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
 128         // Note: Place defaults in View::reset_view_state(), not here
 129         splitter_(new QSplitter()),
 130         header_was_shrunk_(false),  // The splitter remains unchanged after a reset, so this goes here
 131         sticky_scrolling_(false)  // Default setting is set in MainWindow::setup_ui()
 132 {
 133         QVBoxLayout *root_layout = new QVBoxLayout(this);
 134         root_layout->setContentsMargins(0, 0, 0, 0);
 135         root_layout->addWidget(splitter_);
 136
 137         viewport_ = new Viewport(*this);
 138         scrollarea_ = new CustomScrollArea(splitter_);
 139         scrollarea_->setViewport(viewport_);
 140         scrollarea_->setFrameShape(QFrame::NoFrame);
 141
 142         ruler_ = new Ruler(*this);
 143
 144         header_ = new Header(*this);
 145         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 146
 147         // We put the header into a simple layout so that we can add the top margin,
 148         // allowing us to make it line up with the bottom of the ruler
 149         QWidget *header_container = new QWidget();
 150         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 151         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 152         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 153         header_layout->addWidget(header_);
 154
 155         // To let the ruler and scrollarea be on the same split pane, we need a layout
 156         QWidget *trace_container = new QWidget();
 157         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 158         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 159         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 160         trace_layout->setContentsMargins(0, 0, 0, 0);
 161         trace_layout->addWidget(ruler_);
 162         trace_layout->addWidget(scrollarea_);
 163
 164         splitter_->addWidget(header_container);
 165         splitter_->addWidget(trace_container);
 166         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 167         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 168         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 169         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 170         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 171         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 172
 173         viewport_->installEventFilter(this);
 174         ruler_->installEventFilter(this);
 175         header_->installEventFilter(this);
 176
 177         // Set up settings and event handlers
 178         GlobalSettings settings;
 179         colored_bg_ = settings.value(GlobalSettings::Key_View_ColoredBG).toBool();
 180
 181         GlobalSettings::add_change_handler(this);
 182
 183         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 184                 this, SLOT(h_scroll_value_changed(int)));
 185         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 186                 this, SLOT(v_scroll_value_changed()));
 187
 188         connect(header_, SIGNAL(selection_changed()),
 189                 ruler_, SLOT(clear_selection()));
 190         connect(ruler_, SIGNAL(selection_changed()),
 191                 header_, SLOT(clear_selection()));
 192
 193         connect(header_, SIGNAL(selection_changed()),
 194                 this, SIGNAL(selection_changed()));
 195         connect(ruler_, SIGNAL(selection_changed()),
 196                 this, SIGNAL(selection_changed()));
 197
 198         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 199                 this, SLOT(on_splitter_moved()));
 200
 201         connect(&lazy_event_handler_, SIGNAL(timeout()),
 202                 this, SLOT(process_sticky_events()));
 203         lazy_event_handler_.setSingleShot(true);
 204
 205         // Trigger the initial event manually. The default device has signals
 206         // which were created before this object came into being
 207         signals_changed();
 208
 209         // make sure the transparent widgets are on the top
 210         ruler_->raise();
 211         header_->raise();
 212
 213         reset_view_state();
 214 }
 215
 216 View::~View()
 217 {
 218         GlobalSettings::remove_change_handler(this);
 219 }
 220
 221 void View::reset_view_state()
 222 {
 223         ViewBase::reset_view_state();
 224
 225         segment_display_mode_ = Trace::ShowLastSegmentOnly;
 226         segment_selectable_ = false;
 227         scale_ = 1e-3;
 228         offset_ = 0;
 229         ruler_offset_ = 0;
 230         updating_scroll_ = false;
