pv/views/trace/view.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifdef ENABLE_DECODE
  21 #include <libsigrokdecode/libsigrokdecode.h>
  22 #endif
  23
  24 #include <extdef.h>
  25
  26 #include <algorithm>
  27 #include <cassert>
  28 #include <climits>
  29 #include <cmath>
  30 #include <iostream>
  31 #include <iterator>
  32 #include <unordered_set>
  33
  34 #include <boost/archive/text_iarchive.hpp>
  35 #include <boost/archive/text_oarchive.hpp>
  36 #include <boost/serialization/serialization.hpp>
  37
  38 #include <QApplication>
  39 #include <QEvent>
  40 #include <QFontMetrics>
  41 #include <QMouseEvent>
  42 #include <QScrollBar>
  43 #include <QVBoxLayout>
  44
  45 #include <libsigrokcxx/libsigrokcxx.hpp>
  46
  47 #include "analogsignal.hpp"
  48 #include "header.hpp"
  49 #include "logicsignal.hpp"
  50 #include "ruler.hpp"
  51 #include "signal.hpp"
  52 #include "tracegroup.hpp"
  53 #include "triggermarker.hpp"
  54 #include "view.hpp"
  55 #include "viewport.hpp"
  56
  57 #include "pv/data/logic.hpp"
  58 #include "pv/data/logicsegment.hpp"
  59 #include "pv/devices/device.hpp"
  60 #include "pv/globalsettings.hpp"
  61 #include "pv/session.hpp"
  62 #include "pv/util.hpp"
  63
  64 #ifdef ENABLE_DECODE
  65 #include "decodetrace.hpp"
  66 #endif
  67
  68 using pv::data::SignalData;
  69 using pv::data::Segment;
  70 using pv::util::TimeUnit;
  71 using pv::util::Timestamp;
  72
  73 using std::back_inserter;
  74 using std::copy_if;
  75 using std::count_if;
  76 using std::inserter;
  77 using std::max;
  78 using std::make_pair;
  79 using std::make_shared;
  80 using std::min;
  81 using std::pair;
  82 using std::set;
  83 using std::set_difference;
  84 using std::shared_ptr;
  85 using std::stringstream;
  86 using std::unordered_map;
  87 using std::unordered_set;
  88 using std::vector;
  89
  90 namespace pv {
  91 namespace views {
  92 namespace trace {
  93
  94 const Timestamp View::MaxScale("1e9");
  95 const Timestamp View::MinScale("1e-12");
  96
  97 const int View::MaxScrollValue = INT_MAX / 2;
  98
  99 const int View::ScaleUnits[3] = {1, 2, 5};
 100
 101
 102 CustomScrollArea::CustomScrollArea(QWidget *parent) :
 103         QAbstractScrollArea(parent)
 104 {
 105 }
 106
 107 bool CustomScrollArea::viewportEvent(QEvent *event)
 108 {
 109         switch (event->type()) {
 110         case QEvent::Paint:
 111         case QEvent::MouseButtonPress:
 112         case QEvent::MouseButtonRelease:
 113         case QEvent::MouseButtonDblClick:
 114         case QEvent::MouseMove:
 115         case QEvent::Wheel:
 116         case QEvent::TouchBegin:
 117         case QEvent::TouchUpdate:
 118         case QEvent::TouchEnd:
 119                 return false;
 120         default:
 121                 return QAbstractScrollArea::viewportEvent(event);
 122         }
 123 }
 124
 125 View::View(Session &session, bool is_main_view, QWidget *parent) :
 126         ViewBase(session, is_main_view, parent),
 127         splitter_(new QSplitter()),
 128         segment_display_mode_(Trace::ShowLastSegmentOnly),
 129         segment_selectable_(false),
 130         scale_(1e-3),
 131         offset_(0),
 132         ruler_offset_(0),
 133         updating_scroll_(false),
 134         settings_restored_(false),
 135         header_was_shrunk_(false),
 136         sticky_scrolling_(false), // Default setting is set in MainWindow::setup_ui()
 137         always_zoom_to_fit_(false),
 138         tick_period_(0),
 139         tick_prefix_(pv::util::SIPrefix::yocto),
 140         tick_precision_(0),
 141         time_unit_(util::TimeUnit::Time),
 142         show_cursors_(false),
 143         cursors_(new CursorPair(*this)),
 144         next_flag_text_('A'),
 145         trigger_markers_(),
 146         hover_point_(-1, -1),
 147         scroll_needs_defaults_(true),
 148         saved_v_offset_(0),
 149         scale_at_acq_start_(0),
 150         offset_at_acq_start_(0),
 151         suppress_zoom_to_fit_after_acq_(false)
 152 {
 153         QVBoxLayout *root_layout = new QVBoxLayout(this);
 154         root_layout->setContentsMargins(0, 0, 0, 0);
 155         root_layout->addWidget(splitter_);
 156
 157         viewport_ = new Viewport(*this);
 158         scrollarea_ = new CustomScrollArea(splitter_);
 159         scrollarea_->setViewport(viewport_);
 160         scrollarea_->setFrameShape(QFrame::NoFrame);
 161
 162         ruler_ = new Ruler(*this);
 163
 164         header_ = new Header(*this);
 165         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 166
 167         // We put the header into a simple layout so that we can add the top margin,
 168         // allowing us to make it line up with the bottom of the ruler
 169         QWidget *header_container = new QWidget();
 170         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 171         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 172         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 173         header_layout->addWidget(header_);
 174
 175         // To let the ruler and scrollarea be on the same split pane, we need a layout
 176         QWidget *trace_container = new QWidget();
 177         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 178         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 179         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 180         trace_layout->setContentsMargins(0, 0, 0, 0);
 181         trace_layout->addWidget(ruler_);
 182         trace_layout->addWidget(scrollarea_);
 183
 184         splitter_->addWidget(header_container);
 185         splitter_->addWidget(trace_container);
