tailieunhanh - Multiple User InterfacesCross-Platform Applications and Context-Aware Interfaces phần 2

Hãy chắc chắn bạn có một thiết kế gắn kết để chuyển hướng của bạn là phù hợp. Dưới đây là một số câu hỏi bạn sẽ cần phải giải quyết để có được một đường dẫn rõ ràng đối với các giới hạn chức năng bạn sẽ cần phải làm rõ:. | 16 AHMED SEFFAH AND HOMA JAVAHERY trade-off that the user would be willing to make in return for the benefits of being able to use the system in mobile contexts. Conformity to default UI standards It is not necessary for all features to be made available on all devices. For example a PDA interface could eliminate images or it might show them in black and white. Similarly text can be abbreviated on a small display although it should be possible to retrieve the full text through a standardized command. These characteristics and constraints are not artefacts of current development technologies but are intrinsic to the MUI concept. Together they characterize a MUI and complicate its development. . VERTICAL VERSUS HORIZONTAL USABILITY MUI usability issues can be considered to have two dimensions vertical and horizontal. Vertical usability refers to usability requirements specific to each platform while horizontal usability is concerned with cross-platform usability requirements. Many system manufacturers have issued design guidelines to assist designers in developing usable applications. These guidelines can be categorized according to whether they advocate a design model . do this or whether they discourage a particular implementation . don t do this . For the PalmOS platform several design guidelines address navigation issues widget selection and use of specialized input mechanisms such as handwriting recognition. Microsoft Corporation has also published usability guidelines to assist developers with programming applications targeted at the Pocket PC platform. However give the user immediate and tangible feedback during interaction with an application is either too general or too simplistic. In many cases the use of several different guidelines could create inconsistencies. Guidelines can come into conflict more than usual and making a trade-off can become an unsolvable task for MUI developers. Sun s guidelines for the Java Swing .

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