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 <QMenu>
  42 #include <QMouseEvent>
  43 #include <QScrollBar>
  44 #include <QVBoxLayout>
  45
  46 #include <libsigrokcxx/libsigrokcxx.hpp>
  47
  48 #include "analogsignal.hpp"
  49 #include "header.hpp"
  50 #include "logicsignal.hpp"
  51 #include "ruler.hpp"
  52 #include "signal.hpp"
  53 #include "tracegroup.hpp"
  54 #include "triggermarker.hpp"
  55 #include "view.hpp"
  56 #include "viewport.hpp"
  57
  58 #include "pv/data/logic.hpp"
  59 #include "pv/data/logicsegment.hpp"
  60 #include "pv/devices/device.hpp"
  61 #include "pv/globalsettings.hpp"
  62 #include "pv/session.hpp"
  63 #include "pv/util.hpp"
  64
  65 #ifdef ENABLE_DECODE
  66 #include "decodetrace.hpp"
  67 #endif
  68
  69 using pv::data::SignalData;
  70 using pv::data::Segment;
  71 using pv::util::TimeUnit;
  72 using pv::util::Timestamp;
  73
  74 using std::back_inserter;
  75 using std::copy_if;
  76 using std::count_if;
  77 using std::inserter;
  78 using std::max;
  79 using std::make_pair;
  80 using std::make_shared;
  81 using std::min;
  82 using std::numeric_limits;
  83 using std::pair;
  84 using std::set;
  85 using std::set_difference;
  86 using std::shared_ptr;
  87 using std::stringstream;
  88 using std::unordered_map;
  89 using std::unordered_set;
  90 using std::vector;
  91
  92 namespace pv {
  93 namespace views {
  94 namespace trace {
  95
  96 const Timestamp View::MaxScale("1e9");
  97 const Timestamp View::MinScale("1e-12");
  98
  99 const int View::MaxScrollValue = INT_MAX / 2;
 100
 101 const int View::ScaleUnits[3] = {1, 2, 5};
 102
 103
 104 CustomScrollArea::CustomScrollArea(QWidget *parent) :
 105         QAbstractScrollArea(parent)
 106 {
 107 }
 108
 109 bool CustomScrollArea::viewportEvent(QEvent *event)
 110 {
 111         switch (event->type()) {
 112         case QEvent::Paint:
 113         case QEvent::MouseButtonPress:
 114         case QEvent::MouseButtonRelease:
 115         case QEvent::MouseButtonDblClick:
 116         case QEvent::MouseMove:
 117         case QEvent::Wheel:
 118         case QEvent::TouchBegin:
 119         case QEvent::TouchUpdate:
 120         case QEvent::TouchEnd:
 121                 return false;
 122         default:
 123                 return QAbstractScrollArea::viewportEvent(event);
 124         }
 125 }
 126
 127 View::View(Session &session, bool is_main_view, QWidget *parent) :
 128         ViewBase(session, is_main_view, parent),
 129
 130         // Note: Place defaults in View::reset_view_state(), not here
 131         splitter_(new QSplitter()),
 132         header_was_shrunk_(false),  // The splitter remains unchanged after a reset, so this goes here
 133         sticky_scrolling_(false)  // Default setting is set in MainWindow::setup_ui()
 134 {
 135         QVBoxLayout *root_layout = new QVBoxLayout(this);
 136         root_layout->setContentsMargins(0, 0, 0, 0);
 137         root_layout->addWidget(splitter_);
 138
 139         viewport_ = new Viewport(*this);
 140         scrollarea_ = new CustomScrollArea(splitter_);
 141         scrollarea_->setViewport(viewport_);
 142         scrollarea_->setFrameShape(QFrame::NoFrame);
 143
 144         ruler_ = new Ruler(*this);
 145
 146         header_ = new Header(*this);
 147         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 148
 149         // We put the header into a simple layout so that we can add the top margin,
 150         // allowing us to make it line up with the bottom of the ruler
 151         QWidget *header_container = new QWidget();
 152         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 153         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 154         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 155         header_layout->addWidget(header_);
 156
 157         // To let the ruler and scrollarea be on the same split pane, we need a layout
 158         QWidget *trace_container = new QWidget();
 159         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 160         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 161         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 162         trace_layout->setContentsMargins(0, 0, 0, 0);
 163         trace_layout->addWidget(ruler_);
 164         trace_layout->addWidget(scrollarea_);
 165
 166         splitter_->addWidget(header_container);
 167         splitter_->addWidget(trace_container);
 168         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 169         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 170         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 171         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 172         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 173         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 174
 175         viewport_->installEventFilter(this);
 176         ruler_->installEventFilter(this);
 177         header_->installEventFilter(this);
 178
 179         // Set up settings and event handlers
 180         GlobalSettings settings;
 181         colored_bg_ = settings.value(GlobalSettings::Key_View_ColoredBG).toBool();
 182         snap_distance_ = settings.value(GlobalSettings::Key_View_SnapDistance).toInt();
 183
 184         GlobalSettings::add_change_handler(this);
 185
 186         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 187                 this, SLOT(h_scroll_value_changed(int)));
 188         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 189                 this, SLOT(v_scroll_value_changed()));
 190
 191         connect(header_, SIGNAL(selection_changed()),
 192                 ruler_, SLOT(clear_selection()));
 193         connect(ruler_, SIGNAL(selection_changed()),
 194                 header_, SLOT(clear_selection()));
 195
 196         connect(header_, SIGNAL(selection_changed()),
 197                 this, SIGNAL(selection_changed()));
 198         connect(ruler_, SIGNAL(selection_changed()),
 199                 this, SIGNAL(selection_changed()));
 200
 201         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 202                 this, SLOT(on_splitter_moved()));
 203
 204         connect(&lazy_event_handler_, SIGNAL(timeout()),
 205                 this, SLOT(process_sticky_events()));
 206         lazy_event_handler_.setSingleShot(true);
 207
 208         // Trigger the initial event manually. The default device has signals
 209         // which were created before this object came into being
 210         signals_changed();
 211
 212         // make sure the transparent widgets are on the top
 213         ruler_->raise();
 214         header_->raise();
 215
 216         reset_view_state();
 217 }
 218
 219 View::~View()
 220 {
 221         GlobalSettings::remove_change_handler(this);
 222 }
 223
 224 void View::reset_view_state()
 225 {
 226         ViewBase::reset_view_state();
 227
 228         segment_display_mode_ = Trace::ShowLastSegmentOnly;
 229         segment_selectable_ = false;
 230         scale_ = 1e-3;
 231         offset_ = 0;
 232         ruler_offset_ = 0;
 233         updating_scroll_ = false;
 234         settings_restored_ = false;
 235         always_zoom_to_fit_ = false;
 236         tick_period_ = 0;
 237         tick_prefix_ = pv::util::SIPrefix::yocto;
 238         tick_precision_ = 0;
 239         time_unit_ = util::TimeUnit::Time;
 240         show_cursors_ = false;
 241         cursors_ = make_shared<CursorPair>(*this);
 242         next_flag_text_ = 'A';
 243         trigger_markers_.clear();
 244         hover_widget_ = nullptr;
 245         hover_point_ = QPoint(-1, -1);
 246         scroll_needs_defaults_ = true;
 247         saved_v_offset_ = 0;
 248         scale_at_acq_start_ = 0;
 249         offset_at_acq_start_ = 0;
 250         suppress_zoom_to_fit_after_acq_ = false;
 251
 252         show_cursors_ = false;
 253         cursor_state_changed(show_cursors_);
 254         flags_.clear();
 255
 256         // Update the zoom state
 257         calculate_tick_spacing();
 258
 259         // Make sure the standard bar's segment selector is in sync
