gtk2_ardour/midi_streamview.cc

   1 /*
   2     Copyright (C) 2001-2007 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 <cmath>
  20 #include <cassert>
  21 #include <utility>
  22
  23 #include <gtkmm.h>
  24
  25 #include <gtkmm2ext/gtk_ui.h>
  26
  27 #include "ardour/midi_diskstream.h"
  28 #include "ardour/midi_playlist.h"
  29 #include "ardour/midi_region.h"
  30 #include "ardour/midi_source.h"
  31 #include "ardour/midi_track.h"
  32 #include "ardour/region_factory.h"
  33 #include "ardour/smf_source.h"
  34
  35 #include "ardour_ui.h"
  36 #include "canvas-simplerect.h"
  37 #include "gui_thread.h"
  38 #include "lineset.h"
  39 #include "midi_region_view.h"
  40 #include "midi_streamview.h"
  41 #include "midi_time_axis.h"
  42 #include "midi_util.h"
  43 #include "public_editor.h"
  44 #include "region_selection.h"
  45 #include "region_view.h"
  46 #include "rgb_macros.h"
  47 #include "selection.h"
  48 #include "simplerect.h"
  49 #include "utils.h"
  50
  51 using namespace std;
  52 using namespace ARDOUR;
  53 using namespace PBD;
  54 using namespace Editing;
  55
  56 MidiStreamView::MidiStreamView (MidiTimeAxisView& tv)
  57         : StreamView (tv)
  58         , note_range_adjustment(0.0f, 0.0f, 0.0f)
  59         , _range_dirty(false)
  60         , _range_sum_cache(-1.0)
  61         , _lowest_note(60)
  62         , _highest_note(71)
  63         , _data_note_min(60)
  64         , _data_note_max(71)
  65 {
  66         if (tv.is_track()) {
  67                 stream_base_color = ARDOUR_UI::config()->canvasvar_MidiTrackBase.get();
  68         } else {
  69                 stream_base_color = ARDOUR_UI::config()->canvasvar_MidiBusBase.get();
  70         }
  71
  72         use_rec_regions = tv.editor().show_waveforms_recording ();
  73
  74         /* use a group dedicated to MIDI underlays. Audio underlays are not in this group. */
  75         midi_underlay_group = new ArdourCanvas::Group (*canvas_group);
  76         midi_underlay_group->lower_to_bottom();
  77
  78         /* put the note lines in the timeaxisview's group, so it
  79            can be put below ghost regions from MIDI underlays*/
  80         _note_lines = new ArdourCanvas::LineSet(*canvas_group, ArdourCanvas::LineSet::Horizontal);
  81
  82         _note_lines->property_x1() = 0;
  83         _note_lines->property_y1() = 0;
  84         _note_lines->property_x2() = trackview().editor().frame_to_pixel (max_frames);
  85         _note_lines->property_y2() = 0;
  86
  87         _note_lines->signal_event().connect(bind(
  88                         mem_fun(_trackview.editor(), &PublicEditor::canvas_stream_view_event),
  89                         _note_lines, &_trackview));
  90
  91         _note_lines->lower_to_bottom();
  92
  93         ColorsChanged.connect(mem_fun(*this, &MidiStreamView::draw_note_lines));
  94
  95         note_range_adjustment.set_page_size(_highest_note - _lowest_note);
  96         note_range_adjustment.set_value(_lowest_note);
  97
  98         note_range_adjustment.signal_value_changed().connect(
  99                         mem_fun(*this, &MidiStreamView::note_range_adjustment_changed));
 100 }
 101
 102 MidiStreamView::~MidiStreamView ()
 103 {
 104 }
 105
 106 static void
 107 veto_note_range(uint8_t& min, uint8_t& max)
 108 {
 109         /* Legal notes, thanks */
 110         clamp_to_0_127(min);
 111         clamp_to_0_127(max);
 112
 113         /* Always display at least one octave in [0, 127] */
 114         if (max == 127) {
 115                 if (min > (127 - 11)) {
 116                         min = 127 - 11;
 117                 }
 118         } else if (max < min + 11) {
 119                 uint8_t d = 11 - (max - min);
 120                 if (max + d/2 > 127) {
 121                         min -= d;
 122                 } else {
 123                         min -= d / 2;
 124                         max += d / 2;
 125                 }
 126         }
 127         assert(max - min >= 11);
 128         assert(max <= 127);
 129         assert(min <= 127);
 130 }
 131
 132 RegionView*
 133 MidiStreamView::create_region_view (boost::shared_ptr<Region> r, bool /*wfd*/, bool)
 134 {
 135         boost::shared_ptr<MidiRegion> region = boost::dynamic_pointer_cast<MidiRegion> (r);
 136
 137         if (region == 0) {
 138                 return 0;
 139         }
 140
 141         RegionView* region_view = new MidiRegionView (canvas_group, _trackview, region,
 142                                                       _samples_per_unit, region_color);
 143
 144         region_view->init (region_color, false);
 145
 146         return region_view;
 147 }
 148
 149 RegionView*
 150 MidiStreamView::add_region_view_internal (boost::shared_ptr<Region> r, bool wfd, bool recording)
 151 {
 152         boost::shared_ptr<MidiRegion> region = boost::dynamic_pointer_cast<MidiRegion> (r);
 153
 154         if (region == 0) {
 155                 return 0;
 156         }
