pv/views/trace/view.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifdef ENABLE_DECODE
  21 #include <libsigrokdecode/libsigrokdecode.h>
  22 #endif
  23
  24 #include <extdef.h>
  25
  26 #include <algorithm>
  27 #include <cassert>
  28 #include <climits>
  29 #include <cmath>
  30 #include <iostream>
  31 #include <iterator>
  32 #include <unordered_set>
  33
  34 #include <boost/archive/text_iarchive.hpp>
  35 #include <boost/archive/text_oarchive.hpp>
  36 #include <boost/serialization/serialization.hpp>
  37
  38 #include <QApplication>
  39 #include <QEvent>
  40 #include <QFontMetrics>
  41 #include <QMenu>
  42 #include <QMouseEvent>
  43 #include <QScrollBar>
  44 #include <QVBoxLayout>
  45
  46 #include <libsigrokcxx/libsigrokcxx.hpp>
  47
  48 #include "analogsignal.hpp"
  49 #include "header.hpp"
  50 #include "logicsignal.hpp"
  51 #include "ruler.hpp"
  52 #include "signal.hpp"
  53 #include "tracegroup.hpp"
  54 #include "triggermarker.hpp"
  55 #include "view.hpp"
  56 #include "viewport.hpp"
  57
  58 #include "pv/data/logic.hpp"
  59 #include "pv/data/logicsegment.hpp"
  60 #include "pv/devices/device.hpp"
  61 #include "pv/globalsettings.hpp"
  62 #include "pv/session.hpp"
  63 #include "pv/util.hpp"
  64
  65 #ifdef ENABLE_DECODE
  66 #include "decodetrace.hpp"
  67 #endif
  68
  69 using pv::data::SignalData;
  70 using pv::data::Segment;
  71 using pv::util::TimeUnit;
  72 using pv::util::Timestamp;
  73
  74 using std::back_inserter;
  75 using std::copy_if;
  76 using std::count_if;
  77 using std::inserter;
  78 using std::max;
  79 using std::make_pair;
  80 using std::make_shared;
  81 using std::min;
  82 using std::numeric_limits;
  83 using std::pair;
  84 using std::set;
  85 using std::set_difference;
  86 using std::shared_ptr;
  87 using std::stringstream;
  88 using std::unordered_map;
  89 using std::unordered_set;
  90 using std::vector;
  91
  92 namespace pv {
  93 namespace views {
  94 namespace trace {
  95
  96 const Timestamp View::MaxScale("1e9");
  97 const Timestamp View::MinScale("1e-12");
  98
  99 const int View::MaxScrollValue = INT_MAX / 2;
 100
 101 const int View::ScaleUnits[3] = {1, 2, 5};
 102
 103
 104 CustomScrollArea::CustomScrollArea(QWidget *parent) :
 105         QAbstractScrollArea(parent)
 106 {
 107 }
 108
 109 bool CustomScrollArea::viewportEvent(QEvent *event)
 110 {
 111         switch (event->type()) {
 112         case QEvent::Paint:
 113         case QEvent::MouseButtonPress:
 114         case QEvent::MouseButtonRelease:
 115         case QEvent::MouseButtonDblClick:
 116         case QEvent::MouseMove:
 117         case QEvent::Wheel:
 118         case QEvent::TouchBegin:
 119         case QEvent::TouchUpdate:
 120         case QEvent::TouchEnd:
 121                 return false;
 122         default:
 123                 return QAbstractScrollArea::viewportEvent(event);
 124         }
 125 }
 126
 127 View::View(Session &session, bool is_main_view, QWidget *parent) :
 128         ViewBase(session, is_main_view, parent),
 129
 130         // Note: Place defaults in View::reset_view_state(), not here
 131         splitter_(new QSplitter()),
 132         header_was_shrunk_(false),  // The splitter remains unchanged after a reset, so this goes here
 133         sticky_scrolling_(false),  // Default setting is set in MainWindow::setup_ui()
 134         scroll_needs_defaults_(true)
 135 {
 136         QVBoxLayout *root_layout = new QVBoxLayout(this);
 137         root_layout->setContentsMargins(0, 0, 0, 0);
 138         root_layout->addWidget(splitter_);
 139
 140         viewport_ = new Viewport(*this);
 141         scrollarea_ = new CustomScrollArea(splitter_);
 142         scrollarea_->setViewport(viewport_);
 143         scrollarea_->setFrameShape(QFrame::NoFrame);
 144
 145         ruler_ = new Ruler(*this);
 146
 147         header_ = new Header(*this);
 148         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 149
 150         // We put the header into a simple layout so that we can add the top margin,
 151         // allowing us to make it line up with the bottom of the ruler
 152         QWidget *header_container = new QWidget();
 153         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 154         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 155         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 156         header_layout->addWidget(header_);
 157
 158         // To let the ruler and scrollarea be on the same split pane, we need a layout
 159         QWidget *trace_container = new QWidget();
 160         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 161         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 162         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 163         trace_layout->setContentsMargins(0, 0, 0, 0);
 164         trace_layout->addWidget(ruler_);
 165         trace_layout->addWidget(scrollarea_);
 166
 167         splitter_->addWidget(header_container);
 168         splitter_->addWidget(trace_container);
 169         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 170         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 171         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 172         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 173         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 174         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 175
 176         viewport_->installEventFilter(this);
 177         ruler_->installEventFilter(this);
 178         header_->installEventFilter(this);
 179
 180         // Set up settings and event handlers
 181         GlobalSettings settings;
 182         colored_bg_ = settings.value(GlobalSettings::Key_View_ColoredBG).toBool();
 183         snap_distance_ = settings.value(GlobalSettings::Key_View_SnapDistance).toInt();
 184
 185         GlobalSettings::add_change_handler(this);
 186
 187         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 188                 this, SLOT(h_scroll_value_changed(int)));
 189         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 190                 this, SLOT(v_scroll_value_changed()));
 191
 192         connect(header_, SIGNAL(selection_changed()),
 193                 ruler_, SLOT(clear_selection()));
 194         connect(ruler_, SIGNAL(selection_changed()),
 195                 header_, SLOT(clear_selection()));
 196
 197         connect(header_, SIGNAL(selection_changed()),
 198                 this, SIGNAL(selection_changed()));
 199         connect(ruler_, SIGNAL(selection_changed()),
 200                 this, SIGNAL(selection_changed()));
 201
 202         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 203                 this, SLOT(on_splitter_moved()));
 204
 205         connect(&lazy_event_handler_, SIGNAL(timeout()),
 206                 this, SLOT(process_sticky_events()));
 207         lazy_event_handler_.setSingleShot(true);
 208
 209         // Trigger the initial event manually. The default device has signals
 210         // which were created before this object came into being
 211         signals_changed();
 212
 213         // make sure the transparent widgets are on the top
 214         ruler_->raise();
 215         header_->raise();
 216
 217         reset_view_state();
 218 }
 219
 220 View::~View()
 221 {
 222         GlobalSettings::remove_change_handler(this);
 223 }
 224
 225 void View::reset_view_state()
 226 {
 227         ViewBase::reset_view_state();
 228
 229         segment_display_mode_ = Trace::ShowLastSegmentOnly;
 230         segment_selectable_ = false;
 231         scale_ = 1e-3;
 232         offset_ = 0;
 233         ruler_offset_ = 0;
 234         updating_scroll_ = false;
 235         settings_restored_ = false;
 236         always_zoom_to_fit_ = false;
 237         tick_period_ = 0;
 238         tick_prefix_ = pv::util::SIPrefix::yocto;
 239         tick_precision_ = 0;
 240         time_unit_ = util::TimeUnit::Time;
 241         show_cursors_ = false;
 242         cursors_ = make_shared<CursorPair>(*this);
 243         next_flag_text_ = 'A';
 244         trigger_markers_.clear();
 245         hover_widget_ = nullptr;
 246         hover_point_ = QPoint(-1, -1);
 247         scroll_needs_defaults_ = true;