 260         set_segment_display_mode(segment_display_mode_);
 261 }
 262
 263 Session& View::session()
 264 {
 265         return session_;
 266 }
 267
 268 const Session& View::session() const
 269 {
 270         return session_;
 271 }
 272
 273 unordered_set< shared_ptr<Signal> > View::signals() const
 274 {
 275         return signals_;
 276 }
 277
 278 void View::clear_signals()
 279 {
 280         ViewBase::clear_signalbases();
 281         signals_.clear();
 282 }
 283
 284 void View::add_signal(const shared_ptr<Signal> signal)
 285 {
 286         ViewBase::add_signalbase(signal->base());
 287         signals_.insert(signal);
 288
 289         signal->set_segment_display_mode(segment_display_mode_);
 290         signal->set_current_segment(current_segment_);
 291
 292         connect(signal->base().get(), SIGNAL(name_changed(const QString&)),
 293                 this, SLOT(on_signal_name_changed()));
 294 }
 295
 296 #ifdef ENABLE_DECODE
 297 void View::clear_decode_signals()
 298 {
 299         decode_traces_.clear();
 300 }
 301
 302 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 303 {
 304         shared_ptr<DecodeTrace> d(
 305                 new DecodeTrace(session_, signal, decode_traces_.size()));
 306         decode_traces_.push_back(d);
 307
 308         d->set_segment_display_mode(segment_display_mode_);
 309         d->set_current_segment(current_segment_);
 310
 311         connect(signal.get(), SIGNAL(name_changed(const QString&)),
 312                 this, SLOT(on_signal_name_changed()));
 313 }
 314
 315 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 316 {
 317         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 318                 if ((*i)->base() == signal) {
 319                         decode_traces_.erase(i);
 320                         signals_changed();
 321                         return;
 322                 }
 323 }
 324 #endif
 325
 326 shared_ptr<Signal> View::get_signal_under_mouse_cursor() const
 327 {
 328         return signal_under_mouse_cursor_;
 329 }
 330
 331 View* View::view()
 332 {
 333         return this;
 334 }
 335
 336 const View* View::view() const
 337 {
 338         return this;
 339 }
 340
 341 Viewport* View::viewport()
 342 {
 343         return viewport_;
 344 }
 345
 346 const Viewport* View::viewport() const
 347 {
 348         return viewport_;
 349 }
 350
 351 const Ruler* View::ruler() const
 352 {
 353         return ruler_;
 354 }
 355
 356 void View::save_settings(QSettings &settings) const
 357 {
 358         settings.setValue("scale", scale_);
 359         settings.setValue("v_offset",
 360                 scrollarea_->verticalScrollBar()->sliderPosition());
 361
 362         settings.setValue("splitter_state", splitter_->saveState());
 363         settings.setValue("segment_display_mode", segment_display_mode_);
 364
 365         {
 366                 stringstream ss;
 367                 boost::archive::text_oarchive oa(ss);
 368                 oa << boost::serialization::make_nvp("ruler_shift", ruler_shift_);
 369                 settings.setValue("ruler_shift", QString::fromStdString(ss.str()));
 370         }
 371         {
 372                 stringstream ss;
 373                 boost::archive::text_oarchive oa(ss);
 374                 oa << boost::serialization::make_nvp("offset", offset_);
 375                 settings.setValue("offset", QString::fromStdString(ss.str()));
 376         }
 377
 378         for (const shared_ptr<Signal>& signal : signals_) {
 379                 settings.beginGroup(signal->base()->internal_name());
 380                 signal->save_settings(settings);
 381                 settings.endGroup();
 382         }
 383 }
 384
 385 void View::restore_settings(QSettings &settings)
 386 {
 387         // Note: It is assumed that this function is only called once,
 388         // immediately after restoring a previous session.
 389
 390         if (settings.contains("scale"))
 391                 set_scale(settings.value("scale").toDouble());
 392
 393         if (settings.contains("ruler_shift")) {
 394                 util::Timestamp shift;
 395                 stringstream ss;
 396                 ss << settings.value("ruler_shift").toString().toStdString();
 397
 398                 try {
 399                         boost::archive::text_iarchive ia(ss);
 400                         ia >> boost::serialization::make_nvp("ruler_shift", shift);
 401                         ruler_shift_ = shift;
 402                 } catch (boost::archive::archive_exception&) {
 403                         qDebug() << "Could not restore the view ruler shift";
 404                 }
 405         }
 406
 407         if (settings.contains("offset")) {
 408                 util::Timestamp offset;
 409                 stringstream ss;
 410                 ss << settings.value("offset").toString().toStdString();
 411
 412                 try {
 413                         boost::archive::text_iarchive ia(ss);
 414                         ia >> boost::serialization::make_nvp("offset", offset);
 415                         // This also updates ruler_offset_
 416                         set_offset(offset);
 417                 } catch (boost::archive::archive_exception&) {
 418                         qDebug() << "Could not restore the view offset";
 419                 }
 420         }
 421
 422         if (settings.contains("splitter_state"))
 423                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 424
 425         if (settings.contains("segment_display_mode"))
 426                 set_segment_display_mode(
 427                         (Trace::SegmentDisplayMode)(settings.value("segment_display_mode").toInt()));
 428
 429         for (shared_ptr<Signal> signal : signals_) {
 430                 settings.beginGroup(signal->base()->internal_name());
 431                 signal->restore_settings(settings);
 432                 settings.endGroup();
 433         }
 434
 435         if (settings.contains("v_offset")) {
 436                 saved_v_offset_ = settings.value("v_offset").toInt();
 437                 set_v_offset(saved_v_offset_);
 438                 scroll_needs_defaults_ = false;
 439                 // Note: see eventFilter() for additional information
 440         }
 441
 442         settings_restored_ = true;
 443         suppress_zoom_to_fit_after_acq_ = true;
 444
 445         // Update the ruler so that it uses the new scale
 446         calculate_tick_spacing();
 447 }
 448
 449 vector< shared_ptr<TimeItem> > View::time_items() const
 450 {
 451         const vector<shared_ptr<Flag>> f(flags());
 452         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 453
 454         if (cursors_) {
 455                 items.push_back(cursors_);
 456                 items.push_back(cursors_->first());
 457                 items.push_back(cursors_->second());
 458         }
 459
 460         for (auto& trigger_marker : trigger_markers_)
 461                 items.push_back(trigger_marker);
 462
 463         return items;
 464 }
 465
 466 double View::scale() const
 467 {
 468         return scale_;
 469 }
 470
 471 void View::set_scale(double scale)
 472 {
 473         if (scale_ != scale) {
 474                 scale_ = scale;
 475                 scale_changed();
 476         }
 477 }
 478
 479 void View::set_offset(const pv::util::Timestamp& offset, bool force_update)
 480 {
 481         if ((offset_ != offset) || force_update) {
 482                 offset_ = offset;
 483                 ruler_offset_ = offset_ + ruler_shift_;
 484                 offset_changed();
 485         }
 486 }
 487
 488 const Timestamp& View::offset() const
 489 {
 490         return offset_;
 491 }
 492
 493 const Timestamp& View::ruler_offset() const
 494 {
 495         return ruler_offset_;
 496 }
 497
 498 void View::set_zero_position(const pv::util::Timestamp& position)
 499 {
 500         // ruler shift is a negative offset and the new zero position is relative
 501         // to the current offset. Hence, we adjust the ruler shift only by the
 502         // difference.
