pv/view/view.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #ifdef ENABLE_DECODE
  22 #include <libsigrokdecode/libsigrokdecode.h>
  23 #endif
  24
  25 #include <extdef.h>
  26
  27 #include <algorithm>
  28 #include <cassert>
  29 #include <climits>
  30 #include <cmath>
  31 #include <iterator>
  32 #include <mutex>
  33 #include <unordered_set>
  34
  35 #include <QApplication>
  36 #include <QEvent>
  37 #include <QFontMetrics>
  38 #include <QMouseEvent>
  39 #include <QScrollBar>
  40
  41 #include <libsigrokcxx/libsigrokcxx.hpp>
  42
  43 #include "decodetrace.hpp"
  44 #include "header.hpp"
  45 #include "logicsignal.hpp"
  46 #include "ruler.hpp"
  47 #include "signal.hpp"
  48 #include "tracegroup.hpp"
  49 #include "view.hpp"
  50 #include "viewport.hpp"
  51
  52 #include "pv/session.hpp"
  53 #include "pv/devices/device.hpp"
  54 #include "pv/data/logic.hpp"
  55 #include "pv/data/logicsegment.hpp"
  56 #include "pv/util.hpp"
  57
  58 using boost::shared_lock;
  59 using boost::shared_mutex;
  60
  61 using pv::data::SignalData;
  62 using pv::data::Segment;
  63 using pv::util::format_time;
  64 using pv::util::TimeUnit;
  65 using pv::util::Timestamp;
  66
  67 using std::deque;
  68 using std::dynamic_pointer_cast;
  69 using std::inserter;
  70 using std::list;
  71 using std::lock_guard;
  72 using std::max;
  73 using std::make_pair;
  74 using std::min;
  75 using std::pair;
  76 using std::set;
  77 using std::set_difference;
  78 using std::shared_ptr;
  79 using std::unordered_map;
  80 using std::unordered_set;
  81 using std::vector;
  82 using std::weak_ptr;
  83
  84 namespace pv {
  85 namespace view {
  86
  87 const Timestamp View::MaxScale("1e9");
  88 const Timestamp View::MinScale("1e-12");
  89
  90 const int View::MaxScrollValue = INT_MAX / 2;
  91 const int View::MaxViewAutoUpdateRate = 25; // No more than 25 Hz with sticky scrolling
  92
  93 const int View::ScaleUnits[3] = {1, 2, 5};
  94
  95 View::View(Session &session, QWidget *parent) :
  96         QAbstractScrollArea(parent),
  97         session_(session),
  98         viewport_(new Viewport(*this)),
  99         ruler_(new Ruler(*this)),
 100         header_(new Header(*this)),
 101         scale_(1e-3),
 102         offset_(0),
 103         updating_scroll_(false),
 104         sticky_scrolling_(false), // Default setting is set in MainWindow::setup_ui()
 105         always_zoom_to_fit_(false),
 106         tick_period_(0.0),
 107         tick_prefix_(pv::util::SIPrefix::yocto),
 108         tick_precision_(0),
 109         time_unit_(util::TimeUnit::Time),
 110         show_cursors_(false),
 111         cursors_(new CursorPair(*this)),
 112         next_flag_text_('A'),
 113         hover_point_(-1, -1)
 114 {
 115         connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
 116                 this, SLOT(h_scroll_value_changed(int)));
 117         connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 118                 this, SLOT(v_scroll_value_changed()));
 119
 120         connect(&session_, SIGNAL(signals_changed()),
 121                 this, SLOT(signals_changed()));
 122         connect(&session_, SIGNAL(capture_state_changed(int)),
 123                 this, SLOT(capture_state_updated(int)));
 124         connect(&session_, SIGNAL(data_received()),
 125                 this, SLOT(data_updated()));
 126         connect(&session_, SIGNAL(frame_ended()),
 127                 this, SLOT(data_updated()));
 128
 129         connect(header_, SIGNAL(selection_changed()),
 130                 ruler_, SLOT(clear_selection()));
 131         connect(ruler_, SIGNAL(selection_changed()),
 132                 header_, SLOT(clear_selection()));
 133
 134         connect(header_, SIGNAL(selection_changed()),
 135                 this, SIGNAL(selection_changed()));
 136         connect(ruler_, SIGNAL(selection_changed()),
 137                 this, SIGNAL(selection_changed()));
 138
 139         connect(this, SIGNAL(hover_point_changed()),
 140                 this, SLOT(on_hover_point_changed()));
 141
 142         connect(&lazy_event_handler_, SIGNAL(timeout()),
 143                 this, SLOT(process_sticky_events()));
 144         lazy_event_handler_.setSingleShot(true);
