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 unsigned int View::minor_tick_count() const
 510 {
 511         return minor_tick_count_;
 512 }
 513
 514 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 515 {
 516         if (tick_period_ != tick_period) {
 517                 tick_period_ = tick_period;
 518                 tick_period_changed();
 519         }
 520 }
 521
 522 TimeUnit View::time_unit() const
 523 {
 524         return time_unit_;
 525 }
 526
 527 void View::set_time_unit(pv::util::TimeUnit time_unit)
 528 {
 529         if (time_unit_ != time_unit) {
 530                 time_unit_ = time_unit;
 531                 time_unit_changed();
 532         }
 533 }
 534
 535 void View::set_current_segment(uint32_t segment_id)
 536 {
 537         current_segment_ = segment_id;
 538
 539         for (shared_ptr<Signal> signal : signals_)
 540                 signal->set_current_segment(current_segment_);
 541         for (shared_ptr<DecodeTrace> dt : decode_traces_)
 542                 dt->set_current_segment(current_segment_);
 543
 544         trigger_markers_.clear();
 545         for (util::Timestamp timestamp : session_.get_triggers(segment_id))
 546                 trigger_markers_.push_back(make_shared<TriggerMarker>(*this, timestamp));
 547
 548         viewport_->update();
 549
 550         segment_changed(segment_id);
 551 }
 552
 553 bool View::segment_is_selectable() const
 554 {
 555         return segment_selectable_;
 556 }
 557
 558 Trace::SegmentDisplayMode View::segment_display_mode() const
 559 {
 560         return segment_display_mode_;
 561 }
 562
 563 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 564 {
 565         trigger_markers_.clear();
 566
 567         segment_display_mode_ = mode;
 568
 569         for (shared_ptr<Signal> signal : signals_)
 570                 signal->set_segment_display_mode(mode);
 571
 572         uint32_t last_segment = session_.get_segment_count() - 1;
 573
 574         switch (mode) {
 575         case Trace::ShowLastSegmentOnly:
 576                 if (current_segment_ != last_segment)
 577                         set_current_segment(last_segment);
 578                 break;
 579
 580         case Trace::ShowLastCompleteSegmentOnly:
 581                 // Do nothing if we only have one segment so far
 582                 if (last_segment > 0) {
 583                         // If the last segment isn't complete, the previous one must be
 584                         uint32_t segment_id =
 585                                 (session_.all_segments_complete(last_segment)) ?
 586                                 last_segment : last_segment - 1;
 587
 588                         if (current_segment_ != segment_id)
 589                                 set_current_segment(segment_id);
 590                 }
 591                 break;
 592
 593         case Trace::ShowSingleSegmentOnly:
 594         case Trace::ShowAllSegments:
 595         case Trace::ShowAccumulatedIntensity:
 596         default:
 597                 // Current segment remains as-is
 598                 break;
 599         }
 600
 601         segment_selectable_ = true;
 602
 603         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 604                 segment_selectable_ = false;
 605
 606         viewport_->update();
 607
 608         segment_display_mode_changed((int)mode, segment_selectable_);
 609 }
 610
 611 void View::zoom(double steps)
 612 {
 613         zoom(steps, viewport_->width() / 2);
 614 }
 615
 616 void View::zoom(double steps, int offset)
 617 {
 618         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 619 }
 620
 621 void View::zoom_fit(bool gui_state)
 622 {
 623         // Act as one-shot when stopped, toggle along with the GUI otherwise
 624         if (session_.get_capture_state() == Session::Stopped) {
 625                 always_zoom_to_fit_ = false;
 626                 always_zoom_to_fit_changed(false);
 627         } else {
 628                 always_zoom_to_fit_ = gui_state;
 629                 always_zoom_to_fit_changed(gui_state);
 630         }
 631
 632         const pair<Timestamp, Timestamp> extents = get_time_extents();
 633         const Timestamp delta = extents.second - extents.first;
 634         if (delta < Timestamp("1e-12"))
 635                 return;
 636
 637         assert(viewport_);
 638         const int w = viewport_->width();
 639         if (w <= 0)
 640                 return;
 641
 642         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 643         set_scale_offset(scale.convert_to<double>(), extents.first);
 644 }
 645
 646 void View::zoom_one_to_one()
 647 {
 648         using pv::data::SignalData;
 649
 650         // Make a set of all the visible data objects
 651         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 652         if (visible_data.empty())
 653                 return;
 654
 655         assert(viewport_);
 656         const int w = viewport_->width();
 657         if (w <= 0)
 658                 return;
 659
 660         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 661 }
 662
 663 void View::set_scale_offset(double scale, const Timestamp& offset)
 664 {
 665         // Disable sticky scrolling / always zoom to fit when acquisition runs
 666         // and user drags the viewport
 667         if ((scale_ == scale) && (offset_ != offset) &&
 668                         (session_.get_capture_state() == Session::Running)) {
 669
 670                 if (sticky_scrolling_) {
 671                         sticky_scrolling_ = false;
 672                         sticky_scrolling_changed(false);
