pv/views/trace/view.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifdef ENABLE_DECODE
  21 #include <libsigrokdecode/libsigrokdecode.h>
  22 #endif
  23
  24 #include <extdef.h>
  25
  26 #include <algorithm>
  27 #include <cassert>
  28 #include <climits>
  29 #include <cmath>
  30 #include <iostream>
  31 #include <iterator>
  32 #include <unordered_set>
  33
  34 #include <boost/archive/text_iarchive.hpp>
  35 #include <boost/archive/text_oarchive.hpp>
  36 #include <boost/serialization/serialization.hpp>
  37
  38 #include <QApplication>
  39 #include <QEvent>
  40 #include <QFontMetrics>
  41 #include <QMouseEvent>
  42 #include <QScrollBar>
  43 #include <QVBoxLayout>
  44
  45 #include <libsigrokcxx/libsigrokcxx.hpp>
  46
  47 #include "analogsignal.hpp"
  48 #include "header.hpp"
  49 #include "logicsignal.hpp"
  50 #include "ruler.hpp"
  51 #include "signal.hpp"
  52 #include "tracegroup.hpp"
  53 #include "triggermarker.hpp"
  54 #include "view.hpp"
  55 #include "viewport.hpp"
  56
  57 #include "pv/data/logic.hpp"
  58 #include "pv/data/logicsegment.hpp"
  59 #include "pv/devices/device.hpp"
  60 #include "pv/globalsettings.hpp"
  61 #include "pv/session.hpp"
  62 #include "pv/util.hpp"
  63
  64 #ifdef ENABLE_DECODE
  65 #include "decodetrace.hpp"
  66 #endif
  67
  68 using pv::data::SignalData;
  69 using pv::data::Segment;
  70 using pv::util::TimeUnit;
  71 using pv::util::Timestamp;
  72
  73 using std::back_inserter;
  74 using std::copy_if;
  75 using std::count_if;
  76 using std::inserter;
  77 using std::max;
  78 using std::make_pair;
  79 using std::make_shared;
  80 using std::min;
  81 using std::pair;
  82 using std::set;
  83 using std::set_difference;
  84 using std::shared_ptr;
  85 using std::stringstream;
  86 using std::unordered_map;
  87 using std::unordered_set;
  88 using std::vector;
  89
  90 namespace pv {
  91 namespace views {
  92 namespace trace {
  93
  94 const Timestamp View::MaxScale("1e9");
  95 const Timestamp View::MinScale("1e-12");
  96
  97 const int View::MaxScrollValue = INT_MAX / 2;
  98
  99 const int View::ScaleUnits[3] = {1, 2, 5};
 100
 101
 102 CustomScrollArea::CustomScrollArea(QWidget *parent) :
 103         QAbstractScrollArea(parent)
 104 {
 105 }
 106
 107 bool CustomScrollArea::viewportEvent(QEvent *event)
 108 {
 109         switch (event->type()) {
 110         case QEvent::Paint:
 111         case QEvent::MouseButtonPress:
 112         case QEvent::MouseButtonRelease:
 113         case QEvent::MouseButtonDblClick:
 114         case QEvent::MouseMove:
 115         case QEvent::Wheel:
 116         case QEvent::TouchBegin:
 117         case QEvent::TouchUpdate:
 118         case QEvent::TouchEnd:
 119                 return false;
 120         default:
 121                 return QAbstractScrollArea::viewportEvent(event);
 122         }
 123 }
 124
 125 View::View(Session &session, bool is_main_view, QWidget *parent) :
 126         ViewBase(session, is_main_view, parent),
 127
 128         // Note: Place defaults in View::reset_view_state(), not here
 129         splitter_(new QSplitter()),
 130         header_was_shrunk_(false),  // The splitter remains unchanged after a reset, so this goes here
 131         sticky_scrolling_(false)  // Default setting is set in MainWindow::setup_ui()
 132 {
 133         QVBoxLayout *root_layout = new QVBoxLayout(this);
 134         root_layout->setContentsMargins(0, 0, 0, 0);
 135         root_layout->addWidget(splitter_);
 136
 137         viewport_ = new Viewport(*this);
 138         scrollarea_ = new CustomScrollArea(splitter_);
 139         scrollarea_->setViewport(viewport_);
 140         scrollarea_->setFrameShape(QFrame::NoFrame);
 141
 142         ruler_ = new Ruler(*this);
 143
 144         header_ = new Header(*this);
 145         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 146
 147         // We put the header into a simple layout so that we can add the top margin,
 148         // allowing us to make it line up with the bottom of the ruler
 149         QWidget *header_container = new QWidget();
 150         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 151         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 152         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 153         header_layout->addWidget(header_);
 154
 155         // To let the ruler and scrollarea be on the same split pane, we need a layout
 156         QWidget *trace_container = new QWidget();
 157         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 158         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 159         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 160         trace_layout->setContentsMargins(0, 0, 0, 0);
 161         trace_layout->addWidget(ruler_);
 162         trace_layout->addWidget(scrollarea_);
 163
 164         splitter_->addWidget(header_container);
 165         splitter_->addWidget(trace_container);
 166         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 167         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 168         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 169         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 170         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 171         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 172
 173         viewport_->installEventFilter(this);
 174         ruler_->installEventFilter(this);
 175         header_->installEventFilter(this);
 176
 177         // Set up settings and event handlers
 178         GlobalSettings settings;
 179         colored_bg_ = settings.value(GlobalSettings::Key_View_ColoredBG).toBool();
 180
 181         GlobalSettings::add_change_handler(this);
 182
 183         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 184                 this, SLOT(h_scroll_value_changed(int)));
 185         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 186                 this, SLOT(v_scroll_value_changed()));
 187
 188         connect(header_, SIGNAL(selection_changed()),
 189                 ruler_, SLOT(clear_selection()));