 145
 146         connect(&delayed_view_updater_, SIGNAL(timeout()),
 147                 this, SLOT(perform_delayed_view_update()));
 148         delayed_view_updater_.setSingleShot(true);
 149         delayed_view_updater_.setInterval(1000 / MaxViewAutoUpdateRate);
 150
 151         setViewport(viewport_);
 152
 153         viewport_->installEventFilter(this);
 154         ruler_->installEventFilter(this);
 155         header_->installEventFilter(this);
 156
 157         // Trigger the initial event manually. The default device has signals
 158         // which were created before this object came into being
 159         signals_changed();
 160
 161         // make sure the transparent widgets are on the top
 162         ruler_->raise();
 163         header_->raise();
 164
 165         // Update the zoom state
 166         calculate_tick_spacing();
 167 }
 168
 169 Session& View::session()
 170 {
 171         return session_;
 172 }
 173
 174 const Session& View::session() const
 175 {
 176         return session_;
 177 }
 178
 179 View* View::view()
 180 {
 181         return this;
 182 }
 183
 184 const View* View::view() const
 185 {
 186         return this;
 187 }
 188
 189 Viewport* View::viewport()
 190 {
 191         return viewport_;
 192 }
 193
 194 const Viewport* View::viewport() const
 195 {
 196         return viewport_;
 197 }
 198
 199 vector< shared_ptr<TimeItem> > View::time_items() const
 200 {
 201         const vector<shared_ptr<Flag>> f(flags());
 202         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 203         items.push_back(cursors_);
 204         items.push_back(cursors_->first());
 205         items.push_back(cursors_->second());
 206         return items;
 207 }
 208
 209 double View::scale() const
 210 {
 211         return scale_;
 212 }
 213
 214 void View::set_scale(double scale)
 215 {
 216         if (scale_ != scale) {
 217                 scale_ = scale;
 218                 Q_EMIT scale_changed();
 219         }
 220 }
 221
 222 const Timestamp& View::offset() const
 223 {
 224         return offset_;
 225 }
 226
 227 void View::set_offset(const pv::util::Timestamp& offset)
 228 {
 229         if (offset_ != offset) {
 230                 offset_ = offset;
 231                 Q_EMIT offset_changed();
 232         }
 233 }
 234
 235 int View::owner_visual_v_offset() const
 236 {
 237         return -verticalScrollBar()->sliderPosition();
 238 }
 239
 240 void View::set_v_offset(int offset)
 241 {
 242         verticalScrollBar()->setSliderPosition(offset);
 243         header_->update();
 244         viewport_->update();
 245 }
 246
 247 unsigned int View::depth() const
 248 {
 249         return 0;
 250 }
 251
 252 pv::util::SIPrefix View::tick_prefix() const
 253 {
 254         return tick_prefix_;
 255 }
 256
 257 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 258 {
 259         if (tick_prefix_ != tick_prefix) {
 260                 tick_prefix_ = tick_prefix;
 261                 Q_EMIT tick_prefix_changed();
 262         }
 263 }
 264
 265 unsigned int View::tick_precision() const
 266 {
 267         return tick_precision_;
 268 }
 269
 270 void View::set_tick_precision(unsigned tick_precision)
 271 {
 272         if (tick_precision_ != tick_precision) {
 273                 tick_precision_ = tick_precision;
 274                 Q_EMIT tick_precision_changed();
 275         }
 276 }
 277
 278 double View::tick_period() const
 279 {
 280         return tick_period_;
 281 }
 282
 283 void View::set_tick_period(double tick_period)
 284 {
 285         if (tick_period_ != tick_period) {
 286                 tick_period_ = tick_period;
 287                 Q_EMIT tick_period_changed();
 288         }
 289 }
 290
 291 TimeUnit View::time_unit() const
 292 {
 293         return time_unit_;
 294 }
 295
 296 void View::set_time_unit(pv::util::TimeUnit time_unit)
 297 {
 298         if (time_unit_ != time_unit) {
 299                 time_unit_ = time_unit;
 300                 Q_EMIT time_unit_changed();
 301         }
 302 }
 303
 304 void View::zoom(double steps)
 305 {
 306         zoom(steps, viewport_->width() / 2);
 307 }
 308
 309 void View::zoom(double steps, int offset)
 310 {
 311         set_zoom(scale_ * pow(3.0/2.0, -steps), offset);
