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 <iostream>
  20 #include "evoral/midi_events.h"
  21 #include "ardour/midi_track.h"
  22
  23 #include "gtkmm2ext/keyboard.h"
  24
  25 #include "piano_roll_header.h"
  26 #include "midi_time_axis.h"
  27 #include "midi_streamview.h"
  28
  29 const int no_note = 0xff;
  30
  31 using namespace std;
  32 using namespace Gtkmm2ext;
  33
  34 PianoRollHeader::Color PianoRollHeader::white = PianoRollHeader::Color(0.77f, 0.78f, 0.76f);
  35 PianoRollHeader::Color PianoRollHeader::white_highlight = PianoRollHeader::Color(0.87f, 0.88f, 0.86f);
  36 PianoRollHeader::Color PianoRollHeader::white_shade_light = PianoRollHeader::Color(0.95f, 0.95f, 0.95f);
  37 PianoRollHeader::Color PianoRollHeader::white_shade_dark = PianoRollHeader::Color(0.56f, 0.56f, 0.56f);
  38
  39 PianoRollHeader::Color PianoRollHeader::black = PianoRollHeader::Color(0.24f, 0.24f, 0.24f);
  40 PianoRollHeader::Color PianoRollHeader::black_highlight = PianoRollHeader::Color(0.30f, 0.30f, 0.30f);
  41 PianoRollHeader::Color PianoRollHeader::black_shade_light = PianoRollHeader::Color(0.46f, 0.46f, 0.46f);
  42 PianoRollHeader::Color PianoRollHeader::black_shade_dark = PianoRollHeader::Color(0.1f, 0.1f, 0.1f);
  43
  44 PianoRollHeader::Color::Color()
  45         : r(1.0f)
  46         , g(1.0f)
  47         , b(1.0f)
  48 {
  49 }
  50
  51 PianoRollHeader::Color::Color(double _r, double _g, double _b)
  52         : r(_r)
  53         , g(_g)
  54         , b(_b)
  55 {
  56 }
  57
  58 inline void
  59 PianoRollHeader::Color::set(const PianoRollHeader::Color& c)
  60 {
  61         r = c.r;
  62         g = c.g;
  63         b = c.b;
  64 }
  65
  66 PianoRollHeader::PianoRollHeader(MidiStreamView& v)
  67         : _view(v)
  68         , _highlighted_note(no_note)
  69         , _clicked_note(no_note)
  70         , _dragging(false)
  71 {
  72         add_events (Gdk::BUTTON_PRESS_MASK |
  73                     Gdk::BUTTON_RELEASE_MASK |
  74                     Gdk::POINTER_MOTION_MASK |
  75                     Gdk::ENTER_NOTIFY_MASK |
  76                     Gdk::LEAVE_NOTIFY_MASK |
  77                     Gdk::SCROLL_MASK);
  78
  79         for (int i = 0; i < 128; ++i) {
  80                 _active_notes[i] = false;
  81         }
  82
  83         _view.NoteRangeChanged.connect (sigc::mem_fun (*this, &PianoRollHeader::note_range_changed));
  84 }
  85
  86 inline void
  87 create_path(Cairo::RefPtr<Cairo::Context> cr, double x[], double y[], int start, int stop)
  88 {
  89         cr->move_to(x[start], y[start]);
  90
  91         for (int i = start+1; i <= stop; ++i) {
  92                 cr->line_to(x[i], y[i]);
  93         }
  94 }
  95
  96 inline void
  97 render_rect(Cairo::RefPtr<Cairo::Context> cr, int /*note*/, double x[], double y[],
  98              PianoRollHeader::Color& bg, PianoRollHeader::Color& tl_shadow, PianoRollHeader::Color& br_shadow)
  99 {
 100         cr->set_source_rgb(bg.r, bg.g, bg.b);
 101         create_path(cr, x, y, 0, 4);
 102         cr->fill();
 103
 104         cr->set_source_rgb(tl_shadow.r, tl_shadow.g, tl_shadow.b);
 105         create_path(cr, x, y, 0, 2);
 106         cr->stroke();
 107
 108         cr->set_source_rgb(br_shadow.r, br_shadow.g, br_shadow.b);
 109         create_path(cr, x, y, 2, 4);
 110         cr->stroke();
 111 }
 112
 113 inline void
 114 render_cf(Cairo::RefPtr<Cairo::Context> cr, int /*note*/, double x[], double y[],
 115                 PianoRollHeader::Color& bg, PianoRollHeader::Color& tl_shadow, PianoRollHeader::Color& br_shadow)
 116 {
 117         cr->set_source_rgb(bg.r, bg.g, bg.b);
 118         create_path(cr, x, y, 0, 6);
 119         cr->fill();
 120
 121         cr->set_source_rgb(tl_shadow.r, tl_shadow.g, tl_shadow.b);
 122         create_path(cr, x, y, 0, 4);