 190         connect(ruler_, SIGNAL(selection_changed()),
 191                 header_, SLOT(clear_selection()));
 192
 193         connect(header_, SIGNAL(selection_changed()),
 194                 this, SIGNAL(selection_changed()));
 195         connect(ruler_, SIGNAL(selection_changed()),
 196                 this, SIGNAL(selection_changed()));
 197
 198         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 199                 this, SLOT(on_splitter_moved()));
 200
 201         connect(&lazy_event_handler_, SIGNAL(timeout()),
 202                 this, SLOT(process_sticky_events()));
 203         lazy_event_handler_.setSingleShot(true);
 204
 205         // Trigger the initial event manually. The default device has signals
 206         // which were created before this object came into being
 207         signals_changed();
 208
 209         // make sure the transparent widgets are on the top
 210         ruler_->raise();
 211         header_->raise();
 212
 213         reset_view_state();
 214 }
 215
 216 View::~View()
 217 {
 218         GlobalSettings::remove_change_handler(this);
 219 }
 220
 221 void View::reset_view_state()
 222 {
 223         ViewBase::reset_view_state();
 224
 225         segment_display_mode_ = Trace::ShowLastSegmentOnly;
 226         segment_selectable_ = false;
 227         scale_ = 1e-3;
 228         offset_ = 0;
 229         ruler_offset_ = 0;
 230         updating_scroll_ = false;
 231         settings_restored_ = false;
 232         always_zoom_to_fit_ = false;
 233         tick_period_ = 0;
 234         tick_prefix_ = pv::util::SIPrefix::yocto;
 235         tick_precision_ = 0;
 236         time_unit_ = util::TimeUnit::Time;
 237         show_cursors_ = false;
 238         cursors_ = make_shared<CursorPair>(*this);
 239         next_flag_text_ = 'A';
 240         trigger_markers_.clear();
 241         hover_point_ = QPoint(-1, -1);
 242         scroll_needs_defaults_ = true;
 243         saved_v_offset_ = 0;
 244         scale_at_acq_start_ = 0;
 245         offset_at_acq_start_ = 0;
 246         suppress_zoom_to_fit_after_acq_ = false;
 247
 248         show_cursors_ = false;
 249         cursors_.reset();
 250         flags_.clear();
 251
 252         // Update the zoom state
 253         calculate_tick_spacing();
 254
 255         // Make sure the standard bar's segment selector is in sync
 256         set_segment_display_mode(segment_display_mode_);
 257 }
 258
 259 Session& View::session()
 260 {
 261         return session_;
 262 }
 263
 264 const Session& View::session() const
 265 {
 266         return session_;
 267 }
 268
 269 unordered_set< shared_ptr<Signal> > View::signals() const
 270 {
 271         return signals_;
 272 }
 273
 274 void View::clear_signals()
 275 {
 276         ViewBase::clear_signalbases();
 277         signals_.clear();
 278 }
 279
 280 void View::add_signal(const shared_ptr<Signal> signal)
 281 {
 282         ViewBase::add_signalbase(signal->base());
 283         signals_.insert(signal);
 284
 285         signal->set_segment_display_mode(segment_display_mode_);
 286         signal->set_current_segment(current_segment_);
 287
 288         connect(signal->base().get(), SIGNAL(name_changed(const QString&)),
 289                 this, SLOT(on_signal_name_changed()));
 290 }
 291
 292 #ifdef ENABLE_DECODE
 293 void View::clear_decode_signals()
 294 {
 295         decode_traces_.clear();
 296 }
 297
 298 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 299 {
 300         shared_ptr<DecodeTrace> d(
 301                 new DecodeTrace(session_, signal, decode_traces_.size()));
 302         decode_traces_.push_back(d);
 303
 304         d->set_segment_display_mode(segment_display_mode_);
 305         d->set_current_segment(current_segment_);
 306
 307         connect(signal.get(), SIGNAL(name_changed(const QString&)),
 308                 this, SLOT(on_signal_name_changed()));
 309 }
 310
 311 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 312 {
 313         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 314                 if ((*i)->base() == signal) {
 315                         decode_traces_.erase(i);
 316                         signals_changed();
 317                         return;
 318                 }
 319 }
 320 #endif
 321
 322 View* View::view()
 323 {
 324         return this;
 325 }
 326
 327 const View* View::view() const
 328 {
 329         return this;
 330 }
 331
 332 Viewport* View::viewport()
 333 {
 334         return viewport_;
 335 }
 336
 337 const Viewport* View::viewport() const
 338 {
 339         return viewport_;
 340 }
 341
 342 void View::save_settings(QSettings &settings) const
 343 {
 344         settings.setValue("scale", scale_);
 345         settings.setValue("v_offset",
 346                 scrollarea_->verticalScrollBar()->sliderPosition());
 347
 348         settings.setValue("splitter_state", splitter_->saveState());
 349         settings.setValue("segment_display_mode", segment_display_mode_);
 350
 351         {
 352                 stringstream ss;
 353                 boost::archive::text_oarchive oa(ss);
 354                 oa << boost::serialization::make_nvp("ruler_shift", ruler_shift_);
 355                 settings.setValue("ruler_shift", QString::fromStdString(ss.str()));
 356         }
 357         {
 358                 stringstream ss;
 359                 boost::archive::text_oarchive oa(ss);
 360                 oa << boost::serialization::make_nvp("offset", offset_);
 361                 settings.setValue("offset", QString::fromStdString(ss.str()));
 362         }
 363
 364         for (shared_ptr<Signal> signal : signals_) {
 365                 settings.beginGroup(signal->base()->internal_name());
 366                 signal->save_settings(settings);
 367                 settings.endGroup();
 368         }
 369 }
 370
 371 void View::restore_settings(QSettings &settings)
 372 {
 373         // Note: It is assumed that this function is only called once,
 374         // immediately after restoring a previous session.
