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 void View::set_current_segment(uint32_t segment_id)
 492 {
 493         current_segment_ = segment_id;
 494
 495         for (shared_ptr<Signal> signal : signals_)
 496                 signal->set_current_segment(current_segment_);
 497         for (shared_ptr<DecodeTrace> dt : decode_traces_)
 498                 dt->set_current_segment(current_segment_);
 499
 500         viewport_->update();
 501 }
 502
 503 bool View::segment_is_selectable() const
 504 {
 505         return segment_selectable_;
 506 }
 507
 508 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 509 {
 510         for (shared_ptr<Signal> signal : signals_)
 511                 signal->set_segment_display_mode(mode);
 512
 513         viewport_->update();
 514
 515         segment_selectable_ = true;
 516
 517         if (mode == Trace::ShowLastSegmentOnly)
 518                 segment_selectable_ = false;
 519
 520         segment_display_mode_changed(segment_selectable_);
 521 }
 522
 523 void View::zoom(double steps)
 524 {
 525         zoom(steps, viewport_->width() / 2);
 526 }
 527
 528 void View::zoom(double steps, int offset)
 529 {
 530         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 531 }
 532
 533 void View::zoom_fit(bool gui_state)
 534 {
 535         // Act as one-shot when stopped, toggle along with the GUI otherwise
 536         if (session_.get_capture_state() == Session::Stopped) {
 537                 always_zoom_to_fit_ = false;
 538                 always_zoom_to_fit_changed(false);
 539         } else {
 540                 always_zoom_to_fit_ = gui_state;
 541                 always_zoom_to_fit_changed(gui_state);
 542         }
 543
 544         const pair<Timestamp, Timestamp> extents = get_time_extents();
 545         const Timestamp delta = extents.second - extents.first;
 546         if (delta < Timestamp("1e-12"))
 547                 return;
 548
 549         assert(viewport_);
 550         const int w = viewport_->width();
 551         if (w <= 0)
 552                 return;
 553
 554         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 555         set_scale_offset(scale.convert_to<double>(), extents.first);
 556 }
 557
 558 void View::zoom_one_to_one()
 559 {
 560         using pv::data::SignalData;
 561
 562         // Make a set of all the visible data objects
 563         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 564         if (visible_data.empty())
 565                 return;
 566
 567         assert(viewport_);
 568         const int w = viewport_->width();
 569         if (w <= 0)
 570                 return;
 571
 572         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 573 }
 574
 575 void View::set_scale_offset(double scale, const Timestamp& offset)
 576 {
 577         // Disable sticky scrolling / always zoom to fit when acquisition runs
 578         // and user drags the viewport
 579         if ((scale_ == scale) && (offset_ != offset) &&
 580                         (session_.get_capture_state() == Session::Running)) {
 581
 582                 if (sticky_scrolling_) {
 583                         sticky_scrolling_ = false;
 584                         sticky_scrolling_changed(false);
 585                 }
 586
 587                 if (always_zoom_to_fit_) {
 588                         always_zoom_to_fit_ = false;
 589                         always_zoom_to_fit_changed(false);
 590                 }
 591         }
 592
 593         set_scale(scale);
 594         set_offset(offset);
 595
 596         calculate_tick_spacing();
 597
 598         update_scroll();
 599         ruler_->update();
 600         viewport_->update();
 601 }
 602
 603 set< shared_ptr<SignalData> > View::get_visible_data() const
 604 {
 605         // Make a set of all the visible data objects
 606         set< shared_ptr<SignalData> > visible_data;
 607         for (const shared_ptr<Signal> sig : signals_)
 608                 if (sig->enabled())
 609                         visible_data.insert(sig->data());
 610
 611         return visible_data;
 612 }
 613
 614 pair<Timestamp, Timestamp> View::get_time_extents() const
 615 {
 616         boost::optional<Timestamp> left_time, right_time;
 617         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 618         for (const shared_ptr<SignalData> d : visible_data) {
 619                 const vector< shared_ptr<Segment> > segments = d->segments();
 620                 for (const shared_ptr<Segment> &s : segments) {
 621                         double samplerate = s->samplerate();
 622                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 623
 624                         const Timestamp start_time = s->start_time();
 625                         left_time = left_time ?