 186         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 187         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 188         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 189         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 190         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 191         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 192
 193         viewport_->installEventFilter(this);
 194         ruler_->installEventFilter(this);
 195         header_->installEventFilter(this);
 196
 197         // Set up settings and event handlers
 198         GlobalSettings settings;
 199         coloured_bg_ = settings.value(GlobalSettings::Key_View_ColouredBG).toBool();
 200
 201         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 202                 this, SLOT(h_scroll_value_changed(int)));
 203         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 204                 this, SLOT(v_scroll_value_changed()));
 205
 206         connect(header_, SIGNAL(selection_changed()),
 207                 ruler_, SLOT(clear_selection()));
 208         connect(ruler_, SIGNAL(selection_changed()),
 209                 header_, SLOT(clear_selection()));
 210
 211         connect(header_, SIGNAL(selection_changed()),
 212                 this, SIGNAL(selection_changed()));
 213         connect(ruler_, SIGNAL(selection_changed()),
 214                 this, SIGNAL(selection_changed()));
 215
 216         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 217                 this, SLOT(on_splitter_moved()));
 218
 219         connect(&lazy_event_handler_, SIGNAL(timeout()),
 220                 this, SLOT(process_sticky_events()));
 221         lazy_event_handler_.setSingleShot(true);
 222
 223         // Trigger the initial event manually. The default device has signals
 224         // which were created before this object came into being
 225         signals_changed();
 226
 227         // make sure the transparent widgets are on the top
 228         ruler_->raise();
 229         header_->raise();
 230
 231         // Update the zoom state
 232         calculate_tick_spacing();
 233
 234         // Make sure the standard bar's segment selector is in sync
 235         set_segment_display_mode(segment_display_mode_);
 236 }
 237
 238 Session& View::session()
 239 {
 240         return session_;
 241 }
 242
 243 const Session& View::session() const
 244 {
 245         return session_;
 246 }
 247
 248 unordered_set< shared_ptr<Signal> > View::signals() const
 249 {
 250         return signals_;
 251 }
 252
 253 void View::clear_signals()
 254 {
 255         ViewBase::clear_signalbases();
 256         signals_.clear();
 257 }
 258
 259 void View::add_signal(const shared_ptr<Signal> signal)
 260 {
 261         ViewBase::add_signalbase(signal->base());
 262         signals_.insert(signal);
 263
 264         signal->set_segment_display_mode(segment_display_mode_);
 265         signal->set_current_segment(current_segment_);
 266
 267         connect(signal->base().get(), SIGNAL(name_changed(const QString&)),
 268                 this, SLOT(on_signal_name_changed()));
 269 }
 270
 271 #ifdef ENABLE_DECODE
 272 void View::clear_decode_signals()
 273 {
 274         decode_traces_.clear();
 275 }
 276
 277 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 278 {
 279         shared_ptr<DecodeTrace> d(
 280                 new DecodeTrace(session_, signal, decode_traces_.size()));
 281         decode_traces_.push_back(d);
 282
 283         d->set_segment_display_mode(segment_display_mode_);
 284         d->set_current_segment(current_segment_);
 285
 286         connect(signal.get(), SIGNAL(name_changed(const QString&)),
 287                 this, SLOT(on_signal_name_changed()));
 288 }
 289
 290 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 291 {
 292         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 293                 if ((*i)->base() == signal) {
 294                         decode_traces_.erase(i);
 295                         signals_changed();
 296                         return;
 297                 }
 298 }
 299 #endif
 300
 301 View* View::view()
 302 {
 303         return this;
 304 }
 305
 306 const View* View::view() const
 307 {
 308         return this;
 309 }
 310
 311 Viewport* View::viewport()
 312 {
 313         return viewport_;
 314 }
 315
 316 const Viewport* View::viewport() const
 317 {
 318         return viewport_;
 319 }
 320
 321 void View::save_settings(QSettings &settings) const
 322 {
 323         settings.setValue("scale", scale_);
 324         settings.setValue("v_offset",
 325                 scrollarea_->verticalScrollBar()->sliderPosition());
 326
 327         settings.setValue("splitter_state", splitter_->saveState());
 328         settings.setValue("segment_display_mode", segment_display_mode_);
 329
 330         {
 331                 stringstream ss;
 332                 boost::archive::text_oarchive oa(ss);
 333                 oa << boost::serialization::make_nvp("ruler_shift", ruler_shift_);
 334                 settings.setValue("ruler_shift", QString::fromStdString(ss.str()));
 335         }
 336         {
 337                 stringstream ss;
 338                 boost::archive::text_oarchive oa(ss);
 339                 oa << boost::serialization::make_nvp("offset", offset_);
 340                 settings.setValue("offset", QString::fromStdString(ss.str()));
 341         }
 342
 343         for (shared_ptr<Signal> signal : signals_) {
 344                 settings.beginGroup(signal->base()->internal_name());
 345                 signal->save_settings(settings);
 346                 settings.endGroup();
 347         }
 348 }
 349
 350 void View::restore_settings(QSettings &settings)
 351 {
 352         // Note: It is assumed that this function is only called once,
 353         // immediately after restoring a previous session.