 503         ruler_shift_ = -(position + (-ruler_shift_));
 504
 505         // Force an immediate update of the offsets
 506         set_offset(offset_, true);
 507         ruler_->update();
 508 }
 509
 510 void View::reset_zero_position()
 511 {
 512         ruler_shift_ = 0;
 513
 514         // Force an immediate update of the offsets
 515         set_offset(offset_, true);
 516         ruler_->update();
 517 }
 518
 519 int View::owner_visual_v_offset() const
 520 {
 521         return -scrollarea_->verticalScrollBar()->sliderPosition();
 522 }
 523
 524 void View::set_v_offset(int offset)
 525 {
 526         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 527         header_->update();
 528         viewport_->update();
 529 }
 530
 531 unsigned int View::depth() const
 532 {
 533         return 0;
 534 }
 535
 536 uint32_t View::current_segment() const
 537 {
 538         return current_segment_;
 539 }
 540
 541 pv::util::SIPrefix View::tick_prefix() const
 542 {
 543         return tick_prefix_;
 544 }
 545
 546 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 547 {
 548         if (tick_prefix_ != tick_prefix) {
 549                 tick_prefix_ = tick_prefix;
 550                 tick_prefix_changed();
 551         }
 552 }
 553
 554 unsigned int View::tick_precision() const
 555 {
 556         return tick_precision_;
 557 }
 558
 559 void View::set_tick_precision(unsigned tick_precision)
 560 {
 561         if (tick_precision_ != tick_precision) {
 562                 tick_precision_ = tick_precision;
 563                 tick_precision_changed();
 564         }
 565 }
 566
 567 const pv::util::Timestamp& View::tick_period() const
 568 {
 569         return tick_period_;
 570 }
 571
 572 unsigned int View::minor_tick_count() const
 573 {
 574         return minor_tick_count_;
 575 }
 576
 577 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 578 {
 579         if (tick_period_ != tick_period) {
 580                 tick_period_ = tick_period;
 581                 tick_period_changed();
 582         }
 583 }
 584
 585 TimeUnit View::time_unit() const
 586 {
 587         return time_unit_;
 588 }
 589
 590 void View::set_time_unit(pv::util::TimeUnit time_unit)
 591 {
 592         if (time_unit_ != time_unit) {
 593                 time_unit_ = time_unit;
 594                 time_unit_changed();
 595         }
 596 }
 597
 598 void View::set_current_segment(uint32_t segment_id)
 599 {
 600         current_segment_ = segment_id;
 601
 602         for (const shared_ptr<Signal>& signal : signals_)
 603                 signal->set_current_segment(current_segment_);
 604 #ifdef ENABLE_DECODE
 605         for (shared_ptr<DecodeTrace>& dt : decode_traces_)
 606                 dt->set_current_segment(current_segment_);
 607 #endif
 608
 609         vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
 610
 611         trigger_markers_.clear();
 612         for (util::Timestamp timestamp : triggers)
 613                 trigger_markers_.push_back(make_shared<TriggerMarker>(*this, timestamp));
 614
 615         // When enabled, the first trigger for this segment is used as the zero position
 616         GlobalSettings settings;
 617         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 618
 619         if (trigger_is_zero_time && (triggers.size() > 0))
 620                 set_zero_position(triggers.front());
 621
 622         viewport_->update();
 623
 624         segment_changed(segment_id);
 625 }
 626
 627 bool View::segment_is_selectable() const
 628 {
 629         return segment_selectable_;
 630 }
 631
 632 Trace::SegmentDisplayMode View::segment_display_mode() const
 633 {
 634         return segment_display_mode_;
 635 }
 636
 637 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 638 {
 639         segment_display_mode_ = mode;
 640
 641         for (const shared_ptr<Signal>& signal : signals_)
 642                 signal->set_segment_display_mode(mode);
 643
 644         uint32_t last_segment = session_.get_segment_count() - 1;
 645
 646         switch (mode) {
 647         case Trace::ShowLastSegmentOnly:
 648                 if (current_segment_ != last_segment)
 649                         set_current_segment(last_segment);
 650                 break;
 651
 652         case Trace::ShowLastCompleteSegmentOnly:
 653                 // Do nothing if we only have one segment so far
 654                 if (last_segment > 0) {
 655                         // If the last segment isn't complete, the previous one must be
 656                         uint32_t segment_id =
 657                                 (session_.all_segments_complete(last_segment)) ?
 658                                 last_segment : last_segment - 1;
 659
 660                         if (current_segment_ != segment_id)
 661                                 set_current_segment(segment_id);
 662                 }
 663                 break;
 664
 665         case Trace::ShowSingleSegmentOnly:
 666         case Trace::ShowAllSegments:
 667         case Trace::ShowAccumulatedIntensity:
 668         default:
 669                 // Current segment remains as-is
 670                 break;
 671         }
 672
 673         segment_selectable_ = true;
 674
 675         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 676                 segment_selectable_ = false;
 677
 678         viewport_->update();
 679
 680         segment_display_mode_changed((int)mode, segment_selectable_);
 681 }
 682
 683 void View::zoom(double steps)
 684 {
 685         zoom(steps, viewport_->width() / 2);
 686 }
 687
 688 void View::zoom(double steps, int offset)
 689 {
 690         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 691 }
 692
 693 void View::zoom_fit(bool gui_state)
 694 {
 695         // Act as one-shot when stopped, toggle along with the GUI otherwise
 696         if (session_.get_capture_state() == Session::Stopped) {
 697                 always_zoom_to_fit_ = false;
 698                 always_zoom_to_fit_changed(false);
 699         } else {
 700                 always_zoom_to_fit_ = gui_state;
 701                 always_zoom_to_fit_changed(gui_state);
 702         }
 703
 704         const pair<Timestamp, Timestamp> extents = get_time_extents();
 705         const Timestamp delta = extents.second - extents.first;
 706         if (delta < Timestamp("1e-12"))
 707                 return;
 708
 709         assert(viewport_);
 710         const int w = viewport_->width();
 711         if (w <= 0)
 712                 return;
 713
 714         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 715         set_scale_offset(scale.convert_to<double>(), extents.first);
 716 }
 717
 718 void View::set_scale_offset(double scale, const Timestamp& offset)
 719 {
 720         // Disable sticky scrolling / always zoom to fit when acquisition runs
 721         // and user drags the viewport
 722         if ((scale_ == scale) && (offset_ != offset) &&
 723                         (session_.get_capture_state() == Session::Running)) {
 724
 725                 if (sticky_scrolling_) {
 726                         sticky_scrolling_ = false;
 727                         sticky_scrolling_changed(false);
 728                 }
 729
 730                 if (always_zoom_to_fit_) {
 731                         always_zoom_to_fit_ = false;
 732                         always_zoom_to_fit_changed(false);
 733                 }
 734         }
 735
 736         set_scale(scale);
 737         set_offset(offset);
 738
 739         calculate_tick_spacing();
 740
 741         update_scroll();
 742         ruler_->update();
 743         viewport_->update();
 744 }
 745
 746 set< shared_ptr<SignalData> > View::get_visible_data() const
 747 {
 748         // Make a set of all the visible data objects
 749         set< shared_ptr<SignalData> > visible_data;
 750         for (const shared_ptr<Signal>& sig : signals_)
 751                 if (sig->enabled())
 752                         visible_data.insert(sig->data());
 753
 754         return visible_data;
 755 }
 756
 757 pair<Timestamp, Timestamp> View::get_time_extents() const
 758 {
 759         boost::optional<Timestamp> left_time, right_time;
 760         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 761         for (const shared_ptr<SignalData>& d : visible_data) {
 762                 const vector< shared_ptr<Segment> > segments = d->segments();
 763                 for (const shared_ptr<Segment>& s : segments) {
 764                         double samplerate = s->samplerate();
 765                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 766
 767                         const Timestamp start_time = s->start_time();
 768                         left_time = left_time ?
