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         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 202                 this, SLOT(h_scroll_value_changed(int)));
 203         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 204                 this, SLOT(v_scroll_value_changed()));
 205
 206         connect(header_, SIGNAL(selection_changed()),
 207                 ruler_, SLOT(clear_selection()));
 208         connect(ruler_, SIGNAL(selection_changed()),
 209                 header_, SLOT(clear_selection()));
 210
 211         connect(header_, SIGNAL(selection_changed()),
 212                 this, SIGNAL(selection_changed()));
 213         connect(ruler_, SIGNAL(selection_changed()),
 214                 this, SIGNAL(selection_changed()));
 215
 216         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 217                 this, SLOT(on_splitter_moved()));
 218
 219         connect(&lazy_event_handler_, SIGNAL(timeout()),
 220                 this, SLOT(process_sticky_events()));
 221         lazy_event_handler_.setSingleShot(true);
 222
 223         // Trigger the initial event manually. The default device has signals
 224         // which were created before this object came into being
 225         signals_changed();
 226
 227         // make sure the transparent widgets are on the top
 228         ruler_->raise();
 229         header_->raise();
 230
 231         // Update the zoom state
 232         calculate_tick_spacing();
 233
 234         // Make sure the standard bar's segment selector is in sync
 235         set_segment_display_mode(segment_display_mode_);
 236 }
 237
 238 Session& View::session()
 239 {
 240         return session_;
 241 }
 242
 243 const Session& View::session() const
 244 {
 245         return session_;
 246 }
 247
 248 unordered_set< shared_ptr<Signal> > View::signals() const
 249 {
 250         return signals_;
 251 }
 252
 253 void View::clear_signals()
 254 {
 255         ViewBase::clear_signalbases();
 256         signals_.clear();
 257 }
 258
 259 void View::add_signal(const shared_ptr<Signal> signal)
 260 {
 261         ViewBase::add_signalbase(signal->base());
 262         signals_.insert(signal);
 263
 264         signal->set_segment_display_mode(segment_display_mode_);
 265         signal->set_current_segment(current_segment_);
 266
 267         connect(signal->base().get(), SIGNAL(name_changed(const QString&)),
 268                 this, SLOT(on_signal_name_changed()));
 269 }
 270
 271 #ifdef ENABLE_DECODE
 272 void View::clear_decode_signals()
 273 {
 274         decode_traces_.clear();
 275 }
 276
 277 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 278 {
 279         shared_ptr<DecodeTrace> d(
 280                 new DecodeTrace(session_, signal, decode_traces_.size()));
 281         decode_traces_.push_back(d);
 282
 283         d->set_segment_display_mode(segment_display_mode_);
 284         d->set_current_segment(current_segment_);
 285
 286         connect(signal.get(), SIGNAL(name_changed(const QString&)),
 287                 this, SLOT(on_signal_name_changed()));
 288 }
 289
 290 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 291 {
 292         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 293                 if ((*i)->base() == signal) {
 294                         decode_traces_.erase(i);
 295                         signals_changed();
 296                         return;
 297                 }
 298 }
 299 #endif
 300
 301 View* View::view()
 302 {
 303         return this;
 304 }
 305
 306 const View* View::view() const
 307 {
 308         return this;
 309 }
 310
 311 Viewport* View::viewport()
 312 {
 313         return viewport_;
 314 }
 315
 316 const Viewport* View::viewport() const
 317 {
 318         return viewport_;
 319 }
 320
 321 void View::save_settings(QSettings &settings) const
 322 {
 323         settings.setValue("scale", scale_);
 324         settings.setValue("v_offset",
 325                 scrollarea_->verticalScrollBar()->sliderPosition());
 326
 327         settings.setValue("splitter_state", splitter_->saveState());
 328         settings.setValue("segment_display_mode", segment_display_mode_);
 329
 330         {
 331                 stringstream ss;
 332                 boost::archive::text_oarchive oa(ss);
 333                 oa << boost::serialization::make_nvp("ruler_shift", ruler_shift_);
 334                 settings.setValue("ruler_shift", QString::fromStdString(ss.str()));
 335         }
 336         {
 337                 stringstream ss;
 338                 boost::archive::text_oarchive oa(ss);
 339                 oa << boost::serialization::make_nvp("offset", offset_);
 340                 settings.setValue("offset", QString::fromStdString(ss.str()));
 341         }
 342
 343         for (shared_ptr<Signal> signal : signals_) {
 344                 settings.beginGroup(signal->base()->internal_name());
 345                 signal->save_settings(settings);
 346                 settings.endGroup();
 347         }
 348 }
 349
 350 void View::restore_settings(QSettings &settings)
 351 {
 352         // Note: It is assumed that this function is only called once,
 353         // immediately after restoring a previous session.