 626                                 min(*left_time, start_time) :
 627                                                 start_time;
 628                         right_time = right_time ?
 629                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 630                                                  start_time + d->max_sample_count() / samplerate;
 631                 }
 632         }
 633
 634         if (!left_time || !right_time)
 635                 return make_pair(0, 0);
 636
 637         assert(*left_time < *right_time);
 638         return make_pair(*left_time, *right_time);
 639 }
 640
 641 void View::enable_show_sampling_points(bool state)
 642 {
 643         (void)state;
 644
 645         viewport_->update();
 646 }
 647
 648 void View::enable_show_analog_minor_grid(bool state)
 649 {
 650         (void)state;
 651
 652         viewport_->update();
 653 }
 654
 655 void View::enable_coloured_bg(bool state)
 656 {
 657         coloured_bg_ = state;
 658         viewport_->update();
 659 }
 660
 661 bool View::coloured_bg() const
 662 {
 663         return coloured_bg_;
 664 }
 665
 666 bool View::cursors_shown() const
 667 {
 668         return show_cursors_;
 669 }
 670
 671 void View::show_cursors(bool show)
 672 {
 673         show_cursors_ = show;
 674         ruler_->update();
 675         viewport_->update();
 676 }
 677
 678 void View::centre_cursors()
 679 {
 680         const double time_width = scale_ * viewport_->width();
 681         cursors_->first()->set_time(offset_ + time_width * 0.4);
 682         cursors_->second()->set_time(offset_ + time_width * 0.6);
 683         ruler_->update();
 684         viewport_->update();
 685 }
 686
 687 shared_ptr<CursorPair> View::cursors() const
 688 {
 689         return cursors_;
 690 }
 691
 692 void View::add_flag(const Timestamp& time)
 693 {
 694         flags_.push_back(make_shared<Flag>(*this, time,
 695                 QString("%1").arg(next_flag_text_)));
 696
 697         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 698                 (next_flag_text_ + 1);
 699
 700         time_item_appearance_changed(true, true);
 701 }
 702
 703 void View::remove_flag(shared_ptr<Flag> flag)
 704 {
 705         flags_.remove(flag);
 706         time_item_appearance_changed(true, true);
 707 }
 708
 709 vector< shared_ptr<Flag> > View::flags() const
 710 {
 711         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 712         stable_sort(flags.begin(), flags.end(),
 713                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 714                         return a->time() < b->time();
 715                 });
 716
 717         return flags;
 718 }
 719
 720 const QPoint& View::hover_point() const
 721 {
 722         return hover_point_;
 723 }
 724
 725 void View::restack_all_trace_tree_items()
 726 {
 727         // Make a list of owners that is sorted from deepest first
 728         const vector<shared_ptr<TraceTreeItem>> items(
 729                 list_by_type<TraceTreeItem>());
 730         set< TraceTreeItemOwner* > owners;
 731         for (const auto &r : items)
 732                 owners.insert(r->owner());
 733         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 734         sort(sorted_owners.begin(), sorted_owners.end(),
 735                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 736                         return a->depth() > b->depth(); });
 737
 738         // Restack the items recursively
 739         for (auto &o : sorted_owners)
 740                 o->restack_items();
 741
 742         // Animate the items to their destination
 743         for (const auto &i : items)
 744                 i->animate_to_layout_v_offset();
 745 }
 746
 747 void View::trigger_event(util::Timestamp location)
 748 {
 749         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 750 }
 751
 752 void View::get_scroll_layout(double &length, Timestamp &offset) const
 753 {
 754         const pair<Timestamp, Timestamp> extents = get_time_extents();
 755         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 756         offset = offset_ / scale_;
 757 }
 758
 759 void View::set_zoom(double scale, int offset)
 760 {
 761         // Reset the "always zoom to fit" feature as the user changed the zoom
 762         always_zoom_to_fit_ = false;
 763         always_zoom_to_fit_changed(false);
 764
 765         const Timestamp cursor_offset = offset_ + scale_ * offset;
 766         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 767         const Timestamp new_offset = cursor_offset - new_scale * offset;
 768         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 769 }
 770
 771 void View::calculate_tick_spacing()
 772 {
 773         const double SpacingIncrement = 10.0f;
 774         const double MinValueSpacing = 40.0f;
 775
 776         // Figure out the highest numeric value visible on a label
 777         const QSize areaSize = viewport_->size();
 778         const Timestamp max_time = max(fabs(offset_),
 779                 fabs(offset_ + scale_ * areaSize.width()));
 780
 781         double min_width = SpacingIncrement;
 782         double label_width, tick_period_width;
 783
 784         QFontMetrics m(QApplication::font());
 785
 786         // Copies of the member variables with the same name, used in the calculation
 787         // and written back afterwards, so that we don't emit signals all the time
 788         // during the calculation.
