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 #include "ardour/session.h"
  35
  36 #include "ardour_ui.h"
  37 #include "canvas-simplerect.h"
  38 #include "gui_thread.h"
  39 #include "lineset.h"
  40 #include "midi_region_view.h"
  41 #include "midi_streamview.h"
  42 #include "midi_time_axis.h"
  43 #include "midi_util.h"
  44 #include "public_editor.h"
  45 #include "region_selection.h"
  46 #include "region_view.h"
  47 #include "rgb_macros.h"
  48 #include "selection.h"
  49 #include "simplerect.h"
  50 #include "utils.h"
  51
  52 using namespace std;
  53 using namespace ARDOUR;
  54 using namespace PBD;
  55 using namespace Editing;
  56
  57 MidiStreamView::MidiStreamView (MidiTimeAxisView& tv)
  58         : StreamView (tv)
  59         , note_range_adjustment(0.0f, 0.0f, 0.0f)
  60         , _range_dirty(false)
  61         , _range_sum_cache(-1.0)
  62         , _lowest_note(60)
  63         , _highest_note(71)
  64         , _data_note_min(60)
  65         , _data_note_max(71)
  66 {
  67         if (tv.is_track()) {
  68                 stream_base_color = ARDOUR_UI::config()->canvasvar_MidiTrackBase.get();
  69         } else {
  70                 stream_base_color = ARDOUR_UI::config()->canvasvar_MidiBusBase.get();
  71         }
  72
  73         /* use a group dedicated to MIDI underlays. Audio underlays are not in this group. */
  74         midi_underlay_group = new ArdourCanvas::Group (*_canvas_group);
  75         midi_underlay_group->lower_to_bottom();
  76
  77         /* put the note lines in the timeaxisview's group, so it
  78            can be put below ghost regions from MIDI underlays*/
  79         _note_lines = new ArdourCanvas::LineSet(*_canvas_group, ArdourCanvas::LineSet::Horizontal);
  80
  81         _note_lines->property_x1() = 0;
  82         _note_lines->property_y1() = 0;
  83         _note_lines->property_x2() = trackview().editor().frame_to_pixel (max_frames);
  84         _note_lines->property_y2() = 0;
  85
  86         _note_lines->signal_event().connect(sigc::bind(
  87                         sigc::mem_fun(_trackview.editor(), &PublicEditor::canvas_stream_view_event),
  88                         _note_lines, &_trackview));
  89
  90         _note_lines->lower_to_bottom();
  91
  92         ColorsChanged.connect(sigc::mem_fun(*this, &MidiStreamView::draw_note_lines));
  93
  94         note_range_adjustment.set_page_size(_highest_note - _lowest_note);
  95         note_range_adjustment.set_value(_lowest_note);
  96
  97         note_range_adjustment.signal_value_changed().connect(
  98                         sigc::mem_fun(*this, &MidiStreamView::note_range_adjustment_changed));
  99 }
 100
 101 MidiStreamView::~MidiStreamView ()
 102 {
 103 }
 104
 105 static void
 106 veto_note_range(uint8_t& min, uint8_t& max)
 107 {
 108         /* Legal notes, thanks */
 109         clamp_to_0_127(min);
 110         clamp_to_0_127(max);
 111
 112         /* Always display at least one octave in [0, 127] */
 113         if (max == 127) {
 114                 if (min > (127 - 11)) {
 115                         min = 127 - 11;
 116                 }
 117         } else if (max < min + 11) {
 118                 uint8_t d = 11 - (max - min);
 119                 if (max + d/2 > 127) {
 120                         min -= d;
 121                 } else {
 122                         min -= d / 2;
 123                         max += d / 2;
 124                 }
 125         }
 126         assert(max - min >= 11);
 127         assert(max <= 127);
 128         assert(min <= 127);
 129 }
 130
 131 RegionView*
 132 MidiStreamView::create_region_view (boost::shared_ptr<Region> r, bool /*wfd*/, bool)
 133 {
 134         boost::shared_ptr<MidiRegion> region = boost::dynamic_pointer_cast<MidiRegion> (r);
 135
 136         if (region == 0) {
 137                 return 0;
 138         }
 139
 140         RegionView* region_view = new MidiRegionView (_canvas_group, _trackview, region,
 141                                                       _samples_per_unit, region_color);
 142
 143         region_view->init (region_color, false);
 144
 145         return region_view;
 146 }
 147
 148 RegionView*
 149 MidiStreamView::add_region_view_internal (boost::shared_ptr<Region> r, bool wfd, bool recording)
 150 {
 151         boost::shared_ptr<MidiRegion> region = boost::dynamic_pointer_cast<MidiRegion> (r);
 152
 153         if (region == 0) {
 154                 return 0;
 155         }
 156
 157         for (list<RegionView*>::iterator i = region_views.begin(); i != region_views.end(); ++i) {
 158                 if ((*i)->region() == r) {
 159
 160                         /* great. we already have a MidiRegionView for this Region. use it again. */
 161
 162                         (*i)->set_valid (true);
 163
