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         cursor_state_changed(show_cursors_);
 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         segment_display_mode_ = mode;
 623
 624         for (shared_ptr<Signal> signal : signals_)
 625                 signal->set_segment_display_mode(mode);
 626
 627         uint32_t last_segment = session_.get_segment_count() - 1;
 628
 629         switch (mode) {
 630         case Trace::ShowLastSegmentOnly:
 631                 if (current_segment_ != last_segment)
 632                         set_current_segment(last_segment);
 633                 break;
 634
 635         case Trace::ShowLastCompleteSegmentOnly:
 636                 // Do nothing if we only have one segment so far
 637                 if (last_segment > 0) {
 638                         // If the last segment isn't complete, the previous one must be
 639                         uint32_t segment_id =
 640                                 (session_.all_segments_complete(last_segment)) ?
 641                                 last_segment : last_segment - 1;
 642
 643                         if (current_segment_ != segment_id)
 644                                 set_current_segment(segment_id);
 645                 }
 646                 break;
 647
 648         case Trace::ShowSingleSegmentOnly:
 649         case Trace::ShowAllSegments:
 650         case Trace::ShowAccumulatedIntensity:
 651         default:
 652                 // Current segment remains as-is
 653                 break;
 654         }
 655
 656         segment_selectable_ = true;
 657
 658         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 659                 segment_selectable_ = false;
 660
 661         viewport_->update();
 662
 663         segment_display_mode_changed((int)mode, segment_selectable_);
 664 }
 665
 666 void View::zoom(double steps)
 667 {
 668         zoom(steps, viewport_->width() / 2);
 669 }
 670
 671 void View::zoom(double steps, int offset)
 672 {
 673         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 674 }
 675
 676 void View::zoom_fit(bool gui_state)
 677 {
 678         // Act as one-shot when stopped, toggle along with the GUI otherwise
 679         if (session_.get_capture_state() == Session::Stopped) {
 680                 always_zoom_to_fit_ = false;
 681                 always_zoom_to_fit_changed(false);
 682         } else {
 683                 always_zoom_to_fit_ = gui_state;
 684                 always_zoom_to_fit_changed(gui_state);
 685         }
 686
 687         const pair<Timestamp, Timestamp> extents = get_time_extents();
 688         const Timestamp delta = extents.second - extents.first;
 689         if (delta < Timestamp("1e-12"))
 690                 return;
 691
 692         assert(viewport_);
 693         const int w = viewport_->width();
 694         if (w <= 0)
 695                 return;
 696
 697         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 698         set_scale_offset(scale.convert_to<double>(), extents.first);
 699 }
 700
 701 void View::set_scale_offset(double scale, const Timestamp& offset)
 702 {
 703         // Disable sticky scrolling / always zoom to fit when acquisition runs
 704         // and user drags the viewport
 705         if ((scale_ == scale) && (offset_ != offset) &&
 706                         (session_.get_capture_state() == Session::Running)) {
 707
 708                 if (sticky_scrolling_) {
 709                         sticky_scrolling_ = false;
 710                         sticky_scrolling_changed(false);
 711                 }
 712
 713                 if (always_zoom_to_fit_) {
 714                         always_zoom_to_fit_ = false;
 715                         always_zoom_to_fit_changed(false);
 716                 }
 717         }
 718
 719         set_scale(scale);
 720         set_offset(offset);
 721
 722         calculate_tick_spacing();
 723
 724         update_scroll();
 725         ruler_->update();
 726         viewport_->update();
 727 }
 728
 729 set< shared_ptr<SignalData> > View::get_visible_data() const
 730 {
 731         // Make a set of all the visible data objects
 732         set< shared_ptr<SignalData> > visible_data;
 733         for (const shared_ptr<Signal> sig : signals_)
 734                 if (sig->enabled())
 735                         visible_data.insert(sig->data());
 736
 737         return visible_data;
 738 }
 739
 740 pair<Timestamp, Timestamp> View::get_time_extents() const
 741 {
 742         boost::optional<Timestamp> left_time, right_time;
 743         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 744         for (const shared_ptr<SignalData> d : visible_data) {
 745                 const vector< shared_ptr<Segment> > segments = d->segments();
 746                 for (const shared_ptr<Segment> &s : segments) {
 747                         double samplerate = s->samplerate();
 748                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 749
 750                         const Timestamp start_time = s->start_time();
 751                         left_time = left_time ?