 769                                 min(*left_time, start_time) :
 770                                                 start_time;
 771                         right_time = right_time ?
 772                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 773                                                  start_time + d->max_sample_count() / samplerate;
 774                 }
 775         }
 776
 777         if (!left_time || !right_time)
 778                 return make_pair(0, 0);
 779
 780         assert(*left_time < *right_time);
 781         return make_pair(*left_time, *right_time);
 782 }
 783
 784 void View::enable_show_sampling_points(bool state)
 785 {
 786         (void)state;
 787
 788         viewport_->update();
 789 }
 790
 791 void View::enable_show_analog_minor_grid(bool state)
 792 {
 793         (void)state;
 794
 795         viewport_->update();
 796 }
 797
 798 void View::enable_colored_bg(bool state)
 799 {
 800         colored_bg_ = state;
 801         viewport_->update();
 802 }
 803
 804 bool View::colored_bg() const
 805 {
 806         return colored_bg_;
 807 }
 808
 809 bool View::cursors_shown() const
 810 {
 811         return show_cursors_;
 812 }
 813
 814 void View::show_cursors(bool show)
 815 {
 816         show_cursors_ = show;
 817         cursor_state_changed(show);
 818         ruler_->update();
 819         viewport_->update();
 820 }
 821
 822 void View::centre_cursors()
 823 {
 824         if (cursors_) {
 825                 const double time_width = scale_ * viewport_->width();
 826                 cursors_->first()->set_time(offset_ + time_width * 0.4);
 827                 cursors_->second()->set_time(offset_ + time_width * 0.6);
 828
 829                 ruler_->update();
 830                 viewport_->update();
 831         }
 832 }
 833
 834 shared_ptr<CursorPair> View::cursors() const
 835 {
 836         return cursors_;
 837 }
 838
 839 void View::add_flag(const Timestamp& time)
 840 {
 841         flags_.push_back(make_shared<Flag>(*this, time,
 842                 QString("%1").arg(next_flag_text_)));
 843
 844         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 845                 (next_flag_text_ + 1);
 846
 847         time_item_appearance_changed(true, true);
 848 }
 849
 850 void View::remove_flag(shared_ptr<Flag> flag)
 851 {
 852         flags_.remove(flag);
 853         time_item_appearance_changed(true, true);
 854 }
 855
 856 vector< shared_ptr<Flag> > View::flags() const
 857 {
 858         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 859         stable_sort(flags.begin(), flags.end(),
 860                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 861                         return a->time() < b->time();
 862                 });
 863
 864         return flags;
 865 }
 866
 867 const QPoint& View::hover_point() const
 868 {
 869         return hover_point_;
 870 }
 871
 872 const QWidget* View::hover_widget() const
 873 {
 874         return hover_widget_;
 875 }
 876
 877 int64_t View::get_nearest_level_change(const QPoint &p)
 878 {
 879         // Is snapping disabled?
 880         if (snap_distance_ == 0)
 881                 return -1;
 882
 883         struct entry_t {
 884                 entry_t(shared_ptr<Signal> s) :
 885                         signal(s), delta(numeric_limits<int64_t>::max()), sample(-1), is_dense(false) {}
 886                 shared_ptr<Signal> signal;
 887                 int64_t delta;
 888                 int64_t sample;
 889                 bool is_dense;
 890         };
 891
 892         vector<entry_t> list;
 893
 894         // Create list of signals to consider
 895         if (signal_under_mouse_cursor_)
 896                 list.emplace_back(signal_under_mouse_cursor_);
 897         else
 898                 for (shared_ptr<Signal> s : signals_) {
 899                         if (!s->enabled())
 900                                 continue;
 901
 902                         list.emplace_back(s);
 903                 }
 904
 905         // Get data for listed signals
 906         for (entry_t &e : list) {
 907                 // Calculate sample number from cursor position
 908                 const double samples_per_pixel = e.signal->base()->get_samplerate() * scale();
 909                 const int64_t x_offset = offset().convert_to<double>() / scale();
 910                 const int64_t sample_num = max(((x_offset + p.x()) * samples_per_pixel), 0.0);
 911
 912                 vector<data::LogicSegment::EdgePair> edges =
 913                         e.signal->get_nearest_level_changes(sample_num);
 914
 915                 if (edges.empty())
 916                         continue;
 917
 918                 // Check first edge
 919                 const int64_t first_sample_delta = abs(sample_num - edges.front().first);
 920                 const int64_t first_delta = first_sample_delta / samples_per_pixel;
 921                 e.delta = first_delta;
 922                 e.sample = edges.front().first;
 923
 924                 // Check second edge if available
 925                 if (edges.size() == 2) {
 926                         // Note: -1 because this is usually the right edge and sample points are left-aligned
 927                         const int64_t second_sample_delta = abs(sample_num - edges.back().first - 1);
 928                         const int64_t second_delta = second_sample_delta / samples_per_pixel;
 929
 930                         // If both edges are too close, we mark this signal as being dense
 931                         if ((first_delta + second_delta) <= snap_distance_)
 932                                 e.is_dense = true;
 933
 934                         if (second_delta < first_delta) {
 935                                 e.delta = second_delta;
 936                                 e.sample = edges.back().first;
 937                         }
 938                 }
 939         }
 940
 941         // Look for the best match: non-dense first, then dense
 942         entry_t *match = nullptr;
 943
 944         for (entry_t &e : list) {
 945                 if (e.delta > snap_distance_ || e.is_dense)
 946                         continue;
 947
 948                 if (match) {
 949                         if (e.delta < match->delta)
 950                                 match = &e;
 951                 } else
 952                         match = &e;
 953         }
 954
 955         if (!match) {
 956                 for (entry_t &e : list) {
 957                         if (!e.is_dense)
 958                                 continue;
 959
 960                         if (match) {
 961                                 if (e.delta < match->delta)
 962                                         match = &e;
 963                         } else
 964                                 match = &e;
 965                 }
 966         }
 967
 968         if (match) {
 969                 // Somewhat ugly hack to make TimeItem::drag_by() work
 970                 signal_under_mouse_cursor_ = match->signal;
 971
 972                 return match->sample;
 973         }
 974
 975         return -1;
 976 }
 977
 978 void View::restack_all_trace_tree_items()
 979 {
 980         // Make a list of owners that is sorted from deepest first
 981         const vector<shared_ptr<TraceTreeItem>> items(
 982                 list_by_type<TraceTreeItem>());
 983         set< TraceTreeItemOwner* > owners;
 984         for (const auto &r : items)
 985                 owners.insert(r->owner());
 986         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 987         sort(sorted_owners.begin(), sorted_owners.end(),
 988                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 989                         return a->depth() > b->depth(); });
 990
 991         // Restack the items recursively
 992         for (auto &o : sorted_owners)
 993                 o->restack_items();
 994
 995         // Animate the items to their destination
 996         for (const auto &i : items)
 997                 i->animate_to_layout_v_offset();
 998 }
 999
1000 int View::header_width() const
1001 {
1002          return header_->extended_size_hint().width();
1003 }
1004
1005 void View::on_setting_changed(const QString &key, const QVariant &value)
1006 {
1007         if (key == GlobalSettings::Key_View_TriggerIsZeroTime)
1008                 on_settingViewTriggerIsZeroTime_changed(value);
1009
1010         if (key == GlobalSettings::Key_View_SnapDistance) {
1011                 GlobalSettings settings;
1012                 snap_distance_ = settings.value(GlobalSettings::Key_View_SnapDistance).toInt();
1013         }
1014 }
1015
1016 void View::trigger_event(int segment_id, util::Timestamp location)
1017 {
1018         // TODO This doesn't work if we're showing multiple segments at once
1019         if ((uint32_t)segment_id != current_segment_)
1020                 return;
1021
1022         // Set zero location if the Key_View_TriggerIsZeroTime setting is set and
1023         // if this is the first trigger for this segment.