 312 }
 313
 314 void View::zoom_fit(bool gui_state)
 315 {
 316         // Act as one-shot when stopped, toggle along with the GUI otherwise
 317         if (session_.get_capture_state() == Session::Stopped) {
 318                 always_zoom_to_fit_ = false;
 319                 always_zoom_to_fit_changed(false);
 320         } else {
 321                 always_zoom_to_fit_ = gui_state;
 322                 always_zoom_to_fit_changed(gui_state);
 323         }
 324
 325         const pair<Timestamp, Timestamp> extents = get_time_extents();
 326         const Timestamp delta = extents.second - extents.first;
 327         if (delta < Timestamp("1e-12"))
 328                 return;
 329
 330         assert(viewport_);
 331         const int w = viewport_->width();
 332         if (w <= 0)
 333                 return;
 334
 335         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 336         set_scale_offset(scale.convert_to<double>(), extents.first);
 337 }
 338
 339 void View::zoom_one_to_one()
 340 {
 341         using pv::data::SignalData;
 342
 343         // Make a set of all the visible data objects
 344         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 345         if (visible_data.empty())
 346                 return;
 347
 348         double samplerate = 0.0;
 349         for (const shared_ptr<SignalData> d : visible_data) {
 350                 assert(d);
 351                 const vector< shared_ptr<Segment> > segments =
 352                         d->segments();
 353                 for (const shared_ptr<Segment> &s : segments)
 354                         samplerate = max(samplerate, s->samplerate());
 355         }
 356
 357         if (samplerate == 0.0)
 358                 return;
 359
 360         assert(viewport_);
 361         const int w = viewport_->width();
 362         if (w <= 0)
 363                 return;
 364
 365         set_zoom(1.0 / samplerate, w / 2);
 366 }
 367
 368 void View::set_scale_offset(double scale, const Timestamp& offset)
 369 {
 370         // Disable sticky scrolling / always zoom to fit when acquisition runs
 371         // and user drags the viewport
 372         if ((scale_ == scale) && (offset_ != offset) &&
 373                         (session_.get_capture_state() == Session::Running)) {
 374
 375                 if (sticky_scrolling_) {
 376                         sticky_scrolling_ = false;
 377                         sticky_scrolling_changed(false);
 378                 }
 379
 380                 if (always_zoom_to_fit_) {
 381                         always_zoom_to_fit_ = false;
 382                         always_zoom_to_fit_changed(false);
 383                 }
 384         }
 385
 386         set_scale(scale);
 387         set_offset(offset);
 388
 389         calculate_tick_spacing();
 390
 391         update_scroll();
 392         ruler_->update();
 393         viewport_->update();
 394 }
 395
 396 set< shared_ptr<SignalData> > View::get_visible_data() const
 397 {
 398         shared_lock<shared_mutex> lock(session().signals_mutex());
 399         const unordered_set< shared_ptr<Signal> > &sigs(session().signals());
 400
 401         // Make a set of all the visible data objects
 402         set< shared_ptr<SignalData> > visible_data;
 403         for (const shared_ptr<Signal> sig : sigs)
 404                 if (sig->enabled())
 405                         visible_data.insert(sig->data());
 406
 407         return visible_data;
 408 }
 409
 410 pair<Timestamp, Timestamp> View::get_time_extents() const
 411 {
 412         boost::optional<Timestamp> left_time, right_time;
 413         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 414         for (const shared_ptr<SignalData> d : visible_data)
 415         {
 416                 const vector< shared_ptr<Segment> > segments =
 417                         d->segments();
 418                 for (const shared_ptr<Segment> &s : segments) {
 419                         double samplerate = s->samplerate();
 420                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 421
 422                         const Timestamp start_time = s->start_time();
 423                         left_time = left_time ?
