pv/view/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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #ifdef ENABLE_DECODE
  22 #include <libsigrokdecode/libsigrokdecode.h>
  23 #endif
  24
  25 #include <extdef.h>
  26
  27 #include <algorithm>
  28 #include <cassert>
  29 #include <climits>
  30 #include <cmath>
  31 #include <iterator>
  32 #include <mutex>
  33 #include <unordered_set>
  34
  35 #include <QApplication>
  36 #include <QEvent>
  37 #include <QFontMetrics>
  38 #include <QMouseEvent>
  39 #include <QScrollBar>
  40
  41 #include <libsigrokcxx/libsigrokcxx.hpp>
  42
  43 #include "decodetrace.hpp"
  44 #include "header.hpp"
  45 #include "logicsignal.hpp"
  46 #include "ruler.hpp"
  47 #include "signal.hpp"
  48 #include "tracegroup.hpp"
  49 #include "view.hpp"
  50 #include "viewport.hpp"
  51
  52 #include "pv/session.hpp"
  53 #include "pv/devices/device.hpp"
  54 #include "pv/data/logic.hpp"
  55 #include "pv/data/logicsegment.hpp"
  56 #include "pv/util.hpp"
  57
  58 using boost::shared_lock;
  59 using boost::shared_mutex;
  60
  61 using pv::data::SignalData;
  62 using pv::data::Segment;
  63 using pv::util::format_time;
  64
  65 using std::deque;
  66 using std::dynamic_pointer_cast;
  67 using std::inserter;
  68 using std::list;
  69 using std::lock_guard;
  70 using std::max;
  71 using std::make_pair;
  72 using std::min;
  73 using std::pair;
  74 using std::set;
  75 using std::set_difference;
  76 using std::shared_ptr;
  77 using std::unordered_map;
  78 using std::unordered_set;
  79 using std::vector;
  80 using std::weak_ptr;
  81
  82 namespace pv {
  83 namespace view {
  84
  85 const double View::MaxScale = 1e9;
  86 const double View::MinScale = 1e-15;
  87
  88 const int View::MaxScrollValue = INT_MAX / 2;
  89 const int View::MaxViewAutoUpdateRate = 25; // No more than 25 Hz with sticky scrolling
  90
  91 const int View::ScaleUnits[3] = {1, 2, 5};
  92
  93 View::View(Session &session, QWidget *parent) :
  94         QAbstractScrollArea(parent),
  95         session_(session),
  96         viewport_(new Viewport(*this)),
  97         ruler_(new Ruler(*this)),
  98         header_(new Header(*this)),
  99         scale_(1e-3),
 100         offset_(0),
 101         updating_scroll_(false),
 102         sticky_scrolling_(false), // Default setting is set in MainWindow::setup_ui()
 103         always_zoom_to_fit_(false),
 104         tick_period_(0.0),
 105         tick_prefix_(0),
 106         show_cursors_(false),
 107         cursors_(new CursorPair(*this)),
 108         next_flag_text_('A'),
 109         hover_point_(-1, -1)
 110 {
 111         connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
 112                 this, SLOT(h_scroll_value_changed(int)));
 113         connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 114                 this, SLOT(v_scroll_value_changed()));
 115
 116         connect(&session_, SIGNAL(signals_changed()),
 117                 this, SLOT(signals_changed()));
 118         connect(&session_, SIGNAL(capture_state_changed(int)),
 119                 this, SLOT(data_updated()));
 120         connect(&session_, SIGNAL(data_received()),
 121                 this, SLOT(data_updated()));
 122         connect(&session_, SIGNAL(frame_ended()),
 123                 this, SLOT(data_updated()));
 124
 125         connect(header_, SIGNAL(selection_changed()),
 126                 ruler_, SLOT(clear_selection()));
 127         connect(ruler_, SIGNAL(selection_changed()),
 128                 header_, SLOT(clear_selection()));
 129
 130         connect(header_, SIGNAL(selection_changed()),
 131                 this, SIGNAL(selection_changed()));
 132         connect(ruler_, SIGNAL(selection_changed()),
 133                 this, SIGNAL(selection_changed()));
 134
 135         connect(this, SIGNAL(hover_point_changed()),
 136                 this, SLOT(on_hover_point_changed()));
 137
 138         connect(&lazy_event_handler_, SIGNAL(timeout()),
 139                 this, SLOT(process_sticky_events()));
 140         lazy_event_handler_.setSingleShot(true);
 141
 142         connect(&delayed_view_updater_, SIGNAL(timeout()),
 143                 this, SLOT(perform_delayed_view_update()));
 144         delayed_view_updater_.setSingleShot(true);
 145         delayed_view_updater_.setInterval(1000 / MaxViewAutoUpdateRate);
 146
 147         setViewport(viewport_);
 148
 149         viewport_->installEventFilter(this);
 150         ruler_->installEventFilter(this);
 151         header_->installEventFilter(this);
