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 <boost/thread/locks.hpp>
  36
  37 #include <QApplication>
  38 #include <QEvent>
  39 #include <QFontMetrics>
  40 #include <QMouseEvent>
  41 #include <QScrollBar>
  42
  43 #include <libsigrokcxx/libsigrokcxx.hpp>
  44
  45 #include "decodetrace.hpp"
  46 #include "header.hpp"
  47 #include "logicsignal.hpp"
  48 #include "ruler.hpp"
  49 #include "signal.hpp"
  50 #include "tracegroup.hpp"
  51 #include "triggermarker.hpp"
  52 #include "view.hpp"
  53 #include "viewport.hpp"
  54
  55 #include "pv/session.hpp"
  56 #include "pv/devices/device.hpp"
  57 #include "pv/data/logic.hpp"
  58 #include "pv/data/logicsegment.hpp"
  59 #include "pv/util.hpp"
  60
  61 using boost::shared_lock;
  62 using boost::shared_mutex;
  63
  64 using pv::data::SignalData;
  65 using pv::data::Segment;
  66 using pv::util::TimeUnit;
  67 using pv::util::Timestamp;
  68
  69 using std::back_inserter;
  70 using std::copy_if;
  71 using std::deque;
  72 using std::dynamic_pointer_cast;
  73 using std::inserter;
  74 using std::list;
  75 using std::lock_guard;
  76 using std::max;
  77 using std::make_pair;
  78 using std::make_shared;
  79 using std::min;
  80 using std::pair;
  81 using std::set;
  82 using std::set_difference;
  83 using std::shared_ptr;
  84 using std::unordered_map;
  85 using std::unordered_set;
  86 using std::vector;
  87 using std::weak_ptr;
  88
  89 namespace pv {
  90 namespace view {
  91
  92 const Timestamp View::MaxScale("1e9");
  93 const Timestamp View::MinScale("1e-12");
  94
  95 const int View::MaxScrollValue = INT_MAX / 2;
  96 const int View::MaxViewAutoUpdateRate = 25; // No more than 25 Hz with sticky scrolling
  97
  98 const int View::ScaleUnits[3] = {1, 2, 5};
  99
 100 View::View(Session &session, QWidget *parent) :
 101         QAbstractScrollArea(parent),
 102         session_(session),
 103         viewport_(new Viewport(*this)),
 104         ruler_(new Ruler(*this)),
 105         header_(new Header(*this)),
 106         scale_(1e-3),
 107         offset_(0),
 108         updating_scroll_(false),
 109         sticky_scrolling_(false), // Default setting is set in MainWindow::setup_ui()
 110         always_zoom_to_fit_(false),
 111         tick_period_(0),
 112         tick_prefix_(pv::util::SIPrefix::yocto),
 113         tick_precision_(0),
 114         time_unit_(util::TimeUnit::Time),
 115         show_cursors_(false),
 116         cursors_(new CursorPair(*this)),
 117         next_flag_text_('A'),
 118         trigger_markers_(),
 119         hover_point_(-1, -1)
 120 {
 121         connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
 122                 this, SLOT(h_scroll_value_changed(int)));
 123         connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 124                 this, SLOT(v_scroll_value_changed()));
 125
 126         connect(&session_, SIGNAL(signals_changed()),
 127                 this, SLOT(signals_changed()));
 128         connect(&session_, SIGNAL(capture_state_changed(int)),
 129                 this, SLOT(capture_state_updated(int)));
 130         connect(&session_, SIGNAL(data_received()),
 131                 this, SLOT(data_updated()));
 132         connect(&session_, SIGNAL(frame_ended()),
 133                 this, SLOT(data_updated()));
 134
 135         connect(header_, SIGNAL(selection_changed()),
 136                 ruler_, SLOT(clear_selection()));
 137         connect(ruler_, SIGNAL(selection_changed()),
 138                 header_, SLOT(clear_selection()));
 139
 140         connect(header_, SIGNAL(selection_changed()),
 141                 this, SIGNAL(selection_changed()));
 142         connect(ruler_, SIGNAL(selection_changed()),
 143                 this, SIGNAL(selection_changed()));
 144
 145         connect(this, SIGNAL(hover_point_changed()),
 146                 this, SLOT(on_hover_point_changed()));
 147
 148         connect(&lazy_event_handler_, SIGNAL(timeout()),
 149                 this, SLOT(process_sticky_events()));
 150         lazy_event_handler_.setSingleShot(true);
 151
