De?¬?ning menus
with the language was made possible via a speci?¬?c ?¬‚ow, in which the ?¬‚ow end (a
role called Menu item) allowed specifying a menu label and a target element. This
target was usually a UI element or a phone service. The use of multiple
relationships for each menu item did not allow specifying the order of the menu
items. Ordering was not considered important as the Python framework itself did
not provide full control of menu item ordering but only allowed adding newitems.
Item ordering could have been supported by adding order numbers for the ?¬‚ows or
by using separate menu item elements, in other words, using a structure similar to
the one for List.
Other internal behavior was dependent on each UI control and thus was captured as
part of the respective type. The main controls include the following:
168 MOBILE PHONE APPLICATIONS USING A PYTHON FRAMEWORK
. Form: A dynamically con?¬?gurable, editable multi?¬?eld dialog. Form is
characterized by ?¬?elds, which can be either a simple input entry ?¬?eld or a
Combo ?¬?eld. In the language de?¬?nition, Field was de?¬?ned as a collection of
Form ?¬?elds and Combo ?¬?elds. A Form ?¬?eld element is de?¬?ned by a label, a data
type, and an initial value, and a Combo ?¬?eld is de?¬?ned by a label and a
collection of values. Because Form can be used either for editing the ?¬?eld
values or just for viewing them, a property to choose between Edit and View
modes was added to the Form element.
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