 231         settings_restored_ = false;
 232         always_zoom_to_fit_ = false;
 233         tick_period_ = 0;
 234         tick_prefix_ = pv::util::SIPrefix::yocto;
 235         tick_precision_ = 0;
 236         time_unit_ = util::TimeUnit::Time;
 237         show_cursors_ = false;
 238         cursors_ = make_shared<CursorPair>(*this);
 239         next_flag_text_ = 'A';
 240         trigger_markers_.clear();
 241         hover_point_ = QPoint(-1, -1);
 242         scroll_needs_defaults_ = true;
 243         saved_v_offset_ = 0;
 244         scale_at_acq_start_ = 0;
 245         offset_at_acq_start_ = 0;
 246         suppress_zoom_to_fit_after_acq_ = false;
 247
 248         show_cursors_ = false;
 249         flags_.clear();
 250
 251         // Update the zoom state
 252         calculate_tick_spacing();
 253
 254         // Make sure the standard bar's segment selector is in sync
 255         set_segment_display_mode(segment_display_mode_);
 256 }
 257
 258 Session& View::session()
 259 {
 260         return session_;
 261 }
 262
 263 const Session& View::session() const
 264 {
 265         return session_;
 266 }
 267
 268 unordered_set< shared_ptr<Signal> > View::signals() const
 269 {
 270         return signals_;
 271 }
 272
 273 void View::clear_signals()
 274 {
 275         ViewBase::clear_signalbases();
 276         signals_.clear();
 277 }
 278
 279 void View::add_signal(const shared_ptr<Signal> signal)
 280 {
 281         ViewBase::add_signalbase(signal->base());
 282         signals_.insert(signal);
 283
 284         signal->set_segment_display_mode(segment_display_mode_);
 285         signal->set_current_segment(current_segment_);
 286
 287         connect(signal->base().get(), SIGNAL(name_changed(const QString&)),
 288                 this, SLOT(on_signal_name_changed()));
 289 }
 290
 291 #ifdef ENABLE_DECODE
 292 void View::clear_decode_signals()
 293 {
 294         decode_traces_.clear();
 295 }
 296
 297 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 298 {
 299         shared_ptr<DecodeTrace> d(
 300                 new DecodeTrace(session_, signal, decode_traces_.size()));
 301         decode_traces_.push_back(d);
 302
 303         d->set_segment_display_mode(segment_display_mode_);
 304         d->set_current_segment(current_segment_);
 305
 306         connect(signal.get(), SIGNAL(name_changed(const QString&)),
 307                 this, SLOT(on_signal_name_changed()));
 308 }
 309
 310 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 311 {
 312         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 313                 if ((*i)->base() == signal) {
 314                         decode_traces_.erase(i);
 315                         signals_changed();
 316                         return;
 317                 }
 318 }
 319 #endif
 320
 321 View* View::view()
 322 {
 323         return this;
 324 }
 325
 326 const View* View::view() const
 327 {
 328         return this;
 329 }
 330
 331 Viewport* View::viewport()
 332 {
 333         return viewport_;
 334 }
 335
 336 const Viewport* View::viewport() const
 337 {
 338         return viewport_;
 339 }
 340
 341 void View::save_settings(QSettings &settings) const
 342 {
 343         settings.setValue("scale", scale_);
 344         settings.setValue("v_offset",
 345                 scrollarea_->verticalScrollBar()->sliderPosition());
 346
 347         settings.setValue("splitter_state", splitter_->saveState());
 348         settings.setValue("segment_display_mode", segment_display_mode_);
 349
 350         {
 351                 stringstream ss;
 352                 boost::archive::text_oarchive oa(ss);
 353                 oa << boost::serialization::make_nvp("ruler_shift", ruler_shift_);
 354                 settings.setValue("ruler_shift", QString::fromStdString(ss.str()));
 355         }
 356         {
 357                 stringstream ss;
 358                 boost::archive::text_oarchive oa(ss);
 359                 oa << boost::serialization::make_nvp("offset", offset_);
 360                 settings.setValue("offset", QString::fromStdString(ss.str()));
 361         }
 362
 363         for (shared_ptr<Signal> signal : signals_) {
 364                 settings.beginGroup(signal->base()->internal_name());
 365                 signal->save_settings(settings);
 366                 settings.endGroup();
 367         }
 368 }
 369
 370 void View::restore_settings(QSettings &settings)
 371 {
 372         // Note: It is assumed that this function is only called once,
 373         // immediately after restoring a previous session.
