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