pv/views/trace/view.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifdef ENABLE_DECODE
  21 #include <libsigrokdecode/libsigrokdecode.h>
  22 #endif
  23
  24 #include <extdef.h>
  25
  26 #include <algorithm>
  27 #include <cassert>
  28 #include <climits>
  29 #include <cmath>
  30 #include <iostream>
  31 #include <iterator>
  32 #include <unordered_set>
  33
  34 #include <boost/archive/text_iarchive.hpp>
  35 #include <boost/archive/text_oarchive.hpp>
  36 #include <boost/serialization/serialization.hpp>
  37
  38 #include <QApplication>
  39 #include <QEvent>
  40 #include <QFontMetrics>
  41 #include <QMenu>
  42 #include <QMouseEvent>
  43 #include <QScrollBar>
  44 #include <QVBoxLayout>
  45
  46 #include <libsigrokcxx/libsigrokcxx.hpp>
  47
  48 #include "analogsignal.hpp"
  49 #include "header.hpp"
  50 #include "logicsignal.hpp"
  51 #include "ruler.hpp"
  52 #include "signal.hpp"
  53 #include "tracegroup.hpp"
  54 #include "triggermarker.hpp"
  55 #include "view.hpp"
  56 #include "viewport.hpp"
  57
  58 #include "pv/data/logic.hpp"
  59 #include "pv/data/logicsegment.hpp"
  60 #include "pv/devices/device.hpp"
  61 #include "pv/globalsettings.hpp"
  62 #include "pv/session.hpp"
  63 #include "pv/util.hpp"
  64
  65 #ifdef ENABLE_DECODE
  66 #include "decodetrace.hpp"
  67 #endif
  68
  69 using pv::data::SignalData;
  70 using pv::data::Segment;
  71 using pv::util::TimeUnit;
  72 using pv::util::Timestamp;
  73
  74 using std::back_inserter;
  75 using std::copy_if;
  76 using std::count_if;
  77 using std::inserter;
  78 using std::max;
  79 using std::make_pair;
  80 using std::make_shared;
  81 using std::min;
  82 using std::pair;
  83 using std::set;
  84 using std::set_difference;
  85 using std::shared_ptr;
  86 using std::stringstream;
  87 using std::unordered_map;
  88 using std::unordered_set;
  89 using std::vector;
  90
  91 namespace pv {
  92 namespace views {
  93 namespace trace {
  94
  95 const Timestamp View::MaxScale("1e9");
  96 const Timestamp View::MinScale("1e-12");
  97
  98 const int View::MaxScrollValue = INT_MAX / 2;
  99
 100 const int View::ScaleUnits[3] = {1, 2, 5};
 101
 102
 103 CustomScrollArea::CustomScrollArea(QWidget *parent) :
 104         QAbstractScrollArea(parent)
 105 {
 106 }
 107
 108 bool CustomScrollArea::viewportEvent(QEvent *event)
 109 {
 110         switch (event->type()) {
 111         case QEvent::Paint:
 112         case QEvent::MouseButtonPress:
 113         case QEvent::MouseButtonRelease:
 114         case QEvent::MouseButtonDblClick:
 115         case QEvent::MouseMove:
 116         case QEvent::Wheel:
 117         case QEvent::TouchBegin:
 118         case QEvent::TouchUpdate:
 119         case QEvent::TouchEnd:
 120                 return false;
 121         default:
 122                 return QAbstractScrollArea::viewportEvent(event);
 123         }
 124 }
 125
 126 View::View(Session &session, bool is_main_view, QWidget *parent) :
 127         ViewBase(session, is_main_view, parent),
 128
 129         // Note: Place defaults in View::reset_view_state(), not here
 130         splitter_(new QSplitter()),
 131         header_was_shrunk_(false),  // The splitter remains unchanged after a reset, so this goes here
 132         sticky_scrolling_(false)  // Default setting is set in MainWindow::setup_ui()
 133 {
 134         QVBoxLayout *root_layout = new QVBoxLayout(this);
 135         root_layout->setContentsMargins(0, 0, 0, 0);
 136         root_layout->addWidget(splitter_);
 137
 138         viewport_ = new Viewport(*this);
 139         scrollarea_ = new CustomScrollArea(splitter_);
 140         scrollarea_->setViewport(viewport_);
 141         scrollarea_->setFrameShape(QFrame::NoFrame);
 142
 143         ruler_ = new Ruler(*this);
 144
 145         header_ = new Header(*this);
 146         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 147
 148         // We put the header into a simple layout so that we can add the top margin,
 149         // allowing us to make it line up with the bottom of the ruler
 150         QWidget *header_container = new QWidget();
 151         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 152         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 153         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 154         header_layout->addWidget(header_);
 155
 156         // To let the ruler and scrollarea be on the same split pane, we need a layout
 157         QWidget *trace_container = new QWidget();
 158         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 159         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 160         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 161         trace_layout->setContentsMargins(0, 0, 0, 0);
 162         trace_layout->addWidget(ruler_);
 163         trace_layout->addWidget(scrollarea_);
 164
 165         splitter_->addWidget(header_container);
 166         splitter_->addWidget(trace_container);
 167         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 168         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 169         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 170         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 171         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 172         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 173
 174         viewport_->installEventFilter(this);
 175         ruler_->installEventFilter(this);
 176         header_->installEventFilter(this);
 177
 178         // Set up settings and event handlers
 179         GlobalSettings settings;
 180         colored_bg_ = settings.value(GlobalSettings::Key_View_ColoredBG).toBool();
 181
 182         GlobalSettings::add_change_handler(this);
 183
 184         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 185                 this, SLOT(h_scroll_value_changed(int)));
 186         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 187                 this, SLOT(v_scroll_value_changed()));
 188
 189         connect(header_, SIGNAL(selection_changed()),