 248         saved_v_offset_ = 0;
 249         scale_at_acq_start_ = 0;
 250         offset_at_acq_start_ = 0;
 251         suppress_zoom_to_fit_after_acq_ = false;
 252
 253         show_cursors_ = false;
 254         cursor_state_changed(show_cursors_);
 255         flags_.clear();
 256
 257         // Update the zoom state
 258         calculate_tick_spacing();
 259
 260         // Make sure the standard bar's segment selector is in sync
 261         set_segment_display_mode(segment_display_mode_);
 262 }
 263
 264 Session& View::session()
 265 {
 266         return session_;
 267 }
 268
 269 const Session& View::session() const
 270 {
 271         return session_;
 272 }
 273
 274 unordered_set< shared_ptr<Signal> > View::signals() const
 275 {
 276         return signals_;
 277 }
 278
 279 void View::clear_signals()
 280 {
 281         ViewBase::clear_signalbases();
 282         signals_.clear();
 283 }
 284
 285 void View::add_signal(const shared_ptr<Signal> signal)
 286 {
 287         ViewBase::add_signalbase(signal->base());
 288         signals_.insert(signal);
 289
 290         signal->set_segment_display_mode(segment_display_mode_);
 291         signal->set_current_segment(current_segment_);
 292
 293         connect(signal->base().get(), SIGNAL(name_changed(const QString&)),
 294                 this, SLOT(on_signal_name_changed()));
 295 }
 296
 297 #ifdef ENABLE_DECODE
 298 void View::clear_decode_signals()
 299 {
 300         decode_traces_.clear();
 301 }
 302
 303 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 304 {
 305         shared_ptr<DecodeTrace> d(
 306                 new DecodeTrace(session_, signal, decode_traces_.size()));
 307         decode_traces_.push_back(d);
 308
 309         d->set_segment_display_mode(segment_display_mode_);
 310         d->set_current_segment(current_segment_);
 311
 312         connect(signal.get(), SIGNAL(name_changed(const QString&)),
 313                 this, SLOT(on_signal_name_changed()));
 314 }
 315
 316 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 317 {
 318         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 319                 if ((*i)->base() == signal) {
 320                         decode_traces_.erase(i);
 321                         signals_changed();
 322                         return;
 323                 }
 324 }
 325 #endif
 326
 327 shared_ptr<Signal> View::get_signal_under_mouse_cursor() const
 328 {
 329         return signal_under_mouse_cursor_;
 330 }
 331
 332 View* View::view()
 333 {
 334         return this;
 335 }
 336
 337 const View* View::view() const
 338 {
 339         return this;
 340 }
 341
 342 Viewport* View::viewport()
 343 {
 344         return viewport_;
 345 }
 346
 347 const Viewport* View::viewport() const
 348 {
 349         return viewport_;
 350 }
 351
 352 const Ruler* View::ruler() const
 353 {
 354         return ruler_;
 355 }
 356
 357 void View::save_settings(QSettings &settings) const
 358 {
 359         settings.setValue("scale", scale_);
 360         settings.setValue("v_offset",
 361                 scrollarea_->verticalScrollBar()->sliderPosition());
 362
 363         settings.setValue("splitter_state", splitter_->saveState());
 364         settings.setValue("segment_display_mode", segment_display_mode_);
 365
 366         {
 367                 stringstream ss;
 368                 boost::archive::text_oarchive oa(ss);
 369                 oa << boost::serialization::make_nvp("offset", offset_);
 370                 settings.setValue("offset", QString::fromStdString(ss.str()));
 371         }
 372
 373         for (const shared_ptr<Signal>& signal : signals_) {
 374                 settings.beginGroup(signal->base()->internal_name());
 375                 signal->save_settings(settings);
 376                 settings.endGroup();
 377         }
 378 }
 379
 380 void View::restore_settings(QSettings &settings)
 381 {
 382         // Note: It is assumed that this function is only called once,
 383         // immediately after restoring a previous session.
 384
 385         if (settings.contains("scale"))
 386                 set_scale(settings.value("scale").toDouble());
 387
 388         if (settings.contains("offset")) {
 389                 util::Timestamp offset;
 390                 stringstream ss;
 391                 ss << settings.value("offset").toString().toStdString();
 392
 393                 try {
 394                         boost::archive::text_iarchive ia(ss);
 395                         ia >> boost::serialization::make_nvp("offset", offset);
 396                         // This also updates ruler_offset_
 397                         set_offset(offset);
 398                 } catch (boost::archive::archive_exception&) {
 399                         qDebug() << "Could not restore the view offset";
 400                 }
 401         }
 402
 403         if (settings.contains("splitter_state"))
 404                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 405
 406         if (settings.contains("segment_display_mode"))
 407                 set_segment_display_mode(
 408                         (Trace::SegmentDisplayMode)(settings.value("segment_display_mode").toInt()));
 409
 410         for (shared_ptr<Signal> signal : signals_) {
 411                 settings.beginGroup(signal->base()->internal_name());
 412                 signal->restore_settings(settings);
 413                 settings.endGroup();
 414         }
 415
 416         if (settings.contains("v_offset")) {
 417                 saved_v_offset_ = settings.value("v_offset").toInt();
 418                 set_v_offset(saved_v_offset_);
 419                 scroll_needs_defaults_ = false;
 420                 // Note: see eventFilter() for additional information
 421         }
 422
 423         settings_restored_ = true;
 424         suppress_zoom_to_fit_after_acq_ = true;
 425
 426         // Update the ruler so that it uses the new scale
 427         calculate_tick_spacing();
 428 }
 429
 430 vector< shared_ptr<TimeItem> > View::time_items() const
 431 {
 432         const vector<shared_ptr<Flag>> f(flags());
 433         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 434
 435         if (cursors_) {
 436                 items.push_back(cursors_);
 437                 items.push_back(cursors_->first());
 438                 items.push_back(cursors_->second());
 439         }
 440
 441         for (auto& trigger_marker : trigger_markers_)
 442                 items.push_back(trigger_marker);
 443
 444         return items;
 445 }
 446
 447 double View::scale() const
 448 {
 449         return scale_;
 450 }
 451
 452 void View::set_scale(double scale)
 453 {
 454         if (scale_ != scale) {
 455                 scale_ = scale;
 456                 scale_changed();
 457         }
 458 }
 459
 460 void View::set_offset(const pv::util::Timestamp& offset, bool force_update)
 461 {
 462         if ((offset_ != offset) || force_update) {
 463                 offset_ = offset;
 464                 ruler_offset_ = offset_ + zero_offset_;
 465                 offset_changed();
 466         }
 467 }
 468
 469 const Timestamp& View::offset() const
 470 {
 471         return offset_;
 472 }
 473
 474 const Timestamp& View::ruler_offset() const
 475 {
 476         return ruler_offset_;
 477 }
 478
 479 void View::set_zero_position(const pv::util::Timestamp& position)
 480 {
 481         zero_offset_ = -position;
 482
 483         // Force an immediate update of the offsets
 484         set_offset(offset_, true);
 485         ruler_->update();
 486 }
 487
 488 void View::reset_zero_position()
 489 {
 490         zero_offset_ = 0;
 491
 492         // Force an immediate update of the offsets
 493         set_offset(offset_, true);
 494         ruler_->update();
 495 }
 496
 497 pv::util::Timestamp View::zero_offset() const
 498 {
 499         return zero_offset_;
 500 }
 501
 502 int View::owner_visual_v_offset() const
 503 {
 504         return -scrollarea_->verticalScrollBar()->sliderPosition();
 505 }
 506
 507 void View::set_v_offset(int offset)
 508 {
 509         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 510         header_->update();
 511         viewport_->update();
 512 }
 513
 514 void View::set_h_offset(int offset)
 515 {
