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

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