 752                                 min(*left_time, start_time) :
 753                                                 start_time;
 754                         right_time = right_time ?
 755                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 756                                                  start_time + d->max_sample_count() / samplerate;
 757                 }
 758         }
 759
 760         if (!left_time || !right_time)
 761                 return make_pair(0, 0);
 762
 763         assert(*left_time < *right_time);
 764         return make_pair(*left_time, *right_time);
 765 }
 766
 767 void View::enable_show_sampling_points(bool state)
 768 {
 769         (void)state;
 770
 771         viewport_->update();
 772 }
 773
 774 void View::enable_show_analog_minor_grid(bool state)
 775 {
 776         (void)state;
 777
 778         viewport_->update();
 779 }
 780
 781 void View::enable_colored_bg(bool state)
 782 {
 783         colored_bg_ = state;
 784         viewport_->update();
 785 }
 786
 787 bool View::colored_bg() const
 788 {
 789         return colored_bg_;
 790 }
 791
 792 bool View::cursors_shown() const
 793 {
 794         return show_cursors_;
 795 }
 796
 797 void View::show_cursors(bool show)
 798 {
 799         show_cursors_ = show;
 800         cursor_state_changed(show);
 801         ruler_->update();
 802         viewport_->update();
 803 }
 804
 805 void View::centre_cursors()
 806 {
 807         if (cursors_) {
 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
 812                 ruler_->update();
 813                 viewport_->update();
 814         }
 815 }
 816
 817 shared_ptr<CursorPair> View::cursors() const
 818 {
 819         return cursors_;
 820 }
 821
 822 void View::add_flag(const Timestamp& time)
 823 {
 824         flags_.push_back(make_shared<Flag>(*this, time,
 825                 QString("%1").arg(next_flag_text_)));
 826
 827         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 828                 (next_flag_text_ + 1);
 829
 830         time_item_appearance_changed(true, true);
 831 }
 832
 833 void View::remove_flag(shared_ptr<Flag> flag)
 834 {
 835         flags_.remove(flag);
 836         time_item_appearance_changed(true, true);
 837 }
 838
 839 vector< shared_ptr<Flag> > View::flags() const
 840 {
 841         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 842         stable_sort(flags.begin(), flags.end(),
 843                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 844                         return a->time() < b->time();
 845                 });
 846
 847         return flags;
 848 }
 849
 850 const QPoint& View::hover_point() const
 851 {
 852         return hover_point_;
 853 }
 854
 855 void View::restack_all_trace_tree_items()
 856 {
 857         // Make a list of owners that is sorted from deepest first
 858         const vector<shared_ptr<TraceTreeItem>> items(
 859                 list_by_type<TraceTreeItem>());
 860         set< TraceTreeItemOwner* > owners;
 861         for (const auto &r : items)
 862                 owners.insert(r->owner());
 863         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 864         sort(sorted_owners.begin(), sorted_owners.end(),
 865                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 866                         return a->depth() > b->depth(); });
 867
 868         // Restack the items recursively
 869         for (auto &o : sorted_owners)
 870                 o->restack_items();
 871
 872         // Animate the items to their destination
 873         for (const auto &i : items)
 874                 i->animate_to_layout_v_offset();
 875 }
 876
 877 void View::on_setting_changed(const QString &key, const QVariant &value)
 878 {
 879         if (key == GlobalSettings::Key_View_TriggerIsZeroTime)
 880                 on_settingViewTriggerIsZeroTime_changed(value);
 881 }
 882
 883 void View::trigger_event(int segment_id, util::Timestamp location)
 884 {
 885         // TODO This doesn't work if we're showing multiple segments at once
 886         if ((uint32_t)segment_id != current_segment_)
 887                 return;
 888
 889         // Set zero location if the Key_View_TriggerIsZeroTime setting is set and
 890         // if this is the first trigger for this segment.