 157
 158         for (list<RegionView*>::iterator i = region_views.begin(); i != region_views.end(); ++i) {
 159                 if ((*i)->region() == r) {
 160
 161                         /* great. we already have a MidiRegionView for this Region. use it again. */
 162
 163                         (*i)->set_valid (true);
 164
 165                         display_region(dynamic_cast<MidiRegionView*>(*i), wfd);
 166
 167                         return 0;
 168                 }
 169         }
 170
 171         MidiRegionView* region_view = dynamic_cast<MidiRegionView*> (create_region_view (r, wfd, recording));
 172         if (region_view == 0) {
 173                 return 0;
 174         }
 175
 176         region_views.push_front (region_view);
 177
 178         /* display events and find note range */
 179         display_region (region_view, wfd);
 180
 181         /* catch regionview going away */
 182         region->GoingAway.connect (bind (mem_fun (*this, &MidiStreamView::remove_region_view), region));
 183
 184         RegionViewAdded (region_view);
 185
 186         return region_view;
 187 }
 188
 189 void
 190 MidiStreamView::display_region(MidiRegionView* region_view, bool load_model)
 191 {
 192         if ( ! region_view)
 193                 return;
 194
 195         region_view->enable_display(true);
 196
 197         boost::shared_ptr<MidiSource> source(region_view->midi_region()->midi_source(0));
 198
 199         if (load_model) {
 200                 source->load_model();
 201         }
 202
 203         _range_dirty = update_data_note_range(
 204                         source->model()->lowest_note(),
 205                         source->model()->highest_note());
 206
 207         // Display region contents
 208         region_view->set_height(height);
 209         region_view->display_model(source->model());
 210 }
 211
 212 void
 213 MidiStreamView::display_diskstream (boost::shared_ptr<Diskstream> ds)
 214 {
 215         StreamView::display_diskstream(ds);
 216         draw_note_lines();
 217         NoteRangeChanged();
 218 }
 219
 220 void
 221 MidiStreamView::update_contents_metrics(boost::shared_ptr<Region> r)
 222 {
 223         boost::shared_ptr<MidiRegion> mr = boost::dynamic_pointer_cast<MidiRegion>(r);
 224         if (mr) {
 225                 mr->midi_source(0)->load_model();
 226                 _range_dirty = update_data_note_range(
 227                                 mr->model()->lowest_note(),
 228                                 mr->model()->highest_note());
 229         }
 230 }
 231
 232 bool
 233 MidiStreamView::update_data_note_range(uint8_t min, uint8_t max)
 234 {
 235         bool dirty = false;
 236         if (min < _data_note_min) {
 237                 _data_note_min = min;
 238                 dirty = true;
 239         }
 240         if (max > _data_note_max) {
 241                 _data_note_max = max;
 242                 dirty = true;
 243         }
 244         return dirty;
 245 }
 246
 247 void
 248 MidiStreamView::redisplay_diskstream ()
 249 {
 250         if (!_trackview.is_midi_track()) {
 251                 return;
 252         }
 253
 254         list<RegionView*>::iterator i;
 255
 256         // Load models if necessary, and find note range of all our contents
 257         _range_dirty = false;
 258         _data_note_min = 127;
 259         _data_note_max = 0;
 260         _trackview.get_diskstream()->playlist()->foreach_region(
 261                 sigc::mem_fun (*this, &StreamView::update_contents_metrics)
 262                 );
 263
 264         // No notes, use default range
 265         if (!_range_dirty) {
 266                 _data_note_min = 60;
 267                 _data_note_max = 71;
 268         }
 269
 270         // Extend visible range to show newly recorded data, if necessary
 271         _lowest_note  = std::min(_lowest_note, _data_note_min);
 272         _highest_note = std::max(_highest_note, _data_note_max);
 273
 274         veto_note_range(_lowest_note, _highest_note);
 275
 276         // Flag region views as invalid and disable drawing
 277         for (i = region_views.begin(); i != region_views.end(); ++i) {
 278                 (*i)->set_valid(false);
 279                 (*i)->enable_display(false);
 280         }
 281
 282         // Add and display region views, and flag them as valid
 283         _trackview.get_diskstream()->playlist()->foreach_region(
 284                 sigc::hide_return (sigc::mem_fun (*this, &StreamView::add_region_view))
 285                 );
 286
 287         // Stack regions by layer, and remove invalid regions
 288         layer_regions();
 289
 290         // Update note range (not regions which are correct) and draw note lines
 291         apply_note_range(_lowest_note, _highest_note, false);
 292 }
 293
 294
 295 void
 296 MidiStreamView::update_contents_height ()
 297 {
 298         StreamView::update_contents_height();
 299         _note_lines->property_y2() = height;