 354
 355         if (settings.contains("scale"))
 356                 set_scale(settings.value("scale").toDouble());
 357
 358         if (settings.contains("ruler_shift")) {
 359                 util::Timestamp shift;
 360                 stringstream ss;
 361                 ss << settings.value("ruler_shift").toString().toStdString();
 362
 363                 boost::archive::text_iarchive ia(ss);
 364                 ia >> boost::serialization::make_nvp("ruler_shift", shift);
 365
 366                 ruler_shift_ = shift;
 367         }
 368
 369         if (settings.contains("offset")) {
 370                 util::Timestamp offset;
 371                 stringstream ss;
 372                 ss << settings.value("offset").toString().toStdString();
 373
 374                 boost::archive::text_iarchive ia(ss);
 375                 ia >> boost::serialization::make_nvp("offset", offset);
 376
 377                 // This also updates ruler_offset_
 378                 set_offset(offset);
 379         }
 380
 381         if (settings.contains("splitter_state"))
 382                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 383
 384         if (settings.contains("segment_display_mode"))
 385                 set_segment_display_mode(
 386                         (Trace::SegmentDisplayMode)(settings.value("segment_display_mode").toInt()));
 387
 388         for (shared_ptr<Signal> signal : signals_) {
 389                 settings.beginGroup(signal->base()->internal_name());
 390                 signal->restore_settings(settings);
 391                 settings.endGroup();
 392         }
 393
 394         if (settings.contains("v_offset")) {
 395                 saved_v_offset_ = settings.value("v_offset").toInt();
 396                 set_v_offset(saved_v_offset_);
 397                 scroll_needs_defaults_ = false;
 398                 // Note: see eventFilter() for additional information
 399         }
 400
 401         settings_restored_ = true;
 402         suppress_zoom_to_fit_after_acq_ = true;
 403
 404         // Update the ruler so that it uses the new scale
 405         calculate_tick_spacing();
 406 }
 407
 408 vector< shared_ptr<TimeItem> > View::time_items() const
 409 {
 410         const vector<shared_ptr<Flag>> f(flags());
 411         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 412         items.push_back(cursors_);
 413         items.push_back(cursors_->first());
 414         items.push_back(cursors_->second());
 415
 416         for (auto trigger_marker : trigger_markers_)
 417                 items.push_back(trigger_marker);
 418
 419         return items;
 420 }
 421
 422 double View::scale() const
 423 {
 424         return scale_;
 425 }
 426
 427 void View::set_scale(double scale)
 428 {
 429         if (scale_ != scale) {
 430                 scale_ = scale;
 431                 scale_changed();
 432         }
 433 }
 434
 435 void View::set_offset(const pv::util::Timestamp& offset)
 436 {
 437         if (offset_ != offset) {
 438                 offset_ = offset;
 439                 ruler_offset_ = offset_ + ruler_shift_;
 440                 offset_changed();
 441         }
 442 }
 443
 444 // Returns the internal version of the time offset
 445 const Timestamp& View::offset() const
 446 {
 447         return offset_;
 448 }
 449
 450 // Returns the ruler version of the time offset
 451 const Timestamp& View::ruler_offset() const
 452 {
 453         return ruler_offset_;
 454 }
 455
 456 int View::owner_visual_v_offset() const
 457 {
 458         return -scrollarea_->verticalScrollBar()->sliderPosition();
 459 }
 460
 461 void View::set_v_offset(int offset)
 462 {
 463         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 464         header_->update();
 465         viewport_->update();
 466 }
 467
 468 unsigned int View::depth() const
 469 {
 470         return 0;
 471 }
 472
 473 uint32_t View::current_segment() const
 474 {
 475         return current_segment_;
 476 }
 477
 478 pv::util::SIPrefix View::tick_prefix() const
 479 {
 480         return tick_prefix_;
 481 }
 482
 483 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 484 {
 485         if (tick_prefix_ != tick_prefix) {
 486                 tick_prefix_ = tick_prefix;
 487                 tick_prefix_changed();
 488         }
 489 }
 490
 491 unsigned int View::tick_precision() const
 492 {
 493         return tick_precision_;
 494 }
 495
 496 void View::set_tick_precision(unsigned tick_precision)
 497 {
 498         if (tick_precision_ != tick_precision) {
 499                 tick_precision_ = tick_precision;
 500                 tick_precision_changed();
 501         }
 502 }
 503
 504 const pv::util::Timestamp& View::tick_period() const
 505 {
 506         return tick_period_;
 507 }
 508
 509 unsigned int View::minor_tick_count() const
 510 {
 511         return minor_tick_count_;
 512 }
 513
 514 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 515 {
 516         if (tick_period_ != tick_period) {
 517                 tick_period_ = tick_period;
 518                 tick_period_changed();
 519         }
 520 }
 521
 522 TimeUnit View::time_unit() const
 523 {
 524         return time_unit_;
 525 }
 526
 527 void View::set_time_unit(pv::util::TimeUnit time_unit)
 528 {
 529         if (time_unit_ != time_unit) {
 530                 time_unit_ = time_unit;
 531                 time_unit_changed();
 532         }
 533 }
 534
 535 void View::set_current_segment(uint32_t segment_id)
 536 {
 537         current_segment_ = segment_id;
 538
 539         for (shared_ptr<Signal> signal : signals_)
 540                 signal->set_current_segment(current_segment_);
 541         for (shared_ptr<DecodeTrace> dt : decode_traces_)
 542                 dt->set_current_segment(current_segment_);
 543
 544         viewport_->update();
 545
 546         segment_changed(segment_id);
 547 }
 548
 549 bool View::segment_is_selectable() const
 550 {
 551         return segment_selectable_;
 552 }
 553
 554 Trace::SegmentDisplayMode View::segment_display_mode() const
 555 {
 556         return segment_display_mode_;
 557 }
 558
 559 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 560 {
 561         segment_display_mode_ = mode;
 562
 563         for (shared_ptr<Signal> signal : signals_)
 564                 signal->set_segment_display_mode(mode);
 565
 566         uint32_t last_segment = session_.get_segment_count() - 1;
 567
 568         switch (mode) {
 569         case Trace::ShowLastSegmentOnly:
 570                 if (current_segment_ != last_segment)
 571                         set_current_segment(last_segment);
 572                 break;
 573
 574         case Trace::ShowLastCompleteSegmentOnly:
 575                 // Do nothing if we only have one segment so far
 576                 if (last_segment > 0) {
 577                         // If the last segment isn't complete, the previous one must be
 578                         uint32_t segment_id =
 579                                 (session_.all_segments_complete(last_segment)) ?