 424                                 min(*left_time, start_time) :
 425                                                 start_time;
 426                         right_time = right_time ?
 427                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 428                                                  start_time + d->max_sample_count() / samplerate;
 429                 }
 430         }
 431
 432         if (!left_time || !right_time)
 433                 return make_pair(0, 0);
 434
 435         assert(*left_time < *right_time);
 436         return make_pair(*left_time, *right_time);
 437 }
 438
 439 void View::enable_sticky_scrolling(bool state)
 440 {
 441         sticky_scrolling_ = state;
 442 }
 443
 444 bool View::cursors_shown() const
 445 {
 446         return show_cursors_;
 447 }
 448
 449 void View::show_cursors(bool show)
 450 {
 451         show_cursors_ = show;
 452         ruler_->update();
 453         viewport_->update();
 454 }
 455
 456 void View::centre_cursors()
 457 {
 458         const double time_width = scale_ * viewport_->width();
 459         cursors_->first()->set_time(offset_ + time_width * 0.4);
 460         cursors_->second()->set_time(offset_ + time_width * 0.6);
 461         ruler_->update();
 462         viewport_->update();
 463 }
 464
 465 std::shared_ptr<CursorPair> View::cursors() const
 466 {
 467         return cursors_;
 468 }
 469
 470 void View::add_flag(const Timestamp& time)
 471 {
 472         flags_.push_back(shared_ptr<Flag>(new Flag(*this, time,
 473                 QString("%1").arg(next_flag_text_))));
 474         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 475                 (next_flag_text_ + 1);
 476         time_item_appearance_changed(true, true);
 477 }
 478
 479 void View::remove_flag(std::shared_ptr<Flag> flag)
 480 {
 481         flags_.remove(flag);
 482         time_item_appearance_changed(true, true);
 483 }
 484
 485 vector< std::shared_ptr<Flag> > View::flags() const
 486 {
 487         vector< std::shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 488         stable_sort(flags.begin(), flags.end(),
 489                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 490                         return a->time() < b->time();
 491                 });
 492
 493         return flags;
 494 }
 495
 496 const QPoint& View::hover_point() const
 497 {
 498         return hover_point_;
 499 }
 500
 501 void View::update_viewport()
 502 {
 503         assert(viewport_);
 504         viewport_->update();
 505         header_->update();
 506 }
 507
 508 void View::restack_all_row_items()
 509 {
 510         // Make a list of owners that is sorted from deepest first
 511         const auto owners = list_row_item_owners();
 512         vector< RowItemOwner* > sorted_owners(owners.begin(), owners.end());
 513         sort(sorted_owners.begin(), sorted_owners.end(),
 514                 [](const RowItemOwner* a, const RowItemOwner *b) {
 515                         return a->depth() > b->depth(); });
 516
 517         // Restack the items recursively
 518         for (auto &o : sorted_owners)
 519                 o->restack_items();
 520
 521         // Animate the items to their destination
 522         for (const auto &r : *this)
 523                 r->animate_to_layout_v_offset();
 524 }
 525
 526 void View::get_scroll_layout(double &length, Timestamp &offset) const
 527 {
 528         const pair<Timestamp, Timestamp> extents = get_time_extents();
 529         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 530         offset = offset_ / scale_;
 531 }
 532
 533 void View::set_zoom(double scale, int offset)
 534 {
 535         // Reset the "always zoom to fit" feature as the user changed the zoom
 536         always_zoom_to_fit_ = false;
 537         always_zoom_to_fit_changed(false);
 538
 539         const Timestamp cursor_offset = offset_ + scale_ * offset;
 540         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 541         const Timestamp new_offset = cursor_offset - new_scale * offset;
 542         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 543 }
 544
 545 void View::calculate_tick_spacing()
 546 {
 547         const double SpacingIncrement = 10.0f;
 548         const double MinValueSpacing = 40.0f;
 549
 550         // Figure out the highest numeric value visible on a label
 551         const QSize areaSize = viewport_->size();
 552         const Timestamp max_time = max(fabs(offset_),
 553                 fabs(offset_ + scale_ * areaSize.width()));
 554
 555         double min_width = SpacingIncrement;
 556         double label_width, tick_period_width;
 557
 558         QFontMetrics m(QApplication::font());
 559
 560         do {
 561                 const double min_period = scale_ * min_width;
 562
 563                 const int order = (int)floorf(log10f(min_period));
 564                 const double order_decimal = pow(10.0, order);
 565
 566                 // Allow for a margin of error so that a scale unit of 1 can be used.
