| A Tie associates several Tieable objects. When the check() mehtod of the
Tie is called, it determines which of the Tieables has the largest serial number.
It then tells each Tieable to synchronize with that object. Ordinarily, the
Tie is added to a Controller, which is responsible for calling the Tie's
check() method.
This is meant to be used, for example, to Tie together two InputObjects to synchronize
the values that they represent. For example, you might want a VariableSlider
and a VariableInput to be alternative ways of inputting the same value. If so,
you can put them in a Tie and add that Tie to any Controller that is set to
respond to changes in the VariableSlider or VariableInput.
The x- and y- variables of a MouseTracker are also Tieable objects, so you
can synchronize the values of two MouseTrackers (in different CoordinateRects,
presumably) and you can synchronize the value of a MouseTracker variable with
a VariableInput or VariableSlider.
CoordinateRects and LimitControlPanels are also Tieable (to each other -- not
to Value objects). This is used to allow the LimitControlPanel to synchronize
with the Limits on the CoordinateRects that it controls. It could also
synchronize the Limits on two CoordinateRects, even in the absense of a
LimitControlPanel.
author:
David Eck |
