Programmer's Reference
All user interfaces have two directions of communication: from the
application to the user, and from the user back to the application.
Using Common Widgets, these two directions of communication work as
follows:
- The application creates and configures user interface components (widgets)
through the use of resources and functions, and
expresses interest in receiving notification of user actions by registering
callbacks and event handlers.
- The user interface notifies the application of user actions by calling
callbacks and event handlers.
The next sections explain how widgets are created and configured, and how
callbacks and event handlers allow the application to react to user
actions.
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