glfw.py 文件源码

def set_cursor_pos_callback(window, cbfun):
    '''
    Sets the cursor position callback.

    Wrapper for:
        GLFWcursorposfun glfwSetCursorPosCallback(GLFWwindow* window, GLFWcursorposfun cbfun);
    '''
    window_addr = ctypes.cast(ctypes.pointer(window),
                              ctypes.POINTER(ctypes.c_long)).contents.value
    if window_addr in _cursor_pos_callback_repository:
        previous_callback = _cursor_pos_callback_repository[window_addr]
    else:
        previous_callback = None
    if cbfun is None:
        cbfun = 0
    c_cbfun = _GLFWcursorposfun(cbfun)
    _cursor_pos_callback_repository[window_addr] = (cbfun, c_cbfun)
    cbfun = c_cbfun
    _glfw.glfwSetCursorPosCallback(window, cbfun)
    if previous_callback is not None and previous_callback[0] != 0:
        return previous_callback[0]