 123         cr->stroke();
 124
 125         cr->set_source_rgb(br_shadow.r, br_shadow.g, br_shadow.b);
 126         create_path(cr, x, y, 4, 6);
 127         cr->stroke();
 128 }
 129
 130 inline void
 131 render_eb(Cairo::RefPtr<Cairo::Context> cr, int /*note*/, double x[], double y[],
 132                 PianoRollHeader::Color& bg, PianoRollHeader::Color& tl_shadow, PianoRollHeader::Color& br_shadow)
 133 {
 134         cr->set_source_rgb(bg.r, bg.g, bg.b);
 135         create_path(cr, x, y, 0, 6);
 136         cr->fill();
 137
 138         cr->set_source_rgb(tl_shadow.r, tl_shadow.g, tl_shadow.b);
 139         create_path(cr, x, y, 0, 2);
 140         cr->stroke();
 141         create_path(cr, x, y, 4, 5);
 142         cr->stroke();
 143
 144         cr->set_source_rgb(br_shadow.r, br_shadow.g, br_shadow.b);
 145         create_path(cr, x, y, 2, 4);
 146         cr->stroke();
 147         create_path(cr, x, y, 5, 6);
 148         cr->stroke();
 149 }
 150
 151 inline void
 152 render_dga(Cairo::RefPtr<Cairo::Context> cr, int /*note*/, double x[], double y[],
 153                  PianoRollHeader::Color& bg, PianoRollHeader::Color& tl_shadow, PianoRollHeader::Color& br_shadow)
 154 {
 155         cr->set_source_rgb(bg.r, bg.g, bg.b);
 156         create_path(cr, x, y, 0, 8);
 157         cr->fill();
 158
 159         cr->set_source_rgb(tl_shadow.r, tl_shadow.g, tl_shadow.b);
 160         create_path(cr, x, y, 0, 4);
 161         cr->stroke();
 162         create_path(cr, x, y, 6, 7);
 163         cr->stroke();
 164
 165         cr->set_source_rgb(br_shadow.r, br_shadow.g, br_shadow.b);
 166         create_path(cr, x, y, 4, 6);
 167         cr->stroke();
 168         create_path(cr, x, y, 7, 8);
 169         cr->stroke();
 170 }
 171
 172 void
 173 PianoRollHeader::get_path(PianoRollHeader::ItemType note_type, int note, double x[], double y[])
 174 {
 175         double y_pos = floor(_view.note_to_y(note)) - 0.5f;
 176         double note_height;
 177         double other_y1 = floor(_view.note_to_y(note+1)) + floor(_note_height / 2.0f) + 0.5f;
 178         double other_y2 = floor(_view.note_to_y(note-1)) + floor(_note_height / 2.0f) - 1.0f;
 179         double width = get_width();
 180
 181         if (note == 0) {
 182                 note_height = floor(_view.contents_height()) - y_pos;
 183         } else {
 184                 note_height = floor(_view.note_to_y(note - 1)) - y_pos;
 185         }
 186
 187         switch (note_type) {
 188         case BLACK_SEPARATOR:
 189                 x[0] = 1.5f;
 190                 y[0] = y_pos;
 191                 x[1] = _black_note_width;
 192                 y[1] = y_pos;
 193                 break;
 194         case BLACK_MIDDLE_SEPARATOR:
 195                 x[0] = _black_note_width;
 196                 y[0] = y_pos + floor(_note_height / 2.0f);
 197                 x[1] = width - 1.0f;
 198                 y[1] = y[0];
 199                 break;
 200         case BLACK:
 201                 x[0] = 1.5f;
 202                 y[0] = y_pos + note_height - 0.5f;
 203                 x[1] = 1.5f;
 204                 y[1] = y_pos + 1.0f;
 205                 x[2] = _black_note_width;
 206                 y[2] = y_pos + 1.0f;
 207                 x[3] = _black_note_width;
 208                 y[3] = y_pos + note_height - 0.5f;
 209                 x[4] = 1.5f;
 210                 y[4] = y_pos + note_height - 0.5f;
 211                 return;
 212         case WHITE_SEPARATOR:
 213                 x[0] = 1.5f;
 214                 y[0] = y_pos;
 215                 x[1] = width - 1.5f;
 216                 y[1] = y_pos;
 217                 break;
 218         case WHITE_RECT:
 219                 x[0] = 1.5f;
 220                 y[0] = y_pos + note_height - 0.5f;
 221                 x[1] = 1.5f;