 516         scrollarea_->horizontalScrollBar()->setSliderPosition(offset);
 517         header_->update();
 518         viewport_->update();
 519 }
 520
 521 int View::get_h_scrollbar_maximum() const
 522 {
 523         return scrollarea_->horizontalScrollBar()->maximum();
 524 }
 525
 526 unsigned int View::depth() const
 527 {
 528         return 0;
 529 }
 530
 531 uint32_t View::current_segment() const
 532 {
 533         return current_segment_;
 534 }
 535
 536 pv::util::SIPrefix View::tick_prefix() const
 537 {
 538         return tick_prefix_;
 539 }
 540
 541 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 542 {
 543         if (tick_prefix_ != tick_prefix) {
 544                 tick_prefix_ = tick_prefix;
 545                 tick_prefix_changed();
 546         }
 547 }
 548
 549 unsigned int View::tick_precision() const
 550 {
 551         return tick_precision_;
 552 }
 553
 554 void View::set_tick_precision(unsigned tick_precision)
 555 {
 556         if (tick_precision_ != tick_precision) {
 557                 tick_precision_ = tick_precision;
 558                 tick_precision_changed();
 559         }
 560 }
 561
 562 const pv::util::Timestamp& View::tick_period() const
 563 {
 564         return tick_period_;
 565 }
 566
 567 unsigned int View::minor_tick_count() const
 568 {
 569         return minor_tick_count_;
 570 }
 571
 572 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 573 {
 574         if (tick_period_ != tick_period) {
 575                 tick_period_ = tick_period;
 576                 tick_period_changed();
 577         }
 578 }
 579
 580 TimeUnit View::time_unit() const
 581 {
 582         return time_unit_;
 583 }
 584
 585 void View::set_time_unit(pv::util::TimeUnit time_unit)
 586 {
 587         if (time_unit_ != time_unit) {
 588                 time_unit_ = time_unit;
 589                 time_unit_changed();
 590         }
 591 }
 592
 593 void View::set_current_segment(uint32_t segment_id)
 594 {
 595         current_segment_ = segment_id;
 596
 597         for (const shared_ptr<Signal>& signal : signals_)
 598                 signal->set_current_segment(current_segment_);
 599 #ifdef ENABLE_DECODE
 600         for (shared_ptr<DecodeTrace>& dt : decode_traces_)
 601                 dt->set_current_segment(current_segment_);
 602 #endif
 603
 604         vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
 605
 606         trigger_markers_.clear();
 607         for (util::Timestamp timestamp : triggers)
 608                 trigger_markers_.push_back(make_shared<TriggerMarker>(*this, timestamp));
 609
 610         // When enabled, the first trigger for this segment is used as the zero position
 611         GlobalSettings settings;
 612         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 613
 614         if (trigger_is_zero_time && (triggers.size() > 0))
 615                 set_zero_position(triggers.front());
 616
 617         viewport_->update();
 618
 619         segment_changed(segment_id);
 620 }
 621
 622 bool View::segment_is_selectable() const
 623 {
 624         return segment_selectable_;
 625 }
 626
 627 Trace::SegmentDisplayMode View::segment_display_mode() const
 628 {
 629         return segment_display_mode_;
 630 }
 631
 632 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 633 {
 634         segment_display_mode_ = mode;
 635
 636         for (const shared_ptr<Signal>& signal : signals_)
 637                 signal->set_segment_display_mode(mode);
 638
 639         uint32_t last_segment = session_.get_segment_count() - 1;
 640
 641         switch (mode) {
 642         case Trace::ShowLastSegmentOnly:
 643                 if (current_segment_ != last_segment)
 644                         set_current_segment(last_segment);
 645                 break;
 646
 647         case Trace::ShowLastCompleteSegmentOnly:
 648                 // Do nothing if we only have one segment so far
 649                 if (last_segment > 0) {
 650                         // If the last segment isn't complete, the previous one must be
 651                         uint32_t segment_id =
 652                                 (session_.all_segments_complete(last_segment)) ?
 653                                 last_segment : last_segment - 1;
 654
 655                         if (current_segment_ != segment_id)
 656                                 set_current_segment(segment_id);
 657                 }
 658                 break;
 659
 660         case Trace::ShowSingleSegmentOnly:
 661         case Trace::ShowAllSegments:
 662         case Trace::ShowAccumulatedIntensity:
 663         default:
 664                 // Current segment remains as-is
 665                 break;
 666         }
 667
 668         segment_selectable_ = true;
 669
 670         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 671                 segment_selectable_ = false;
 672
 673         viewport_->update();
 674
 675         segment_display_mode_changed((int)mode, segment_selectable_);
 676 }
 677
 678 void View::zoom(double steps)
 679 {
 680         zoom(steps, viewport_->width() / 2);
 681 }
 682
 683 void View::zoom(double steps, int offset)
 684 {
 685         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 686 }
 687
 688 void View::zoom_fit(bool gui_state)
 689 {
 690         // Act as one-shot when stopped, toggle along with the GUI otherwise
 691         if (session_.get_capture_state() == Session::Stopped) {
 692                 always_zoom_to_fit_ = false;
 693                 always_zoom_to_fit_changed(false);
 694         } else {
 695                 always_zoom_to_fit_ = gui_state;
 696                 always_zoom_to_fit_changed(gui_state);
 697         }
 698
 699         const pair<Timestamp, Timestamp> extents = get_time_extents();
 700         const Timestamp delta = extents.second - extents.first;
 701         if (delta < Timestamp("1e-12"))
 702                 return;
 703
 704         assert(viewport_);
 705         const int w = viewport_->width();
 706         if (w <= 0)
 707                 return;
 708
 709         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 710         set_scale_offset(scale.convert_to<double>(), extents.first);
 711 }
 712
 713 void View::set_scale_offset(double scale, const Timestamp& offset)
 714 {
 715         // Disable sticky scrolling / always zoom to fit when acquisition runs
 716         // and user drags the viewport
 717         if ((scale_ == scale) && (offset_ != offset) &&
 718                         (session_.get_capture_state() == Session::Running)) {
 719
 720                 if (sticky_scrolling_) {
 721                         sticky_scrolling_ = false;
 722                         sticky_scrolling_changed(false);
 723                 }
 724
 725                 if (always_zoom_to_fit_) {
 726                         always_zoom_to_fit_ = false;
 727                         always_zoom_to_fit_changed(false);
 728                 }
 729         }
 730
 731         set_scale(scale);
 732         set_offset(offset);
 733
 734         calculate_tick_spacing();
 735
 736         update_scroll();
 737         ruler_->update();
 738         viewport_->update();
 739 }
 740
 741 set< shared_ptr<SignalData> > View::get_visible_data() const
 742 {
 743         // Make a set of all the visible data objects
 744         set< shared_ptr<SignalData> > visible_data;
 745         for (const shared_ptr<Signal>& sig : signals_)
 746                 if (sig->enabled())
 747                         visible_data.insert(sig->data());
 748
 749         return visible_data;
 750 }
 751
 752 pair<Timestamp, Timestamp> View::get_time_extents() const
 753 {
 754         boost::optional<Timestamp> left_time, right_time;
 755         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 756         for (const shared_ptr<SignalData>& d : visible_data) {
 757                 const vector< shared_ptr<Segment> > segments = d->segments();
 758                 for (const shared_ptr<Segment>& s : segments) {
 759                         double samplerate = s->samplerate();
 760                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 761
 762                         const Timestamp start_time = s->start_time();
 763                         left_time = left_time ?
