Concluded WG Remote UI (rui)
Note: The data for concluded WGs is occasionally incorrect.
|Area||Applications Area (app)|
Final Charter for Working Group
The Remote UI is a mechanism that enables user interfaces to be
rendered on other devices than those that run the application logic.
Manufacturers are creating devices that are highly optimised for
certain environments. Because the devices are intended for a diverse
range of purposes, their UI capabilities can vary considerably; screen
size and ratio, color depth, windowing system with various widget
sets, input methods are making the environment highly heterogenous. At
the same time, application developers and UI designers are trying to
create user interfaces that are high optimised for the rendering
platform, so that the user experience is improved by having the
respective application easy to learn and use.
A user interface may be composed of several widgets, wherein a widget
is understood as an element of a user interface that displays
information or provides a specific way for a user to interact with an
application. Widgets may for instance comprise icons, pull-down menus,
buttons, selection buttons, progress indicators, on-off checkmarks,
scrollbars, windows, window edges, toggle buttons, forms and any other
elements for displaying information, inviting, accepting, and
responding to user actions.
Therefore, when an UI is rendered on another device than the one that
is running the application logic, provisions need to be made, so that
the user can percieve the UI as a local application making it
A widget-level Remote UI protocol provides the mechanism which enable
a client device to generate a UI, received from a server device, using
the client device's native UI capabilities, and keeping the UI
synchronised with the application logic. Typically, a widget-level
Remote UI mechanism has usually three components:
- UI description language: contains the descriptions of the widgets,
their properties and relationships between the widgets. Typically the
widget-level UI descriptions are augmented with stylesheets containing
hints such as preferred colours to use, which layout to use, which
background picture, etc.
- The UI remoting protocol: is the transport protocol that is
responsible with communicating (partial) UI updates from the server to
the client and UI events triggered through changes in widget states
made by the user from the client to the server.
- Session setup: is responsible with identifying compatible servers
and clients and initiating the UI remoting session between them. A
client is compatible with a server when they support the same UI
remoting protocol and the same UI description language.