 789         pv::util::Timestamp tick_period = tick_period_;
 790         pv::util::SIPrefix tick_prefix = tick_prefix_;
 791         unsigned tick_precision = tick_precision_;
 792
 793         do {
 794                 const double min_period = scale_ * min_width;
 795
 796                 const int order = (int)floorf(log10f(min_period));
 797                 const pv::util::Timestamp order_decimal =
 798                         pow(pv::util::Timestamp(10), order);
 799
 800                 // Allow for a margin of error so that a scale unit of 1 can be used.
 801                 // Otherwise, for a SU of 1 the tick period will almost always be below
 802                 // the min_period by a small amount - and thus skipped in favor of 2.
 803                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 804                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 805                 double tp_with_margin;
 806                 unsigned int unit = 0;
 807
 808                 do {
 809                         tp_with_margin = order_decimal.convert_to<double>() *
 810                                 (ScaleUnits[unit++] + tp_margin);
 811                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 812
 813                 tick_period = order_decimal * ScaleUnits[unit - 1];
 814                 tick_prefix = static_cast<pv::util::SIPrefix>(
 815                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 816
 817                 // Precision is the number of fractional digits required, not
 818                 // taking the prefix into account (and it must never be negative)
 819                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 820
 821                 tick_period_width = (tick_period / scale_).convert_to<double>();
 822
 823                 const QString label_text = Ruler::format_time_with_distance(
 824                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 825
 826                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 827                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 828                                 MinValueSpacing;
 829
 830                 min_width += SpacingIncrement;
 831         } while (tick_period_width < label_width);
 832
 833         set_tick_period(tick_period);
 834         set_tick_prefix(tick_prefix);
 835         set_tick_precision(tick_precision);
 836 }
 837
 838 void View::adjust_top_margin()
 839 {
 840         assert(viewport_);
 841
 842         const QSize areaSize = viewport_->size();
 843
 844         const pair<int, int> extents = v_extents();
 845         const int top_margin = owner_visual_v_offset() + extents.first;
 846         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
 847
 848         // Do we have empty space at the top while the last trace goes out of screen?
 849         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
 850                 const int trace_height = extents.second - extents.first;
 851
 852                 // Center everything vertically if there is enough space
 853                 if (areaSize.height() >= trace_height)
 854                         set_v_offset(extents.first -
 855                                 ((areaSize.height() - trace_height) / 2));
 856                 else
 857                         // Remove the top margin to make as many traces fit on screen as possible
 858                         set_v_offset(extents.first);
 859         }
 860 }
 861
 862 void View::update_scroll()
 863 {
 864         assert(viewport_);
 865         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
 866         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
 867
 868         const QSize areaSize = viewport_->size();
 869
 870         // Set the horizontal scroll bar
 871         double length = 0;
 872         Timestamp offset;
 873         get_scroll_layout(length, offset);
 874         length = max(length - areaSize.width(), 0.0);
 875
 876         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
 877
 878         hscrollbar->setPageStep(areaSize.width() / 2);
 879         hscrollbar->setSingleStep(major_tick_distance);
 880
 881         updating_scroll_ = true;
 882
 883         if (length < MaxScrollValue) {
 884                 hscrollbar->setRange(0, length);
 885                 hscrollbar->setSliderPosition(offset.convert_to<double>());
 886         } else {
 887                 hscrollbar->setRange(0, MaxScrollValue);
 888                 hscrollbar->setSliderPosition(
 889                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
 890         }
 891
 892         updating_scroll_ = false;
 893
 894         // Set the vertical scrollbar
 895         vscrollbar->setPageStep(areaSize.height());
 896         vscrollbar->setSingleStep(areaSize.height() / 8);
 897
 898         const pair<int, int> extents = v_extents();
 899
 900         // Don't change the scrollbar range if there are no traces
 901         if (extents.first != extents.second)
 902                 vscrollbar->setRange(extents.first - areaSize.height(),
 903                         extents.second);
 904
 905         if (scroll_needs_defaults_)
 906                 set_scroll_default();
 907 }
 908
 909 void View::reset_scroll()
 910 {
 911         scrollarea_->verticalScrollBar()->setRange(0, 0);
 912 }
 913
 914 void View::set_scroll_default()
 915 {
 916         assert(viewport_);
 917
 918         const QSize areaSize = viewport_->size();
 919
 920         const pair<int, int> extents = v_extents();
 921         const int trace_height = extents.second - extents.first;
 922
 923         // Do all traces fit in the view?
