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