1024         GlobalSettings settings;
1025         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
1026
1027         size_t trigger_count = session_.get_triggers(current_segment_).size();
1028
1029         if (trigger_is_zero_time && trigger_count == 1)
1030                 set_zero_position(location);
1031
1032         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
1033 }
1034
1035 void View::get_scroll_layout(double &length, Timestamp &offset) const
1036 {
1037         const pair<Timestamp, Timestamp> extents = get_time_extents();
1038         length = ((extents.second - extents.first) / scale_).convert_to<double>();
1039         offset = offset_ / scale_;
1040 }
1041
1042 void View::set_zoom(double scale, int offset)
1043 {
1044         // Reset the "always zoom to fit" feature as the user changed the zoom
1045         always_zoom_to_fit_ = false;
1046         always_zoom_to_fit_changed(false);
1047
1048         const Timestamp cursor_offset = offset_ + scale_ * offset;
1049         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
1050         const Timestamp new_offset = cursor_offset - new_scale * offset;
1051         set_scale_offset(new_scale.convert_to<double>(), new_offset);
1052 }
1053
1054 void View::calculate_tick_spacing()
1055 {
1056         const double SpacingIncrement = 10.0f;
1057         const double MinValueSpacing = 40.0f;
1058
1059         // Figure out the highest numeric value visible on a label
1060         const QSize areaSize = viewport_->size();
1061         const Timestamp max_time = max(fabs(offset_),
1062                 fabs(offset_ + scale_ * areaSize.width()));
1063
1064         double min_width = SpacingIncrement;
1065         double label_width, tick_period_width;
1066
1067         QFontMetrics m(QApplication::font());
1068
1069         // Copies of the member variables with the same name, used in the calculation
1070         // and written back afterwards, so that we don't emit signals all the time
1071         // during the calculation.
1072         pv::util::Timestamp tick_period = tick_period_;
1073         pv::util::SIPrefix tick_prefix = tick_prefix_;
1074         unsigned tick_precision = tick_precision_;
1075
1076         do {
1077                 const double min_period = scale_ * min_width;
1078
1079                 const int order = (int)floorf(log10f(min_period));
1080                 const pv::util::Timestamp order_decimal =
1081                         pow(pv::util::Timestamp(10), order);
1082
1083                 // Allow for a margin of error so that a scale unit of 1 can be used.
1084                 // Otherwise, for a SU of 1 the tick period will almost always be below
1085                 // the min_period by a small amount - and thus skipped in favor of 2.
1086                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
1087                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
1088                 double tp_with_margin;
1089                 unsigned int unit = 0;
1090
1091                 do {
1092                         tp_with_margin = order_decimal.convert_to<double>() *
1093                                 (ScaleUnits[unit++] + tp_margin);
1094                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
1095
1096                 minor_tick_count_ = (unit == 2) ? 4 : 5;
1097                 tick_period = order_decimal * ScaleUnits[unit - 1];
1098                 tick_prefix = static_cast<pv::util::SIPrefix>(
1099                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
1100
1101                 // Precision is the number of fractional digits required, not
1102                 // taking the prefix into account (and it must never be negative)
1103                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
1104
1105                 tick_period_width = (tick_period / scale_).convert_to<double>();
1106
1107                 const QString label_text = Ruler::format_time_with_distance(
1108                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
1109
1110                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
1111                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
1112                                 MinValueSpacing;
1113
1114                 min_width += SpacingIncrement;
1115         } while (tick_period_width < label_width);
1116
1117         set_tick_period(tick_period);
1118         set_tick_prefix(tick_prefix);
1119         set_tick_precision(tick_precision);
1120 }
1121
1122 void View::adjust_top_margin()
1123 {
1124         assert(viewport_);
1125
1126         const QSize areaSize = viewport_->size();
1127
1128         const pair<int, int> extents = v_extents();
1129         const int top_margin = owner_visual_v_offset() + extents.first;
1130         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
1131
1132         // Do we have empty space at the top while the last trace goes out of screen?
1133         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
1134                 const int trace_height = extents.second - extents.first;
1135
1136                 // Center everything vertically if there is enough space
1137                 if (areaSize.height() >= trace_height)
1138                         set_v_offset(extents.first -
1139                                 ((areaSize.height() - trace_height) / 2));
1140                 else
1141                         // Remove the top margin to make as many traces fit on screen as possible
1142                         set_v_offset(extents.first);
1143         }
1144 }
1145
1146 void View::update_scroll()
1147 {
1148         assert(viewport_);
1149         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
1150         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
1151
1152         const QSize areaSize = viewport_->size();
1153
1154         // Set the horizontal scroll bar
1155         double length = 0;
1156         Timestamp offset;
1157         get_scroll_layout(length, offset);
1158         length = max(length - areaSize.width(), 0.0);
1159
1160         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
1161
1162         hscrollbar->setPageStep(areaSize.width() / 2);
1163         hscrollbar->setSingleStep(major_tick_distance);
1164
1165         updating_scroll_ = true;
1166
1167         if (length < MaxScrollValue) {
1168                 hscrollbar->setRange(0, length);
1169                 hscrollbar->setSliderPosition(offset.convert_to<double>());
1170         } else {
1171                 hscrollbar->setRange(0, MaxScrollValue);
1172                 hscrollbar->setSliderPosition(
1173                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
1174         }
1175
1176         updating_scroll_ = false;
1177
1178         // Set the vertical scrollbar
1179         vscrollbar->setPageStep(areaSize.height());
1180         vscrollbar->setSingleStep(areaSize.height() / 8);
1181
1182         const pair<int, int> extents = v_extents();
1183
1184         // Don't change the scrollbar range if there are no traces
1185         if (extents.first != extents.second)
1186                 vscrollbar->setRange(extents.first - areaSize.height(),
1187                         extents.second);
1188
1189         if (scroll_needs_defaults_) {
1190                 set_scroll_default();
1191                 scroll_needs_defaults_ = false;
1192         }
1193 }
1194
1195 void View::reset_scroll()
1196 {
1197         scrollarea_->verticalScrollBar()->setRange(0, 0);
1198 }
1199
1200 void View::set_scroll_default()
1201 {
1202         assert(viewport_);
1203
1204         const QSize areaSize = viewport_->size();
1205
1206         const pair<int, int> extents = v_extents();
1207         const int trace_height = extents.second - extents.first;
1208
1209         // Do all traces fit in the view?
