fn refresh_os_cursor()

in src/platform_impl/windows/window_state.rs [340:374]

• 26 lines of code
• 4 McCabe index (conditional complexity)

    fn refresh_os_cursor(self, window: HWND) -> Result<(), io::Error> {
        let client_rect = util::get_client_rect(window)?;

        if util::is_focused(window) {
            let cursor_clip = match self.contains(CursorFlags::GRABBED) {
                true => Some(client_rect),
                false => None,
            };

            let rect_to_tuple = |rect: RECT| (rect.left, rect.top, rect.right, rect.bottom);
            let active_cursor_clip = rect_to_tuple(util::get_cursor_clip()?);
            let desktop_rect = rect_to_tuple(util::get_desktop_rect());

            let active_cursor_clip = match desktop_rect == active_cursor_clip {
                true => None,
                false => Some(active_cursor_clip),
            };

            // We do this check because calling `set_cursor_clip` incessantly will flood the event
            // loop with `WM_MOUSEMOVE` events, and `refresh_os_cursor` is called by `set_cursor_flags`
            // which at times gets called once every iteration of the eventloop.
            if active_cursor_clip != cursor_clip.map(rect_to_tuple) {
                util::set_cursor_clip(cursor_clip)?;
            }
        }

        let cursor_in_client = self.contains(CursorFlags::IN_WINDOW);
        if cursor_in_client {
            util::set_cursor_hidden(self.contains(CursorFlags::HIDDEN));
        } else {
            util::set_cursor_hidden(false);
        }

        Ok(())
    }