 891         GlobalSettings settings;
 892         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 893
 894         size_t trigger_count = session_.get_triggers(current_segment_).size();
 895
 896         if (trigger_is_zero_time && trigger_count == 1)
 897                 set_zero_position(location);
 898
 899         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 900 }
 901
 902 void View::get_scroll_layout(double &length, Timestamp &offset) const
 903 {
 904         const pair<Timestamp, Timestamp> extents = get_time_extents();
 905         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 906         offset = offset_ / scale_;
 907 }
 908
 909 void View::set_zoom(double scale, int offset)
 910 {
 911         // Reset the "always zoom to fit" feature as the user changed the zoom
 912         always_zoom_to_fit_ = false;
 913         always_zoom_to_fit_changed(false);
 914
 915         const Timestamp cursor_offset = offset_ + scale_ * offset;
 916         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 917         const Timestamp new_offset = cursor_offset - new_scale * offset;
 918         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 919 }
 920
 921 void View::calculate_tick_spacing()
 922 {
 923         const double SpacingIncrement = 10.0f;
 924         const double MinValueSpacing = 40.0f;
 925
 926         // Figure out the highest numeric value visible on a label
 927         const QSize areaSize = viewport_->size();
 928         const Timestamp max_time = max(fabs(offset_),
 929                 fabs(offset_ + scale_ * areaSize.width()));
 930
 931         double min_width = SpacingIncrement;
 932         double label_width, tick_period_width;
 933
 934         QFontMetrics m(QApplication::font());
 935
 936         // Copies of the member variables with the same name, used in the calculation
 937         // and written back afterwards, so that we don't emit signals all the time
 938         // during the calculation.
 939         pv::util::Timestamp tick_period = tick_period_;
 940         pv::util::SIPrefix tick_prefix = tick_prefix_;
 941         unsigned tick_precision = tick_precision_;
 942
 943         do {
 944                 const double min_period = scale_ * min_width;
 945
 946                 const int order = (int)floorf(log10f(min_period));
 947                 const pv::util::Timestamp order_decimal =
 948                         pow(pv::util::Timestamp(10), order);
 949
 950                 // Allow for a margin of error so that a scale unit of 1 can be used.
 951                 // Otherwise, for a SU of 1 the tick period will almost always be below
 952                 // the min_period by a small amount - and thus skipped in favor of 2.
 953                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 954                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 955                 double tp_with_margin;
 956                 unsigned int unit = 0;
 957
 958                 do {
 959                         tp_with_margin = order_decimal.convert_to<double>() *
 960                                 (ScaleUnits[unit++] + tp_margin);
 961                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 962
 963                 minor_tick_count_ = (unit == 2) ? 4 : 5;
 964                 tick_period = order_decimal * ScaleUnits[unit - 1];
 965                 tick_prefix = static_cast<pv::util::SIPrefix>(
 966                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 967
 968                 // Precision is the number of fractional digits required, not
 969                 // taking the prefix into account (and it must never be negative)
 970                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 971
 972                 tick_period_width = (tick_period / scale_).convert_to<double>();
 973
 974                 const QString label_text = Ruler::format_time_with_distance(
 975                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 976
 977                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 978                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 979                                 MinValueSpacing;
 980
 981                 min_width += SpacingIncrement;
 982         } while (tick_period_width < label_width);
 983
 984         set_tick_period(tick_period);
 985         set_tick_prefix(tick_prefix);
 986         set_tick_precision(tick_precision);
 987 }
 988
 989 void View::adjust_top_margin()
 990 {
 991         assert(viewport_);
 992
 993         const QSize areaSize = viewport_->size();
 994
 995         const pair<int, int> extents = v_extents();
 996         const int top_margin = owner_visual_v_offset() + extents.first;
 997         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
 998
 999         // Do we have empty space at the top while the last trace goes out of screen?