 374
 375         if (settings.contains("scale"))
 376                 set_scale(settings.value("scale").toDouble());
 377
 378         if (settings.contains("ruler_shift")) {
 379                 util::Timestamp shift;
 380                 stringstream ss;
 381                 ss << settings.value("ruler_shift").toString().toStdString();
 382
 383                 try {
 384                         boost::archive::text_iarchive ia(ss);
 385                         ia >> boost::serialization::make_nvp("ruler_shift", shift);
 386                         ruler_shift_ = shift;
 387                 } catch (boost::archive::archive_exception) {
 388                         qDebug() << "Could not restore the view ruler shift";
 389                 }
 390         }
 391
 392         if (settings.contains("offset")) {
 393                 util::Timestamp offset;
 394                 stringstream ss;
 395                 ss << settings.value("offset").toString().toStdString();
 396
 397                 try {
 398                         boost::archive::text_iarchive ia(ss);
 399                         ia >> boost::serialization::make_nvp("offset", offset);
 400                         // This also updates ruler_offset_
 401                         set_offset(offset);
 402                 } catch (boost::archive::archive_exception) {
 403                         qDebug() << "Could not restore the view offset";
 404                 }
 405         }
 406
 407         if (settings.contains("splitter_state"))
 408                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 409
 410         if (settings.contains("segment_display_mode"))
 411                 set_segment_display_mode(
 412                         (Trace::SegmentDisplayMode)(settings.value("segment_display_mode").toInt()));
 413
 414         for (shared_ptr<Signal> signal : signals_) {
 415                 settings.beginGroup(signal->base()->internal_name());
 416                 signal->restore_settings(settings);
 417                 settings.endGroup();
 418         }
 419
 420         if (settings.contains("v_offset")) {
 421                 saved_v_offset_ = settings.value("v_offset").toInt();
 422                 set_v_offset(saved_v_offset_);
 423                 scroll_needs_defaults_ = false;
 424                 // Note: see eventFilter() for additional information
 425         }
 426
 427         settings_restored_ = true;
 428         suppress_zoom_to_fit_after_acq_ = true;
 429
 430         // Update the ruler so that it uses the new scale
 431         calculate_tick_spacing();
 432 }
 433
 434 vector< shared_ptr<TimeItem> > View::time_items() const
 435 {
 436         const vector<shared_ptr<Flag>> f(flags());
 437         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 438
 439         if (cursors_) {
 440                 items.push_back(cursors_);
 441                 items.push_back(cursors_->first());
 442                 items.push_back(cursors_->second());
 443         }
 444
 445         for (auto trigger_marker : trigger_markers_)
 446                 items.push_back(trigger_marker);
 447
 448         return items;
 449 }
 450
 451 double View::scale() const
 452 {
 453         return scale_;
 454 }
 455
 456 void View::set_scale(double scale)
 457 {
 458         if (scale_ != scale) {
 459                 scale_ = scale;
 460                 scale_changed();
 461         }
 462 }
 463
 464 void View::set_offset(const pv::util::Timestamp& offset, bool force_update)
 465 {
 466         if ((offset_ != offset) || force_update) {
 467                 offset_ = offset;
 468                 ruler_offset_ = offset_ + ruler_shift_;
 469                 offset_changed();
 470         }
 471 }
 472
 473 const Timestamp& View::offset() const
 474 {
 475         return offset_;
 476 }
 477
 478 const Timestamp& View::ruler_offset() const
 479 {
 480         return ruler_offset_;
 481 }
 482
 483 void View::set_zero_position(pv::util::Timestamp& position)
 484 {
 485         ruler_shift_ = -position;
 486
 487         // Force an immediate update of the offsets
 488         set_offset(offset_, true);
 489         ruler_->update();
 490 }
 491
 492 void View::reset_zero_position()
 493 {
 494         ruler_shift_ = 0;
 495
 496         // Force an immediate update of the offsets
 497         set_offset(offset_, true);
 498         ruler_->update();
 499 }
 500
 501 int View::owner_visual_v_offset() const
 502 {
 503         return -scrollarea_->verticalScrollBar()->sliderPosition();
 504 }
 505
 506 void View::set_v_offset(int offset)
 507 {
 508         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 509         header_->update();
 510         viewport_->update();
 511 }
 512
 513 unsigned int View::depth() const
 514 {
 515         return 0;
 516 }
 517
 518 uint32_t View::current_segment() const
 519 {
 520         return current_segment_;
 521 }
 522
 523 pv::util::SIPrefix View::tick_prefix() const
 524 {
 525         return tick_prefix_;
 526 }
 527
 528 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 529 {
 530         if (tick_prefix_ != tick_prefix) {
 531                 tick_prefix_ = tick_prefix;
 532                 tick_prefix_changed();
 533         }
 534 }
 535
 536 unsigned int View::tick_precision() const
