Overview of Common Widgets user interface concepts
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.
Last modified date: 01/29/2015