prolooks/Led.vala

   1 /*
   2     Copyright 2009 by Krzysztof Foltman
   3     License: LGPLv2+
   4 */
   5
   6 using Gtk;
   7
   8 namespace Prolooks {
   9
  10 public class Led : DrawingArea {
  11
  12     private bool _led_state = false;
  13
  14     private double r = 1;
  15     private double g = 0;
  16     private double b = 0;
  17
  18     public bool led_state {
  19         set {
  20             _led_state = value;
  21             queue_draw();
  22         }
  23         get {
  24             return _led_state;
  25         }
  26     }
  27
  28     public Led () {
  29
  30         // Set favored widget size
  31         set_size_request (12, 12);
  32     }
  33
  34     public string color {
  35         set {
  36             if (value != null & value != "") {
  37                 gdk_color_to_cairo_color (color_from_string (value), ref r, ref g, ref b);
  38                 queue_draw ();
  39             } else {
  40                 r = 1; g = 0; b = 0;
  41             }
  42         }
  43     }
  44
  45     public void set_rgb(double _r, double _g, double _b)
  46     {
  47         r = _r;
  48         g = _g;
  49         b = _b;
  50         queue_draw();
  51     }
  52
  53     public void get_rgb(ref double _r, ref double _g, ref double _b)
  54     {
  55         _r = r;
  56         _g = g;
  57         _b = b;
  58     }
  59
  60     /* Widget is asked to draw itself */
  61     public override bool expose_event (Gdk.EventExpose event) {
  62
  63         // Create a Cairo context
  64         var cr = Gdk.cairo_create (this.window);
  65
  66         // Set clipping area in order to avoid unnecessary drawing
  67         cr.rectangle (event.area.x, event.area.y,
  68                       event.area.width, event.area.height);
  69         cr.clip ();
  70
  71         set_source_color(cr, style.bg[Gtk.StateType.NORMAL]);
  72         cr.rectangle(0, 0, allocation.width, allocation.height);
  73         cr.fill();
  74
  75         int xc = allocation.width / 2;
  76         int yc = allocation.height / 2;
  77
  78         int diameter = (allocation.width < allocation.height ? allocation.width : allocation.height) - 1;
  79
  80         Cairo.Pattern pt = new Cairo.Pattern.radial(xc, yc + diameter / 4, 0, xc, yc, diameter / 2);
  81         double m1 = _led_state ? 1.0 : 0.25;
  82         double m2 = _led_state ? 0.75 : 0.2;
  83         double m3 = _led_state ? 0.25 : 0.1;
  84         double m4 = 0.3;
  85         pt.add_color_stop_rgb(0.0, r * m1, g * m1, b * m1);
  86         pt.add_color_stop_rgb(0.5, r * m2, g * m2, b * m2);
  87         pt.add_color_stop_rgb(1.0, r * m3, g * m3, b * m3);
  88
  89         cr.arc(xc, yc, diameter / 2, 0, 2 * Math.PI);
  90         cr.set_line_join(Cairo.LineJoin.BEVEL);
  91         cr.set_source (pt);
  92         cr.fill();
  93
  94         cr.arc(xc, yc, diameter / 2, 0, 2 * Math.PI);
  95         cr.set_line_width(0.5);
  96         cr.set_source_rgba (r * m4, g * m4 , b * m4, 0.5);
  97         cr.stroke();
  98
  99         return false;
 100     }
 101 }
 102
 103 } // namespace Prolooks