 537 {
 538         return tick_precision_;
 539 }
 540
 541 void View::set_tick_precision(unsigned tick_precision)
 542 {
 543         if (tick_precision_ != tick_precision) {
 544                 tick_precision_ = tick_precision;
 545                 tick_precision_changed();
 546         }
 547 }
 548
 549 const pv::util::Timestamp& View::tick_period() const
 550 {
 551         return tick_period_;
 552 }
 553
 554 unsigned int View::minor_tick_count() const
 555 {
 556         return minor_tick_count_;
 557 }
 558
 559 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 560 {
 561         if (tick_period_ != tick_period) {
 562                 tick_period_ = tick_period;
 563                 tick_period_changed();
 564         }
 565 }
 566
 567 TimeUnit View::time_unit() const
 568 {
 569         return time_unit_;
 570 }
 571
 572 void View::set_time_unit(pv::util::TimeUnit time_unit)
 573 {
 574         if (time_unit_ != time_unit) {
 575                 time_unit_ = time_unit;
 576                 time_unit_changed();
 577         }
 578 }
 579
 580 void View::set_current_segment(uint32_t segment_id)
 581 {
 582         current_segment_ = segment_id;
 583
 584         for (shared_ptr<Signal> signal : signals_)
 585                 signal->set_current_segment(current_segment_);
 586 #ifdef ENABLE_DECODE
 587         for (shared_ptr<DecodeTrace> dt : decode_traces_)
 588                 dt->set_current_segment(current_segment_);
 589 #endif
 590
 591         vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
 592
 593         trigger_markers_.clear();
 594         for (util::Timestamp timestamp : triggers)
 595                 trigger_markers_.push_back(make_shared<TriggerMarker>(*this, timestamp));
 596
 597         // When enabled, the first trigger for this segment is used as the zero position
 598         GlobalSettings settings;
 599         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 600
 601         if (trigger_is_zero_time && (triggers.size() > 0))
 602                 set_zero_position(triggers.front());
 603
 604         viewport_->update();
 605
 606         segment_changed(segment_id);
 607 }
 608
 609 bool View::segment_is_selectable() const
 610 {
 611         return segment_selectable_;
 612 }
 613
 614 Trace::SegmentDisplayMode View::segment_display_mode() const
 615 {
 616         return segment_display_mode_;
 617 }
 618
 619 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 620 {
 621         trigger_markers_.clear();
 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::zoom_one_to_one()
 703 {
 704         using pv::data::SignalData;
 705
 706         // Make a set of all the visible data objects
 707         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 708         if (visible_data.empty())
 709                 return;
 710
 711         assert(viewport_);
 712         const int w = viewport_->width();
 713         if (w <= 0)
 714                 return;
 715
 716         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 717 }
 718
 719 void View::set_scale_offset(double scale, const Timestamp& offset)
 720 {
 721         // Disable sticky scrolling / always zoom to fit when acquisition runs
 722         // and user drags the viewport
 723         if ((scale_ == scale) && (offset_ != offset) &&
 724                         (session_.get_capture_state() == Session::Running)) {
 725
 726                 if (sticky_scrolling_) {
 727                         sticky_scrolling_ = false;
 728                         sticky_scrolling_changed(false);
 729                 }
 730
 731                 if (always_zoom_to_fit_) {
 732                         always_zoom_to_fit_ = false;
 733                         always_zoom_to_fit_changed(false);
 734                 }
 735         }
 736
 737         set_scale(scale);
 738         set_offset(offset);
 739
 740         calculate_tick_spacing();
 741
 742         update_scroll();
 743         ruler_->update();
 744         viewport_->update();
 745 }
 746
 747 set< shared_ptr<SignalData> > View::get_visible_data() const
 748 {
 749         // Make a set of all the visible data objects
 750         set< shared_ptr<SignalData> > visible_data;
 751         for (const shared_ptr<Signal> sig : signals_)
 752                 if (sig->enabled())
 753                         visible_data.insert(sig->data());
 754
 755         return visible_data;
 756 }
 757
 758 pair<Timestamp, Timestamp> View::get_time_extents() const
 759 {
 760         boost::optional<Timestamp> left_time, right_time;
 761         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 762         for (const shared_ptr<SignalData> d : visible_data) {
 763                 const vector< shared_ptr<Segment> > segments = d->segments();
 764                 for (const shared_ptr<Segment> &s : segments) {
 765                         double samplerate = s->samplerate();
 766                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 767
 768                         const Timestamp start_time = s->start_time();
 769                         left_time = left_time ?
 770                                 min(*left_time, start_time) :
 771                                                 start_time;
 772                         right_time = right_time ?