 580                                 last_segment : last_segment - 1;
 581
 582                         if (current_segment_ != segment_id)
 583                                 set_current_segment(segment_id);
 584                 }
 585                 break;
 586
 587         case Trace::ShowSingleSegmentOnly:
 588         case Trace::ShowAllSegments:
 589         case Trace::ShowAccumulatedIntensity:
 590         default:
 591                 // Current segment remains as-is
 592                 break;
 593         }
 594
 595         segment_selectable_ = true;
 596
 597         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 598                 segment_selectable_ = false;
 599
 600         viewport_->update();
 601
 602         segment_display_mode_changed((int)mode, segment_selectable_);
 603 }
 604
 605 void View::zoom(double steps)
 606 {
 607         zoom(steps, viewport_->width() / 2);
 608 }
 609
 610 void View::zoom(double steps, int offset)
 611 {
 612         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 613 }
 614
 615 void View::zoom_fit(bool gui_state)
 616 {
 617         // Act as one-shot when stopped, toggle along with the GUI otherwise
 618         if (session_.get_capture_state() == Session::Stopped) {
 619                 always_zoom_to_fit_ = false;
 620                 always_zoom_to_fit_changed(false);
 621         } else {
 622                 always_zoom_to_fit_ = gui_state;
 623                 always_zoom_to_fit_changed(gui_state);
 624         }
 625
 626         const pair<Timestamp, Timestamp> extents = get_time_extents();
 627         const Timestamp delta = extents.second - extents.first;
 628         if (delta < Timestamp("1e-12"))
 629                 return;
 630
 631         assert(viewport_);
 632         const int w = viewport_->width();
 633         if (w <= 0)
 634                 return;
 635
 636         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 637         set_scale_offset(scale.convert_to<double>(), extents.first);
 638 }
 639
 640 void View::zoom_one_to_one()
 641 {
 642         using pv::data::SignalData;
 643
 644         // Make a set of all the visible data objects
 645         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 646         if (visible_data.empty())
 647                 return;
 648
 649         assert(viewport_);
 650         const int w = viewport_->width();
 651         if (w <= 0)
 652                 return;
 653
 654         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 655 }
 656
 657 void View::set_scale_offset(double scale, const Timestamp& offset)
 658 {
 659         // Disable sticky scrolling / always zoom to fit when acquisition runs
 660         // and user drags the viewport
 661         if ((scale_ == scale) && (offset_ != offset) &&
 662                         (session_.get_capture_state() == Session::Running)) {
 663
 664                 if (sticky_scrolling_) {
 665                         sticky_scrolling_ = false;
 666                         sticky_scrolling_changed(false);
 667                 }
 668
 669                 if (always_zoom_to_fit_) {
 670                         always_zoom_to_fit_ = false;
 671                         always_zoom_to_fit_changed(false);
 672                 }
 673         }
 674
 675         set_scale(scale);
 676         set_offset(offset);
 677
 678         calculate_tick_spacing();
 679
 680         update_scroll();
 681         ruler_->update();
 682         viewport_->update();
 683 }
 684
 685 set< shared_ptr<SignalData> > View::get_visible_data() const
 686 {
 687         // Make a set of all the visible data objects
 688         set< shared_ptr<SignalData> > visible_data;
 689         for (const shared_ptr<Signal> sig : signals_)
 690                 if (sig->enabled())
 691                         visible_data.insert(sig->data());
 692
 693         return visible_data;
 694 }
 695
 696 pair<Timestamp, Timestamp> View::get_time_extents() const
 697 {
 698         boost::optional<Timestamp> left_time, right_time;
 699         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 700         for (const shared_ptr<SignalData> d : visible_data) {
 701                 const vector< shared_ptr<Segment> > segments = d->segments();
 702                 for (const shared_ptr<Segment> &s : segments) {
 703                         double samplerate = s->samplerate();
 704                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 705
 706                         const Timestamp start_time = s->start_time();
 707                         left_time = left_time ?
 708                                 min(*left_time, start_time) :
 709                                                 start_time;
 710                         right_time = right_time ?
 711                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 712                                                  start_time + d->max_sample_count() / samplerate;
 713                 }
 714         }
 715
 716         if (!left_time || !right_time)
 717                 return make_pair(0, 0);
 718
 719         assert(*left_time < *right_time);
 720         return make_pair(*left_time, *right_time);
 721 }
 722
 723 void View::enable_show_sampling_points(bool state)
 724 {
 725         (void)state;
 726
 727         viewport_->update();
 728 }
 729
 730 void View::enable_show_analog_minor_grid(bool state)
 731 {
 732         (void)state;
 733
 734         viewport_->update();
 735 }
 736
 737 void View::enable_coloured_bg(bool state)
 738 {
 739         coloured_bg_ = state;
 740         viewport_->update();
 741 }
 742
 743 bool View::coloured_bg() const
 744 {
 745         return coloured_bg_;
 746 }
 747
 748 bool View::cursors_shown() const
 749 {
 750         return show_cursors_;
 751 }
 752
 753 void View::show_cursors(bool show)
 754 {
 755         show_cursors_ = show;
 756         ruler_->update();
 757         viewport_->update();
 758 }
 759
 760 void View::centre_cursors()
 761 {
 762         const double time_width = scale_ * viewport_->width();
 763         cursors_->first()->set_time(offset_ + time_width * 0.4);
 764         cursors_->second()->set_time(offset_ + time_width * 0.6);
 765         ruler_->update();
 766         viewport_->update();
 767 }
 768
 769 shared_ptr<CursorPair> View::cursors() const
 770 {
 771         return cursors_;
 772 }
 773
 774 void View::add_flag(const Timestamp& time)
 775 {
 776         flags_.push_back(make_shared<Flag>(*this, time,
 777                 QString("%1").arg(next_flag_text_)));
 778
 779         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 780                 (next_flag_text_ + 1);
 781
 782         time_item_appearance_changed(true, true);
 783 }
 784
 785 void View::remove_flag(shared_ptr<Flag> flag)
 786 {
 787         flags_.remove(flag);
 788         time_item_appearance_changed(true, true);
 789 }
 790
 791 vector< shared_ptr<Flag> > View::flags() const
 792 {
 793         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 794         stable_sort(flags.begin(), flags.end(),
 795                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 796                         return a->time() < b->time();
 797                 });
 798
 799         return flags;
 800 }
 801
 802 const QPoint& View::hover_point() const
 803 {
 804         return hover_point_;
 805 }
 806
 807 void View::restack_all_trace_tree_items()
 808 {
 809         // Make a list of owners that is sorted from deepest first
 810         const vector<shared_ptr<TraceTreeItem>> items(
 811                 list_by_type<TraceTreeItem>());
 812         set< TraceTreeItemOwner* > owners;
 813         for (const auto &r : items)
 814                 owners.insert(r->owner());
 815         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 816         sort(sorted_owners.begin(), sorted_owners.end(),
 817                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 818                         return a->depth() > b->depth(); });
 819
 820         // Restack the items recursively
 821         for (auto &o : sorted_owners)
 822                 o->restack_items();
 823
 824         // Animate the items to their destination
 825         for (const auto &i : items)
 826                 i->animate_to_layout_v_offset();
 827 }
 828
 829 void View::trigger_event(util::Timestamp location)
 830 {
 831         // Set up ruler_shift if the Key_View_TriggerIsZeroTime option is set.
