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