 673                 }
 674
 675                 if (always_zoom_to_fit_) {
 676                         always_zoom_to_fit_ = false;
 677                         always_zoom_to_fit_changed(false);
 678                 }
 679         }
 680
 681         set_scale(scale);
 682         set_offset(offset);
 683
 684         calculate_tick_spacing();
 685
 686         update_scroll();
 687         ruler_->update();
 688         viewport_->update();
 689 }
 690
 691 set< shared_ptr<SignalData> > View::get_visible_data() const
 692 {
 693         // Make a set of all the visible data objects
 694         set< shared_ptr<SignalData> > visible_data;
 695         for (const shared_ptr<Signal> sig : signals_)
 696                 if (sig->enabled())
 697                         visible_data.insert(sig->data());
 698
 699         return visible_data;
 700 }
 701
 702 pair<Timestamp, Timestamp> View::get_time_extents() const
 703 {
 704         boost::optional<Timestamp> left_time, right_time;
 705         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 706         for (const shared_ptr<SignalData> d : visible_data) {
 707                 const vector< shared_ptr<Segment> > segments = d->segments();
 708                 for (const shared_ptr<Segment> &s : segments) {
 709                         double samplerate = s->samplerate();
 710                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 711
 712                         const Timestamp start_time = s->start_time();
 713                         left_time = left_time ?
 714                                 min(*left_time, start_time) :
 715                                                 start_time;
 716                         right_time = right_time ?
 717                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 718                                                  start_time + d->max_sample_count() / samplerate;
 719                 }
 720         }
 721
 722         if (!left_time || !right_time)
 723                 return make_pair(0, 0);
 724
 725         assert(*left_time < *right_time);
 726         return make_pair(*left_time, *right_time);
 727 }
 728
 729 void View::enable_show_sampling_points(bool state)
 730 {
 731         (void)state;
 732
 733         viewport_->update();
 734 }
 735
 736 void View::enable_show_analog_minor_grid(bool state)
 737 {
 738         (void)state;
 739
 740         viewport_->update();
 741 }
 742
 743 void View::enable_coloured_bg(bool state)
 744 {
 745         coloured_bg_ = state;
 746         viewport_->update();
 747 }
 748
 749 bool View::coloured_bg() const
 750 {
 751         return coloured_bg_;
 752 }
 753
 754 bool View::cursors_shown() const
 755 {
 756         return show_cursors_;
 757 }
 758
 759 void View::show_cursors(bool show)
 760 {
 761         show_cursors_ = show;
 762         ruler_->update();
 763         viewport_->update();
 764 }
 765
 766 void View::centre_cursors()
 767 {
 768         const double time_width = scale_ * viewport_->width();
 769         cursors_->first()->set_time(offset_ + time_width * 0.4);
 770         cursors_->second()->set_time(offset_ + time_width * 0.6);
 771         ruler_->update();
 772         viewport_->update();
 773 }
 774
 775 shared_ptr<CursorPair> View::cursors() const
 776 {
 777         return cursors_;
 778 }
 779
 780 void View::add_flag(const Timestamp& time)
 781 {
 782         flags_.push_back(make_shared<Flag>(*this, time,
 783                 QString("%1").arg(next_flag_text_)));
 784
 785         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 786                 (next_flag_text_ + 1);
 787
 788         time_item_appearance_changed(true, true);
 789 }
 790
 791 void View::remove_flag(shared_ptr<Flag> flag)
 792 {
 793         flags_.remove(flag);
 794         time_item_appearance_changed(true, true);
 795 }
 796
 797 vector< shared_ptr<Flag> > View::flags() const
 798 {
 799         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 800         stable_sort(flags.begin(), flags.end(),
 801                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 802                         return a->time() < b->time();
 803                 });
 804
 805         return flags;
 806 }
 807
 808 const QPoint& View::hover_point() const
 809 {
 810         return hover_point_;
 811 }
 812
 813 void View::restack_all_trace_tree_items()
 814 {
 815         // Make a list of owners that is sorted from deepest first
 816         const vector<shared_ptr<TraceTreeItem>> items(
 817                 list_by_type<TraceTreeItem>());
 818         set< TraceTreeItemOwner* > owners;
 819         for (const auto &r : items)
 820                 owners.insert(r->owner());
 821         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 822         sort(sorted_owners.begin(), sorted_owners.end(),
 823                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 824                         return a->depth() > b->depth(); });
 825
 826         // Restack the items recursively
 827         for (auto &o : sorted_owners)
 828                 o->restack_items();
 829
 830         // Animate the items to their destination
 831         for (const auto &i : items)
 832                 i->animate_to_layout_v_offset();
 833 }
 834
 835 void View::trigger_event(int segment_id, util::Timestamp location)
 836 {
 837         // TODO This doesn't work if we're showing multiple segments at once
 838         if ((uint32_t)segment_id != current_segment_)
 839                 return;
 840
 841         // Set up ruler_shift if the Key_View_TriggerIsZeroTime option is set.