1210         if (areaSize.height() >= trace_height)
1211                 // Center all traces vertically
1212                 set_v_offset(extents.first -
1213                         ((areaSize.height() - trace_height) / 2));
1214         else
1215                 // Put the first trace at the top, letting the bottom ones overflow
1216                 set_v_offset(extents.first);
1217 }
1218
1219 void View::determine_if_header_was_shrunk()
1220 {
1221         const int header_pane_width =
1222                 splitter_->sizes().front();  // clazy:exclude=detaching-temporary
1223
1224         // Allow for a slight margin of error so that we also accept
1225         // slight differences when e.g. a label name change increased
1226         // the overall width
1227         header_was_shrunk_ = (header_pane_width < (header_width() - 10));
1228 }
1229
1230 void View::resize_header_to_fit()
1231 {
1232         // Setting the maximum width of the header widget doesn't work as
1233         // expected because the splitter would allow the user to make the
1234         // pane wider than that, creating empty space as a result.
1235         // To make this work, we stricly enforce the maximum width by
1236         // expanding the header unless the user shrunk it on purpose.
1237         // As we're then setting the width of the header pane, we set the
1238         // splitter to the maximum allowed position.
1239
1240         int splitter_area_width = 0;
1241         for (int w : splitter_->sizes())  // clazy:exclude=range-loop
1242                 splitter_area_width += w;
1243
1244         // Make sure the header has enough horizontal space to show all labels fully
1245         QList<int> pane_sizes;
1246         pane_sizes.push_back(header_->extended_size_hint().width());
1247         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1248         splitter_->setSizes(pane_sizes);
1249 }
1250
1251 void View::update_layout()
1252 {
1253         update_scroll();
1254 }
1255
1256 TraceTreeItemOwner* View::find_prevalent_trace_group(
1257         const shared_ptr<sigrok::ChannelGroup> &group,
1258         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1259                 &signal_map)
1260 {
1261         assert(group);
1262
1263         unordered_set<TraceTreeItemOwner*> owners;
1264         vector<TraceTreeItemOwner*> owner_list;
1265
1266         // Make a set and a list of all the owners
1267         for (const auto& channel : group->channels()) {
1268                 for (auto& entry : signal_map) {
1269                         if (entry.first->channel() == channel) {
1270                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1271                                 owner_list.push_back(o);
1272                                 owners.insert(o);
1273                         }
1274                 }
1275         }
1276
1277         // Iterate through the list of owners, and find the most prevalent
1278         size_t max_prevalence = 0;
1279         TraceTreeItemOwner *prevalent_owner = nullptr;
1280         for (TraceTreeItemOwner *owner : owners) {
1281                 const size_t prevalence = count_if(
1282                         owner_list.begin(), owner_list.end(),
1283                         [&](TraceTreeItemOwner *o) { return o == owner; });
1284                 if (prevalence > max_prevalence) {
1285                         max_prevalence = prevalence;
1286                         prevalent_owner = owner;
1287                 }
1288         }
1289
1290         return prevalent_owner;
1291 }
1292
1293 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1294         const vector< shared_ptr<sigrok::Channel> > &channels,
1295         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1296                 &signal_map,
1297         set< shared_ptr<Trace> > &add_list)
1298 {
1299         vector< shared_ptr<Trace> > filtered_traces;
1300
1301         for (const auto& channel : channels) {
1302                 for (auto& entry : signal_map) {
1303                         if (entry.first->channel() == channel) {
1304                                 shared_ptr<Trace> trace = entry.second;
1305                                 const auto list_iter = add_list.find(trace);
1306                                 if (list_iter == add_list.end())
1307                                         continue;
1308
1309                                 filtered_traces.push_back(trace);
1310                                 add_list.erase(list_iter);
1311                         }
1312                 }
1313         }
1314
1315         return filtered_traces;
1316 }
1317
1318 void View::determine_time_unit()
1319 {
1320         // Check whether we know the sample rate and hence can use time as the unit
1321         if (time_unit_ == util::TimeUnit::Samples) {
1322                 // Check all signals but...
1323                 for (const shared_ptr<Signal>& signal : signals_) {
1324                         const shared_ptr<SignalData> data = signal->data();
1325
1326                         // ...only check first segment of each
1327                         const vector< shared_ptr<Segment> > segments = data->segments();
1328                         if (!segments.empty())
1329                                 if (segments[0]->samplerate()) {
1330                                         set_time_unit(util::TimeUnit::Time);
1331                                         break;
1332                                 }
1333                 }
1334         }
1335 }
1336
1337 bool View::eventFilter(QObject *object, QEvent *event)
1338 {
1339         const QEvent::Type type = event->type();
1340         if (type == QEvent::MouseMove) {
1341
1342                 if (object)
1343                         hover_widget_ = qobject_cast<QWidget*>(object);
1344
1345                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1346                 if (object == viewport_)
1347                         hover_point_ = mouse_event->pos();
1348                 else if (object == ruler_)
1349                         hover_point_ = mouse_event->pos();
1350                 else if (object == header_)
1351                         hover_point_ = QPoint(0, mouse_event->y());
1352                 else
1353                         hover_point_ = QPoint(-1, -1);
1354
1355                 update_hover_point();
1356
1357         } else if (type == QEvent::Leave) {
1358                 hover_point_ = QPoint(-1, -1);
1359                 update_hover_point();
1360         } else if (type == QEvent::Show) {
1361
1362                 // This is somewhat of a hack, unfortunately. We cannot use
1363                 // set_v_offset() from within restore_settings() as the view
1364                 // at that point is neither visible nor properly sized.
1365                 // This is the least intrusive workaround I could come up
1366                 // with: set the vertical offset (or scroll defaults) when
1367                 // the view is shown, which happens after all widgets were
1368                 // resized to their final sizes.