 152
 153         // Trigger the initial event manually. The default device has signals
 154         // which were created before this object came into being
 155         signals_changed();
 156
 157         // make sure the transparent widgets are on the top
 158         ruler_->raise();
 159         header_->raise();
 160
 161         // Update the zoom state
 162         calculate_tick_spacing();
 163 }
 164
 165 Session& View::session()
 166 {
 167         return session_;
 168 }
 169
 170 const Session& View::session() const
 171 {
 172         return session_;
 173 }
 174
 175 View* View::view()
 176 {
 177         return this;
 178 }
 179
 180 const View* View::view() const
 181 {
 182         return this;
 183 }
 184
 185 Viewport* View::viewport()
 186 {
 187         return viewport_;
 188 }
 189
 190 const Viewport* View::viewport() const
 191 {
 192         return viewport_;
 193 }
 194
 195 vector< shared_ptr<TimeItem> > View::time_items() const
 196 {
 197         const vector<shared_ptr<Flag>> f(flags());
 198         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 199         items.push_back(cursors_);
 200         items.push_back(cursors_->first());
 201         items.push_back(cursors_->second());
 202         return items;
 203 }
 204
 205 double View::scale() const
 206 {
 207         return scale_;
 208 }
 209
 210 double View::offset() const
 211 {
 212         return offset_;
 213 }
 214
 215 int View::owner_visual_v_offset() const
 216 {
 217         return -verticalScrollBar()->sliderPosition();
 218 }
 219
 220 void View::set_v_offset(int offset)
 221 {
 222         verticalScrollBar()->setSliderPosition(offset);
 223         header_->update();
 224         viewport_->update();
 225 }
 226
 227 unsigned int View::depth() const
 228 {
 229         return 0;
 230 }
 231
 232 unsigned int View::tick_prefix() const
 233 {
 234         return tick_prefix_;
 235 }
 236
 237 double View::tick_period() const
 238 {
 239         return tick_period_;
 240 }
 241
 242 void View::zoom(double steps)
 243 {
 244         zoom(steps, viewport_->width() / 2);
 245 }
 246
 247 void View::zoom(double steps, int offset)
 248 {
 249         set_zoom(scale_ * pow(3.0/2.0, -steps), offset);
 250 }
 251
 252 void View::zoom_fit(bool gui_state)
 253 {
 254         // Act as one-shot when stopped, toggle along with the GUI otherwise
 255         if (session_.get_capture_state() == Session::Stopped) {
 256                 always_zoom_to_fit_ = false;
 257                 always_zoom_to_fit_changed(false);
 258         } else {
 259                 always_zoom_to_fit_ = gui_state;
 260                 always_zoom_to_fit_changed(gui_state);
 261         }
 262
 263         const pair<double, double> extents = get_time_extents();
 264         const double delta = extents.second - extents.first;
 265         if (delta < 1e-12)
 266                 return;
 267
 268         assert(viewport_);
 269         const int w = viewport_->width();
 270         if (w <= 0)
 271                 return;
 272
 273         const double scale = max(min(delta / w, MaxScale), MinScale);
 274         set_scale_offset(scale, extents.first);
 275 }
 276
 277 void View::zoom_one_to_one()
 278 {
 279         using pv::data::SignalData;
 280
 281         // Make a set of all the visible data objects
 282         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 283         if (visible_data.empty())
 284                 return;
 285
 286         double samplerate = 0.0;
 287         for (const shared_ptr<SignalData> d : visible_data) {
 288                 assert(d);
 289                 const vector< shared_ptr<Segment> > segments =
 290                         d->segments();
 291                 for (const shared_ptr<Segment> &s : segments)
 292                         samplerate = max(samplerate, s->samplerate());
 293         }
 294
 295         if (samplerate == 0.0)
 296                 return;
 297
 298         assert(viewport_);
 299         const int w = viewport_->width();
 300         if (w <= 0)
 301                 return;
 302
 303         set_zoom(1.0 / samplerate, w / 2);
 304 }
 305
 306 void View::set_scale_offset(double scale, double offset)
 307 {
 308         // Disable sticky scrolling / always zoom to fit when acquisition runs
 309         // and user drags the viewport
 310         if ((scale_ == scale) && (offset_ != offset) &&
 311                         (session_.get_capture_state() == Session::Running)) {
 312
 313                 if (sticky_scrolling_) {