 832         GlobalSettings settings;
 833         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 834
 835         ruler_shift_ = (trigger_is_zero_time) ? (-location) : (0);
 836         // Force an immediate update of both offsets
 837         offset_ -= 0.001;
 838         set_offset(offset_ + 0.001);
 839
 840         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 841 }
 842
 843 void View::get_scroll_layout(double &length, Timestamp &offset) const
 844 {
 845         const pair<Timestamp, Timestamp> extents = get_time_extents();
 846         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 847         offset = offset_ / scale_;
 848 }
 849
 850 void View::set_zoom(double scale, int offset)
 851 {
 852         // Reset the "always zoom to fit" feature as the user changed the zoom
 853         always_zoom_to_fit_ = false;
 854         always_zoom_to_fit_changed(false);
 855
 856         const Timestamp cursor_offset = offset_ + scale_ * offset;
 857         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 858         const Timestamp new_offset = cursor_offset - new_scale * offset;
 859         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 860 }
 861
 862 void View::calculate_tick_spacing()
 863 {
 864         const double SpacingIncrement = 10.0f;
 865         const double MinValueSpacing = 40.0f;
 866
 867         // Figure out the highest numeric value visible on a label
 868         const QSize areaSize = viewport_->size();
 869         const Timestamp max_time = max(fabs(offset_),
 870                 fabs(offset_ + scale_ * areaSize.width()));
 871
 872         double min_width = SpacingIncrement;
 873         double label_width, tick_period_width;
 874
 875         QFontMetrics m(QApplication::font());
 876
 877         // Copies of the member variables with the same name, used in the calculation
 878         // and written back afterwards, so that we don't emit signals all the time
 879         // during the calculation.
 880         pv::util::Timestamp tick_period = tick_period_;
 881         pv::util::SIPrefix tick_prefix = tick_prefix_;
 882         unsigned tick_precision = tick_precision_;
 883
 884         do {
 885                 const double min_period = scale_ * min_width;
 886
 887                 const int order = (int)floorf(log10f(min_period));
 888                 const pv::util::Timestamp order_decimal =
 889                         pow(pv::util::Timestamp(10), order);
 890
 891                 // Allow for a margin of error so that a scale unit of 1 can be used.
 892                 // Otherwise, for a SU of 1 the tick period will almost always be below
 893                 // the min_period by a small amount - and thus skipped in favor of 2.
 894                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 895                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 896                 double tp_with_margin;
 897                 unsigned int unit = 0;
 898
 899                 do {
 900                         tp_with_margin = order_decimal.convert_to<double>() *
 901                                 (ScaleUnits[unit++] + tp_margin);
 902                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 903
 904                 minor_tick_count_ = (unit == 2) ? (4) : (5);
 905                 tick_period = order_decimal * ScaleUnits[unit - 1];
 906                 tick_prefix = static_cast<pv::util::SIPrefix>(
 907                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 908
 909                 // Precision is the number of fractional digits required, not
 910                 // taking the prefix into account (and it must never be negative)
 911                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 912
 913                 tick_period_width = (tick_period / scale_).convert_to<double>();
 914
 915                 const QString label_text = Ruler::format_time_with_distance(
 916                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 917
 918                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 919                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 920                                 MinValueSpacing;
 921
 922                 min_width += SpacingIncrement;
 923         } while (tick_period_width < label_width);
 924
 925         set_tick_period(tick_period);
 926         set_tick_prefix(tick_prefix);
 927         set_tick_precision(tick_precision);
 928 }
 929
 930 void View::adjust_top_margin()
 931 {
 932         assert(viewport_);
 933
 934         const QSize areaSize = viewport_->size();
 935
 936         const pair<int, int> extents = v_extents();
 937         const int top_margin = owner_visual_v_offset() + extents.first;
 938         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
 939
 940         // Do we have empty space at the top while the last trace goes out of screen?
 941         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
 942                 const int trace_height = extents.second - extents.first;
 943
 944                 // Center everything vertically if there is enough space
 945                 if (areaSize.height() >= trace_height)
 946                         set_v_offset(extents.first -
 947                                 ((areaSize.height() - trace_height) / 2));
 948                 else
 949                         // Remove the top margin to make as many traces fit on screen as possible
 950                         set_v_offset(extents.first);
 951         }
 952 }
 953
 954 void View::update_scroll()
 955 {
 956         assert(viewport_);
 957         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
 958         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
 959
 960         const QSize areaSize = viewport_->size();
 961
 962         // Set the horizontal scroll bar
 963         double length = 0;
 964         Timestamp offset;
 965         get_scroll_layout(length, offset);
 966         length = max(length - areaSize.width(), 0.0);
 967
 968         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
 969
 970         hscrollbar->setPageStep(areaSize.width() / 2);
 971         hscrollbar->setSingleStep(major_tick_distance);
 972
 973         updating_scroll_ = true;
 974
 975         if (length < MaxScrollValue) {
 976                 hscrollbar->setRange(0, length);
 977                 hscrollbar->setSliderPosition(offset.convert_to<double>());
 978         } else {
 979                 hscrollbar->setRange(0, MaxScrollValue);
 980                 hscrollbar->setSliderPosition(
 981                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
 982         }
 983
 984         updating_scroll_ = false;
 985
 986         // Set the vertical scrollbar
 987         vscrollbar->setPageStep(areaSize.height());
 988         vscrollbar->setSingleStep(areaSize.height() / 8);
 989
 990         const pair<int, int> extents = v_extents();
 991
 992         // Don't change the scrollbar range if there are no traces
 993         if (extents.first != extents.second)
 994                 vscrollbar->setRange(extents.first - areaSize.height(),
 995                         extents.second);
 996
 997         if (scroll_needs_defaults_)
 998                 set_scroll_default();
 999 }
1000
1001 void View::reset_scroll()
1002 {
1003         scrollarea_->verticalScrollBar()->setRange(0, 0);
1004 }
1005
1006 void View::set_scroll_default()
1007 {
1008         assert(viewport_);
1009
1010         const QSize areaSize = viewport_->size();
1011
1012         const pair<int, int> extents = v_extents();
1013         const int trace_height = extents.second - extents.first;
1014
1015         // Do all traces fit in the view?