 354
 355         if (settings.contains("scale"))
 356                 set_scale(settings.value("scale").toDouble());
 357
 358         if (settings.contains("ruler_shift")) {
 359                 util::Timestamp shift;
 360                 stringstream ss;
 361                 ss << settings.value("ruler_shift").toString().toStdString();
 362
 363                 boost::archive::text_iarchive ia(ss);
 364                 ia >> boost::serialization::make_nvp("ruler_shift", shift);
 365
 366                 ruler_shift_ = shift;
 367         }
 368
 369         if (settings.contains("offset")) {
 370                 util::Timestamp offset;
 371                 stringstream ss;
 372                 ss << settings.value("offset").toString().toStdString();
 373
 374                 boost::archive::text_iarchive ia(ss);
 375                 ia >> boost::serialization::make_nvp("offset", offset);
 376
 377                 // This also updates ruler_offset_
 378                 set_offset(offset);
 379         }
 380
 381         if (settings.contains("splitter_state"))
 382                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 383
 384         if (settings.contains("segment_display_mode"))
 385                 set_segment_display_mode(
 386                         (Trace::SegmentDisplayMode)(settings.value("segment_display_mode").toInt()));
 387
 388         for (shared_ptr<Signal> signal : signals_) {
 389                 settings.beginGroup(signal->base()->internal_name());
 390                 signal->restore_settings(settings);
 391                 settings.endGroup();
 392         }
 393
 394         if (settings.contains("v_offset")) {
 395                 saved_v_offset_ = settings.value("v_offset").toInt();
 396                 set_v_offset(saved_v_offset_);
 397                 scroll_needs_defaults_ = false;
 398                 // Note: see eventFilter() for additional information
 399         }
 400
 401         settings_restored_ = true;
 402         suppress_zoom_to_fit_after_acq_ = true;
 403
 404         // Update the ruler so that it uses the new scale
 405         calculate_tick_spacing();
 406 }
 407
 408 vector< shared_ptr<TimeItem> > View::time_items() const
 409 {
 410         const vector<shared_ptr<Flag>> f(flags());
 411         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 412         items.push_back(cursors_);
 413         items.push_back(cursors_->first());
 414         items.push_back(cursors_->second());
 415
 416         for (auto trigger_marker : trigger_markers_)
 417                 items.push_back(trigger_marker);
 418
 419         return items;
 420 }
 421
 422 double View::scale() const
 423 {
 424         return scale_;
 425 }
 426
 427 void View::set_scale(double scale)
 428 {
 429         if (scale_ != scale) {
 430                 scale_ = scale;
 431                 scale_changed();
 432         }
 433 }
 434
 435 void View::set_offset(const pv::util::Timestamp& offset)
 436 {
 437         if (offset_ != offset) {
 438                 offset_ = offset;
 439                 ruler_offset_ = offset_ + ruler_shift_;
 440                 offset_changed();
 441         }
 442 }
 443
 444 // Returns the internal version of the time offset
 445 const Timestamp& View::offset() const
 446 {
 447         return offset_;
 448 }
 449
 450 // Returns the ruler version of the time offset
 451 const Timestamp& View::ruler_offset() const
 452 {
 453         return ruler_offset_;
 454 }
 455
 456 int View::owner_visual_v_offset() const
 457 {
 458         return -scrollarea_->verticalScrollBar()->sliderPosition();
 459 }
 460
 461 void View::set_v_offset(int offset)
 462 {
 463         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 464         header_->update();
 465         viewport_->update();
 466 }
 467
 468 unsigned int View::depth() const
 469 {
 470         return 0;
 471 }
 472
 473 uint32_t View::current_segment() const
 474 {
 475         return current_segment_;
 476 }
 477
 478 pv::util::SIPrefix View::tick_prefix() const
 479 {
 480         return tick_prefix_;
 481 }
 482
 483 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 484 {
 485         if (tick_prefix_ != tick_prefix) {
 486                 tick_prefix_ = tick_prefix;
 487                 tick_prefix_changed();
 488         }
 489 }
 490
 491 unsigned int View::tick_precision() const
 492 {
 493         return tick_precision_;
 494 }
 495
 496 void View::set_tick_precision(unsigned tick_precision)
 497 {
 498         if (tick_precision_ != tick_precision) {
 499                 tick_precision_ = tick_precision;
 500                 tick_precision_changed();
 501         }
 502 }
 503
 504 const pv::util::Timestamp& View::tick_period() const
 505 {
 506         return tick_period_;
 507 }
 508
 509 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 510 {
 511         if (tick_period_ != tick_period) {
 512                 tick_period_ = tick_period;
 513                 tick_period_changed();
 514         }
 515 }
 516
 517 TimeUnit View::time_unit() const
 518 {
 519         return time_unit_;
 520 }
 521
 522 void View::set_time_unit(pv::util::TimeUnit time_unit)
 523 {
 524         if (time_unit_ != time_unit) {
 525                 time_unit_ = time_unit;
 526                 time_unit_changed();
 527         }
 528 }
 529
 530 void View::set_current_segment(uint32_t segment_id)
 531 {
 532         current_segment_ = segment_id;
 533
 534         for (shared_ptr<Signal> signal : signals_)
 535                 signal->set_current_segment(current_segment_);
 536         for (shared_ptr<DecodeTrace> dt : decode_traces_)
 537                 dt->set_current_segment(current_segment_);
 538
 539         viewport_->update();
 540
 541         segment_changed(segment_id);
 542 }
 543
 544 bool View::segment_is_selectable() const
 545 {
 546         return segment_selectable_;
 547 }
 548
 549 Trace::SegmentDisplayMode View::segment_display_mode() const
 550 {
 551         return segment_display_mode_;
 552 }
 553
 554 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 555 {
 556         segment_display_mode_ = mode;
 557
 558         for (shared_ptr<Signal> signal : signals_)
 559                 signal->set_segment_display_mode(mode);
 560
 561         uint32_t last_segment = session_.get_segment_count() - 1;
 562
 563         switch (mode) {
 564         case Trace::ShowLastSegmentOnly:
 565                 if (current_segment_ != last_segment)
 566                         set_current_segment(last_segment);
 567                 break;
 568
 569         case Trace::ShowLastCompleteSegmentOnly:
 570                 // Do nothing if we only have one segment so far
 571                 if (last_segment > 0) {
 572                         // If the last segment isn't complete, the previous one must be
 573                         uint32_t segment_id =
 574                                 (session_.all_segments_complete(last_segment)) ?