1369                 update_layout();
1370
1371                 if (settings_restored_)
1372                         determine_if_header_was_shrunk();
1373                 else
1374                         resize_header_to_fit();
1375
1376                 if (scroll_needs_defaults_) {
1377                         set_scroll_default();
1378                         scroll_needs_defaults_ = false;
1379                 }
1380
1381                 if (saved_v_offset_) {
1382                         set_v_offset(saved_v_offset_);
1383                         saved_v_offset_ = 0;
1384                 }
1385         }
1386
1387         return QObject::eventFilter(object, event);
1388 }
1389
1390 void View::contextMenuEvent(QContextMenuEvent *event)
1391 {
1392         QPoint pos = event->pos() - QPoint(0, ruler_->sizeHint().height());
1393
1394         const shared_ptr<ViewItem> r = viewport_->get_mouse_over_item(pos);
1395         if (!r)
1396                 return;
1397
1398         QMenu *menu = r->create_view_context_menu(this, pos);
1399         if (menu)
1400                 menu->popup(event->globalPos());
1401 }
1402
1403 void View::resizeEvent(QResizeEvent* event)
1404 {
1405         // Only adjust the top margin if we shrunk vertically
1406         if (event->size().height() < event->oldSize().height())
1407                 adjust_top_margin();
1408
1409         update_layout();
1410 }
1411
1412 void View::update_hover_point()
1413 {
1414         // Determine signal that the mouse cursor is hovering over
1415         signal_under_mouse_cursor_.reset();
1416         if (hover_widget_ == this) {
1417                 for (const shared_ptr<Signal>& s : signals_) {
1418                         const pair<int, int> extents = s->v_extents();
1419                         const int top = s->get_visual_y() + extents.first;
1420                         const int btm = s->get_visual_y() + extents.second;
1421                         if ((hover_point_.y() >= top) && (hover_point_.y() <= btm)
1422                                 && s->base()->enabled())
1423                                 signal_under_mouse_cursor_ = s;
1424                 }
1425         }
1426
1427         // Update all trace tree items
1428         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1429                 list_by_type<TraceTreeItem>());
1430         for (const shared_ptr<TraceTreeItem>& r : trace_tree_items)
1431                 r->hover_point_changed(hover_point_);
1432
1433         // Notify any other listeners
1434         hover_point_changed(hover_widget_, hover_point_);
1435 }
1436
1437 void View::row_item_appearance_changed(bool label, bool content)
1438 {
1439         if (label)
1440                 header_->update();
1441         if (content)
1442                 viewport_->update();
1443 }
1444
1445 void View::time_item_appearance_changed(bool label, bool content)
1446 {
1447         if (label) {
1448                 ruler_->update();
1449
1450                 // Make sure the header pane width is updated, too
1451                 update_layout();
1452         }
1453
1454         if (content)
1455                 viewport_->update();
1456 }
1457
1458 void View::extents_changed(bool horz, bool vert)
1459 {
1460         sticky_events_ |=
1461                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1462                 (vert ? TraceTreeItemVExtentsChanged : 0);
1463
1464         lazy_event_handler_.stop();
1465         lazy_event_handler_.start();
1466 }
1467
1468 void View::on_signal_name_changed()
1469 {
1470         if (!header_was_shrunk_)
1471                 resize_header_to_fit();
1472 }
1473
1474 void View::on_splitter_moved()
1475 {
1476         // The header can only shrink when the splitter is moved manually
1477         determine_if_header_was_shrunk();
1478
1479         if (!header_was_shrunk_)
1480                 resize_header_to_fit();
1481 }
1482
1483 void View::h_scroll_value_changed(int value)
1484 {
1485         if (updating_scroll_)
1486                 return;
1487
1488         // Disable sticky scrolling when user moves the horizontal scroll bar
1489         // during a running acquisition
1490         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1491                 sticky_scrolling_ = false;
1492                 sticky_scrolling_changed(false);
1493         }
1494
1495         const int range = scrollarea_->horizontalScrollBar()->maximum();
1496         if (range < MaxScrollValue)
1497                 set_offset(scale_ * value);
1498         else {
1499                 double length = 0;
1500                 Timestamp offset;
1501                 get_scroll_layout(length, offset);
1502                 set_offset(scale_ * length * value / MaxScrollValue);
1503         }
1504
1505         ruler_->update();
1506         viewport_->update();
1507 }
1508
1509 void View::v_scroll_value_changed()
1510 {
1511         header_->update();
1512         viewport_->update();
1513 }
1514
1515 void View::signals_changed()
1516 {
1517         using sigrok::Channel;
1518
1519         vector< shared_ptr<Channel> > channels;
1520         shared_ptr<sigrok::Device> sr_dev;
1521         bool signals_added_or_removed = false;
1522
1523         // Do we need to set the vertical scrollbar to its default position later?
1524         // We do if there are no traces, i.e. the scroll bar has no range set
1525         bool reset_scrollbar =
1526                 (scrollarea_->verticalScrollBar()->minimum() ==
1527                         scrollarea_->verticalScrollBar()->maximum());
1528
1529         if (!session_.device()) {
1530                 reset_scroll();
1531                 signals_.clear();
1532         } else {
1533                 sr_dev = session_.device()->device();
1534                 assert(sr_dev);
1535                 channels = sr_dev->channels();
1536         }
1537
1538         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1539
1540         // Make a list of traces that are being added, and a list of traces
1541         // that are being removed
1542         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1543         const set<shared_ptr<Trace>> prev_traces(
1544                 prev_trace_list.begin(), prev_trace_list.end());
1545
1546         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1547
1548 #ifdef ENABLE_DECODE
1549         traces.insert(decode_traces_.begin(), decode_traces_.end());
1550 #endif
1551
1552         set< shared_ptr<Trace> > add_traces;
1553         set_difference(traces.begin(), traces.end(),
1554                 prev_traces.begin(), prev_traces.end(),
1555                 inserter(add_traces, add_traces.begin()));
1556
1557         set< shared_ptr<Trace> > remove_traces;
1558         set_difference(prev_traces.begin(), prev_traces.end(),
1559                 traces.begin(), traces.end(),
1560                 inserter(remove_traces, remove_traces.begin()));
1561
1562         // Make a look-up table of sigrok Channels to pulseview Signals
1563         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1564                 signal_map;
1565         for (const shared_ptr<Signal>& sig : signals_)
1566                 signal_map[sig->base()] = sig;
1567
1568         // Populate channel groups
1569         if (sr_dev)
1570                 for (auto& entry : sr_dev->channel_groups()) {
1571                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1572
1573                         if (group->channels().size() <= 1)
1574                                 continue;
1575
1576                         // Find best trace group to add to
1577                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1578                                 group, signal_map);
1579
1580                         // If there is no trace group, create one
1581                         shared_ptr<TraceGroup> new_trace_group;
1582                         if (!owner) {
1583                                 new_trace_group.reset(new TraceGroup());
1584                                 owner = new_trace_group.get();
1585                         }
1586
1587                         // Extract traces for the trace group, removing them from
1588                         // the add list
1589                         const vector< shared_ptr<Trace> > new_traces_in_group =
1590                                 extract_new_traces_for_channels(group->channels(),
1591                                         signal_map, add_traces);
1592
1593                         // Add the traces to the group
1594                         const pair<int, int> prev_v_extents = owner->v_extents();
1595                         int offset = prev_v_extents.second - prev_v_extents.first;
1596                         for (const shared_ptr<Trace>& trace : new_traces_in_group) {
1597                                 assert(trace);
1598                                 owner->add_child_item(trace);
1599
1600                                 const pair<int, int> extents = trace->v_extents();
1601                                 if (trace->enabled())
1602                                         offset += -extents.first;
1603                                 trace->force_to_v_offset(offset);
