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::placeholders::_1;
  83 using std::set;
  84 using std::set_difference;
  85 using std::shared_ptr;
  86 using std::stringstream;
  87 using std::unordered_map;
  88 using std::unordered_set;
  89 using std::vector;
  90
  91 namespace pv {
  92 namespace views {
  93 namespace trace {
  94
  95 const Timestamp View::MaxScale("1e9");
  96 const Timestamp View::MinScale("1e-12");
  97
  98 const int View::MaxScrollValue = INT_MAX / 2;
  99
 100 const int View::ScaleUnits[3] = {1, 2, 5};
 101
 102
 103 CustomScrollArea::CustomScrollArea(QWidget *parent) :
 104         QAbstractScrollArea(parent)
 105 {
 106 }
 107
 108 bool CustomScrollArea::viewportEvent(QEvent *event)
 109 {
 110         switch (event->type()) {
 111         case QEvent::Paint:
 112         case QEvent::MouseButtonPress:
 113         case QEvent::MouseButtonRelease:
 114         case QEvent::MouseButtonDblClick:
 115         case QEvent::MouseMove:
 116         case QEvent::Wheel:
 117         case QEvent::TouchBegin:
 118         case QEvent::TouchUpdate:
 119         case QEvent::TouchEnd:
 120                 return false;
 121         default:
 122                 return QAbstractScrollArea::viewportEvent(event);
 123         }
 124 }
 125
 126 View::View(Session &session, bool is_main_view, QWidget *parent) :
 127         ViewBase(session, is_main_view, parent),
 128         splitter_(new QSplitter()),
 129         segment_display_mode_(Trace::ShowLastSegmentOnly),
 130         segment_selectable_(false),
 131         scale_(1e-3),
 132         offset_(0),
 133         ruler_offset_(0),
 134         updating_scroll_(false),
 135         settings_restored_(false),
 136         header_was_shrunk_(false),
 137         sticky_scrolling_(false), // Default setting is set in MainWindow::setup_ui()
 138         always_zoom_to_fit_(false),
 139         tick_period_(0),
 140         tick_prefix_(pv::util::SIPrefix::yocto),
 141         tick_precision_(0),
 142         time_unit_(util::TimeUnit::Time),
 143         show_cursors_(false),
 144         cursors_(new CursorPair(*this)),
 145         next_flag_text_('A'),
 146         trigger_markers_(),
 147         hover_point_(-1, -1),
 148         scroll_needs_defaults_(true),
 149         saved_v_offset_(0),
 150         scale_at_acq_start_(0),
 151         offset_at_acq_start_(0),
 152         suppress_zoom_to_fit_after_acq_(false)
 153 {
 154         QVBoxLayout *root_layout = new QVBoxLayout(this);
 155         root_layout->setContentsMargins(0, 0, 0, 0);
 156         root_layout->addWidget(splitter_);
 157
 158         viewport_ = new Viewport(*this);
 159         scrollarea_ = new CustomScrollArea(splitter_);
 160         scrollarea_->setViewport(viewport_);
 161         scrollarea_->setFrameShape(QFrame::NoFrame);
 162
 163         ruler_ = new Ruler(*this);
 164
 165         header_ = new Header(*this);
 166         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 167
 168         // We put the header into a simple layout so that we can add the top margin,
 169         // allowing us to make it line up with the bottom of the ruler
 170         QWidget *header_container = new QWidget();
 171         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 172         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 173         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 174         header_layout->addWidget(header_);
 175
 176         // To let the ruler and scrollarea be on the same split pane, we need a layout
 177         QWidget *trace_container = new QWidget();
 178         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 179         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 180         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 181         trace_layout->setContentsMargins(0, 0, 0, 0);
 182         trace_layout->addWidget(ruler_);
 183         trace_layout->addWidget(scrollarea_);
 184
 185         splitter_->addWidget(header_container);
 186         splitter_->addWidget(trace_container);
 187         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 188         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 189         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 190         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 191         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 192         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 193
 194         viewport_->installEventFilter(this);
 195         ruler_->installEventFilter(this);
 196         header_->installEventFilter(this);
 197
 198         // Set up settings and event handlers
 199         GlobalSettings settings;
 200         coloured_bg_ = settings.value(GlobalSettings::Key_View_ColouredBG).toBool();
 201
 202         GlobalSettings::register_change_handler(GlobalSettings::Key_View_TriggerIsZeroTime,
 203                 bind(&View::on_settingViewTriggerIsZeroTime_changed, this, _1));
 204
 205         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 206                 this, SLOT(h_scroll_value_changed(int)));
 207         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 208                 this, SLOT(v_scroll_value_changed()));
 209
 210         connect(header_, SIGNAL(selection_changed()),
 211                 ruler_, SLOT(clear_selection()));
 212         connect(ruler_, SIGNAL(selection_changed()),
 213                 header_, SLOT(clear_selection()));
 214
 215         connect(header_, SIGNAL(selection_changed()),
 216                 this, SIGNAL(selection_changed()));
 217         connect(ruler_, SIGNAL(selection_changed()),
 218                 this, SIGNAL(selection_changed()));
 219
 220         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 221                 this, SLOT(on_splitter_moved()));
 222
 223         connect(&lazy_event_handler_, SIGNAL(timeout()),
 224                 this, SLOT(process_sticky_events()));
 225         lazy_event_handler_.setSingleShot(true);
 226
 227         // Trigger the initial event manually. The default device has signals
 228         // which were created before this object came into being
 229         signals_changed();
 230
 231         // make sure the transparent widgets are on the top
 232         ruler_->raise();
 233         header_->raise();
 234
 235         // Update the zoom state
 236         calculate_tick_spacing();
 237
 238         // Make sure the standard bar's segment selector is in sync
 239         set_segment_display_mode(segment_display_mode_);
 240 }
 241
 242 Session& View::session()
 243 {
 244         return session_;
 245 }
 246
 247 const Session& View::session() const
 248 {
 249         return session_;
 250 }
 251