 924         if (areaSize.height() >= trace_height)
 925                 // Center all traces vertically
 926                 set_v_offset(extents.first -
 927                         ((areaSize.height() - trace_height) / 2));
 928         else
 929                 // Put the first trace at the top, letting the bottom ones overflow
 930                 set_v_offset(extents.first);
 931 }
 932
 933 void View::determine_if_header_was_shrunk()
 934 {
 935         const int header_pane_width = splitter_->sizes().front();
 936         const int header_width = header_->extended_size_hint().width();
 937
 938         // Allow for a slight margin of error so that we also accept
 939         // slight differences when e.g. a label name change increased
 940         // the overall width
 941         header_was_shrunk_ = (header_pane_width < (header_width - 10));
 942 }
 943
 944 void View::resize_header_to_fit()
 945 {
 946         // Setting the maximum width of the header widget doesn't work as
 947         // expected because the splitter would allow the user to make the
 948         // pane wider than that, creating empty space as a result.
 949         // To make this work, we stricly enforce the maximum width by
 950         // expanding the header unless the user shrunk it on purpose.
 951         // As we're then setting the width of the header pane, we set the
 952         // splitter to the maximum allowed position.
 953
 954         int splitter_area_width = 0;
 955         for (int w : splitter_->sizes())
 956                 splitter_area_width += w;
 957
 958         // Make sure the header has enough horizontal space to show all labels fully
 959         QList<int> pane_sizes;
 960         pane_sizes.push_back(header_->extended_size_hint().width());
 961         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
 962         splitter_->setSizes(pane_sizes);
 963 }
 964
 965 void View::update_layout()
 966 {
 967         update_scroll();
 968 }
 969
 970 TraceTreeItemOwner* View::find_prevalent_trace_group(
 971         const shared_ptr<sigrok::ChannelGroup> &group,
 972         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
 973                 &signal_map)
 974 {
 975         assert(group);
 976
 977         unordered_set<TraceTreeItemOwner*> owners;
 978         vector<TraceTreeItemOwner*> owner_list;
 979
 980         // Make a set and a list of all the owners
 981         for (const auto &channel : group->channels()) {
 982                 for (auto entry : signal_map) {
 983                         if (entry.first->channel() == channel) {
 984                                 TraceTreeItemOwner *const o = (entry.second)->owner();
 985                                 owner_list.push_back(o);
 986                                 owners.insert(o);
 987                         }
 988                 }
 989         }
 990
 991         // Iterate through the list of owners, and find the most prevalent
 992         size_t max_prevalence = 0;
 993         TraceTreeItemOwner *prevalent_owner = nullptr;
 994         for (TraceTreeItemOwner *owner : owners) {
 995                 const size_t prevalence = count_if(
 996                         owner_list.begin(), owner_list.end(),
 997                         [&](TraceTreeItemOwner *o) { return o == owner; });
 998                 if (prevalence > max_prevalence) {
 999                         max_prevalence = prevalence;
1000                         prevalent_owner = owner;
1001                 }
1002         }
1003
1004         return prevalent_owner;
1005 }
1006
1007 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1008         const vector< shared_ptr<sigrok::Channel> > &channels,
1009         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1010                 &signal_map,
1011         set< shared_ptr<Trace> > &add_list)
1012 {
1013         vector< shared_ptr<Trace> > filtered_traces;
1014
1015         for (const auto &channel : channels) {
1016                 for (auto entry : signal_map) {
1017                         if (entry.first->channel() == channel) {
1018                                 shared_ptr<Trace> trace = entry.second;
1019                                 const auto list_iter = add_list.find(trace);
1020                                 if (list_iter == add_list.end())
1021                                         continue;
1022
1023                                 filtered_traces.push_back(trace);
1024                                 add_list.erase(list_iter);
1025                         }
1026                 }
1027         }
1028
1029         return filtered_traces;
1030 }
1031
1032 void View::determine_time_unit()
1033 {
1034         // Check whether we know the sample rate and hence can use time as the unit
1035         if (time_unit_ == util::TimeUnit::Samples) {
1036                 // Check all signals but...