 314                         sticky_scrolling_ = false;
 315                         sticky_scrolling_changed(false);
 316                 }
 317
 318                 if (always_zoom_to_fit_) {
 319                         always_zoom_to_fit_ = false;
 320                         always_zoom_to_fit_changed(false);
 321                 }
 322         }
 323
 324         scale_ = scale;
 325         offset_ = offset;
 326
 327         calculate_tick_spacing();
 328
 329         update_scroll();
 330         ruler_->update();
 331         viewport_->update();
 332         scale_offset_changed();
 333 }
 334
 335 set< shared_ptr<SignalData> > View::get_visible_data() const
 336 {
 337         shared_lock<shared_mutex> lock(session().signals_mutex());
 338         const unordered_set< shared_ptr<Signal> > &sigs(session().signals());
 339
 340         // Make a set of all the visible data objects
 341         set< shared_ptr<SignalData> > visible_data;
 342         for (const shared_ptr<Signal> sig : sigs)
 343                 if (sig->enabled())
 344                         visible_data.insert(sig->data());
 345
 346         return visible_data;
 347 }
 348
 349 pair<double, double> View::get_time_extents() const
 350 {
 351         double left_time = DBL_MAX, right_time = DBL_MIN;
 352         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 353         for (const shared_ptr<SignalData> d : visible_data)
 354         {
 355                 const vector< shared_ptr<Segment> > segments =
 356                         d->segments();
 357                 for (const shared_ptr<Segment> &s : segments) {
 358                         double samplerate = s->samplerate();
 359                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 360
 361                         const double start_time = s->start_time();
 362                         left_time = min(left_time, start_time);
 363                         right_time = max(right_time, start_time +
 364                                 d->max_sample_count() / samplerate);
 365                 }
 366         }
 367
 368         if (left_time == DBL_MAX && right_time == DBL_MIN)
 369                 return make_pair(0.0, 0.0);
 370
 371         assert(left_time < right_time);
 372         return make_pair(left_time, right_time);
 373 }
 374
 375 void View::enable_sticky_scrolling(bool state)
 376 {
 377         sticky_scrolling_ = state;
 378 }
 379
 380 bool View::cursors_shown() const
 381 {
 382         return show_cursors_;
 383 }
 384
 385 void View::show_cursors(bool show)
 386 {
 387         show_cursors_ = show;
 388         ruler_->update();
 389         viewport_->update();
 390 }
 391
 392 void View::centre_cursors()
 393 {
 394         const double time_width = scale_ * viewport_->width();
 395         cursors_->first()->set_time(offset_ + time_width * 0.4);
 396         cursors_->second()->set_time(offset_ + time_width * 0.6);
 397         ruler_->update();
 398         viewport_->update();
 399 }
 400
 401 std::shared_ptr<CursorPair> View::cursors() const
 402 {
 403         return cursors_;
 404 }
 405
 406 void View::add_flag(double time)
 407 {
 408         flags_.push_back(shared_ptr<Flag>(new Flag(*this, time,
 409                 QString("%1").arg(next_flag_text_))));
 410         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 411                 (next_flag_text_ + 1);
 412         time_item_appearance_changed(true, true);
 413 }
 414
 415 void View::remove_flag(std::shared_ptr<Flag> flag)
 416 {
 417         flags_.remove(flag);
 418         time_item_appearance_changed(true, true);
 419 }
 420
 421 vector< std::shared_ptr<Flag> > View::flags() const
 422 {
 423         vector< std::shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 424         stable_sort(flags.begin(), flags.end(),
 425                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 426                         return a->time() < b->time();
 427                 });
 428
 429         return flags;
 430 }
 431
 432 const QPoint& View::hover_point() const
 433 {
 434         return hover_point_;
 435 }
 436
 437 void View::update_viewport()
 438 {
 439         assert(viewport_);
 440         viewport_->update();
 441         header_->update();
 442 }
 443
 444 void View::restack_all_row_items()
 445 {
 446         // Make a list of owners that is sorted from deepest first
 447         const auto owners = list_row_item_owners();
 448         vector< RowItemOwner* > sorted_owners(owners.begin(), owners.end());