 252 unordered_set< shared_ptr<Signal> > View::signals() const
 253 {
 254         return signals_;
 255 }
 256
 257 void View::clear_signals()
 258 {
 259         ViewBase::clear_signalbases();
 260         signals_.clear();
 261 }
 262
 263 void View::add_signal(const shared_ptr<Signal> signal)
 264 {
 265         ViewBase::add_signalbase(signal->base());
 266         signals_.insert(signal);
 267
 268         signal->set_segment_display_mode(segment_display_mode_);
 269         signal->set_current_segment(current_segment_);
 270
 271         connect(signal->base().get(), SIGNAL(name_changed(const QString&)),
 272                 this, SLOT(on_signal_name_changed()));
 273 }
 274
 275 #ifdef ENABLE_DECODE
 276 void View::clear_decode_signals()
 277 {
 278         decode_traces_.clear();
 279 }
 280
 281 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 282 {
 283         shared_ptr<DecodeTrace> d(
 284                 new DecodeTrace(session_, signal, decode_traces_.size()));
 285         decode_traces_.push_back(d);
 286
 287         d->set_segment_display_mode(segment_display_mode_);
 288         d->set_current_segment(current_segment_);
 289
 290         connect(signal.get(), SIGNAL(name_changed(const QString&)),
 291                 this, SLOT(on_signal_name_changed()));
 292 }
 293
 294 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 295 {
 296         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 297                 if ((*i)->base() == signal) {
 298                         decode_traces_.erase(i);
 299                         signals_changed();
 300                         return;
 301                 }
 302 }
 303 #endif
 304
 305 View* View::view()
 306 {
 307         return this;
 308 }
 309
 310 const View* View::view() const
 311 {
 312         return this;
 313 }
 314
 315 Viewport* View::viewport()
 316 {
 317         return viewport_;
 318 }
 319
 320 const Viewport* View::viewport() const
 321 {
 322         return viewport_;
 323 }
 324
 325 void View::save_settings(QSettings &settings) const
 326 {
 327         settings.setValue("scale", scale_);
 328         settings.setValue("v_offset",
 329                 scrollarea_->verticalScrollBar()->sliderPosition());
 330
 331         settings.setValue("splitter_state", splitter_->saveState());
 332         settings.setValue("segment_display_mode", segment_display_mode_);
 333
 334         {
 335                 stringstream ss;
 336                 boost::archive::text_oarchive oa(ss);
 337                 oa << boost::serialization::make_nvp("ruler_shift", ruler_shift_);
 338                 settings.setValue("ruler_shift", QString::fromStdString(ss.str()));
 339         }
 340         {
 341                 stringstream ss;
 342                 boost::archive::text_oarchive oa(ss);
 343                 oa << boost::serialization::make_nvp("offset", offset_);
 344                 settings.setValue("offset", QString::fromStdString(ss.str()));
 345         }
 346
 347         for (shared_ptr<Signal> signal : signals_) {
 348                 settings.beginGroup(signal->base()->internal_name());
 349                 signal->save_settings(settings);
 350                 settings.endGroup();
 351         }
 352 }
 353
 354 void View::restore_settings(QSettings &settings)
 355 {
 356         // Note: It is assumed that this function is only called once,
 357         // immediately after restoring a previous session.
 358
 359         if (settings.contains("scale"))
 360                 set_scale(settings.value("scale").toDouble());
 361
 362         if (settings.contains("ruler_shift")) {
 363                 util::Timestamp shift;
 364                 stringstream ss;
 365                 ss << settings.value("ruler_shift").toString().toStdString();
 366
 367                 boost::archive::text_iarchive ia(ss);
 368                 ia >> boost::serialization::make_nvp("ruler_shift", shift);
 369
 370                 ruler_shift_ = shift;
 371         }
 372
 373         if (settings.contains("offset")) {
 374                 util::Timestamp offset;
 375                 stringstream ss;
 376                 ss << settings.value("offset").toString().toStdString();
 377
 378                 boost::archive::text_iarchive ia(ss);
 379                 ia >> boost::serialization::make_nvp("offset", offset);
 380
 381                 // This also updates ruler_offset_
 382                 set_offset(offset);
 383         }
 384
 385         if (settings.contains("splitter_state"))
 386                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 387
 388         if (settings.contains("segment_display_mode"))
 389                 set_segment_display_mode(
 390                         (Trace::SegmentDisplayMode)(settings.value("segment_display_mode").toInt()));
 391
 392         for (shared_ptr<Signal> signal : signals_) {
 393                 settings.beginGroup(signal->base()->internal_name());
 394                 signal->restore_settings(settings);
 395                 settings.endGroup();
 396         }
 397
 398         if (settings.contains("v_offset")) {
 399                 saved_v_offset_ = settings.value("v_offset").toInt();
 400                 set_v_offset(saved_v_offset_);
 401                 scroll_needs_defaults_ = false;
 402                 // Note: see eventFilter() for additional information
 403         }
 404
 405         settings_restored_ = true;
 406         suppress_zoom_to_fit_after_acq_ = true;
 407
 408         // Update the ruler so that it uses the new scale
 409         calculate_tick_spacing();
 410 }
 411
 412 vector< shared_ptr<TimeItem> > View::time_items() const
 413 {
 414         const vector<shared_ptr<Flag>> f(flags());
 415         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 416         items.push_back(cursors_);
 417         items.push_back(cursors_->first());
 418         items.push_back(cursors_->second());
 419
 420         for (auto trigger_marker : trigger_markers_)
 421                 items.push_back(trigger_marker);
 422
 423         return items;
 424 }
 425
 426 double View::scale() const
 427 {
 428         return scale_;
 429 }
 430
 431 void View::set_scale(double scale)
 432 {
 433         if (scale_ != scale) {
 434                 scale_ = scale;
 435                 scale_changed();
 436         }
 437 }
 438
 439 void View::set_offset(const pv::util::Timestamp& offset, bool force_update)
 440 {
 441         if ((offset_ != offset) || force_update) {
 442                 offset_ = offset;
 443                 ruler_offset_ = offset_ + ruler_shift_;
 444                 offset_changed();
 445         }
 446 }
 447
 448 const Timestamp& View::offset() const
 449 {
 450         return offset_;
 451 }
 452