 164                         display_region(dynamic_cast<MidiRegionView*>(*i), wfd);
 165
 166                         return 0;
 167                 }
 168         }
 169
 170         MidiRegionView* region_view = dynamic_cast<MidiRegionView*> (create_region_view (r, wfd, recording));
 171         if (region_view == 0) {
 172                 return 0;
 173         }
 174
 175         region_views.push_front (region_view);
 176
 177         /* display events and find note range */
 178         display_region (region_view, wfd);
 179
 180         /* catch regionview going away */
 181         region->DropReferences.connect (*this, invalidator (*this), boost::bind (&MidiStreamView::remove_region_view, this, region), gui_context());
 182
 183         RegionViewAdded (region_view);
 184
 185         return region_view;
 186 }
 187
 188 void
 189 MidiStreamView::display_region(MidiRegionView* region_view, bool load_model)
 190 {
 191         if ( ! region_view)
 192                 return;
 193
 194         region_view->enable_display(true);
 195
 196         boost::shared_ptr<MidiSource> source(region_view->midi_region()->midi_source(0));
 197
 198         if (load_model) {
 199                 source->load_model();
 200         }
 201
 202         _range_dirty = update_data_note_range(
 203                         source->model()->lowest_note(),
 204                         source->model()->highest_note());
 205
 206         // Display region contents
 207         region_view->set_height(height);
 208         region_view->display_model(source->model());
 209 }
 210
 211 void
 212 MidiStreamView::display_track (boost::shared_ptr<Track> tr)
 213 {
 214         StreamView::display_track (tr);
 215         draw_note_lines();
 216         NoteRangeChanged();
 217 }
 218
 219 void
 220 MidiStreamView::update_contents_metrics(boost::shared_ptr<Region> r)
 221 {
 222         boost::shared_ptr<MidiRegion> mr = boost::dynamic_pointer_cast<MidiRegion>(r);
 223         if (mr) {
 224                 mr->midi_source(0)->load_model();
 225                 _range_dirty = update_data_note_range(
 226                                 mr->model()->lowest_note(),
 227                                 mr->model()->highest_note());
 228         }
 229 }
 230
 231 bool
 232 MidiStreamView::update_data_note_range(uint8_t min, uint8_t max)
 233 {
 234         bool dirty = false;
 235         if (min < _data_note_min) {
 236                 _data_note_min = min;
 237                 dirty = true;
 238         }
 239         if (max > _data_note_max) {
 240                 _data_note_max = max;
 241                 dirty = true;
 242         }
 243         return dirty;
 244 }
 245
 246 void
 247 MidiStreamView::redisplay_track ()
 248 {
 249         if (!_trackview.is_midi_track()) {
 250                 return;
 251         }
 252
 253         list<RegionView*>::iterator i;
 254
 255         // Load models if necessary, and find note range of all our contents
 256         _range_dirty = false;
 257         _data_note_min = 127;
 258         _data_note_max = 0;
 259         _trackview.track()->playlist()->foreach_region(
 260                 sigc::mem_fun (*this, &StreamView::update_contents_metrics)
 261                 );
 262
 263         // No notes, use default range
 264         if (!_range_dirty) {
 265                 _data_note_min = 60;
 266                 _data_note_max = 71;
 267         }
 268
 269         // Extend visible range to show newly recorded data, if necessary
 270         _lowest_note  = std::min(_lowest_note, _data_note_min);
 271         _highest_note = std::max(_highest_note, _data_note_max);
 272
 273         veto_note_range(_lowest_note, _highest_note);
 274
 275         // Flag region views as invalid and disable drawing
 276         for (i = region_views.begin(); i != region_views.end(); ++i) {
 277                 (*i)->set_valid(false);
 278                 (*i)->enable_display(false);
 279         }
 280
 281         // Add and display region views, and flag them as valid
 282         _trackview.track()->playlist()->foreach_region(
 283                 sigc::hide_return (sigc::mem_fun (*this, &StreamView::add_region_view))
 284                 );
 285
 286         // Stack regions by layer, and remove invalid regions
 287         layer_regions();
 288
 289         // Update note range (not regions which are correct) and draw note lines
 290         apply_note_range(_lowest_note, _highest_note, false);
 291 }
 292
 293
 294 void
 295 MidiStreamView::update_contents_height ()
 296 {
 297         StreamView::update_contents_height();
 298         _note_lines->property_y2() = height;
 299         draw_note_lines();
 300 }
 301
 302 void
 303 MidiStreamView::draw_note_lines()
 304 {
 305         double y;
 306         double prev_y = contents_height();
 307         uint32_t color;