 152         connect(&delayed_view_updater_, SIGNAL(timeout()),
 153                 this, SLOT(perform_delayed_view_update()));
 154         delayed_view_updater_.setSingleShot(true);
 155         delayed_view_updater_.setInterval(1000 / MaxViewAutoUpdateRate);
 156
 157         setViewport(viewport_);
 158
 159         viewport_->installEventFilter(this);
 160         ruler_->installEventFilter(this);
 161         header_->installEventFilter(this);
 162
 163         // Trigger the initial event manually. The default device has signals
 164         // which were created before this object came into being
 165         signals_changed();
 166
 167         // make sure the transparent widgets are on the top
 168         ruler_->raise();
 169         header_->raise();
 170
 171         // Update the zoom state
 172         calculate_tick_spacing();
 173 }
 174
 175 Session& View::session()
 176 {
 177         return session_;
 178 }
 179
 180 const Session& View::session() const
 181 {
 182         return session_;
 183 }
 184
 185 View* View::view()
 186 {
 187         return this;
 188 }
 189
 190 const View* View::view() const
 191 {
 192         return this;
 193 }
 194
 195 Viewport* View::viewport()
 196 {
 197         return viewport_;
 198 }
 199
 200 const Viewport* View::viewport() const
 201 {
 202         return viewport_;
 203 }
 204
 205 vector< shared_ptr<TimeItem> > View::time_items() const
 206 {
 207         const vector<shared_ptr<Flag>> f(flags());
 208         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 209         items.push_back(cursors_);
 210         items.push_back(cursors_->first());
 211         items.push_back(cursors_->second());
 212
 213         for (auto trigger_marker : trigger_markers_)
 214                 items.push_back(trigger_marker);
 215
 216         return items;
 217 }
 218
 219 double View::scale() const
 220 {
 221         return scale_;
 222 }
 223
 224 void View::set_scale(double scale)
 225 {
 226         if (scale_ != scale) {
 227                 scale_ = scale;
 228                 Q_EMIT scale_changed();
 229         }
 230 }
 231
 232 const Timestamp& View::offset() const
 233 {
 234         return offset_;
 235 }
 236
 237 void View::set_offset(const pv::util::Timestamp& offset)
 238 {
 239         if (offset_ != offset) {
 240                 offset_ = offset;
 241                 Q_EMIT offset_changed();
 242         }
 243 }
 244
 245 int View::owner_visual_v_offset() const
 246 {
 247         return -verticalScrollBar()->sliderPosition();
 248 }
 249
 250 void View::set_v_offset(int offset)
 251 {
 252         verticalScrollBar()->setSliderPosition(offset);
 253         header_->update();
 254         viewport_->update();
 255 }
 256
 257 unsigned int View::depth() const
 258 {
 259         return 0;
 260 }
 261
 262 pv::util::SIPrefix View::tick_prefix() const
 263 {
 264         return tick_prefix_;
 265 }
 266
 267 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 268 {
 269         if (tick_prefix_ != tick_prefix) {
 270                 tick_prefix_ = tick_prefix;
 271                 Q_EMIT tick_prefix_changed();
 272         }
 273 }
 274
 275 unsigned int View::tick_precision() const
 276 {
 277         return tick_precision_;
 278 }
 279
 280 void View::set_tick_precision(unsigned tick_precision)
 281 {
 282         if (tick_precision_ != tick_precision) {
 283                 tick_precision_ = tick_precision;
 284                 Q_EMIT tick_precision_changed();
 285         }
 286 }
 287
 288 const pv::util::Timestamp& View::tick_period() const
 289 {
 290         return tick_period_;
 291 }
 292
 293 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 294 {
 295         if (tick_period_ != tick_period) {
 296                 tick_period_ = tick_period;
 297                 Q_EMIT tick_period_changed();
 298         }
 299 }
 300
 301 TimeUnit View::time_unit() const
 302 {
 303         return time_unit_;
 304 }
 305
 306 void View::set_time_unit(pv::util::TimeUnit time_unit)
 307 {
 308         if (time_unit_ != time_unit) {
 309                 time_unit_ = time_unit;
 310                 Q_EMIT time_unit_changed();
