Event property sheet Parameters tab

Chapter 5 Building Dynamic Diagrams

Event property sheet Parameters tab

The Parameters tab lists all the parameters associated with the event. It allows you to define event parameters that correspond to the event signature.

You can add a parameter in the list by clicking the Add a Row tool, and then open its property sheet by clicking on the Properties tool. A parameter has the following properties:

Property	Description
Parent	Event to which the parameter belongs
Name	Name of the parameter
Code	Reference name of the parameter
Comment	Descriptive comment for the parameter
Data type	Set of instances sharing the same semantics
Array	When selected, indicates that the data type is a table format
Parameter Type	Direction of information flow for the parameter. Indicates what is returned when the parameter is called by the event during the execution process. You can choose from the following: In – Input parameter passed by value. The final value can not be modified and information is not available to the caller In/Out – Input parameter that may be modified. The final value may be modified to communicate information to the caller Out – Output parameter. The final value may be modified to communicate information to the caller
Default value	Default value when a parameter is omitted. For example: Use an operation `oper(string param1, integer param2)` , and specify two arguments oper(val1, val2) during invocation. Some languages, like C++, allow you to define a default value that is then memorized when the parameter is omitted during invocation. If the declaration of the method is oper(string param1, integer param2 = default), then the invocation oper(val1) is similar to oper(val1, default).