 308
 309         _note_lines->clear();
 310
 311         for (int i = lowest_note(); i <= highest_note(); ++i) {
 312                 y = floor(note_to_y(i));
 313
 314                 _note_lines->add_line(prev_y, 1.0, ARDOUR_UI::config()->canvasvar_PianoRollBlackOutline.get());
 315
 316                 switch (i % 12) {
 317                 case 1:
 318                 case 3:
 319                 case 6:
 320                 case 8:
 321                 case 10:
 322                         color = ARDOUR_UI::config()->canvasvar_PianoRollBlack.get();
 323                         break;
 324                 default:
 325                         color = ARDOUR_UI::config()->canvasvar_PianoRollWhite.get();
 326                         break;
 327                 }
 328
 329                 if (i == highest_note()) {
 330                         _note_lines->add_line(y, prev_y - y, color);
 331                 } else {
 332                         _note_lines->add_line(y + 1.0, prev_y - y - 1.0, color);
 333                 }
 334
 335                 prev_y = y;
 336         }
 337 }
 338
 339 void
 340 MidiStreamView::set_note_range(VisibleNoteRange r)
 341 {
 342         if (r == FullRange) {
 343                 _lowest_note = 0;
 344                 _highest_note = 127;
 345         } else {
 346                 _lowest_note = _data_note_min;
 347                 _highest_note = _data_note_max;
 348         }
 349
 350         apply_note_range(_lowest_note, _highest_note, true);
 351 }
 352
 353 void
 354 MidiStreamView::apply_note_range(uint8_t lowest, uint8_t highest, bool to_region_views)
 355 {
 356         _highest_note = highest;
 357         _lowest_note = lowest;
 358         note_range_adjustment.set_page_size(_highest_note - _lowest_note);
 359         note_range_adjustment.set_value(_lowest_note);
 360         draw_note_lines();
 361
 362         if (to_region_views) {
 363                 for (list<RegionView*>::iterator i = region_views.begin(); i != region_views.end(); ++i) {
 364                         ((MidiRegionView*)(*i))->apply_note_range(lowest, highest);
 365                 }
 366         }
 367
 368         NoteRangeChanged();
 369 }
 370
 371 void
 372 MidiStreamView::update_note_range(uint8_t note_num)
 373 {
 374         assert(note_num <= 127);
 375         _data_note_min = min(_data_note_min, note_num);
 376         _data_note_max = max(_data_note_max, note_num);
 377 }
 378
 379 void
 380 MidiStreamView::setup_rec_box ()
 381 {
 382         // cerr << _trackview.name() << " streamview SRB\n";
 383
 384         if (_trackview.session()->transport_rolling()) {
 385
 386                 if (!rec_active &&
 387                     _trackview.session()->record_status() == Session::Recording &&
 388                     _trackview.track()->record_enabled()) {
 389
 390                         if (Config->get_show_waveforms_while_recording() && rec_regions.size() == rec_rects.size()) {
 391
 392                                 /* add a new region, but don't bother if they set show-waveforms-while-recording mid-record */
 393
 394                                 MidiRegion::SourceList sources;
 395
 396                                 rec_data_ready_connections.drop_connections ();
 397
 398                                 sources.push_back (_trackview.midi_track()->write_source());
 399
 400                                 _trackview.midi_track()->write_source()->ViewDataRangeReady.connect
 401                                         (rec_data_ready_connections,
 402                                          invalidator (*this),
 403                                          ui_bind (&MidiStreamView::rec_data_range_ready, this, _1, _2, boost::weak_ptr<Source>(_trackview.midi_track()->write_source())),
 404                                          gui_context());
 405
 406                                 // handle multi
 407
 408                                 nframes_t start = 0;
 409                                 if (rec_regions.size() > 0) {
 410                                         start = rec_regions.back().first->start()
 411                                                         + _trackview.track()->get_captured_frames(rec_regions.size()-1);
 412                                 }
 413
 414                                 PropertyList plist;
 415
 416                                 plist.add (ARDOUR::Properties::start, start);
 417                                 plist.add (ARDOUR::Properties::length, 1);
 418                                 plist.add (ARDOUR::Properties::name, string());
 419                                 plist.add (ARDOUR::Properties::layer, 0);
 420
 421                                 boost::shared_ptr<MidiRegion> region (boost::dynamic_pointer_cast<MidiRegion>