 575                                 last_segment : last_segment - 1;
 576
 577                         if (current_segment_ != segment_id)
 578                                 set_current_segment(segment_id);
 579                 }
 580                 break;
 581
 582         case Trace::ShowSingleSegmentOnly:
 583         case Trace::ShowAllSegments:
 584         case Trace::ShowAccumulatedIntensity:
 585         default:
 586                 // Current segment remains as-is
 587                 break;
 588         }
 589
 590         segment_selectable_ = true;
 591
 592         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 593                 segment_selectable_ = false;
 594
 595         viewport_->update();
 596
 597         segment_display_mode_changed((int)mode, segment_selectable_);
 598 }
 599
 600 void View::zoom(double steps)
 601 {
 602         zoom(steps, viewport_->width() / 2);
 603 }
 604
 605 void View::zoom(double steps, int offset)
 606 {
 607         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 608 }
 609
 610 void View::zoom_fit(bool gui_state)
 611 {
 612         // Act as one-shot when stopped, toggle along with the GUI otherwise
 613         if (session_.get_capture_state() == Session::Stopped) {
 614                 always_zoom_to_fit_ = false;
 615                 always_zoom_to_fit_changed(false);
 616         } else {
 617                 always_zoom_to_fit_ = gui_state;
 618                 always_zoom_to_fit_changed(gui_state);
 619         }
 620
 621         const pair<Timestamp, Timestamp> extents = get_time_extents();
 622         const Timestamp delta = extents.second - extents.first;
 623         if (delta < Timestamp("1e-12"))
 624                 return;
 625
 626         assert(viewport_);
 627         const int w = viewport_->width();
 628         if (w <= 0)
 629                 return;
 630
 631         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 632         set_scale_offset(scale.convert_to<double>(), extents.first);
 633 }
 634
 635 void View::zoom_one_to_one()
 636 {
 637         using pv::data::SignalData;
 638
 639         // Make a set of all the visible data objects
 640         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 641         if (visible_data.empty())
 642                 return;
 643
 644         assert(viewport_);
 645         const int w = viewport_->width();
 646         if (w <= 0)
 647                 return;
 648
 649         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 650 }
 651
 652 void View::set_scale_offset(double scale, const Timestamp& offset)
 653 {
 654         // Disable sticky scrolling / always zoom to fit when acquisition runs
 655         // and user drags the viewport
 656         if ((scale_ == scale) && (offset_ != offset) &&
 657                         (session_.get_capture_state() == Session::Running)) {
 658
 659                 if (sticky_scrolling_) {
 660                         sticky_scrolling_ = false;
 661                         sticky_scrolling_changed(false);
 662                 }
 663
 664                 if (always_zoom_to_fit_) {
 665                         always_zoom_to_fit_ = false;
 666                         always_zoom_to_fit_changed(false);
 667                 }
 668         }
 669
 670         set_scale(scale);
 671         set_offset(offset);
 672
 673         calculate_tick_spacing();
 674
 675         update_scroll();
 676         ruler_->update();
 677         viewport_->update();
 678 }
 679
 680 set< shared_ptr<SignalData> > View::get_visible_data() const
 681 {
 682         // Make a set of all the visible data objects
 683         set< shared_ptr<SignalData> > visible_data;
 684         for (const shared_ptr<Signal> sig : signals_)
 685                 if (sig->enabled())
 686                         visible_data.insert(sig->data());
 687
 688         return visible_data;
 689 }
 690
 691 pair<Timestamp, Timestamp> View::get_time_extents() const
 692 {
 693         boost::optional<Timestamp> left_time, right_time;
 694         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 695         for (const shared_ptr<SignalData> d : visible_data) {
 696                 const vector< shared_ptr<Segment> > segments = d->segments();
 697                 for (const shared_ptr<Segment> &s : segments) {
 698                         double samplerate = s->samplerate();
 699                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 700
 701                         const Timestamp start_time = s->start_time();
 702                         left_time = left_time ?
 703                                 min(*left_time, start_time) :
 704                                                 start_time;
 705                         right_time = right_time ?