 453 const Timestamp& View::ruler_offset() const
 454 {
 455         return ruler_offset_;
 456 }
 457
 458 void View::set_zero_position(pv::util::Timestamp& position)
 459 {
 460         ruler_shift_ = -position;
 461
 462         // Force an immediate update of the offsets
 463         set_offset(offset_, true);
 464         ruler_->update();
 465 }
 466
 467 void View::reset_zero_position()
 468 {
 469         ruler_shift_ = 0;
 470
 471         // Force an immediate update of the offsets
 472         set_offset(offset_, true);
 473         ruler_->update();
 474 }
 475
 476 int View::owner_visual_v_offset() const
 477 {
 478         return -scrollarea_->verticalScrollBar()->sliderPosition();
 479 }
 480
 481 void View::set_v_offset(int offset)
 482 {
 483         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 484         header_->update();
 485         viewport_->update();
 486 }
 487
 488 unsigned int View::depth() const
 489 {
 490         return 0;
 491 }
 492
 493 uint32_t View::current_segment() const
 494 {
 495         return current_segment_;
 496 }
 497
 498 pv::util::SIPrefix View::tick_prefix() const
 499 {
 500         return tick_prefix_;
 501 }
 502
 503 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 504 {
 505         if (tick_prefix_ != tick_prefix) {
 506                 tick_prefix_ = tick_prefix;
 507                 tick_prefix_changed();
 508         }
 509 }
 510
 511 unsigned int View::tick_precision() const
 512 {
 513         return tick_precision_;
 514 }
 515
 516 void View::set_tick_precision(unsigned tick_precision)
 517 {
 518         if (tick_precision_ != tick_precision) {
 519                 tick_precision_ = tick_precision;
 520                 tick_precision_changed();
 521         }
 522 }
 523
 524 const pv::util::Timestamp& View::tick_period() const
 525 {
 526         return tick_period_;
 527 }
 528
 529 unsigned int View::minor_tick_count() const
 530 {
 531         return minor_tick_count_;
 532 }
 533
 534 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 535 {
 536         if (tick_period_ != tick_period) {
 537                 tick_period_ = tick_period;
 538                 tick_period_changed();
 539         }
 540 }
 541
 542 TimeUnit View::time_unit() const
 543 {
 544         return time_unit_;
 545 }
 546
 547 void View::set_time_unit(pv::util::TimeUnit time_unit)
 548 {
 549         if (time_unit_ != time_unit) {
 550                 time_unit_ = time_unit;
 551                 time_unit_changed();
 552         }
 553 }
 554
 555 void View::set_current_segment(uint32_t segment_id)
 556 {
 557         current_segment_ = segment_id;
 558
 559         for (shared_ptr<Signal> signal : signals_)
 560                 signal->set_current_segment(current_segment_);
 561         for (shared_ptr<DecodeTrace> dt : decode_traces_)
 562                 dt->set_current_segment(current_segment_);
 563
 564         vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
 565
 566         trigger_markers_.clear();
 567         for (util::Timestamp timestamp : triggers)
 568                 trigger_markers_.push_back(make_shared<TriggerMarker>(*this, timestamp));
 569
 570         // When enabled, the first trigger for this segment is used as the zero position
 571         GlobalSettings settings;
 572         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 573
 574         if (trigger_is_zero_time && (triggers.size() > 0))
 575                 set_zero_position(triggers.front());
 576
 577         viewport_->update();
 578
 579         segment_changed(segment_id);
 580 }
 581
 582 bool View::segment_is_selectable() const
 583 {
 584         return segment_selectable_;
 585 }
 586
 587 Trace::SegmentDisplayMode View::segment_display_mode() const
 588 {
 589         return segment_display_mode_;
 590 }
 591
 592 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 593 {
 594         trigger_markers_.clear();
 595
 596         segment_display_mode_ = mode;
 597
 598         for (shared_ptr<Signal> signal : signals_)
 599                 signal->set_segment_display_mode(mode);
 600
 601         uint32_t last_segment = session_.get_segment_count() - 1;
 602
 603         switch (mode) {
 604         case Trace::ShowLastSegmentOnly:
 605                 if (current_segment_ != last_segment)
 606                         set_current_segment(last_segment);
 607                 break;
 608
 609         case Trace::ShowLastCompleteSegmentOnly:
 610                 // Do nothing if we only have one segment so far
 611                 if (last_segment > 0) {
 612                         // If the last segment isn't complete, the previous one must be
 613                         uint32_t segment_id =
 614                                 (session_.all_segments_complete(last_segment)) ?
 615                                 last_segment : last_segment - 1;
 616
 617                         if (current_segment_ != segment_id)
 618                                 set_current_segment(segment_id);
 619                 }
 620                 break;
 621
 622         case Trace::ShowSingleSegmentOnly:
 623         case Trace::ShowAllSegments:
 624         case Trace::ShowAccumulatedIntensity:
 625         default:
 626                 // Current segment remains as-is
 627                 break;
 628         }
 629
 630         segment_selectable_ = true;
 631
 632         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 633                 segment_selectable_ = false;
 634
 635         viewport_->update();
 636
 637         segment_display_mode_changed((int)mode, segment_selectable_);
 638 }
 639
 640 void View::zoom(double steps)
 641 {
 642         zoom(steps, viewport_->width() / 2);
 643 }
 644
 645 void View::zoom(double steps, int offset)
 646 {
 647         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 648 }
 649
 650 void View::zoom_fit(bool gui_state)
 651 {
 652         // Act as one-shot when stopped, toggle along with the GUI otherwise
 653         if (session_.get_capture_state() == Session::Stopped) {
 654                 always_zoom_to_fit_ = false;
 655                 always_zoom_to_fit_changed(false);
 656         } else {
 657                 always_zoom_to_fit_ = gui_state;
 658                 always_zoom_to_fit_changed(gui_state);
 659         }
 660
 661         const pair<Timestamp, Timestamp> extents = get_time_extents();
 662         const Timestamp delta = extents.second - extents.first;
 663         if (delta < Timestamp("1e-12"))
 664                 return;
 665
 666         assert(viewport_);
 667         const int w = viewport_->width();
 668         if (w <= 0)
 669                 return;
 670
 671         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 672         set_scale_offset(scale.convert_to<double>(), extents.first);