 311         }
 312 }
 313
 314 void View::zoom(double steps)
 315 {
 316         zoom(steps, viewport_->width() / 2);
 317 }
 318
 319 void View::zoom(double steps, int offset)
 320 {
 321         set_zoom(scale_ * pow(3.0/2.0, -steps), offset);
 322 }
 323
 324 void View::zoom_fit(bool gui_state)
 325 {
 326         // Act as one-shot when stopped, toggle along with the GUI otherwise
 327         if (session_.get_capture_state() == Session::Stopped) {
 328                 always_zoom_to_fit_ = false;
 329                 always_zoom_to_fit_changed(false);
 330         } else {
 331                 always_zoom_to_fit_ = gui_state;
 332                 always_zoom_to_fit_changed(gui_state);
 333         }
 334
 335         const pair<Timestamp, Timestamp> extents = get_time_extents();
 336         const Timestamp delta = extents.second - extents.first;
 337         if (delta < Timestamp("1e-12"))
 338                 return;
 339
 340         assert(viewport_);
 341         const int w = viewport_->width();
 342         if (w <= 0)
 343                 return;
 344
 345         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 346         set_scale_offset(scale.convert_to<double>(), extents.first);
 347 }
 348
 349 void View::zoom_one_to_one()
 350 {
 351         using pv::data::SignalData;
 352
 353         // Make a set of all the visible data objects
 354         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 355         if (visible_data.empty())
 356                 return;
 357
 358         assert(viewport_);
 359         const int w = viewport_->width();
 360         if (w <= 0)
 361                 return;
 362
 363         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 364 }
 365
 366 void View::set_scale_offset(double scale, const Timestamp& offset)
 367 {
 368         // Disable sticky scrolling / always zoom to fit when acquisition runs
 369         // and user drags the viewport
 370         if ((scale_ == scale) && (offset_ != offset) &&
 371                         (session_.get_capture_state() == Session::Running)) {
 372
 373                 if (sticky_scrolling_) {
 374                         sticky_scrolling_ = false;
 375                         sticky_scrolling_changed(false);
 376                 }
 377
 378                 if (always_zoom_to_fit_) {
 379                         always_zoom_to_fit_ = false;
 380                         always_zoom_to_fit_changed(false);
 381                 }
 382         }
 383
 384         set_scale(scale);
 385         set_offset(offset);
 386
 387         calculate_tick_spacing();
 388
 389         update_scroll();
 390         ruler_->update();
 391         viewport_->update();
 392 }
 393
 394 set< shared_ptr<SignalData> > View::get_visible_data() const
 395 {
 396         const unordered_set< shared_ptr<Signal> > sigs(session().signals());
 397
 398         // Make a set of all the visible data objects
 399         set< shared_ptr<SignalData> > visible_data;
 400         for (const shared_ptr<Signal> sig : sigs)
 401                 if (sig->enabled())
 402                         visible_data.insert(sig->data());
 403
 404         return visible_data;
 405 }
 406
 407 pair<Timestamp, Timestamp> View::get_time_extents() const
 408 {
 409         boost::optional<Timestamp> left_time, right_time;
 410         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 411         for (const shared_ptr<SignalData> d : visible_data) {
 412                 const vector< shared_ptr<Segment> > segments =
 413                         d->segments();
 414                 for (const shared_ptr<Segment> &s : segments) {
 415                         double samplerate = s->samplerate();
 416                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 417
 418                         const Timestamp start_time = s->start_time();
 419                         left_time = left_time ?
 420                                 min(*left_time, start_time) :
 421                                                 start_time;
 422                         right_time = right_time ?