 706                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 707                                                  start_time + d->max_sample_count() / samplerate;
 708                 }
 709         }
 710
 711         if (!left_time || !right_time)
 712                 return make_pair(0, 0);
 713
 714         assert(*left_time < *right_time);
 715         return make_pair(*left_time, *right_time);
 716 }
 717
 718 void View::enable_show_sampling_points(bool state)
 719 {
 720         (void)state;
 721
 722         viewport_->update();
 723 }
 724
 725 void View::enable_show_analog_minor_grid(bool state)
 726 {
 727         (void)state;
 728
 729         viewport_->update();
 730 }
 731
 732 void View::enable_coloured_bg(bool state)
 733 {
 734         coloured_bg_ = state;
 735         viewport_->update();
 736 }
 737
 738 bool View::coloured_bg() const
 739 {
 740         return coloured_bg_;
 741 }
 742
 743 bool View::cursors_shown() const
 744 {
 745         return show_cursors_;
 746 }
 747
 748 void View::show_cursors(bool show)
 749 {
 750         show_cursors_ = show;
 751         ruler_->update();
 752         viewport_->update();
 753 }
 754
 755 void View::centre_cursors()
 756 {
 757         const double time_width = scale_ * viewport_->width();
 758         cursors_->first()->set_time(offset_ + time_width * 0.4);
 759         cursors_->second()->set_time(offset_ + time_width * 0.6);
 760         ruler_->update();
 761         viewport_->update();
 762 }
 763
 764 shared_ptr<CursorPair> View::cursors() const
 765 {
 766         return cursors_;
 767 }
 768
 769 void View::add_flag(const Timestamp& time)
 770 {
 771         flags_.push_back(make_shared<Flag>(*this, time,
 772                 QString("%1").arg(next_flag_text_)));
 773
 774         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 775                 (next_flag_text_ + 1);
 776
 777         time_item_appearance_changed(true, true);
 778 }
 779
 780 void View::remove_flag(shared_ptr<Flag> flag)
 781 {
 782         flags_.remove(flag);
 783         time_item_appearance_changed(true, true);
 784 }
 785
 786 vector< shared_ptr<Flag> > View::flags() const
 787 {
 788         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 789         stable_sort(flags.begin(), flags.end(),
 790                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 791                         return a->time() < b->time();
 792                 });
 793
 794         return flags;
 795 }
 796
 797 const QPoint& View::hover_point() const
 798 {
 799         return hover_point_;
 800 }
 801
 802 void View::restack_all_trace_tree_items()
 803 {
 804         // Make a list of owners that is sorted from deepest first
 805         const vector<shared_ptr<TraceTreeItem>> items(
 806                 list_by_type<TraceTreeItem>());
 807         set< TraceTreeItemOwner* > owners;
 808         for (const auto &r : items)
 809                 owners.insert(r->owner());
 810         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 811         sort(sorted_owners.begin(), sorted_owners.end(),
 812                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 813                         return a->depth() > b->depth(); });
 814
 815         // Restack the items recursively
 816         for (auto &o : sorted_owners)
 817                 o->restack_items();
 818
 819         // Animate the items to their destination
 820         for (const auto &i : items)
 821                 i->animate_to_layout_v_offset();
 822 }
 823
 824 void View::trigger_event(util::Timestamp location)
 825 {
 826         // Set up ruler_shift if the Key_View_TriggerIsZeroTime option is set.
 827         GlobalSettings settings;
 828         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 829
 830         ruler_shift_ = (trigger_is_zero_time) ? (-location) : (0);
 831         // Force an immediate update of both offsets
 832         offset_ -= 0.001;
 833         set_offset(offset_ + 0.001);
 834
 835         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 836 }
 837
 838 void View::get_scroll_layout(double &length, Timestamp &offset) const
 839 {
 840         const pair<Timestamp, Timestamp> extents = get_time_extents();
 841         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 842         offset = offset_ / scale_;
 843 }
 844
 845 void View::set_zoom(double scale, int offset)
 846 {
 847         // Reset the "always zoom to fit" feature as the user changed the zoom
 848         always_zoom_to_fit_ = false;
 849         always_zoom_to_fit_changed(false);
 850
 851         const Timestamp cursor_offset = offset_ + scale_ * offset;
 852         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 853         const Timestamp new_offset = cursor_offset - new_scale * offset;
 854         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 855 }
 856
 857 void View::calculate_tick_spacing()
 858 {
 859         const double SpacingIncrement = 10.0f;
 860         const double MinValueSpacing = 40.0f;
 861
 862         // Figure out the highest numeric value visible on a label
 863         const QSize areaSize = viewport_->size();
 864         const Timestamp max_time = max(fabs(offset_),
 865                 fabs(offset_ + scale_ * areaSize.width()));
 866
 867         double min_width = SpacingIncrement;
 868         double label_width, tick_period_width;
 869
 870         QFontMetrics m(QApplication::font());
 871
 872         // Copies of the member variables with the same name, used in the calculation
 873         // and written back afterwards, so that we don't emit signals all the time
 874         // during the calculation.
 875         pv::util::Timestamp tick_period = tick_period_;
 876         pv::util::SIPrefix tick_prefix = tick_prefix_;
 877         unsigned tick_precision = tick_precision_;
 878
 879         do {
 880                 const double min_period = scale_ * min_width;
 881
 882                 const int order = (int)floorf(log10f(min_period));
 883                 const pv::util::Timestamp order_decimal =
 884                         pow(pv::util::Timestamp(10), order);
 885
 886                 // Allow for a margin of error so that a scale unit of 1 can be used.
 887                 // Otherwise, for a SU of 1 the tick period will almost always be below
 888                 // the min_period by a small amount - and thus skipped in favor of 2.
 889                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 890                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 891                 double tp_with_margin;
 892                 unsigned int unit = 0;
 893
 894                 do {
 895                         tp_with_margin = order_decimal.convert_to<double>() *
 896                                 (ScaleUnits[unit++] + tp_margin);
 897                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 898
 899                 tick_period = order_decimal * ScaleUnits[unit - 1];
 900                 tick_prefix = static_cast<pv::util::SIPrefix>(
 901                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 902
 903                 // Precision is the number of fractional digits required, not
 904                 // taking the prefix into account (and it must never be negative)
 905                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 906
 907                 tick_period_width = (tick_period / scale_).convert_to<double>();
 908
 909                 const QString label_text = Ruler::format_time_with_distance(
 910                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 911
 912                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 913                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 914                                 MinValueSpacing;
 915
 916                 min_width += SpacingIncrement;
 917         } while (tick_period_width < label_width);
 918
 919         set_tick_period(tick_period);
 920         set_tick_prefix(tick_prefix);
 921         set_tick_precision(tick_precision);
 922 }
 923
 924 void View::adjust_top_margin()
 925 {
 926         assert(viewport_);
 927
 928         const QSize areaSize = viewport_->size();
 929
 930         const pair<int, int> extents = v_extents();
 931         const int top_margin = owner_visual_v_offset() + extents.first;
 932         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
 933
 934         // Do we have empty space at the top while the last trace goes out of screen?