 222                 y[1] = y_pos + 1.0f;
 223                 x[2] = width - 1.5f;
 224                 y[2] = y_pos + 1.0f;
 225                 x[3] = width - 1.5f;
 226                 y[3] = y_pos + note_height - 0.5f;
 227                 x[4] = 1.5f;
 228                 y[4] = y_pos + note_height - 0.5f;
 229                 return;
 230         case WHITE_CF:
 231                 x[0] = 1.5f;
 232                 y[0] = y_pos + note_height - 1.5f;
 233                 x[1] = 1.5f;
 234                 y[1] = y_pos + 1.0f;
 235                 x[2] = _black_note_width + 1.0f;
 236                 y[2] = y_pos + 1.0f;
 237                 x[3] = _black_note_width + 1.0f;
 238                 y[3] = other_y1;
 239                 x[4] = width - 1.5f;
 240                 y[4] = other_y1;
 241                 x[5] = width - 1.5f;
 242                 y[5] = y_pos + note_height - 1.5f;
 243                 x[6] = 1.5f;
 244                 y[6] = y_pos + note_height - 1.5f;
 245                 return;
 246         case WHITE_EB:
 247                 x[0] = 1.5f;
 248                 y[0] = y_pos + note_height - 1.5f;
 249                 x[1] = 1.5f;
 250                 y[1] = y_pos + 1.0f;
 251                 x[2] = width - 1.5f;
 252                 y[2] = y_pos + 1.0f;
 253                 x[3] = width - 1.5f;
 254                 y[3] = other_y2;
 255                 x[4] = _black_note_width + 1.0f;
 256                 y[4] = other_y2;
 257                 x[5] = _black_note_width + 1.0f;
 258                 y[5] = y_pos + note_height - 1.5f;
 259                 x[6] = 1.5f;
 260                 y[6] = y_pos + note_height - 1.5f;
 261                 return;
 262         case WHITE_DGA:
 263                 x[0] = 1.5f;
 264                 y[0] = y_pos + note_height - 1.5f;
 265                 x[1] = 1.5f;
 266                 y[1] = y_pos + 1.0f;
 267                 x[2] = _black_note_width + 1.0f;
 268                 y[2] = y_pos + 1.0f;
 269                 x[3] = _black_note_width + 1.0f;
 270                 y[3] = other_y1;
 271                 x[4] = width - 1.5f;
 272                 y[4] = other_y1;
 273                 x[5] = width - 1.5f;
 274                 y[5] = other_y2;
 275                 x[6] = _black_note_width + 1.0f;
 276                 y[6] = other_y2;
 277                 x[7] = _black_note_width + 1.0f;
 278                 y[7] = y_pos + note_height - 1.5f;
 279                 x[8] = 1.5f;
 280                 y[8] = y_pos + note_height - 1.5f;
 281                 return;
 282         default:
 283                 return;
 284         }
 285 }
 286
 287 bool
 288 PianoRollHeader::on_expose_event (GdkEventExpose* ev)
 289 {
 290         GdkRectangle& rect = ev->area;
 291         double font_size;
 292         int lowest, highest;
 293         Cairo::RefPtr<Cairo::Context> cr = get_window()->create_cairo_context();
 294         Cairo::RefPtr<Cairo::LinearGradient> pat = Cairo::LinearGradient::create(0, 0, _black_note_width, 0);
 295         double x[9];
 296         double y[9];
 297         Color bg, tl_shadow, br_shadow;
 298         int oct_rel;
 299         int y1 = max(rect.y, 0);
 300         int y2 = min(rect.y + rect.height, (int) floor(_view.contents_height() - 1.0f));
 301
 302         //Cairo::TextExtents te;
 303         lowest = max(_view.lowest_note(), _view.y_to_note(y2));
 304         highest = min(_view.highest_note(), _view.y_to_note(y1));
 305
 306         if (lowest > 127) {
 307                 lowest = 0;
 308         }
 309
 310         cr->select_font_face ("Georgia", Cairo::FONT_SLANT_NORMAL, Cairo::FONT_WEIGHT_BOLD);
 311         font_size = min((double) 10.0f, _note_height - 4.0f);
 312         cr->set_font_size(font_size);
 313
 314         /* fill the entire rect with the color for non-highlighted white notes.