1000         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
1001                 const int trace_height = extents.second - extents.first;
1002
1003                 // Center everything vertically if there is enough space
1004                 if (areaSize.height() >= trace_height)
1005                         set_v_offset(extents.first -
1006                                 ((areaSize.height() - trace_height) / 2));
1007                 else
1008                         // Remove the top margin to make as many traces fit on screen as possible
1009                         set_v_offset(extents.first);
1010         }
1011 }
1012
1013 void View::update_scroll()
1014 {
1015         assert(viewport_);
1016         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
1017         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
1018
1019         const QSize areaSize = viewport_->size();
1020
1021         // Set the horizontal scroll bar
1022         double length = 0;
1023         Timestamp offset;
1024         get_scroll_layout(length, offset);
1025         length = max(length - areaSize.width(), 0.0);
1026
1027         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
1028
1029         hscrollbar->setPageStep(areaSize.width() / 2);
1030         hscrollbar->setSingleStep(major_tick_distance);
1031
1032         updating_scroll_ = true;
1033
1034         if (length < MaxScrollValue) {
1035                 hscrollbar->setRange(0, length);
1036                 hscrollbar->setSliderPosition(offset.convert_to<double>());
1037         } else {
1038                 hscrollbar->setRange(0, MaxScrollValue);
1039                 hscrollbar->setSliderPosition(
1040                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
1041         }
1042
1043         updating_scroll_ = false;
1044
1045         // Set the vertical scrollbar
1046         vscrollbar->setPageStep(areaSize.height());
1047         vscrollbar->setSingleStep(areaSize.height() / 8);
1048
1049         const pair<int, int> extents = v_extents();
1050
1051         // Don't change the scrollbar range if there are no traces
1052         if (extents.first != extents.second)
1053                 vscrollbar->setRange(extents.first - areaSize.height(),
1054                         extents.second);
1055
1056         if (scroll_needs_defaults_)
1057                 set_scroll_default();
1058 }
1059
1060 void View::reset_scroll()
1061 {
1062         scrollarea_->verticalScrollBar()->setRange(0, 0);
1063 }
1064
1065 void View::set_scroll_default()
1066 {
1067         assert(viewport_);
1068
1069         const QSize areaSize = viewport_->size();
1070
1071         const pair<int, int> extents = v_extents();
1072         const int trace_height = extents.second - extents.first;
1073
1074         // Do all traces fit in the view?
1075         if (areaSize.height() >= trace_height)
1076                 // Center all traces vertically
1077                 set_v_offset(extents.first -
1078                         ((areaSize.height() - trace_height) / 2));
1079         else
1080                 // Put the first trace at the top, letting the bottom ones overflow
1081                 set_v_offset(extents.first);
1082 }
1083
1084 void View::determine_if_header_was_shrunk()
1085 {
1086         const int header_pane_width = splitter_->sizes().front();
1087         const int header_width = header_->extended_size_hint().width();
1088
1089         // Allow for a slight margin of error so that we also accept
1090         // slight differences when e.g. a label name change increased
1091         // the overall width
1092         header_was_shrunk_ = (header_pane_width < (header_width - 10));
1093 }
1094
1095 void View::resize_header_to_fit()
1096 {
1097         // Setting the maximum width of the header widget doesn't work as
1098         // expected because the splitter would allow the user to make the
1099         // pane wider than that, creating empty space as a result.
1100         // To make this work, we stricly enforce the maximum width by
1101         // expanding the header unless the user shrunk it on purpose.
1102         // As we're then setting the width of the header pane, we set the
1103         // splitter to the maximum allowed position.
1104
1105         int splitter_area_width = 0;
1106         for (int w : splitter_->sizes())
1107                 splitter_area_width += w;
1108
1109         // Make sure the header has enough horizontal space to show all labels fully
1110         QList<int> pane_sizes;
1111         pane_sizes.push_back(header_->extended_size_hint().width());
1112         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1113         splitter_->setSizes(pane_sizes);
1114 }
1115
1116 void View::update_layout()
1117 {
1118         update_scroll();
1119 }
1120
1121 TraceTreeItemOwner* View::find_prevalent_trace_group(
1122         const shared_ptr<sigrok::ChannelGroup> &group,