 567                 // Otherwise, for a SU of 1 the tick period will almost always be below
 568                 // the min_period by a small amount - and thus skipped in favor of 2.
 569                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 570                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 571                 double tp_with_margin;
 572                 unsigned int unit = 0;
 573
 574                 do {
 575                         tp_with_margin = order_decimal * (ScaleUnits[unit++] + tp_margin);
 576                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 577
 578                 set_tick_period(order_decimal * ScaleUnits[unit - 1]);
 579                 set_tick_prefix(static_cast<pv::util::SIPrefix>(
 580                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3));
 581
 582                 // Precision is the number of fractional digits required, not
 583                 // taking the prefix into account (and it must never be negative)
 584                 set_tick_precision(std::max((int)ceil(log10f(1 / tick_period_)), 0));
 585
 586                 tick_period_width = tick_period_ / scale_;
 587
 588                 const QString label_text =
 589                         format_time(max_time, tick_prefix_, time_unit_, tick_precision_);
 590
 591                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 592                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 593                                 MinValueSpacing;
 594
 595                 min_width += SpacingIncrement;
 596
 597         } while (tick_period_width < label_width);
 598 }
 599
 600 void View::update_scroll()
 601 {
 602         assert(viewport_);
 603
 604         const QSize areaSize = viewport_->size();
 605
 606         // Set the horizontal scroll bar
 607         double length = 0;
 608         Timestamp offset;
 609         get_scroll_layout(length, offset);
 610         length = max(length - areaSize.width(), 0.0);
 611
 612         int major_tick_distance = tick_period_ / scale_;
 613
 614         horizontalScrollBar()->setPageStep(areaSize.width() / 2);
 615         horizontalScrollBar()->setSingleStep(major_tick_distance);
 616
 617         updating_scroll_ = true;
 618
 619         if (length < MaxScrollValue) {
 620                 horizontalScrollBar()->setRange(0, length);
 621                 horizontalScrollBar()->setSliderPosition(offset.convert_to<double>());
 622         } else {
 623                 horizontalScrollBar()->setRange(0, MaxScrollValue);
 624                 horizontalScrollBar()->setSliderPosition(
 625                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
 626         }
 627
 628         updating_scroll_ = false;
 629
 630         // Set the vertical scrollbar
 631         verticalScrollBar()->setPageStep(areaSize.height());
 632         verticalScrollBar()->setSingleStep(areaSize.height() / 8);
 633
 634         const pair<int, int> extents = v_extents();
 635         verticalScrollBar()->setRange(extents.first - (areaSize.height() / 2),
 636                 extents.second - (areaSize.height() / 2));
 637 }
 638
 639 void View::update_layout()
 640 {
 641         setViewportMargins(
 642                 header_->sizeHint().width() - pv::view::Header::BaselineOffset,
 643                 ruler_->sizeHint().height(), 0, 0);
 644         ruler_->setGeometry(viewport_->x(), 0,
 645                 viewport_->width(), ruler_->extended_size_hint().height());
 646         header_->setGeometry(0, viewport_->y(),
 647                 header_->extended_size_hint().width(), viewport_->height());
 648         update_scroll();
 649 }
 650
 651 void View::paint_label(QPainter &p, const QRect &rect, bool hover)
 652 {
 653         (void)p;
 654         (void)rect;
 655         (void)hover;
 656 }
 657
 658 QRectF View::label_rect(const QRectF &rect)
 659 {
 660         (void)rect;
 661         return QRectF();
 662 }
 663
 664 RowItemOwner* View::find_prevalent_trace_group(
 665         const shared_ptr<sigrok::ChannelGroup> &group,
 666         const unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 667                 &signal_map)
 668 {
 669         assert(group);
 670
 671         unordered_set<RowItemOwner*> owners;
 672         vector<RowItemOwner*> owner_list;
 673
 674         // Make a set and a list of all the owners
 675         for (const auto &channel : group->channels()) {
 676                 const auto iter = signal_map.find(channel);
 677                 if (iter == signal_map.end())
 678                         continue;
 679
 680                 RowItemOwner *const o = (*iter).second->owner();
 681                 owner_list.push_back(o);
 682                 owners.insert(o);