 315          * then we won't have to draw the background for those notes,
 316          * and would only have to draw the background for the one highlighted white note*/
 317         //cr->rectangle(rect.x, rect.y, rect.width, rect.height);
 318         //cr->set_source_rgb(white.r, white.g, white.b);
 319         //cr->fill();
 320
 321         cr->set_line_width(1.0f);
 322
 323         /* draw vertical lines with shade at both ends of the widget */
 324         cr->set_source_rgb(0.0f, 0.0f, 0.0f);
 325         cr->move_to(0.5f, rect.y);
 326         cr->line_to(0.5f, rect.y + rect.height);
 327         cr->stroke();
 328         cr->move_to(get_width() - 0.5f, rect.y);
 329         cr->line_to(get_width() - 0.5f, rect.y + rect.height);
 330         cr->stroke();
 331
 332         //pat->add_color_stop_rgb(0.0, 0.33, 0.33, 0.33);
 333         //pat->add_color_stop_rgb(0.2, 0.39, 0.39, 0.39);
 334         //pat->add_color_stop_rgb(1.0, 0.22, 0.22, 0.22);
 335         //cr->set_source(pat);
 336
 337         for (int i = lowest; i <= highest; ++i) {
 338                 oct_rel = i % 12;
 339
 340                 switch (oct_rel) {
 341                 case 1:
 342                 case 3:
 343                 case 6:
 344                 case 8:
 345                 case 10:
 346                         /* black note */
 347                         if (i == _highlighted_note) {
 348                                 bg.set(black_highlight);
 349                         } else {
 350                                 bg.set(black);
 351                         }
 352
 353                         if (_active_notes[i]) {
 354                                 tl_shadow.set(black_shade_dark);
 355                                 br_shadow.set(black_shade_light);
 356                         } else {
 357                                 tl_shadow.set(black_shade_light);
 358                                 br_shadow.set(black_shade_dark);
 359                         }
 360
 361                         /* draw black separators */
 362                         cr->set_source_rgb(0.0f, 0.0f, 0.0f);
 363                         get_path(BLACK_SEPARATOR, i, x, y);
 364                         create_path(cr, x, y, 0, 1);
 365                         cr->stroke();
 366
 367                         get_path(BLACK_MIDDLE_SEPARATOR, i, x, y);
 368                         create_path(cr, x, y, 0, 1);
 369                         cr->stroke();
 370
 371                         get_path(BLACK, i, x, y);
 372                         render_rect(cr, i, x, y, bg, tl_shadow, br_shadow);
 373                         break;
 374
 375                 default:
 376                         /* white note */
 377                         if (i == _highlighted_note) {
 378                                 bg.set(white_highlight);
 379                         } else {
 380                                 bg.set(white);
 381                         }
 382
 383                         if (_active_notes[i]) {
 384                                 tl_shadow.set(white_shade_dark);
 385                                 br_shadow.set(white_shade_light);
 386                         } else {
 387                                 tl_shadow.set(white_shade_light);
 388                                 br_shadow.set(white_shade_dark);
 389                         }
 390
 391                         switch(oct_rel) {
 392                         case 0:
 393                         case 5:
 394                                 if (i == _view.highest_note()) {
 395                                         get_path(WHITE_RECT, i, x, y);
 396                                         render_rect(cr, i, x, y, bg, tl_shadow, br_shadow);
 397                                 } else {
 398                                         get_path(WHITE_CF, i, x, y);
 399                                         render_cf(cr, i, x, y, bg, tl_shadow, br_shadow);
 400                                 }
 401                                 break;
 402
 403                         case 2:
 404                         case 7:
 405                         case 9:
 406                                 if (i == _view.highest_note()) {
 407                                         get_path(WHITE_EB, i, x, y);
 408                                         render_eb(cr, i, x, y, bg, tl_shadow, br_shadow);
 409                                 } else if (i == _view.lowest_note()) {
 410                                         get_path(WHITE_CF, i, x, y);
 411                                         render_cf(cr, i, x, y, bg, tl_shadow, br_shadow);
 412                                 } else {
 413                                         get_path(WHITE_DGA, i, x, y);
 414                                         render_dga(cr, i, x, y, bg, tl_shadow, br_shadow);