1037                 for (const shared_ptr<Signal> signal : signals_) {
1038                         const shared_ptr<SignalData> data = signal->data();
1039
1040                         // ...only check first segment of each
1041                         const vector< shared_ptr<Segment> > segments = data->segments();
1042                         if (!segments.empty())
1043                                 if (segments[0]->samplerate()) {
1044                                         set_time_unit(util::TimeUnit::Time);
1045                                         break;
1046                                 }
1047                 }
1048         }
1049 }
1050
1051 bool View::eventFilter(QObject *object, QEvent *event)
1052 {
1053         const QEvent::Type type = event->type();
1054         if (type == QEvent::MouseMove) {
1055
1056                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1057                 if (object == viewport_)
1058                         hover_point_ = mouse_event->pos();
1059                 else if (object == ruler_)
1060                         hover_point_ = QPoint(mouse_event->x(), 0);
1061                 else if (object == header_)
1062                         hover_point_ = QPoint(0, mouse_event->y());
1063                 else
1064                         hover_point_ = QPoint(-1, -1);
1065
1066                 update_hover_point();
1067
1068         } else if (type == QEvent::Leave) {
1069                 hover_point_ = QPoint(-1, -1);
1070                 update_hover_point();
1071         } else if (type == QEvent::Show) {
1072
1073                 // This is somewhat of a hack, unfortunately. We cannot use
1074                 // set_v_offset() from within restore_settings() as the view
1075                 // at that point is neither visible nor properly sized.
1076                 // This is the least intrusive workaround I could come up
1077                 // with: set the vertical offset (or scroll defaults) when
1078                 // the view is shown, which happens after all widgets were
1079                 // resized to their final sizes.
1080                 update_layout();
1081
1082                 if (settings_restored_)
1083                         determine_if_header_was_shrunk();
1084                 else
1085                         resize_header_to_fit();
1086
1087                 if (scroll_needs_defaults_) {
1088                         set_scroll_default();
1089                         scroll_needs_defaults_ = false;
1090                 }
1091
1092                 if (saved_v_offset_) {
1093                         set_v_offset(saved_v_offset_);
1094                         saved_v_offset_ = 0;
1095                 }
1096         }
1097
1098         return QObject::eventFilter(object, event);
1099 }
1100
1101 void View::resizeEvent(QResizeEvent* event)
1102 {
1103         // Only adjust the top margin if we shrunk vertically
1104         if (event->size().height() < event->oldSize().height())
1105                 adjust_top_margin();
1106
1107         update_layout();
1108 }
1109
1110 void View::update_hover_point()
1111 {
1112         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1113                 list_by_type<TraceTreeItem>());
1114         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1115                 r->hover_point_changed(hover_point_);
1116
1117         hover_point_changed(hover_point_);
1118 }
1119
1120 void View::row_item_appearance_changed(bool label, bool content)
1121 {
1122         if (label)
1123                 header_->update();
1124         if (content)
1125                 viewport_->update();
1126 }
1127
1128 void View::time_item_appearance_changed(bool label, bool content)
1129 {
1130         if (label) {
1131                 ruler_->update();
1132
1133                 // Make sure the header pane width is updated, too
1134                 update_layout();
1135         }
1136
1137         if (content)
1138                 viewport_->update();
1139 }
1140
1141 void View::extents_changed(bool horz, bool vert)
1142 {
1143         sticky_events_ |=
1144                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1145                 (vert ? TraceTreeItemVExtentsChanged : 0);
1146
1147         lazy_event_handler_.start();
1148 }
1149
1150 void View::on_signal_name_changed()
1151 {
1152         if (!header_was_shrunk_)
1153                 resize_header_to_fit();
1154 }
1155
1156 void View::on_splitter_moved()
1157 {
1158         // The header can only shrink when the splitter is moved manually
1159         determine_if_header_was_shrunk();
1160
1161         if (!header_was_shrunk_)
1162                 resize_header_to_fit();
1163 }
1164
1165 void View::h_scroll_value_changed(int value)
1166 {