 764                                 min(*left_time, start_time) :
 765                                                 start_time;
 766                         right_time = right_time ?
 767                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 768                                                  start_time + d->max_sample_count() / samplerate;
 769                 }
 770         }
 771
 772         if (!left_time || !right_time)
 773                 return make_pair(0, 0);
 774
 775         assert(*left_time < *right_time);
 776         return make_pair(*left_time, *right_time);
 777 }
 778
 779 void View::enable_show_sampling_points(bool state)
 780 {
 781         (void)state;
 782
 783         viewport_->update();
 784 }
 785
 786 void View::enable_show_analog_minor_grid(bool state)
 787 {
 788         (void)state;
 789
 790         viewport_->update();
 791 }
 792
 793 void View::enable_colored_bg(bool state)
 794 {
 795         colored_bg_ = state;
 796         viewport_->update();
 797 }
 798
 799 bool View::colored_bg() const
 800 {
 801         return colored_bg_;
 802 }
 803
 804 bool View::cursors_shown() const
 805 {
 806         return show_cursors_;
 807 }
 808
 809 void View::show_cursors(bool show)
 810 {
 811         if (show_cursors_ != show) {
 812                 show_cursors_ = show;
 813
 814                 cursor_state_changed(show);
 815                 ruler_->update();
 816                 viewport_->update();
 817         }
 818 }
 819
 820 void View::set_cursors(pv::util::Timestamp& first, pv::util::Timestamp& second)
 821 {
 822         assert(cursors_);
 823
 824         cursors_->first()->set_time(first);
 825         cursors_->second()->set_time(second);
 826
 827         ruler_->update();
 828         viewport_->update();
 829 }
 830
 831 void View::centre_cursors()
 832 {
 833         assert(cursors_);
 834
 835         const double time_width = scale_ * viewport_->width();
 836         cursors_->first()->set_time(offset_ + time_width * 0.4);
 837         cursors_->second()->set_time(offset_ + time_width * 0.6);
 838
 839         ruler_->update();
 840         viewport_->update();
 841 }
 842
 843 shared_ptr<CursorPair> View::cursors() const
 844 {
 845         return cursors_;
 846 }
 847
 848 shared_ptr<Flag> View::add_flag(const Timestamp& time)
 849 {
 850         shared_ptr<Flag> flag =
 851                 make_shared<Flag>(*this, time, QString("%1").arg(next_flag_text_));
 852         flags_.push_back(flag);
 853
 854         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 855                 (next_flag_text_ + 1);
 856
 857         time_item_appearance_changed(true, true);
 858         return flag;
 859 }
 860
 861 void View::remove_flag(shared_ptr<Flag> flag)
 862 {
 863         flags_.remove(flag);
 864         time_item_appearance_changed(true, true);
 865 }
 866
 867 vector< shared_ptr<Flag> > View::flags() const
 868 {
 869         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 870         stable_sort(flags.begin(), flags.end(),
 871                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 872                         return a->time() < b->time();
 873                 });
 874
 875         return flags;
 876 }
 877
 878 const QPoint& View::hover_point() const
 879 {
 880         return hover_point_;
 881 }
 882
 883 const QWidget* View::hover_widget() const
 884 {
 885         return hover_widget_;
 886 }
 887
 888 int64_t View::get_nearest_level_change(const QPoint &p)
 889 {
 890         // Is snapping disabled?
 891         if (snap_distance_ == 0)
 892                 return -1;
 893
 894         struct entry_t {
 895                 entry_t(shared_ptr<Signal> s) :
 896                         signal(s), delta(numeric_limits<int64_t>::max()), sample(-1), is_dense(false) {}
 897                 shared_ptr<Signal> signal;
 898                 int64_t delta;
 899                 int64_t sample;
 900                 bool is_dense;
 901         };
 902
 903         vector<entry_t> list;
 904
 905         // Create list of signals to consider
 906         if (signal_under_mouse_cursor_)
 907                 list.emplace_back(signal_under_mouse_cursor_);
 908         else
 909                 for (shared_ptr<Signal> s : signals_) {
 910                         if (!s->enabled())
 911                                 continue;
 912
 913                         list.emplace_back(s);
 914                 }
 915
 916         // Get data for listed signals
 917         for (entry_t &e : list) {
 918                 // Calculate sample number from cursor position
 919                 const double samples_per_pixel = e.signal->base()->get_samplerate() * scale();
 920                 const int64_t x_offset = offset().convert_to<double>() / scale();
 921                 const int64_t sample_num = max(((x_offset + p.x()) * samples_per_pixel), 0.0);
 922
 923                 vector<data::LogicSegment::EdgePair> edges =
 924                         e.signal->get_nearest_level_changes(sample_num);
 925
 926                 if (edges.empty())
 927                         continue;
 928
 929                 // Check first edge
 930                 const int64_t first_sample_delta = abs(sample_num - edges.front().first);
 931                 const int64_t first_delta = first_sample_delta / samples_per_pixel;
 932                 e.delta = first_delta;
 933                 e.sample = edges.front().first;
 934
 935                 // Check second edge if available
 936                 if (edges.size() == 2) {
 937                         // Note: -1 because this is usually the right edge and sample points are left-aligned
 938                         const int64_t second_sample_delta = abs(sample_num - edges.back().first - 1);
 939                         const int64_t second_delta = second_sample_delta / samples_per_pixel;
 940
 941                         // If both edges are too close, we mark this signal as being dense
 942                         if ((first_delta + second_delta) <= snap_distance_)
 943                                 e.is_dense = true;
 944
 945                         if (second_delta < first_delta) {
 946                                 e.delta = second_delta;
 947                                 e.sample = edges.back().first;
 948                         }
 949                 }
 950         }
 951
 952         // Look for the best match: non-dense first, then dense
 953         entry_t *match = nullptr;
 954
 955         for (entry_t &e : list) {
 956                 if (e.delta > snap_distance_ || e.is_dense)
 957                         continue;
 958
 959                 if (match) {
 960                         if (e.delta < match->delta)
 961                                 match = &e;
 962                 } else
 963                         match = &e;
 964         }
 965
 966         if (!match) {
 967                 for (entry_t &e : list) {
 968                         if (!e.is_dense)
 969                                 continue;
 970
 971                         if (match) {
 972                                 if (e.delta < match->delta)
 973                                         match = &e;
 974                         } else
