Name
Command
Synopsis
Command
is a class that represents an operation that the
may be represented in the user interface. Command
s may be
added to any Displayable
with the exception of
Alert
s and are rendered in a platform-dependent way, often
using buttons or as entries in a menu system. When the user activates the
user interface control associated with a Command
, the
CommandListener
associated with the Displayable
is notified.
A Command
has three attributes that are set at construction time.
Once set, the values of these attributes can be obtained using the
getLabel()
, getCommandType()
and
getPriority()
methods, but cannot be changed:
- Label
The command name that the user will see in the user interface.
- Type
A constant value that indicates the semantic intent of the command.
- Priority
An integer value that gives the priority of this command relative to others of the same type. Lower values indicate higher priority.
The type is used to indicate to the platform whether the command
is one of the standard types that it knows about and might provide special display handling for,
or an application-private command. The standard types, whose meanings should be obvious from
their names, are BACK
, CANCEL
, EXIT
,
HELP
, OK
and STOP
. Application-private
commands are assigned types of ITEM
or SCREEN
.
The type usually determines where the platform will display the command. Where there is more than one command with the same type, the priority value is used to determine the relative prominence of each ...
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