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Class: UserNotification


Inheritance:

   Object
   |
   +--GenericException
      |
      +--Notification
         |
         +--UserNotification
            |
            +--ActivityNotification
            |
            +--UserInformation
            |
            +--Warning

Package:
stx:libbasic
Category:
Kernel-Exceptions-Notifications
Version:
rev: 1.26 date: 2022/03/11 12:24:53
user: stefan
file: UserNotification.st directory: libbasic
module: stx stc-classLibrary: libbasic

Description:


UserNotification is the superclass of all user notification signals in the system. 
It produces an info box with the message on the screen. 
If no display is available, the message is logged (headless operation).

This allows for non-GUI model code to provide user notifications which are optionally shown.
Very useful, for example to provide progress information from a method which can be
invoked both from a GUI-Tool (where notifications are wanted) and also from the system,
where such notifications are not desired.

copyright

COPYRIGHT (c) 1999 by eXept Software AG All Rights Reserved This software is furnished under a license and may be used only in accordance with the terms of that license and with the inclusion of the above copyright notice. This software may not be provided or otherwise made available to, or used by, any other person. No title to or ownership of the software is hereby transferred.

Class protocol:

accessing
o  defaultNotifierString

helpers
o  hasDialog
answer true, if we can use a Dialog window

notification
o  notify: aString
(comment from inherited method)
raise the query - return the handler's value, or the default
value, if there is no handler.

o  notify: message progress: progress


Instance protocol:

default actions
o  defaultAction
Default action for notifications: open a info box with description

o  showInformationDialog
open a info box with description

testing
o  suppressDialogIfUnhandled
controls if a dialog is to be shown
in the default action when unhandled, or not.
Can be redefined by subclasses


Examples:


    UserNotification raiseRequest
    UserNotification raiseErrorString:'huh ?'
    UserNotification raiseRequestWith:nil errorString:'what ?'
    UserNotification raiseRequestWith:nil errorString:' what ?'


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