 975                                 match = &e;
 976                 }
 977         }
 978
 979         if (match) {
 980                 // Somewhat ugly hack to make TimeItem::drag_by() work
 981                 signal_under_mouse_cursor_ = match->signal;
 982
 983                 return match->sample;
 984         }
 985
 986         return -1;
 987 }
 988
 989 void View::restack_all_trace_tree_items()
 990 {
 991         // Make a list of owners that is sorted from deepest first
 992         const vector<shared_ptr<TraceTreeItem>> items(
 993                 list_by_type<TraceTreeItem>());
 994         set< TraceTreeItemOwner* > owners;
 995         for (const auto &r : items)
 996                 owners.insert(r->owner());
 997         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 998         sort(sorted_owners.begin(), sorted_owners.end(),
 999                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
1000                         return a->depth() > b->depth(); });
1001
1002         // Restack the items recursively
1003         for (auto &o : sorted_owners)
1004                 o->restack_items();
1005
1006         // Animate the items to their destination
1007         for (const auto &i : items)
1008                 i->animate_to_layout_v_offset();
1009 }
1010
1011 int View::header_width() const
1012 {
1013          return header_->extended_size_hint().width();
1014 }
1015
1016 void View::on_setting_changed(const QString &key, const QVariant &value)
1017 {
1018         if (key == GlobalSettings::Key_View_TriggerIsZeroTime)
1019                 on_settingViewTriggerIsZeroTime_changed(value);
1020
1021         if (key == GlobalSettings::Key_View_SnapDistance) {
1022                 GlobalSettings settings;
1023                 snap_distance_ = settings.value(GlobalSettings::Key_View_SnapDistance).toInt();
1024         }
1025 }
1026
1027 void View::trigger_event(int segment_id, util::Timestamp location)
1028 {
1029         // TODO This doesn't work if we're showing multiple segments at once
1030         if ((uint32_t)segment_id != current_segment_)
1031                 return;
1032
1033         // Set zero location if the Key_View_TriggerIsZeroTime setting is set and
1034         // if this is the first trigger for this segment.
1035         GlobalSettings settings;
1036         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
1037
1038         size_t trigger_count = session_.get_triggers(current_segment_).size();
1039
1040         if (trigger_is_zero_time && trigger_count == 1)
1041                 set_zero_position(location);
1042
1043         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
1044 }
1045
1046 void View::get_scroll_layout(double &length, Timestamp &offset) const
1047 {
1048         const pair<Timestamp, Timestamp> extents = get_time_extents();
1049         length = ((extents.second - extents.first) / scale_).convert_to<double>();
1050         offset = offset_ / scale_;
1051 }
1052
1053 void View::set_zoom(double scale, int offset)
1054 {
1055         // Reset the "always zoom to fit" feature as the user changed the zoom
1056         always_zoom_to_fit_ = false;
1057         always_zoom_to_fit_changed(false);
1058
1059         const Timestamp cursor_offset = offset_ + scale_ * offset;
1060         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
1061         const Timestamp new_offset = cursor_offset - new_scale * offset;
1062         set_scale_offset(new_scale.convert_to<double>(), new_offset);
1063 }
1064
1065 void View::calculate_tick_spacing()
1066 {
1067         const double SpacingIncrement = 10.0f;
1068         const double MinValueSpacing = 40.0f;
1069
1070         // Figure out the highest numeric value visible on a label
1071         const QSize areaSize = viewport_->size();
1072         const Timestamp max_time = max(fabs(offset_),
1073                 fabs(offset_ + scale_ * areaSize.width()));
1074
1075         double min_width = SpacingIncrement;
1076         double label_width, tick_period_width;
1077
1078         QFontMetrics m(QApplication::font());
1079
1080         // Copies of the member variables with the same name, used in the calculation
1081         // and written back afterwards, so that we don't emit signals all the time
1082         // during the calculation.
1083         pv::util::Timestamp tick_period = tick_period_;
1084         pv::util::SIPrefix tick_prefix = tick_prefix_;
1085         unsigned tick_precision = tick_precision_;
1086
1087         do {
1088                 const double min_period = scale_ * min_width;
1089
1090                 const int order = (int)floorf(log10f(min_period));
1091                 const pv::util::Timestamp order_decimal =
1092                         pow(pv::util::Timestamp(10), order);
1093
1094                 // Allow for a margin of error so that a scale unit of 1 can be used.
1095                 // Otherwise, for a SU of 1 the tick period will almost always be below
1096                 // the min_period by a small amount - and thus skipped in favor of 2.
1097                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
1098                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
1099                 double tp_with_margin;
1100                 unsigned int unit = 0;
1101
1102                 do {
1103                         tp_with_margin = order_decimal.convert_to<double>() *
1104                                 (ScaleUnits[unit++] + tp_margin);
1105                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
1106
1107                 minor_tick_count_ = (unit == 2) ? 4 : 5;
1108                 tick_period = order_decimal * ScaleUnits[unit - 1];
1109                 tick_prefix = static_cast<pv::util::SIPrefix>(
1110                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
1111
1112                 // Precision is the number of fractional digits required, not
1113                 // taking the prefix into account (and it must never be negative)
1114                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
1115
1116                 tick_period_width = (tick_period / scale_).convert_to<double>();
1117
1118                 const QString label_text = Ruler::format_time_with_distance(
1119                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
1120
1121                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
1122                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
1123                                 MinValueSpacing;
1124
1125                 min_width += SpacingIncrement;
1126         } while (tick_period_width < label_width);
1127
1128         set_tick_period(tick_period);
1129         set_tick_prefix(tick_prefix);
1130         set_tick_precision(tick_precision);
1131 }
1132
1133 void View::adjust_top_margin()
1134 {
1135         assert(viewport_);
1136
1137         const QSize areaSize = viewport_->size();
1138
1139         const pair<int, int> extents = v_extents();
1140         const int top_margin = owner_visual_v_offset() + extents.first;
1141         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
1142
1143         // Do we have empty space at the top while the last trace goes out of screen?
