TouchableViews - A simple GUI system

On this website follows a presentation of a "do-it-yourself" GUI concept in three levels. The first level is introductory and describes the main concept but does not include any dedicated components. The second level includes components such as buttons and text fields. This level is already sufficient for many applications. The third level describes how to define new components and presents some additional components. 

Illustration
Figure: Example application using TouchableVIews


Why a simple GUI system?


With the event of inexpensive touch screens, also non-general computers such as embedded systems are increasingly incorporating graphical user interfaces (GUIs).  With such an interface the user can click on buttons, input values by turning or sliding knobs and view text or graphics in dedicated areas on the screen. This is much in contrast to the text commands from the childhood of the computer age.

Even though it is fairly easy to use a GUI library once you are on a broadly spread platform such as the PC, Mac, iPhone or Android machine you have to use the operating systems and programming languages for which those libraries have been developed. For embedded systems such as those found in coffee machines, toys, student projects et cetera the idea of filling the system with megabytes of library code just to support your own application that might be as small as a few hundred lines of code may feel a bit unbalanced. Not because memory is particularly expensive but because you have to spend a lot of your development time understanding how to use and port those libraries. If, for some reason, the GUI part takes too much of your computing power or you would like to make your own specific control, you are left digging into huge amount of source code made by other people or be dependent on the provider of the GUI system to help you with your task.

TouchableViews is based on a few very simple principles. Once you have grasped them you can either implement them in your own favorite programming language, may it be assembly code, C, C++, Pascal or any other language. Yes, that is right, you can actually make the GUI code as part of your own application without incorporating any libraries at all just by following the simple principles described here!

Alternatively, if you are using C as your programming language you can simply include the code that you find on this web site.  


Figure: An application which shows the available components


This site is © Copyright Robert Forchheimer 2011-2012, All Rights Reserved.
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