 190                 ruler_, SLOT(clear_selection()));
 191         connect(ruler_, SIGNAL(selection_changed()),
 192                 header_, SLOT(clear_selection()));
 193
 194         connect(header_, SIGNAL(selection_changed()),
 195                 this, SIGNAL(selection_changed()));
 196         connect(ruler_, SIGNAL(selection_changed()),
 197                 this, SIGNAL(selection_changed()));
 198
 199         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 200                 this, SLOT(on_splitter_moved()));
 201
 202         connect(&lazy_event_handler_, SIGNAL(timeout()),
 203                 this, SLOT(process_sticky_events()));
 204         lazy_event_handler_.setSingleShot(true);
 205
 206         // Trigger the initial event manually. The default device has signals
 207         // which were created before this object came into being
 208         signals_changed();
 209
 210         // make sure the transparent widgets are on the top
 211         ruler_->raise();
 212         header_->raise();
 213
 214         reset_view_state();
 215 }
 216
 217 View::~View()
 218 {
 219         GlobalSettings::remove_change_handler(this);
 220 }
 221
 222 void View::reset_view_state()
 223 {
 224         ViewBase::reset_view_state();
 225
 226         segment_display_mode_ = Trace::ShowLastSegmentOnly;
 227         segment_selectable_ = false;
 228         scale_ = 1e-3;
 229         offset_ = 0;
 230         ruler_offset_ = 0;
 231         updating_scroll_ = false;
 232         settings_restored_ = false;
 233         always_zoom_to_fit_ = false;
 234         tick_period_ = 0;
 235         tick_prefix_ = pv::util::SIPrefix::yocto;
 236         tick_precision_ = 0;
 237         time_unit_ = util::TimeUnit::Time;
 238         show_cursors_ = false;
 239         cursors_ = make_shared<CursorPair>(*this);
 240         next_flag_text_ = 'A';
 241         trigger_markers_.clear();
 242         hover_point_ = QPoint(-1, -1);
 243         scroll_needs_defaults_ = true;
 244         saved_v_offset_ = 0;
 245         scale_at_acq_start_ = 0;
 246         offset_at_acq_start_ = 0;
 247         suppress_zoom_to_fit_after_acq_ = false;
 248
 249         show_cursors_ = false;
 250         cursor_state_changed(show_cursors_);
 251         flags_.clear();
 252
 253         // Update the zoom state
 254         calculate_tick_spacing();
 255
 256         // Make sure the standard bar's segment selector is in sync
 257         set_segment_display_mode(segment_display_mode_);
 258 }
 259
 260 Session& View::session()
 261 {
 262         return session_;
 263 }
 264
 265 const Session& View::session() const
 266 {
 267         return session_;
 268 }
 269
 270 unordered_set< shared_ptr<Signal> > View::signals() const
 271 {
 272         return signals_;
 273 }
 274
 275 void View::clear_signals()
 276 {
 277         ViewBase::clear_signalbases();
 278         signals_.clear();
 279 }
 280
 281 void View::add_signal(const shared_ptr<Signal> signal)
 282 {
 283         ViewBase::add_signalbase(signal->base());
 284         signals_.insert(signal);
 285
 286         signal->set_segment_display_mode(segment_display_mode_);
 287         signal->set_current_segment(current_segment_);
 288
 289         connect(signal->base().get(), SIGNAL(name_changed(const QString&)),
 290                 this, SLOT(on_signal_name_changed()));
 291 }
 292
 293 #ifdef ENABLE_DECODE
 294 void View::clear_decode_signals()
 295 {
 296         decode_traces_.clear();
 297 }
 298
 299 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 300 {
 301         shared_ptr<DecodeTrace> d(
 302                 new DecodeTrace(session_, signal, decode_traces_.size()));
 303         decode_traces_.push_back(d);
 304
 305         d->set_segment_display_mode(segment_display_mode_);
 306         d->set_current_segment(current_segment_);
 307
 308         connect(signal.get(), SIGNAL(name_changed(const QString&)),
 309                 this, SLOT(on_signal_name_changed()));
 310 }
 311
 312 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 313 {
 314         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 315                 if ((*i)->base() == signal) {
 316                         decode_traces_.erase(i);
 317                         signals_changed();
 318                         return;
 319                 }
 320 }
 321 #endif
 322
 323 View* View::view()
 324 {
 325         return this;
 326 }
 327
 328 const View* View::view() const
 329 {
 330         return this;
 331 }
 332
 333 Viewport* View::viewport()
 334 {
 335         return viewport_;
 336 }
 337
 338 const Viewport* View::viewport() const
 339 {
 340         return viewport_;
 341 }
 342
 343 void View::save_settings(QSettings &settings) const
 344 {
 345         settings.setValue("scale", scale_);
 346         settings.setValue("v_offset",
 347                 scrollarea_->verticalScrollBar()->sliderPosition());
 348
 349         settings.setValue("splitter_state", splitter_->saveState());
 350         settings.setValue("segment_display_mode", segment_display_mode_);
 351
 352         {
 353                 stringstream ss;
 354                 boost::archive::text_oarchive oa(ss);
 355                 oa << boost::serialization::make_nvp("ruler_shift", ruler_shift_);
 356                 settings.setValue("ruler_shift", QString::fromStdString(ss.str()));
 357         }
 358         {
 359                 stringstream ss;
 360                 boost::archive::text_oarchive oa(ss);
 361                 oa << boost::serialization::make_nvp("offset", offset_);
 362                 settings.setValue("offset", QString::fromStdString(ss.str()));
 363         }
 364
 365         for (shared_ptr<Signal> signal : signals_) {
 366                 settings.beginGroup(signal->base()->internal_name());
 367                 signal->save_settings(settings);
 368                 settings.endGroup();
 369         }
 370 }
 371
 372 void View::restore_settings(QSettings &settings)
 373 {
 374         // Note: It is assumed that this function is only called once,
 375         // immediately after restoring a previous session.
