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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifdef ENABLE_DECODE
  21 #include <libsigrokdecode/libsigrokdecode.h>
  22 #endif
  23
  24 #include <extdef.h>
  25
  26 #include <algorithm>
  27 #include <cassert>
  28 #include <climits>
  29 #include <cmath>
  30 #include <iostream>
  31 #include <iterator>
  32 #include <mutex>
  33 #include <unordered_set>
  34
  35 #include <boost/archive/text_iarchive.hpp>
  36 #include <boost/archive/text_oarchive.hpp>
  37 #include <boost/serialization/serialization.hpp>
  38 #include <boost/thread/locks.hpp>
  39
  40 #include <QApplication>
  41 #include <QHBoxLayout>
  42 #include <QEvent>
  43 #include <QFontMetrics>
  44 #include <QMouseEvent>
  45 #include <QScrollBar>
  46
  47 #include <libsigrokcxx/libsigrokcxx.hpp>
  48
  49 #include "analogsignal.hpp"
  50 #include "header.hpp"
  51 #include "logicsignal.hpp"
  52 #include "ruler.hpp"
  53 #include "signal.hpp"
  54 #include "tracegroup.hpp"
  55 #include "triggermarker.hpp"
  56 #include "view.hpp"
  57 #include "viewport.hpp"
  58
  59 #include "pv/session.hpp"
  60 #include "pv/devices/device.hpp"
  61 #include "pv/data/logic.hpp"
  62 #include "pv/data/logicsegment.hpp"
  63 #include "pv/util.hpp"
  64
  65 #ifdef ENABLE_DECODE
  66 #include "decodetrace.hpp"
  67 #endif
  68
  69 using boost::shared_lock;
  70 using boost::shared_mutex;
  71
  72 using pv::data::SignalData;
  73 using pv::data::Segment;
  74 using pv::util::TimeUnit;
  75 using pv::util::Timestamp;
  76
  77 using std::back_inserter;
  78 using std::copy_if;
  79 using std::deque;
  80 using std::dynamic_pointer_cast;
  81 using std::inserter;
  82 using std::list;
  83 using std::lock_guard;
  84 using std::max;
  85 using std::make_pair;
  86 using std::make_shared;
  87 using std::min;
  88 using std::pair;
  89 using std::set;
  90 using std::set_difference;
  91 using std::shared_ptr;
  92 using std::unordered_map;
  93 using std::unordered_set;
  94 using std::vector;
  95 using std::weak_ptr;
  96
  97 namespace pv {
  98 namespace views {
  99 namespace TraceView {
 100
 101 const Timestamp View::MaxScale("1e9");
 102 const Timestamp View::MinScale("1e-12");
 103
 104 const int View::MaxScrollValue = INT_MAX / 2;
 105 const int View::MaxViewAutoUpdateRate = 25; // No more than 25 Hz with sticky scrolling
 106
 107 const int View::ScaleUnits[3] = {1, 2, 5};
 108
 109
 110 CustomAbstractScrollArea::CustomAbstractScrollArea(QWidget *parent) :
 111         QAbstractScrollArea(parent)
 112 {
 113 }
 114
 115 void CustomAbstractScrollArea::setViewportMargins(int left, int top, int right, int bottom)
 116 {
 117         QAbstractScrollArea::setViewportMargins(left, top, right, bottom);
 118 }
 119
 120 bool CustomAbstractScrollArea::viewportEvent(QEvent *event)
 121 {
 122         switch (event->type()) {
 123         case QEvent::Paint:
 124         case QEvent::MouseButtonPress:
 125         case QEvent::MouseButtonRelease:
 126         case QEvent::MouseButtonDblClick:
 127         case QEvent::MouseMove:
 128         case QEvent::Wheel:
 129         case QEvent::TouchBegin:
 130         case QEvent::TouchUpdate:
 131         case QEvent::TouchEnd:
 132                 return false;
 133         default:
 134                 return QAbstractScrollArea::viewportEvent(event);
 135         }
 136 }
 137
 138 View::View(Session &session, QWidget *parent) :
 139         ViewBase(session, parent),
 140         viewport_(new Viewport(*this)),
 141         ruler_(new Ruler(*this)),
 142         header_(new Header(*this)),
 143         scrollarea_(this),
 144         scale_(1e-3),
 145         offset_(0),
 146         updating_scroll_(false),
 147         sticky_scrolling_(false), // Default setting is set in MainWindow::setup_ui()
 148         always_zoom_to_fit_(false),
 149         tick_period_(0),
 150         tick_prefix_(pv::util::SIPrefix::yocto),
 151         tick_precision_(0),
 152         time_unit_(util::TimeUnit::Time),
 153         show_cursors_(false),
 154         cursors_(new CursorPair(*this)),
 155         next_flag_text_('A'),
 156         trigger_markers_(),
 157         hover_point_(-1, -1),
 158         scroll_needs_defaults_(false),
 159         saved_v_offset_(0),
 160         size_finalized_(false)
 161 {
 162         connect(scrollarea_.horizontalScrollBar(), SIGNAL(valueChanged(int)),
 163                 this, SLOT(h_scroll_value_changed(int)));
 164         connect(scrollarea_.verticalScrollBar(), SIGNAL(valueChanged(int)),