 415                                 }
 416                                 break;
 417
 418                         case 4:
 419                         case 11:
 420                                 cr->set_source_rgb(0.0f, 0.0f, 0.0f);
 421                                 get_path(WHITE_SEPARATOR, i, x, y);
 422                                 create_path(cr, x, y, 0, 1);
 423                                 cr->stroke();
 424
 425                                 if (i == _view.lowest_note()) {
 426                                         get_path(WHITE_RECT, i, x, y);
 427                                         render_rect(cr, i, x, y, bg, tl_shadow, br_shadow);
 428                                 } else {
 429                                         get_path(WHITE_EB, i, x, y);
 430                                         render_eb(cr, i, x, y, bg, tl_shadow, br_shadow);
 431                                 }
 432                                 break;
 433
 434                         default:
 435                                 break;
 436
 437                         }
 438                         break;
 439
 440                 }
 441
 442                 /* render the name of which C this is */
 443                 if (oct_rel == 0) {
 444                         std::stringstream s;
 445                         double y = floor(_view.note_to_y(i)) - 0.5f;
 446                         double note_height = floor(_view.note_to_y(i - 1)) - y;
 447
 448                         int cn = i / 12;
 449                         s << "C" << cn;
 450
 451                         //cr->get_text_extents(s.str(), te);
 452                         cr->set_source_rgb(0.30f, 0.30f, 0.30f);
 453                         cr->move_to(2.0f, y + note_height - 1.0f - (note_height - font_size) / 2.0f);
 454                         cr->show_text(s.str());
 455                 }
 456         }
 457
 458         return true;
 459 }
 460
 461 bool
 462 PianoRollHeader::on_motion_notify_event (GdkEventMotion* ev)
 463 {
 464         if (_dragging) {
 465
 466                 int note = _view.y_to_note(ev->y);
 467
 468                 if (_highlighted_note != no_note) {
 469                         if (note > _highlighted_note) {
 470                                 invalidate_note_range(_highlighted_note, note);
 471                         } else {
 472                                 invalidate_note_range(note, _highlighted_note);
 473                         }
 474
 475                         _highlighted_note = note;
 476                 }
 477
 478                 /* redraw already taken care of above */
 479                 if (_clicked_note != no_note && _clicked_note != note) {
 480                         _active_notes[_clicked_note] = false;
 481                         send_note_off(_clicked_note);
 482
 483                         _clicked_note = note;
 484
 485                         if (!_active_notes[note]) {
 486                                 _active_notes[note] = true;
 487                                 send_note_on(note);
 488                         }
 489                 }
 490         }
 491
 492         //win->process_updates(false);
 493
 494         return true;
 495 }
 496
 497 bool
 498 PianoRollHeader::on_button_press_event (GdkEventButton* ev)
 499 {
 500         int note = _view.y_to_note(ev->y);
 501
 502         if (ev->button == 2) {
 503                 send_note_on (note);
 504                 /* relax till release */
 505         } else {
 506
 507                 if (ev->type == GDK_BUTTON_PRESS && note >= 0 && note < 128) {
 508
 509                         add_modal_grab();
 510                         _dragging = true;
 511
 512                         if (!_active_notes[note]) {
 513                                 _active_notes[note] = true;
 514                                 _clicked_note = note;
 515                                 send_note_on(note);
 516
 517                                 invalidate_note_range(note, note);
 518                         } else {
 519                                 _clicked_note = no_note;
 520                         }
 521                 }
 522         }
 523
 524         return true;
 525 }
 526
 527 bool
 528 PianoRollHeader::on_button_release_event (GdkEventButton* ev)
 529 {
 530         int note = _view.y_to_note(ev->y);
 531
 532         if (ev->button == 2) {
 533                 send_note_off (note);
 534
 535                 if (Keyboard::no_modifiers_active (ev->state)) {
 536                         AddNoteSelection (note); // EMIT SIGNAL
 537                 } else if (Keyboard::modifier_state_equals (ev->state, Keyboard::PrimaryModifier)) {
 538                         ToggleNoteSelection (note); // EMIT SIGNAL
 539                 } else if (Keyboard::modifier_state_equals (ev->state, Keyboard::RangeSelectModifier)) {