 842         GlobalSettings settings;
 843         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 844
 845         ruler_shift_ = (trigger_is_zero_time) ? (-location) : (0);
 846         // Force an immediate update of both offsets
 847         offset_ -= 0.001;
 848         set_offset(offset_ + 0.001);
 849
 850         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 851 }
 852
 853 void View::get_scroll_layout(double &length, Timestamp &offset) const
 854 {
 855         const pair<Timestamp, Timestamp> extents = get_time_extents();
 856         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 857         offset = offset_ / scale_;
 858 }
 859
 860 void View::set_zoom(double scale, int offset)
 861 {
 862         // Reset the "always zoom to fit" feature as the user changed the zoom
 863         always_zoom_to_fit_ = false;
 864         always_zoom_to_fit_changed(false);
 865
 866         const Timestamp cursor_offset = offset_ + scale_ * offset;
 867         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 868         const Timestamp new_offset = cursor_offset - new_scale * offset;
 869         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 870 }
 871
 872 void View::calculate_tick_spacing()
 873 {
 874         const double SpacingIncrement = 10.0f;
 875         const double MinValueSpacing = 40.0f;
 876
 877         // Figure out the highest numeric value visible on a label
 878         const QSize areaSize = viewport_->size();
 879         const Timestamp max_time = max(fabs(offset_),
 880                 fabs(offset_ + scale_ * areaSize.width()));
 881
 882         double min_width = SpacingIncrement;
 883         double label_width, tick_period_width;
 884
 885         QFontMetrics m(QApplication::font());
 886
 887         // Copies of the member variables with the same name, used in the calculation
 888         // and written back afterwards, so that we don't emit signals all the time
 889         // during the calculation.
 890         pv::util::Timestamp tick_period = tick_period_;
 891         pv::util::SIPrefix tick_prefix = tick_prefix_;
 892         unsigned tick_precision = tick_precision_;
 893
 894         do {
 895                 const double min_period = scale_ * min_width;
 896
 897                 const int order = (int)floorf(log10f(min_period));
 898                 const pv::util::Timestamp order_decimal =
 899                         pow(pv::util::Timestamp(10), order);
 900
 901                 // Allow for a margin of error so that a scale unit of 1 can be used.
 902                 // Otherwise, for a SU of 1 the tick period will almost always be below
 903                 // the min_period by a small amount - and thus skipped in favor of 2.
 904                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 905                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 906                 double tp_with_margin;
 907                 unsigned int unit = 0;
 908
 909                 do {
 910                         tp_with_margin = order_decimal.convert_to<double>() *
 911                                 (ScaleUnits[unit++] + tp_margin);
 912                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 913
 914                 minor_tick_count_ = (unit == 2) ? (4) : (5);
 915                 tick_period = order_decimal * ScaleUnits[unit - 1];
 916                 tick_prefix = static_cast<pv::util::SIPrefix>(
 917                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 918
 919                 // Precision is the number of fractional digits required, not
 920                 // taking the prefix into account (and it must never be negative)
 921                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 922
 923                 tick_period_width = (tick_period / scale_).convert_to<double>();
 924
 925                 const QString label_text = Ruler::format_time_with_distance(
 926                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 927
 928                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 929                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 930                                 MinValueSpacing;
 931
 932                 min_width += SpacingIncrement;
 933         } while (tick_period_width < label_width);
 934
 935         set_tick_period(tick_period);
 936         set_tick_prefix(tick_prefix);
 937         set_tick_precision(tick_precision);
 938 }
 939
 940 void View::adjust_top_margin()
 941 {
 942         assert(viewport_);
 943
 944         const QSize areaSize = viewport_->size();
 945
 946         const pair<int, int> extents = v_extents();
 947         const int top_margin = owner_visual_v_offset() + extents.first;
 948         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
 949
 950         // Do we have empty space at the top while the last trace goes out of screen?