 165                 this, SLOT(v_scroll_value_changed()));
 166
 167         connect(header_, SIGNAL(selection_changed()),
 168                 ruler_, SLOT(clear_selection()));
 169         connect(ruler_, SIGNAL(selection_changed()),
 170                 header_, SLOT(clear_selection()));
 171
 172         connect(header_, SIGNAL(selection_changed()),
 173                 this, SIGNAL(selection_changed()));
 174         connect(ruler_, SIGNAL(selection_changed()),
 175                 this, SIGNAL(selection_changed()));
 176
 177         connect(this, SIGNAL(hover_point_changed()),
 178                 this, SLOT(on_hover_point_changed()));
 179
 180         connect(&lazy_event_handler_, SIGNAL(timeout()),
 181                 this, SLOT(process_sticky_events()));
 182         lazy_event_handler_.setSingleShot(true);
 183
 184         connect(&delayed_view_updater_, SIGNAL(timeout()),
 185                 this, SLOT(perform_delayed_view_update()));
 186         delayed_view_updater_.setSingleShot(true);
 187         delayed_view_updater_.setInterval(1000 / MaxViewAutoUpdateRate);
 188
 189         /* To let the scroll area fill up the parent QWidget (this), we need a layout */
 190         QHBoxLayout *layout = new QHBoxLayout(this);
 191         setLayout(layout);
 192         layout->setContentsMargins(0, 0, 0, 0);
 193         layout->addWidget(&scrollarea_);
 194
 195         scrollarea_.setViewport(viewport_);
 196
 197         viewport_->installEventFilter(this);
 198         ruler_->installEventFilter(this);
 199         header_->installEventFilter(this);
 200
 201         // Trigger the initial event manually. The default device has signals
 202         // which were created before this object came into being
 203         signals_changed();
 204
 205         // make sure the transparent widgets are on the top
 206         ruler_->raise();
 207         header_->raise();
 208
 209         // Update the zoom state
 210         calculate_tick_spacing();
 211 }
 212
 213 Session& View::session()
 214 {
 215         return session_;
 216 }
 217
 218 const Session& View::session() const
 219 {
 220         return session_;
 221 }
 222
 223 std::unordered_set< std::shared_ptr<Signal> > View::signals() const
 224 {
 225         return signals_;
 226 }
 227
 228 void View::clear_signals()
 229 {
 230         signals_.clear();
 231 }
 232
 233 void View::add_signal(const shared_ptr<Signal> signal)
 234 {
 235         signals_.insert(signal);
 236 }
 237
 238 #ifdef ENABLE_DECODE
 239 void View::clear_decode_signals()
 240 {
 241         decode_traces_.clear();
 242 }
 243
 244 void View::add_decode_signal(shared_ptr<data::SignalBase> signalbase)
 245 {
 246         shared_ptr<DecodeTrace> d(
 247                 new DecodeTrace(session_, signalbase, decode_traces_.size()));
 248         decode_traces_.push_back(d);
 249 }
 250
 251 void View::remove_decode_signal(shared_ptr<data::SignalBase> signalbase)
 252 {
 253         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 254                 if ((*i)->base() == signalbase) {
 255                         decode_traces_.erase(i);
 256                         signals_changed();
 257                         return;
 258                 }
 259 }
 260 #endif
 261
 262 View* View::view()
 263 {
 264         return this;
 265 }
 266
 267 const View* View::view() const
 268 {
 269         return this;
 270 }
 271
 272 Viewport* View::viewport()
 273 {
 274         return viewport_;
 275 }
 276
 277 const Viewport* View::viewport() const
 278 {
 279         return viewport_;
 280 }
 281
 282 void View::save_settings(QSettings &settings) const
 283 {
 284         settings.setValue("scale", scale_);
 285         settings.setValue("v_offset",
 286                 scrollarea_.verticalScrollBar()->sliderPosition());
 287
 288         std::stringstream ss;
 289         boost::archive::text_oarchive oa(ss);
 290         oa << boost::serialization::make_nvp("offset", offset_);
 291         settings.setValue("offset", QString::fromStdString(ss.str()));
 292
 293         for (shared_ptr<Signal> signal : signals_) {
 294                 settings.beginGroup(signal->base()->internal_name());
 295                 signal->save_settings(settings);
 296                 settings.endGroup();
 297         }
 298 }
 299
 300 void View::restore_settings(QSettings &settings)
 301 {
 302         // Note: It is assumed that this function is only called once,
 303         // immediately after restoring a previous session.
