Add a message

To add a new message call to the diagram,

SHIFT-LEFT-CLICK on either the target that should receive the message, its lifeline or one of its message activations

Select the receiver of the message
Open the target context menu
Select the 'Add call' menu item

Select an activation of the receiver of the message (usually more convenient)
Open the message context menu
Select the 'Add call' menu item

The new message will have the following properties :

it has an empty label
it's a message call
it's synchronous
it's instantaneous

The position of the new message call depends on how you've added it to the diagram :

When using the mouse

The position of the new message call in the call flow (and thus its location on the diagram) is based on where you've clicked

When using the keyboard

The position of the new message call in the call flow (and thus its location on the diagram) is based on the center of the selected activation.

The sender and receiver of the new message call are determined as follows :

Sender

control flow

found message

Receiver

You can always rearrange the messages afterwards by changing the message receiver and/or changing the message order (which might also change the message sender).

After the message has been added, Trace Modeler will automatically switch to text edit mode so you can immediately edit the message's call label.

Add a message

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