 673 }
 674
 675 void View::zoom_one_to_one()
 676 {
 677         using pv::data::SignalData;
 678
 679         // Make a set of all the visible data objects
 680         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 681         if (visible_data.empty())
 682                 return;
 683
 684         assert(viewport_);
 685         const int w = viewport_->width();
 686         if (w <= 0)
 687                 return;
 688
 689         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 690 }
 691
 692 void View::set_scale_offset(double scale, const Timestamp& offset)
 693 {
 694         // Disable sticky scrolling / always zoom to fit when acquisition runs
 695         // and user drags the viewport
 696         if ((scale_ == scale) && (offset_ != offset) &&
 697                         (session_.get_capture_state() == Session::Running)) {
 698
 699                 if (sticky_scrolling_) {
 700                         sticky_scrolling_ = false;
 701                         sticky_scrolling_changed(false);
 702                 }
 703
 704                 if (always_zoom_to_fit_) {
 705                         always_zoom_to_fit_ = false;
 706                         always_zoom_to_fit_changed(false);
 707                 }
 708         }
 709
 710         set_scale(scale);
 711         set_offset(offset);
 712
 713         calculate_tick_spacing();
 714
 715         update_scroll();
 716         ruler_->update();
 717         viewport_->update();
 718 }
 719
 720 set< shared_ptr<SignalData> > View::get_visible_data() const
 721 {
 722         // Make a set of all the visible data objects
 723         set< shared_ptr<SignalData> > visible_data;
 724         for (const shared_ptr<Signal> sig : signals_)
 725                 if (sig->enabled())
 726                         visible_data.insert(sig->data());
 727
 728         return visible_data;
 729 }
 730
 731 pair<Timestamp, Timestamp> View::get_time_extents() const
 732 {
 733         boost::optional<Timestamp> left_time, right_time;
 734         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 735         for (const shared_ptr<SignalData> d : visible_data) {
 736                 const vector< shared_ptr<Segment> > segments = d->segments();
 737                 for (const shared_ptr<Segment> &s : segments) {
 738                         double samplerate = s->samplerate();
 739                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 740
 741                         const Timestamp start_time = s->start_time();
 742                         left_time = left_time ?
 743                                 min(*left_time, start_time) :
 744                                                 start_time;
 745                         right_time = right_time ?
 746                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 747                                                  start_time + d->max_sample_count() / samplerate;
 748                 }
 749         }
 750
 751         if (!left_time || !right_time)
 752                 return make_pair(0, 0);
 753
 754         assert(*left_time < *right_time);
 755         return make_pair(*left_time, *right_time);
 756 }
 757
 758 void View::enable_show_sampling_points(bool state)
 759 {
 760         (void)state;
 761
 762         viewport_->update();
 763 }
 764
 765 void View::enable_show_analog_minor_grid(bool state)
 766 {
 767         (void)state;
 768
 769         viewport_->update();
 770 }
 771
 772 void View::enable_coloured_bg(bool state)
 773 {
 774         coloured_bg_ = state;
 775         viewport_->update();
 776 }
 777
 778 bool View::coloured_bg() const
 779 {
 780         return coloured_bg_;
 781 }
 782
 783 bool View::cursors_shown() const
 784 {
 785         return show_cursors_;
 786 }
 787
 788 void View::show_cursors(bool show)
 789 {
 790         show_cursors_ = show;
 791         ruler_->update();
 792         viewport_->update();
 793 }
 794
 795 void View::centre_cursors()
 796 {
 797         const double time_width = scale_ * viewport_->width();
 798         cursors_->first()->set_time(offset_ + time_width * 0.4);
 799         cursors_->second()->set_time(offset_ + time_width * 0.6);
 800         ruler_->update();
 801         viewport_->update();
 802 }
 803
 804 shared_ptr<CursorPair> View::cursors() const
 805 {
 806         return cursors_;
 807 }
 808
 809 void View::add_flag(const Timestamp& time)
 810 {
 811         flags_.push_back(make_shared<Flag>(*this, time,
 812                 QString("%1").arg(next_flag_text_)));
 813
 814         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 815                 (next_flag_text_ + 1);
 816
 817         time_item_appearance_changed(true, true);
 818 }
 819
 820 void View::remove_flag(shared_ptr<Flag> flag)
 821 {
 822         flags_.remove(flag);
 823         time_item_appearance_changed(true, true);
 824 }
 825
 826 vector< shared_ptr<Flag> > View::flags() const
 827 {
 828         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 829         stable_sort(flags.begin(), flags.end(),
 830                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 831                         return a->time() < b->time();
 832                 });
 833
 834         return flags;
 835 }
 836
 837 const QPoint& View::hover_point() const
 838 {
 839         return hover_point_;
 840 }
 841
 842 void View::restack_all_trace_tree_items()
 843 {
 844         // Make a list of owners that is sorted from deepest first
 845         const vector<shared_ptr<TraceTreeItem>> items(
 846                 list_by_type<TraceTreeItem>());
 847         set< TraceTreeItemOwner* > owners;
 848         for (const auto &r : items)
 849                 owners.insert(r->owner());
 850         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 851         sort(sorted_owners.begin(), sorted_owners.end(),
 852                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 853                         return a->depth() > b->depth(); });
 854
 855         // Restack the items recursively
 856         for (auto &o : sorted_owners)
 857                 o->restack_items();
 858
 859         // Animate the items to their destination
 860         for (const auto &i : items)
 861                 i->animate_to_layout_v_offset();
 862 }
 863
 864 void View::trigger_event(int segment_id, util::Timestamp location)
 865 {
 866         // TODO This doesn't work if we're showing multiple segments at once
 867         if ((uint32_t)segment_id != current_segment_)
 868                 return;
 869
 870         // Set zero location if the Key_View_TriggerIsZeroTime setting is set and
 871         // if this is the first trigger for this segment.
