gtk2_ardour/piano_roll_header.cc

   1 /*
   2     Copyright (C) 2008 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17 */
  18
  19 #include <ardour/midi_track.h>
  20
  21 #include "piano_roll_header.h"
  22 #include "midi_time_axis.h"
  23 #include "midi_streamview.h"
  24
  25 #include <iostream>
  26
  27 const int no_note = 0xff;
  28
  29 using namespace std;
  30
  31 PianoRollHeader::Color PianoRollHeader::white = PianoRollHeader::Color(0.77f, 0.78f, 0.76f);
  32 PianoRollHeader::Color PianoRollHeader::white_highlight = PianoRollHeader::Color(0.87f, 0.88f, 0.86f);
  33 PianoRollHeader::Color PianoRollHeader::white_shade_light = PianoRollHeader::Color(0.95f, 0.95f, 0.95f);
  34 PianoRollHeader::Color PianoRollHeader::white_shade_dark = PianoRollHeader::Color(0.56f, 0.56f, 0.56f);
  35
  36 PianoRollHeader::Color PianoRollHeader::black = PianoRollHeader::Color(0.24f, 0.24f, 0.24f);
  37 PianoRollHeader::Color PianoRollHeader::black_highlight = PianoRollHeader::Color(0.30f, 0.30f, 0.30f);
  38 PianoRollHeader::Color PianoRollHeader::black_shade_light = PianoRollHeader::Color(0.46f, 0.46f, 0.46f);
  39 PianoRollHeader::Color PianoRollHeader::black_shade_dark = PianoRollHeader::Color(0.1f, 0.1f, 0.1f);
  40
  41 PianoRollHeader::Color::Color()
  42         : r(1.0f)
  43         , g(1.0f)
  44         , b(1.0f) {
  45 }
  46
  47 PianoRollHeader::Color::Color(double _r, double _g, double _b)
  48         : r(_r)
  49         , g(_g)
  50         , b(_b) {
  51 }
  52
  53 inline void
  54 PianoRollHeader::Color::set(const PianoRollHeader::Color& c) {
  55         r = c.r;
  56         g = c.g;
  57         b = c.b;
  58 }
  59
  60 PianoRollHeader::PianoRollHeader(MidiStreamView& v)
  61         : _view(v)
  62         , _highlighted_note(no_note)
  63         , _clicked_note(no_note) {
  64
  65         add_events (Gdk::BUTTON_PRESS_MASK |
  66                     Gdk::BUTTON_RELEASE_MASK |
  67                     Gdk::POINTER_MOTION_MASK |
  68                     Gdk::ENTER_NOTIFY_MASK |
  69                     Gdk::LEAVE_NOTIFY_MASK |
  70                     Gdk::SCROLL_MASK);
  71
  72         for(int i = 0; i < 128; ++i) {
  73                 _active_notes[i] = false;
  74         }
  75
  76         _view.NoteRangeChanged.connect (mem_fun (*this, &PianoRollHeader::note_range_changed));
  77 }
  78
  79 inline void
  80 create_path(Cairo::RefPtr<Cairo::Context> cr, double x[], double y[], int start, int stop) {
  81         cr->move_to(x[start], y[start]);
  82
  83         for(int i = start+1; i <= stop; ++i) {
  84                 cr->line_to(x[i], y[i]);
  85         }
  86 }
  87
  88 inline void
  89 render_rect(Cairo::RefPtr<Cairo::Context> cr, int note, double x[], double y[],
  90              PianoRollHeader::Color& bg, PianoRollHeader::Color& tl_shadow, PianoRollHeader::Color& br_shadow) {
  91         cr->set_source_rgb(bg.r, bg.g, bg.b);
  92         create_path(cr, x, y, 0, 4);
  93         cr->fill();
  94
  95         cr->set_source_rgb(tl_shadow.r, tl_shadow.g, tl_shadow.b);
  96         create_path(cr, x, y, 0, 2);
  97         cr->stroke();
  98
  99         cr->set_source_rgb(br_shadow.r, br_shadow.g, br_shadow.b);
 100         create_path(cr, x, y, 2, 4);
 101         cr->stroke();
 102 }
 103
 104 inline void
 105 render_cf(Cairo::RefPtr<Cairo::Context> cr, int note, double x[], double y[],
 106                 PianoRollHeader::Color& bg, PianoRollHeader::Color& tl_shadow, PianoRollHeader::Color& br_shadow) {
 107         cr->set_source_rgb(bg.r, bg.g, bg.b);
 108         create_path(cr, x, y, 0, 6);
 109         cr->fill();
 110
 111         cr->set_source_rgb(tl_shadow.r, tl_shadow.g, tl_shadow.b);
 112         create_path(cr, x, y, 0, 4);
 113         cr->stroke();
 114