 423                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 424                                                  start_time + d->max_sample_count() / samplerate;
 425                 }
 426         }
 427
 428         if (!left_time || !right_time)
 429                 return make_pair(0, 0);
 430
 431         assert(*left_time < *right_time);
 432         return make_pair(*left_time, *right_time);
 433 }
 434
 435 void View::enable_sticky_scrolling(bool state)
 436 {
 437         sticky_scrolling_ = state;
 438 }
 439
 440 bool View::cursors_shown() const
 441 {
 442         return show_cursors_;
 443 }
 444
 445 void View::show_cursors(bool show)
 446 {
 447         show_cursors_ = show;
 448         ruler_->update();
 449         viewport_->update();
 450 }
 451
 452 void View::centre_cursors()
 453 {
 454         const double time_width = scale_ * viewport_->width();
 455         cursors_->first()->set_time(offset_ + time_width * 0.4);
 456         cursors_->second()->set_time(offset_ + time_width * 0.6);
 457         ruler_->update();
 458         viewport_->update();
 459 }
 460
 461 std::shared_ptr<CursorPair> View::cursors() const
 462 {
 463         return cursors_;
 464 }
 465
 466 void View::add_flag(const Timestamp& time)
 467 {
 468         flags_.push_back(shared_ptr<Flag>(new Flag(*this, time,
 469                 QString("%1").arg(next_flag_text_))));
 470
 471         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 472                 (next_flag_text_ + 1);
 473
 474         time_item_appearance_changed(true, true);
 475 }
 476
 477 void View::remove_flag(std::shared_ptr<Flag> flag)
 478 {
 479         flags_.remove(flag);
 480         time_item_appearance_changed(true, true);
 481 }
 482
 483 vector< std::shared_ptr<Flag> > View::flags() const
 484 {
 485         vector< std::shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 486         stable_sort(flags.begin(), flags.end(),
 487                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 488                         return a->time() < b->time();
 489                 });
 490
 491         return flags;
 492 }
 493
 494 const QPoint& View::hover_point() const
 495 {
 496         return hover_point_;
 497 }
 498
 499 void View::update_viewport()
 500 {
 501         assert(viewport_);
 502         viewport_->update();
 503         header_->update();
 504 }
 505
 506 void View::restack_all_trace_tree_items()
 507 {
 508         // Make a list of owners that is sorted from deepest first
 509         const vector<shared_ptr<TraceTreeItem>> items(
 510                 list_by_type<TraceTreeItem>());
 511         set< TraceTreeItemOwner* > owners;
 512         for (const auto &r : items)
 513                 owners.insert(r->owner());
 514         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 515         sort(sorted_owners.begin(), sorted_owners.end(),
 516                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 517                         return a->depth() > b->depth(); });
 518
 519         // Restack the items recursively
 520         for (auto &o : sorted_owners)
 521                 o->restack_items();
 522
 523         // Animate the items to their destination
 524         for (const auto &i : items)
 525                 i->animate_to_layout_v_offset();
 526 }
 527
 528 void View::trigger_event(util::Timestamp location)
 529 {
 530         trigger_markers_.push_back(shared_ptr<TriggerMarker>(
 531                 new TriggerMarker(*this, location)));
 532 }
 533
 534 void View::get_scroll_layout(double &length, Timestamp &offset) const
 535 {
 536         const pair<Timestamp, Timestamp> extents = get_time_extents();
 537         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 538         offset = offset_ / scale_;
 539 }
 540
 541 void View::set_zoom(double scale, int offset)
 542 {
 543         // Reset the "always zoom to fit" feature as the user changed the zoom
 544         always_zoom_to_fit_ = false;
 545         always_zoom_to_fit_changed(false);
 546
 547         const Timestamp cursor_offset = offset_ + scale_ * offset;
 548         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 549         const Timestamp new_offset = cursor_offset - new_scale * offset;
 550         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 551 }
 552
 553 void View::calculate_tick_spacing()
 554 {
 555         const double SpacingIncrement = 10.0f;
 556         const double MinValueSpacing = 40.0f;
 557
 558         // Figure out the highest numeric value visible on a label
 559         const QSize areaSize = viewport_->size();
 560         const Timestamp max_time = max(fabs(offset_),
 561                 fabs(offset_ + scale_ * areaSize.width()));
 562
 563         double min_width = SpacingIncrement;
 564         double label_width, tick_period_width;
 565
 566         QFontMetrics m(QApplication::font());
 567
 568         // Copies of the member variables with the same name, used in the calculation
 569         // and written back afterwards, so that we don't emit signals all the time
 570         // during the calculation.
 571         pv::util::Timestamp tick_period = tick_period_;
 572         pv::util::SIPrefix tick_prefix = tick_prefix_;
 573         unsigned tick_precision = tick_precision_;
 574
 575         do {
 576                 const double min_period = scale_ * min_width;
 577
 578                 const int order = (int)floorf(log10f(min_period));
 579                 const pv::util::Timestamp order_decimal =
 580                         pow(pv::util::Timestamp(10), order);
 581
 582                 // Allow for a margin of error so that a scale unit of 1 can be used.
 583                 // Otherwise, for a SU of 1 the tick period will almost always be below
 584                 // the min_period by a small amount - and thus skipped in favor of 2.