 935         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
 936                 const int trace_height = extents.second - extents.first;
 937
 938                 // Center everything vertically if there is enough space
 939                 if (areaSize.height() >= trace_height)
 940                         set_v_offset(extents.first -
 941                                 ((areaSize.height() - trace_height) / 2));
 942                 else
 943                         // Remove the top margin to make as many traces fit on screen as possible
 944                         set_v_offset(extents.first);
 945         }
 946 }
 947
 948 void View::update_scroll()
 949 {
 950         assert(viewport_);
 951         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
 952         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
 953
 954         const QSize areaSize = viewport_->size();
 955
 956         // Set the horizontal scroll bar
 957         double length = 0;
 958         Timestamp offset;
 959         get_scroll_layout(length, offset);
 960         length = max(length - areaSize.width(), 0.0);
 961
 962         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
 963
 964         hscrollbar->setPageStep(areaSize.width() / 2);
 965         hscrollbar->setSingleStep(major_tick_distance);
 966
 967         updating_scroll_ = true;
 968
 969         if (length < MaxScrollValue) {
 970                 hscrollbar->setRange(0, length);
 971                 hscrollbar->setSliderPosition(offset.convert_to<double>());
 972         } else {
 973                 hscrollbar->setRange(0, MaxScrollValue);
 974                 hscrollbar->setSliderPosition(
 975                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
 976         }
 977
 978         updating_scroll_ = false;
 979
 980         // Set the vertical scrollbar
 981         vscrollbar->setPageStep(areaSize.height());
 982         vscrollbar->setSingleStep(areaSize.height() / 8);
 983
 984         const pair<int, int> extents = v_extents();
 985
 986         // Don't change the scrollbar range if there are no traces
 987         if (extents.first != extents.second)
 988                 vscrollbar->setRange(extents.first - areaSize.height(),
 989                         extents.second);
 990
 991         if (scroll_needs_defaults_)
 992                 set_scroll_default();
 993 }
 994
 995 void View::reset_scroll()
 996 {
 997         scrollarea_->verticalScrollBar()->setRange(0, 0);
 998 }
 999
1000 void View::set_scroll_default()
1001 {
1002         assert(viewport_);
1003
1004         const QSize areaSize = viewport_->size();
1005
1006         const pair<int, int> extents = v_extents();
1007         const int trace_height = extents.second - extents.first;
1008
1009         // Do all traces fit in the view?
1010         if (areaSize.height() >= trace_height)
1011                 // Center all traces vertically
1012                 set_v_offset(extents.first -
1013                         ((areaSize.height() - trace_height) / 2));
1014         else
1015                 // Put the first trace at the top, letting the bottom ones overflow
1016                 set_v_offset(extents.first);
1017 }
1018
1019 void View::determine_if_header_was_shrunk()
1020 {
1021         const int header_pane_width = splitter_->sizes().front();
1022         const int header_width = header_->extended_size_hint().width();
1023
1024         // Allow for a slight margin of error so that we also accept
1025         // slight differences when e.g. a label name change increased
1026         // the overall width
1027         header_was_shrunk_ = (header_pane_width < (header_width - 10));
1028 }
1029
1030 void View::resize_header_to_fit()
1031 {
1032         // Setting the maximum width of the header widget doesn't work as
1033         // expected because the splitter would allow the user to make the
1034         // pane wider than that, creating empty space as a result.
1035         // To make this work, we stricly enforce the maximum width by
1036         // expanding the header unless the user shrunk it on purpose.
1037         // As we're then setting the width of the header pane, we set the
1038         // splitter to the maximum allowed position.