 540                         ExtendNoteSelection (note); // EMIT SIGNAL
 541                 }
 542
 543         } else {
 544
 545                 if (_dragging) {
 546                         remove_modal_grab();
 547                         _dragging = false;
 548
 549                         if (note == _clicked_note) {
 550                                 _active_notes[note] = false;
 551                                 _clicked_note = no_note;
 552                                 send_note_off(note);
 553
 554                                 invalidate_note_range(note, note);
 555                         }
 556                 }
 557         }
 558
 559         return true;
 560 }
 561
 562 bool
 563 PianoRollHeader::on_enter_notify_event (GdkEventCrossing* ev)
 564 {
 565         _highlighted_note = _view.y_to_note(ev->y);
 566
 567         invalidate_note_range(_highlighted_note, _highlighted_note);
 568         return true;
 569 }
 570
 571 bool
 572 PianoRollHeader::on_leave_notify_event (GdkEventCrossing*)
 573 {
 574         invalidate_note_range(_highlighted_note, _highlighted_note);
 575
 576         if (_clicked_note != no_note) {
 577                 _active_notes[_clicked_note] = false;
 578                 send_note_off(_clicked_note);
 579
 580                 if (_clicked_note != _highlighted_note) {
 581                         invalidate_note_range(_clicked_note, _clicked_note);
 582                 }
 583
 584                 _clicked_note = no_note;
 585         }
 586
 587         _highlighted_note = no_note;
 588         return true;
 589 }
 590
 591 bool
 592 PianoRollHeader::on_scroll_event (GdkEventScroll*)
 593 {
 594         return true;
 595 }
 596
 597 void
 598 PianoRollHeader::note_range_changed()
 599 {
 600         _note_height = floor(_view.note_height()) + 0.5f;
 601
 602         queue_draw();
 603
 604         Glib::RefPtr<Gdk::Window> win = get_window();
 605
 606         if (win) {
 607                 win->process_updates(false);
 608         }
 609 }
 610
 611 void
 612 PianoRollHeader::invalidate_note_range(int lowest, int highest)
 613 {
 614         Glib::RefPtr<Gdk::Window> win = get_window();
 615         Gdk::Rectangle rect;
 616
 617         // the non-rectangular geometry of some of the notes requires more
 618         // redraws than the notes that actually changed.
 619         switch(lowest % 12) {
 620         case 0:
 621         case 5:
 622                 lowest = max((int) _view.lowest_note(), lowest);
 623                 break;
 624         default:
 625                 lowest = max((int) _view.lowest_note(), lowest - 1);
 626                 break;
 627         }
 628
 629         switch(highest % 12) {
 630         case 4:
 631         case 11:
 632                 highest = min((int) _view.highest_note(), highest);
 633                 break;
 634         case 1:
 635         case 3:
 636         case 6:
 637         case 8:
 638         case 10:
 639                 highest = min((int) _view.highest_note(), highest + 1);
 640                 break;
 641         default:
 642                 highest = min((int) _view.highest_note(), highest + 2);
 643                 break;
 644         }
 645
 646         double y = _view.note_to_y(highest);
 647         double height = _view.note_to_y(lowest - 1) - y;
 648
 649         rect.set_x(0);
 650         rect.set_width(get_width());
 651         rect.set_y((int) floor(y));
 652         rect.set_height((int) floor(height));
 653
 654         if (win) {
 655                 win->invalidate_rect(rect, false);
 656         }
 657 }
 658
 659 void
 660 PianoRollHeader::on_size_request(Gtk::Requisition* r)
 661 {
 662         r->width = 20;
 663 }
 664
 665 void
 666 PianoRollHeader::on_size_allocate(Gtk::Allocation& a)
 667 {
 668         DrawingArea::on_size_allocate(a);
 669
 670         _black_note_width = floor(0.7 * get_width()) + 0.5f;
 671 }
 672
 673 void
 674 PianoRollHeader::send_note_on(uint8_t note)
 675 {
 676         boost::shared_ptr<ARDOUR::MidiTrack> track = _view.trackview().midi_track();
 677
 678         //cerr << "note on: " << (int) note << endl;
 679
 680         if (track) {
 681                 _event[0] = (MIDI_CMD_NOTE_ON | track->default_channel());
 682                 _event[1] = note;
 683                 _event[2] = 100;
 684
 685                 track->write_immediate_event(3, _event);
 686         }
 687 }
 688
 689 void
 690 PianoRollHeader::send_note_off(uint8_t note)
 691 {
 692         boost::shared_ptr<ARDOUR::MidiTrack> track = _view.trackview().midi_track();
 693
 694         if (track) {
 695                 _event[0] = (MIDI_CMD_NOTE_OFF | track->default_channel());
 696                 _event[1] = note;
 697                 _event[2] = 100;
 698
 699                 track->write_immediate_event(3, _event);
 700         }
 701 }
 702