 304
 305         if (settings.contains("scale"))
 306                 set_scale(settings.value("scale").toDouble());
 307
 308         if (settings.contains("offset")) {
 309                 util::Timestamp offset;
 310                 std::stringstream ss;
 311                 ss << settings.value("offset").toString().toStdString();
 312
 313                 boost::archive::text_iarchive ia(ss);
 314                 ia >> boost::serialization::make_nvp("offset", offset);
 315
 316                 set_offset(offset);
 317         }
 318
 319         for (shared_ptr<Signal> signal : signals_) {
 320                 settings.beginGroup(signal->base()->internal_name());
 321                 signal->restore_settings(settings);
 322                 settings.endGroup();
 323         }
 324
 325         if (settings.contains("v_offset")) {
 326                 saved_v_offset_ = settings.value("v_offset").toInt();
 327                 set_v_offset(saved_v_offset_);
 328                 scroll_needs_defaults_ = false;
 329                 // Note: see resizeEvent() for additional information
 330         }
 331 }
 332
 333 vector< shared_ptr<TimeItem> > View::time_items() const
 334 {
 335         const vector<shared_ptr<Flag>> f(flags());
 336         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 337         items.push_back(cursors_);
 338         items.push_back(cursors_->first());
 339         items.push_back(cursors_->second());
 340
 341         for (auto trigger_marker : trigger_markers_)
 342                 items.push_back(trigger_marker);
 343
 344         return items;
 345 }
 346
 347 double View::scale() const
 348 {
 349         return scale_;
 350 }
 351
 352 void View::set_scale(double scale)
 353 {
 354         if (scale_ != scale) {
 355                 scale_ = scale;
 356                 Q_EMIT scale_changed();
 357         }
 358 }
 359
 360 const Timestamp& View::offset() const
 361 {
 362         return offset_;
 363 }
 364
 365 void View::set_offset(const pv::util::Timestamp& offset)
 366 {
 367         if (offset_ != offset) {
 368                 offset_ = offset;
 369                 Q_EMIT offset_changed();
 370         }
 371 }
 372
 373 int View::owner_visual_v_offset() const
 374 {
 375         return -scrollarea_.verticalScrollBar()->sliderPosition();
 376 }
 377
 378 void View::set_v_offset(int offset)
 379 {
 380         scrollarea_.verticalScrollBar()->setSliderPosition(offset);
 381         header_->update();
 382         viewport_->update();
 383 }
 384
 385 unsigned int View::depth() const
 386 {
 387         return 0;
 388 }
 389
 390 pv::util::SIPrefix View::tick_prefix() const
 391 {
 392         return tick_prefix_;
 393 }
 394
 395 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 396 {
 397         if (tick_prefix_ != tick_prefix) {
 398                 tick_prefix_ = tick_prefix;
 399                 Q_EMIT tick_prefix_changed();
 400         }
 401 }
 402
 403 unsigned int View::tick_precision() const
 404 {
 405         return tick_precision_;
 406 }
 407
 408 void View::set_tick_precision(unsigned tick_precision)
 409 {
 410         if (tick_precision_ != tick_precision) {
 411                 tick_precision_ = tick_precision;
 412                 Q_EMIT tick_precision_changed();
 413         }
 414 }
 415
 416 const pv::util::Timestamp& View::tick_period() const
 417 {
 418         return tick_period_;
 419 }
 420
 421 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 422 {
 423         if (tick_period_ != tick_period) {
 424                 tick_period_ = tick_period;
 425                 Q_EMIT tick_period_changed();
 426         }
 427 }
 428
 429 TimeUnit View::time_unit() const
 430 {
 431         return time_unit_;
 432 }
 433
 434 void View::set_time_unit(pv::util::TimeUnit time_unit)
 435 {
 436         if (time_unit_ != time_unit) {
 437                 time_unit_ = time_unit;
 438                 Q_EMIT time_unit_changed();
 439         }
 440 }
 441
