The window whose callback to set.
The new callback, or null to remove the currently set callback.
The previously set callback, or null if no callback was set or the library had not been initialized.
@callback_signature
void function_name(GLFWwindow* window, int xpos, int ypos)
For more information about the callback parameters, see the function pointer type.
Errors: Possible errors include @ref GLFW_NOT_INITIALIZED.
@remark @wayland This callback will never be called, as there is no way for an application to know its global position.
This function must only be called from the main thread.
@sa @ref window_pos
Added in version 3.0.
Ingroup: window
Sets the position callback for the specified window.
This function sets the position callback of the specified window, which is called when the window is moved. The callback is provided with the position, in screen coordinates, of the upper-left corner of the content area of the window.