 376
 377         if (settings.contains("scale"))
 378                 set_scale(settings.value("scale").toDouble());
 379
 380         if (settings.contains("ruler_shift")) {
 381                 util::Timestamp shift;
 382                 stringstream ss;
 383                 ss << settings.value("ruler_shift").toString().toStdString();
 384
 385                 try {
 386                         boost::archive::text_iarchive ia(ss);
 387                         ia >> boost::serialization::make_nvp("ruler_shift", shift);
 388                         ruler_shift_ = shift;
 389                 } catch (boost::archive::archive_exception&) {
 390                         qDebug() << "Could not restore the view ruler shift";
 391                 }
 392         }
 393
 394         if (settings.contains("offset")) {
 395                 util::Timestamp offset;
 396                 stringstream ss;
 397                 ss << settings.value("offset").toString().toStdString();
 398
 399                 try {
 400                         boost::archive::text_iarchive ia(ss);
 401                         ia >> boost::serialization::make_nvp("offset", offset);
 402                         // This also updates ruler_offset_
 403                         set_offset(offset);
 404                 } catch (boost::archive::archive_exception&) {
 405                         qDebug() << "Could not restore the view offset";
 406                 }
 407         }
 408
 409         if (settings.contains("splitter_state"))
 410                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 411
 412         if (settings.contains("segment_display_mode"))
 413                 set_segment_display_mode(
 414                         (Trace::SegmentDisplayMode)(settings.value("segment_display_mode").toInt()));
 415
 416         for (shared_ptr<Signal> signal : signals_) {
 417                 settings.beginGroup(signal->base()->internal_name());
 418                 signal->restore_settings(settings);
 419                 settings.endGroup();
 420         }
 421
 422         if (settings.contains("v_offset")) {
 423                 saved_v_offset_ = settings.value("v_offset").toInt();
 424                 set_v_offset(saved_v_offset_);
 425                 scroll_needs_defaults_ = false;
 426                 // Note: see eventFilter() for additional information
 427         }
 428
 429         settings_restored_ = true;
 430         suppress_zoom_to_fit_after_acq_ = true;
 431
 432         // Update the ruler so that it uses the new scale
 433         calculate_tick_spacing();
 434 }
 435
 436 vector< shared_ptr<TimeItem> > View::time_items() const
 437 {
 438         const vector<shared_ptr<Flag>> f(flags());
 439         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 440
 441         if (cursors_) {
 442                 items.push_back(cursors_);
 443                 items.push_back(cursors_->first());
 444                 items.push_back(cursors_->second());
 445         }
 446
 447         for (auto trigger_marker : trigger_markers_)
 448                 items.push_back(trigger_marker);
 449
 450         return items;
 451 }
 452
 453 double View::scale() const
 454 {
 455         return scale_;
 456 }
 457
 458 void View::set_scale(double scale)
 459 {
 460         if (scale_ != scale) {
 461                 scale_ = scale;
 462                 scale_changed();
 463         }
 464 }
 465
 466 void View::set_offset(const pv::util::Timestamp& offset, bool force_update)
 467 {
 468         if ((offset_ != offset) || force_update) {
 469                 offset_ = offset;
 470                 ruler_offset_ = offset_ + ruler_shift_;
 471                 offset_changed();
 472         }
 473 }
 474
 475 const Timestamp& View::offset() const
 476 {
 477         return offset_;
 478 }
 479
 480 const Timestamp& View::ruler_offset() const
 481 {
 482         return ruler_offset_;
 483 }
 484
 485 void View::set_zero_position(pv::util::Timestamp& position)
 486 {
 487         ruler_shift_ = -position;
 488
 489         // Force an immediate update of the offsets
 490         set_offset(offset_, true);
 491         ruler_->update();
 492 }
 493
 494 void View::reset_zero_position()
 495 {
 496         ruler_shift_ = 0;
 497
 498         // Force an immediate update of the offsets
 499         set_offset(offset_, true);
 500         ruler_->update();
 501 }
 502
 503 int View::owner_visual_v_offset() const
 504 {
 505         return -scrollarea_->verticalScrollBar()->sliderPosition();
 506 }
 507
 508 void View::set_v_offset(int offset)
 509 {
 510         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 511         header_->update();
 512         viewport_->update();
 513 }
 514
 515 unsigned int View::depth() const
 516 {
 517         return 0;
 518 }
 519
 520 uint32_t View::current_segment() const
 521 {
 522         return current_segment_;
 523 }
 524
 525 pv::util::SIPrefix View::tick_prefix() const
 526 {
 527         return tick_prefix_;
 528 }
 529
 530 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 531 {
 532         if (tick_prefix_ != tick_prefix) {
 533                 tick_prefix_ = tick_prefix;
 534                 tick_prefix_changed();
 535         }
 536 }
 537
 538 unsigned int View::tick_precision() const
 539 {
 540         return tick_precision_;
 541 }
 542
 543 void View::set_tick_precision(unsigned tick_precision)
 544 {
 545         if (tick_precision_ != tick_precision) {
 546                 tick_precision_ = tick_precision;
 547                 tick_precision_changed();
 548         }
 549 }
 550
 551 const pv::util::Timestamp& View::tick_period() const
 552 {
 553         return tick_period_;
 554 }
 555
 556 unsigned int View::minor_tick_count() const
 557 {
 558         return minor_tick_count_;
 559 }
 560
 561 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 562 {
 563         if (tick_period_ != tick_period) {
 564                 tick_period_ = tick_period;
 565                 tick_period_changed();
 566         }
 567 }
 568
 569 TimeUnit View::time_unit() const
 570 {
 571         return time_unit_;
 572 }
 573
 574 void View::set_time_unit(pv::util::TimeUnit time_unit)
 575 {
 576         if (time_unit_ != time_unit) {
 577                 time_unit_ = time_unit;
 578                 time_unit_changed();
 579         }
 580 }
 581
 582 void View::set_current_segment(uint32_t segment_id)
 583 {
 584         current_segment_ = segment_id;
 585
 586         for (shared_ptr<Signal> signal : signals_)
 587                 signal->set_current_segment(current_segment_);
 588 #ifdef ENABLE_DECODE
 589         for (shared_ptr<DecodeTrace> dt : decode_traces_)
 590                 dt->set_current_segment(current_segment_);
 591 #endif
 592
 593         vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
 594
 595         trigger_markers_.clear();
 596         for (util::Timestamp timestamp : triggers)
 597                 trigger_markers_.push_back(make_shared<TriggerMarker>(*this, timestamp));
 598
 599         // When enabled, the first trigger for this segment is used as the zero position
 600         GlobalSettings settings;
 601         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 602
 603         if (trigger_is_zero_time && (triggers.size() > 0))
 604                 set_zero_position(triggers.front());
 605
 606         viewport_->update();
 607
 608         segment_changed(segment_id);
 609 }
 610
 611 bool View::segment_is_selectable() const
 612 {
 613         return segment_selectable_;
 614 }
 615
 616 Trace::SegmentDisplayMode View::segment_display_mode() const
 617 {
 618         return segment_display_mode_;
 619 }
 620
 621 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 622 {
 623         segment_display_mode_ = mode;
 624
 625         for (shared_ptr<Signal> signal : signals_)
 626                 signal->set_segment_display_mode(mode);
 627
 628         uint32_t last_segment = session_.get_segment_count() - 1;
 629
 630         switch (mode) {
 631         case Trace::ShowLastSegmentOnly:
 632                 if (current_segment_ != last_segment)
 633                         set_current_segment(last_segment);
 634                 break;
 635
 636         case Trace::ShowLastCompleteSegmentOnly:
 637                 // Do nothing if we only have one segment so far
 638                 if (last_segment > 0) {
 639                         // If the last segment isn't complete, the previous one must be
 640                         uint32_t segment_id =
 641                                 (session_.all_segments_complete(last_segment)) ?