 115         cr->set_source_rgb(br_shadow.r, br_shadow.g, br_shadow.b);
 116         create_path(cr, x, y, 4, 6);
 117         cr->stroke();
 118 }
 119
 120 inline void
 121 render_eb(Cairo::RefPtr<Cairo::Context> cr, int note, double x[], double y[],
 122                 PianoRollHeader::Color& bg, PianoRollHeader::Color& tl_shadow, PianoRollHeader::Color& br_shadow) {
 123         cr->set_source_rgb(bg.r, bg.g, bg.b);
 124         create_path(cr, x, y, 0, 6);
 125         cr->fill();
 126
 127         cr->set_source_rgb(tl_shadow.r, tl_shadow.g, tl_shadow.b);
 128         create_path(cr, x, y, 0, 2);
 129         cr->stroke();
 130         create_path(cr, x, y, 4, 5);
 131         cr->stroke();
 132
 133         cr->set_source_rgb(br_shadow.r, br_shadow.g, br_shadow.b);
 134         create_path(cr, x, y, 2, 4);
 135         cr->stroke();
 136         create_path(cr, x, y, 5, 6);
 137         cr->stroke();
 138 }
 139
 140 inline void
 141 render_dga(Cairo::RefPtr<Cairo::Context> cr, int note, double x[], double y[],
 142                  PianoRollHeader::Color& bg, PianoRollHeader::Color& tl_shadow, PianoRollHeader::Color& br_shadow) {
 143         cr->set_source_rgb(bg.r, bg.g, bg.b);
 144         create_path(cr, x, y, 0, 8);
 145         cr->fill();
 146
 147         cr->set_source_rgb(tl_shadow.r, tl_shadow.g, tl_shadow.b);
 148         create_path(cr, x, y, 0, 4);
 149         cr->stroke();
 150         create_path(cr, x, y, 6, 7);
 151         cr->stroke();
 152
 153         cr->set_source_rgb(br_shadow.r, br_shadow.g, br_shadow.b);
 154         create_path(cr, x, y, 4, 6);
 155         cr->stroke();
 156         create_path(cr, x, y, 7, 8);
 157         cr->stroke();
 158 }
 159
 160 void
 161 PianoRollHeader::get_path(PianoRollHeader::ItemType note_type, int note, double x[], double y[]) {
 162         double y_pos = floor(_view.note_to_y(note)) - 0.5f;
 163         double note_height;
 164         double other_y1 = floor(_view.note_to_y(note+1)) + floor(_note_height / 2.0f) + 0.5f;
 165         double other_y2 = floor(_view.note_to_y(note-1)) + floor(_note_height / 2.0f) - 1.0f;
 166         double width = get_width();
 167
 168         if(note == 0) {
 169                 note_height = floor(_view.contents_height()) - y_pos;
 170         }
 171         else {
 172                 note_height = floor(_view.note_to_y(note - 1)) - y_pos;
 173         }
 174
 175         switch(note_type) {
 176         case BLACK_SEPARATOR:
 177                 x[0] = 1.5f;
 178                 y[0] = y_pos;
 179                 x[1] = _black_note_width;
 180                 y[1] = y_pos;
 181                 break;
 182         case BLACK_MIDDLE_SEPARATOR:
 183                 x[0] = _black_note_width;
 184                 y[0] = y_pos + floor(_note_height / 2.0f);
 185                 x[1] = width - 1.0f;
 186                 y[1] = y[0];
 187                 break;
 188         case BLACK:
 189                 x[0] = 1.5f;
 190                 y[0] = y_pos + note_height - 0.5f;
 191                 x[1] = 1.5f;
 192                 y[1] = y_pos + 1.0f;
 193                 x[2] = _black_note_width;
 194                 y[2] = y_pos + 1.0f;
 195                 x[3] = _black_note_width;
 196                 y[3] = y_pos + note_height - 0.5f;
 197                 x[4] = 1.5f;
 198                 y[4] = y_pos + note_height - 0.5f;
 199                 return;
 200         case WHITE_SEPARATOR:
 201                 x[0] = 1.5f;
 202                 y[0] = y_pos;
 203                 x[1] = width - 1.5f;
 204                 y[1] = y_pos;
 205                 break;
 206         case WHITE_RECT:
 207                 x[0] = 1.5f;
 208                 y[0] = y_pos + note_height - 0.5f;
 209                 x[1] = 1.5f;
 210                 y[1] = y_pos + 1.0f;