 872         GlobalSettings settings;
 873         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 874
 875         size_t trigger_count = session_.get_triggers(current_segment_).size();
 876
 877         if (trigger_is_zero_time && trigger_count == 1)
 878                 set_zero_position(location);
 879
 880         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 881 }
 882
 883 void View::get_scroll_layout(double &length, Timestamp &offset) const
 884 {
 885         const pair<Timestamp, Timestamp> extents = get_time_extents();
 886         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 887         offset = offset_ / scale_;
 888 }
 889
 890 void View::set_zoom(double scale, int offset)
 891 {
 892         // Reset the "always zoom to fit" feature as the user changed the zoom
 893         always_zoom_to_fit_ = false;
 894         always_zoom_to_fit_changed(false);
 895
 896         const Timestamp cursor_offset = offset_ + scale_ * offset;
 897         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 898         const Timestamp new_offset = cursor_offset - new_scale * offset;
 899         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 900 }
 901
 902 void View::calculate_tick_spacing()
 903 {
 904         const double SpacingIncrement = 10.0f;
 905         const double MinValueSpacing = 40.0f;
 906
 907         // Figure out the highest numeric value visible on a label
 908         const QSize areaSize = viewport_->size();
 909         const Timestamp max_time = max(fabs(offset_),
 910                 fabs(offset_ + scale_ * areaSize.width()));
 911
 912         double min_width = SpacingIncrement;
 913         double label_width, tick_period_width;
 914
 915         QFontMetrics m(QApplication::font());
 916
 917         // Copies of the member variables with the same name, used in the calculation
 918         // and written back afterwards, so that we don't emit signals all the time
 919         // during the calculation.
 920         pv::util::Timestamp tick_period = tick_period_;
 921         pv::util::SIPrefix tick_prefix = tick_prefix_;
 922         unsigned tick_precision = tick_precision_;
 923
 924         do {
 925                 const double min_period = scale_ * min_width;
 926
 927                 const int order = (int)floorf(log10f(min_period));
 928                 const pv::util::Timestamp order_decimal =
 929                         pow(pv::util::Timestamp(10), order);
 930
 931                 // Allow for a margin of error so that a scale unit of 1 can be used.
 932                 // Otherwise, for a SU of 1 the tick period will almost always be below
 933                 // the min_period by a small amount - and thus skipped in favor of 2.
 934                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 935                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 936                 double tp_with_margin;
 937                 unsigned int unit = 0;
 938
 939                 do {
 940                         tp_with_margin = order_decimal.convert_to<double>() *
 941                                 (ScaleUnits[unit++] + tp_margin);
 942                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 943
 944                 minor_tick_count_ = (unit == 2) ? (4) : (5);
 945                 tick_period = order_decimal * ScaleUnits[unit - 1];
 946                 tick_prefix = static_cast<pv::util::SIPrefix>(
 947                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 948
 949                 // Precision is the number of fractional digits required, not
 950                 // taking the prefix into account (and it must never be negative)
 951                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 952
 953                 tick_period_width = (tick_period / scale_).convert_to<double>();
 954
 955                 const QString label_text = Ruler::format_time_with_distance(
 956                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 957
 958                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 959                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 960                                 MinValueSpacing;
 961
 962                 min_width += SpacingIncrement;
 963         } while (tick_period_width < label_width);
 964
 965         set_tick_period(tick_period);
 966         set_tick_prefix(tick_prefix);
 967         set_tick_precision(tick_precision);
 968 }
 969
 970 void View::adjust_top_margin()
 971 {
 972         assert(viewport_);
 973
 974         const QSize areaSize = viewport_->size();
 975
 976         const pair<int, int> extents = v_extents();
 977         const int top_margin = owner_visual_v_offset() + extents.first;
 978         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
 979
 980         // Do we have empty space at the top while the last trace goes out of screen?
 981         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
 982                 const int trace_height = extents.second - extents.first;
 983
 984                 // Center everything vertically if there is enough space
 985                 if (areaSize.height() >= trace_height)
 986                         set_v_offset(extents.first -
 987                                 ((areaSize.height() - trace_height) / 2));
 988                 else
 989                         // Remove the top margin to make as many traces fit on screen as possible
 990                         set_v_offset(extents.first);
 991         }
 992 }
 993
 994 void View::update_scroll()
 995 {
 996         assert(viewport_);
 997         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
 998         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
 999
1000         const QSize areaSize = viewport_->size();
1001
1002         // Set the horizontal scroll bar
1003         double length = 0;
1004         Timestamp offset;
1005         get_scroll_layout(length, offset);
1006         length = max(length - areaSize.width(), 0.0);
1007
1008         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
1009
1010         hscrollbar->setPageStep(areaSize.width() / 2);
1011         hscrollbar->setSingleStep(major_tick_distance);
1012
1013         updating_scroll_ = true;
1014
1015         if (length < MaxScrollValue) {
1016                 hscrollbar->setRange(0, length);
1017                 hscrollbar->setSliderPosition(offset.convert_to<double>());
1018         } else {
1019                 hscrollbar->setRange(0, MaxScrollValue);
1020                 hscrollbar->setSliderPosition(
1021                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
1022         }
1023
1024         updating_scroll_ = false;
1025
1026         // Set the vertical scrollbar
1027         vscrollbar->setPageStep(areaSize.height());
1028         vscrollbar->setSingleStep(areaSize.height() / 8);
1029
1030         const pair<int, int> extents = v_extents();
1031
1032         // Don't change the scrollbar range if there are no traces
1033         if (extents.first != extents.second)
1034                 vscrollbar->setRange(extents.first - areaSize.height(),
1035                         extents.second);
1036
1037         if (scroll_needs_defaults_)
1038                 set_scroll_default();
1039 }
1040
1041 void View::reset_scroll()
1042 {
1043         scrollarea_->verticalScrollBar()->setRange(0, 0);
1044 }
1045
1046 void View::set_scroll_default()
1047 {
1048         assert(viewport_);
1049
1050         const QSize areaSize = viewport_->size();
1051
1052         const pair<int, int> extents = v_extents();
1053         const int trace_height = extents.second - extents.first;
1054
1055         // Do all traces fit in the view?
1056         if (areaSize.height() >= trace_height)
1057                 // Center all traces vertically
1058                 set_v_offset(extents.first -
1059                         ((areaSize.height() - trace_height) / 2));
1060         else
1061                 // Put the first trace at the top, letting the bottom ones overflow
1062                 set_v_offset(extents.first);
1063 }
1064
1065 void View::determine_if_header_was_shrunk()
1066 {
1067         const int header_pane_width = splitter_->sizes().front();
1068         const int header_width = header_->extended_size_hint().width();
1069
1070         // Allow for a slight margin of error so that we also accept
1071         // slight differences when e.g. a label name change increased
1072         // the overall width
1073         header_was_shrunk_ = (header_pane_width < (header_width - 10));
1074 }
1075
1076 void View::resize_header_to_fit()
1077 {
1078         // Setting the maximum width of the header widget doesn't work as
1079         // expected because the splitter would allow the user to make the
1080         // pane wider than that, creating empty space as a result.