 642                                 last_segment : last_segment - 1;
 643
 644                         if (current_segment_ != segment_id)
 645                                 set_current_segment(segment_id);
 646                 }
 647                 break;
 648
 649         case Trace::ShowSingleSegmentOnly:
 650         case Trace::ShowAllSegments:
 651         case Trace::ShowAccumulatedIntensity:
 652         default:
 653                 // Current segment remains as-is
 654                 break;
 655         }
 656
 657         segment_selectable_ = true;
 658
 659         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 660                 segment_selectable_ = false;
 661
 662         viewport_->update();
 663
 664         segment_display_mode_changed((int)mode, segment_selectable_);
 665 }
 666
 667 void View::zoom(double steps)
 668 {
 669         zoom(steps, viewport_->width() / 2);
 670 }
 671
 672 void View::zoom(double steps, int offset)
 673 {
 674         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 675 }
 676
 677 void View::zoom_fit(bool gui_state)
 678 {
 679         // Act as one-shot when stopped, toggle along with the GUI otherwise
 680         if (session_.get_capture_state() == Session::Stopped) {
 681                 always_zoom_to_fit_ = false;
 682                 always_zoom_to_fit_changed(false);
 683         } else {
 684                 always_zoom_to_fit_ = gui_state;
 685                 always_zoom_to_fit_changed(gui_state);
 686         }
 687
 688         const pair<Timestamp, Timestamp> extents = get_time_extents();
 689         const Timestamp delta = extents.second - extents.first;
 690         if (delta < Timestamp("1e-12"))
 691                 return;
 692
 693         assert(viewport_);
 694         const int w = viewport_->width();
 695         if (w <= 0)
 696                 return;
 697
 698         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 699         set_scale_offset(scale.convert_to<double>(), extents.first);
 700 }
 701
 702 void View::set_scale_offset(double scale, const Timestamp& offset)
 703 {
 704         // Disable sticky scrolling / always zoom to fit when acquisition runs
 705         // and user drags the viewport
 706         if ((scale_ == scale) && (offset_ != offset) &&
 707                         (session_.get_capture_state() == Session::Running)) {
 708
 709                 if (sticky_scrolling_) {
 710                         sticky_scrolling_ = false;
 711                         sticky_scrolling_changed(false);
 712                 }
 713
 714                 if (always_zoom_to_fit_) {
 715                         always_zoom_to_fit_ = false;
 716                         always_zoom_to_fit_changed(false);
 717                 }
 718         }
 719
 720         set_scale(scale);
 721         set_offset(offset);
 722
 723         calculate_tick_spacing();
 724
 725         update_scroll();
 726         ruler_->update();
 727         viewport_->update();
 728 }
 729
 730 set< shared_ptr<SignalData> > View::get_visible_data() const
 731 {
 732         // Make a set of all the visible data objects
 733         set< shared_ptr<SignalData> > visible_data;
 734         for (const shared_ptr<Signal> sig : signals_)
 735                 if (sig->enabled())
 736                         visible_data.insert(sig->data());
 737
 738         return visible_data;
 739 }
 740
 741 pair<Timestamp, Timestamp> View::get_time_extents() const
 742 {
 743         boost::optional<Timestamp> left_time, right_time;
 744         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 745         for (const shared_ptr<SignalData> d : visible_data) {
 746                 const vector< shared_ptr<Segment> > segments = d->segments();
 747                 for (const shared_ptr<Segment> &s : segments) {
 748                         double samplerate = s->samplerate();
 749                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 750
 751                         const Timestamp start_time = s->start_time();
 752                         left_time = left_time ?
 753                                 min(*left_time, start_time) :
 754                                                 start_time;
 755                         right_time = right_time ?
 756                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 757                                                  start_time + d->max_sample_count() / samplerate;
 758                 }
 759         }
 760
 761         if (!left_time || !right_time)
 762                 return make_pair(0, 0);
 763
 764         assert(*left_time < *right_time);
 765         return make_pair(*left_time, *right_time);
 766 }
 767
 768 void View::enable_show_sampling_points(bool state)
 769 {
 770         (void)state;
 771
 772         viewport_->update();
 773 }
 774
 775 void View::enable_show_analog_minor_grid(bool state)
 776 {
 777         (void)state;
 778
 779         viewport_->update();
 780 }
 781
 782 void View::enable_colored_bg(bool state)
 783 {
 784         colored_bg_ = state;
 785         viewport_->update();
 786 }
 787
 788 bool View::colored_bg() const
 789 {
 790         return colored_bg_;
 791 }
 792
 793 bool View::cursors_shown() const
 794 {
 795         return show_cursors_;
 796 }
 797
 798 void View::show_cursors(bool show)
 799 {
 800         show_cursors_ = show;
 801         cursor_state_changed(show);
 802         ruler_->update();
 803         viewport_->update();
 804 }
 805
 806 void View::centre_cursors()
 807 {
 808         if (cursors_) {
 809                 const double time_width = scale_ * viewport_->width();
 810                 cursors_->first()->set_time(offset_ + time_width * 0.4);
 811                 cursors_->second()->set_time(offset_ + time_width * 0.6);
 812
 813                 ruler_->update();
 814                 viewport_->update();
 815         }
 816 }
 817
 818 shared_ptr<CursorPair> View::cursors() const
 819 {
 820         return cursors_;
 821 }
 822
 823 void View::add_flag(const Timestamp& time)
 824 {
 825         flags_.push_back(make_shared<Flag>(*this, time,
 826                 QString("%1").arg(next_flag_text_)));
 827
 828         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 829                 (next_flag_text_ + 1);
 830
 831         time_item_appearance_changed(true, true);
 832 }
 833
 834 void View::remove_flag(shared_ptr<Flag> flag)
 835 {
 836         flags_.remove(flag);
 837         time_item_appearance_changed(true, true);
 838 }
 839
 840 vector< shared_ptr<Flag> > View::flags() const
 841 {
 842         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 843         stable_sort(flags.begin(), flags.end(),
 844                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 845                         return a->time() < b->time();
 846                 });
 847
 848         return flags;
 849 }
 850
 851 const QPoint& View::hover_point() const
 852 {
 853         return hover_point_;
 854 }
 855
 856 void View::restack_all_trace_tree_items()
 857 {
 858         // Make a list of owners that is sorted from deepest first
 859         const vector<shared_ptr<TraceTreeItem>> items(
 860                 list_by_type<TraceTreeItem>());
 861         set< TraceTreeItemOwner* > owners;
 862         for (const auto &r : items)
 863                 owners.insert(r->owner());
 864         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 865         sort(sorted_owners.begin(), sorted_owners.end(),
 866                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 867                         return a->depth() > b->depth(); });
 868
 869         // Restack the items recursively
 870         for (auto &o : sorted_owners)
 871                 o->restack_items();
 872
 873         // Animate the items to their destination
 874         for (const auto &i : items)
 875                 i->animate_to_layout_v_offset();
 876 }
 877
 878 void View::on_setting_changed(const QString &key, const QVariant &value)
 879 {
 880         if (key == GlobalSettings::Key_View_TriggerIsZeroTime)
 881                 on_settingViewTriggerIsZeroTime_changed(value);
 882 }
 883
 884 void View::trigger_event(int segment_id, util::Timestamp location)
 885 {
 886         // TODO This doesn't work if we're showing multiple segments at once
 887         if ((uint32_t)segment_id != current_segment_)
 888                 return;
 889
 890         // Set zero location if the Key_View_TriggerIsZeroTime setting is set and
 891         // if this is the first trigger for this segment.