 951         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
 952                 const int trace_height = extents.second - extents.first;
 953
 954                 // Center everything vertically if there is enough space
 955                 if (areaSize.height() >= trace_height)
 956                         set_v_offset(extents.first -
 957                                 ((areaSize.height() - trace_height) / 2));
 958                 else
 959                         // Remove the top margin to make as many traces fit on screen as possible
 960                         set_v_offset(extents.first);
 961         }
 962 }
 963
 964 void View::update_scroll()
 965 {
 966         assert(viewport_);
 967         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
 968         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
 969
 970         const QSize areaSize = viewport_->size();
 971
 972         // Set the horizontal scroll bar
 973         double length = 0;
 974         Timestamp offset;
 975         get_scroll_layout(length, offset);
 976         length = max(length - areaSize.width(), 0.0);
 977
 978         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
 979
 980         hscrollbar->setPageStep(areaSize.width() / 2);
 981         hscrollbar->setSingleStep(major_tick_distance);
 982
 983         updating_scroll_ = true;
 984
 985         if (length < MaxScrollValue) {
 986                 hscrollbar->setRange(0, length);
 987                 hscrollbar->setSliderPosition(offset.convert_to<double>());
 988         } else {
 989                 hscrollbar->setRange(0, MaxScrollValue);
 990                 hscrollbar->setSliderPosition(
 991                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
 992         }
 993
 994         updating_scroll_ = false;
 995
 996         // Set the vertical scrollbar
 997         vscrollbar->setPageStep(areaSize.height());
 998         vscrollbar->setSingleStep(areaSize.height() / 8);
 999
1000         const pair<int, int> extents = v_extents();
1001
1002         // Don't change the scrollbar range if there are no traces
1003         if (extents.first != extents.second)
1004                 vscrollbar->setRange(extents.first - areaSize.height(),
1005                         extents.second);
1006
1007         if (scroll_needs_defaults_)
1008                 set_scroll_default();
1009 }
1010
1011 void View::reset_scroll()
1012 {
1013         scrollarea_->verticalScrollBar()->setRange(0, 0);
1014 }
1015
1016 void View::set_scroll_default()
1017 {
1018         assert(viewport_);
1019
1020         const QSize areaSize = viewport_->size();
1021
1022         const pair<int, int> extents = v_extents();
1023         const int trace_height = extents.second - extents.first;
1024
1025         // Do all traces fit in the view?
1026         if (areaSize.height() >= trace_height)
1027                 // Center all traces vertically
1028                 set_v_offset(extents.first -
1029                         ((areaSize.height() - trace_height) / 2));
1030         else
1031                 // Put the first trace at the top, letting the bottom ones overflow
1032                 set_v_offset(extents.first);
1033 }
1034
1035 void View::determine_if_header_was_shrunk()
1036 {
1037         const int header_pane_width = splitter_->sizes().front();
1038         const int header_width = header_->extended_size_hint().width();
1039
1040         // Allow for a slight margin of error so that we also accept
1041         // slight differences when e.g. a label name change increased
1042         // the overall width
1043         header_was_shrunk_ = (header_pane_width < (header_width - 10));
1044 }
1045
1046 void View::resize_header_to_fit()
1047 {
1048         // Setting the maximum width of the header widget doesn't work as
1049         // expected because the splitter would allow the user to make the
1050         // pane wider than that, creating empty space as a result.
1051         // To make this work, we stricly enforce the maximum width by
1052         // expanding the header unless the user shrunk it on purpose.
1053         // As we're then setting the width of the header pane, we set the
1054         // splitter to the maximum allowed position.