 773                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 774                                                  start_time + d->max_sample_count() / samplerate;
 775                 }
 776         }
 777
 778         if (!left_time || !right_time)
 779                 return make_pair(0, 0);
 780
 781         assert(*left_time < *right_time);
 782         return make_pair(*left_time, *right_time);
 783 }
 784
 785 void View::enable_show_sampling_points(bool state)
 786 {
 787         (void)state;
 788
 789         viewport_->update();
 790 }
 791
 792 void View::enable_show_analog_minor_grid(bool state)
 793 {
 794         (void)state;
 795
 796         viewport_->update();
 797 }
 798
 799 void View::enable_colored_bg(bool state)
 800 {
 801         colored_bg_ = state;
 802         viewport_->update();
 803 }
 804
 805 bool View::colored_bg() const
 806 {
 807         return colored_bg_;
 808 }
 809
 810 bool View::cursors_shown() const
 811 {
 812         return show_cursors_;
 813 }
 814
 815 void View::show_cursors(bool show)
 816 {
 817         show_cursors_ = show;
 818         ruler_->update();
 819         viewport_->update();
 820 }
 821
 822 void View::centre_cursors()
 823 {
 824         if (cursors_) {
 825                 const double time_width = scale_ * viewport_->width();
 826                 cursors_->first()->set_time(offset_ + time_width * 0.4);
 827                 cursors_->second()->set_time(offset_ + time_width * 0.6);
 828
 829                 ruler_->update();
 830                 viewport_->update();
 831         }
 832 }
 833
 834 shared_ptr<CursorPair> View::cursors() const
 835 {
 836         return cursors_;
 837 }
 838
 839 void View::add_flag(const Timestamp& time)
 840 {
 841         flags_.push_back(make_shared<Flag>(*this, time,
 842                 QString("%1").arg(next_flag_text_)));
 843
 844         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 845                 (next_flag_text_ + 1);
 846
 847         time_item_appearance_changed(true, true);
 848 }
 849
 850 void View::remove_flag(shared_ptr<Flag> flag)
 851 {
 852         flags_.remove(flag);
 853         time_item_appearance_changed(true, true);
 854 }
 855
 856 vector< shared_ptr<Flag> > View::flags() const
 857 {
 858         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 859         stable_sort(flags.begin(), flags.end(),
 860                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 861                         return a->time() < b->time();
 862                 });
 863
 864         return flags;
 865 }
 866
 867 const QPoint& View::hover_point() const
 868 {
 869         return hover_point_;
 870 }
 871
 872 void View::restack_all_trace_tree_items()
 873 {
 874         // Make a list of owners that is sorted from deepest first
 875         const vector<shared_ptr<TraceTreeItem>> items(
 876                 list_by_type<TraceTreeItem>());
 877         set< TraceTreeItemOwner* > owners;
 878         for (const auto &r : items)
 879                 owners.insert(r->owner());
 880         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 881         sort(sorted_owners.begin(), sorted_owners.end(),
 882                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 883                         return a->depth() > b->depth(); });
 884
 885         // Restack the items recursively
 886         for (auto &o : sorted_owners)
 887                 o->restack_items();
 888
 889         // Animate the items to their destination
 890         for (const auto &i : items)
 891                 i->animate_to_layout_v_offset();
 892 }
 893
 894 void View::on_setting_changed(const QString &key, const QVariant &value)
 895 {
 896         if (key == GlobalSettings::Key_View_TriggerIsZeroTime)
 897                 on_settingViewTriggerIsZeroTime_changed(value);
 898 }
 899
 900 void View::trigger_event(int segment_id, util::Timestamp location)
 901 {
 902         // TODO This doesn't work if we're showing multiple segments at once
 903         if ((uint32_t)segment_id != current_segment_)
 904                 return;
 905
 906         // Set zero location if the Key_View_TriggerIsZeroTime setting is set and
 907         // if this is the first trigger for this segment.