 892         GlobalSettings settings;
 893         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 894
 895         size_t trigger_count = session_.get_triggers(current_segment_).size();
 896
 897         if (trigger_is_zero_time && trigger_count == 1)
 898                 set_zero_position(location);
 899
 900         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 901 }
 902
 903 void View::get_scroll_layout(double &length, Timestamp &offset) const
 904 {
 905         const pair<Timestamp, Timestamp> extents = get_time_extents();
 906         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 907         offset = offset_ / scale_;
 908 }
 909
 910 void View::set_zoom(double scale, int offset)
 911 {
 912         // Reset the "always zoom to fit" feature as the user changed the zoom
 913         always_zoom_to_fit_ = false;
 914         always_zoom_to_fit_changed(false);
 915
 916         const Timestamp cursor_offset = offset_ + scale_ * offset;
 917         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 918         const Timestamp new_offset = cursor_offset - new_scale * offset;
 919         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 920 }
 921
 922 void View::calculate_tick_spacing()
 923 {
 924         const double SpacingIncrement = 10.0f;
 925         const double MinValueSpacing = 40.0f;
 926
 927         // Figure out the highest numeric value visible on a label
 928         const QSize areaSize = viewport_->size();
 929         const Timestamp max_time = max(fabs(offset_),
 930                 fabs(offset_ + scale_ * areaSize.width()));
 931
 932         double min_width = SpacingIncrement;
 933         double label_width, tick_period_width;
 934
 935         QFontMetrics m(QApplication::font());
 936
 937         // Copies of the member variables with the same name, used in the calculation
 938         // and written back afterwards, so that we don't emit signals all the time
 939         // during the calculation.
 940         pv::util::Timestamp tick_period = tick_period_;
 941         pv::util::SIPrefix tick_prefix = tick_prefix_;
 942         unsigned tick_precision = tick_precision_;
 943
 944         do {
 945                 const double min_period = scale_ * min_width;
 946
 947                 const int order = (int)floorf(log10f(min_period));
 948                 const pv::util::Timestamp order_decimal =
 949                         pow(pv::util::Timestamp(10), order);
 950
 951                 // Allow for a margin of error so that a scale unit of 1 can be used.
 952                 // Otherwise, for a SU of 1 the tick period will almost always be below
 953                 // the min_period by a small amount - and thus skipped in favor of 2.
 954                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 955                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 956                 double tp_with_margin;
 957                 unsigned int unit = 0;
 958
 959                 do {
 960                         tp_with_margin = order_decimal.convert_to<double>() *
 961                                 (ScaleUnits[unit++] + tp_margin);
 962                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 963
 964                 minor_tick_count_ = (unit == 2) ? 4 : 5;
 965                 tick_period = order_decimal * ScaleUnits[unit - 1];
 966                 tick_prefix = static_cast<pv::util::SIPrefix>(
 967                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 968
 969                 // Precision is the number of fractional digits required, not
 970                 // taking the prefix into account (and it must never be negative)
 971                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 972
 973                 tick_period_width = (tick_period / scale_).convert_to<double>();
 974
 975                 const QString label_text = Ruler::format_time_with_distance(
 976                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 977
 978                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 979                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 980                                 MinValueSpacing;
 981
 982                 min_width += SpacingIncrement;
 983         } while (tick_period_width < label_width);
 984
 985         set_tick_period(tick_period);
 986         set_tick_prefix(tick_prefix);
 987         set_tick_precision(tick_precision);
 988 }
 989
 990 void View::adjust_top_margin()
 991 {
 992         assert(viewport_);
 993
 994         const QSize areaSize = viewport_->size();
 995
 996         const pair<int, int> extents = v_extents();
 997         const int top_margin = owner_visual_v_offset() + extents.first;
 998         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
 999
1000         // Do we have empty space at the top while the last trace goes out of screen?
1001         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
1002                 const int trace_height = extents.second - extents.first;
1003
1004                 // Center everything vertically if there is enough space
1005                 if (areaSize.height() >= trace_height)
1006                         set_v_offset(extents.first -
1007                                 ((areaSize.height() - trace_height) / 2));
1008                 else
1009                         // Remove the top margin to make as many traces fit on screen as possible
1010                         set_v_offset(extents.first);
1011         }
1012 }
1013
1014 void View::update_scroll()
1015 {
1016         assert(viewport_);
1017         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
1018         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
1019
1020         const QSize areaSize = viewport_->size();
1021
1022         // Set the horizontal scroll bar
1023         double length = 0;
1024         Timestamp offset;
1025         get_scroll_layout(length, offset);
1026         length = max(length - areaSize.width(), 0.0);
1027
1028         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
1029
1030         hscrollbar->setPageStep(areaSize.width() / 2);
1031         hscrollbar->setSingleStep(major_tick_distance);
1032
1033         updating_scroll_ = true;
1034
1035         if (length < MaxScrollValue) {
1036                 hscrollbar->setRange(0, length);
1037                 hscrollbar->setSliderPosition(offset.convert_to<double>());
1038         } else {
1039                 hscrollbar->setRange(0, MaxScrollValue);
1040                 hscrollbar->setSliderPosition(
1041                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
1042         }
1043
1044         updating_scroll_ = false;
1045
1046         // Set the vertical scrollbar
1047         vscrollbar->setPageStep(areaSize.height());
1048         vscrollbar->setSingleStep(areaSize.height() / 8);
1049
1050         const pair<int, int> extents = v_extents();
1051
1052         // Don't change the scrollbar range if there are no traces
1053         if (extents.first != extents.second)
1054                 vscrollbar->setRange(extents.first - areaSize.height(),
1055                         extents.second);
1056
1057         if (scroll_needs_defaults_) {
1058                 set_scroll_default();
1059                 scroll_needs_defaults_ = false;
1060         }
1061 }
1062
1063 void View::reset_scroll()
1064 {
1065         scrollarea_->verticalScrollBar()->setRange(0, 0);
1066 }
1067
1068 void View::set_scroll_default()
1069 {
1070         assert(viewport_);
1071
1072         const QSize areaSize = viewport_->size();
1073
1074         const pair<int, int> extents = v_extents();
1075         const int trace_height = extents.second - extents.first;
1076
1077         // Do all traces fit in the view?