1055
1056         int splitter_area_width = 0;
1057         for (int w : splitter_->sizes())
1058                 splitter_area_width += w;
1059
1060         // Make sure the header has enough horizontal space to show all labels fully
1061         QList<int> pane_sizes;
1062         pane_sizes.push_back(header_->extended_size_hint().width());
1063         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1064         splitter_->setSizes(pane_sizes);
1065 }
1066
1067 void View::update_layout()
1068 {
1069         update_scroll();
1070 }
1071
1072 TraceTreeItemOwner* View::find_prevalent_trace_group(
1073         const shared_ptr<sigrok::ChannelGroup> &group,
1074         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1075                 &signal_map)
1076 {
1077         assert(group);
1078
1079         unordered_set<TraceTreeItemOwner*> owners;
1080         vector<TraceTreeItemOwner*> owner_list;
1081
1082         // Make a set and a list of all the owners
1083         for (const auto &channel : group->channels()) {
1084                 for (auto entry : signal_map) {
1085                         if (entry.first->channel() == channel) {
1086                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1087                                 owner_list.push_back(o);
1088                                 owners.insert(o);
1089                         }
1090                 }
1091         }
1092
1093         // Iterate through the list of owners, and find the most prevalent
1094         size_t max_prevalence = 0;
1095         TraceTreeItemOwner *prevalent_owner = nullptr;
1096         for (TraceTreeItemOwner *owner : owners) {
1097                 const size_t prevalence = count_if(
1098                         owner_list.begin(), owner_list.end(),
1099                         [&](TraceTreeItemOwner *o) { return o == owner; });
1100                 if (prevalence > max_prevalence) {
1101                         max_prevalence = prevalence;
1102                         prevalent_owner = owner;
1103                 }
1104         }
1105
1106         return prevalent_owner;
1107 }
1108
1109 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1110         const vector< shared_ptr<sigrok::Channel> > &channels,
1111         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1112                 &signal_map,
1113         set< shared_ptr<Trace> > &add_list)
1114 {
1115         vector< shared_ptr<Trace> > filtered_traces;
1116
1117         for (const auto &channel : channels) {
1118                 for (auto entry : signal_map) {
1119                         if (entry.first->channel() == channel) {
1120                                 shared_ptr<Trace> trace = entry.second;
1121                                 const auto list_iter = add_list.find(trace);
1122                                 if (list_iter == add_list.end())
1123                                         continue;
1124
1125                                 filtered_traces.push_back(trace);
1126                                 add_list.erase(list_iter);
1127                         }
1128                 }
1129         }
1130
1131         return filtered_traces;
1132 }
1133
1134 void View::determine_time_unit()
1135 {
1136         // Check whether we know the sample rate and hence can use time as the unit
1137         if (time_unit_ == util::TimeUnit::Samples) {
1138                 // Check all signals but...
1139                 for (const shared_ptr<Signal> signal : signals_) {
1140                         const shared_ptr<SignalData> data = signal->data();
1141
1142                         // ...only check first segment of each
1143                         const vector< shared_ptr<Segment> > segments = data->segments();
1144                         if (!segments.empty())
1145                                 if (segments[0]->samplerate()) {
1146                                         set_time_unit(util::TimeUnit::Time);
1147                                         break;
1148                                 }
1149                 }
1150         }
1151 }
1152
1153 bool View::eventFilter(QObject *object, QEvent *event)
1154 {
1155         const QEvent::Type type = event->type();
1156         if (type == QEvent::MouseMove) {
1157
1158                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1159                 if (object == viewport_)
1160                         hover_point_ = mouse_event->pos();
1161                 else if (object == ruler_)
1162                         hover_point_ = QPoint(mouse_event->x(), 0);
1163                 else if (object == header_)
1164                         hover_point_ = QPoint(0, mouse_event->y());
1165                 else
1166                         hover_point_ = QPoint(-1, -1);
1167
1168                 update_hover_point();
1169
1170         } else if (type == QEvent::Leave) {
1171                 hover_point_ = QPoint(-1, -1);
1172                 update_hover_point();
1173         } else if (type == QEvent::Show) {
1174
1175                 // This is somewhat of a hack, unfortunately. We cannot use
1176                 // set_v_offset() from within restore_settings() as the view
1177                 // at that point is neither visible nor properly sized.
1178                 // This is the least intrusive workaround I could come up
1179                 // with: set the vertical offset (or scroll defaults) when
1180                 // the view is shown, which happens after all widgets were
1181                 // resized to their final sizes.