 211                 x[2] = width - 1.5f;
 212                 y[2] = y_pos + 1.0f;
 213                 x[3] = width - 1.5f;
 214                 y[3] = y_pos + note_height - 0.5f;
 215                 x[4] = 1.5f;
 216                 y[4] = y_pos + note_height - 0.5f;
 217                 return;
 218         case WHITE_CF:
 219                 x[0] = 1.5f;
 220                 y[0] = y_pos + note_height - 1.5f;
 221                 x[1] = 1.5f;
 222                 y[1] = y_pos + 1.0f;
 223                 x[2] = _black_note_width + 1.0f;
 224                 y[2] = y_pos + 1.0f;
 225                 x[3] = _black_note_width + 1.0f;
 226                 y[3] = other_y1;
 227                 x[4] = width - 1.5f;
 228                 y[4] = other_y1;
 229                 x[5] = width - 1.5f;
 230                 y[5] = y_pos + note_height - 1.5f;
 231                 x[6] = 1.5f;
 232                 y[6] = y_pos + note_height - 1.5f;
 233                 return;
 234         case WHITE_EB:
 235                 x[0] = 1.5f;
 236                 y[0] = y_pos + note_height - 1.5f;
 237                 x[1] = 1.5f;
 238                 y[1] = y_pos + 1.0f;
 239                 x[2] = width - 1.5f;
 240                 y[2] = y_pos + 1.0f;
 241                 x[3] = width - 1.5f;
 242                 y[3] = other_y2;
 243                 x[4] = _black_note_width + 1.0f;
 244                 y[4] = other_y2;
 245                 x[5] = _black_note_width + 1.0f;
 246                 y[5] = y_pos + note_height - 1.5f;
 247                 x[6] = 1.5f;
 248                 y[6] = y_pos + note_height - 1.5f;
 249                 return;
 250         case WHITE_DGA:
 251                 x[0] = 1.5f;
 252                 y[0] = y_pos + note_height - 1.5f;
 253                 x[1] = 1.5f;
 254                 y[1] = y_pos + 1.0f;
 255                 x[2] = _black_note_width + 1.0f;
 256                 y[2] = y_pos + 1.0f;
 257                 x[3] = _black_note_width + 1.0f;
 258                 y[3] = other_y1;
 259                 x[4] = width - 1.5f;
 260                 y[4] = other_y1;
 261                 x[5] = width - 1.5f;
 262                 y[5] = other_y2;
 263                 x[6] = _black_note_width + 1.0f;
 264                 y[6] = other_y2;
 265                 x[7] = _black_note_width + 1.0f;
 266                 y[7] = y_pos + note_height - 1.5f;
 267                 x[8] = 1.5f;
 268                 y[8] = y_pos + note_height - 1.5f;
 269                 return;
 270         default:
 271                 return;
 272         }
 273 }
 274
 275 bool
 276 PianoRollHeader::on_expose_event (GdkEventExpose* ev) {
 277         GdkRectangle& rect = ev->area;
 278         double font_size;
 279         int lowest, highest;
 280         Cairo::RefPtr<Cairo::Context> cr = get_window()->create_cairo_context();
 281         Cairo::RefPtr<Cairo::LinearGradient> pat = Cairo::LinearGradient::create(0, 0, _black_note_width, 0);
 282         double x[9];
 283         double y[9];
 284         Color bg, tl_shadow, br_shadow;
 285         int oct_rel;
 286         int y1 = max(rect.y, 0);
 287         int y2 = min(rect.y + rect.height, (int) floor(_view.contents_height() - 1.0f));
 288
 289         //Cairo::TextExtents te;
 290         lowest = max(_view.lowest_note(), _view.y_to_note(y2));
 291         highest = min(_view.highest_note(), _view.y_to_note(y1));
 292
 293         if(lowest > 127) {
 294                 lowest = 0;
 295         }
 296
 297         cr->select_font_face ("Georgia", Cairo::FONT_SLANT_NORMAL, Cairo::FONT_WEIGHT_BOLD);
 298         font_size = min(10.0, _note_height);
 299         cr->set_font_size(font_size);
 300
 301         /* fill the entire rect with the color for non-highlighted white notes.