 375
 376         if (settings.contains("scale"))
 377                 set_scale(settings.value("scale").toDouble());
 378
 379         if (settings.contains("ruler_shift")) {
 380                 util::Timestamp shift;
 381                 stringstream ss;
 382                 ss << settings.value("ruler_shift").toString().toStdString();
 383
 384                 try {
 385                         boost::archive::text_iarchive ia(ss);
 386                         ia >> boost::serialization::make_nvp("ruler_shift", shift);
 387                         ruler_shift_ = shift;
 388                 } catch (boost::archive::archive_exception) {
 389                         qDebug() << "Could not restore the view ruler shift";
 390                 }
 391         }
 392
 393         if (settings.contains("offset")) {
 394                 util::Timestamp offset;
 395                 stringstream ss;
 396                 ss << settings.value("offset").toString().toStdString();
 397
 398                 try {
 399                         boost::archive::text_iarchive ia(ss);
 400                         ia >> boost::serialization::make_nvp("offset", offset);
 401                         // This also updates ruler_offset_
 402                         set_offset(offset);
 403                 } catch (boost::archive::archive_exception) {
 404                         qDebug() << "Could not restore the view offset";
 405                 }
 406         }
 407
 408         if (settings.contains("splitter_state"))
 409                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 410
 411         if (settings.contains("segment_display_mode"))
 412                 set_segment_display_mode(
 413                         (Trace::SegmentDisplayMode)(settings.value("segment_display_mode").toInt()));
 414
 415         for (shared_ptr<Signal> signal : signals_) {
 416                 settings.beginGroup(signal->base()->internal_name());
 417                 signal->restore_settings(settings);
 418                 settings.endGroup();
 419         }
 420
 421         if (settings.contains("v_offset")) {
 422                 saved_v_offset_ = settings.value("v_offset").toInt();
 423                 set_v_offset(saved_v_offset_);
 424                 scroll_needs_defaults_ = false;
 425                 // Note: see eventFilter() for additional information
 426         }
 427
 428         settings_restored_ = true;
 429         suppress_zoom_to_fit_after_acq_ = true;
 430
 431         // Update the ruler so that it uses the new scale
 432         calculate_tick_spacing();
 433 }
 434
 435 vector< shared_ptr<TimeItem> > View::time_items() const
 436 {
 437         const vector<shared_ptr<Flag>> f(flags());
 438         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 439
 440         if (cursors_) {
 441                 items.push_back(cursors_);
 442                 items.push_back(cursors_->first());
 443                 items.push_back(cursors_->second());
 444         }
 445
 446         for (auto trigger_marker : trigger_markers_)
 447                 items.push_back(trigger_marker);
 448
 449         return items;
 450 }
 451
 452 double View::scale() const
 453 {
 454         return scale_;
 455 }
 456
 457 void View::set_scale(double scale)
 458 {
 459         if (scale_ != scale) {
 460                 scale_ = scale;
 461                 scale_changed();
 462         }
 463 }
 464
 465 void View::set_offset(const pv::util::Timestamp& offset, bool force_update)
 466 {
 467         if ((offset_ != offset) || force_update) {
 468                 offset_ = offset;
 469                 ruler_offset_ = offset_ + ruler_shift_;
 470                 offset_changed();
 471         }
 472 }
 473
 474 const Timestamp& View::offset() const
 475 {
 476         return offset_;
 477 }
 478
 479 const Timestamp& View::ruler_offset() const
 480 {
 481         return ruler_offset_;
 482 }
 483
 484 void View::set_zero_position(pv::util::Timestamp& position)
 485 {
 486         ruler_shift_ = -position;
 487
 488         // Force an immediate update of the offsets
 489         set_offset(offset_, true);
 490         ruler_->update();
 491 }
 492
 493 void View::reset_zero_position()
 494 {
 495         ruler_shift_ = 0;
 496
 497         // Force an immediate update of the offsets
 498         set_offset(offset_, true);
 499         ruler_->update();
 500 }
 501
 502 int View::owner_visual_v_offset() const
 503 {
 504         return -scrollarea_->verticalScrollBar()->sliderPosition();
 505 }
 506
 507 void View::set_v_offset(int offset)
 508 {
 509         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 510         header_->update();
 511         viewport_->update();
 512 }
 513
 514 unsigned int View::depth() const
 515 {
 516         return 0;
 517 }
 518
 519 uint32_t View::current_segment() const
 520 {
 521         return current_segment_;
 522 }
 523
 524 pv::util::SIPrefix View::tick_prefix() const
 525 {
 526         return tick_prefix_;
 527 }
 528
 529 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 530 {
 531         if (tick_prefix_ != tick_prefix) {
 532                 tick_prefix_ = tick_prefix;
 533                 tick_prefix_changed();
 534         }
 535 }
 536
 537 unsigned int View::tick_precision() const
 538 {
 539         return tick_precision_;
 540 }
 541
 542 void View::set_tick_precision(unsigned tick_precision)
 543 {
 544         if (tick_precision_ != tick_precision) {
 545                 tick_precision_ = tick_precision;
 546                 tick_precision_changed();
 547         }
 548 }
 549
 550 const pv::util::Timestamp& View::tick_period() const
 551 {
 552         return tick_period_;
 553 }
 554
 555 unsigned int View::minor_tick_count() const
 556 {
 557         return minor_tick_count_;
 558 }
 559
 560 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 561 {
 562         if (tick_period_ != tick_period) {
 563                 tick_period_ = tick_period;
 564                 tick_period_changed();
 565         }
 566 }
 567
 568 TimeUnit View::time_unit() const
 569 {
 570         return time_unit_;
 571 }
 572
 573 void View::set_time_unit(pv::util::TimeUnit time_unit)
 574 {
 575         if (time_unit_ != time_unit) {
 576                 time_unit_ = time_unit;
 577                 time_unit_changed();
 578         }
 579 }
 580
 581 void View::set_current_segment(uint32_t segment_id)
 582 {
 583         current_segment_ = segment_id;
 584
 585         for (shared_ptr<Signal> signal : signals_)
 586                 signal->set_current_segment(current_segment_);
 587 #ifdef ENABLE_DECODE
 588         for (shared_ptr<DecodeTrace> dt : decode_traces_)
 589                 dt->set_current_segment(current_segment_);
 590 #endif
 591
 592         vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
 593
 594         trigger_markers_.clear();
 595         for (util::Timestamp timestamp : triggers)
 596                 trigger_markers_.push_back(make_shared<TriggerMarker>(*this, timestamp));
 597
 598         // When enabled, the first trigger for this segment is used as the zero position
 599         GlobalSettings settings;
 600         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 601
 602         if (trigger_is_zero_time && (triggers.size() > 0))
 603                 set_zero_position(triggers.front());
 604
 605         viewport_->update();
 606
 607         segment_changed(segment_id);
 608 }
 609
 610 bool View::segment_is_selectable() const
 611 {
 612         return segment_selectable_;
 613 }
 614
 615 Trace::SegmentDisplayMode View::segment_display_mode() const
 616 {
 617         return segment_display_mode_;
 618 }
 619
 620 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 621 {
 622         trigger_markers_.clear();
 623
 624         segment_display_mode_ = mode;
 625
 626         for (shared_ptr<Signal> signal : signals_)
 627                 signal->set_segment_display_mode(mode);
 628
 629         uint32_t last_segment = session_.get_segment_count() - 1;
 630
 631         switch (mode) {
 632         case Trace::ShowLastSegmentOnly:
 633                 if (current_segment_ != last_segment)
 634                         set_current_segment(last_segment);
 635                 break;
 636
 637         case Trace::ShowLastCompleteSegmentOnly:
 638                 // Do nothing if we only have one segment so far
 639                 if (last_segment > 0) {
 640                         // If the last segment isn't complete, the previous one must be
 641                         uint32_t segment_id =
 642                                 (session_.all_segments_complete(last_segment)) ?