1039
1040         int splitter_area_width = 0;
1041         for (int w : splitter_->sizes())
1042                 splitter_area_width += w;
1043
1044         // Make sure the header has enough horizontal space to show all labels fully
1045         QList<int> pane_sizes;
1046         pane_sizes.push_back(header_->extended_size_hint().width());
1047         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1048         splitter_->setSizes(pane_sizes);
1049 }
1050
1051 void View::update_layout()
1052 {
1053         update_scroll();
1054 }
1055
1056 TraceTreeItemOwner* View::find_prevalent_trace_group(
1057         const shared_ptr<sigrok::ChannelGroup> &group,
1058         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1059                 &signal_map)
1060 {
1061         assert(group);
1062
1063         unordered_set<TraceTreeItemOwner*> owners;
1064         vector<TraceTreeItemOwner*> owner_list;
1065
1066         // Make a set and a list of all the owners
1067         for (const auto &channel : group->channels()) {
1068                 for (auto entry : signal_map) {
1069                         if (entry.first->channel() == channel) {
1070                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1071                                 owner_list.push_back(o);
1072                                 owners.insert(o);
1073                         }
1074                 }
1075         }
1076
1077         // Iterate through the list of owners, and find the most prevalent
1078         size_t max_prevalence = 0;
1079         TraceTreeItemOwner *prevalent_owner = nullptr;
1080         for (TraceTreeItemOwner *owner : owners) {
1081                 const size_t prevalence = count_if(
1082                         owner_list.begin(), owner_list.end(),
1083                         [&](TraceTreeItemOwner *o) { return o == owner; });
1084                 if (prevalence > max_prevalence) {
1085                         max_prevalence = prevalence;
1086                         prevalent_owner = owner;
1087                 }
1088         }
1089
1090         return prevalent_owner;
1091 }
1092
1093 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1094         const vector< shared_ptr<sigrok::Channel> > &channels,
1095         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1096                 &signal_map,
1097         set< shared_ptr<Trace> > &add_list)
1098 {
1099         vector< shared_ptr<Trace> > filtered_traces;
1100
1101         for (const auto &channel : channels) {
1102                 for (auto entry : signal_map) {
1103                         if (entry.first->channel() == channel) {
1104                                 shared_ptr<Trace> trace = entry.second;
1105                                 const auto list_iter = add_list.find(trace);
1106                                 if (list_iter == add_list.end())
1107                                         continue;
1108
1109                                 filtered_traces.push_back(trace);
1110                                 add_list.erase(list_iter);
1111                         }
1112                 }
1113         }
1114
1115         return filtered_traces;
1116 }
1117
1118 void View::determine_time_unit()
1119 {
1120         // Check whether we know the sample rate and hence can use time as the unit
1121         if (time_unit_ == util::TimeUnit::Samples) {
1122                 // Check all signals but...
1123                 for (const shared_ptr<Signal> signal : signals_) {
1124                         const shared_ptr<SignalData> data = signal->data();
1125
1126                         // ...only check first segment of each
1127                         const vector< shared_ptr<Segment> > segments = data->segments();
1128                         if (!segments.empty())
1129                                 if (segments[0]->samplerate()) {
1130                                         set_time_unit(util::TimeUnit::Time);
1131                                         break;
1132                                 }
1133                 }
1134         }
1135 }
1136
1137 bool View::eventFilter(QObject *object, QEvent *event)
1138 {
1139         const QEvent::Type type = event->type();
1140         if (type == QEvent::MouseMove) {
1141
1142                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1143                 if (object == viewport_)
1144                         hover_point_ = mouse_event->pos();
1145                 else if (object == ruler_)
1146                         hover_point_ = QPoint(mouse_event->x(), 0);
1147                 else if (object == header_)
1148                         hover_point_ = QPoint(0, mouse_event->y());
1149                 else
1150                         hover_point_ = QPoint(-1, -1);
1151
1152                 update_hover_point();
1153
1154         } else if (type == QEvent::Leave) {
1155                 hover_point_ = QPoint(-1, -1);
1156                 update_hover_point();
1157         } else if (type == QEvent::Show) {
1158
1159                 // This is somewhat of a hack, unfortunately. We cannot use
1160                 // set_v_offset() from within restore_settings() as the view
1161                 // at that point is neither visible nor properly sized.
1162                 // This is the least intrusive workaround I could come up
1163                 // with: set the vertical offset (or scroll defaults) when
1164                 // the view is shown, which happens after all widgets were
1165                 // resized to their final sizes.
1166                 update_layout();
1167
1168                 if (settings_restored_)
1169                         determine_if_header_was_shrunk();
1170                 else
1171                         resize_header_to_fit();
1172
1173                 if (scroll_needs_defaults_) {
1174                         set_scroll_default();
1175                         scroll_needs_defaults_ = false;
1176                 }
1177
1178                 if (saved_v_offset_) {
1179                         set_v_offset(saved_v_offset_);
1180                         saved_v_offset_ = 0;
1181                 }
1182         }
1183
1184         return QObject::eventFilter(object, event);
1185 }
1186
1187 void View::resizeEvent(QResizeEvent* event)
1188 {
1189         // Only adjust the top margin if we shrunk vertically
1190         if (event->size().height() < event->oldSize().height())
1191                 adjust_top_margin();
1192
1193         update_layout();
1194 }
1195
1196 void View::update_hover_point()
1197 {
1198         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1199                 list_by_type<TraceTreeItem>());
1200         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1201                 r->hover_point_changed(hover_point_);
1202
1203         hover_point_changed(hover_point_);
1204 }
1205
1206 void View::row_item_appearance_changed(bool label, bool content)
1207 {
1208         if (label)
1209                 header_->update();
1210         if (content)
1211                 viewport_->update();
1212 }
1213
1214 void View::time_item_appearance_changed(bool label, bool content)
1215 {
1216         if (label) {
1217                 ruler_->update();
1218
1219                 // Make sure the header pane width is updated, too
1220                 update_layout();
1221         }
1222
1223         if (content)
1224                 viewport_->update();
1225 }
1226
1227 void View::extents_changed(bool horz, bool vert)
1228 {
1229         sticky_events_ |=
1230                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1231                 (vert ? TraceTreeItemVExtentsChanged : 0);
1232
1233         lazy_event_handler_.start();
1234 }
1235
1236 void View::on_signal_name_changed()
1237 {
1238         if (!header_was_shrunk_)
1239                 resize_header_to_fit();
1240 }
1241
1242 void View::on_splitter_moved()
1243 {
1244         // The header can only shrink when the splitter is moved manually
1245         determine_if_header_was_shrunk();
1246
1247         if (!header_was_shrunk_)
1248                 resize_header_to_fit();
1249 }
1250
1251 void View::h_scroll_value_changed(int value)
1252 {
1253         if (updating_scroll_)
1254                 return;
1255
1256         // Disable sticky scrolling when user moves the horizontal scroll bar
1257         // during a running acquisition
1258         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1259                 sticky_scrolling_ = false;
1260                 sticky_scrolling_changed(false);
1261         }
1262
1263         const int range = scrollarea_->horizontalScrollBar()->maximum();
1264         if (range < MaxScrollValue)
1265                 set_offset(scale_ * value);
1266         else {
1267                 double length = 0;
1268                 Timestamp offset;
1269                 get_scroll_layout(length, offset);
1270                 set_offset(scale_ * length * value / MaxScrollValue);
1271         }
1272
1273         ruler_->update();
1274         viewport_->update();
1275 }
1276
1277 void View::v_scroll_value_changed()
1278 {
1279         header_->update();
1280         viewport_->update();
1281 }
1282
1283 void View::signals_changed()
1284 {
1285         using sigrok::Channel;
1286
1287         vector< shared_ptr<Channel> > channels;
1288         shared_ptr<sigrok::Device> sr_dev;
1289         bool signals_added_or_removed = false;
1290
1291         // Do we need to set the vertical scrollbar to its default position later?
