pv/views/trace/view.cpp

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