 643                                 last_segment : last_segment - 1;
 644
 645                         if (current_segment_ != segment_id)
 646                                 set_current_segment(segment_id);
 647                 }
 648                 break;
 649
 650         case Trace::ShowSingleSegmentOnly:
 651         case Trace::ShowAllSegments:
 652         case Trace::ShowAccumulatedIntensity:
 653         default:
 654                 // Current segment remains as-is
 655                 break;
 656         }
 657
 658         segment_selectable_ = true;
 659
 660         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 661                 segment_selectable_ = false;
 662
 663         viewport_->update();
 664
 665         segment_display_mode_changed((int)mode, segment_selectable_);
 666 }
 667
 668 void View::zoom(double steps)
 669 {
 670         zoom(steps, viewport_->width() / 2);
 671 }
 672
 673 void View::zoom(double steps, int offset)
 674 {
 675         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 676 }
 677
 678 void View::zoom_fit(bool gui_state)
 679 {
 680         // Act as one-shot when stopped, toggle along with the GUI otherwise
 681         if (session_.get_capture_state() == Session::Stopped) {
 682                 always_zoom_to_fit_ = false;
 683                 always_zoom_to_fit_changed(false);
 684         } else {
 685                 always_zoom_to_fit_ = gui_state;
 686                 always_zoom_to_fit_changed(gui_state);
 687         }
 688
 689         const pair<Timestamp, Timestamp> extents = get_time_extents();
 690         const Timestamp delta = extents.second - extents.first;
 691         if (delta < Timestamp("1e-12"))
 692                 return;
 693
 694         assert(viewport_);
 695         const int w = viewport_->width();
 696         if (w <= 0)
 697                 return;
 698
 699         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 700         set_scale_offset(scale.convert_to<double>(), extents.first);
 701 }
 702
 703 void View::zoom_one_to_one()
 704 {
 705         using pv::data::SignalData;
 706
 707         // Make a set of all the visible data objects
 708         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 709         if (visible_data.empty())
 710                 return;
 711
 712         assert(viewport_);
 713         const int w = viewport_->width();
 714         if (w <= 0)
 715                 return;
 716
 717         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 718 }
 719
 720 void View::set_scale_offset(double scale, const Timestamp& offset)
 721 {
 722         // Disable sticky scrolling / always zoom to fit when acquisition runs
 723         // and user drags the viewport
 724         if ((scale_ == scale) && (offset_ != offset) &&
 725                         (session_.get_capture_state() == Session::Running)) {
 726
 727                 if (sticky_scrolling_) {
 728                         sticky_scrolling_ = false;
 729                         sticky_scrolling_changed(false);
 730                 }
 731
 732                 if (always_zoom_to_fit_) {
 733                         always_zoom_to_fit_ = false;
 734                         always_zoom_to_fit_changed(false);
 735                 }
 736         }
 737
 738         set_scale(scale);
 739         set_offset(offset);
 740
 741         calculate_tick_spacing();
 742
 743         update_scroll();
 744         ruler_->update();
 745         viewport_->update();
 746 }
 747
 748 set< shared_ptr<SignalData> > View::get_visible_data() const
 749 {
 750         // Make a set of all the visible data objects
 751         set< shared_ptr<SignalData> > visible_data;
 752         for (const shared_ptr<Signal> sig : signals_)
 753                 if (sig->enabled())
 754                         visible_data.insert(sig->data());
 755
 756         return visible_data;
 757 }
 758
 759 pair<Timestamp, Timestamp> View::get_time_extents() const
 760 {
 761         boost::optional<Timestamp> left_time, right_time;
 762         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 763         for (const shared_ptr<SignalData> d : visible_data) {
 764                 const vector< shared_ptr<Segment> > segments = d->segments();
 765                 for (const shared_ptr<Segment> &s : segments) {
 766                         double samplerate = s->samplerate();
 767                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 768
 769                         const Timestamp start_time = s->start_time();
 770                         left_time = left_time ?
 771                                 min(*left_time, start_time) :
 772                                                 start_time;
 773                         right_time = right_time ?
 774                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 775                                                  start_time + d->max_sample_count() / samplerate;
 776                 }
 777         }
 778
 779         if (!left_time || !right_time)
 780                 return make_pair(0, 0);
 781
 782         assert(*left_time < *right_time);
 783         return make_pair(*left_time, *right_time);
 784 }
 785
 786 void View::enable_show_sampling_points(bool state)
 787 {
 788         (void)state;
 789
 790         viewport_->update();
 791 }
 792
 793 void View::enable_show_analog_minor_grid(bool state)
 794 {
 795         (void)state;
 796
 797         viewport_->update();
 798 }
 799
 800 void View::enable_colored_bg(bool state)
 801 {
 802         colored_bg_ = state;
 803         viewport_->update();
 804 }
 805
 806 bool View::colored_bg() const
 807 {
 808         return colored_bg_;
 809 }
 810
 811 bool View::cursors_shown() const
 812 {
 813         return show_cursors_;
 814 }
 815
 816 void View::show_cursors(bool show)
 817 {
 818         show_cursors_ = show;
 819         ruler_->update();
 820         viewport_->update();
 821 }
 822
 823 void View::centre_cursors()
 824 {
 825         if (cursors_) {
 826                 const double time_width = scale_ * viewport_->width();
 827                 cursors_->first()->set_time(offset_ + time_width * 0.4);
 828                 cursors_->second()->set_time(offset_ + time_width * 0.6);
 829
 830                 ruler_->update();
 831                 viewport_->update();
 832         }
 833 }
 834
 835 shared_ptr<CursorPair> View::cursors() const
 836 {
 837         return cursors_;
 838 }
 839
 840 void View::add_flag(const Timestamp& time)
 841 {
 842         flags_.push_back(make_shared<Flag>(*this, time,
 843                 QString("%1").arg(next_flag_text_)));
 844
 845         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 846                 (next_flag_text_ + 1);
 847
 848         time_item_appearance_changed(true, true);
 849 }
 850
 851 void View::remove_flag(shared_ptr<Flag> flag)
 852 {
 853         flags_.remove(flag);
 854         time_item_appearance_changed(true, true);
 855 }
 856
 857 vector< shared_ptr<Flag> > View::flags() const
 858 {
 859         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 860         stable_sort(flags.begin(), flags.end(),
 861                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 862                         return a->time() < b->time();
 863                 });
 864
 865         return flags;
 866 }
 867
 868 const QPoint& View::hover_point() const
 869 {
 870         return hover_point_;
 871 }
 872
 873 void View::restack_all_trace_tree_items()
 874 {
 875         // Make a list of owners that is sorted from deepest first
 876         const vector<shared_ptr<TraceTreeItem>> items(
 877                 list_by_type<TraceTreeItem>());
 878         set< TraceTreeItemOwner* > owners;
 879         for (const auto &r : items)
 880                 owners.insert(r->owner());
 881         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 882         sort(sorted_owners.begin(), sorted_owners.end(),
 883                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 884                         return a->depth() > b->depth(); });
 885
 886         // Restack the items recursively
 887         for (auto &o : sorted_owners)
 888                 o->restack_items();
 889
 890         // Animate the items to their destination
 891         for (const auto &i : items)
 892                 i->animate_to_layout_v_offset();
 893 }
 894
 895 void View::on_setting_changed(const QString &key, const QVariant &value)
 896 {
 897         if (key == GlobalSettings::Key_View_TriggerIsZeroTime)
 898                 on_settingViewTriggerIsZeroTime_changed(value);
 899 }
 900
 901 void View::trigger_event(int segment_id, util::Timestamp location)
 902 {
 903         // TODO This doesn't work if we're showing multiple segments at once
 904         if ((uint32_t)segment_id != current_segment_)
 905                 return;
 906
 907         // Set zero location if the Key_View_TriggerIsZeroTime setting is set and
 908         // if this is the first trigger for this segment.
