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