 585                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 586                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 587                 double tp_with_margin;
 588                 unsigned int unit = 0;
 589
 590                 do {
 591                         tp_with_margin = order_decimal.convert_to<double>() *
 592                                 (ScaleUnits[unit++] + tp_margin);
 593                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 594
 595                 tick_period = order_decimal * ScaleUnits[unit - 1];
 596                 tick_prefix = static_cast<pv::util::SIPrefix>(
 597                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 598
 599                 // Precision is the number of fractional digits required, not
 600                 // taking the prefix into account (and it must never be negative)
 601                 tick_precision = std::max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 602
 603                 tick_period_width = (tick_period / scale_).convert_to<double>();
 604
 605                 const QString label_text = Ruler::format_time_with_distance(
 606                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 607
 608                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 609                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 610                                 MinValueSpacing;
 611
 612                 min_width += SpacingIncrement;
 613         } while (tick_period_width < label_width);
 614
 615         set_tick_period(tick_period);
 616         set_tick_prefix(tick_prefix);
 617         set_tick_precision(tick_precision);
 618 }
 619
 620 void View::update_scroll()
 621 {
 622         assert(viewport_);
 623
 624         const QSize areaSize = viewport_->size();
 625
 626         // Set the horizontal scroll bar
 627         double length = 0;
 628         Timestamp offset;
 629         get_scroll_layout(length, offset);
 630         length = max(length - areaSize.width(), 0.0);
 631
 632         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
 633
 634         horizontalScrollBar()->setPageStep(areaSize.width() / 2);
 635         horizontalScrollBar()->setSingleStep(major_tick_distance);
 636
 637         updating_scroll_ = true;
 638
 639         if (length < MaxScrollValue) {
 640                 horizontalScrollBar()->setRange(0, length);
 641                 horizontalScrollBar()->setSliderPosition(offset.convert_to<double>());
 642         } else {
 643                 horizontalScrollBar()->setRange(0, MaxScrollValue);
 644                 horizontalScrollBar()->setSliderPosition(
 645                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
 646         }
 647
 648         updating_scroll_ = false;
 649
 650         // Set the vertical scrollbar
 651         verticalScrollBar()->setPageStep(areaSize.height());
 652         verticalScrollBar()->setSingleStep(areaSize.height() / 8);
 653
 654         const pair<int, int> extents = v_extents();
 655         verticalScrollBar()->setRange(extents.first - (areaSize.height() / 2),
 656                 extents.second - (areaSize.height() / 2));
 657 }
 658
 659 void View::update_layout()
 660 {
 661         setViewportMargins(
 662                 header_->sizeHint().width() - pv::view::Header::BaselineOffset,
 663                 ruler_->sizeHint().height(), 0, 0);
 664         ruler_->setGeometry(viewport_->x(), 0,
 665                 viewport_->width(), ruler_->extended_size_hint().height());
 666         header_->setGeometry(0, viewport_->y(),
 667                 header_->extended_size_hint().width(), viewport_->height());
 668         update_scroll();
 669 }
 670
 671 void View::paint_label(QPainter &p, const QRect &rect, bool hover)
 672 {
 673         (void)p;
 674         (void)rect;
 675         (void)hover;
 676 }
 677
 678 QRectF View::label_rect(const QRectF &rect)
 679 {
 680         (void)rect;
 681         return QRectF();
 682 }
 683
 684 TraceTreeItemOwner* View::find_prevalent_trace_group(
 685         const shared_ptr<sigrok::ChannelGroup> &group,
 686         const unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 687                 &signal_map)
 688 {
 689         assert(group);
 690
 691         unordered_set<TraceTreeItemOwner*> owners;
 692         vector<TraceTreeItemOwner*> owner_list;
 693
 694         // Make a set and a list of all the owners
 695         for (const auto &channel : group->channels()) {
 696                 const auto iter = signal_map.find(channel);
 697                 if (iter == signal_map.end())
 698                         continue;
 699
 700                 TraceTreeItemOwner *const o = (*iter).second->owner();
 701                 owner_list.push_back(o);
 702                 owners.insert(o);
 703         }
 704
 705         // Iterate through the list of owners, and find the most prevalent
 706         size_t max_prevalence = 0;
 707         TraceTreeItemOwner *prevalent_owner = nullptr;
 708         for (TraceTreeItemOwner *owner : owners) {