1078         if (areaSize.height() >= trace_height)
1079                 // Center all traces vertically
1080                 set_v_offset(extents.first -
1081                         ((areaSize.height() - trace_height) / 2));
1082         else
1083                 // Put the first trace at the top, letting the bottom ones overflow
1084                 set_v_offset(extents.first);
1085 }
1086
1087 void View::determine_if_header_was_shrunk()
1088 {
1089         const int header_pane_width = splitter_->sizes().front();
1090         const int header_width = header_->extended_size_hint().width();
1091
1092         // Allow for a slight margin of error so that we also accept
1093         // slight differences when e.g. a label name change increased
1094         // the overall width
1095         header_was_shrunk_ = (header_pane_width < (header_width - 10));
1096 }
1097
1098 void View::resize_header_to_fit()
1099 {
1100         // Setting the maximum width of the header widget doesn't work as
1101         // expected because the splitter would allow the user to make the
1102         // pane wider than that, creating empty space as a result.
1103         // To make this work, we stricly enforce the maximum width by
1104         // expanding the header unless the user shrunk it on purpose.
1105         // As we're then setting the width of the header pane, we set the
1106         // splitter to the maximum allowed position.
1107
1108         int splitter_area_width = 0;
1109         for (int w : splitter_->sizes())
1110                 splitter_area_width += w;
1111
1112         // Make sure the header has enough horizontal space to show all labels fully
1113         QList<int> pane_sizes;
1114         pane_sizes.push_back(header_->extended_size_hint().width());
1115         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1116         splitter_->setSizes(pane_sizes);
1117 }
1118
1119 void View::update_layout()
1120 {
1121         update_scroll();
1122 }
1123
1124 TraceTreeItemOwner* View::find_prevalent_trace_group(
1125         const shared_ptr<sigrok::ChannelGroup> &group,
1126         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1127                 &signal_map)
1128 {
1129         assert(group);
1130
1131         unordered_set<TraceTreeItemOwner*> owners;
1132         vector<TraceTreeItemOwner*> owner_list;
1133
1134         // Make a set and a list of all the owners
1135         for (const auto &channel : group->channels()) {
1136                 for (auto entry : signal_map) {
1137                         if (entry.first->channel() == channel) {
1138                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1139                                 owner_list.push_back(o);
1140                                 owners.insert(o);
1141                         }
1142                 }
1143         }
1144
1145         // Iterate through the list of owners, and find the most prevalent
1146         size_t max_prevalence = 0;
1147         TraceTreeItemOwner *prevalent_owner = nullptr;
1148         for (TraceTreeItemOwner *owner : owners) {
1149                 const size_t prevalence = count_if(
1150                         owner_list.begin(), owner_list.end(),
1151                         [&](TraceTreeItemOwner *o) { return o == owner; });
1152                 if (prevalence > max_prevalence) {
1153                         max_prevalence = prevalence;
1154                         prevalent_owner = owner;
1155                 }
1156         }
1157
1158         return prevalent_owner;
1159 }
1160
1161 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1162         const vector< shared_ptr<sigrok::Channel> > &channels,
1163         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1164                 &signal_map,
1165         set< shared_ptr<Trace> > &add_list)
1166 {
1167         vector< shared_ptr<Trace> > filtered_traces;
1168
1169         for (const auto &channel : channels) {
1170                 for (auto entry : signal_map) {
1171                         if (entry.first->channel() == channel) {
1172                                 shared_ptr<Trace> trace = entry.second;
1173                                 const auto list_iter = add_list.find(trace);
1174                                 if (list_iter == add_list.end())
1175                                         continue;
1176
1177                                 filtered_traces.push_back(trace);
1178                                 add_list.erase(list_iter);
1179                         }
1180                 }
1181         }
1182
1183         return filtered_traces;
1184 }
1185
1186 void View::determine_time_unit()
1187 {
1188         // Check whether we know the sample rate and hence can use time as the unit
1189         if (time_unit_ == util::TimeUnit::Samples) {
1190                 // Check all signals but...
1191                 for (const shared_ptr<Signal> signal : signals_) {
1192                         const shared_ptr<SignalData> data = signal->data();
1193
1194                         // ...only check first segment of each
1195                         const vector< shared_ptr<Segment> > segments = data->segments();
1196                         if (!segments.empty())
1197                                 if (segments[0]->samplerate()) {
1198                                         set_time_unit(util::TimeUnit::Time);
1199                                         break;
1200                                 }
1201                 }
1202         }
1203 }
1204
1205 bool View::eventFilter(QObject *object, QEvent *event)
1206 {
1207         const QEvent::Type type = event->type();
1208         if (type == QEvent::MouseMove) {
1209
1210                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1211                 if (object == viewport_)
1212                         hover_point_ = mouse_event->pos();
1213                 else if (object == ruler_)
1214                         hover_point_ = QPoint(mouse_event->x(), 0);
1215                 else if (object == header_)
1216                         hover_point_ = QPoint(0, mouse_event->y());
1217                 else
1218                         hover_point_ = QPoint(-1, -1);
1219
1220                 update_hover_point();
1221
1222         } else if (type == QEvent::Leave) {
1223                 hover_point_ = QPoint(-1, -1);
1224                 update_hover_point();
1225         } else if (type == QEvent::Show) {
1226
1227                 // This is somewhat of a hack, unfortunately. We cannot use
1228                 // set_v_offset() from within restore_settings() as the view
1229                 // at that point is neither visible nor properly sized.
1230                 // This is the least intrusive workaround I could come up
1231                 // with: set the vertical offset (or scroll defaults) when
1232                 // the view is shown, which happens after all widgets were
1233                 // resized to their final sizes.