 449         sort(sorted_owners.begin(), sorted_owners.end(),
 450                 [](const RowItemOwner* a, const RowItemOwner *b) {
 451                         return a->depth() > b->depth(); });
 452
 453         // Restack the items recursively
 454         for (auto &o : sorted_owners)
 455                 o->restack_items();
 456
 457         // Animate the items to their destination
 458         for (const auto &r : *this)
 459                 r->animate_to_layout_v_offset();
 460 }
 461
 462 void View::get_scroll_layout(double &length, double &offset) const
 463 {
 464         const pair<double, double> extents = get_time_extents();
 465         length = (extents.second - extents.first) / scale_;
 466         offset = offset_ / scale_;
 467 }
 468
 469 void View::set_zoom(double scale, int offset)
 470 {
 471         // Reset the "always zoom to fit" feature as the user changed the zoom
 472         always_zoom_to_fit_ = false;
 473         always_zoom_to_fit_changed(false);
 474
 475         const double cursor_offset = offset_ + scale_ * offset;
 476         const double new_scale = max(min(scale, MaxScale), MinScale);
 477         const double new_offset = cursor_offset - new_scale * offset;
 478         set_scale_offset(new_scale, new_offset);
 479 }
 480
 481 void View::calculate_tick_spacing()
 482 {
 483         const double SpacingIncrement = 32.0f;
 484         const double MinValueSpacing = 32.0f;
 485
 486         double min_width = SpacingIncrement, typical_width;
 487
 488         QFontMetrics m(QApplication::font());
 489
 490         do {
 491                 const double min_period = scale_ * min_width;
 492
 493                 const int order = (int)floorf(log10f(min_period));
 494                 const double order_decimal = pow(10.0, order);
 495
 496                 unsigned int unit = 0;
 497
 498                 do {
 499                         tick_period_ = order_decimal * ScaleUnits[unit++];
 500                 } while (tick_period_ < min_period &&
 501                         unit < countof(ScaleUnits));
 502
 503                 tick_prefix_ = (order - pv::util::FirstSIPrefixPower) / 3;
 504
 505                 typical_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 506                         Qt::AlignLeft | Qt::AlignTop,
 507                         format_time(offset_, tick_prefix_)).width() +
 508                                 MinValueSpacing;
 509
 510                 min_width += SpacingIncrement;
 511
 512         } while(typical_width > tick_period_ / scale_);
 513 }
 514
 515 void View::update_scroll()
 516 {
 517         assert(viewport_);
 518
 519         const QSize areaSize = viewport_->size();
 520
 521         // Set the horizontal scroll bar
 522         double length = 0, offset = 0;
 523         get_scroll_layout(length, offset);
 524         length = max(length - areaSize.width(), 0.0);
 525
 526         int major_tick_distance = tick_period_ / scale_;
 527
 528         horizontalScrollBar()->setPageStep(areaSize.width() / 2);
 529         horizontalScrollBar()->setSingleStep(major_tick_distance);
 530
 531         updating_scroll_ = true;
 532
 533         if (length < MaxScrollValue) {
 534                 horizontalScrollBar()->setRange(0, length);
 535                 horizontalScrollBar()->setSliderPosition(offset);
 536         } else {
 537                 horizontalScrollBar()->setRange(0, MaxScrollValue);
 538                 horizontalScrollBar()->setSliderPosition(
 539                         offset_ * MaxScrollValue / (scale_ * length));
 540         }
 541
 542         updating_scroll_ = false;
 543
 544         // Set the vertical scrollbar
 545         verticalScrollBar()->setPageStep(areaSize.height());
 546         verticalScrollBar()->setSingleStep(areaSize.height() / 8);
 547
 548         const pair<int, int> extents = v_extents();
 549         verticalScrollBar()->setRange(extents.first - (areaSize.height() / 2),
 550                 extents.second - (areaSize.height() / 2));
 551 }
 552
 553 void View::update_layout()
 554 {
 555         setViewportMargins(
 556                 header_->sizeHint().width() - pv::view::Header::BaselineOffset,
 557                 ruler_->sizeHint().height(), 0, 0);
 558         ruler_->setGeometry(viewport_->x(), 0,
 559                 viewport_->width(), ruler_->extended_size_hint().height());
 560         header_->setGeometry(0, viewport_->y(),
 561                 header_->extended_size_hint().width(), viewport_->height());
 562         update_scroll();
 563 }
 564