 909         GlobalSettings settings;
 910         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 911
 912         size_t trigger_count = session_.get_triggers(current_segment_).size();
 913
 914         if (trigger_is_zero_time && trigger_count == 1)
 915                 set_zero_position(location);
 916
 917         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 918 }
 919
 920 void View::get_scroll_layout(double &length, Timestamp &offset) const
 921 {
 922         const pair<Timestamp, Timestamp> extents = get_time_extents();
 923         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 924         offset = offset_ / scale_;
 925 }
 926
 927 void View::set_zoom(double scale, int offset)
 928 {
 929         // Reset the "always zoom to fit" feature as the user changed the zoom
 930         always_zoom_to_fit_ = false;
 931         always_zoom_to_fit_changed(false);
 932
 933         const Timestamp cursor_offset = offset_ + scale_ * offset;
 934         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 935         const Timestamp new_offset = cursor_offset - new_scale * offset;
 936         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 937 }
 938
 939 void View::calculate_tick_spacing()
 940 {
 941         const double SpacingIncrement = 10.0f;
 942         const double MinValueSpacing = 40.0f;
 943
 944         // Figure out the highest numeric value visible on a label
 945         const QSize areaSize = viewport_->size();
 946         const Timestamp max_time = max(fabs(offset_),
 947                 fabs(offset_ + scale_ * areaSize.width()));
 948
 949         double min_width = SpacingIncrement;
 950         double label_width, tick_period_width;
 951
 952         QFontMetrics m(QApplication::font());
 953
 954         // Copies of the member variables with the same name, used in the calculation
 955         // and written back afterwards, so that we don't emit signals all the time
 956         // during the calculation.
 957         pv::util::Timestamp tick_period = tick_period_;
 958         pv::util::SIPrefix tick_prefix = tick_prefix_;
 959         unsigned tick_precision = tick_precision_;
 960
 961         do {
 962                 const double min_period = scale_ * min_width;
 963
 964                 const int order = (int)floorf(log10f(min_period));
 965                 const pv::util::Timestamp order_decimal =
 966                         pow(pv::util::Timestamp(10), order);
 967
 968                 // Allow for a margin of error so that a scale unit of 1 can be used.
 969                 // Otherwise, for a SU of 1 the tick period will almost always be below
 970                 // the min_period by a small amount - and thus skipped in favor of 2.
 971                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 972                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 973                 double tp_with_margin;
 974                 unsigned int unit = 0;
 975
 976                 do {
 977                         tp_with_margin = order_decimal.convert_to<double>() *
 978                                 (ScaleUnits[unit++] + tp_margin);
 979                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 980
 981                 minor_tick_count_ = (unit == 2) ? 4 : 5;
 982                 tick_period = order_decimal * ScaleUnits[unit - 1];
 983                 tick_prefix = static_cast<pv::util::SIPrefix>(
 984                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 985
 986                 // Precision is the number of fractional digits required, not
 987                 // taking the prefix into account (and it must never be negative)
 988                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 989
 990                 tick_period_width = (tick_period / scale_).convert_to<double>();
 991
 992                 const QString label_text = Ruler::format_time_with_distance(
 993                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 994
 995                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 996                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 997                                 MinValueSpacing;
 998
 999                 min_width += SpacingIncrement;
1000         } while (tick_period_width < label_width);
1001
1002         set_tick_period(tick_period);
1003         set_tick_prefix(tick_prefix);
1004         set_tick_precision(tick_precision);
1005 }
1006
1007 void View::adjust_top_margin()
1008 {
1009         assert(viewport_);
1010
1011         const QSize areaSize = viewport_->size();
1012
1013         const pair<int, int> extents = v_extents();
1014         const int top_margin = owner_visual_v_offset() + extents.first;
1015         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
1016
1017         // Do we have empty space at the top while the last trace goes out of screen?
1018         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
1019                 const int trace_height = extents.second - extents.first;
1020
1021                 // Center everything vertically if there is enough space
1022                 if (areaSize.height() >= trace_height)
1023                         set_v_offset(extents.first -
1024                                 ((areaSize.height() - trace_height) / 2));
1025                 else
1026                         // Remove the top margin to make as many traces fit on screen as possible
1027                         set_v_offset(extents.first);
1028         }
1029 }
1030
1031 void View::update_scroll()
1032 {
1033         assert(viewport_);
1034         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
1035         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
1036
1037         const QSize areaSize = viewport_->size();
1038
1039         // Set the horizontal scroll bar
1040         double length = 0;
1041         Timestamp offset;
1042         get_scroll_layout(length, offset);
1043         length = max(length - areaSize.width(), 0.0);
1044
1045         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
1046
1047         hscrollbar->setPageStep(areaSize.width() / 2);
1048         hscrollbar->setSingleStep(major_tick_distance);
1049
1050         updating_scroll_ = true;
1051
1052         if (length < MaxScrollValue) {
1053                 hscrollbar->setRange(0, length);
1054                 hscrollbar->setSliderPosition(offset.convert_to<double>());
1055         } else {
1056                 hscrollbar->setRange(0, MaxScrollValue);
1057                 hscrollbar->setSliderPosition(
1058                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
1059         }
1060
1061         updating_scroll_ = false;
1062
1063         // Set the vertical scrollbar
1064         vscrollbar->setPageStep(areaSize.height());
1065         vscrollbar->setSingleStep(areaSize.height() / 8);
1066
1067         const pair<int, int> extents = v_extents();
1068
1069         // Don't change the scrollbar range if there are no traces
1070         if (extents.first != extents.second)
1071                 vscrollbar->setRange(extents.first - areaSize.height(),
1072                         extents.second);
1073
1074         if (scroll_needs_defaults_)
1075                 set_scroll_default();
1076 }
1077
1078 void View::reset_scroll()
1079 {
1080         scrollarea_->verticalScrollBar()->setRange(0, 0);
1081 }
1082
1083 void View::set_scroll_default()
1084 {
1085         assert(viewport_);
1086
1087         const QSize areaSize = viewport_->size();
1088
1089         const pair<int, int> extents = v_extents();
1090         const int trace_height = extents.second - extents.first;
1091
1092         // Do all traces fit in the view?