1604                                 if (trace->enabled())
1605                                         offset += extents.second;
1606                         }
1607
1608                         if (new_trace_group) {
1609                                 // Assign proper vertical offsets to each channel in the group
1610                                 new_trace_group->restack_items();
1611
1612                                 // If this is a new group, enqueue it in the new top level
1613                                 // items list
1614                                 if (!new_traces_in_group.empty())
1615                                         new_top_level_items.push_back(new_trace_group);
1616                         }
1617                 }
1618
1619         // Enqueue the remaining logic channels in a group
1620         vector< shared_ptr<Channel> > logic_channels;
1621         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1622                 [](const shared_ptr<Channel>& c) {
1623                         return c->type() == sigrok::ChannelType::LOGIC; });
1624
1625         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1626                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1627
1628         if (non_grouped_logic_signals.size() > 0) {
1629                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1630                         make_shared<TraceGroup>());
1631                 for (const shared_ptr<Trace>& trace : non_grouped_logic_signals)
1632                         non_grouped_trace_group->add_child_item(trace);
1633
1634                 non_grouped_trace_group->restack_items();
1635                 new_top_level_items.push_back(non_grouped_trace_group);
1636         }
1637
1638         // Enqueue the remaining channels as free ungrouped traces
1639         const vector< shared_ptr<Trace> > new_top_level_signals =
1640                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1641         new_top_level_items.insert(new_top_level_items.end(),
1642                 new_top_level_signals.begin(), new_top_level_signals.end());
1643
1644         // Enqueue any remaining traces i.e. decode traces
1645         new_top_level_items.insert(new_top_level_items.end(),
1646                 add_traces.begin(), add_traces.end());
1647
1648         // Remove any removed traces
1649         for (const shared_ptr<Trace>& trace : remove_traces) {
1650                 TraceTreeItemOwner *const owner = trace->owner();
1651                 assert(owner);
1652                 owner->remove_child_item(trace);
1653                 signals_added_or_removed = true;
1654         }
1655
1656         // Remove any empty trace groups
1657         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1658                 if (group->child_items().size() == 0) {
1659                         remove_child_item(group);
1660                         group.reset();
1661                 }
1662
1663         // Add and position the pending top levels items
1664         int offset = v_extents().second;
1665         for (auto item : new_top_level_items) {
1666                 add_child_item(item);
1667
1668                 // Position the item after the last item or at the top if there is none
1669                 const pair<int, int> extents = item->v_extents();
1670
1671                 if (item->enabled())
1672                         offset += -extents.first;
1673
1674                 item->force_to_v_offset(offset);
1675
1676                 if (item->enabled())
1677                         offset += extents.second;
1678                 signals_added_or_removed = true;
1679         }
1680
1681
1682         if (signals_added_or_removed && !header_was_shrunk_)
1683                 resize_header_to_fit();
1684
1685         update_layout();
1686
1687         header_->update();
1688         viewport_->update();
1689
1690         if (reset_scrollbar)
1691                 set_scroll_default();
1692 }
1693
1694 void View::capture_state_updated(int state)
1695 {
1696         GlobalSettings settings;
1697
1698         if (state == Session::Running) {
1699                 set_time_unit(util::TimeUnit::Samples);
1700
1701                 trigger_markers_.clear();
1702
1703                 scale_at_acq_start_ = scale_;
1704                 offset_at_acq_start_ = offset_;
1705
1706                 // Activate "always zoom to fit" if the setting is enabled and we're
1707                 // the main view of this session (other trace views may be used for
1708                 // zooming and we don't want to mess them up)
1709                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1710                 if (is_main_view_ && state) {
1711                         always_zoom_to_fit_ = true;
1712                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1713                 }
1714
1715                 // Enable sticky scrolling if the setting is enabled
1716                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1717
1718                 // Reset all traces to segment 0
1719                 current_segment_ = 0;
1720                 set_current_segment(current_segment_);
1721         }
1722
1723         if (state == Session::Stopped) {
1724                 // After acquisition has stopped we need to re-calculate the ticks once
1725                 // as it's otherwise done when the user pans or zooms, which is too late
1726                 calculate_tick_spacing();
1727
1728                 // Reset "always zoom to fit", the acquisition has stopped
1729                 if (always_zoom_to_fit_) {
1730                         // Perform a final zoom-to-fit before disabling
1731                         zoom_fit(always_zoom_to_fit_);
1732                         always_zoom_to_fit_ = false;
1733                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1734                 }
1735
1736                 bool zoom_to_fit_after_acq =
1737                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1738
1739                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1740                 // we didn't restore settings in the meanwhile
1741                 if (zoom_to_fit_after_acq &&
1742                         !suppress_zoom_to_fit_after_acq_ &&
1743                         (scale_ == scale_at_acq_start_) &&
1744                         (offset_ == offset_at_acq_start_))
1745                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1746
1747                 suppress_zoom_to_fit_after_acq_ = false;
1748         }
1749 }
1750
1751 void View::on_new_segment(int new_segment_id)
1752 {
1753         on_segment_changed(new_segment_id);
1754 }
1755
1756 void View::on_segment_completed(int segment_id)
1757 {
1758         on_segment_changed(segment_id);
1759 }
1760
1761 void View::on_segment_changed(int segment)
1762 {
1763         switch (segment_display_mode_) {
1764         case Trace::ShowLastSegmentOnly:
1765         case Trace::ShowSingleSegmentOnly:
1766                 set_current_segment(segment);
1767                 break;
1768
1769         case Trace::ShowLastCompleteSegmentOnly:
1770                 // Only update if all segments are complete
1771                 if (session_.all_segments_complete(segment))
1772                         set_current_segment(segment);
1773                 break;
1774
1775         case Trace::ShowAllSegments:
1776         case Trace::ShowAccumulatedIntensity:
1777         default:
1778                 break;
1779         }
1780 }
1781
1782 void View::on_settingViewTriggerIsZeroTime_changed(const QVariant new_value)
1783 {
1784         if (new_value.toBool()) {
1785                 // The first trigger for this segment is used as the zero position
1786                 vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
1787                 if (triggers.size() > 0)
1788                         set_zero_position(triggers.front());
1789         } else
1790                 reset_zero_position();
1791 }
1792
1793 void View::perform_delayed_view_update()
1794 {
1795         if (always_zoom_to_fit_) {
1796                 zoom_fit(true);
1797         } else if (sticky_scrolling_) {
1798                 // Make right side of the view sticky
1799                 double length = 0;
1800                 Timestamp offset;
1801                 get_scroll_layout(length, offset);
1802
1803                 const QSize areaSize = viewport_->size();
1804                 length = max(length - areaSize.width(), 0.0);
1805
1806                 set_offset(scale_ * length);
1807         }
1808
1809         determine_time_unit();
1810         update_scroll();
1811         ruler_->update();
1812         viewport_->update();
1813 }
1814
1815 void View::process_sticky_events()
1816 {
1817         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1818                 update_layout();
1819         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1820                 restack_all_trace_tree_items();
1821                 update_scroll();
1822         }
1823
1824         // Clear the sticky events
1825         sticky_events_ = 0;
1826 }
1827
1828 } // namespace trace
1829 } // namespace views
1830 } // namespace pv