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