source/smoothcontrol.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgbase
   4 Copyright © 2007 Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include "smoothcontrol.h"
   9
  10 namespace Msp {
  11 namespace Input {
  12
  13 SmoothControl::SmoothControl():
  14         value(0),
  15         paired_ctrl(0)
  16 { }
  17
  18 SmoothControl::SmoothControl(const ControlSource &s):
  19         Control(s),
  20         value(0),
  21         paired_ctrl(0)
  22 { }
  23
  24 SmoothControl::SmoothControl(Device &d, ControlSrcType t, unsigned i):
  25         Control(d, t, i),
  26         value(0),
  27         paired_ctrl(0)
  28 { }
  29
  30 SmoothControl &SmoothControl::operator=(const SmoothControl &sc)
  31 {
  32         Control::operator=(sc);
  33
  34         return *this;
  35 }
  36
  37 SmoothControl::~SmoothControl()
  38 {
  39         pair(0);
  40 }
  41
  42 void SmoothControl::pair(SmoothControl *ctrl)
  43 {
  44         if(ctrl==paired_ctrl)
  45                 return;
  46
  47         if(paired_ctrl)
  48         {
  49                 SmoothControl *old_pair=paired_ctrl;
  50                 paired_ctrl=0;
  51                 old_pair->pair(0);
  52         }
  53
  54         paired_ctrl=ctrl;
  55
  56         if(paired_ctrl)
  57                 paired_ctrl->pair(this);
  58 }
  59
  60 void SmoothControl::on_press()
  61 {
  62         on_motion(1, 1-value);
  63 }
  64
  65 void SmoothControl::on_release()
  66 {
  67         if(value>0)
  68                 on_motion(0, -value);
  69 }
  70
  71 void SmoothControl::on_motion(float v, float)
  72 {
  73         value=v;
  74         signal_motion.emit(value);
  75
  76         if(paired_ctrl && paired_ctrl->get_value()!=-value)
  77                 paired_ctrl->on_motion(-value, -value-paired_ctrl->get_value());
  78 }
  79
  80 } // namespace Input
  81 } // namespace Msp