 709                 const size_t prevalence = std::count_if(
 710                         owner_list.begin(), owner_list.end(),
 711                         [&](TraceTreeItemOwner *o) { return o == owner; });
 712                 if (prevalence > max_prevalence) {
 713                         max_prevalence = prevalence;
 714                         prevalent_owner = owner;
 715                 }
 716         }
 717
 718         return prevalent_owner;
 719 }
 720
 721 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
 722         const vector< shared_ptr<sigrok::Channel> > &channels,
 723         const unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 724                 &signal_map,
 725         set< shared_ptr<Trace> > &add_list)
 726 {
 727         vector< shared_ptr<Trace> > filtered_traces;
 728
 729         for (const auto &channel : channels) {
 730                 const auto map_iter = signal_map.find(channel);
 731                 if (map_iter == signal_map.end())
 732                         continue;
 733
 734                 shared_ptr<Trace> trace = (*map_iter).second;
 735                 const auto list_iter = add_list.find(trace);
 736                 if (list_iter == add_list.end())
 737                         continue;
 738
 739                 filtered_traces.push_back(trace);
 740                 add_list.erase(list_iter);
 741         }
 742
 743         return filtered_traces;
 744 }
 745
 746 void View::determine_time_unit()
 747 {
 748         // Check whether we know the sample rate and hence can use time as the unit
 749         if (time_unit_ == util::TimeUnit::Samples) {
 750                 const unordered_set< shared_ptr<Signal> > sigs(session().signals());
 751
 752                 // Check all signals but...
 753                 for (const shared_ptr<Signal> signal : sigs) {
 754                         const shared_ptr<SignalData> data = signal->data();
 755
 756                         // ...only check first segment of each
 757                         const vector< shared_ptr<Segment> > segments = data->segments();
 758                         if (!segments.empty())
 759                                 if (segments[0]->samplerate()) {
 760                                         set_time_unit(util::TimeUnit::Time);
 761                                         break;
 762                                 }
 763                 }
 764         }
 765 }
 766
 767 bool View::eventFilter(QObject *object, QEvent *event)
 768 {
 769         const QEvent::Type type = event->type();
 770         if (type == QEvent::MouseMove) {
 771
 772                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
 773                 if (object == viewport_)
 774                         hover_point_ = mouse_event->pos();
 775                 else if (object == ruler_)
 776                         hover_point_ = QPoint(mouse_event->x(), 0);
 777                 else if (object == header_)
 778                         hover_point_ = QPoint(0, mouse_event->y());
 779                 else
 780                         hover_point_ = QPoint(-1, -1);
 781
 782                 hover_point_changed();
 783
 784         } else if (type == QEvent::Leave) {
 785                 hover_point_ = QPoint(-1, -1);
 786                 hover_point_changed();
 787         }
 788
 789         return QObject::eventFilter(object, event);
 790 }
 791
 792 bool View::viewportEvent(QEvent *e)
 793 {
 794         switch (e->type()) {
 795         case QEvent::Paint:
 796         case QEvent::MouseButtonPress:
 797         case QEvent::MouseButtonRelease:
 798         case QEvent::MouseButtonDblClick:
 799         case QEvent::MouseMove:
 800         case QEvent::Wheel:
 801         case QEvent::TouchBegin:
 802         case QEvent::TouchUpdate:
 803         case QEvent::TouchEnd:
 804                 return false;
 805         default:
 806                 return QAbstractScrollArea::viewportEvent(e);
 807         }
 808 }
 809
 810 void View::resizeEvent(QResizeEvent*)
 811 {
 812         update_layout();
 813 }
 814
 815 void View::row_item_appearance_changed(bool label, bool content)
 816 {
 817         if (label)
 818                 header_->update();
 819         if (content)
 820                 viewport_->update();
 821 }
 822
 823 void View::time_item_appearance_changed(bool label, bool content)
 824 {
 825         if (label)
 826                 ruler_->update();
 827         if (content)
 828                 viewport_->update();
 829 }
 830
 831 void View::extents_changed(bool horz, bool vert)
 832 {
 833         sticky_events_ |=
 834                 (horz ? TraceTreeItemHExtentsChanged : 0) |
 835                 (vert ? TraceTreeItemVExtentsChanged : 0);
 836         lazy_event_handler_.start();
 837 }
 838
 839 void View::h_scroll_value_changed(int value)
 840 {
 841         if (updating_scroll_)
 842                 return;
 843
 844         // Disable sticky scrolling when user moves the horizontal scroll bar
 845         // during a running acquisition