1093         if (areaSize.height() >= trace_height)
1094                 // Center all traces vertically
1095                 set_v_offset(extents.first -
1096                         ((areaSize.height() - trace_height) / 2));
1097         else
1098                 // Put the first trace at the top, letting the bottom ones overflow
1099                 set_v_offset(extents.first);
1100 }
1101
1102 void View::determine_if_header_was_shrunk()
1103 {
1104         const int header_pane_width = splitter_->sizes().front();
1105         const int header_width = header_->extended_size_hint().width();
1106
1107         // Allow for a slight margin of error so that we also accept
1108         // slight differences when e.g. a label name change increased
1109         // the overall width
1110         header_was_shrunk_ = (header_pane_width < (header_width - 10));
1111 }
1112
1113 void View::resize_header_to_fit()
1114 {
1115         // Setting the maximum width of the header widget doesn't work as
1116         // expected because the splitter would allow the user to make the
1117         // pane wider than that, creating empty space as a result.
1118         // To make this work, we stricly enforce the maximum width by
1119         // expanding the header unless the user shrunk it on purpose.
1120         // As we're then setting the width of the header pane, we set the
1121         // splitter to the maximum allowed position.
1122
1123         int splitter_area_width = 0;
1124         for (int w : splitter_->sizes())
1125                 splitter_area_width += w;
1126
1127         // Make sure the header has enough horizontal space to show all labels fully
1128         QList<int> pane_sizes;
1129         pane_sizes.push_back(header_->extended_size_hint().width());
1130         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1131         splitter_->setSizes(pane_sizes);
1132 }
1133
1134 void View::update_layout()
1135 {
1136         update_scroll();
1137 }
1138
1139 TraceTreeItemOwner* View::find_prevalent_trace_group(
1140         const shared_ptr<sigrok::ChannelGroup> &group,
1141         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1142                 &signal_map)
1143 {
1144         assert(group);
1145
1146         unordered_set<TraceTreeItemOwner*> owners;
1147         vector<TraceTreeItemOwner*> owner_list;
1148
1149         // Make a set and a list of all the owners
1150         for (const auto &channel : group->channels()) {
1151                 for (auto entry : signal_map) {
1152                         if (entry.first->channel() == channel) {
1153                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1154                                 owner_list.push_back(o);
1155                                 owners.insert(o);
1156                         }
1157                 }
1158         }
1159
1160         // Iterate through the list of owners, and find the most prevalent
1161         size_t max_prevalence = 0;
1162         TraceTreeItemOwner *prevalent_owner = nullptr;
1163         for (TraceTreeItemOwner *owner : owners) {
1164                 const size_t prevalence = count_if(
1165                         owner_list.begin(), owner_list.end(),
1166                         [&](TraceTreeItemOwner *o) { return o == owner; });
1167                 if (prevalence > max_prevalence) {
1168                         max_prevalence = prevalence;
1169                         prevalent_owner = owner;
1170                 }
1171         }
1172
1173         return prevalent_owner;
1174 }
1175
1176 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1177         const vector< shared_ptr<sigrok::Channel> > &channels,
1178         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1179                 &signal_map,
1180         set< shared_ptr<Trace> > &add_list)
1181 {
1182         vector< shared_ptr<Trace> > filtered_traces;
1183
1184         for (const auto &channel : channels) {
1185                 for (auto entry : signal_map) {
1186                         if (entry.first->channel() == channel) {
1187                                 shared_ptr<Trace> trace = entry.second;
1188                                 const auto list_iter = add_list.find(trace);
1189                                 if (list_iter == add_list.end())
1190                                         continue;
1191
1192                                 filtered_traces.push_back(trace);
1193                                 add_list.erase(list_iter);
1194                         }
1195                 }
1196         }
1197
1198         return filtered_traces;
1199 }
1200
1201 void View::determine_time_unit()
1202 {
1203         // Check whether we know the sample rate and hence can use time as the unit
1204         if (time_unit_ == util::TimeUnit::Samples) {
1205                 // Check all signals but...
1206                 for (const shared_ptr<Signal> signal : signals_) {
1207                         const shared_ptr<SignalData> data = signal->data();
1208
1209                         // ...only check first segment of each
1210                         const vector< shared_ptr<Segment> > segments = data->segments();
1211                         if (!segments.empty())
1212                                 if (segments[0]->samplerate()) {
1213                                         set_time_unit(util::TimeUnit::Time);
1214                                         break;
1215                                 }
1216                 }
1217         }
1218 }
1219
1220 bool View::eventFilter(QObject *object, QEvent *event)
1221 {
1222         const QEvent::Type type = event->type();
1223         if (type == QEvent::MouseMove) {
1224
1225                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1226                 if (object == viewport_)
1227                         hover_point_ = mouse_event->pos();
1228                 else if (object == ruler_)
1229                         hover_point_ = QPoint(mouse_event->x(), 0);
1230                 else if (object == header_)
1231                         hover_point_ = QPoint(0, mouse_event->y());
1232                 else
1233                         hover_point_ = QPoint(-1, -1);
1234
1235                 update_hover_point();
1236
1237         } else if (type == QEvent::Leave) {
1238                 hover_point_ = QPoint(-1, -1);
1239                 update_hover_point();
1240         } else if (type == QEvent::Show) {
1241
1242                 // This is somewhat of a hack, unfortunately. We cannot use
1243                 // set_v_offset() from within restore_settings() as the view
1244                 // at that point is neither visible nor properly sized.
1245                 // This is the least intrusive workaround I could come up
1246                 // with: set the vertical offset (or scroll defaults) when
1247                 // the view is shown, which happens after all widgets were
1248                 // resized to their final sizes.