1144         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
1145                 const int trace_height = extents.second - extents.first;
1146
1147                 // Center everything vertically if there is enough space
1148                 if (areaSize.height() >= trace_height)
1149                         set_v_offset(extents.first -
1150                                 ((areaSize.height() - trace_height) / 2));
1151                 else
1152                         // Remove the top margin to make as many traces fit on screen as possible
1153                         set_v_offset(extents.first);
1154         }
1155 }
1156
1157 void View::update_scroll()
1158 {
1159         assert(viewport_);
1160         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
1161         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
1162
1163         const QSize areaSize = viewport_->size();
1164
1165         // Set the horizontal scroll bar
1166         double length = 0;
1167         Timestamp offset;
1168         get_scroll_layout(length, offset);
1169         length = max(length - areaSize.width(), 0.0);
1170
1171         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
1172
1173         hscrollbar->setPageStep(areaSize.width() / 2);
1174         hscrollbar->setSingleStep(major_tick_distance);
1175
1176         updating_scroll_ = true;
1177
1178         if (length < MaxScrollValue) {
1179                 hscrollbar->setRange(0, length);
1180                 hscrollbar->setSliderPosition(offset.convert_to<double>());
1181         } else {
1182                 hscrollbar->setRange(0, MaxScrollValue);
1183                 hscrollbar->setSliderPosition(
1184                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
1185         }
1186
1187         updating_scroll_ = false;
1188
1189         // Set the vertical scrollbar
1190         vscrollbar->setPageStep(areaSize.height());
1191         vscrollbar->setSingleStep(areaSize.height() / 8);
1192
1193         const pair<int, int> extents = v_extents();
1194
1195         // Don't change the scrollbar range if there are no traces
1196         if (extents.first != extents.second)
1197                 vscrollbar->setRange(extents.first - areaSize.height(),
1198                         extents.second);
1199
1200         if (scroll_needs_defaults_) {
1201                 set_scroll_default();
1202                 scroll_needs_defaults_ = false;
1203         }
1204 }
1205
1206 void View::reset_scroll()
1207 {
1208         scrollarea_->verticalScrollBar()->setRange(0, 0);
1209 }
1210
1211 void View::set_scroll_default()
1212 {
1213         assert(viewport_);
1214
1215         const QSize areaSize = viewport_->size();
1216
1217         const pair<int, int> extents = v_extents();
1218         const int trace_height = extents.second - extents.first;
1219
1220         // Do all traces fit in the view?
1221         if (areaSize.height() >= trace_height)
1222                 // Center all traces vertically
1223                 set_v_offset(extents.first -
1224                         ((areaSize.height() - trace_height) / 2));
1225         else
1226                 // Put the first trace at the top, letting the bottom ones overflow
1227                 set_v_offset(extents.first);
1228 }
1229
1230 void View::determine_if_header_was_shrunk()
1231 {
1232         const int header_pane_width =
1233                 splitter_->sizes().front();  // clazy:exclude=detaching-temporary
1234
1235         // Allow for a slight margin of error so that we also accept
1236         // slight differences when e.g. a label name change increased
1237         // the overall width
1238         header_was_shrunk_ = (header_pane_width < (header_width() - 10));
1239 }
1240
1241 void View::resize_header_to_fit()
1242 {
1243         // Setting the maximum width of the header widget doesn't work as
1244         // expected because the splitter would allow the user to make the
1245         // pane wider than that, creating empty space as a result.
1246         // To make this work, we stricly enforce the maximum width by
1247         // expanding the header unless the user shrunk it on purpose.
1248         // As we're then setting the width of the header pane, we set the
1249         // splitter to the maximum allowed position.
1250
1251         int splitter_area_width = 0;
1252         for (int w : splitter_->sizes())  // clazy:exclude=range-loop
1253                 splitter_area_width += w;
1254
1255         // Make sure the header has enough horizontal space to show all labels fully
1256         QList<int> pane_sizes;
1257         pane_sizes.push_back(header_->extended_size_hint().width());
1258         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1259         splitter_->setSizes(pane_sizes);
1260 }
1261
1262 void View::update_layout()
1263 {
1264         update_scroll();
1265 }
1266
1267 TraceTreeItemOwner* View::find_prevalent_trace_group(
1268         const shared_ptr<sigrok::ChannelGroup> &group,
1269         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1270                 &signal_map)
1271 {
1272         assert(group);
1273
1274         unordered_set<TraceTreeItemOwner*> owners;
1275         vector<TraceTreeItemOwner*> owner_list;
1276
1277         // Make a set and a list of all the owners
1278         for (const auto& channel : group->channels()) {
1279                 for (auto& entry : signal_map) {
1280                         if (entry.first->channel() == channel) {
1281                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1282                                 owner_list.push_back(o);
1283                                 owners.insert(o);
1284                         }
1285                 }
1286         }
1287
1288         // Iterate through the list of owners, and find the most prevalent
1289         size_t max_prevalence = 0;
1290         TraceTreeItemOwner *prevalent_owner = nullptr;
1291         for (TraceTreeItemOwner *owner : owners) {
1292                 const size_t prevalence = count_if(
1293                         owner_list.begin(), owner_list.end(),
1294                         [&](TraceTreeItemOwner *o) { return o == owner; });
1295                 if (prevalence > max_prevalence) {
1296                         max_prevalence = prevalence;
1297                         prevalent_owner = owner;
1298                 }
1299         }
1300
1301         return prevalent_owner;
1302 }
1303
1304 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1305         const vector< shared_ptr<sigrok::Channel> > &channels,
1306         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1307                 &signal_map,
1308         set< shared_ptr<Trace> > &add_list)
1309 {
1310         vector< shared_ptr<Trace> > filtered_traces;
1311
1312         for (const auto& channel : channels) {
1313                 for (auto& entry : signal_map) {
1314                         if (entry.first->channel() == channel) {
1315                                 shared_ptr<Trace> trace = entry.second;
1316                                 const auto list_iter = add_list.find(trace);
1317                                 if (list_iter == add_list.end())
1318                                         continue;
1319
1320                                 filtered_traces.push_back(trace);
1321                                 add_list.erase(list_iter);
1322                         }
1323                 }
1324         }
1325
1326         return filtered_traces;
1327 }
1328
1329 void View::determine_time_unit()
1330 {
1331         // Check whether we know the sample rate and hence can use time as the unit
1332         if (time_unit_ == util::TimeUnit::Samples) {
1333                 // Check all signals but...
1334                 for (const shared_ptr<Signal>& signal : signals_) {
1335                         const shared_ptr<SignalData> data = signal->data();
1336
1337                         // ...only check first segment of each
1338                         const vector< shared_ptr<Segment> > segments = data->segments();
1339                         if (!segments.empty())
1340                                 if (segments[0]->samplerate()) {
1341                                         set_time_unit(util::TimeUnit::Time);
1342                                         break;
1343                                 }
1344                 }
1345         }
1346 }
1347
1348 bool View::eventFilter(QObject *object, QEvent *event)
1349 {
1350         const QEvent::Type type = event->type();
1351         if (type == QEvent::MouseMove) {
1352
1353                 if (object)
1354                         hover_widget_ = qobject_cast<QWidget*>(object);
1355
1356                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1357                 if (object == viewport_)
1358                         hover_point_ = mouse_event->pos();
1359                 else if (object == ruler_)
1360                         hover_point_ = mouse_event->pos();
1361                 else if (object == header_)
1362                         hover_point_ = QPoint(0, mouse_event->y());
1363                 else
1364                         hover_point_ = QPoint(-1, -1);
1365
1366                 update_hover_point();
1367
1368         } else if (type == QEvent::Leave) {
1369                 hover_point_ = QPoint(-1, -1);
1370                 update_hover_point();
1371         } else if (type == QEvent::Show) {
1372
1373                 // This is somewhat of a hack, unfortunately. We cannot use
1374                 // set_v_offset() from within restore_settings() as the view
1375                 // at that point is neither visible nor properly sized.
1376                 // This is the least intrusive workaround I could come up
1377                 // with: set the vertical offset (or scroll defaults) when
1378                 // the view is shown, which happens after all widgets were
1379                 // resized to their final sizes.