 908         GlobalSettings settings;
 909         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 910
 911         size_t trigger_count = session_.get_triggers(current_segment_).size();
 912
 913         if (trigger_is_zero_time && trigger_count == 1)
 914                 set_zero_position(location);
 915
 916         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 917 }
 918
 919 void View::get_scroll_layout(double &length, Timestamp &offset) const
 920 {
 921         const pair<Timestamp, Timestamp> extents = get_time_extents();
 922         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 923         offset = offset_ / scale_;
 924 }
 925
 926 void View::set_zoom(double scale, int offset)
 927 {
 928         // Reset the "always zoom to fit" feature as the user changed the zoom
 929         always_zoom_to_fit_ = false;
 930         always_zoom_to_fit_changed(false);
 931
 932         const Timestamp cursor_offset = offset_ + scale_ * offset;
 933         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 934         const Timestamp new_offset = cursor_offset - new_scale * offset;
 935         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 936 }
 937
 938 void View::calculate_tick_spacing()
 939 {
 940         const double SpacingIncrement = 10.0f;
 941         const double MinValueSpacing = 40.0f;
 942
 943         // Figure out the highest numeric value visible on a label
 944         const QSize areaSize = viewport_->size();
 945         const Timestamp max_time = max(fabs(offset_),
 946                 fabs(offset_ + scale_ * areaSize.width()));
 947
 948         double min_width = SpacingIncrement;
 949         double label_width, tick_period_width;
 950
 951         QFontMetrics m(QApplication::font());
 952
 953         // Copies of the member variables with the same name, used in the calculation
 954         // and written back afterwards, so that we don't emit signals all the time
 955         // during the calculation.
 956         pv::util::Timestamp tick_period = tick_period_;
 957         pv::util::SIPrefix tick_prefix = tick_prefix_;
 958         unsigned tick_precision = tick_precision_;
 959
 960         do {
 961                 const double min_period = scale_ * min_width;
 962
 963                 const int order = (int)floorf(log10f(min_period));
 964                 const pv::util::Timestamp order_decimal =
 965                         pow(pv::util::Timestamp(10), order);
 966
 967                 // Allow for a margin of error so that a scale unit of 1 can be used.
 968                 // Otherwise, for a SU of 1 the tick period will almost always be below
 969                 // the min_period by a small amount - and thus skipped in favor of 2.
 970                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 971                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 972                 double tp_with_margin;
 973                 unsigned int unit = 0;
 974
 975                 do {
 976                         tp_with_margin = order_decimal.convert_to<double>() *
 977                                 (ScaleUnits[unit++] + tp_margin);
 978                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 979
 980                 minor_tick_count_ = (unit == 2) ? 4 : 5;
 981                 tick_period = order_decimal * ScaleUnits[unit - 1];
 982                 tick_prefix = static_cast<pv::util::SIPrefix>(
 983                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 984
 985                 // Precision is the number of fractional digits required, not
 986                 // taking the prefix into account (and it must never be negative)
 987                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 988
 989                 tick_period_width = (tick_period / scale_).convert_to<double>();
 990
 991                 const QString label_text = Ruler::format_time_with_distance(
 992                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 993
 994                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 995                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 996                                 MinValueSpacing;
 997
 998                 min_width += SpacingIncrement;
 999         } while (tick_period_width < label_width);
1000
1001         set_tick_period(tick_period);
1002         set_tick_prefix(tick_prefix);
1003         set_tick_precision(tick_precision);
1004 }
1005
1006 void View::adjust_top_margin()
1007 {
1008         assert(viewport_);
1009
1010         const QSize areaSize = viewport_->size();
1011
1012         const pair<int, int> extents = v_extents();
1013         const int top_margin = owner_visual_v_offset() + extents.first;
1014         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
1015
1016         // Do we have empty space at the top while the last trace goes out of screen?