1167         if (updating_scroll_)
1168                 return;
1169
1170         // Disable sticky scrolling when user moves the horizontal scroll bar
1171         // during a running acquisition
1172         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1173                 sticky_scrolling_ = false;
1174                 sticky_scrolling_changed(false);
1175         }
1176
1177         const int range = scrollarea_->horizontalScrollBar()->maximum();
1178         if (range < MaxScrollValue)
1179                 set_offset(scale_ * value);
1180         else {
1181                 double length = 0;
1182                 Timestamp offset;
1183                 get_scroll_layout(length, offset);
1184                 set_offset(scale_ * length * value / MaxScrollValue);
1185         }
1186
1187         ruler_->update();
1188         viewport_->update();
1189 }
1190
1191 void View::v_scroll_value_changed()
1192 {
1193         header_->update();
1194         viewport_->update();
1195 }
1196
1197 void View::signals_changed()
1198 {
1199         using sigrok::Channel;
1200
1201         vector< shared_ptr<Channel> > channels;
1202         shared_ptr<sigrok::Device> sr_dev;
1203         bool signals_added_or_removed = false;
1204
1205         // Do we need to set the vertical scrollbar to its default position later?
1206         // We do if there are no traces, i.e. the scroll bar has no range set
1207         bool reset_scrollbar =
1208                 (scrollarea_->verticalScrollBar()->minimum() ==
1209                         scrollarea_->verticalScrollBar()->maximum());
1210
1211         if (!session_.device()) {
1212                 reset_scroll();
1213                 signals_.clear();
1214         } else {
1215                 sr_dev = session_.device()->device();
1216                 assert(sr_dev);
1217                 channels = sr_dev->channels();
1218         }
1219
1220         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1221
1222         // Make a list of traces that are being added, and a list of traces
1223         // that are being removed
1224         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1225         const set<shared_ptr<Trace>> prev_traces(
1226                 prev_trace_list.begin(), prev_trace_list.end());
1227
1228         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1229
1230 #ifdef ENABLE_DECODE
1231         traces.insert(decode_traces_.begin(), decode_traces_.end());
1232 #endif
1233
1234         set< shared_ptr<Trace> > add_traces;
1235         set_difference(traces.begin(), traces.end(),
1236                 prev_traces.begin(), prev_traces.end(),
1237                 inserter(add_traces, add_traces.begin()));
1238
1239         set< shared_ptr<Trace> > remove_traces;
1240         set_difference(prev_traces.begin(), prev_traces.end(),
1241                 traces.begin(), traces.end(),
1242                 inserter(remove_traces, remove_traces.begin()));
1243
1244         // Make a look-up table of sigrok Channels to pulseview Signals
1245         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1246                 signal_map;
1247         for (const shared_ptr<Signal> &sig : signals_)
1248                 signal_map[sig->base()] = sig;
1249
1250         // Populate channel groups
1251         if (sr_dev)
1252                 for (auto entry : sr_dev->channel_groups()) {
1253                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1254
1255                         if (group->channels().size() <= 1)
1256                                 continue;
1257
1258                         // Find best trace group to add to
1259                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1260                                 group, signal_map);
1261
1262                         // If there is no trace group, create one
1263                         shared_ptr<TraceGroup> new_trace_group;
1264                         if (!owner) {
1265                                 new_trace_group.reset(new TraceGroup());
1266                                 owner = new_trace_group.get();
1267                         }
1268
1269                         // Extract traces for the trace group, removing them from
1270                         // the add list
1271                         const vector< shared_ptr<Trace> > new_traces_in_group =
1272                                 extract_new_traces_for_channels(group->channels(),
1273                                         signal_map, add_traces);
1274
1275                         // Add the traces to the group
1276                         const pair<int, int> prev_v_extents = owner->v_extents();
1277                         int offset = prev_v_extents.second - prev_v_extents.first;
