Lists





Lists

A list is a screen of choices. MIDP offers three list types: exclusive-choice, which allows the user to select one and only one element; multiple-choice, which allows the user to select zero or more elements; and implicit, which allows the user to select one element for a subsequent action. Figure shows the three list types.

1. Exclusive-Choice, Multiple-Choice, and Implicit Lists

graphics/05fig01.gif

Application Developer Responsibilities

MIDP Implementor Responsibilities

  • Abstract commands for the screen (not required for implicit lists)

  • Text associated with each element

  • Image, if any, for each element

  • Requested font, if any, for each element

  • Requested text handling (wrapped or not)

  • Preselected element or elements (a list-dependent number)

  • Default font and color

  • Text-display policy (wrapped, clipped, or scroll-through)

  • Element height

  • Default starting position of traversal highlight

  • How users traverse and scroll

  • How to indicate element selection

  • Legal image size for a list item

  • How users select an element

  • Giving the application a user's final selection


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