 422                                                                       (RegionFactory::create (sources, plist, false)));
 423
 424                                 assert(region);
 425                                 region->block_property_changes ();
 426                                 region->set_position (_trackview.session()->transport_frame(), this);
 427                                 rec_regions.push_back (make_pair(region, (RegionView*)0));
 428
 429                                 // rec regions are destroyed in setup_rec_box
 430
 431                                 /* we add the region later */
 432                         }
 433
 434                         /* start a new rec box */
 435
 436                         boost::shared_ptr<MidiTrack> mt = _trackview.midi_track(); /* we know what it is already */
 437                         nframes_t frame_pos = mt->current_capture_start ();
 438                         gdouble xstart = _trackview.editor().frame_to_pixel (frame_pos);
 439                         gdouble xend;
 440                         uint32_t fill_color;
 441
 442                         assert(_trackview.midi_track()->mode() == Normal);
 443
 444                         xend = xstart;
 445                         fill_color = ARDOUR_UI::config()->canvasvar_RecordingRect.get();
 446
 447                         ArdourCanvas::SimpleRect * rec_rect = new Gnome::Canvas::SimpleRect (*_canvas_group);
 448                         rec_rect->property_x1() = xstart;
 449                         rec_rect->property_y1() = 1.0;
 450                         rec_rect->property_x2() = xend;
 451                         rec_rect->property_y2() = (double) _trackview.current_height() - 1;
 452                         rec_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RecordingRect.get();
 453                         rec_rect->property_fill_color_rgba() = fill_color;
 454                         rec_rect->lower_to_bottom();
 455
 456                         RecBoxInfo recbox;
 457                         recbox.rectangle = rec_rect;
 458                         recbox.start = _trackview.session()->transport_frame();
 459                         recbox.length = 0;
 460
 461                         rec_rects.push_back (recbox);
 462
 463                         screen_update_connection.disconnect();
 464                         screen_update_connection = ARDOUR_UI::instance()->SuperRapidScreenUpdate.connect (
 465                                         sigc::mem_fun (*this, &MidiStreamView::update_rec_box));
 466                         rec_updating = true;
 467                         rec_active = true;
 468
 469                 } else if (rec_active &&
 470                            (_trackview.session()->record_status() != Session::Recording ||
 471                             !_trackview.track()->record_enabled())) {
 472                         screen_update_connection.disconnect();
 473                         rec_active = false;
 474                         rec_updating = false;
 475                 }
 476
 477         } else {
 478
 479                 // cerr << "\tNOT rolling, rec_rects = " << rec_rects.size() << " rec_regions = " << rec_regions.size() << endl;
 480
 481                 if (!rec_rects.empty() || !rec_regions.empty()) {
 482
 483                         /* disconnect rapid update */
 484                         screen_update_connection.disconnect();
 485                         rec_data_ready_connections.drop_connections ();
 486
 487                         rec_updating = false;
 488                         rec_active = false;
 489
 490                         /* remove temp regions */
 491
 492                         for (list<pair<boost::shared_ptr<Region>,RegionView*> >::iterator iter = rec_regions.begin(); iter != rec_regions.end();) {
 493                                 list<pair<boost::shared_ptr<Region>,RegionView*> >::iterator tmp;
 494
 495                                 tmp = iter;
 496                                 ++tmp;
 497
 498                                 (*iter).first->drop_references ();
 499
 500                                 iter = tmp;
 501                         }
 502
 503                         rec_regions.clear();
 504
 505                         // cerr << "\tclear " << rec_rects.size() << " rec rects\n";
 506
 507                         /* transport stopped, clear boxes */
 508                         for (vector<RecBoxInfo>::iterator iter=rec_rects.begin(); iter != rec_rects.end(); ++iter) {
 509                                 RecBoxInfo &rect = (*iter);
 510                                 delete rect.rectangle;
 511                         }
 512
 513                         rec_rects.clear();
 514
 515                 }
 516         }
 517 }
 518
 519 void