 565 void View::paint_label(QPainter &p, const QRect &rect, bool hover)
 566 {
 567         (void)p;
 568         (void)rect;
 569         (void)hover;
 570 }
 571
 572 QRectF View::label_rect(const QRectF &rect)
 573 {
 574         (void)rect;
 575         return QRectF();
 576 }
 577
 578 RowItemOwner* View::find_prevalent_trace_group(
 579         const shared_ptr<sigrok::ChannelGroup> &group,
 580         const unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 581                 &signal_map)
 582 {
 583         assert(group);
 584
 585         unordered_set<RowItemOwner*> owners;
 586         vector<RowItemOwner*> owner_list;
 587
 588         // Make a set and a list of all the owners
 589         for (const auto &channel : group->channels()) {
 590                 const auto iter = signal_map.find(channel);
 591                 if (iter == signal_map.end())
 592                         continue;
 593
 594                 RowItemOwner *const o = (*iter).second->owner();
 595                 owner_list.push_back(o);
 596                 owners.insert(o);
 597         }
 598
 599         // Iterate through the list of owners, and find the most prevalent
 600         size_t max_prevalence = 0;
 601         RowItemOwner *prevalent_owner = nullptr;
 602         for (RowItemOwner *owner : owners) {
 603                 const size_t prevalence = std::count_if(
 604                         owner_list.begin(), owner_list.end(),
 605                         [&](RowItemOwner *o) { return o == owner; });
 606                 if (prevalence > max_prevalence) {
 607                         max_prevalence = prevalence;
 608                         prevalent_owner = owner;
 609                 }
 610         }
 611
 612         return prevalent_owner;
 613 }
 614
 615 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
 616         const vector< shared_ptr<sigrok::Channel> > &channels,
 617         const unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 618                 &signal_map,
 619         set< shared_ptr<Trace> > &add_list)
 620 {
 621         vector< shared_ptr<Trace> > filtered_traces;
 622
 623         for (const auto &channel : channels)
 624         {
 625                 const auto map_iter = signal_map.find(channel);
 626                 if (map_iter == signal_map.end())
 627                         continue;
 628
 629                 shared_ptr<Trace> trace = (*map_iter).second;
 630                 const auto list_iter = add_list.find(trace);
 631                 if (list_iter == add_list.end())
 632                         continue;
 633
 634                 filtered_traces.push_back(trace);
 635                 add_list.erase(list_iter);
 636         }
 637
 638         return filtered_traces;
 639 }
 640
 641 bool View::eventFilter(QObject *object, QEvent *event)
 642 {
 643         const QEvent::Type type = event->type();
 644         if (type == QEvent::MouseMove) {
 645
 646                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
 647                 if (object == viewport_)
 648                         hover_point_ = mouse_event->pos();
 649                 else if (object == ruler_)
 650                         hover_point_ = QPoint(mouse_event->x(), 0);
 651                 else if (object == header_)
 652                         hover_point_ = QPoint(0, mouse_event->y());
 653                 else
 654                         hover_point_ = QPoint(-1, -1);
 655
 656                 hover_point_changed();
 657
 658         } else if (type == QEvent::Leave) {
 659                 hover_point_ = QPoint(-1, -1);
 660                 hover_point_changed();
 661         }
 662
 663         return QObject::eventFilter(object, event);
 664 }
 665
 666 bool View::viewportEvent(QEvent *e)
 667 {
 668         switch(e->type()) {
 669         case QEvent::Paint:
 670         case QEvent::MouseButtonPress:
 671         case QEvent::MouseButtonRelease:
 672         case QEvent::MouseButtonDblClick:
 673         case QEvent::MouseMove:
 674         case QEvent::Wheel:
 675         case QEvent::TouchBegin:
 676         case QEvent::TouchUpdate:
 677         case QEvent::TouchEnd:
 678                 return false;
 679
 680         default:
 681                 return QAbstractScrollArea::viewportEvent(e);
 682         }
 683 }
 684
 685 void View::resizeEvent(QResizeEvent*)
 686 {
 687         update_layout();
 688 }
 689
 690 void View::row_item_appearance_changed(bool label, bool content)
 691 {
 692         if (label)
 693                 header_->update();
