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