1017         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
1018                 const int trace_height = extents.second - extents.first;
1019
1020                 // Center everything vertically if there is enough space
1021                 if (areaSize.height() >= trace_height)
1022                         set_v_offset(extents.first -
1023                                 ((areaSize.height() - trace_height) / 2));
1024                 else
1025                         // Remove the top margin to make as many traces fit on screen as possible
1026                         set_v_offset(extents.first);
1027         }
1028 }
1029
1030 void View::update_scroll()
1031 {
1032         assert(viewport_);
1033         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
1034         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
1035
1036         const QSize areaSize = viewport_->size();
1037
1038         // Set the horizontal scroll bar
1039         double length = 0;
1040         Timestamp offset;
1041         get_scroll_layout(length, offset);
1042         length = max(length - areaSize.width(), 0.0);
1043
1044         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
1045
1046         hscrollbar->setPageStep(areaSize.width() / 2);
1047         hscrollbar->setSingleStep(major_tick_distance);
1048
1049         updating_scroll_ = true;
1050
1051         if (length < MaxScrollValue) {
1052                 hscrollbar->setRange(0, length);
1053                 hscrollbar->setSliderPosition(offset.convert_to<double>());
1054         } else {
1055                 hscrollbar->setRange(0, MaxScrollValue);
1056                 hscrollbar->setSliderPosition(
1057                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
1058         }
1059
1060         updating_scroll_ = false;
1061
1062         // Set the vertical scrollbar
1063         vscrollbar->setPageStep(areaSize.height());
1064         vscrollbar->setSingleStep(areaSize.height() / 8);
1065
1066         const pair<int, int> extents = v_extents();
1067
1068         // Don't change the scrollbar range if there are no traces
1069         if (extents.first != extents.second)
1070                 vscrollbar->setRange(extents.first - areaSize.height(),
1071                         extents.second);
1072
1073         if (scroll_needs_defaults_)
1074                 set_scroll_default();
1075 }
1076
1077 void View::reset_scroll()
1078 {
1079         scrollarea_->verticalScrollBar()->setRange(0, 0);
1080 }
1081
1082 void View::set_scroll_default()
1083 {
1084         assert(viewport_);
1085
1086         const QSize areaSize = viewport_->size();
1087
1088         const pair<int, int> extents = v_extents();
1089         const int trace_height = extents.second - extents.first;
1090
1091         // Do all traces fit in the view?
1092         if (areaSize.height() >= trace_height)
1093                 // Center all traces vertically
1094                 set_v_offset(extents.first -
1095                         ((areaSize.height() - trace_height) / 2));
1096         else
1097                 // Put the first trace at the top, letting the bottom ones overflow
1098                 set_v_offset(extents.first);
1099 }
1100
1101 void View::determine_if_header_was_shrunk()
1102 {
1103         const int header_pane_width = splitter_->sizes().front();
1104         const int header_width = header_->extended_size_hint().width();
1105
1106         // Allow for a slight margin of error so that we also accept
1107         // slight differences when e.g. a label name change increased
1108         // the overall width
1109         header_was_shrunk_ = (header_pane_width < (header_width - 10));
1110 }
1111
1112 void View::resize_header_to_fit()
1113 {
1114         // Setting the maximum width of the header widget doesn't work as
1115         // expected because the splitter would allow the user to make the
1116         // pane wider than that, creating empty space as a result.
1117         // To make this work, we stricly enforce the maximum width by
1118         // expanding the header unless the user shrunk it on purpose.
1119         // As we're then setting the width of the header pane, we set the
1120         // splitter to the maximum allowed position.
1121
1122         int splitter_area_width = 0;
1123         for (int w : splitter_->sizes())
1124                 splitter_area_width += w;
1125
1126         // Make sure the header has enough horizontal space to show all labels fully
1127         QList<int> pane_sizes;
1128         pane_sizes.push_back(header_->extended_size_hint().width());
1129         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1130         splitter_->setSizes(pane_sizes);
1131 }
1132
1133 void View::update_layout()
1134 {
1135         update_scroll();
1136 }
1137
1138 TraceTreeItemOwner* View::find_prevalent_trace_group(
1139         const shared_ptr<sigrok::ChannelGroup> &group,
1140         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1141                 &signal_map)
1142 {
1143         assert(group);
1144
1145         unordered_set<TraceTreeItemOwner*> owners;
1146         vector<TraceTreeItemOwner*> owner_list;
1147
1148         // Make a set and a list of all the owners
1149         for (const auto &channel : group->channels()) {
1150                 for (auto entry : signal_map) {
1151                         if (entry.first->channel() == channel) {
1152                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1153                                 owner_list.push_back(o);
1154                                 owners.insert(o);
1155                         }
1156                 }
1157         }
1158
1159         // Iterate through the list of owners, and find the most prevalent
1160         size_t max_prevalence = 0;
1161         TraceTreeItemOwner *prevalent_owner = nullptr;
1162         for (TraceTreeItemOwner *owner : owners) {
1163                 const size_t prevalence = count_if(
1164                         owner_list.begin(), owner_list.end(),
1165                         [&](TraceTreeItemOwner *o) { return o == owner; });
1166                 if (prevalence > max_prevalence) {
1167                         max_prevalence = prevalence;
1168                         prevalent_owner = owner;
1169                 }
1170         }
1171
1172         return prevalent_owner;
1173 }
1174
1175 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1176         const vector< shared_ptr<sigrok::Channel> > &channels,
1177         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1178                 &signal_map,
1179         set< shared_ptr<Trace> > &add_list)
1180 {
1181         vector< shared_ptr<Trace> > filtered_traces;
1182
1183         for (const auto &channel : channels) {
1184                 for (auto entry : signal_map) {
1185                         if (entry.first->channel() == channel) {
1186                                 shared_ptr<Trace> trace = entry.second;
1187                                 const auto list_iter = add_list.find(trace);
1188                                 if (list_iter == add_list.end())
1189                                         continue;
1190
1191                                 filtered_traces.push_back(trace);
1192                                 add_list.erase(list_iter);
1193                         }
1194                 }
1195         }
1196
1197         return filtered_traces;
1198 }
1199
1200 void View::determine_time_unit()
1201 {
1202         // Check whether we know the sample rate and hence can use time as the unit
1203         if (time_unit_ == util::TimeUnit::Samples) {
1204                 // Check all signals but...