1123         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1124                 &signal_map)
1125 {
1126         assert(group);
1127
1128         unordered_set<TraceTreeItemOwner*> owners;
1129         vector<TraceTreeItemOwner*> owner_list;
1130
1131         // Make a set and a list of all the owners
1132         for (const auto &channel : group->channels()) {
1133                 for (auto entry : signal_map) {
1134                         if (entry.first->channel() == channel) {
1135                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1136                                 owner_list.push_back(o);
1137                                 owners.insert(o);
1138                         }
1139                 }
1140         }
1141
1142         // Iterate through the list of owners, and find the most prevalent
1143         size_t max_prevalence = 0;
1144         TraceTreeItemOwner *prevalent_owner = nullptr;
1145         for (TraceTreeItemOwner *owner : owners) {
1146                 const size_t prevalence = count_if(
1147                         owner_list.begin(), owner_list.end(),
1148                         [&](TraceTreeItemOwner *o) { return o == owner; });
1149                 if (prevalence > max_prevalence) {
1150                         max_prevalence = prevalence;
1151                         prevalent_owner = owner;
1152                 }
1153         }
1154
1155         return prevalent_owner;
1156 }
1157
1158 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1159         const vector< shared_ptr<sigrok::Channel> > &channels,
1160         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1161                 &signal_map,
1162         set< shared_ptr<Trace> > &add_list)
1163 {
1164         vector< shared_ptr<Trace> > filtered_traces;
1165
1166         for (const auto &channel : channels) {
1167                 for (auto entry : signal_map) {
1168                         if (entry.first->channel() == channel) {
1169                                 shared_ptr<Trace> trace = entry.second;
1170                                 const auto list_iter = add_list.find(trace);
1171                                 if (list_iter == add_list.end())
1172                                         continue;
1173
1174                                 filtered_traces.push_back(trace);
1175                                 add_list.erase(list_iter);
1176                         }
1177                 }
1178         }
1179
1180         return filtered_traces;
1181 }
1182
1183 void View::determine_time_unit()
1184 {
1185         // Check whether we know the sample rate and hence can use time as the unit
1186         if (time_unit_ == util::TimeUnit::Samples) {
1187                 // Check all signals but...
1188                 for (const shared_ptr<Signal> signal : signals_) {
1189                         const shared_ptr<SignalData> data = signal->data();
1190
1191                         // ...only check first segment of each
1192                         const vector< shared_ptr<Segment> > segments = data->segments();
1193                         if (!segments.empty())
1194                                 if (segments[0]->samplerate()) {
1195                                         set_time_unit(util::TimeUnit::Time);
1196                                         break;
1197                                 }
1198                 }
1199         }
1200 }
1201
1202 bool View::eventFilter(QObject *object, QEvent *event)
1203 {
1204         const QEvent::Type type = event->type();
1205         if (type == QEvent::MouseMove) {
1206
1207                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1208                 if (object == viewport_)
1209                         hover_point_ = mouse_event->pos();
1210                 else if (object == ruler_)
1211                         hover_point_ = QPoint(mouse_event->x(), 0);
1212                 else if (object == header_)
1213                         hover_point_ = QPoint(0, mouse_event->y());
1214                 else
1215                         hover_point_ = QPoint(-1, -1);
1216
1217                 update_hover_point();
1218
1219         } else if (type == QEvent::Leave) {
1220                 hover_point_ = QPoint(-1, -1);
1221                 update_hover_point();
1222         } else if (type == QEvent::Show) {
1223
1224                 // This is somewhat of a hack, unfortunately. We cannot use
1225                 // set_v_offset() from within restore_settings() as the view
1226                 // at that point is neither visible nor properly sized.
1227                 // This is the least intrusive workaround I could come up
1228                 // with: set the vertical offset (or scroll defaults) when
1229                 // the view is shown, which happens after all widgets were
1230                 // resized to their final sizes.