 846         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
 847                 sticky_scrolling_ = false;
 848                 sticky_scrolling_changed(false);
 849         }
 850
 851         const int range = horizontalScrollBar()->maximum();
 852         if (range < MaxScrollValue)
 853                 set_offset(scale_ * value);
 854         else {
 855                 double length = 0;
 856                 Timestamp offset;
 857                 get_scroll_layout(length, offset);
 858                 set_offset(scale_ * length * value / MaxScrollValue);
 859         }
 860
 861         ruler_->update();
 862         viewport_->update();
 863 }
 864
 865 void View::v_scroll_value_changed()
 866 {
 867         header_->update();
 868         viewport_->update();
 869 }
 870
 871 void View::signals_changed()
 872 {
 873         using sigrok::Channel;
 874
 875         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
 876
 877         const auto device = session_.device();
 878         if (!device)
 879                 return;
 880
 881         shared_ptr<sigrok::Device> sr_dev = device->device();
 882         assert(sr_dev);
 883
 884         const vector< shared_ptr<Channel> > channels(
 885                 sr_dev->channels());
 886
 887         // Make a list of traces that are being added, and a list of traces
 888         // that are being removed
 889         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
 890         const set<shared_ptr<Trace>> prev_traces(
 891                 prev_trace_list.begin(), prev_trace_list.end());
 892
 893         const unordered_set< shared_ptr<Signal> > sigs(session_.signals());
 894
 895         set< shared_ptr<Trace> > traces(sigs.begin(), sigs.end());
 896
 897 #ifdef ENABLE_DECODE
 898         const vector< shared_ptr<DecodeTrace> > decode_traces(
 899                 session().get_decode_signals());
 900         traces.insert(decode_traces.begin(), decode_traces.end());
 901 #endif
 902
 903         set< shared_ptr<Trace> > add_traces;
 904         set_difference(traces.begin(), traces.end(),
 905                 prev_traces.begin(), prev_traces.end(),
 906                 inserter(add_traces, add_traces.begin()));
 907
 908         set< shared_ptr<Trace> > remove_traces;
 909         set_difference(prev_traces.begin(), prev_traces.end(),
 910                 traces.begin(), traces.end(),
 911                 inserter(remove_traces, remove_traces.begin()));
 912
 913         // Make a look-up table of sigrok Channels to pulseview Signals
 914         unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 915                 signal_map;
 916         for (const shared_ptr<Signal> &sig : sigs)
 917                 signal_map[sig->channel()] = sig;
 918
 919         // Populate channel groups
 920         for (auto entry : sr_dev->channel_groups()) {
 921                 const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
 922
 923                 if (group->channels().size() <= 1)
 924                         continue;
 925
 926                 // Find best trace group to add to
 927                 TraceTreeItemOwner *owner = find_prevalent_trace_group(
 928                         group, signal_map);
 929
 930                 // If there is no trace group, create one
 931                 shared_ptr<TraceGroup> new_trace_group;
 932                 if (!owner) {
 933                         new_trace_group.reset(new TraceGroup());
 934                         owner = new_trace_group.get();
 935                 }
 936
 937                 // Extract traces for the trace group, removing them from
 938                 // the add list
 939                 const vector< shared_ptr<Trace> > new_traces_in_group =
 940                         extract_new_traces_for_channels(group->channels(),
 941                                 signal_map, add_traces);
 942
 943                 // Add the traces to the group
 944                 const pair<int, int> prev_v_extents = owner->v_extents();
 945                 int offset = prev_v_extents.second - prev_v_extents.first;
 946                 for (shared_ptr<Trace> trace : new_traces_in_group) {
 947                         assert(trace);
 948                         owner->add_child_item(trace);
 949
 950                         const pair<int, int> extents = trace->v_extents();
 951                         if (trace->enabled())
 952                                 offset += -extents.first;
 953                         trace->force_to_v_offset(offset);
 954                         if (trace->enabled())
 955                                 offset += extents.second;
 956                 }
 957
 958                 // If this is a new group, enqueue it in the new top level
 959                 // items list
 960                 if (!new_traces_in_group.empty() && new_trace_group)
 961                         new_top_level_items.push_back(new_trace_group);
 962         }
 963
 964         // Enqueue the remaining logic channels in a group
 965         vector< shared_ptr<Channel> > logic_channels;