 683         }
 684
 685         // Iterate through the list of owners, and find the most prevalent
 686         size_t max_prevalence = 0;
 687         RowItemOwner *prevalent_owner = nullptr;
 688         for (RowItemOwner *owner : owners) {
 689                 const size_t prevalence = std::count_if(
 690                         owner_list.begin(), owner_list.end(),
 691                         [&](RowItemOwner *o) { return o == owner; });
 692                 if (prevalence > max_prevalence) {
 693                         max_prevalence = prevalence;
 694                         prevalent_owner = owner;
 695                 }
 696         }
 697
 698         return prevalent_owner;
 699 }
 700
 701 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
 702         const vector< shared_ptr<sigrok::Channel> > &channels,
 703         const unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 704                 &signal_map,
 705         set< shared_ptr<Trace> > &add_list)
 706 {
 707         vector< shared_ptr<Trace> > filtered_traces;
 708
 709         for (const auto &channel : channels)
 710         {
 711                 const auto map_iter = signal_map.find(channel);
 712                 if (map_iter == signal_map.end())
 713                         continue;
 714
 715                 shared_ptr<Trace> trace = (*map_iter).second;
 716                 const auto list_iter = add_list.find(trace);
 717                 if (list_iter == add_list.end())
 718                         continue;
 719
 720                 filtered_traces.push_back(trace);
 721                 add_list.erase(list_iter);
 722         }
 723
 724         return filtered_traces;
 725 }
 726
 727 void View::determine_time_unit()
 728 {
 729         // Check whether we know the sample rate and hence can use time as the unit
 730         if (time_unit_ == util::TimeUnit::Samples) {
 731                 shared_lock<shared_mutex> lock(session().signals_mutex());
 732                 const unordered_set< shared_ptr<Signal> > &sigs(session().signals());
 733
 734                 // Check all signals but...
 735                 for (const shared_ptr<Signal> signal : sigs) {
 736                         const shared_ptr<SignalData> data = signal->data();
 737
 738                         // ...only check first segment of each
 739                         const vector< shared_ptr<Segment> > segments = data->segments();
 740                         if (!segments.empty())
 741                                 if (segments[0]->samplerate()) {
 742                                         set_time_unit(util::TimeUnit::Time);
 743                                         break;
 744                                 }
 745                 }
 746         }
 747 }
 748
 749 bool View::eventFilter(QObject *object, QEvent *event)
 750 {
 751         const QEvent::Type type = event->type();
 752         if (type == QEvent::MouseMove) {
 753
 754                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
 755                 if (object == viewport_)
 756                         hover_point_ = mouse_event->pos();
 757                 else if (object == ruler_)
 758                         hover_point_ = QPoint(mouse_event->x(), 0);
 759                 else if (object == header_)
 760                         hover_point_ = QPoint(0, mouse_event->y());
 761                 else
 762                         hover_point_ = QPoint(-1, -1);
 763
 764                 hover_point_changed();
 765
 766         } else if (type == QEvent::Leave) {
 767                 hover_point_ = QPoint(-1, -1);
 768                 hover_point_changed();
 769         }
 770
 771         return QObject::eventFilter(object, event);
 772 }
 773
 774 bool View::viewportEvent(QEvent *e)
 775 {
 776         switch(e->type()) {
 777         case QEvent::Paint:
 778         case QEvent::MouseButtonPress:
 779         case QEvent::MouseButtonRelease:
 780         case QEvent::MouseButtonDblClick:
 781         case QEvent::MouseMove:
 782         case QEvent::Wheel:
 783         case QEvent::TouchBegin:
 784         case QEvent::TouchUpdate:
 785         case QEvent::TouchEnd:
 786                 return false;
 787
 788         default:
 789                 return QAbstractScrollArea::viewportEvent(e);
 790         }
 791 }
 792
 793 void View::resizeEvent(QResizeEvent*)
 794 {
 795         update_layout();
 796 }
 797
 798 void View::row_item_appearance_changed(bool label, bool content)
 799 {
 800         if (label)
 801                 header_->update();
 802         if (content)
 803                 viewport_->update();
 804 }
 805
 806 void View::time_item_appearance_changed(bool label, bool content)
 807 {
 808         if (label)