 442 void View::zoom(double steps)
 443 {
 444         zoom(steps, viewport_->width() / 2);
 445 }
 446
 447 void View::zoom(double steps, int offset)
 448 {
 449         set_zoom(scale_ * pow(3.0/2.0, -steps), offset);
 450 }
 451
 452 void View::zoom_fit(bool gui_state)
 453 {
 454         // Act as one-shot when stopped, toggle along with the GUI otherwise
 455         if (session_.get_capture_state() == Session::Stopped) {
 456                 always_zoom_to_fit_ = false;
 457                 always_zoom_to_fit_changed(false);
 458         } else {
 459                 always_zoom_to_fit_ = gui_state;
 460                 always_zoom_to_fit_changed(gui_state);
 461         }
 462
 463         const pair<Timestamp, Timestamp> extents = get_time_extents();
 464         const Timestamp delta = extents.second - extents.first;
 465         if (delta < Timestamp("1e-12"))
 466                 return;
 467
 468         assert(viewport_);
 469         const int w = viewport_->width();
 470         if (w <= 0)
 471                 return;
 472
 473         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 474         set_scale_offset(scale.convert_to<double>(), extents.first);
 475 }
 476
 477 void View::zoom_one_to_one()
 478 {
 479         using pv::data::SignalData;
 480
 481         // Make a set of all the visible data objects
 482         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 483         if (visible_data.empty())
 484                 return;
 485
 486         assert(viewport_);
 487         const int w = viewport_->width();
 488         if (w <= 0)
 489                 return;
 490
 491         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 492 }
 493
 494 void View::set_scale_offset(double scale, const Timestamp& offset)
 495 {
 496         // Disable sticky scrolling / always zoom to fit when acquisition runs
 497         // and user drags the viewport
 498         if ((scale_ == scale) && (offset_ != offset) &&
 499                         (session_.get_capture_state() == Session::Running)) {
 500
 501                 if (sticky_scrolling_) {
 502                         sticky_scrolling_ = false;
 503                         sticky_scrolling_changed(false);
 504                 }
 505
 506                 if (always_zoom_to_fit_) {
 507                         always_zoom_to_fit_ = false;
 508                         always_zoom_to_fit_changed(false);
 509                 }
 510         }
 511
 512         set_scale(scale);
 513         set_offset(offset);
 514
 515         calculate_tick_spacing();
 516
 517         update_scroll();
 518         ruler_->update();
 519         viewport_->update();
 520 }
 521
 522 set< shared_ptr<SignalData> > View::get_visible_data() const
 523 {
 524         // Make a set of all the visible data objects
 525         set< shared_ptr<SignalData> > visible_data;
 526         for (const shared_ptr<Signal> sig : signals_)
 527                 if (sig->enabled())
 528                         visible_data.insert(sig->data());
 529
 530         return visible_data;
 531 }
 532
 533 pair<Timestamp, Timestamp> View::get_time_extents() const
 534 {
 535         boost::optional<Timestamp> left_time, right_time;
 536         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 537         for (const shared_ptr<SignalData> d : visible_data) {
 538                 const vector< shared_ptr<Segment> > segments =
 539                         d->segments();
 540                 for (const shared_ptr<Segment> &s : segments) {
 541                         double samplerate = s->samplerate();
 542                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 543
 544                         const Timestamp start_time = s->start_time();
 545                         left_time = left_time ?
 546                                 min(*left_time, start_time) :
 547                                                 start_time;
 548                         right_time = right_time ?