1081         // To make this work, we stricly enforce the maximum width by
1082         // expanding the header unless the user shrunk it on purpose.
1083         // As we're then setting the width of the header pane, we set the
1084         // splitter to the maximum allowed position.
1085
1086         int splitter_area_width = 0;
1087         for (int w : splitter_->sizes())
1088                 splitter_area_width += w;
1089
1090         // Make sure the header has enough horizontal space to show all labels fully
1091         QList<int> pane_sizes;
1092         pane_sizes.push_back(header_->extended_size_hint().width());
1093         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1094         splitter_->setSizes(pane_sizes);
1095 }
1096
1097 void View::update_layout()
1098 {
1099         update_scroll();
1100 }
1101
1102 TraceTreeItemOwner* View::find_prevalent_trace_group(
1103         const shared_ptr<sigrok::ChannelGroup> &group,
1104         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1105                 &signal_map)
1106 {
1107         assert(group);
1108
1109         unordered_set<TraceTreeItemOwner*> owners;
1110         vector<TraceTreeItemOwner*> owner_list;
1111
1112         // Make a set and a list of all the owners
1113         for (const auto &channel : group->channels()) {
1114                 for (auto entry : signal_map) {
1115                         if (entry.first->channel() == channel) {
1116                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1117                                 owner_list.push_back(o);
1118                                 owners.insert(o);
1119                         }
1120                 }
1121         }
1122
1123         // Iterate through the list of owners, and find the most prevalent
1124         size_t max_prevalence = 0;
1125         TraceTreeItemOwner *prevalent_owner = nullptr;
1126         for (TraceTreeItemOwner *owner : owners) {
1127                 const size_t prevalence = count_if(
1128                         owner_list.begin(), owner_list.end(),
1129                         [&](TraceTreeItemOwner *o) { return o == owner; });
1130                 if (prevalence > max_prevalence) {
1131                         max_prevalence = prevalence;
1132                         prevalent_owner = owner;
1133                 }
1134         }
1135
1136         return prevalent_owner;
1137 }
1138
1139 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1140         const vector< shared_ptr<sigrok::Channel> > &channels,
1141         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1142                 &signal_map,
1143         set< shared_ptr<Trace> > &add_list)
1144 {
1145         vector< shared_ptr<Trace> > filtered_traces;
1146
1147         for (const auto &channel : channels) {
1148                 for (auto entry : signal_map) {
1149                         if (entry.first->channel() == channel) {
1150                                 shared_ptr<Trace> trace = entry.second;
1151                                 const auto list_iter = add_list.find(trace);
1152                                 if (list_iter == add_list.end())
1153                                         continue;
1154
1155                                 filtered_traces.push_back(trace);
1156                                 add_list.erase(list_iter);
1157                         }
1158                 }
1159         }
1160
1161         return filtered_traces;
1162 }
1163
1164 void View::determine_time_unit()
1165 {
1166         // Check whether we know the sample rate and hence can use time as the unit
1167         if (time_unit_ == util::TimeUnit::Samples) {
1168                 // Check all signals but...
1169                 for (const shared_ptr<Signal> signal : signals_) {
1170                         const shared_ptr<SignalData> data = signal->data();
1171
1172                         // ...only check first segment of each
1173                         const vector< shared_ptr<Segment> > segments = data->segments();
1174                         if (!segments.empty())
1175                                 if (segments[0]->samplerate()) {
1176                                         set_time_unit(util::TimeUnit::Time);
1177                                         break;
1178                                 }
1179                 }
1180         }
1181 }
1182
1183 bool View::eventFilter(QObject *object, QEvent *event)
1184 {
1185         const QEvent::Type type = event->type();
1186         if (type == QEvent::MouseMove) {
1187
1188                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1189                 if (object == viewport_)
1190                         hover_point_ = mouse_event->pos();
1191                 else if (object == ruler_)
1192                         hover_point_ = QPoint(mouse_event->x(), 0);
1193                 else if (object == header_)
1194                         hover_point_ = QPoint(0, mouse_event->y());
1195                 else
1196                         hover_point_ = QPoint(-1, -1);
1197
1198                 update_hover_point();
1199
1200         } else if (type == QEvent::Leave) {
1201                 hover_point_ = QPoint(-1, -1);
1202                 update_hover_point();
1203         } else if (type == QEvent::Show) {
1204
1205                 // This is somewhat of a hack, unfortunately. We cannot use
1206                 // set_v_offset() from within restore_settings() as the view
1207                 // at that point is neither visible nor properly sized.
1208                 // This is the least intrusive workaround I could come up
1209                 // with: set the vertical offset (or scroll defaults) when
1210                 // the view is shown, which happens after all widgets were
1211                 // resized to their final sizes.
