How to bind a LabelMorph/TextMorph to a variable so that the Morph reflects changes of the variable?

Question

• I have an object with a variable containing a String.
• I have a window containing a LabelMorph/TextMorph (or some other Morph that displays Text?).

How do i bind the LabelMorph/TextMorph to the variable, so that the label updates when the String in the variable changes?

• classic Smalltalk-80 dependent/change/update mechanism?
• Pharo Announcement framework?
• something different??

How would i do this? Which Morph should i use?

Answer 1

Simplest is to use an updating String morph:

UpdatingStringMorph on: self selector: #myLabel

This will send #myLabel (or any other message) to self (or any other object) and display it.