1278                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1279                                 assert(trace);
1280                                 owner->add_child_item(trace);
1281
1282                                 const pair<int, int> extents = trace->v_extents();
1283                                 if (trace->enabled())
1284                                         offset += -extents.first;
1285                                 trace->force_to_v_offset(offset);
1286                                 if (trace->enabled())
1287                                         offset += extents.second;
1288                         }
1289
1290                         if (new_trace_group) {
1291                                 // Assign proper vertical offsets to each channel in the group
1292                                 new_trace_group->restack_items();
1293
1294                                 // If this is a new group, enqueue it in the new top level
1295                                 // items list
1296                                 if (!new_traces_in_group.empty())
1297                                         new_top_level_items.push_back(new_trace_group);
1298                         }
1299                 }
1300
1301         // Enqueue the remaining logic channels in a group
1302         vector< shared_ptr<Channel> > logic_channels;
1303         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1304                 [](const shared_ptr<Channel>& c) {
1305                         return c->type() == sigrok::ChannelType::LOGIC; });
1306
1307         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1308                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1309
1310         if (non_grouped_logic_signals.size() > 0) {
1311                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1312                         make_shared<TraceGroup>());
1313                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1314                         non_grouped_trace_group->add_child_item(trace);
1315
1316                 non_grouped_trace_group->restack_items();
1317                 new_top_level_items.push_back(non_grouped_trace_group);
1318         }
1319
1320         // Enqueue the remaining channels as free ungrouped traces
1321         const vector< shared_ptr<Trace> > new_top_level_signals =
1322                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1323         new_top_level_items.insert(new_top_level_items.end(),
1324                 new_top_level_signals.begin(), new_top_level_signals.end());
1325
1326         // Enqueue any remaining traces i.e. decode traces
1327         new_top_level_items.insert(new_top_level_items.end(),
1328                 add_traces.begin(), add_traces.end());
1329
1330         // Remove any removed traces
1331         for (shared_ptr<Trace> trace : remove_traces) {
1332                 TraceTreeItemOwner *const owner = trace->owner();
1333                 assert(owner);
1334                 owner->remove_child_item(trace);
1335                 signals_added_or_removed = true;
1336         }
1337
1338         // Remove any empty trace groups
1339         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1340                 if (group->child_items().size() == 0) {
1341                         remove_child_item(group);
1342                         group.reset();
1343                 }
1344
1345         // Add and position the pending top levels items
1346         int offset = v_extents().second;
1347         for (auto item : new_top_level_items) {
1348                 add_child_item(item);
1349
1350                 // Position the item after the last item or at the top if there is none
1351                 const pair<int, int> extents = item->v_extents();
1352
1353                 if (item->enabled())
1354                         offset += -extents.first;
1355
1356                 item->force_to_v_offset(offset);
1357
1358                 if (item->enabled())
1359                         offset += extents.second;
1360                 signals_added_or_removed = true;
1361         }
1362
1363
1364         if (signals_added_or_removed && !header_was_shrunk_)
1365                 resize_header_to_fit();
1366
1367         update_layout();
1368
1369         header_->update();
1370         viewport_->update();
1371
1372         if (reset_scrollbar)
1373                 set_scroll_default();
1374 }
1375
1376 void View::capture_state_updated(int state)
1377 {
1378         GlobalSettings settings;
1379
1380         if (state == Session::Running) {
1381                 set_time_unit(util::TimeUnit::Samples);
1382
1383                 trigger_markers_.clear();
1384
1385                 scale_at_acq_start_ = scale_;
1386                 offset_at_acq_start_ = offset_;
1387