1212                 update_layout();
1213
1214                 if (settings_restored_)
1215                         determine_if_header_was_shrunk();
1216                 else
1217                         resize_header_to_fit();
1218
1219                 if (scroll_needs_defaults_) {
1220                         set_scroll_default();
1221                         scroll_needs_defaults_ = false;
1222                 }
1223
1224                 if (saved_v_offset_) {
1225                         set_v_offset(saved_v_offset_);
1226                         saved_v_offset_ = 0;
1227                 }
1228         }
1229
1230         return QObject::eventFilter(object, event);
1231 }
1232
1233 void View::resizeEvent(QResizeEvent* event)
1234 {
1235         // Only adjust the top margin if we shrunk vertically
1236         if (event->size().height() < event->oldSize().height())
1237                 adjust_top_margin();
1238
1239         update_layout();
1240 }
1241
1242 void View::update_hover_point()
1243 {
1244         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1245                 list_by_type<TraceTreeItem>());
1246         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1247                 r->hover_point_changed(hover_point_);
1248
1249         hover_point_changed(hover_point_);
1250 }
1251
1252 void View::row_item_appearance_changed(bool label, bool content)
1253 {
1254         if (label)
1255                 header_->update();
1256         if (content)
1257                 viewport_->update();
1258 }
1259
1260 void View::time_item_appearance_changed(bool label, bool content)
1261 {
1262         if (label) {
1263                 ruler_->update();
1264
1265                 // Make sure the header pane width is updated, too
1266                 update_layout();
1267         }
1268
1269         if (content)
1270                 viewport_->update();
1271 }
1272
1273 void View::extents_changed(bool horz, bool vert)
1274 {
1275         sticky_events_ |=
1276                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1277                 (vert ? TraceTreeItemVExtentsChanged : 0);
1278
1279         lazy_event_handler_.start();
1280 }
1281
1282 void View::on_signal_name_changed()
1283 {
1284         if (!header_was_shrunk_)
1285                 resize_header_to_fit();
1286 }
1287
1288 void View::on_splitter_moved()
1289 {
1290         // The header can only shrink when the splitter is moved manually
1291         determine_if_header_was_shrunk();
1292
1293         if (!header_was_shrunk_)
1294                 resize_header_to_fit();
1295 }
1296
1297 void View::h_scroll_value_changed(int value)
1298 {
1299         if (updating_scroll_)
1300                 return;
1301
1302         // Disable sticky scrolling when user moves the horizontal scroll bar
1303         // during a running acquisition
1304         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1305                 sticky_scrolling_ = false;
1306                 sticky_scrolling_changed(false);
1307         }
1308
1309         const int range = scrollarea_->horizontalScrollBar()->maximum();
1310         if (range < MaxScrollValue)
1311                 set_offset(scale_ * value);
1312         else {
1313                 double length = 0;
1314                 Timestamp offset;
1315                 get_scroll_layout(length, offset);
1316                 set_offset(scale_ * length * value / MaxScrollValue);
1317         }
1318
1319         ruler_->update();
1320         viewport_->update();
1321 }
1322
1323 void View::v_scroll_value_changed()
1324 {
1325         header_->update();
1326         viewport_->update();
1327 }
1328
1329 void View::signals_changed()
1330 {
1331         using sigrok::Channel;
1332
1333         vector< shared_ptr<Channel> > channels;
1334         shared_ptr<sigrok::Device> sr_dev;
1335         bool signals_added_or_removed = false;
1336
1337         // Do we need to set the vertical scrollbar to its default position later?
1338         // We do if there are no traces, i.e. the scroll bar has no range set
1339         bool reset_scrollbar =
1340                 (scrollarea_->verticalScrollBar()->minimum() ==
1341                         scrollarea_->verticalScrollBar()->maximum());
1342
1343         if (!session_.device()) {
1344                 reset_scroll();
1345                 signals_.clear();
1346         } else {
1347                 sr_dev = session_.device()->device();
1348                 assert(sr_dev);
1349                 channels = sr_dev->channels();
1350         }
1351
1352         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1353
1354         // Make a list of traces that are being added, and a list of traces
1355         // that are being removed
1356         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1357         const set<shared_ptr<Trace>> prev_traces(
1358                 prev_trace_list.begin(), prev_trace_list.end());
1359
1360         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1361
1362 #ifdef ENABLE_DECODE
1363         traces.insert(decode_traces_.begin(), decode_traces_.end());
1364 #endif
1365
1366         set< shared_ptr<Trace> > add_traces;
1367         set_difference(traces.begin(), traces.end(),
1368                 prev_traces.begin(), prev_traces.end(),
1369                 inserter(add_traces, add_traces.begin()));
1370
1371         set< shared_ptr<Trace> > remove_traces;
1372         set_difference(prev_traces.begin(), prev_traces.end(),
1373                 traces.begin(), traces.end(),
1374                 inserter(remove_traces, remove_traces.begin()));
1375
1376         // Make a look-up table of sigrok Channels to pulseview Signals
1377         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1378                 signal_map;
1379         for (const shared_ptr<Signal> &sig : signals_)
1380                 signal_map[sig->base()] = sig;
1381
1382         // Populate channel groups
1383         if (sr_dev)
1384                 for (auto entry : sr_dev->channel_groups()) {
1385                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1386
1387                         if (group->channels().size() <= 1)
1388                                 continue;
1389
1390                         // Find best trace group to add to
1391                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1392                                 group, signal_map);
1393
1394                         // If there is no trace group, create one
1395                         shared_ptr<TraceGroup> new_trace_group;
1396                         if (!owner) {
1397                                 new_trace_group.reset(new TraceGroup());
1398                                 owner = new_trace_group.get();
1399                         }
1400
1401                         // Extract traces for the trace group, removing them from
1402                         // the add list
1403                         const vector< shared_ptr<Trace> > new_traces_in_group =
1404                                 extract_new_traces_for_channels(group->channels(),
1405                                         signal_map, add_traces);
1406
1407                         // Add the traces to the group
1408                         const pair<int, int> prev_v_extents = owner->v_extents();
1409                         int offset = prev_v_extents.second - prev_v_extents.first;
1410                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1411                                 assert(trace);
1412                                 owner->add_child_item(trace);
1413
1414                                 const pair<int, int> extents = trace->v_extents();
1415                                 if (trace->enabled())
1416                                         offset += -extents.first;
1417                                 trace->force_to_v_offset(offset);
1418                                 if (trace->enabled())
1419                                         offset += extents.second;
1420                         }
1421
1422                         if (new_trace_group) {
1423                                 // Assign proper vertical offsets to each channel in the group
1424                                 new_trace_group->restack_items();
1425
1426                                 // If this is a new group, enqueue it in the new top level
1427                                 // items list
1428                                 if (!new_traces_in_group.empty())
1429                                         new_top_level_items.push_back(new_trace_group);