 302          * then we won't have to draw the background for those notes,
 303          * and would only have to draw the background for the one highlighted white note*/
 304         //cr->rectangle(rect.x, rect.y, rect.width, rect.height);
 305         //cr->set_source_rgb(white.r, white.g, white.b);
 306         //cr->fill();
 307
 308         cr->set_line_width(1.0f);
 309
 310         /* draw vertical lines with shade at both ends of the widget */
 311         cr->set_source_rgb(0.0f, 0.0f, 0.0f);
 312         cr->move_to(0.5f, rect.y);
 313         cr->line_to(0.5f, rect.y + rect.height);
 314         cr->stroke();
 315         cr->move_to(get_width() - 0.5f, rect.y);
 316         cr->line_to(get_width() - 0.5f, rect.y + rect.height);
 317         cr->stroke();
 318
 319         //pat->add_color_stop_rgb(0.0, 0.33, 0.33, 0.33);
 320         //pat->add_color_stop_rgb(0.2, 0.39, 0.39, 0.39);
 321         //pat->add_color_stop_rgb(1.0, 0.22, 0.22, 0.22);
 322         //cr->set_source(pat);
 323
 324         for(int i = lowest; i <= highest; ++i) {
 325                 oct_rel = i % 12;
 326
 327                 switch(oct_rel) {
 328                 case 1:
 329                 case 3:
 330                 case 6:
 331                 case 8:
 332                 case 10:
 333                         /* black note */
 334                         if(i == _highlighted_note) {
 335                                 bg.set(black_highlight);
 336                         }
 337                         else {
 338                                 bg.set(black);
 339                         }
 340
 341                         if(_active_notes[i]) {
 342                                 tl_shadow.set(black_shade_dark);
 343                                 br_shadow.set(black_shade_light);
 344                         }
 345                         else {
 346                                 tl_shadow.set(black_shade_light);
 347                                 br_shadow.set(black_shade_dark);
 348                         }
 349
 350                         /* draw black separators */
 351                         cr->set_source_rgb(0.0f, 0.0f, 0.0f);
 352                         get_path(BLACK_SEPARATOR, i, x, y);
 353                         create_path(cr, x, y, 0, 1);
 354                         cr->stroke();
 355
 356                         get_path(BLACK_MIDDLE_SEPARATOR, i, x, y);
 357                         create_path(cr, x, y, 0, 1);
 358                         cr->stroke();
 359
 360                         get_path(BLACK, i, x, y);
 361                         render_rect(cr, i, x, y, bg, tl_shadow, br_shadow);
 362                         break;
 363
 364                 default:
 365                         /* white note */
 366                         if(i == _highlighted_note) {
 367                                 bg.set(white_highlight);
 368                         }
 369                         else {
 370                                 bg.set(white);
 371                         }
 372
 373                         if(_active_notes[i]) {
 374                                 tl_shadow.set(white_shade_dark);
 375                                 br_shadow.set(white_shade_light);
 376                         }
 377                         else {
 378                                 tl_shadow.set(white_shade_light);
 379                                 br_shadow.set(white_shade_dark);
 380                         }
 381
 382                         switch(oct_rel) {
 383                         case 0:
 384                         case 5:
 385                                 if(i == _view.highest_note()) {
 386                                         get_path(WHITE_RECT, i, x, y);
 387                                         render_rect(cr, i, x, y, bg, tl_shadow, br_shadow);
 388                                 }
 389                                 else {
 390                                         get_path(WHITE_CF, i, x, y);
 391                                         render_cf(cr, i, x, y, bg, tl_shadow, br_shadow);
 392                                 }
 393                                 break;
 394
 395                         case 2:
 396                         case 7:
 397                         case 9:
 398                                 if(i == _view.highest_note()) {
 399                                         get_path(WHITE_EB, i, x, y);
