -10,6 +10,7 @@ use WindowAttributes;
 use CursorState;
 use Event;
 use super::event;
+use super::WindowState;
 
 use user32;
 use shell32;
@@ -20,13 +21,6 @@ use winapi;
 /// a thread-local variable.
 thread_local!(pub static CONTEXT_STASH: RefCell<Option<ThreadLocalData>> = RefCell::new(None));
 
-/// Contains information about states and the window for the callback.
-#[derive(Clone)]
-pub struct WindowState {
-    pub cursor_state: CursorState,
-    pub attributes: WindowAttributes
-}
-
 pub struct ThreadLocalData {
     pub win: winapi::HWND,
     pub sender: Sender<Event>,
@@ -257,7 +251,7 @@ pub unsafe extern "system" fn callback(window: winapi::HWND, msg: winapi::UINT,
                 let cstash = cstash.as_ref();
                 // there's a very bizarre borrow checker bug
                 // possibly related to rust-lang/rust/#23338
-                let _window_state = if let Some(cstash) = cstash {
+                let _cursor_state = if let Some(cstash) = cstash {
                     if let Ok(window_state) = cstash.window_state.lock() {
                         match window_state.cursor_state {
                             CursorState::Normal => {

src/api/win32/init.rs

@@ -5,7 +5,7 @@ use std::mem;
 use std::thread;
 
 use super::callback;
-use super::callback::WindowState;
+use super::WindowState;
 use super::Window;
 use super::MonitorId;
 use super::WindowWrapper;
@@ -215,8 +215,11 @@ unsafe fn init(title: Vec<u16>, window: &WindowAttributes, pf_reqs: &PixelFormat
         user32::SetForegroundWindow(real_window.0);
     }
 
-    // Creating a mutex to track the current cursor state
-    let cursor_state = CursorState::Normal;
+    // Creating a mutex to track the current window state
+    let window_state = Arc::new(Mutex::new(WindowState {
+        cursor_state: CursorState::Normal,
+        attributes: window.clone()
+    }));
 
     // filling the CONTEXT_STASH task-local storage so that we can start receiving events
     let events_receiver = {
@@ -226,10 +229,7 @@ unsafe fn init(title: Vec<u16>, window: &WindowAttributes, pf_reqs: &PixelFormat
             let data = callback::ThreadLocalData {
                 win: real_window.0,
                 sender: tx.take().unwrap(),
-                window_state: Arc::new(Mutex::new(WindowState {
-                    cursor_state: cursor_state.clone(),
-                    attributes: window.clone()
-                }))
+                window_state: window_state.clone()
             };
             (*context_stash.borrow_mut()) = Some(data);
         });
@@ -241,7 +241,7 @@ unsafe fn init(title: Vec<u16>, window: &WindowAttributes, pf_reqs: &PixelFormat
         window: real_window,
         context: context,
         events_receiver: events_receiver,
-        cursor_state: cursor_state,
+        window_state: window_state,
     })
 }
 

src/api/win32/mod.rs

@@ -42,6 +42,13 @@ lazy_static! {
     static ref WAKEUP_MSG_ID: u32 = unsafe { user32::RegisterWindowMessageA("Glutin::EventID".as_ptr() as *const i8) };
 }
 
+/// Contains information about states and the window for the callback.
+#[derive(Clone)]
+pub struct WindowState {
+    pub cursor_state: CursorState,
+    pub attributes: WindowAttributes
+}
+
 /// The Win32 implementation of the main `Window` object.
 pub struct Window {
     /// Main handle for the window.
@@ -53,8 +60,8 @@ pub struct Window {
     /// Receiver for the events dispatched by the window callback.
     events_receiver: Receiver<Event>,
 
-    /// The current cursor state.
-    cursor_state: CursorState,
+    /// The current window state.
+    window_state: Arc<Mutex<WindowState>>,
 }
 
 unsafe impl Send for Window {}
@@ -258,7 +265,7 @@ impl Window {
     }
 
     pub fn set_cursor_state(&self, state: CursorState) -> Result<(), String> {
-        let mut current_state = self.cursor_state;
+        let mut current_state = self.window_state.lock().unwrap().cursor_state;
 
         let foreground_thread_id = unsafe { user32::GetWindowThreadProcessId(self.window.0, ptr::null_mut()) };
         let current_thread_id = unsafe { kernel32::GetCurrentThreadId() };