1430                         }
1431                 }
1432
1433         // Enqueue the remaining logic channels in a group
1434         vector< shared_ptr<Channel> > logic_channels;
1435         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1436                 [](const shared_ptr<Channel>& c) {
1437                         return c->type() == sigrok::ChannelType::LOGIC; });
1438
1439         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1440                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1441
1442         if (non_grouped_logic_signals.size() > 0) {
1443                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1444                         make_shared<TraceGroup>());
1445                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1446                         non_grouped_trace_group->add_child_item(trace);
1447
1448                 non_grouped_trace_group->restack_items();
1449                 new_top_level_items.push_back(non_grouped_trace_group);
1450         }
1451
1452         // Enqueue the remaining channels as free ungrouped traces
1453         const vector< shared_ptr<Trace> > new_top_level_signals =
1454                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1455         new_top_level_items.insert(new_top_level_items.end(),
1456                 new_top_level_signals.begin(), new_top_level_signals.end());
1457
1458         // Enqueue any remaining traces i.e. decode traces
1459         new_top_level_items.insert(new_top_level_items.end(),
1460                 add_traces.begin(), add_traces.end());
1461
1462         // Remove any removed traces
1463         for (shared_ptr<Trace> trace : remove_traces) {
1464                 TraceTreeItemOwner *const owner = trace->owner();
1465                 assert(owner);
1466                 owner->remove_child_item(trace);
1467                 signals_added_or_removed = true;
1468         }
1469
1470         // Remove any empty trace groups
1471         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1472                 if (group->child_items().size() == 0) {
1473                         remove_child_item(group);
1474                         group.reset();
1475                 }
1476
1477         // Add and position the pending top levels items
1478         int offset = v_extents().second;
1479         for (auto item : new_top_level_items) {
1480                 add_child_item(item);
1481
1482                 // Position the item after the last item or at the top if there is none
1483                 const pair<int, int> extents = item->v_extents();
1484
1485                 if (item->enabled())
1486                         offset += -extents.first;
1487
1488                 item->force_to_v_offset(offset);
1489
1490                 if (item->enabled())
1491                         offset += extents.second;
1492                 signals_added_or_removed = true;
1493         }
1494
1495
1496         if (signals_added_or_removed && !header_was_shrunk_)
1497                 resize_header_to_fit();
1498
1499         update_layout();
1500
1501         header_->update();
1502         viewport_->update();
1503
1504         if (reset_scrollbar)
1505                 set_scroll_default();
1506 }
1507
1508 void View::capture_state_updated(int state)
1509 {
1510         GlobalSettings settings;
1511
1512         if (state == Session::Running) {
1513                 set_time_unit(util::TimeUnit::Samples);
1514
1515                 trigger_markers_.clear();
1516
1517                 scale_at_acq_start_ = scale_;
1518                 offset_at_acq_start_ = offset_;
1519
1520                 // Activate "always zoom to fit" if the setting is enabled and we're
1521                 // the main view of this session (other trace views may be used for
1522                 // zooming and we don't want to mess them up)
1523                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1524                 if (is_main_view_ && state) {
1525                         always_zoom_to_fit_ = true;
1526                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1527                 }
1528
1529                 // Enable sticky scrolling if the setting is enabled
1530                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1531
1532                 // Reset all traces to segment 0
1533                 current_segment_ = 0;
1534                 set_current_segment(current_segment_);
1535         }
1536
1537         if (state == Session::Stopped) {
1538                 // After acquisition has stopped we need to re-calculate the ticks once
1539                 // as it's otherwise done when the user pans or zooms, which is too late
1540                 calculate_tick_spacing();
1541
1542                 // Reset "always zoom to fit", the acquisition has stopped
1543                 if (always_zoom_to_fit_) {
1544                         // Perform a final zoom-to-fit before disabling
1545                         zoom_fit(always_zoom_to_fit_);
1546                         always_zoom_to_fit_ = false;
1547                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1548                 }
1549
1550                 bool zoom_to_fit_after_acq =
1551                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1552
1553                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1554                 // we didn't restore settings in the meanwhile
1555                 if (zoom_to_fit_after_acq &&
1556                         !suppress_zoom_to_fit_after_acq_ &&
1557                         (scale_ == scale_at_acq_start_) &&
1558                         (offset_ == offset_at_acq_start_))
1559                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1560
1561                 suppress_zoom_to_fit_after_acq_ = false;
1562         }
1563 }
1564
1565 void View::on_new_segment(int new_segment_id)
1566 {
1567         on_segment_changed(new_segment_id);
1568 }
1569
1570 void View::on_segment_completed(int segment_id)
1571 {
1572         on_segment_changed(segment_id);
1573 }
1574
1575 void View::on_segment_changed(int segment)
1576 {
1577         switch (segment_display_mode_) {
1578         case Trace::ShowLastSegmentOnly:
1579         case Trace::ShowSingleSegmentOnly:
1580                 set_current_segment(segment);
1581                 break;
1582
1583         case Trace::ShowLastCompleteSegmentOnly:
1584                 // Only update if all segments are complete
1585                 if (session_.all_segments_complete(segment))
1586                         set_current_segment(segment);
1587                 break;
1588
1589         case Trace::ShowAllSegments:
1590         case Trace::ShowAccumulatedIntensity:
1591         default:
1592                 break;
1593         }
1594 }
1595
1596 void View::on_settingViewTriggerIsZeroTime_changed(const QVariant new_value)
1597 {
1598         if (new_value.toBool()) {
1599                 // The first trigger for this segment is used as the zero position
1600                 vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
1601                 if (triggers.size() > 0)
1602                         set_zero_position(triggers.front());
1603         } else
1604                 reset_zero_position();
1605 }
1606
1607 void View::perform_delayed_view_update()
1608 {
1609         if (always_zoom_to_fit_) {
1610                 zoom_fit(true);
1611         } else if (sticky_scrolling_) {
1612                 // Make right side of the view sticky
1613                 double length = 0;
1614                 Timestamp offset;
1615                 get_scroll_layout(length, offset);
1616
1617                 const QSize areaSize = viewport_->size();
1618                 length = max(length - areaSize.width(), 0.0);
1619
1620                 set_offset(scale_ * length);
1621         }
1622
1623         determine_time_unit();
1624         update_scroll();
1625         ruler_->update();
1626         viewport_->update();
1627 }
1628
1629 void View::process_sticky_events()
1630 {
1631         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1632                 update_layout();
1633         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1634                 restack_all_trace_tree_items();
1635                 update_scroll();
1636         }
1637
1638         // Clear the sticky events
1639         sticky_events_ = 0;
1640 }
1641
1642 } // namespace trace
1643 } // namespace views
1644 } // namespace pv