 694         if (content)
 695                 viewport_->update();
 696 }
 697
 698 void View::time_item_appearance_changed(bool label, bool content)
 699 {
 700         if (label)
 701                 ruler_->update();
 702         if (content)
 703                 viewport_->update();
 704 }
 705
 706 void View::extents_changed(bool horz, bool vert)
 707 {
 708         sticky_events_ |=
 709                 (horz ? RowItemHExtentsChanged : 0) |
 710                 (vert ? RowItemVExtentsChanged : 0);
 711         lazy_event_handler_.start();
 712 }
 713
 714 void View::h_scroll_value_changed(int value)
 715 {
 716         if (updating_scroll_)
 717                 return;
 718
 719         // Disable sticky scrolling when user moves the horizontal scroll bar
 720         // during a running acquisition
 721         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
 722                 sticky_scrolling_ = false;
 723                 sticky_scrolling_changed(false);
 724         }
 725
 726         const int range = horizontalScrollBar()->maximum();
 727         if (range < MaxScrollValue)
 728                 offset_ = scale_ * value;
 729         else {
 730                 double length = 0, offset;
 731                 get_scroll_layout(length, offset);
 732                 offset_ = scale_ * length * value / MaxScrollValue;
 733         }
 734
 735         ruler_->update();
 736         viewport_->update();
 737 }
 738
 739 void View::v_scroll_value_changed()
 740 {
 741         header_->update();
 742         viewport_->update();
 743 }
 744
 745 void View::signals_changed()
 746 {
 747         vector< shared_ptr<RowItem> > new_top_level_items;
 748
 749         const auto device = session_.device();
 750         if (!device)
 751                 return;
 752
 753         shared_ptr<sigrok::Device> sr_dev = device->device();
 754         assert(sr_dev);
 755
 756         // Make a list of traces that are being added, and a list of traces
 757         // that are being removed
 758         const set<shared_ptr<Trace>> prev_traces = list_by_type<Trace>();
 759
 760         shared_lock<shared_mutex> lock(session_.signals_mutex());
 761         const unordered_set< shared_ptr<Signal> > &sigs(session_.signals());
 762
 763         set< shared_ptr<Trace> > traces(sigs.begin(), sigs.end());
 764
 765 #ifdef ENABLE_DECODE
 766         const vector< shared_ptr<DecodeTrace> > decode_traces(
 767                 session().get_decode_signals());
 768         traces.insert(decode_traces.begin(), decode_traces.end());
 769 #endif
 770
 771         set< shared_ptr<Trace> > add_traces;
 772         set_difference(traces.begin(), traces.end(),
 773                 prev_traces.begin(), prev_traces.end(),
 774                 inserter(add_traces, add_traces.begin()));
 775
 776         set< shared_ptr<Trace> > remove_traces;
 777         set_difference(prev_traces.begin(), prev_traces.end(),
 778                 traces.begin(), traces.end(),
 779                 inserter(remove_traces, remove_traces.begin()));
 780
 781         // Make a look-up table of sigrok Channels to pulseview Signals
 782         unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 783                 signal_map;
 784         for (const shared_ptr<Signal> &sig : sigs)
 785                 signal_map[sig->channel()] = sig;
 786
 787         // Populate channel groups
 788         for (auto entry : sr_dev->channel_groups())
 789         {
 790                 const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
 791
 792                 if (group->channels().size() <= 1)
 793                         continue;
 794
 795                 // Find best trace group to add to
 796                 RowItemOwner *owner = find_prevalent_trace_group(
 797                         group, signal_map);
 798
 799                 // If there is no trace group, create one
 800                 shared_ptr<TraceGroup> new_trace_group;
 801                 if (!owner) {
 802                         new_trace_group.reset(new TraceGroup());
 803                         owner = new_trace_group.get();
 804                 }
 805
 806                 // Extract traces for the trace group, removing them from
 807                 // the add list
 808                 const vector< shared_ptr<Trace> > new_traces_in_group =
 809                         extract_new_traces_for_channels(group->channels(),
 810                                 signal_map, add_traces);
 811
 812                 // Add the traces to the group
