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