A TSplit.T is a parent window that giving its entire screen to one child at a time. The child being displayed is called the current child. The current child can be NIL, in which case the TSplit ignores all events.
INTERFACE TSplit; IMPORT VBT, Split; TYPE T <: Public; Private <: Split.T; Public = Private OBJECT METHODS <* LL.sup <= VBT.mu *> init(fickle := TRUE): T END;
The call v.init(fickle) initialize v as an empty TSplit.
If fickle is TRUE, then the shape of v will be the shape of its current child, or a VBT's default shape if the current child is NIL. If fickle is FALSE, then in each axis the size range of v will be the intersection of the size ranges of its children (if this intersection is empty, the children's maxsizes are increased until the intersection is non-empty). The preferred size of v is the the maximum of the preferred sizes of its children, projected into v's size range. If v has no children, its shape is a VBT's default shape.
PROCEDURE SetCurrent(v: T; ch: VBT.T) RAISES {Split.NotAChild}; <* LL.sup = VBT.mu *>
PROCEDURE GetCurrent(v: T): VBT.T; <* LL.sup = VBT.mu *>
Return the current child of v.
PROCEDURE Cons(ch0, ch1, ch2, ch3, ch4: VBT.T := NIL; fickle := TRUE): T; <* LL.sup = VBT.mu *>
Create a TSplit with children ch0, ch1, ....
Cons is equivalent to
v := NEW(T).init(fickle); Split.AddChild(v, ch0, ch1, ch2, ch3, ch4); IF ch0 # NIL THEN SetCurrent(v, ch0) END; RETURN v
END TSplit.
Set the current child of v to be ch and mark v for redisplay.