pv/views/trace/view.cpp

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