1231                 update_layout();
1232
1233                 if (settings_restored_)
1234                         determine_if_header_was_shrunk();
1235                 else
1236                         resize_header_to_fit();
1237
1238                 if (scroll_needs_defaults_) {
1239                         set_scroll_default();
1240                         scroll_needs_defaults_ = false;
1241                 }
1242
1243                 if (saved_v_offset_) {
1244                         set_v_offset(saved_v_offset_);
1245                         saved_v_offset_ = 0;
1246                 }
1247         }
1248
1249         return QObject::eventFilter(object, event);
1250 }
1251
1252 void View::resizeEvent(QResizeEvent* event)
1253 {
1254         // Only adjust the top margin if we shrunk vertically
1255         if (event->size().height() < event->oldSize().height())
1256                 adjust_top_margin();
1257
1258         update_layout();
1259 }
1260
1261 void View::update_hover_point()
1262 {
1263         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1264                 list_by_type<TraceTreeItem>());
1265         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1266                 r->hover_point_changed(hover_point_);
1267
1268         hover_point_changed(hover_point_);
1269 }
1270
1271 void View::row_item_appearance_changed(bool label, bool content)
1272 {
1273         if (label)
1274                 header_->update();
1275         if (content)
1276                 viewport_->update();
1277 }
1278
1279 void View::time_item_appearance_changed(bool label, bool content)
1280 {
1281         if (label) {
1282                 ruler_->update();
1283
1284                 // Make sure the header pane width is updated, too
1285                 update_layout();
1286         }
1287
1288         if (content)
1289                 viewport_->update();
1290 }
1291
1292 void View::extents_changed(bool horz, bool vert)
1293 {
1294         sticky_events_ |=
1295                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1296                 (vert ? TraceTreeItemVExtentsChanged : 0);
1297
1298         lazy_event_handler_.start();
1299 }
1300
1301 void View::on_signal_name_changed()
1302 {
1303         if (!header_was_shrunk_)
1304                 resize_header_to_fit();
1305 }
1306
1307 void View::on_splitter_moved()
1308 {
1309         // The header can only shrink when the splitter is moved manually
1310         determine_if_header_was_shrunk();
1311
1312         if (!header_was_shrunk_)
1313                 resize_header_to_fit();
1314 }
1315
1316 void View::h_scroll_value_changed(int value)
1317 {
1318         if (updating_scroll_)
1319                 return;
1320
1321         // Disable sticky scrolling when user moves the horizontal scroll bar
1322         // during a running acquisition
1323         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1324                 sticky_scrolling_ = false;
1325                 sticky_scrolling_changed(false);
1326         }
1327
1328         const int range = scrollarea_->horizontalScrollBar()->maximum();
1329         if (range < MaxScrollValue)
1330                 set_offset(scale_ * value);
1331         else {
1332                 double length = 0;
1333                 Timestamp offset;
1334                 get_scroll_layout(length, offset);
1335                 set_offset(scale_ * length * value / MaxScrollValue);
1336         }
1337
1338         ruler_->update();
1339         viewport_->update();
1340 }
1341
1342 void View::v_scroll_value_changed()
1343 {
1344         header_->update();
1345         viewport_->update();
1346 }
1347
1348 void View::signals_changed()
1349 {
1350         using sigrok::Channel;
1351
1352         vector< shared_ptr<Channel> > channels;
1353         shared_ptr<sigrok::Device> sr_dev;
1354         bool signals_added_or_removed = false;
1355
1356         // Do we need to set the vertical scrollbar to its default position later?
1357         // We do if there are no traces, i.e. the scroll bar has no range set
1358         bool reset_scrollbar =
1359                 (scrollarea_->verticalScrollBar()->minimum() ==
1360                         scrollarea_->verticalScrollBar()->maximum());
1361
1362         if (!session_.device()) {
1363                 reset_scroll();
1364                 signals_.clear();
1365         } else {
1366                 sr_dev = session_.device()->device();
1367                 assert(sr_dev);
1368                 channels = sr_dev->channels();
1369         }
1370
1371         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1372
1373         // Make a list of traces that are being added, and a list of traces
1374         // that are being removed
1375         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1376         const set<shared_ptr<Trace>> prev_traces(
1377                 prev_trace_list.begin(), prev_trace_list.end());
1378
1379         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1380
1381 #ifdef ENABLE_DECODE
1382         traces.insert(decode_traces_.begin(), decode_traces_.end());
1383 #endif
1384
1385         set< shared_ptr<Trace> > add_traces;
1386         set_difference(traces.begin(), traces.end(),
1387                 prev_traces.begin(), prev_traces.end(),
1388                 inserter(add_traces, add_traces.begin()));
1389
1390         set< shared_ptr<Trace> > remove_traces;
1391         set_difference(prev_traces.begin(), prev_traces.end(),
1392                 traces.begin(), traces.end(),
1393                 inserter(remove_traces, remove_traces.begin()));
1394
1395         // Make a look-up table of sigrok Channels to pulseview Signals