1016         if (areaSize.height() >= trace_height)
1017                 // Center all traces vertically
1018                 set_v_offset(extents.first -
1019                         ((areaSize.height() - trace_height) / 2));
1020         else
1021                 // Put the first trace at the top, letting the bottom ones overflow
1022                 set_v_offset(extents.first);
1023 }
1024
1025 void View::determine_if_header_was_shrunk()
1026 {
1027         const int header_pane_width = splitter_->sizes().front();
1028         const int header_width = header_->extended_size_hint().width();
1029
1030         // Allow for a slight margin of error so that we also accept
1031         // slight differences when e.g. a label name change increased
1032         // the overall width
1033         header_was_shrunk_ = (header_pane_width < (header_width - 10));
1034 }
1035
1036 void View::resize_header_to_fit()
1037 {
1038         // Setting the maximum width of the header widget doesn't work as
1039         // expected because the splitter would allow the user to make the
1040         // pane wider than that, creating empty space as a result.
1041         // To make this work, we stricly enforce the maximum width by
1042         // expanding the header unless the user shrunk it on purpose.
1043         // As we're then setting the width of the header pane, we set the
1044         // splitter to the maximum allowed position.
1045
1046         int splitter_area_width = 0;
1047         for (int w : splitter_->sizes())
1048                 splitter_area_width += w;
1049
1050         // Make sure the header has enough horizontal space to show all labels fully
1051         QList<int> pane_sizes;
1052         pane_sizes.push_back(header_->extended_size_hint().width());
1053         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1054         splitter_->setSizes(pane_sizes);
1055 }
1056
1057 void View::update_layout()
1058 {
1059         update_scroll();
1060 }
1061
1062 TraceTreeItemOwner* View::find_prevalent_trace_group(
1063         const shared_ptr<sigrok::ChannelGroup> &group,
1064         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1065                 &signal_map)
1066 {
1067         assert(group);
1068
1069         unordered_set<TraceTreeItemOwner*> owners;
1070         vector<TraceTreeItemOwner*> owner_list;
1071
1072         // Make a set and a list of all the owners
1073         for (const auto &channel : group->channels()) {
1074                 for (auto entry : signal_map) {
1075                         if (entry.first->channel() == channel) {
1076                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1077                                 owner_list.push_back(o);
1078                                 owners.insert(o);
1079                         }
1080                 }
1081         }
1082
1083         // Iterate through the list of owners, and find the most prevalent
1084         size_t max_prevalence = 0;
1085         TraceTreeItemOwner *prevalent_owner = nullptr;
1086         for (TraceTreeItemOwner *owner : owners) {
1087                 const size_t prevalence = count_if(
1088                         owner_list.begin(), owner_list.end(),
1089                         [&](TraceTreeItemOwner *o) { return o == owner; });
1090                 if (prevalence > max_prevalence) {
1091                         max_prevalence = prevalence;
1092                         prevalent_owner = owner;
1093                 }
1094         }
1095
1096         return prevalent_owner;
1097 }
1098
1099 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1100         const vector< shared_ptr<sigrok::Channel> > &channels,
1101         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1102                 &signal_map,
1103         set< shared_ptr<Trace> > &add_list)
1104 {
1105         vector< shared_ptr<Trace> > filtered_traces;
1106
1107         for (const auto &channel : channels) {
1108                 for (auto entry : signal_map) {
1109                         if (entry.first->channel() == channel) {
1110                                 shared_ptr<Trace> trace = entry.second;
1111                                 const auto list_iter = add_list.find(trace);
1112                                 if (list_iter == add_list.end())
1113                                         continue;
1114
1115                                 filtered_traces.push_back(trace);
1116                                 add_list.erase(list_iter);
1117                         }
1118                 }
1119         }
1120
1121         return filtered_traces;
1122 }
1123
1124 void View::determine_time_unit()
1125 {
1126         // Check whether we know the sample rate and hence can use time as the unit
1127         if (time_unit_ == util::TimeUnit::Samples) {
1128                 // Check all signals but...
1129                 for (const shared_ptr<Signal> signal : signals_) {
1130                         const shared_ptr<SignalData> data = signal->data();
1131
1132                         // ...only check first segment of each
1133                         const vector< shared_ptr<Segment> > segments = data->segments();
1134                         if (!segments.empty())
1135                                 if (segments[0]->samplerate()) {
1136                                         set_time_unit(util::TimeUnit::Time);
1137                                         break;
1138                                 }
1139                 }
1140         }
1141 }
1142
1143 bool View::eventFilter(QObject *object, QEvent *event)
1144 {
1145         const QEvent::Type type = event->type();
1146         if (type == QEvent::MouseMove) {
1147
1148                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1149                 if (object == viewport_)
1150                         hover_point_ = mouse_event->pos();
1151                 else if (object == ruler_)
1152                         hover_point_ = QPoint(mouse_event->x(), 0);
1153                 else if (object == header_)
1154                         hover_point_ = QPoint(0, mouse_event->y());
1155                 else
1156                         hover_point_ = QPoint(-1, -1);
1157
1158                 update_hover_point();
1159
1160         } else if (type == QEvent::Leave) {
1161                 hover_point_ = QPoint(-1, -1);
1162                 update_hover_point();
1163         } else if (type == QEvent::Show) {
1164
1165                 // This is somewhat of a hack, unfortunately. We cannot use
1166                 // set_v_offset() from within restore_settings() as the view
1167                 // at that point is neither visible nor properly sized.
1168                 // This is the least intrusive workaround I could come up
1169                 // with: set the vertical offset (or scroll defaults) when
1170                 // the view is shown, which happens after all widgets were
1171                 // resized to their final sizes.
