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