Statechart Diagram State Transition

• A state transition takes place, if

  • the event occurs
  • and the guard is true

• Default Assumptions

  • the lack of an event corresponds to the event “activity is finished” (completion transition)
  • the lack of a condition corresponds to [true]

• Actions on state transitions are possible

  • Special action: Sending a message to another objectsend receiver.message()
  • Example:right-mouse-down (loc) [ loc in window ] / obj:= pick-obj (loc); send obj.highlight()

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