1234                 update_layout();
1235
1236                 if (settings_restored_)
1237                         determine_if_header_was_shrunk();
1238                 else
1239                         resize_header_to_fit();
1240
1241                 if (scroll_needs_defaults_) {
1242                         set_scroll_default();
1243                         scroll_needs_defaults_ = false;
1244                 }
1245
1246                 if (saved_v_offset_) {
1247                         set_v_offset(saved_v_offset_);
1248                         saved_v_offset_ = 0;
1249                 }
1250         }
1251
1252         return QObject::eventFilter(object, event);
1253 }
1254
1255 void View::contextMenuEvent(QContextMenuEvent *event)
1256 {
1257         QPoint pos = event->pos() - QPoint(0, ruler_->sizeHint().height());
1258
1259         const shared_ptr<ViewItem> r = viewport_->get_mouse_over_item(pos);
1260         if (!r)
1261                 return;
1262
1263         QMenu *menu = r->create_view_context_menu(this, pos);
1264         if (menu)
1265                 menu->exec(event->globalPos());
1266 }
1267
1268 void View::resizeEvent(QResizeEvent* event)
1269 {
1270         // Only adjust the top margin if we shrunk vertically
1271         if (event->size().height() < event->oldSize().height())
1272                 adjust_top_margin();
1273
1274         update_layout();
1275 }
1276
1277 void View::update_hover_point()
1278 {
1279         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1280                 list_by_type<TraceTreeItem>());
1281         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1282                 r->hover_point_changed(hover_point_);
1283
1284         hover_point_changed(hover_point_);
1285 }
1286
1287 void View::row_item_appearance_changed(bool label, bool content)
1288 {
1289         if (label)
1290                 header_->update();
1291         if (content)
1292                 viewport_->update();
1293 }
1294
1295 void View::time_item_appearance_changed(bool label, bool content)
1296 {
1297         if (label) {
1298                 ruler_->update();
1299
1300                 // Make sure the header pane width is updated, too
1301                 update_layout();
1302         }
1303
1304         if (content)
1305                 viewport_->update();
1306 }
1307
1308 void View::extents_changed(bool horz, bool vert)
1309 {
1310         sticky_events_ |=
1311                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1312                 (vert ? TraceTreeItemVExtentsChanged : 0);
1313
1314         lazy_event_handler_.stop();
1315         lazy_event_handler_.start();
1316 }
1317
1318 void View::on_signal_name_changed()
1319 {
1320         if (!header_was_shrunk_)
1321                 resize_header_to_fit();
1322 }
1323
1324 void View::on_splitter_moved()
1325 {
1326         // The header can only shrink when the splitter is moved manually
1327         determine_if_header_was_shrunk();
1328
1329         if (!header_was_shrunk_)
1330                 resize_header_to_fit();
1331 }
1332
1333 void View::h_scroll_value_changed(int value)
1334 {
1335         if (updating_scroll_)
1336                 return;
1337
1338         // Disable sticky scrolling when user moves the horizontal scroll bar
1339         // during a running acquisition
1340         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1341                 sticky_scrolling_ = false;
1342                 sticky_scrolling_changed(false);
1343         }
1344
1345         const int range = scrollarea_->horizontalScrollBar()->maximum();
1346         if (range < MaxScrollValue)
1347                 set_offset(scale_ * value);
1348         else {
1349                 double length = 0;
1350                 Timestamp offset;
1351                 get_scroll_layout(length, offset);
1352                 set_offset(scale_ * length * value / MaxScrollValue);
1353         }
1354
1355         ruler_->update();
1356         viewport_->update();
1357 }
1358
1359 void View::v_scroll_value_changed()
1360 {
1361         header_->update();
1362         viewport_->update();
1363 }
1364
1365 void View::signals_changed()
1366 {
1367         using sigrok::Channel;
1368
1369         vector< shared_ptr<Channel> > channels;
1370         shared_ptr<sigrok::Device> sr_dev;
1371         bool signals_added_or_removed = false;
1372
1373         // Do we need to set the vertical scrollbar to its default position later?
1374         // We do if there are no traces, i.e. the scroll bar has no range set
1375         bool reset_scrollbar =
1376                 (scrollarea_->verticalScrollBar()->minimum() ==
1377                         scrollarea_->verticalScrollBar()->maximum());
1378
1379         if (!session_.device()) {
1380                 reset_scroll();
1381                 signals_.clear();
1382         } else {
1383                 sr_dev = session_.device()->device();
1384                 assert(sr_dev);
1385                 channels = sr_dev->channels();
1386         }
1387
1388         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1389
1390         // Make a list of traces that are being added, and a list of traces
1391         // that are being removed
1392         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1393         const set<shared_ptr<Trace>> prev_traces(
1394                 prev_trace_list.begin(), prev_trace_list.end());
1395
1396         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1397
1398 #ifdef ENABLE_DECODE
1399         traces.insert(decode_traces_.begin(), decode_traces_.end());
1400 #endif
1401
1402         set< shared_ptr<Trace> > add_traces;
1403         set_difference(traces.begin(), traces.end(),
1404                 prev_traces.begin(), prev_traces.end(),
1405                 inserter(add_traces, add_traces.begin()));
1406
1407         set< shared_ptr<Trace> > remove_traces;
1408         set_difference(prev_traces.begin(), prev_traces.end(),
1409                 traces.begin(), traces.end(),
1410                 inserter(remove_traces, remove_traces.begin()));
1411
1412         // Make a look-up table of sigrok Channels to pulseview Signals
1413         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1414                 signal_map;
1415         for (const shared_ptr<Signal> &sig : signals_)
1416                 signal_map[sig->base()] = sig;
1417
1418         // Populate channel groups
1419         if (sr_dev)
1420                 for (auto entry : sr_dev->channel_groups()) {
1421                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1422
1423                         if (group->channels().size() <= 1)
1424                                 continue;
1425
1426                         // Find best trace group to add to
1427                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1428                                 group, signal_map);
1429
1430                         // If there is no trace group, create one
1431                         shared_ptr<TraceGroup> new_trace_group;
1432                         if (!owner) {
1433                                 new_trace_group.reset(new TraceGroup());
1434                                 owner = new_trace_group.get();
1435                         }
1436
1437                         // Extract traces for the trace group, removing them from
1438                         // the add list
1439                         const vector< shared_ptr<Trace> > new_traces_in_group =
1440                                 extract_new_traces_for_channels(group->channels(),
1441                                         signal_map, add_traces);
1442
1443                         // Add the traces to the group
1444                         const pair<int, int> prev_v_extents = owner->v_extents();
1445                         int offset = prev_v_extents.second - prev_v_extents.first;
1446                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1447                                 assert(trace);
1448                                 owner->add_child_item(trace);
1449
1450                                 const pair<int, int> extents = trace->v_extents();
1451                                 if (trace->enabled())
1452                                         offset += -extents.first;
1453                                 trace->force_to_v_offset(offset);
1454                                 if (trace->enabled())
1455                                         offset += extents.second;
1456                         }
1457
1458                         if (new_trace_group) {
1459                                 // Assign proper vertical offsets to each channel in the group
1460                                 new_trace_group->restack_items();
1461
