[求助]：请教高手setUserInputControls

sccat

帮助里面是这样写的：

Use the following function to change the default user input controls:

void setUserInputControls(AcEdJig::UserInputControls uic);
The user input controls put limitations on the drag sequence or the type of acceptable return value (for example, by not allowing negative responses, by not allowing a zero response, or by restricting the input value to a 2D coordinate). They also specify how various user actions affect the drag sequence. For example, kAcceptMouseUpAsPoint specifies that releasing the mouse button indicates the input value



主要想问：For example, kAcceptMouseUpAsPoint specifies that releasing the mouse button indicates the input value

这个是通过什么实现的？通过系统变量吗？其他如Lisp或VBA能否实现？