Partially implement cursor state on win32

src/win32/init.rs

@@ -15,11 +15,13 @@ use Api;
 use BuilderAttribs;
 use CreationError;
 use CreationError::OsError;
+use CursorState;
 use GlRequest;
 use PixelFormat;
 
 use std::ffi::CString;
 use std::sync::mpsc::channel;
+use std::sync::Mutex;
 
 use libc;
 use super::gl;
@@ -250,6 +252,7 @@ unsafe fn init(title: Vec<u16>, builder: BuilderAttribs<'static>,
         gl_library: gl_library,
         events_receiver: events_receiver,
         is_closed: AtomicBool::new(false),
+        cursor_state: Mutex::new(CursorState::Normal),
     })
 }
 
@@ -265,7 +268,7 @@ unsafe fn register_window_class() -> Vec<u16> {
         cbWndExtra: 0,
         hInstance: kernel32::GetModuleHandleW(ptr::null()),
         hIcon: ptr::null_mut(),
-        hCursor: ptr::null_mut(),
+        hCursor: ptr::null_mut(),       // must be null in order for cursor state to work properly
         hbrBackground: ptr::null_mut(),
         lpszMenuName: ptr::null(),
         lpszClassName: class_name.as_ptr(),