1388                 // Activate "always zoom to fit" if the setting is enabled and we're
1389                 // the main view of this session (other trace views may be used for
1390                 // zooming and we don't want to mess them up)
1391                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1392                 if (is_main_view_ && state) {
1393                         always_zoom_to_fit_ = true;
1394                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1395                 }
1396
1397                 // Enable sticky scrolling if the setting is enabled
1398                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1399
1400                 // Reset all traces to segment 0
1401                 current_segment_ = 0;
1402                 set_current_segment(current_segment_);
1403         }
1404
1405         if (state == Session::Stopped) {
1406                 // After acquisition has stopped we need to re-calculate the ticks once
1407                 // as it's otherwise done when the user pans or zooms, which is too late
1408                 calculate_tick_spacing();
1409
1410                 // Reset "always zoom to fit", the acquisition has stopped
1411                 if (always_zoom_to_fit_) {
1412                         // Perform a final zoom-to-fit before disabling
1413                         zoom_fit(always_zoom_to_fit_);
1414                         always_zoom_to_fit_ = false;
1415                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1416                 }
1417
1418                 bool zoom_to_fit_after_acq =
1419                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1420
1421                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1422                 // we didn't restore settings in the meanwhile
1423                 if (zoom_to_fit_after_acq &&
1424                         !suppress_zoom_to_fit_after_acq_ &&
1425                         (scale_ == scale_at_acq_start_) &&
1426                         (offset_ == offset_at_acq_start_))
1427                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1428
1429                 suppress_zoom_to_fit_after_acq_ = false;
1430         }
1431 }
1432
1433 void View::on_new_segment(int new_segment_id)
1434 {
1435         on_segment_changed(new_segment_id);
1436         segment_changed(new_segment_id);
1437 }
1438
1439 void View::on_segment_completed(int segment_id)
1440 {
1441         on_segment_changed(segment_id);
1442         segment_changed(segment_id);
1443 }
1444
1445 void View::on_segment_changed(int segment)
1446 {
1447         switch (segment_display_mode_) {
1448         case Trace::ShowLastSegmentOnly:
1449         case Trace::ShowSingleSegmentOnly:
1450                 set_current_segment(segment);
1451                 break;
1452
1453         case Trace::ShowLastCompleteSegmentOnly:
1454                 {
1455                         // Only update if all segments are complete
1456                         bool all_complete = true;
1457
1458                         for (shared_ptr<Signal> signal : signals_)
1459                                 if (!signal->base()->segment_is_complete(segment))
1460                                         all_complete = false;
1461
1462                         if (all_complete)
1463                                 set_current_segment(segment);
1464                 }
1465                 break;
1466
1467         case Trace::ShowAllSegments:
1468         case Trace::ShowAccumulatedIntensity:
1469         default:
1470                 break;
1471         }
1472 }
1473
1474 void View::perform_delayed_view_update()
1475 {
1476         if (always_zoom_to_fit_) {
1477                 zoom_fit(true);
1478         } else if (sticky_scrolling_) {
1479                 // Make right side of the view sticky
1480                 double length = 0;
1481                 Timestamp offset;
1482                 get_scroll_layout(length, offset);
1483
1484                 const QSize areaSize = viewport_->size();
1485                 length = max(length - areaSize.width(), 0.0);
1486
1487                 set_offset(scale_ * length);
1488         }
1489
1490         determine_time_unit();
1491         update_scroll();
1492         ruler_->update();
1493         viewport_->update();
1494 }
1495
1496 void View::process_sticky_events()
1497 {
1498         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1499                 update_layout();
1500         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1501                 restack_all_trace_tree_items();
1502                 update_scroll();
1503         }
1504
1505         // Clear the sticky events
1506         sticky_events_ = 0;
1507 }
1508
1509 } // namespace trace
1510 } // namespace views
1511 } // namespace pv