 809                 ruler_->update();
 810         if (content)
 811                 viewport_->update();
 812 }
 813
 814 void View::extents_changed(bool horz, bool vert)
 815 {
 816         sticky_events_ |=
 817                 (horz ? RowItemHExtentsChanged : 0) |
 818                 (vert ? RowItemVExtentsChanged : 0);
 819         lazy_event_handler_.start();
 820 }
 821
 822 void View::h_scroll_value_changed(int value)
 823 {
 824         if (updating_scroll_)
 825                 return;
 826
 827         // Disable sticky scrolling when user moves the horizontal scroll bar
 828         // during a running acquisition
 829         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
 830                 sticky_scrolling_ = false;
 831                 sticky_scrolling_changed(false);
 832         }
 833
 834         const int range = horizontalScrollBar()->maximum();
 835         if (range < MaxScrollValue)
 836                 set_offset(scale_ * value);
 837         else {
 838                 double length = 0;
 839                 Timestamp offset;
 840                 get_scroll_layout(length, offset);
 841                 set_offset(scale_ * length * value / MaxScrollValue);
 842         }
 843
 844         ruler_->update();
 845         viewport_->update();
 846 }
 847
 848 void View::v_scroll_value_changed()
 849 {
 850         header_->update();
 851         viewport_->update();
 852 }
 853
 854 void View::signals_changed()
 855 {
 856         vector< shared_ptr<RowItem> > new_top_level_items;
 857
 858         const auto device = session_.device();
 859         if (!device)
 860                 return;
 861
 862         shared_ptr<sigrok::Device> sr_dev = device->device();
 863         assert(sr_dev);
 864
 865         // Make a list of traces that are being added, and a list of traces
 866         // that are being removed
 867         const set<shared_ptr<Trace>> prev_traces = list_by_type<Trace>();
 868
 869         shared_lock<shared_mutex> lock(session_.signals_mutex());
 870         const unordered_set< shared_ptr<Signal> > &sigs(session_.signals());
 871
 872         set< shared_ptr<Trace> > traces(sigs.begin(), sigs.end());
 873
 874 #ifdef ENABLE_DECODE
 875         const vector< shared_ptr<DecodeTrace> > decode_traces(
 876                 session().get_decode_signals());
 877         traces.insert(decode_traces.begin(), decode_traces.end());
 878 #endif
 879
 880         set< shared_ptr<Trace> > add_traces;
 881         set_difference(traces.begin(), traces.end(),
 882                 prev_traces.begin(), prev_traces.end(),
 883                 inserter(add_traces, add_traces.begin()));
 884
 885         set< shared_ptr<Trace> > remove_traces;
 886         set_difference(prev_traces.begin(), prev_traces.end(),
 887                 traces.begin(), traces.end(),
 888                 inserter(remove_traces, remove_traces.begin()));
 889
 890         // Make a look-up table of sigrok Channels to pulseview Signals
 891         unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 892                 signal_map;
 893         for (const shared_ptr<Signal> &sig : sigs)
 894                 signal_map[sig->channel()] = sig;
 895
 896         // Populate channel groups
 897         for (auto entry : sr_dev->channel_groups())
 898         {
 899                 const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
 900
 901                 if (group->channels().size() <= 1)
 902                         continue;
 903
 904                 // Find best trace group to add to
 905                 RowItemOwner *owner = find_prevalent_trace_group(
 906                         group, signal_map);
 907
 908                 // If there is no trace group, create one
 909                 shared_ptr<TraceGroup> new_trace_group;
 910                 if (!owner) {
 911                         new_trace_group.reset(new TraceGroup());
 912                         owner = new_trace_group.get();
 913                 }
 914
 915                 // Extract traces for the trace group, removing them from
 916                 // the add list
 917                 const vector< shared_ptr<Trace> > new_traces_in_group =
 918                         extract_new_traces_for_channels(group->channels(),
 919                                 signal_map, add_traces);
 920
 921                 // Add the traces to the group
 922                 const pair<int, int> prev_v_extents = owner->v_extents();
 923                 int offset = prev_v_extents.second - prev_v_extents.first;
 924                 for (shared_ptr<Trace> trace : new_traces_in_group) {
 925                         assert(trace);
 926                         owner->add_child_item(trace);
 927
 928                         const pair<int, int> extents = trace->v_extents();
