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Human Computer Interaction

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Introduction

Computer Interaction * Describe the key features of event driven programme: In computer programming, event driven program is a programming paradigm in which the flow of the programme is determined by a user actions (mouse clicks and key presses) or messages from other programs or objects. Event Driven Programs include Word processing, Database and other packages for drawing. This programs used with GUI operating systems. Key Features of Event Driven Program - Event Driven Programs have Event handlers, (user enter the code to run the event). - Event loops in event driven programs, keep checking if event happens. - Forms hold many objects that are used for events. - Trigger functions decides which codes can be used when an event happens. ...read more.

Middle

The event loops is a programming that waits for and dispatches event of messages in a program. It works by polling some internal and external Event providers that generally blocks until an event arrived and then calls the relevant event handlers. Event driven programming allows the user to create bespoke event loop to improve the functionality of programs. Forms Forms are main key feature of Event Driven programs, when a user runs an event, the user can see this forms. It contains all the objects or controls the programmer used to create the programs. Forms also have controls that have a collection of event which a programmer can use. The form event controls a program when the event or program loads and ends. ...read more.

Conclusion

Event driven program language environment such as Visual basis allows creating controls, when a user creates this control, the user defines or able the trigger functions. * Describe, with Examples, typical uses and advantages of event driven programs: Flexibility: It allows you have many controls to use codes, where to use them and how to place them. All objects have a control, for example, you can add text in a text box. Simple and quick to program: When you start to create objects, you can easily resized them and move, these all objects come with accessible properties. Suitable for Graphic User Interface: You can get lots of objects from this * Demonstrate the use of event driven tools and techniques: * Design and implement two different working event driven applications to meet defined requirements: * Test and document event driven applications ?? ?? ?? ?? Ambreen Kauser ID: 354842 Unit: 13 & 20 BTEC National Certificate ICT ...read more.

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