 813                 const pair<int, int> prev_v_extents = owner->v_extents();
 814                 int offset = prev_v_extents.second - prev_v_extents.first;
 815                 for (shared_ptr<Trace> trace : new_traces_in_group) {
 816                         assert(trace);
 817                         owner->add_child_item(trace);
 818
 819                         const pair<int, int> extents = trace->v_extents();
 820                         if (trace->enabled())
 821                                 offset += -extents.first;
 822                         trace->force_to_v_offset(offset);
 823                         if (trace->enabled())
 824                                 offset += extents.second;
 825                 }
 826
 827                 // If this is a new group, enqueue it in the new top level
 828                 // items list
 829                 if (!new_traces_in_group.empty() && new_trace_group)
 830                         new_top_level_items.push_back(new_trace_group);
 831         }
 832
 833         // Enqueue the remaining channels as free ungrouped traces
 834         const vector< shared_ptr<Trace> > new_top_level_signals =
 835                 extract_new_traces_for_channels(sr_dev->channels(),
 836                         signal_map, add_traces);
 837         new_top_level_items.insert(new_top_level_items.end(),
 838                 new_top_level_signals.begin(), new_top_level_signals.end());
 839
 840         // Enqueue any remaining traces i.e. decode traces
 841         new_top_level_items.insert(new_top_level_items.end(),
 842                 add_traces.begin(), add_traces.end());
 843
 844         // Remove any removed traces
 845         for (shared_ptr<Trace> trace : remove_traces) {
 846                 RowItemOwner *const owner = trace->owner();
 847                 assert(owner);
 848                 owner->remove_child_item(trace);
 849         }
 850
 851         // Add and position the pending top levels items
 852         for (auto item : new_top_level_items) {
 853                 add_child_item(item);
 854
 855                 // Position the item after the last present item
 856                 int offset = v_extents().second;
 857                 const pair<int, int> extents = item->v_extents();
 858                 if (item->enabled())
 859                         offset += -extents.first;
 860                 item->force_to_v_offset(offset);
 861                 if (item->enabled())
 862                         offset += extents.second;
 863         }
 864
 865         update_layout();
 866
 867         header_->update();
 868         viewport_->update();
 869 }
 870
 871 void View::data_updated()
 872 {
 873         // Reset "always zoom to fit" when we change to the stopped state
 874         if (always_zoom_to_fit_ && (session_.get_capture_state() == Session::Stopped)) {
 875                 always_zoom_to_fit_ = false;
 876                 always_zoom_to_fit_changed(false);
 877         }
 878
 879         if (always_zoom_to_fit_ || sticky_scrolling_) {
 880                 if (!delayed_view_updater_.isActive())
 881                         delayed_view_updater_.start();
 882         } else {
 883                 update_scroll();
 884                 ruler_->update();
 885                 viewport_->update();
 886         }
 887 }
 888
 889 void View::perform_delayed_view_update()
 890 {
 891         if (always_zoom_to_fit_)
 892                 zoom_fit(true);
 893
 894         if (sticky_scrolling_) {
 895                 // Make right side of the view sticky
 896                 double length = 0, offset;
 897                 get_scroll_layout(length, offset);
 898
 899                 const QSize areaSize = viewport_->size();
 900                 length = max(length - areaSize.width(), 0.0);
 901
 902                 offset_ = scale_ * length;
 903         }
 904
 905         update_scroll();
 906         ruler_->update();
 907         viewport_->update();
 908 }
 909
 910 void View::process_sticky_events()
 911 {
 912         if (sticky_events_ & RowItemHExtentsChanged)
 913                 update_layout();
 914         if (sticky_events_ & RowItemVExtentsChanged) {
 915                 restack_all_row_items();
 916                 update_scroll();
 917         }
 918
 919         // Clear the sticky events
 920         sticky_events_ = 0;
 921 }
 922
 923 void View::on_hover_point_changed()
 924 {
 925         for (shared_ptr<RowItem> r : *this)
 926                 r->hover_point_changed();
 927 }
 928
 929 } // namespace view
 930 } // namespace pv