 400                                         render_eb(cr, i, x, y, bg, tl_shadow, br_shadow);
 401                                 }
 402                                 else if(i == _view.lowest_note()) {
 403                                         get_path(WHITE_CF, i, x, y);
 404                                         render_cf(cr, i, x, y, bg, tl_shadow, br_shadow);
 405                                 }
 406                                 else {
 407                                         get_path(WHITE_DGA, i, x, y);
 408                                         render_dga(cr, i, x, y, bg, tl_shadow, br_shadow);
 409                                 }
 410                                 break;
 411
 412                         case 4:
 413                         case 11:
 414                                 cr->set_source_rgb(0.0f, 0.0f, 0.0f);
 415                                 get_path(WHITE_SEPARATOR, i, x, y);
 416                                 create_path(cr, x, y, 0, 1);
 417                                 cr->stroke();
 418
 419                                 if(i == _view.lowest_note()) {
 420                                         get_path(WHITE_RECT, i, x, y);
 421                                         render_rect(cr, i, x, y, bg, tl_shadow, br_shadow);
 422                                 }
 423                                 else {
 424                                         get_path(WHITE_EB, i, x, y);
 425                                         render_eb(cr, i, x, y, bg, tl_shadow, br_shadow);
 426                                 }
 427                                 break;
 428
 429                         default:
 430                                 break;
 431
 432                         }
 433                         break;
 434
 435                 }
 436
 437                 /* render the name of which C this is */
 438                 if(oct_rel == 0) {
 439                         std::stringstream s;
 440                         double y = floor(_view.note_to_y(i)) - 0.5f;
 441                         double note_height = floor(_view.note_to_y(i - 1)) - y;
 442
 443                         int cn = i / 12;
 444                         s << "C" << cn;
 445
 446                         //cr->get_text_extents(s.str(), te);
 447                         cr->set_source_rgb(0.30f, 0.30f, 0.30f);
 448                         cr->move_to(0, y + font_size + (note_height - font_size) / 2.0f);
 449                         cr->show_text(s.str());
 450                 }
 451         }
 452
 453         return true;
 454 }
 455
 456 bool
 457 PianoRollHeader::on_motion_notify_event (GdkEventMotion* ev) {
 458         int note = _view.y_to_note(ev->y);
 459
 460         if(_highlighted_note != no_note) {
 461                 if(note > _highlighted_note) {
 462                         invalidate_note_range(_highlighted_note, note);
 463                 }
 464                 else {
 465                         invalidate_note_range(note, _highlighted_note);
 466                 }
 467
 468                 _highlighted_note = note;
 469         }
 470
 471         /* redraw already taken care of above */
 472         if(_clicked_note != no_note && _clicked_note != note) {
 473                 _active_notes[_clicked_note] = false;
 474                 send_note_off(_clicked_note);
 475
 476                 _clicked_note = note;
 477
 478                 if(!_active_notes[note]) {
 479                         _active_notes[note] = true;
 480                         send_note_on(note);
 481                 }
 482         }
 483
 484         //win->process_updates(false);
 485
 486         return true;
 487 }
 488
 489 bool
 490 PianoRollHeader::on_button_press_event (GdkEventButton* ev) {
 491         int note = _view.y_to_note(ev->y);
 492
 493         if(ev->type == GDK_BUTTON_PRESS && note >= 0 && note < 128) {
 494                 if(!_active_notes[note]) {
 495                         _active_notes[note] = true;
 496                         _clicked_note = note;
 497                         send_note_on(note);
 498
 499                         invalidate_note_range(note, note);
 500                 }
 501                 else {
 502                         _clicked_note = no_note;
 503                 }
 504         }
 505
 506         return true;
 507 }
 508
 509 bool
 510 PianoRollHeader::on_button_release_event (GdkEventButton* ev) {