 300         draw_note_lines();
 301 }
 302
 303 void
 304 MidiStreamView::draw_note_lines()
 305 {
 306         double y;
 307         double prev_y = contents_height();
 308         uint32_t color;
 309
 310         _note_lines->clear();
 311
 312         for (int i = lowest_note(); i <= highest_note(); ++i) {
 313                 y = floor(note_to_y(i));
 314
 315                 _note_lines->add_line(prev_y, 1.0, ARDOUR_UI::config()->canvasvar_PianoRollBlackOutline.get());
 316
 317                 switch (i % 12) {
 318                 case 1:
 319                 case 3:
 320                 case 6:
 321                 case 8:
 322                 case 10:
 323                         color = ARDOUR_UI::config()->canvasvar_PianoRollBlack.get();
 324                         break;
 325                 default:
 326                         color = ARDOUR_UI::config()->canvasvar_PianoRollWhite.get();
 327                         break;
 328                 }
 329
 330                 if (i == highest_note()) {
 331                         _note_lines->add_line(y, prev_y - y, color);
 332                 } else {
 333                         _note_lines->add_line(y + 1.0, prev_y - y - 1.0, color);
 334                 }
 335
 336                 prev_y = y;
 337         }
 338 }
 339
 340 void
 341 MidiStreamView::set_note_range(VisibleNoteRange r)
 342 {
 343         if (r == FullRange) {
 344                 _lowest_note = 0;
 345                 _highest_note = 127;
 346         } else {
 347                 _lowest_note = _data_note_min;
 348                 _highest_note = _data_note_max;
 349         }
 350
 351         apply_note_range(_lowest_note, _highest_note, true);
 352 }
 353
 354 void
 355 MidiStreamView::apply_note_range(uint8_t lowest, uint8_t highest, bool to_region_views)
 356 {
 357         _highest_note = highest;
 358         _lowest_note = lowest;
 359         note_range_adjustment.set_page_size(_highest_note - _lowest_note);
 360         note_range_adjustment.set_value(_lowest_note);
 361         draw_note_lines();
 362
 363         if (to_region_views) {
 364                 for (list<RegionView*>::iterator i = region_views.begin(); i != region_views.end(); ++i) {
 365                         ((MidiRegionView*)(*i))->apply_note_range(lowest, highest);
 366                 }
 367         }
 368
 369         NoteRangeChanged();
 370 }
 371
 372 void
 373 MidiStreamView::update_note_range(uint8_t note_num)
 374 {
 375         assert(note_num <= 127);
 376         _data_note_min = min(_data_note_min, note_num);
 377         _data_note_max = max(_data_note_max, note_num);
 378 }
 379
 380 void
 381 MidiStreamView::setup_rec_box ()
 382 {
 383         // cerr << _trackview.name() << " streamview SRB\n";
 384
 385         if (_trackview.session().transport_rolling()) {
 386
 387                 if (!rec_active &&
 388                     _trackview.session().record_status() == Session::Recording &&
 389                     _trackview.get_diskstream()->record_enabled()) {
 390
 391                         if (use_rec_regions && rec_regions.size() == rec_rects.size()) {
 392
 393                                 /* add a new region, but don't bother if they set use_rec_regions mid-record */
 394
 395                                 MidiRegion::SourceList sources;
 396
 397                                 for (list<sigc::connection>::iterator prc = rec_data_ready_connections.begin();
 398                                                 prc != rec_data_ready_connections.end(); ++prc) {
 399                                         (*prc).disconnect();
 400                                 }
 401                                 rec_data_ready_connections.clear();
 402
 403                                 boost::shared_ptr<MidiDiskstream> mds = _trackview.midi_track()->midi_diskstream();
 404
 405                                 sources.push_back(mds->write_source());
 406
 407                                 rec_data_ready_connections.push_back (mds->write_source()->ViewDataRangeReady.connect (bind (
 408                                                 mem_fun (*this, &MidiStreamView::rec_data_range_ready),
 409                                                 boost::weak_ptr<Source>(mds->write_source()))));
 410
 411                                 // handle multi
 412
 413                                 nframes_t start = 0;
 414                                 if (rec_regions.size() > 0) {
 415                                         start = rec_regions.back().first->start()
 416                                                         + _trackview.get_diskstream()->get_captured_frames(rec_regions.size()-1);
 417                                 }
 418
 419                                 boost::shared_ptr<MidiRegion> region (boost::dynamic_pointer_cast<MidiRegion>
 420                                         (RegionFactory::create (sources, start, 1 , "", 0, Region::DefaultFlags, false)));