1172                 update_layout();
1173
1174                 if (settings_restored_)
1175                         determine_if_header_was_shrunk();
1176                 else
1177                         resize_header_to_fit();
1178
1179                 if (scroll_needs_defaults_) {
1180                         set_scroll_default();
1181                         scroll_needs_defaults_ = false;
1182                 }
1183
1184                 if (saved_v_offset_) {
1185                         set_v_offset(saved_v_offset_);
1186                         saved_v_offset_ = 0;
1187                 }
1188         }
1189
1190         return QObject::eventFilter(object, event);
1191 }
1192
1193 void View::resizeEvent(QResizeEvent* event)
1194 {
1195         // Only adjust the top margin if we shrunk vertically
1196         if (event->size().height() < event->oldSize().height())
1197                 adjust_top_margin();
1198
1199         update_layout();
1200 }
1201
1202 void View::update_hover_point()
1203 {
1204         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1205                 list_by_type<TraceTreeItem>());
1206         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1207                 r->hover_point_changed(hover_point_);
1208
1209         hover_point_changed(hover_point_);
1210 }
1211
1212 void View::row_item_appearance_changed(bool label, bool content)
1213 {
1214         if (label)
1215                 header_->update();
1216         if (content)
1217                 viewport_->update();
1218 }
1219
1220 void View::time_item_appearance_changed(bool label, bool content)
1221 {
1222         if (label) {
1223                 ruler_->update();
1224
1225                 // Make sure the header pane width is updated, too
1226                 update_layout();
1227         }
1228
1229         if (content)
1230                 viewport_->update();
1231 }
1232
1233 void View::extents_changed(bool horz, bool vert)
1234 {
1235         sticky_events_ |=
1236                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1237                 (vert ? TraceTreeItemVExtentsChanged : 0);
1238
1239         lazy_event_handler_.start();
1240 }
1241
1242 void View::on_signal_name_changed()
1243 {
1244         if (!header_was_shrunk_)
1245                 resize_header_to_fit();
1246 }
1247
1248 void View::on_splitter_moved()
1249 {
1250         // The header can only shrink when the splitter is moved manually
1251         determine_if_header_was_shrunk();
1252
1253         if (!header_was_shrunk_)
1254                 resize_header_to_fit();
1255 }
1256
1257 void View::h_scroll_value_changed(int value)
1258 {
1259         if (updating_scroll_)
1260                 return;
1261
1262         // Disable sticky scrolling when user moves the horizontal scroll bar
1263         // during a running acquisition
1264         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1265                 sticky_scrolling_ = false;
1266                 sticky_scrolling_changed(false);
1267         }
1268
1269         const int range = scrollarea_->horizontalScrollBar()->maximum();
1270         if (range < MaxScrollValue)
1271                 set_offset(scale_ * value);
1272         else {
1273                 double length = 0;
1274                 Timestamp offset;
1275                 get_scroll_layout(length, offset);
1276                 set_offset(scale_ * length * value / MaxScrollValue);
1277         }
1278
1279         ruler_->update();
1280         viewport_->update();
1281 }
1282
1283 void View::v_scroll_value_changed()
1284 {
1285         header_->update();
1286         viewport_->update();
1287 }
1288
1289 void View::signals_changed()
1290 {
1291         using sigrok::Channel;
1292
1293         vector< shared_ptr<Channel> > channels;
1294         shared_ptr<sigrok::Device> sr_dev;
1295         bool signals_added_or_removed = false;
1296
1297         // Do we need to set the vertical scrollbar to its default position later?
1298         // We do if there are no traces, i.e. the scroll bar has no range set
1299         bool reset_scrollbar =
1300                 (scrollarea_->verticalScrollBar()->minimum() ==
1301                         scrollarea_->verticalScrollBar()->maximum());
1302
1303         if (!session_.device()) {
1304                 reset_scroll();
1305                 signals_.clear();
1306         } else {
1307                 sr_dev = session_.device()->device();
1308                 assert(sr_dev);
1309                 channels = sr_dev->channels();
1310         }
1311
1312         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1313
1314         // Make a list of traces that are being added, and a list of traces
1315         // that are being removed
1316         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1317         const set<shared_ptr<Trace>> prev_traces(
1318                 prev_trace_list.begin(), prev_trace_list.end());
1319
1320         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1321
1322 #ifdef ENABLE_DECODE
1323         traces.insert(decode_traces_.begin(), decode_traces_.end());
1324 #endif
1325
1326         set< shared_ptr<Trace> > add_traces;
1327         set_difference(traces.begin(), traces.end(),
1328                 prev_traces.begin(), prev_traces.end(),
1329                 inserter(add_traces, add_traces.begin()));
1330
1331         set< shared_ptr<Trace> > remove_traces;
1332         set_difference(prev_traces.begin(), prev_traces.end(),
1333                 traces.begin(), traces.end(),
1334                 inserter(remove_traces, remove_traces.begin()));
1335
1336         // Make a look-up table of sigrok Channels to pulseview Signals
1337         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1338                 signal_map;
1339         for (const shared_ptr<Signal> &sig : signals_)
1340                 signal_map[sig->base()] = sig;
1341
1342         // Populate channel groups
1343         if (sr_dev)
1344                 for (auto entry : sr_dev->channel_groups()) {
1345                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1346
1347                         if (group->channels().size() <= 1)
1348                                 continue;
1349
1350                         // Find best trace group to add to
1351                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1352                                 group, signal_map);
1353
1354                         // If there is no trace group, create one
1355                         shared_ptr<TraceGroup> new_trace_group;
1356                         if (!owner) {
1357                                 new_trace_group.reset(new TraceGroup());
1358                                 owner = new_trace_group.get();
1359                         }
1360
1361                         // Extract traces for the trace group, removing them from
1362                         // the add list
1363                         const vector< shared_ptr<Trace> > new_traces_in_group =
1364                                 extract_new_traces_for_channels(group->channels(),
1365                                         signal_map, add_traces);
1366
1367                         // Add the traces to the group
1368                         const pair<int, int> prev_v_extents = owner->v_extents();
1369                         int offset = prev_v_extents.second - prev_v_extents.first;
1370                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1371                                 assert(trace);
1372                                 owner->add_child_item(trace);
1373
1374                                 const pair<int, int> extents = trace->v_extents();
1375                                 if (trace->enabled())
1376                                         offset += -extents.first;
1377                                 trace->force_to_v_offset(offset);
1378                                 if (trace->enabled())
1379                                         offset += extents.second;
1380                         }
1381
1382                         if (new_trace_group) {
1383                                 // Assign proper vertical offsets to each channel in the group
1384                                 new_trace_group->restack_items();
1385