 966         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
 967                 [](const shared_ptr<Channel>& c) {
 968                         return c->type() == sigrok::ChannelType::LOGIC; });
 969         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
 970                 extract_new_traces_for_channels(logic_channels,
 971                         signal_map, add_traces);
 972         const shared_ptr<TraceGroup> non_grouped_trace_group(
 973                 make_shared<TraceGroup>());
 974         for (shared_ptr<Trace> trace : non_grouped_logic_signals)
 975                 non_grouped_trace_group->add_child_item(trace);
 976         new_top_level_items.push_back(non_grouped_trace_group);
 977
 978         // Enqueue the remaining channels as free ungrouped traces
 979         const vector< shared_ptr<Trace> > new_top_level_signals =
 980                 extract_new_traces_for_channels(channels,
 981                         signal_map, add_traces);
 982         new_top_level_items.insert(new_top_level_items.end(),
 983                 new_top_level_signals.begin(), new_top_level_signals.end());
 984
 985         // Enqueue any remaining traces i.e. decode traces
 986         new_top_level_items.insert(new_top_level_items.end(),
 987                 add_traces.begin(), add_traces.end());
 988
 989         // Remove any removed traces
 990         for (shared_ptr<Trace> trace : remove_traces) {
 991                 TraceTreeItemOwner *const owner = trace->owner();
 992                 assert(owner);
 993                 owner->remove_child_item(trace);
 994         }
 995
 996         // Add and position the pending top levels items
 997         for (auto item : new_top_level_items) {
 998                 add_child_item(item);
 999
1000                 // Position the item after the last present item
1001                 int offset = v_extents().second;
1002                 const pair<int, int> extents = item->v_extents();
1003                 if (item->enabled())
1004                         offset += -extents.first;
1005                 item->force_to_v_offset(offset);
1006                 if (item->enabled())
1007                         offset += extents.second;
1008         }
1009
1010         update_layout();
1011
1012         header_->update();
1013         viewport_->update();
1014 }
1015
1016 void View::capture_state_updated(int state)
1017 {
1018         if (state == Session::Running) {
1019                 set_time_unit(util::TimeUnit::Samples);
1020
1021                 trigger_markers_.clear();
1022         }
1023
1024         if (state == Session::Stopped) {
1025                 // After acquisition has stopped we need to re-calculate the ticks once
1026                 // as it's otherwise done when the user pans or zooms, which is too late
1027                 calculate_tick_spacing();
1028
1029                 // Reset "always zoom to fit", the acquisition has stopped
1030                 if (always_zoom_to_fit_) {
1031                         always_zoom_to_fit_ = false;
1032                         always_zoom_to_fit_changed(false);
1033                 }
1034         }
1035 }
1036
1037 void View::data_updated()
1038 {
1039         if (always_zoom_to_fit_ || sticky_scrolling_) {
1040                 if (!delayed_view_updater_.isActive())
1041                         delayed_view_updater_.start();
1042         } else {
1043                 determine_time_unit();
1044                 update_scroll();
1045                 ruler_->update();
1046                 viewport_->update();
1047         }
1048 }
1049
1050 void View::perform_delayed_view_update()
1051 {
1052         if (always_zoom_to_fit_)
1053                 zoom_fit(true);
1054
1055         if (sticky_scrolling_) {
1056                 // Make right side of the view sticky
1057                 double length = 0;
1058                 Timestamp offset;
1059                 get_scroll_layout(length, offset);
1060
1061                 const QSize areaSize = viewport_->size();
1062                 length = max(length - areaSize.width(), 0.0);
1063
1064                 set_offset(scale_ * length);
1065         }
1066
1067         determine_time_unit();
1068         update_scroll();
1069         ruler_->update();
1070         viewport_->update();
1071 }
1072
1073 void View::process_sticky_events()
1074 {
1075         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1076                 update_layout();
1077         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1078                 restack_all_trace_tree_items();
1079                 update_scroll();
1080         }
1081
1082         // Clear the sticky events
1083         sticky_events_ = 0;
1084 }
1085
1086 void View::on_hover_point_changed()
1087 {
1088         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1089                 list_by_type<TraceTreeItem>());
1090         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1091                 r->hover_point_changed();
1092 }
1093
1094 } // namespace view
1095 } // namespace pv