 511         int note = _view.y_to_note(ev->y);
 512
 513         if(note == _clicked_note) {
 514                 _active_notes[note] = false;
 515                 _clicked_note = no_note;
 516                 send_note_off(note);
 517
 518                 invalidate_note_range(note, note);
 519         }
 520
 521         return true;
 522 }
 523
 524 bool
 525 PianoRollHeader::on_enter_notify_event (GdkEventCrossing* ev) {
 526         _highlighted_note = _view.y_to_note(ev->y);
 527         invalidate_note_range(_highlighted_note, _highlighted_note);
 528         return true;
 529 }
 530
 531 bool
 532 PianoRollHeader::on_leave_notify_event (GdkEventCrossing*) {
 533         invalidate_note_range(_highlighted_note, _highlighted_note);
 534
 535         if(_clicked_note != no_note) {
 536                 _active_notes[_clicked_note] = false;
 537                 send_note_off(_clicked_note);
 538
 539                 if(_clicked_note != _highlighted_note) {
 540                         invalidate_note_range(_clicked_note, _clicked_note);
 541                 }
 542
 543                 _clicked_note = no_note;
 544         }
 545
 546         _highlighted_note = no_note;
 547         return true;
 548 }
 549
 550 bool
 551 PianoRollHeader::on_scroll_event (GdkEventScroll* ev) {
 552         return true;
 553 }
 554
 555 void
 556 PianoRollHeader::note_range_changed() {
 557         _note_height = floor(_view.note_height()) + 0.5f;
 558
 559         queue_draw();
 560
 561         Glib::RefPtr<Gdk::Window> win = get_window();
 562
 563         if(win) {
 564                 win->process_updates(false);
 565         }
 566 }
 567
 568 void
 569 PianoRollHeader::invalidate_note_range(int lowest, int highest) {
 570         Glib::RefPtr<Gdk::Window> win = get_window();
 571         Gdk::Rectangle rect;
 572
 573         // the non-rectangular geometry of some of the notes requires more
 574         // redraws than the notes that actually changed.
 575         switch(lowest % 12) {
 576         case 0:
 577         case 5:
 578                 lowest = max((int) _view.lowest_note(), lowest);
 579                 break;
 580         default:
 581                 lowest = max((int) _view.lowest_note(), lowest - 1);
 582                 break;
 583         }
 584
 585         switch(highest % 12) {
 586         case 4:
 587         case 11:
 588                 highest = min((int) _view.highest_note(), highest);
 589                 break;
 590         case 1:
 591         case 3:
 592         case 6:
 593         case 8:
 594         case 10:
 595                 highest = min((int) _view.highest_note(), highest + 1);
 596                 break;
 597         default:
 598                 highest = min((int) _view.highest_note(), highest + 2);
 599                 break;
 600         }
 601
 602         double y = _view.note_to_y(highest);
 603         double height = _view.note_to_y(lowest - 1) - y;
 604
 605         rect.set_x(0);
 606         rect.set_width(get_width());
 607         rect.set_y((int) floor(y));
 608         rect.set_height((int) floor(height));
 609
 610         if(win) {
 611                 win->invalidate_rect(rect, false);
 612         }
 613 }
 614
 615 void
 616 PianoRollHeader::on_size_request(Gtk::Requisition* r) {
 617         r->width = 20;
 618 }
 619
 620 void
 621 PianoRollHeader::on_size_allocate(Gtk::Allocation& a) {
 622         DrawingArea::on_size_allocate(a);
 623
 624         _black_note_width = floor(0.7 * get_width()) + 0.5f;
 625 }
 626
 627 void
 628 PianoRollHeader::send_note_on(uint8_t note) {
 629         boost::shared_ptr<ARDOUR::MidiTrack> track = _view.trackview().midi_track();
 630
 631         //cerr << "note on: " << (int) note << endl;
 632
 633         if(track) {
 634                 _event[0] = MIDI_CMD_NOTE_ON;
 635                 _event[1] = note;
 636                 _event[2] = 100;
 637
 638                 track->write_immediate_event(3, _event);
 639         }
 640 }
 641
 642 void
 643 PianoRollHeader::send_note_off(uint8_t note) {
 644         boost::shared_ptr<ARDOUR::MidiTrack> track = _view.trackview().midi_track();
 645
 646         if(track) {
 647                 _event[0] = MIDI_CMD_NOTE_OFF;
 648                 _event[1] = note;
 649                 _event[2] = 100;
 650
 651                 track->write_immediate_event(3, _event);
 652         }
 653 }