1396         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1397                 signal_map;
1398         for (const shared_ptr<Signal> &sig : signals_)
1399                 signal_map[sig->base()] = sig;
1400
1401         // Populate channel groups
1402         if (sr_dev)
1403                 for (auto entry : sr_dev->channel_groups()) {
1404                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1405
1406                         if (group->channels().size() <= 1)
1407                                 continue;
1408
1409                         // Find best trace group to add to
1410                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1411                                 group, signal_map);
1412
1413                         // If there is no trace group, create one
1414                         shared_ptr<TraceGroup> new_trace_group;
1415                         if (!owner) {
1416                                 new_trace_group.reset(new TraceGroup());
1417                                 owner = new_trace_group.get();
1418                         }
1419
1420                         // Extract traces for the trace group, removing them from
1421                         // the add list
1422                         const vector< shared_ptr<Trace> > new_traces_in_group =
1423                                 extract_new_traces_for_channels(group->channels(),
1424                                         signal_map, add_traces);
1425
1426                         // Add the traces to the group
1427                         const pair<int, int> prev_v_extents = owner->v_extents();
1428                         int offset = prev_v_extents.second - prev_v_extents.first;
1429                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1430                                 assert(trace);
1431                                 owner->add_child_item(trace);
1432
1433                                 const pair<int, int> extents = trace->v_extents();
1434                                 if (trace->enabled())
1435                                         offset += -extents.first;
1436                                 trace->force_to_v_offset(offset);
1437                                 if (trace->enabled())
1438                                         offset += extents.second;
1439                         }
1440
1441                         if (new_trace_group) {
1442                                 // Assign proper vertical offsets to each channel in the group
1443                                 new_trace_group->restack_items();
1444
1445                                 // If this is a new group, enqueue it in the new top level
1446                                 // items list
1447                                 if (!new_traces_in_group.empty())
1448                                         new_top_level_items.push_back(new_trace_group);
1449                         }
1450                 }
1451
1452         // Enqueue the remaining logic channels in a group
1453         vector< shared_ptr<Channel> > logic_channels;
1454         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1455                 [](const shared_ptr<Channel>& c) {
1456                         return c->type() == sigrok::ChannelType::LOGIC; });
1457
1458         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1459                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1460
1461         if (non_grouped_logic_signals.size() > 0) {
1462                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1463                         make_shared<TraceGroup>());
1464                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1465                         non_grouped_trace_group->add_child_item(trace);
1466
1467                 non_grouped_trace_group->restack_items();
1468                 new_top_level_items.push_back(non_grouped_trace_group);
1469         }
1470
1471         // Enqueue the remaining channels as free ungrouped traces
1472         const vector< shared_ptr<Trace> > new_top_level_signals =
1473                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1474         new_top_level_items.insert(new_top_level_items.end(),
1475                 new_top_level_signals.begin(), new_top_level_signals.end());
1476
1477         // Enqueue any remaining traces i.e. decode traces
1478         new_top_level_items.insert(new_top_level_items.end(),
1479                 add_traces.begin(), add_traces.end());
1480
1481         // Remove any removed traces
1482         for (shared_ptr<Trace> trace : remove_traces) {
1483                 TraceTreeItemOwner *const owner = trace->owner();
1484                 assert(owner);
1485                 owner->remove_child_item(trace);
1486                 signals_added_or_removed = true;
1487         }
1488
1489         // Remove any empty trace groups
1490         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1491                 if (group->child_items().size() == 0) {
1492                         remove_child_item(group);
1493                         group.reset();
1494                 }
1495
1496         // Add and position the pending top levels items
1497         int offset = v_extents().second;
1498         for (auto item : new_top_level_items) {
1499                 add_child_item(item);
1500
1501                 // Position the item after the last item or at the top if there is none
1502                 const pair<int, int> extents = item->v_extents();
1503
1504                 if (item->enabled())
1505                         offset += -extents.first;
1506
1507                 item->force_to_v_offset(offset);
1508
1509                 if (item->enabled())