 549                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 550                                                  start_time + d->max_sample_count() / samplerate;
 551                 }
 552         }
 553
 554         if (!left_time || !right_time)
 555                 return make_pair(0, 0);
 556
 557         assert(*left_time < *right_time);
 558         return make_pair(*left_time, *right_time);
 559 }
 560
 561 void View::enable_sticky_scrolling(bool state)
 562 {
 563         sticky_scrolling_ = state;
 564 }
 565
 566 void View::enable_coloured_bg(bool state)
 567 {
 568         const vector<shared_ptr<TraceTreeItem>> items(
 569                 list_by_type<TraceTreeItem>());
 570
 571         for (shared_ptr<TraceTreeItem> i : items) {
 572                 // Can't cast to Trace because it's abstract, so we need to
 573                 // check for any derived classes individually
 574
 575                 shared_ptr<AnalogSignal> a = dynamic_pointer_cast<AnalogSignal>(i);
 576                 if (a)
 577                         a->set_coloured_bg(state);
 578
 579                 shared_ptr<LogicSignal> l = dynamic_pointer_cast<LogicSignal>(i);
 580                 if (l)
 581                         l->set_coloured_bg(state);
 582
 583 #ifdef ENABLE_DECODE
 584                 shared_ptr<DecodeTrace> d = dynamic_pointer_cast<DecodeTrace>(i);
 585                 if (d)
 586                         d->set_coloured_bg(state);
 587 #endif
 588         }
 589
 590         viewport_->update();
 591 }
 592
 593 bool View::cursors_shown() const
 594 {
 595         return show_cursors_;
 596 }
 597
 598 void View::show_cursors(bool show)
 599 {
 600         show_cursors_ = show;
 601         ruler_->update();
 602         viewport_->update();
 603 }
 604
 605 void View::centre_cursors()
 606 {
 607         const double time_width = scale_ * viewport_->width();
 608         cursors_->first()->set_time(offset_ + time_width * 0.4);
 609         cursors_->second()->set_time(offset_ + time_width * 0.6);
 610         ruler_->update();
 611         viewport_->update();
 612 }
 613
 614 std::shared_ptr<CursorPair> View::cursors() const
 615 {
 616         return cursors_;
 617 }
 618
 619 void View::add_flag(const Timestamp& time)
 620 {
 621         flags_.push_back(shared_ptr<Flag>(new Flag(*this, time,
 622                 QString("%1").arg(next_flag_text_))));
 623
 624         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 625                 (next_flag_text_ + 1);
 626
 627         time_item_appearance_changed(true, true);
 628 }
 629
 630 void View::remove_flag(std::shared_ptr<Flag> flag)
 631 {
 632         flags_.remove(flag);
 633         time_item_appearance_changed(true, true);
 634 }
 635
 636 vector< std::shared_ptr<Flag> > View::flags() const
 637 {
 638         vector< std::shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 639         stable_sort(flags.begin(), flags.end(),
 640                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 641                         return a->time() < b->time();
 642                 });
 643
 644         return flags;
 645 }
 646
 647 const QPoint& View::hover_point() const
 648 {
 649         return hover_point_;
 650 }
 651
 652 void View::restack_all_trace_tree_items()
 653 {
 654         // Make a list of owners that is sorted from deepest first
 655         const vector<shared_ptr<TraceTreeItem>> items(
 656                 list_by_type<TraceTreeItem>());
 657         set< TraceTreeItemOwner* > owners;
 658         for (const auto &r : items)
 659                 owners.insert(r->owner());
 660         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 661         sort(sorted_owners.begin(), sorted_owners.end(),
 662                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 663                         return a->depth() > b->depth(); });
 664
 665         // Restack the items recursively
 666         for (auto &o : sorted_owners)
 667                 o->restack_items();
 668
 669         // Re-assign background colors
 670         bool next_bgcolour_state = 0;
 671
 672         for (auto &o : sorted_owners)
 673                 next_bgcolour_state = o->reassign_bgcolour_states(next_bgcolour_state);
 674
 675         // Animate the items to their destination
 676         for (const auto &i : items)
 677                 i->animate_to_layout_v_offset();
 678 }
 679
 680 void View::trigger_event(util::Timestamp location)
 681 {
 682         trigger_markers_.push_back(shared_ptr<TriggerMarker>(
 683                 new TriggerMarker(*this, location)));
 684 }
 685
 686 void View::get_scroll_layout(double &length, Timestamp &offset) const
 687 {
 688         const pair<Timestamp, Timestamp> extents = get_time_extents();
 689         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 690         offset = offset_ / scale_;
 691 }
 692
 693 void View::set_zoom(double scale, int offset)
 694 {
 695         // Reset the "always zoom to fit" feature as the user changed the zoom
 696         always_zoom_to_fit_ = false;
 697         always_zoom_to_fit_changed(false);
 698
 699         const Timestamp cursor_offset = offset_ + scale_ * offset;
 700         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 701         const Timestamp new_offset = cursor_offset - new_scale * offset;
 702         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 703 }
 704
 705 void View::calculate_tick_spacing()
 706 {
 707         const double SpacingIncrement = 10.0f;
 708         const double MinValueSpacing = 40.0f;
 709
 710         // Figure out the highest numeric value visible on a label
 711         const QSize areaSize = viewport_->size();
 712         const Timestamp max_time = max(fabs(offset_),
 713                 fabs(offset_ + scale_ * areaSize.width()));
 714
 715         double min_width = SpacingIncrement;
 716         double label_width, tick_period_width;
 717
 718         QFontMetrics m(QApplication::font());
 719
 720         // Copies of the member variables with the same name, used in the calculation
 721         // and written back afterwards, so that we don't emit signals all the time
 722         // during the calculation.