 421
 422                                 assert(region);
 423                                 region->block_property_changes ();
 424                                 region->set_position (_trackview.session().transport_frame(), this);
 425                                 rec_regions.push_back (make_pair(region, (RegionView*)0));
 426
 427                                 // rec regions are destroyed in setup_rec_box
 428
 429                                 /* we add the region later */
 430                         }
 431
 432                         /* start a new rec box */
 433
 434                         boost::shared_ptr<MidiTrack> mt = _trackview.midi_track(); /* we know what it is already */
 435                         boost::shared_ptr<MidiDiskstream> ds = mt->midi_diskstream();
 436                         nframes_t frame_pos = ds->current_capture_start ();
 437                         gdouble xstart = _trackview.editor().frame_to_pixel (frame_pos);
 438                         gdouble xend;
 439                         uint32_t fill_color;
 440
 441                         assert(_trackview.midi_track()->mode() == Normal);
 442
 443                         xend = xstart;
 444                         fill_color = ARDOUR_UI::config()->canvasvar_RecordingRect.get();
 445
 446                         ArdourCanvas::SimpleRect * rec_rect = new Gnome::Canvas::SimpleRect (*canvas_group);
 447                         rec_rect->property_x1() = xstart;
 448                         rec_rect->property_y1() = 1.0;
 449                         rec_rect->property_x2() = xend;
 450                         rec_rect->property_y2() = (double) _trackview.current_height() - 1;
 451                         rec_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RecordingRect.get();
 452                         rec_rect->property_fill_color_rgba() = fill_color;
 453                         rec_rect->lower_to_bottom();
 454
 455                         RecBoxInfo recbox;
 456                         recbox.rectangle = rec_rect;
 457                         recbox.start = _trackview.session().transport_frame();
 458                         recbox.length = 0;
 459
 460                         rec_rects.push_back (recbox);
 461
 462                         screen_update_connection.disconnect();
 463                         screen_update_connection = ARDOUR_UI::instance()->SuperRapidScreenUpdate.connect (
 464                                         mem_fun (*this, &MidiStreamView::update_rec_box));
 465                         rec_updating = true;
 466                         rec_active = true;
 467
 468                 } else if (rec_active &&
 469                            (_trackview.session().record_status() != Session::Recording ||
 470                             !_trackview.get_diskstream()->record_enabled())) {
 471                         screen_update_connection.disconnect();
 472                         rec_active = false;
 473                         rec_updating = false;
 474                 }
 475
 476         } else {
 477
 478                 // cerr << "\tNOT rolling, rec_rects = " << rec_rects.size() << " rec_regions = " << rec_regions.size() << endl;
 479
 480                 if (!rec_rects.empty() || !rec_regions.empty()) {
 481
 482                         /* disconnect rapid update */
 483                         screen_update_connection.disconnect();
 484
 485                         for (list<sigc::connection>::iterator prc = rec_data_ready_connections.begin();
 486                                         prc != rec_data_ready_connections.end(); ++prc) {
 487                                 (*prc).disconnect();
 488                         }
 489                         rec_data_ready_connections.clear();
 490
 491                         rec_updating = false;
 492                         rec_active = false;
 493
 494                         /* remove temp regions */
 495
 496                         for (list<pair<boost::shared_ptr<Region>,RegionView*> >::iterator iter = rec_regions.begin(); iter != rec_regions.end();) {
 497                                 list<pair<boost::shared_ptr<Region>,RegionView*> >::iterator tmp;
 498
 499                                 tmp = iter;
 500                                 ++tmp;
 501
 502                                 (*iter).first->drop_references ();
 503
 504                                 iter = tmp;
 505                         }
 506
 507                         rec_regions.clear();
 508
 509                         // cerr << "\tclear " << rec_rects.size() << " rec rects\n";
 510
 511                         /* transport stopped, clear boxes */
 512                         for (vector<RecBoxInfo>::iterator iter=rec_rects.begin(); iter != rec_rects.end(); ++iter) {
 513                                 RecBoxInfo &rect = (*iter);
 514                                 delete rect.rectangle;
 515                         }