1386                                 // If this is a new group, enqueue it in the new top level
1387                                 // items list
1388                                 if (!new_traces_in_group.empty())
1389                                         new_top_level_items.push_back(new_trace_group);
1390                         }
1391                 }
1392
1393         // Enqueue the remaining logic channels in a group
1394         vector< shared_ptr<Channel> > logic_channels;
1395         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1396                 [](const shared_ptr<Channel>& c) {
1397                         return c->type() == sigrok::ChannelType::LOGIC; });
1398
1399         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1400                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1401
1402         if (non_grouped_logic_signals.size() > 0) {
1403                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1404                         make_shared<TraceGroup>());
1405                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1406                         non_grouped_trace_group->add_child_item(trace);
1407
1408                 non_grouped_trace_group->restack_items();
1409                 new_top_level_items.push_back(non_grouped_trace_group);
1410         }
1411
1412         // Enqueue the remaining channels as free ungrouped traces
1413         const vector< shared_ptr<Trace> > new_top_level_signals =
1414                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1415         new_top_level_items.insert(new_top_level_items.end(),
1416                 new_top_level_signals.begin(), new_top_level_signals.end());
1417
1418         // Enqueue any remaining traces i.e. decode traces
1419         new_top_level_items.insert(new_top_level_items.end(),
1420                 add_traces.begin(), add_traces.end());
1421
1422         // Remove any removed traces
1423         for (shared_ptr<Trace> trace : remove_traces) {
1424                 TraceTreeItemOwner *const owner = trace->owner();
1425                 assert(owner);
1426                 owner->remove_child_item(trace);
1427                 signals_added_or_removed = true;
1428         }
1429
1430         // Remove any empty trace groups
1431         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1432                 if (group->child_items().size() == 0) {
1433                         remove_child_item(group);
1434                         group.reset();
1435                 }
1436
1437         // Add and position the pending top levels items
1438         int offset = v_extents().second;
1439         for (auto item : new_top_level_items) {
1440                 add_child_item(item);
1441
1442                 // Position the item after the last item or at the top if there is none
1443                 const pair<int, int> extents = item->v_extents();
1444
1445                 if (item->enabled())
1446                         offset += -extents.first;
1447
1448                 item->force_to_v_offset(offset);
1449
1450                 if (item->enabled())
1451                         offset += extents.second;
1452                 signals_added_or_removed = true;
1453         }
1454
1455
1456         if (signals_added_or_removed && !header_was_shrunk_)
1457                 resize_header_to_fit();
1458
1459         update_layout();
1460
1461         header_->update();
1462         viewport_->update();
1463
1464         if (reset_scrollbar)
1465                 set_scroll_default();
1466 }
1467
1468 void View::capture_state_updated(int state)
1469 {
1470         GlobalSettings settings;
1471
1472         if (state == Session::Running) {
1473                 set_time_unit(util::TimeUnit::Samples);
1474
1475                 trigger_markers_.clear();
1476
1477                 scale_at_acq_start_ = scale_;
1478                 offset_at_acq_start_ = offset_;
1479
1480                 // Activate "always zoom to fit" if the setting is enabled and we're
1481                 // the main view of this session (other trace views may be used for
1482                 // zooming and we don't want to mess them up)
1483                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1484                 if (is_main_view_ && state) {
1485                         always_zoom_to_fit_ = true;
1486                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1487                 }
1488
1489                 // Enable sticky scrolling if the setting is enabled
1490                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1491
1492                 // Reset all traces to segment 0
1493                 current_segment_ = 0;
1494                 set_current_segment(current_segment_);
1495         }
1496
1497         if (state == Session::Stopped) {
1498                 // After acquisition has stopped we need to re-calculate the ticks once
1499                 // as it's otherwise done when the user pans or zooms, which is too late
1500                 calculate_tick_spacing();
1501
1502                 // Reset "always zoom to fit", the acquisition has stopped
1503                 if (always_zoom_to_fit_) {
1504                         // Perform a final zoom-to-fit before disabling
1505                         zoom_fit(always_zoom_to_fit_);
1506                         always_zoom_to_fit_ = false;
1507                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1508                 }
1509
1510                 bool zoom_to_fit_after_acq =
1511                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1512
1513                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1514                 // we didn't restore settings in the meanwhile
1515                 if (zoom_to_fit_after_acq &&
1516                         !suppress_zoom_to_fit_after_acq_ &&
1517                         (scale_ == scale_at_acq_start_) &&
1518                         (offset_ == offset_at_acq_start_))
1519                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1520
1521                 suppress_zoom_to_fit_after_acq_ = false;
1522         }
1523 }
1524
1525 void View::on_new_segment(int new_segment_id)
1526 {
1527         on_segment_changed(new_segment_id);
1528 }
1529
1530 void View::on_segment_completed(int segment_id)
1531 {
1532         on_segment_changed(segment_id);
1533 }
1534
1535 void View::on_segment_changed(int segment)
1536 {
1537         switch (segment_display_mode_) {
1538         case Trace::ShowLastSegmentOnly:
1539         case Trace::ShowSingleSegmentOnly:
1540                 set_current_segment(segment);
1541                 break;
1542
1543         case Trace::ShowLastCompleteSegmentOnly:
1544                 // Only update if all segments are complete
1545                 if (session_.all_segments_complete(segment))
1546                         set_current_segment(segment);
1547                 break;
1548
1549         case Trace::ShowAllSegments:
1550         case Trace::ShowAccumulatedIntensity:
1551         default:
1552                 break;
1553         }
1554 }
1555
1556 void View::perform_delayed_view_update()
1557 {
1558         if (always_zoom_to_fit_) {
1559                 zoom_fit(true);
1560         } else if (sticky_scrolling_) {
1561                 // Make right side of the view sticky
1562                 double length = 0;
1563                 Timestamp offset;
1564                 get_scroll_layout(length, offset);
1565
1566                 const QSize areaSize = viewport_->size();
1567                 length = max(length - areaSize.width(), 0.0);
1568
1569                 set_offset(scale_ * length);
1570         }
1571
1572         determine_time_unit();
1573         update_scroll();
1574         ruler_->update();
1575         viewport_->update();
1576 }
1577
1578 void View::process_sticky_events()
1579 {
1580         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1581                 update_layout();
1582         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1583                 restack_all_trace_tree_items();
1584                 update_scroll();
1585         }
1586
1587         // Clear the sticky events
1588         sticky_events_ = 0;
1589 }
1590
1591 } // namespace trace
1592 } // namespace views
1593 } // namespace pv