1462                                 // If this is a new group, enqueue it in the new top level
1463                                 // items list
1464                                 if (!new_traces_in_group.empty())
1465                                         new_top_level_items.push_back(new_trace_group);
1466                         }
1467                 }
1468
1469         // Enqueue the remaining logic channels in a group
1470         vector< shared_ptr<Channel> > logic_channels;
1471         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1472                 [](const shared_ptr<Channel>& c) {
1473                         return c->type() == sigrok::ChannelType::LOGIC; });
1474
1475         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1476                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1477
1478         if (non_grouped_logic_signals.size() > 0) {
1479                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1480                         make_shared<TraceGroup>());
1481                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1482                         non_grouped_trace_group->add_child_item(trace);
1483
1484                 non_grouped_trace_group->restack_items();
1485                 new_top_level_items.push_back(non_grouped_trace_group);
1486         }
1487
1488         // Enqueue the remaining channels as free ungrouped traces
1489         const vector< shared_ptr<Trace> > new_top_level_signals =
1490                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1491         new_top_level_items.insert(new_top_level_items.end(),
1492                 new_top_level_signals.begin(), new_top_level_signals.end());
1493
1494         // Enqueue any remaining traces i.e. decode traces
1495         new_top_level_items.insert(new_top_level_items.end(),
1496                 add_traces.begin(), add_traces.end());
1497
1498         // Remove any removed traces
1499         for (shared_ptr<Trace> trace : remove_traces) {
1500                 TraceTreeItemOwner *const owner = trace->owner();
1501                 assert(owner);
1502                 owner->remove_child_item(trace);
1503                 signals_added_or_removed = true;
1504         }
1505
1506         // Remove any empty trace groups
1507         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1508                 if (group->child_items().size() == 0) {
1509                         remove_child_item(group);
1510                         group.reset();
1511                 }
1512
1513         // Add and position the pending top levels items
1514         int offset = v_extents().second;
1515         for (auto item : new_top_level_items) {
1516                 add_child_item(item);
1517
1518                 // Position the item after the last item or at the top if there is none
1519                 const pair<int, int> extents = item->v_extents();
1520
1521                 if (item->enabled())
1522                         offset += -extents.first;
1523
1524                 item->force_to_v_offset(offset);
1525
1526                 if (item->enabled())
1527                         offset += extents.second;
1528                 signals_added_or_removed = true;
1529         }
1530
1531
1532         if (signals_added_or_removed && !header_was_shrunk_)
1533                 resize_header_to_fit();
1534
1535         update_layout();
1536
1537         header_->update();
1538         viewport_->update();
1539
1540         if (reset_scrollbar)
1541                 set_scroll_default();
1542 }
1543
1544 void View::capture_state_updated(int state)
1545 {
1546         GlobalSettings settings;
1547
1548         if (state == Session::Running) {
1549                 set_time_unit(util::TimeUnit::Samples);
1550
1551                 trigger_markers_.clear();
1552
1553                 scale_at_acq_start_ = scale_;
1554                 offset_at_acq_start_ = offset_;
1555
1556                 // Activate "always zoom to fit" if the setting is enabled and we're
1557                 // the main view of this session (other trace views may be used for
1558                 // zooming and we don't want to mess them up)
1559                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1560                 if (is_main_view_ && state) {
1561                         always_zoom_to_fit_ = true;
1562                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1563                 }
1564
1565                 // Enable sticky scrolling if the setting is enabled
1566                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1567
1568                 // Reset all traces to segment 0
1569                 current_segment_ = 0;
1570                 set_current_segment(current_segment_);
1571         }
1572
1573         if (state == Session::Stopped) {
1574                 // After acquisition has stopped we need to re-calculate the ticks once
1575                 // as it's otherwise done when the user pans or zooms, which is too late
1576                 calculate_tick_spacing();
1577
1578                 // Reset "always zoom to fit", the acquisition has stopped
1579                 if (always_zoom_to_fit_) {
1580                         // Perform a final zoom-to-fit before disabling
1581                         zoom_fit(always_zoom_to_fit_);
1582                         always_zoom_to_fit_ = false;
1583                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1584                 }
1585
1586                 bool zoom_to_fit_after_acq =
1587                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1588
1589                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1590                 // we didn't restore settings in the meanwhile
1591                 if (zoom_to_fit_after_acq &&
1592                         !suppress_zoom_to_fit_after_acq_ &&
1593                         (scale_ == scale_at_acq_start_) &&
1594                         (offset_ == offset_at_acq_start_))
1595                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1596
1597                 suppress_zoom_to_fit_after_acq_ = false;
1598         }
1599 }
1600
1601 void View::on_new_segment(int new_segment_id)
1602 {
1603         on_segment_changed(new_segment_id);
1604 }
1605
1606 void View::on_segment_completed(int segment_id)
1607 {
1608         on_segment_changed(segment_id);
1609 }
1610
1611 void View::on_segment_changed(int segment)
1612 {
1613         switch (segment_display_mode_) {
1614         case Trace::ShowLastSegmentOnly:
1615         case Trace::ShowSingleSegmentOnly:
1616                 set_current_segment(segment);
1617                 break;
1618
1619         case Trace::ShowLastCompleteSegmentOnly:
1620                 // Only update if all segments are complete
1621                 if (session_.all_segments_complete(segment))
1622                         set_current_segment(segment);
1623                 break;
1624
1625         case Trace::ShowAllSegments:
1626         case Trace::ShowAccumulatedIntensity:
1627         default:
1628                 break;
1629         }
1630 }
1631
1632 void View::on_settingViewTriggerIsZeroTime_changed(const QVariant new_value)
1633 {
1634         if (new_value.toBool()) {
1635                 // The first trigger for this segment is used as the zero position
1636                 vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
1637                 if (triggers.size() > 0)
1638                         set_zero_position(triggers.front());
1639         } else
1640                 reset_zero_position();
1641 }
1642
1643 void View::perform_delayed_view_update()
1644 {
1645         if (always_zoom_to_fit_) {
1646                 zoom_fit(true);
1647         } else if (sticky_scrolling_) {
1648                 // Make right side of the view sticky
1649                 double length = 0;
1650                 Timestamp offset;
1651                 get_scroll_layout(length, offset);
1652
1653                 const QSize areaSize = viewport_->size();
1654                 length = max(length - areaSize.width(), 0.0);
1655
1656                 set_offset(scale_ * length);
1657         }
1658
1659         determine_time_unit();
1660         update_scroll();
1661         ruler_->update();
1662         viewport_->update();
1663 }
1664
1665 void View::process_sticky_events()
1666 {
1667         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1668                 update_layout();
1669         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1670                 restack_all_trace_tree_items();
1671                 update_scroll();
1672         }
1673
1674         // Clear the sticky events
1675         sticky_events_ = 0;
1676 }
1677
1678 } // namespace trace
1679 } // namespace views
1680 } // namespace pv