 520 MidiStreamView::update_rec_regions (boost::shared_ptr<MidiModel> data, nframes_t start, nframes_t dur)
 521 {
 522         ENSURE_GUI_THREAD (*this, &MidiStreamView::update_rec_regions, data, start, dur)
 523
 524         if (Config->get_show_waveforms_while_recording ()) {
 525
 526                 uint32_t n = 0;
 527                 bool     update_range = false;
 528
 529                 for (list<pair<boost::shared_ptr<Region>,RegionView*> >::iterator iter = rec_regions.begin();
 530                                 iter != rec_regions.end(); n++) {
 531
 532                         list<pair<boost::shared_ptr<Region>,RegionView*> >::iterator tmp = iter;
 533                         ++tmp;
 534
 535                         if (!canvas_item_visible (rec_rects[n].rectangle)) {
 536                                 /* rect already hidden, this region is done */
 537                                 iter = tmp;
 538                                 continue;
 539                         }
 540
 541                         boost::shared_ptr<MidiRegion> region = boost::dynamic_pointer_cast<MidiRegion>(iter->first);
 542                         if (!region) {
 543                                 iter = tmp;
 544                                 continue;
 545                         }
 546
 547                         nframes_t origlen = region->length();
 548
 549                         if (region == rec_regions.back().first && rec_active) {
 550
 551                                 if (start >= region->midi_source(0)->timeline_position()) {
 552
 553                                         nframes_t nlen = start + dur - region->position();
 554
 555                                         if (nlen != region->length()) {
 556
 557                                                 region->suspend_property_changes ();
 558                                                 region->set_position (_trackview.track()->get_capture_start_frame(n), this);
 559                                                 region->set_length (start + dur - region->position(), this);
 560                                                 region->resume_property_changes ();
 561
 562                                                 if (origlen == 1) {
 563                                                         /* our special initial length */
 564                                                         iter->second = add_region_view_internal (region, false);
 565                                                         ((MidiRegionView*)iter->second)->begin_write();
 566                                                 }
 567
 568                                                 /* also update rect */
 569                                                 ArdourCanvas::SimpleRect * rect = rec_rects[n].rectangle;
 570                                                 gdouble xend = _trackview.editor().frame_to_pixel (region->position() + region->length());
 571                                                 rect->property_x2() = xend;
 572
 573                                                 ARDOUR::BeatsFramesConverter tconv(_trackview.session()->tempo_map(), region->position());
 574                                                 const MidiModel::TimeType start_beats = tconv.from(start);
 575
 576                                                 /* draw events */
 577                                                 MidiRegionView* mrv = (MidiRegionView*)iter->second;
 578
 579                                                 for (MidiModel::Notes::const_iterator i = data->note_lower_bound(start_beats);
 580                                                                 i != data->notes().end(); ++i) {
 581
 582                                                         const boost::shared_ptr<MidiRegionView::NoteType>& note = *i;
 583
 584                                                         nframes_t note_start_frames = tconv.to(note->time());
 585                                                         nframes_t note_end_frames   = tconv.to(note->end_time());
 586
 587                                                         if (note->length() > 0 && note_end_frames + region->position() > start)
 588                                                                 mrv->resolve_note(note->note(), note_end_frames);
 589
 590                                                         if (note_start_frames + region->position() < start) {
 591                                                                 continue;
 592                                                         }
 593
 594                                                         if (note_start_frames + region->position() > start + dur) {
 595                                                                 break;
 596                                                         }
 597
