DEVELOPMENT TECHNOLOGY SOFTWARE by mark miguel

Author:mark miguel
Language: eng
Format: mobi, epub
Published: 2020-11-22T16:00:00+00:00

Chapter 10. DESIGN OF THE USER INTERFACE

10.1. Introduction

User interface (UI) is the part of an application that receives information from the user and displays it .

Due to the wide variety of users and types of software systems, there are many different styles of user interfaces , in the development of which different principles and approaches can be used . However, there are important principles , which must comply with ever [30]:

D UI must be based on the terms and concepts , know on ELSE ; D UI should be consistent ;

D UI should allow the user to fix their own mistakes ;

D the UI should allow the user to obtain help information : both of his request , as and generated R C.

At the present time widely distributed command and graphical user interfaces .

Team user interface gives the user the opportunity to apply to P C with some task ( request ), submitted some text ( command ) at a special command language ( language tasks ). The command user interface is usually only of choice for advanced users . This interface allows them to quickly interact with the computer and combine commands into procedures and programs .

The graphical user interface (GUI) provides the user with the following options :

1) refer to P C by selecting on the screen a suitable graphic or text object ;

2) to receive from n C information on the screen in the form of graphics and text objects ;

3) perform direct manipulation with graphic and text objects , represented on the screen ;

4) placed on the screen a plurality of different windows , in which can display information independently

;

5) use the on-screen pointer to select objects ( or their elements ) placed on the screen ; screen pointer is moved with the help of keyboard or mouse .

The advantage of the graphical user interface is an opportunity to create a convenient and comprehensible to the user model of interaction with P C ( panel sound control the detection , working table and so on . N .) Without the need to explore what - or special language . However, its development requires a lot of labor . Besides that , there is a serious problem for portability P C on other operating systems , so as the graphical interface greatly depends on capabilities ( graphical user platform ) provided by the operating system for its creation .

At the heart of the modern graphical user interface are two main concepts .

Prim second of these is the concept of the program , a managed data . As a rule , this concept is practically implemented through the mechanism of messages . External devices ( keyboard , mouse , timer ) send messages modules of the program on the occurrence of those or other events ( for example , when you press keys or moving the mouse ). Incoming messages get to all messages , where retrieved application program .

In this way , the program is not to

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