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