code.delx.au - virtualtones/blob - instrument.cpp

   1 // instrument.cpp - An instrument widget
   2 // Written by James Bunton <james@delx.net.au>
   3 // Licensed under the GPL, see COPYING.txt for more details
   4
   5
   6 #include "instrument.h"
   7
   8 using namespace Qt;
   9
  10
  11 Instrument::Instrument(QWidget *parent)
  12 : QWidget(parent, 0)
  13 {
  14         // Grab focus
  15 //      grabKeyboard();
  16         setFocusPolicy(StrongFocus);
  17         setFocus();
  18
  19         noteStart = 0;
  20
  21         // Initialise the base midi notes array
  22         midnotes[0]  = QString("C");
  23         midnotes[1]  = QString("C#");
  24         midnotes[2]  = QString("D");
  25         midnotes[3]  = QString("D#");
  26         midnotes[4]  = QString("E");
  27         midnotes[5]  = QString("F");
  28         midnotes[6]  = QString("F#");
  29         midnotes[7]  = QString("G");
  30         midnotes[8]  = QString("G#");
  31         midnotes[9]  = QString("A");
  32         midnotes[10] = QString("A#");
  33         midnotes[11] = QString("B");
  34 }
  35
  36 Instrument::~Instrument()
  37 {
  38         releaseKeyboard();
  39 }
  40
  41 void Instrument::displayHelp()
  42 {
  43         QMessageBox::information(this, "Help", generateHelp());
  44 }
  45
  46 bool Instrument::setNoteStart(int note)
  47 {
  48         if(note % 12 == 0 && noteStart >= 0 && noteStart <= 127) {
  49                 noteStart = note;
  50                 return true;
  51         }
  52         else {
  53 //              printf("noteStart=%d is invalid\n", note);
  54                 return false;
  55         }
  56 }
  57
  58 int Instrument::getNoteStart()
  59 {
  60         return noteStart;
  61 }
  62
  63 void Instrument::setStartOctave(int octave)
  64 {
  65         if(setNoteStart((octave) * 12) == false) {
  66                 QMessageBox::warning(parentWidget(), "Error", "Could not set octave. This shouldn't happen!");
  67         }
  68 }
  69
  70 void Instrument::focusOutEvent(QFocusEvent *)
  71 {
  72         setFocus();
  73 }
  74
  75 bool Instrument::event(QEvent *e)
  76 {
  77         if(e->type() == QEvent::KeyPress) {
  78                 QKeyEvent *k = (QKeyEvent *)e;
  79                 keyPressEvent(k);
  80                 if(k->isAccepted() == true) {
  81                         return true;
  82                 }
  83         }
  84         else if(e->type() == QEvent::KeyRelease) {
  85                 QKeyEvent *k = (QKeyEvent *)e;
  86                 keyReleaseEvent(k);
  87                 if(k->isAccepted() == true) {
  88                         return true;
  89                 }
  90         }
  91
  92         return QWidget::event(e);
  93 }
  94
  95 QString Instrument::midi2string(int num)
  96 {
  97         int octave;
  98         for(octave = 0; num >= 12; octave++) {
  99                 num -= 12;
 100         }
 101         return QString(midnotes[num] + " - Octave: " + QString::number(octave - 2)); // Middle C is then "C - Octave: 3"
 102 }
 103
 104 bool Instrument::checkSharp(int note)
 105 {
 106         // This misnamed function checks to see if we are of the the following notes. Useful for string instruments
 107         // These are the notes with only a half-tone gap between them
 108 //1     13      25      37      49      61      73      85      97      109     121
 109 //6     18      30      42      54      66      78      90      102     114     126
 110         if((note - 1) % 12 == 0 || note - 1 == 0)
 111                 return true;
 112         if((note - 6) % 12 == 0 || note - 6 == 0)
 113                 return true;
 114
 115         return false;
 116 }