1249                 update_layout();
1250
1251                 if (settings_restored_)
1252                         determine_if_header_was_shrunk();
1253                 else
1254                         resize_header_to_fit();
1255
1256                 if (scroll_needs_defaults_) {
1257                         set_scroll_default();
1258                         scroll_needs_defaults_ = false;
1259                 }
1260
1261                 if (saved_v_offset_) {
1262                         set_v_offset(saved_v_offset_);
1263                         saved_v_offset_ = 0;
1264                 }
1265         }
1266
1267         return QObject::eventFilter(object, event);
1268 }
1269
1270 void View::resizeEvent(QResizeEvent* event)
1271 {
1272         // Only adjust the top margin if we shrunk vertically
1273         if (event->size().height() < event->oldSize().height())
1274                 adjust_top_margin();
1275
1276         update_layout();
1277 }
1278
1279 void View::update_hover_point()
1280 {
1281         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1282                 list_by_type<TraceTreeItem>());
1283         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1284                 r->hover_point_changed(hover_point_);
1285
1286         hover_point_changed(hover_point_);
1287 }
1288
1289 void View::row_item_appearance_changed(bool label, bool content)
1290 {
1291         if (label)
1292                 header_->update();
1293         if (content)
1294                 viewport_->update();
1295 }
1296
1297 void View::time_item_appearance_changed(bool label, bool content)
1298 {
1299         if (label) {
1300                 ruler_->update();
1301
1302                 // Make sure the header pane width is updated, too
1303                 update_layout();
1304         }
1305
1306         if (content)
1307                 viewport_->update();
1308 }
1309
1310 void View::extents_changed(bool horz, bool vert)
1311 {
1312         sticky_events_ |=
1313                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1314                 (vert ? TraceTreeItemVExtentsChanged : 0);
1315
1316         lazy_event_handler_.start();
1317 }
1318
1319 void View::on_signal_name_changed()
1320 {
1321         if (!header_was_shrunk_)
1322                 resize_header_to_fit();
1323 }
1324
1325 void View::on_splitter_moved()
1326 {
1327         // The header can only shrink when the splitter is moved manually
1328         determine_if_header_was_shrunk();
1329
1330         if (!header_was_shrunk_)
1331                 resize_header_to_fit();
1332 }
1333
1334 void View::h_scroll_value_changed(int value)
1335 {
1336         if (updating_scroll_)
1337                 return;
1338
1339         // Disable sticky scrolling when user moves the horizontal scroll bar
1340         // during a running acquisition
1341         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1342                 sticky_scrolling_ = false;
1343                 sticky_scrolling_changed(false);
1344         }
1345
1346         const int range = scrollarea_->horizontalScrollBar()->maximum();
1347         if (range < MaxScrollValue)
1348                 set_offset(scale_ * value);
1349         else {
1350                 double length = 0;
1351                 Timestamp offset;
1352                 get_scroll_layout(length, offset);
1353                 set_offset(scale_ * length * value / MaxScrollValue);
1354         }
1355
1356         ruler_->update();
1357         viewport_->update();
1358 }
1359
1360 void View::v_scroll_value_changed()
1361 {
1362         header_->update();
1363         viewport_->update();
1364 }
1365
1366 void View::signals_changed()
1367 {
1368         using sigrok::Channel;
1369
1370         vector< shared_ptr<Channel> > channels;
1371         shared_ptr<sigrok::Device> sr_dev;
1372         bool signals_added_or_removed = false;
1373
1374         // Do we need to set the vertical scrollbar to its default position later?
1375         // We do if there are no traces, i.e. the scroll bar has no range set
1376         bool reset_scrollbar =
1377                 (scrollarea_->verticalScrollBar()->minimum() ==
1378                         scrollarea_->verticalScrollBar()->maximum());
1379
1380         if (!session_.device()) {
1381                 reset_scroll();
1382                 signals_.clear();
1383         } else {
1384                 sr_dev = session_.device()->device();
1385                 assert(sr_dev);
1386                 channels = sr_dev->channels();
1387         }
1388
1389         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1390
1391         // Make a list of traces that are being added, and a list of traces
1392         // that are being removed
1393         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1394         const set<shared_ptr<Trace>> prev_traces(
1395                 prev_trace_list.begin(), prev_trace_list.end());
1396
1397         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1398
1399 #ifdef ENABLE_DECODE
1400         traces.insert(decode_traces_.begin(), decode_traces_.end());
1401 #endif
1402
1403         set< shared_ptr<Trace> > add_traces;
1404         set_difference(traces.begin(), traces.end(),
1405                 prev_traces.begin(), prev_traces.end(),
1406                 inserter(add_traces, add_traces.begin()));
1407
1408         set< shared_ptr<Trace> > remove_traces;
1409         set_difference(prev_traces.begin(), prev_traces.end(),
1410                 traces.begin(), traces.end(),
1411                 inserter(remove_traces, remove_traces.begin()));
1412
1413         // Make a look-up table of sigrok Channels to pulseview Signals
1414         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1415                 signal_map;
1416         for (const shared_ptr<Signal> &sig : signals_)
1417                 signal_map[sig->base()] = sig;
1418
1419         // Populate channel groups
1420         if (sr_dev)
1421                 for (auto entry : sr_dev->channel_groups()) {
1422                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1423
1424                         if (group->channels().size() <= 1)
1425                                 continue;
1426
1427                         // Find best trace group to add to
1428                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1429                                 group, signal_map);
1430
1431                         // If there is no trace group, create one
1432                         shared_ptr<TraceGroup> new_trace_group;
1433                         if (!owner) {
1434                                 new_trace_group.reset(new TraceGroup());
1435                                 owner = new_trace_group.get();
1436                         }
1437
1438                         // Extract traces for the trace group, removing them from
1439                         // the add list
1440                         const vector< shared_ptr<Trace> > new_traces_in_group =
1441                                 extract_new_traces_for_channels(group->channels(),
1442                                         signal_map, add_traces);
1443
1444                         // Add the traces to the group
1445                         const pair<int, int> prev_v_extents = owner->v_extents();
1446                         int offset = prev_v_extents.second - prev_v_extents.first;
1447                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1448                                 assert(trace);
1449                                 owner->add_child_item(trace);
1450
1451                                 const pair<int, int> extents = trace->v_extents();
1452                                 if (trace->enabled())
1453                                         offset += -extents.first;
1454                                 trace->force_to_v_offset(offset);
1455                                 if (trace->enabled())
1456                                         offset += extents.second;
1457                         }
1458
1459                         if (new_trace_group) {
1460                                 // Assign proper vertical offsets to each channel in the group
1461                                 new_trace_group->restack_items();
1462
1463                                 // If this is a new group, enqueue it in the new top level
1464                                 // items list
1465                                 if (!new_traces_in_group.empty())
1466                                         new_top_level_items.push_back(new_trace_group);