 516
 517                         rec_rects.clear();
 518
 519                 }
 520         }
 521 }
 522
 523 void
 524 MidiStreamView::update_rec_regions (boost::shared_ptr<MidiModel> data, nframes_t start, nframes_t dur)
 525 {
 526         ENSURE_GUI_THREAD (bind (mem_fun (*this, &MidiStreamView::update_rec_regions), data, start, dur));
 527
 528         if (use_rec_regions) {
 529
 530                 uint32_t n = 0;
 531                 bool     update_range = false;
 532
 533                 for (list<pair<boost::shared_ptr<Region>,RegionView*> >::iterator iter = rec_regions.begin();
 534                                 iter != rec_regions.end(); n++) {
 535
 536                         list<pair<boost::shared_ptr<Region>,RegionView*> >::iterator tmp = iter;
 537                         ++tmp;
 538
 539                         if (!canvas_item_visible (rec_rects[n].rectangle)) {
 540                                 /* rect already hidden, this region is done */
 541                                 iter = tmp;
 542                                 continue;
 543                         }
 544
 545                         boost::shared_ptr<MidiRegion> region = boost::dynamic_pointer_cast<MidiRegion>(iter->first);
 546                         if (!region) {
 547                                 iter = tmp;
 548                                 continue;
 549                         }
 550
 551                         nframes_t origlen = region->length();
 552
 553                         if (region == rec_regions.back().first && rec_active) {
 554
 555                                 if (start >= region->midi_source(0)->timeline_position()) {
 556
 557                                         nframes_t nlen = start + dur - region->position();
 558
 559                                         if (nlen != region->length()) {
 560
 561                                                 region->freeze ();
 562                                                 region->set_position (_trackview.get_diskstream()->get_capture_start_frame(n), this);
 563                                                 region->set_length (start + dur - region->position(), this);
 564                                                 region->thaw ("updated");
 565
 566                                                 if (origlen == 1) {
 567                                                         /* our special initial length */
 568                                                         iter->second = add_region_view_internal (region, false);
 569                                                         ((MidiRegionView*)iter->second)->begin_write();
 570                                                 }
 571
 572                                                 /* also update rect */
 573                                                 ArdourCanvas::SimpleRect * rect = rec_rects[n].rectangle;
 574                                                 gdouble xend = _trackview.editor().frame_to_pixel (region->position() + region->length());
 575                                                 rect->property_x2() = xend;
 576
 577                                                 ARDOUR::BeatsFramesConverter tconv(_trackview.session(), region->position());
 578                                                 const MidiModel::TimeType start_beats = tconv.from(start);
 579
 580                                                 /* draw events */
 581                                                 MidiRegionView* mrv = (MidiRegionView*)iter->second;
 582
 583                                                 for (MidiModel::Notes::const_iterator i = data->note_lower_bound(start_beats);
 584                                                                 i != data->notes().end(); ++i) {
 585
 586                                                         const boost::shared_ptr<MidiRegionView::NoteType>& note = *i;
 587
 588                                                         nframes_t note_start_frames = tconv.to(note->time());
 589                                                         nframes_t note_end_frames   = tconv.to(note->end_time());
 590
 591                                                         if (note->length() > 0 && note_end_frames + region->position() > start)
 592                                                                 mrv->resolve_note(note->note(), note_end_frames);
 593
 594                                                         if (note_start_frames + region->position() < start) {
 595                                                                 continue;
 596                                                         }
 597
 598                                                         if (note_start_frames + region->position() > start + dur) {
 599                                                                 break;
 600                                                         }
 601