 929                         if (trace->enabled())
 930                                 offset += -extents.first;
 931                         trace->force_to_v_offset(offset);
 932                         if (trace->enabled())
 933                                 offset += extents.second;
 934                 }
 935
 936                 // If this is a new group, enqueue it in the new top level
 937                 // items list
 938                 if (!new_traces_in_group.empty() && new_trace_group)
 939                         new_top_level_items.push_back(new_trace_group);
 940         }
 941
 942         // Enqueue the remaining channels as free ungrouped traces
 943         const vector< shared_ptr<Trace> > new_top_level_signals =
 944                 extract_new_traces_for_channels(sr_dev->channels(),
 945                         signal_map, add_traces);
 946         new_top_level_items.insert(new_top_level_items.end(),
 947                 new_top_level_signals.begin(), new_top_level_signals.end());
 948
 949         // Enqueue any remaining traces i.e. decode traces
 950         new_top_level_items.insert(new_top_level_items.end(),
 951                 add_traces.begin(), add_traces.end());
 952
 953         // Remove any removed traces
 954         for (shared_ptr<Trace> trace : remove_traces) {
 955                 RowItemOwner *const owner = trace->owner();
 956                 assert(owner);
 957                 owner->remove_child_item(trace);
 958         }
 959
 960         // Add and position the pending top levels items
 961         for (auto item : new_top_level_items) {
 962                 add_child_item(item);
 963
 964                 // Position the item after the last present item
 965                 int offset = v_extents().second;
 966                 const pair<int, int> extents = item->v_extents();
 967                 if (item->enabled())
 968                         offset += -extents.first;
 969                 item->force_to_v_offset(offset);
 970                 if (item->enabled())
 971                         offset += extents.second;
 972         }
 973
 974         update_layout();
 975
 976         header_->update();
 977         viewport_->update();
 978 }
 979
 980 void View::capture_state_updated(int state)
 981 {
 982         if (state == Session::Running)
 983                 set_time_unit(util::TimeUnit::Samples);
 984
 985         if (state == Session::Stopped) {
 986                 // After acquisition has stopped we need to re-calculate the ticks once
 987                 // as it's otherwise done when the user pans or zooms, which is too late
 988                 calculate_tick_spacing();
 989
 990                 // Reset "always zoom to fit", the acquisition has stopped
 991                 if (always_zoom_to_fit_) {
 992                         always_zoom_to_fit_ = false;
 993                         always_zoom_to_fit_changed(false);
 994                 }
 995         }
 996 }
 997
 998 void View::data_updated()
 999 {
1000         if (always_zoom_to_fit_ || sticky_scrolling_) {
1001                 if (!delayed_view_updater_.isActive())
1002                         delayed_view_updater_.start();
1003         } else {
1004                 determine_time_unit();
1005                 update_scroll();
1006                 ruler_->update();
1007                 viewport_->update();
1008         }
1009 }
1010
1011 void View::perform_delayed_view_update()
1012 {
1013         if (always_zoom_to_fit_)
1014                 zoom_fit(true);
1015
1016         if (sticky_scrolling_) {
1017                 // Make right side of the view sticky
1018                 double length = 0;
1019                 Timestamp offset;
1020                 get_scroll_layout(length, offset);
1021
1022                 const QSize areaSize = viewport_->size();
1023                 length = max(length - areaSize.width(), 0.0);
1024
1025                 set_offset(scale_ * length);
1026         }
1027
1028         determine_time_unit();
1029         update_scroll();
1030         ruler_->update();
1031         viewport_->update();
1032 }
1033
1034 void View::process_sticky_events()
1035 {
1036         if (sticky_events_ & RowItemHExtentsChanged)
1037                 update_layout();
1038         if (sticky_events_ & RowItemVExtentsChanged) {
1039                 restack_all_row_items();
1040                 update_scroll();
1041         }
1042
1043         // Clear the sticky events
1044         sticky_events_ = 0;
1045 }
1046
1047 void View::on_hover_point_changed()
1048 {
1049         for (shared_ptr<RowItem> r : *this)
1050                 r->hover_point_changed();
1051 }
1052
1053 } // namespace view
1054 } // namespace pv