In sequence diagrams, an execution occurrence automatically
resizes vertically to indicate the time during which a participant
is active. The top of the execution occurrence aligns at the point
where the message is received and initiates the behavior; the bottom
aligns with the finish of the behavior during an interaction. If
you resize the execution occurrence across any messages and fragments,
the execution occurrence reorders in the interaction.
Restriction: You cannot resize
an execution occurrence that has a return message attached to it.
To
resize and reorder an execution occurrence:
- Open a sequence diagram that contains at least
one lifeline with an execution occurrence.
- In the interaction frame, complete one of the following
steps:
- To resize an execution occurrence, drag the handles
up or down without crossing any messages and fragments.
- To resize a nested execution occurrence, drag the handles
up or down to the maximum vertical limit of the execution occurrence
that it is nested on.
- To reorder an execution occurrence across existing messages
and fragments, drag the handles up or down.
Note: During a reorder, if you resize the execution
occurrence up, the start point of the execution occurrence appears
before the message and fragments that you crossed. If you resize
the execution occurrence down, the finish point of the execution
occurrence appears after the message and fragments that you crossed.