1510                         offset += extents.second;
1511                 signals_added_or_removed = true;
1512         }
1513
1514
1515         if (signals_added_or_removed && !header_was_shrunk_)
1516                 resize_header_to_fit();
1517
1518         update_layout();
1519
1520         header_->update();
1521         viewport_->update();
1522
1523         if (reset_scrollbar)
1524                 set_scroll_default();
1525 }
1526
1527 void View::capture_state_updated(int state)
1528 {
1529         GlobalSettings settings;
1530
1531         if (state == Session::Running) {
1532                 set_time_unit(util::TimeUnit::Samples);
1533
1534                 trigger_markers_.clear();
1535
1536                 scale_at_acq_start_ = scale_;
1537                 offset_at_acq_start_ = offset_;
1538
1539                 // Activate "always zoom to fit" if the setting is enabled and we're
1540                 // the main view of this session (other trace views may be used for
1541                 // zooming and we don't want to mess them up)
1542                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1543                 if (is_main_view_ && state) {
1544                         always_zoom_to_fit_ = true;
1545                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1546                 }
1547
1548                 // Enable sticky scrolling if the setting is enabled
1549                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1550
1551                 // Reset all traces to segment 0
1552                 current_segment_ = 0;
1553                 set_current_segment(current_segment_);
1554         }
1555
1556         if (state == Session::Stopped) {
1557                 // After acquisition has stopped we need to re-calculate the ticks once
1558                 // as it's otherwise done when the user pans or zooms, which is too late
1559                 calculate_tick_spacing();
1560
1561                 // Reset "always zoom to fit", the acquisition has stopped
1562                 if (always_zoom_to_fit_) {
1563                         // Perform a final zoom-to-fit before disabling
1564                         zoom_fit(always_zoom_to_fit_);
1565                         always_zoom_to_fit_ = false;
1566                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1567                 }
1568
1569                 bool zoom_to_fit_after_acq =
1570                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1571
1572                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1573                 // we didn't restore settings in the meanwhile
1574                 if (zoom_to_fit_after_acq &&
1575                         !suppress_zoom_to_fit_after_acq_ &&
1576                         (scale_ == scale_at_acq_start_) &&
1577                         (offset_ == offset_at_acq_start_))
1578                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1579
1580                 suppress_zoom_to_fit_after_acq_ = false;
1581         }
1582 }
1583
1584 void View::on_new_segment(int new_segment_id)
1585 {
1586         on_segment_changed(new_segment_id);
1587 }
1588
1589 void View::on_segment_completed(int segment_id)
1590 {
1591         on_segment_changed(segment_id);
1592 }
1593
1594 void View::on_segment_changed(int segment)
1595 {
1596         switch (segment_display_mode_) {
1597         case Trace::ShowLastSegmentOnly:
1598         case Trace::ShowSingleSegmentOnly:
1599                 set_current_segment(segment);
1600                 break;
1601
1602         case Trace::ShowLastCompleteSegmentOnly:
1603                 // Only update if all segments are complete
1604                 if (session_.all_segments_complete(segment))
1605                         set_current_segment(segment);
1606                 break;
1607
1608         case Trace::ShowAllSegments:
1609         case Trace::ShowAccumulatedIntensity:
1610         default:
1611                 break;
1612         }
1613 }
1614
1615 void View::on_settingViewTriggerIsZeroTime_changed(const QVariant new_value)
1616 {
1617         if (new_value.toBool()) {
1618                 // The first trigger for this segment is used as the zero position
1619                 vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
1620                 if (triggers.size() > 0)
1621                         set_zero_position(triggers.front());
1622         } else
1623                 reset_zero_position();
1624 }
1625
1626 void View::perform_delayed_view_update()
1627 {
1628         if (always_zoom_to_fit_) {
1629                 zoom_fit(true);
1630         } else if (sticky_scrolling_) {
1631                 // Make right side of the view sticky
1632                 double length = 0;
1633                 Timestamp offset;
1634                 get_scroll_layout(length, offset);
1635
1636                 const QSize areaSize = viewport_->size();
1637                 length = max(length - areaSize.width(), 0.0);
1638
1639                 set_offset(scale_ * length);
1640         }
1641
1642         determine_time_unit();
1643         update_scroll();
1644         ruler_->update();
1645         viewport_->update();
1646 }
1647
1648 void View::process_sticky_events()
1649 {
1650         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1651                 update_layout();
1652         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1653                 restack_all_trace_tree_items();
1654                 update_scroll();
1655         }
1656
1657         // Clear the sticky events
1658         sticky_events_ = 0;
1659 }
1660
1661 } // namespace trace
1662 } // namespace views
1663 } // namespace pv