1182                 update_layout();
1183
1184                 if (settings_restored_)
1185                         determine_if_header_was_shrunk();
1186                 else
1187                         resize_header_to_fit();
1188
1189                 if (scroll_needs_defaults_) {
1190                         set_scroll_default();
1191                         scroll_needs_defaults_ = false;
1192                 }
1193
1194                 if (saved_v_offset_) {
1195                         set_v_offset(saved_v_offset_);
1196                         saved_v_offset_ = 0;
1197                 }
1198         }
1199
1200         return QObject::eventFilter(object, event);
1201 }
1202
1203 void View::resizeEvent(QResizeEvent* event)
1204 {
1205         // Only adjust the top margin if we shrunk vertically
1206         if (event->size().height() < event->oldSize().height())
1207                 adjust_top_margin();
1208
1209         update_layout();
1210 }
1211
1212 void View::update_hover_point()
1213 {
1214         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1215                 list_by_type<TraceTreeItem>());
1216         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1217                 r->hover_point_changed(hover_point_);
1218
1219         hover_point_changed(hover_point_);
1220 }
1221
1222 void View::row_item_appearance_changed(bool label, bool content)
1223 {
1224         if (label)
1225                 header_->update();
1226         if (content)
1227                 viewport_->update();
1228 }
1229
1230 void View::time_item_appearance_changed(bool label, bool content)
1231 {
1232         if (label) {
1233                 ruler_->update();
1234
1235                 // Make sure the header pane width is updated, too
1236                 update_layout();
1237         }
1238
1239         if (content)
1240                 viewport_->update();
1241 }
1242
1243 void View::extents_changed(bool horz, bool vert)
1244 {
1245         sticky_events_ |=
1246                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1247                 (vert ? TraceTreeItemVExtentsChanged : 0);
1248
1249         lazy_event_handler_.start();
1250 }
1251
1252 void View::on_signal_name_changed()
1253 {
1254         if (!header_was_shrunk_)
1255                 resize_header_to_fit();
1256 }
1257
1258 void View::on_splitter_moved()
1259 {
1260         // The header can only shrink when the splitter is moved manually
1261         determine_if_header_was_shrunk();
1262
1263         if (!header_was_shrunk_)
1264                 resize_header_to_fit();
1265 }
1266
1267 void View::h_scroll_value_changed(int value)
1268 {
1269         if (updating_scroll_)
1270                 return;
1271
1272         // Disable sticky scrolling when user moves the horizontal scroll bar
1273         // during a running acquisition
1274         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1275                 sticky_scrolling_ = false;
1276                 sticky_scrolling_changed(false);
1277         }
1278
1279         const int range = scrollarea_->horizontalScrollBar()->maximum();
1280         if (range < MaxScrollValue)
1281                 set_offset(scale_ * value);
1282         else {
1283                 double length = 0;
1284                 Timestamp offset;
1285                 get_scroll_layout(length, offset);
1286                 set_offset(scale_ * length * value / MaxScrollValue);
1287         }
1288
1289         ruler_->update();
1290         viewport_->update();
1291 }
1292
1293 void View::v_scroll_value_changed()
1294 {
1295         header_->update();
1296         viewport_->update();
1297 }
1298
1299 void View::signals_changed()
1300 {
1301         using sigrok::Channel;
1302
1303         vector< shared_ptr<Channel> > channels;
1304         shared_ptr<sigrok::Device> sr_dev;
1305         bool signals_added_or_removed = false;
1306
1307         // Do we need to set the vertical scrollbar to its default position later?
