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