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hV_GUI — Button

Button is a class with four functions: define, enable, draw and check.

It needs to be declared: 

    
Picture
Other specialised buttons include radio-buttons, check-box and flip-flop.

They are optimised with blac-and-white interface and support haptic feed-back.
Picture
The syntax of define allows multiple options:

Parameters of define are
  • LCD to which the button belongs, with &myLCD
  • top left x1 or point x0, 
  • top left y1 or point y0, 
  • bottom right x2 or x-width dx, 
  • bottom right y2 or y-height dy, 
  • label, 
  • text colour 16-bit coded, 
  • high colour 16-bit coded, 
  • low colour 16-bit coded, optional or half the high colour otherwise 
  • font size 9=automatic, 0..3=as per standard LCD sizes, optional or 9 otherwise

Note the short and the long syntaxes. The size of the button is defined as a vector with 
  • a point (x0, y0) 
  • and a size (dx, dy) for functions starting with a d.

    
The funciton enable() makes the button active, and draw() draws it on the screen.






    
In the main loop, the button is checked.

    
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