1308         // We do if there are no traces, i.e. the scroll bar has no range set
1309         bool reset_scrollbar =
1310                 (scrollarea_->verticalScrollBar()->minimum() ==
1311                         scrollarea_->verticalScrollBar()->maximum());
1312
1313         if (!session_.device()) {
1314                 reset_scroll();
1315                 signals_.clear();
1316         } else {
1317                 sr_dev = session_.device()->device();
1318                 assert(sr_dev);
1319                 channels = sr_dev->channels();
1320         }
1321
1322         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1323
1324         // Make a list of traces that are being added, and a list of traces
1325         // that are being removed
1326         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1327         const set<shared_ptr<Trace>> prev_traces(
1328                 prev_trace_list.begin(), prev_trace_list.end());
1329
1330         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1331
1332 #ifdef ENABLE_DECODE
1333         traces.insert(decode_traces_.begin(), decode_traces_.end());
1334 #endif
1335
1336         set< shared_ptr<Trace> > add_traces;
1337         set_difference(traces.begin(), traces.end(),
1338                 prev_traces.begin(), prev_traces.end(),
1339                 inserter(add_traces, add_traces.begin()));
1340
1341         set< shared_ptr<Trace> > remove_traces;
1342         set_difference(prev_traces.begin(), prev_traces.end(),
1343                 traces.begin(), traces.end(),
1344                 inserter(remove_traces, remove_traces.begin()));
1345
1346         // Make a look-up table of sigrok Channels to pulseview Signals
1347         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1348                 signal_map;
1349         for (const shared_ptr<Signal> &sig : signals_)
1350                 signal_map[sig->base()] = sig;
1351
1352         // Populate channel groups
1353         if (sr_dev)
1354                 for (auto entry : sr_dev->channel_groups()) {
1355                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1356
1357                         if (group->channels().size() <= 1)
1358                                 continue;
1359
1360                         // Find best trace group to add to
1361                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1362                                 group, signal_map);
1363
1364                         // If there is no trace group, create one
1365                         shared_ptr<TraceGroup> new_trace_group;
1366                         if (!owner) {
1367                                 new_trace_group.reset(new TraceGroup());
1368                                 owner = new_trace_group.get();
1369                         }
1370
1371                         // Extract traces for the trace group, removing them from
1372                         // the add list
1373                         const vector< shared_ptr<Trace> > new_traces_in_group =
1374                                 extract_new_traces_for_channels(group->channels(),
1375                                         signal_map, add_traces);
1376
1377                         // Add the traces to the group
1378                         const pair<int, int> prev_v_extents = owner->v_extents();
1379                         int offset = prev_v_extents.second - prev_v_extents.first;
1380                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1381                                 assert(trace);
1382                                 owner->add_child_item(trace);
1383
1384                                 const pair<int, int> extents = trace->v_extents();
1385                                 if (trace->enabled())
1386                                         offset += -extents.first;
1387                                 trace->force_to_v_offset(offset);
1388                                 if (trace->enabled())
1389                                         offset += extents.second;
1390                         }
1391
1392                         if (new_trace_group) {
1393                                 // Assign proper vertical offsets to each channel in the group
1394                                 new_trace_group->restack_items();
1395
1396                                 // If this is a new group, enqueue it in the new top level
1397                                 // items list
1398                                 if (!new_traces_in_group.empty())
1399                                         new_top_level_items.push_back(new_trace_group);
1400                         }
1401                 }
1402
1403         // Enqueue the remaining logic channels in a group
1404         vector< shared_ptr<Channel> > logic_channels;
1405         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1406                 [](const shared_ptr<Channel>& c) {
1407                         return c->type() == sigrok::ChannelType::LOGIC; });
1408
1409         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1410                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1411
1412         if (non_grouped_logic_signals.size() > 0) {
1413                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1414                         make_shared<TraceGroup>());
1415                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1416                         non_grouped_trace_group->add_child_item(trace);
1417
1418                 non_grouped_trace_group->restack_items();
1419                 new_top_level_items.push_back(non_grouped_trace_group);
1420         }
1421
1422         // Enqueue the remaining channels as free ungrouped traces
1423         const vector< shared_ptr<Trace> > new_top_level_signals =
1424                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1425         new_top_level_items.insert(new_top_level_items.end(),
1426                 new_top_level_signals.begin(), new_top_level_signals.end());
1427
1428         // Enqueue any remaining traces i.e. decode traces
1429         new_top_level_items.insert(new_top_level_items.end(),
1430                 add_traces.begin(), add_traces.end());
1431
1432         // Remove any removed traces
1433         for (shared_ptr<Trace> trace : remove_traces) {