1292         // We do if there are no traces, i.e. the scroll bar has no range set
1293         bool reset_scrollbar =
1294                 (scrollarea_->verticalScrollBar()->minimum() ==
1295                         scrollarea_->verticalScrollBar()->maximum());
1296
1297         if (!session_.device()) {
1298                 reset_scroll();
1299                 signals_.clear();
1300         } else {
1301                 sr_dev = session_.device()->device();
1302                 assert(sr_dev);
1303                 channels = sr_dev->channels();
1304         }
1305
1306         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1307
1308         // Make a list of traces that are being added, and a list of traces
1309         // that are being removed
1310         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1311         const set<shared_ptr<Trace>> prev_traces(
1312                 prev_trace_list.begin(), prev_trace_list.end());
1313
1314         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1315
1316 #ifdef ENABLE_DECODE
1317         traces.insert(decode_traces_.begin(), decode_traces_.end());
1318 #endif
1319
1320         set< shared_ptr<Trace> > add_traces;
1321         set_difference(traces.begin(), traces.end(),
1322                 prev_traces.begin(), prev_traces.end(),
1323                 inserter(add_traces, add_traces.begin()));
1324
1325         set< shared_ptr<Trace> > remove_traces;
1326         set_difference(prev_traces.begin(), prev_traces.end(),
1327                 traces.begin(), traces.end(),
1328                 inserter(remove_traces, remove_traces.begin()));
1329
1330         // Make a look-up table of sigrok Channels to pulseview Signals
1331         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1332                 signal_map;
1333         for (const shared_ptr<Signal> &sig : signals_)
1334                 signal_map[sig->base()] = sig;
1335
1336         // Populate channel groups
1337         if (sr_dev)
1338                 for (auto entry : sr_dev->channel_groups()) {
1339                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1340
1341                         if (group->channels().size() <= 1)
1342                                 continue;
1343
1344                         // Find best trace group to add to
1345                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1346                                 group, signal_map);
1347
1348                         // If there is no trace group, create one
1349                         shared_ptr<TraceGroup> new_trace_group;
1350                         if (!owner) {
1351                                 new_trace_group.reset(new TraceGroup());
1352                                 owner = new_trace_group.get();
1353                         }
1354
1355                         // Extract traces for the trace group, removing them from
1356                         // the add list
1357                         const vector< shared_ptr<Trace> > new_traces_in_group =
1358                                 extract_new_traces_for_channels(group->channels(),
1359                                         signal_map, add_traces);
1360
1361                         // Add the traces to the group
1362                         const pair<int, int> prev_v_extents = owner->v_extents();
1363                         int offset = prev_v_extents.second - prev_v_extents.first;
1364                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1365                                 assert(trace);
1366                                 owner->add_child_item(trace);
1367
1368                                 const pair<int, int> extents = trace->v_extents();
1369                                 if (trace->enabled())
1370                                         offset += -extents.first;
1371                                 trace->force_to_v_offset(offset);
1372                                 if (trace->enabled())
1373                                         offset += extents.second;
1374                         }
1375
1376                         if (new_trace_group) {
1377                                 // Assign proper vertical offsets to each channel in the group
1378                                 new_trace_group->restack_items();
1379
1380                                 // If this is a new group, enqueue it in the new top level
1381                                 // items list
1382                                 if (!new_traces_in_group.empty())
1383                                         new_top_level_items.push_back(new_trace_group);
1384                         }
1385                 }
1386
1387         // Enqueue the remaining logic channels in a group
1388         vector< shared_ptr<Channel> > logic_channels;
1389         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1390                 [](const shared_ptr<Channel>& c) {
1391                         return c->type() == sigrok::ChannelType::LOGIC; });
1392
1393         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1394                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1395
1396         if (non_grouped_logic_signals.size() > 0) {
1397                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1398                         make_shared<TraceGroup>());
1399                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1400                         non_grouped_trace_group->add_child_item(trace);
1401
1402                 non_grouped_trace_group->restack_items();
1403                 new_top_level_items.push_back(non_grouped_trace_group);
1404         }
1405
1406         // Enqueue the remaining channels as free ungrouped traces
1407         const vector< shared_ptr<Trace> > new_top_level_signals =
1408                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1409         new_top_level_items.insert(new_top_level_items.end(),
1410                 new_top_level_signals.begin(), new_top_level_signals.end());
1411
1412         // Enqueue any remaining traces i.e. decode traces
1413         new_top_level_items.insert(new_top_level_items.end(),
1414                 add_traces.begin(), add_traces.end());
1415
1416         // Remove any removed traces
1417         for (shared_ptr<Trace> trace : remove_traces) {