1205                 for (const shared_ptr<Signal> signal : signals_) {
1206                         const shared_ptr<SignalData> data = signal->data();
1207
1208                         // ...only check first segment of each
1209                         const vector< shared_ptr<Segment> > segments = data->segments();
1210                         if (!segments.empty())
1211                                 if (segments[0]->samplerate()) {
1212                                         set_time_unit(util::TimeUnit::Time);
1213                                         break;
1214                                 }
1215                 }
1216         }
1217 }
1218
1219 bool View::eventFilter(QObject *object, QEvent *event)
1220 {
1221         const QEvent::Type type = event->type();
1222         if (type == QEvent::MouseMove) {
1223
1224                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1225                 if (object == viewport_)
1226                         hover_point_ = mouse_event->pos();
1227                 else if (object == ruler_)
1228                         hover_point_ = QPoint(mouse_event->x(), 0);
1229                 else if (object == header_)
1230                         hover_point_ = QPoint(0, mouse_event->y());
1231                 else
1232                         hover_point_ = QPoint(-1, -1);
1233
1234                 update_hover_point();
1235
1236         } else if (type == QEvent::Leave) {
1237                 hover_point_ = QPoint(-1, -1);
1238                 update_hover_point();
1239         } else if (type == QEvent::Show) {
1240
1241                 // This is somewhat of a hack, unfortunately. We cannot use
1242                 // set_v_offset() from within restore_settings() as the view
1243                 // at that point is neither visible nor properly sized.
1244                 // This is the least intrusive workaround I could come up
1245                 // with: set the vertical offset (or scroll defaults) when
1246                 // the view is shown, which happens after all widgets were
1247                 // resized to their final sizes.
1248                 update_layout();
1249
1250                 if (settings_restored_)
1251                         determine_if_header_was_shrunk();
1252                 else
1253                         resize_header_to_fit();
1254
1255                 if (scroll_needs_defaults_) {
1256                         set_scroll_default();
1257                         scroll_needs_defaults_ = false;
1258                 }
1259
1260                 if (saved_v_offset_) {
1261                         set_v_offset(saved_v_offset_);
1262                         saved_v_offset_ = 0;
1263                 }
1264         }
1265
1266         return QObject::eventFilter(object, event);
1267 }
1268
1269 void View::resizeEvent(QResizeEvent* event)
1270 {
1271         // Only adjust the top margin if we shrunk vertically
1272         if (event->size().height() < event->oldSize().height())
1273                 adjust_top_margin();
1274
1275         update_layout();
1276 }
1277
1278 void View::update_hover_point()
1279 {
1280         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1281                 list_by_type<TraceTreeItem>());
1282         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1283                 r->hover_point_changed(hover_point_);
1284
1285         hover_point_changed(hover_point_);
1286 }
1287
1288 void View::row_item_appearance_changed(bool label, bool content)
1289 {
1290         if (label)
1291                 header_->update();
1292         if (content)
1293                 viewport_->update();
1294 }
1295
1296 void View::time_item_appearance_changed(bool label, bool content)
1297 {
1298         if (label) {
1299                 ruler_->update();
1300
1301                 // Make sure the header pane width is updated, too
1302                 update_layout();
1303         }
1304
1305         if (content)
1306                 viewport_->update();
1307 }
1308
1309 void View::extents_changed(bool horz, bool vert)
1310 {
1311         sticky_events_ |=
1312                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1313                 (vert ? TraceTreeItemVExtentsChanged : 0);
1314
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