1434                 TraceTreeItemOwner *const owner = trace->owner();
1435                 assert(owner);
1436                 owner->remove_child_item(trace);
1437                 signals_added_or_removed = true;
1438         }
1439
1440         // Remove any empty trace groups
1441         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1442                 if (group->child_items().size() == 0) {
1443                         remove_child_item(group);
1444                         group.reset();
1445                 }
1446
1447         // Add and position the pending top levels items
1448         int offset = v_extents().second;
1449         for (auto item : new_top_level_items) {
1450                 add_child_item(item);
1451
1452                 // Position the item after the last item or at the top if there is none
1453                 const pair<int, int> extents = item->v_extents();
1454
1455                 if (item->enabled())
1456                         offset += -extents.first;
1457
1458                 item->force_to_v_offset(offset);
1459
1460                 if (item->enabled())
1461                         offset += extents.second;
1462                 signals_added_or_removed = true;
1463         }
1464
1465
1466         if (signals_added_or_removed && !header_was_shrunk_)
1467                 resize_header_to_fit();
1468
1469         update_layout();
1470
1471         header_->update();
1472         viewport_->update();
1473
1474         if (reset_scrollbar)
1475                 set_scroll_default();
1476 }
1477
1478 void View::capture_state_updated(int state)
1479 {
1480         GlobalSettings settings;
1481
1482         if (state == Session::Running) {
1483                 set_time_unit(util::TimeUnit::Samples);
1484
1485                 trigger_markers_.clear();
1486
1487                 scale_at_acq_start_ = scale_;
1488                 offset_at_acq_start_ = offset_;
1489
1490                 // Activate "always zoom to fit" if the setting is enabled and we're
1491                 // the main view of this session (other trace views may be used for
1492                 // zooming and we don't want to mess them up)
1493                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1494                 if (is_main_view_ && state) {
1495                         always_zoom_to_fit_ = true;
1496                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1497                 }
1498
1499                 // Enable sticky scrolling if the setting is enabled
1500                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1501
1502                 // Reset all traces to segment 0
1503                 current_segment_ = 0;
1504                 set_current_segment(current_segment_);
1505         }
1506
1507         if (state == Session::Stopped) {
1508                 // After acquisition has stopped we need to re-calculate the ticks once
1509                 // as it's otherwise done when the user pans or zooms, which is too late
1510                 calculate_tick_spacing();
1511
1512                 // Reset "always zoom to fit", the acquisition has stopped
1513                 if (always_zoom_to_fit_) {
1514                         // Perform a final zoom-to-fit before disabling
1515                         zoom_fit(always_zoom_to_fit_);
1516                         always_zoom_to_fit_ = false;
1517                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1518                 }
1519
1520                 bool zoom_to_fit_after_acq =
1521                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1522
1523                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1524                 // we didn't restore settings in the meanwhile
1525                 if (zoom_to_fit_after_acq &&
1526                         !suppress_zoom_to_fit_after_acq_ &&
1527                         (scale_ == scale_at_acq_start_) &&
1528                         (offset_ == offset_at_acq_start_))
1529                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1530
1531                 suppress_zoom_to_fit_after_acq_ = false;
1532         }
1533 }
1534
1535 void View::on_new_segment(int new_segment_id)
1536 {
1537         on_segment_changed(new_segment_id);
1538 }
1539
1540 void View::on_segment_completed(int segment_id)
1541 {
1542         on_segment_changed(segment_id);
1543 }
1544
1545 void View::on_segment_changed(int segment)
1546 {
1547         switch (segment_display_mode_) {
1548         case Trace::ShowLastSegmentOnly:
1549         case Trace::ShowSingleSegmentOnly:
1550                 set_current_segment(segment);
1551                 break;
1552
1553         case Trace::ShowLastCompleteSegmentOnly:
1554                 // Only update if all segments are complete
1555                 if (session_.all_segments_complete(segment))
1556                         set_current_segment(segment);
1557                 break;
1558
1559         case Trace::ShowAllSegments:
1560         case Trace::ShowAccumulatedIntensity:
1561         default:
1562                 break;
1563         }
1564 }
1565
1566 void View::perform_delayed_view_update()
1567 {
1568         if (always_zoom_to_fit_) {
1569                 zoom_fit(true);
1570         } else if (sticky_scrolling_) {
1571                 // Make right side of the view sticky
1572                 double length = 0;
1573                 Timestamp offset;
1574                 get_scroll_layout(length, offset);
1575
1576                 const QSize areaSize = viewport_->size();
1577                 length = max(length - areaSize.width(), 0.0);
1578
1579                 set_offset(scale_ * length);
1580         }
1581
1582         determine_time_unit();
1583         update_scroll();
1584         ruler_->update();
1585         viewport_->update();
1586 }
1587
1588 void View::process_sticky_events()
1589 {
1590         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1591                 update_layout();
1592         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1593                 restack_all_trace_tree_items();
1594                 update_scroll();
1595         }
1596
1597         // Clear the sticky events
1598         sticky_events_ = 0;
1599 }
1600
1601 } // namespace trace
1602 } // namespace views
1603 } // namespace pv