1418                 TraceTreeItemOwner *const owner = trace->owner();
1419                 assert(owner);
1420                 owner->remove_child_item(trace);
1421                 signals_added_or_removed = true;
1422         }
1423
1424         // Remove any empty trace groups
1425         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1426                 if (group->child_items().size() == 0) {
1427                         remove_child_item(group);
1428                         group.reset();
1429                 }
1430
1431         // Add and position the pending top levels items
1432         int offset = v_extents().second;
1433         for (auto item : new_top_level_items) {
1434                 add_child_item(item);
1435
1436                 // Position the item after the last item or at the top if there is none
1437                 const pair<int, int> extents = item->v_extents();
1438
1439                 if (item->enabled())
1440                         offset += -extents.first;
1441
1442                 item->force_to_v_offset(offset);
1443
1444                 if (item->enabled())
1445                         offset += extents.second;
1446                 signals_added_or_removed = true;
1447         }
1448
1449
1450         if (signals_added_or_removed && !header_was_shrunk_)
1451                 resize_header_to_fit();
1452
1453         update_layout();
1454
1455         header_->update();
1456         viewport_->update();
1457
1458         if (reset_scrollbar)
1459                 set_scroll_default();
1460 }
1461
1462 void View::capture_state_updated(int state)
1463 {
1464         GlobalSettings settings;
1465
1466         if (state == Session::Running) {
1467                 set_time_unit(util::TimeUnit::Samples);
1468
1469                 trigger_markers_.clear();
1470
1471                 scale_at_acq_start_ = scale_;
1472                 offset_at_acq_start_ = offset_;
1473
1474                 // Activate "always zoom to fit" if the setting is enabled and we're
1475                 // the main view of this session (other trace views may be used for
1476                 // zooming and we don't want to mess them up)
1477                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1478                 if (is_main_view_ && state) {
1479                         always_zoom_to_fit_ = true;
1480                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1481                 }
1482
1483                 // Enable sticky scrolling if the setting is enabled
1484                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1485
1486                 // Reset all traces to segment 0
1487                 current_segment_ = 0;
1488                 set_current_segment(current_segment_);
1489         }
1490
1491         if (state == Session::Stopped) {
1492                 // After acquisition has stopped we need to re-calculate the ticks once
1493                 // as it's otherwise done when the user pans or zooms, which is too late
1494                 calculate_tick_spacing();
1495
1496                 // Reset "always zoom to fit", the acquisition has stopped
1497                 if (always_zoom_to_fit_) {
1498                         // Perform a final zoom-to-fit before disabling
1499                         zoom_fit(always_zoom_to_fit_);
1500                         always_zoom_to_fit_ = false;
1501                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1502                 }
1503
1504                 bool zoom_to_fit_after_acq =
1505                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1506
1507                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1508                 // we didn't restore settings in the meanwhile
1509                 if (zoom_to_fit_after_acq &&
1510                         !suppress_zoom_to_fit_after_acq_ &&
1511                         (scale_ == scale_at_acq_start_) &&
1512                         (offset_ == offset_at_acq_start_))
1513                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1514
1515                 suppress_zoom_to_fit_after_acq_ = false;
1516         }
1517 }
1518
1519 void View::on_new_segment(int new_segment_id)
1520 {
1521         on_segment_changed(new_segment_id);
1522 }
1523
1524 void View::on_segment_completed(int segment_id)
1525 {
1526         on_segment_changed(segment_id);
1527 }
1528
1529 void View::on_segment_changed(int segment)
1530 {
1531         switch (segment_display_mode_) {
1532         case Trace::ShowLastSegmentOnly:
1533         case Trace::ShowSingleSegmentOnly:
1534                 set_current_segment(segment);
1535                 break;
1536
1537         case Trace::ShowLastCompleteSegmentOnly:
1538                 // Only update if all segments are complete
1539                 if (session_.all_segments_complete(segment))
1540                         set_current_segment(segment);
1541                 break;
1542
1543         case Trace::ShowAllSegments:
1544         case Trace::ShowAccumulatedIntensity:
1545         default:
1546                 break;
1547         }
1548 }
1549
1550 void View::perform_delayed_view_update()
1551 {
1552         if (always_zoom_to_fit_) {
1553                 zoom_fit(true);
1554         } else if (sticky_scrolling_) {
1555                 // Make right side of the view sticky
1556                 double length = 0;
1557                 Timestamp offset;
1558                 get_scroll_layout(length, offset);
1559
1560                 const QSize areaSize = viewport_->size();
1561                 length = max(length - areaSize.width(), 0.0);
1562
1563                 set_offset(scale_ * length);
1564         }
1565
1566         determine_time_unit();
1567         update_scroll();
1568         ruler_->update();
1569         viewport_->update();
1570 }
1571
1572 void View::process_sticky_events()
1573 {
1574         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1575                 update_layout();
1576         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1577                 restack_all_trace_tree_items();
1578                 update_scroll();
1579         }
1580
1581         // Clear the sticky events
1582         sticky_events_ = 0;
1583 }
1584
1585 } // namespace trace
1586 } // namespace views
1587 } // namespace pv