 598                                                         if (note->note() < _lowest_note) {
 599                                                                 _lowest_note = note->note();
 600                                                                 update_range = true;
 601                                                         } else if (note->note() > _highest_note) {
 602                                                                 _highest_note = note->note();
 603                                                                 update_range = true;
 604                                                         }
 605
 606                                                         mrv->add_note (note, !update_range);
 607                                                 }
 608
 609                                                 mrv->extend_active_notes();
 610                                         }
 611                                 }
 612
 613                         } else {
 614
 615                                 nframes_t nlen = _trackview.track()->get_captured_frames(n);
 616
 617                                 if (nlen != region->length()) {
 618
 619                                         if (region->source_length(0) >= region->position() + nlen) {
 620
 621                                                 region->suspend_property_changes ();
 622                                                 region->set_position (_trackview.track()->get_capture_start_frame(n), this);
 623                                                 region->set_length (nlen, this);
 624                                                 region->resume_property_changes ();
 625
 626                                                 if (origlen == 1) {
 627                                                         /* our special initial length */
 628                                                         iter->second = add_region_view_internal (region, false);
 629                                                 }
 630
 631                                                 /* also hide rect */
 632                                                 ArdourCanvas::Item * rect = rec_rects[n].rectangle;
 633                                                 rect->hide();
 634
 635                                         }
 636                                 }
 637                         }
 638
 639                         iter = tmp;
 640                 }
 641
 642                 if (update_range)
 643                         update_contents_height();
 644         }
 645 }
 646
 647 void
 648 MidiStreamView::rec_data_range_ready (nframes_t start, nframes_t cnt, boost::weak_ptr<Source> weak_src)
 649 {
 650         // this is called from the butler thread for now
 651
 652         ENSURE_GUI_THREAD (*this, &MidiStreamView::rec_data_range_ready, start, cnt, weak_src)
 653
 654         boost::shared_ptr<SMFSource> src (boost::dynamic_pointer_cast<SMFSource>(weak_src.lock()));
 655
 656         if (!src) {
 657                 return;
 658         }
 659
 660         if (start + cnt > last_rec_data_frame) {
 661                 last_rec_data_frame = start + cnt;
 662         }
 663
 664         this->update_rec_regions (src->model(), start, cnt);
 665 }
 666
 667 void
 668 MidiStreamView::color_handler ()
 669 {
 670         //case cMidiTrackBase:
 671         if (_trackview.is_midi_track()) {
 672                 //canvas_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MidiTrackBase.get();
 673         }
 674
 675         //case cMidiBusBase:
 676         if (!_trackview.is_midi_track()) {
 677                 //canvas_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MidiBusBase.get();;
 678         }
 679 }
 680
 681 void
 682 MidiStreamView::note_range_adjustment_changed()
 683 {
 684         double sum = note_range_adjustment.get_value() + note_range_adjustment.get_page_size();
 685         int lowest = (int) floor(note_range_adjustment.get_value());
 686         int highest;
 687
 688         if (sum == _range_sum_cache) {
 689                 //cerr << "cached" << endl;
 690                 highest = (int) floor(sum);
 691         } else {
 692                 //cerr << "recalc" << endl;
 693                 highest = lowest + (int) floor(note_range_adjustment.get_page_size());
 694                 _range_sum_cache = sum;
 695         }
 696
 697         if (lowest == _lowest_note && highest == _highest_note) {
 698                 return;
 699         }
 700
 701         //cerr << "note range adjustment changed: " << lowest << " " << highest << endl;
 702         //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;
 703
 704         _lowest_note = lowest;
 705         _highest_note = highest;
 706         apply_note_range(lowest, highest, true);
 707 }
 708