1467                         }
1468                 }
1469
1470         // Enqueue the remaining logic channels in a group
1471         vector< shared_ptr<Channel> > logic_channels;
1472         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1473                 [](const shared_ptr<Channel>& c) {
1474                         return c->type() == sigrok::ChannelType::LOGIC; });
1475
1476         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1477                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1478
1479         if (non_grouped_logic_signals.size() > 0) {
1480                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1481                         make_shared<TraceGroup>());
1482                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1483                         non_grouped_trace_group->add_child_item(trace);
1484
1485                 non_grouped_trace_group->restack_items();
1486                 new_top_level_items.push_back(non_grouped_trace_group);
1487         }
1488
1489         // Enqueue the remaining channels as free ungrouped traces
1490         const vector< shared_ptr<Trace> > new_top_level_signals =
1491                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1492         new_top_level_items.insert(new_top_level_items.end(),
1493                 new_top_level_signals.begin(), new_top_level_signals.end());
1494
1495         // Enqueue any remaining traces i.e. decode traces
1496         new_top_level_items.insert(new_top_level_items.end(),
1497                 add_traces.begin(), add_traces.end());
1498
1499         // Remove any removed traces
1500         for (shared_ptr<Trace> trace : remove_traces) {
1501                 TraceTreeItemOwner *const owner = trace->owner();
1502                 assert(owner);
1503                 owner->remove_child_item(trace);
1504                 signals_added_or_removed = true;
1505         }
1506
1507         // Remove any empty trace groups
1508         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1509                 if (group->child_items().size() == 0) {
1510                         remove_child_item(group);
1511                         group.reset();
1512                 }
1513
1514         // Add and position the pending top levels items
1515         int offset = v_extents().second;
1516         for (auto item : new_top_level_items) {
1517                 add_child_item(item);
1518
1519                 // Position the item after the last item or at the top if there is none
1520                 const pair<int, int> extents = item->v_extents();
1521
1522                 if (item->enabled())
1523                         offset += -extents.first;
1524
1525                 item->force_to_v_offset(offset);
1526
1527                 if (item->enabled())
1528                         offset += extents.second;
1529                 signals_added_or_removed = true;
1530         }
1531
1532
1533         if (signals_added_or_removed && !header_was_shrunk_)
1534                 resize_header_to_fit();
1535
1536         update_layout();
1537
1538         header_->update();
1539         viewport_->update();
1540
1541         if (reset_scrollbar)
1542                 set_scroll_default();
1543 }
1544
1545 void View::capture_state_updated(int state)
1546 {
1547         GlobalSettings settings;
1548
1549         if (state == Session::Running) {
1550                 set_time_unit(util::TimeUnit::Samples);
1551
1552                 trigger_markers_.clear();
1553
1554                 scale_at_acq_start_ = scale_;
1555                 offset_at_acq_start_ = offset_;
1556
1557                 // Activate "always zoom to fit" if the setting is enabled and we're
1558                 // the main view of this session (other trace views may be used for
1559                 // zooming and we don't want to mess them up)
1560                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1561                 if (is_main_view_ && state) {
1562                         always_zoom_to_fit_ = true;
1563                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1564                 }
1565
1566                 // Enable sticky scrolling if the setting is enabled
1567                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1568
1569                 // Reset all traces to segment 0
1570                 current_segment_ = 0;
1571                 set_current_segment(current_segment_);
1572         }
1573
1574         if (state == Session::Stopped) {
1575                 // After acquisition has stopped we need to re-calculate the ticks once
1576                 // as it's otherwise done when the user pans or zooms, which is too late
1577                 calculate_tick_spacing();
1578
1579                 // Reset "always zoom to fit", the acquisition has stopped
1580                 if (always_zoom_to_fit_) {
1581                         // Perform a final zoom-to-fit before disabling
1582                         zoom_fit(always_zoom_to_fit_);
1583                         always_zoom_to_fit_ = false;
1584                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1585                 }
1586
1587                 bool zoom_to_fit_after_acq =
1588                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1589
1590                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1591                 // we didn't restore settings in the meanwhile
1592                 if (zoom_to_fit_after_acq &&
1593                         !suppress_zoom_to_fit_after_acq_ &&
1594                         (scale_ == scale_at_acq_start_) &&
1595                         (offset_ == offset_at_acq_start_))
1596                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1597
1598                 suppress_zoom_to_fit_after_acq_ = false;
1599         }
1600 }
1601
1602 void View::on_new_segment(int new_segment_id)
1603 {
1604         on_segment_changed(new_segment_id);
1605 }
1606
1607 void View::on_segment_completed(int segment_id)
1608 {
1609         on_segment_changed(segment_id);
1610 }
1611
1612 void View::on_segment_changed(int segment)
1613 {
1614         switch (segment_display_mode_) {
1615         case Trace::ShowLastSegmentOnly:
1616         case Trace::ShowSingleSegmentOnly:
1617                 set_current_segment(segment);
1618                 break;
1619
1620         case Trace::ShowLastCompleteSegmentOnly:
1621                 // Only update if all segments are complete
1622                 if (session_.all_segments_complete(segment))
1623                         set_current_segment(segment);
1624                 break;
1625
1626         case Trace::ShowAllSegments:
1627         case Trace::ShowAccumulatedIntensity:
1628         default:
1629                 break;
1630         }
1631 }
1632
1633 void View::on_settingViewTriggerIsZeroTime_changed(const QVariant new_value)
1634 {
1635         if (new_value.toBool()) {
1636                 // The first trigger for this segment is used as the zero position
1637                 vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
1638                 if (triggers.size() > 0)
1639                         set_zero_position(triggers.front());
1640         } else
1641                 reset_zero_position();
1642 }
1643
1644 void View::perform_delayed_view_update()
1645 {
1646         if (always_zoom_to_fit_) {
1647                 zoom_fit(true);
1648         } else if (sticky_scrolling_) {
1649                 // Make right side of the view sticky
1650                 double length = 0;
1651                 Timestamp offset;
1652                 get_scroll_layout(length, offset);
1653
1654                 const QSize areaSize = viewport_->size();
1655                 length = max(length - areaSize.width(), 0.0);
1656
1657                 set_offset(scale_ * length);
1658         }
1659
1660         determine_time_unit();
1661         update_scroll();
1662         ruler_->update();
1663         viewport_->update();
1664 }
1665
1666 void View::process_sticky_events()
1667 {
1668         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1669                 update_layout();
1670         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1671                 restack_all_trace_tree_items();
1672                 update_scroll();
1673         }
1674
1675         // Clear the sticky events
1676         sticky_events_ = 0;
1677 }
1678
1679 } // namespace trace
1680 } // namespace views
1681 } // namespace pv