1380                 update_layout();
1381
1382                 if (settings_restored_)
1383                         determine_if_header_was_shrunk();
1384                 else
1385                         resize_header_to_fit();
1386
1387                 if (scroll_needs_defaults_) {
1388                         set_scroll_default();
1389                         scroll_needs_defaults_ = false;
1390                 }
1391
1392                 if (saved_v_offset_) {
1393                         set_v_offset(saved_v_offset_);
1394                         saved_v_offset_ = 0;
1395                 }
1396         }
1397
1398         return QObject::eventFilter(object, event);
1399 }
1400
1401 void View::contextMenuEvent(QContextMenuEvent *event)
1402 {
1403         QPoint pos = event->pos() - QPoint(0, ruler_->sizeHint().height());
1404
1405         const shared_ptr<ViewItem> r = viewport_->get_mouse_over_item(pos);
1406         if (!r)
1407                 return;
1408
1409         QMenu *menu = r->create_view_context_menu(this, pos);
1410         if (menu)
1411                 menu->popup(event->globalPos());
1412 }
1413
1414 void View::resizeEvent(QResizeEvent* event)
1415 {
1416         // Only adjust the top margin if we shrunk vertically
1417         if (event->size().height() < event->oldSize().height())
1418                 adjust_top_margin();
1419
1420         update_layout();
1421 }
1422
1423 void View::update_hover_point()
1424 {
1425         // Determine signal that the mouse cursor is hovering over
1426         signal_under_mouse_cursor_.reset();
1427         if (hover_widget_ == this) {
1428                 for (const shared_ptr<Signal>& s : signals_) {
1429                         const pair<int, int> extents = s->v_extents();
1430                         const int top = s->get_visual_y() + extents.first;
1431                         const int btm = s->get_visual_y() + extents.second;
1432                         if ((hover_point_.y() >= top) && (hover_point_.y() <= btm)
1433                                 && s->base()->enabled())
1434                                 signal_under_mouse_cursor_ = s;
1435                 }
1436         }
1437
1438         // Update all trace tree items
1439         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1440                 list_by_type<TraceTreeItem>());
1441         for (const shared_ptr<TraceTreeItem>& r : trace_tree_items)
1442                 r->hover_point_changed(hover_point_);
1443
1444         // Notify any other listeners
1445         hover_point_changed(hover_widget_, hover_point_);
1446 }
1447
1448 void View::row_item_appearance_changed(bool label, bool content)
1449 {
1450         if (label)
1451                 header_->update();
1452         if (content)
1453                 viewport_->update();
1454 }
1455
1456 void View::time_item_appearance_changed(bool label, bool content)
1457 {
1458         if (label) {
1459                 ruler_->update();
1460
1461                 // Make sure the header pane width is updated, too
1462                 update_layout();
1463         }
1464
1465         if (content)
1466                 viewport_->update();
1467 }
1468
1469 void View::extents_changed(bool horz, bool vert)
1470 {
1471         sticky_events_ |=
1472                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1473                 (vert ? TraceTreeItemVExtentsChanged : 0);
1474
1475         lazy_event_handler_.stop();
1476         lazy_event_handler_.start();
1477 }
1478
1479 void View::on_signal_name_changed()
1480 {
1481         if (!header_was_shrunk_)
1482                 resize_header_to_fit();
1483 }
1484
1485 void View::on_splitter_moved()
1486 {
1487         // The header can only shrink when the splitter is moved manually
1488         determine_if_header_was_shrunk();
1489
1490         if (!header_was_shrunk_)
1491                 resize_header_to_fit();
1492 }
1493
1494 void View::h_scroll_value_changed(int value)
1495 {
1496         if (updating_scroll_)
1497                 return;
1498
1499         // Disable sticky scrolling when user moves the horizontal scroll bar
1500         // during a running acquisition
1501         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1502                 sticky_scrolling_ = false;
1503                 sticky_scrolling_changed(false);
1504         }
1505
1506         const int range = scrollarea_->horizontalScrollBar()->maximum();
1507         if (range < MaxScrollValue)
1508                 set_offset(scale_ * value);
1509         else {
1510                 double length = 0;
1511                 Timestamp offset;
1512                 get_scroll_layout(length, offset);
1513                 set_offset(scale_ * length * value / MaxScrollValue);
1514         }
1515
1516         ruler_->update();
1517         viewport_->update();
1518 }
1519
1520 void View::v_scroll_value_changed()
1521 {
1522         header_->update();
1523         viewport_->update();
1524 }
1525
1526 void View::signals_changed()
1527 {
1528         using sigrok::Channel;
1529
1530         vector< shared_ptr<Channel> > channels;
1531         shared_ptr<sigrok::Device> sr_dev;
1532         bool signals_added_or_removed = false;
1533
1534         // Do we need to set the vertical scrollbar to its default position later?
1535         // We do if there are no traces, i.e. the scroll bar has no range set
1536         bool reset_scrollbar =
1537                 (scrollarea_->verticalScrollBar()->minimum() ==
1538                         scrollarea_->verticalScrollBar()->maximum());
1539
1540         if (!session_.device()) {
1541                 reset_scroll();
1542                 signals_.clear();
1543         } else {
1544                 sr_dev = session_.device()->device();
1545                 assert(sr_dev);
1546                 channels = sr_dev->channels();
1547         }
1548
1549         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1550
1551         // Make a list of traces that are being added, and a list of traces
1552         // that are being removed
1553         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1554         const set<shared_ptr<Trace>> prev_traces(
1555                 prev_trace_list.begin(), prev_trace_list.end());
1556
1557         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1558
1559 #ifdef ENABLE_DECODE
1560         traces.insert(decode_traces_.begin(), decode_traces_.end());
1561 #endif
1562
1563         set< shared_ptr<Trace> > add_traces;
1564         set_difference(traces.begin(), traces.end(),
1565                 prev_traces.begin(), prev_traces.end(),
1566                 inserter(add_traces, add_traces.begin()));
1567
1568         set< shared_ptr<Trace> > remove_traces;
1569         set_difference(prev_traces.begin(), prev_traces.end(),
1570                 traces.begin(), traces.end(),
1571                 inserter(remove_traces, remove_traces.begin()));
1572
1573         // Make a look-up table of sigrok Channels to pulseview Signals
1574         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1575                 signal_map;
1576         for (const shared_ptr<Signal>& sig : signals_)
1577                 signal_map[sig->base()] = sig;
1578
1579         // Populate channel groups
1580         if (sr_dev)
1581                 for (auto& entry : sr_dev->channel_groups()) {
1582                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1583
1584                         if (group->channels().size() <= 1)
1585                                 continue;
1586
1587                         // Find best trace group to add to
1588                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1589                                 group, signal_map);
1590
1591                         // If there is no trace group, create one
1592                         shared_ptr<TraceGroup> new_trace_group;
1593                         if (!owner) {
1594                                 new_trace_group.reset(new TraceGroup());
1595                                 owner = new_trace_group.get();
1596                         }
1597
1598                         // Extract traces for the trace group, removing them from
1599                         // the add list
1600                         const vector< shared_ptr<Trace> > new_traces_in_group =
1601                                 extract_new_traces_for_channels(group->channels(),
1602                                         signal_map, add_traces);
1603
1604                         // Add the traces to the group
1605                         const pair<int, int> prev_v_extents = owner->v_extents();
1606                         int offset = prev_v_extents.second - prev_v_extents.first;
1607                         for (const shared_ptr<Trace>& trace : new_traces_in_group) {
1608                                 assert(trace);
1609                                 owner->add_child_item(trace);
1610
1611                                 const pair<int, int> extents = trace->v_extents();
1612                                 if (trace->enabled())
1613                                         offset += -extents.first;
1614                                 trace->force_to_v_offset(offset);
