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