 602                                                         if (note->note() < _lowest_note) {
 603                                                                 _lowest_note = note->note();
 604                                                                 update_range = true;
 605                                                         } else if (note->note() > _highest_note) {
 606                                                                 _highest_note = note->note();
 607                                                                 update_range = true;
 608                                                         }
 609
 610                                                         mrv->add_note (note, !update_range);
 611                                                 }
 612
 613                                                 mrv->extend_active_notes();
 614                                         }
 615                                 }
 616
 617                         } else {
 618
 619                                 nframes_t nlen = _trackview.get_diskstream()->get_captured_frames(n);
 620
 621                                 if (nlen != region->length()) {
 622
 623                                         if (region->source_length(0) >= region->position() + nlen) {
 624
 625                                                 region->freeze ();
 626                                                 region->set_position (_trackview.get_diskstream()->get_capture_start_frame(n), this);
 627                                                 region->set_length (nlen, this);
 628                                                 region->thaw ("updated");
 629
 630                                                 if (origlen == 1) {
 631                                                         /* our special initial length */
 632                                                         iter->second = add_region_view_internal (region, false);
 633                                                 }
 634
 635                                                 /* also hide rect */
 636                                                 ArdourCanvas::Item * rect = rec_rects[n].rectangle;
 637                                                 rect->hide();
 638
 639                                         }
 640                                 }
 641                         }
 642
 643                         iter = tmp;
 644                 }
 645
 646                 if (update_range)
 647                         update_contents_height();
 648         }
 649 }
 650
 651 void
 652 MidiStreamView::rec_data_range_ready (nframes_t start, nframes_t cnt, boost::weak_ptr<Source> weak_src)
 653 {
 654         // this is called from the butler thread for now
 655
 656         ENSURE_GUI_THREAD(bind (mem_fun (*this, &MidiStreamView::rec_data_range_ready), start, cnt, weak_src));
 657
 658         boost::shared_ptr<SMFSource> src (boost::dynamic_pointer_cast<SMFSource>(weak_src.lock()));
 659
 660         if (!src) {
 661                 return;
 662         }
 663
 664         if (start + cnt > last_rec_data_frame) {
 665                 last_rec_data_frame = start + cnt;
 666         }
 667
 668         this->update_rec_regions (src->model(), start, cnt);
 669 }
 670
 671 void
 672 MidiStreamView::color_handler ()
 673 {
 674         //case cMidiTrackBase:
 675         if (_trackview.is_midi_track()) {
 676                 //canvas_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MidiTrackBase.get();
 677         }
 678
 679         //case cMidiBusBase:
 680         if (!_trackview.is_midi_track()) {
 681                 //canvas_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MidiBusBase.get();;
 682         }
 683 }
 684
 685 void
 686 MidiStreamView::note_range_adjustment_changed()
 687 {
 688         double sum = note_range_adjustment.get_value() + note_range_adjustment.get_page_size();
 689         int lowest = (int) floor(note_range_adjustment.get_value());
 690         int highest;
 691
 692         if (sum == _range_sum_cache) {
 693                 //cerr << "cached" << endl;
 694                 highest = (int) floor(sum);
 695         } else {
 696                 //cerr << "recalc" << endl;
 697                 highest = lowest + (int) floor(note_range_adjustment.get_page_size());
 698                 _range_sum_cache = sum;
 699         }
 700
 701         if (lowest == _lowest_note && highest == _highest_note) {
 702                 return;
 703         }
 704
 705         //cerr << "note range adjustment changed: " << lowest << " " << highest << endl;
 706         //cerr << "  val=" << v_zoom_adjustment.get_value() << " page=" << v_zoom_adjustment.get_page_size() << " sum=" << v_zoom_adjustment.get_value() + v_zoom_adjustment.get_page_size() << endl;
 707
 708         _lowest_note = lowest;
 709         _highest_note = highest;
 710         apply_note_range(lowest, highest, true);
 711 }
 712