1615                                 if (trace->enabled())
1616                                         offset += extents.second;
1617                         }
1618
1619                         if (new_trace_group) {
1620                                 // Assign proper vertical offsets to each channel in the group
1621                                 new_trace_group->restack_items();
1622
1623                                 // If this is a new group, enqueue it in the new top level
1624                                 // items list
1625                                 if (!new_traces_in_group.empty())
1626                                         new_top_level_items.push_back(new_trace_group);
1627                         }
1628                 }
1629
1630         // Enqueue the remaining logic channels in a group
1631         vector< shared_ptr<Channel> > logic_channels;
1632         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1633                 [](const shared_ptr<Channel>& c) {
1634                         return c->type() == sigrok::ChannelType::LOGIC; });
1635
1636         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1637                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1638
1639         if (non_grouped_logic_signals.size() > 0) {
1640                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1641                         make_shared<TraceGroup>());
1642                 for (const shared_ptr<Trace>& trace : non_grouped_logic_signals)
1643                         non_grouped_trace_group->add_child_item(trace);
1644
1645                 non_grouped_trace_group->restack_items();
1646                 new_top_level_items.push_back(non_grouped_trace_group);
1647         }
1648
1649         // Enqueue the remaining channels as free ungrouped traces
1650         const vector< shared_ptr<Trace> > new_top_level_signals =
1651                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1652         new_top_level_items.insert(new_top_level_items.end(),
1653                 new_top_level_signals.begin(), new_top_level_signals.end());
1654
1655         // Enqueue any remaining traces i.e. decode traces
1656         new_top_level_items.insert(new_top_level_items.end(),
1657                 add_traces.begin(), add_traces.end());
1658
1659         // Remove any removed traces
1660         for (const shared_ptr<Trace>& trace : remove_traces) {
1661                 TraceTreeItemOwner *const owner = trace->owner();
1662                 assert(owner);
1663                 owner->remove_child_item(trace);
1664                 signals_added_or_removed = true;
1665         }
1666
1667         // Remove any empty trace groups
1668         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1669                 if (group->child_items().size() == 0) {
1670                         remove_child_item(group);
1671                         group.reset();
1672                 }
1673
1674         // Add and position the pending top levels items
1675         int offset = v_extents().second;
1676         for (auto item : new_top_level_items) {
1677                 add_child_item(item);
1678
1679                 // Position the item after the last item or at the top if there is none
1680                 const pair<int, int> extents = item->v_extents();
1681
1682                 if (item->enabled())
1683                         offset += -extents.first;
1684
1685                 item->force_to_v_offset(offset);
1686
1687                 if (item->enabled())
1688                         offset += extents.second;
1689                 signals_added_or_removed = true;
1690         }
1691
1692
1693         if (signals_added_or_removed && !header_was_shrunk_)
1694                 resize_header_to_fit();
1695
1696         update_layout();
1697
1698         header_->update();
1699         viewport_->update();
1700
1701         if (reset_scrollbar)
1702                 set_scroll_default();
1703 }
1704
1705 void View::capture_state_updated(int state)
1706 {
1707         GlobalSettings settings;
1708
1709         if (state == Session::Running) {
1710                 set_time_unit(util::TimeUnit::Samples);
1711
1712                 trigger_markers_.clear();
1713                 set_zero_position(0);
1714
1715                 scale_at_acq_start_ = scale_;
1716                 offset_at_acq_start_ = offset_;
1717
1718                 // Activate "always zoom to fit" if the setting is enabled and we're
1719                 // the main view of this session (other trace views may be used for
1720                 // zooming and we don't want to mess them up)
1721                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1722                 if (is_main_view_ && state) {
1723                         always_zoom_to_fit_ = true;
1724                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1725                 }
1726
1727                 // Enable sticky scrolling if the setting is enabled
1728                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1729
1730                 // Reset all traces to segment 0
1731                 current_segment_ = 0;
1732                 set_current_segment(current_segment_);
1733         }
1734
1735         if (state == Session::Stopped) {
1736                 // After acquisition has stopped we need to re-calculate the ticks once
1737                 // as it's otherwise done when the user pans or zooms, which is too late
1738                 calculate_tick_spacing();
1739
1740                 // Reset "always zoom to fit", the acquisition has stopped
1741                 if (always_zoom_to_fit_) {
1742                         // Perform a final zoom-to-fit before disabling
1743                         zoom_fit(always_zoom_to_fit_);
1744                         always_zoom_to_fit_ = false;
1745                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1746                 }
1747
1748                 bool zoom_to_fit_after_acq =
1749                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1750
1751                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1752                 // we didn't restore settings in the meanwhile
1753                 if (zoom_to_fit_after_acq &&
1754                         !suppress_zoom_to_fit_after_acq_ &&
1755                         (scale_ == scale_at_acq_start_) &&
1756                         (offset_ == offset_at_acq_start_))
1757                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1758
1759                 suppress_zoom_to_fit_after_acq_ = false;
1760         }
1761 }
1762
1763 void View::on_new_segment(int new_segment_id)
1764 {
1765         on_segment_changed(new_segment_id);
1766 }
1767
1768 void View::on_segment_completed(int segment_id)
1769 {
1770         on_segment_changed(segment_id);
1771 }
1772
1773 void View::on_segment_changed(int segment)
1774 {
1775         switch (segment_display_mode_) {
1776         case Trace::ShowLastSegmentOnly:
1777         case Trace::ShowSingleSegmentOnly:
1778                 set_current_segment(segment);
1779                 break;
1780
1781         case Trace::ShowLastCompleteSegmentOnly:
1782                 // Only update if all segments are complete
1783                 if (session_.all_segments_complete(segment))
1784                         set_current_segment(segment);
1785                 break;
1786
1787         case Trace::ShowAllSegments:
1788         case Trace::ShowAccumulatedIntensity:
1789         default:
1790                 break;
1791         }
1792 }
1793
1794 void View::on_settingViewTriggerIsZeroTime_changed(const QVariant new_value)
1795 {
1796         if (new_value.toBool()) {
1797                 // The first trigger for this segment is used as the zero position
1798                 vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
1799                 if (triggers.size() > 0)
1800                         set_zero_position(triggers.front());
1801         } else
1802                 reset_zero_position();
1803 }
1804
1805 void View::perform_delayed_view_update()
1806 {
1807         if (always_zoom_to_fit_) {
1808                 zoom_fit(true);
1809         } else if (sticky_scrolling_) {
1810                 // Make right side of the view sticky
1811                 double length = 0;
1812                 Timestamp offset;
1813                 get_scroll_layout(length, offset);
1814
1815                 const QSize areaSize = viewport_->size();
1816                 length = max(length - areaSize.width(), 0.0);
1817
1818                 set_offset(scale_ * length);
1819         }
1820
1821         determine_time_unit();
1822         update_scroll();
1823         ruler_->update();
1824         viewport_->update();
1825 }
1826
1827 void View::process_sticky_events()
1828 {
1829         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1830                 update_layout();
1831         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1832                 restack_all_trace_tree_items();
1833                 update_scroll();
1834         }
1835
1836         // Clear the sticky events
1837         sticky_events_ = 0;
1838 }
1839
1840 } // namespace trace
1841 } // namespace views
1842 } // namespace pv