 723         pv::util::Timestamp tick_period = tick_period_;
 724         pv::util::SIPrefix tick_prefix = tick_prefix_;
 725         unsigned tick_precision = tick_precision_;
 726
 727         do {
 728                 const double min_period = scale_ * min_width;
 729
 730                 const int order = (int)floorf(log10f(min_period));
 731                 const pv::util::Timestamp order_decimal =
 732                         pow(pv::util::Timestamp(10), order);
 733
 734                 // Allow for a margin of error so that a scale unit of 1 can be used.
 735                 // Otherwise, for a SU of 1 the tick period will almost always be below
 736                 // the min_period by a small amount - and thus skipped in favor of 2.
 737                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 738                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 739                 double tp_with_margin;
 740                 unsigned int unit = 0;
 741
 742                 do {
 743                         tp_with_margin = order_decimal.convert_to<double>() *
 744                                 (ScaleUnits[unit++] + tp_margin);
 745                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 746
 747                 tick_period = order_decimal * ScaleUnits[unit - 1];
 748                 tick_prefix = static_cast<pv::util::SIPrefix>(
 749                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 750
 751                 // Precision is the number of fractional digits required, not
 752                 // taking the prefix into account (and it must never be negative)
 753                 tick_precision = std::max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 754
 755                 tick_period_width = (tick_period / scale_).convert_to<double>();
 756
 757                 const QString label_text = Ruler::format_time_with_distance(
 758                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 759
 760                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 761                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 762                                 MinValueSpacing;
 763
 764                 min_width += SpacingIncrement;
 765         } while (tick_period_width < label_width);
 766
 767         set_tick_period(tick_period);
 768         set_tick_prefix(tick_prefix);
 769         set_tick_precision(tick_precision);
 770 }
 771
 772 void View::update_scroll()
 773 {
 774         assert(viewport_);
 775         QScrollBar *hscrollbar = scrollarea_.horizontalScrollBar();
 776         QScrollBar *vscrollbar = scrollarea_.verticalScrollBar();
 777
 778         const QSize areaSize = viewport_->size();
 779
 780         // Set the horizontal scroll bar
 781         double length = 0;
 782         Timestamp offset;
 783         get_scroll_layout(length, offset);
 784         length = max(length - areaSize.width(), 0.0);
 785
 786         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
 787
 788         hscrollbar->setPageStep(areaSize.width() / 2);
 789         hscrollbar->setSingleStep(major_tick_distance);
 790
 791         updating_scroll_ = true;
 792
 793         if (length < MaxScrollValue) {
 794                 hscrollbar->setRange(0, length);
 795                 hscrollbar->setSliderPosition(offset.convert_to<double>());
 796         } else {
 797                 hscrollbar->setRange(0, MaxScrollValue);
 798                 hscrollbar->setSliderPosition(
 799                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
 800         }
 801
 802         updating_scroll_ = false;
 803
 804         // Set the vertical scrollbar
 805         vscrollbar->setPageStep(areaSize.height());
 806         vscrollbar->setSingleStep(areaSize.height() / 8);
 807
 808         const pair<int, int> extents = v_extents();
 809
 810         // Don't change the scrollbar range if there are no traces
 811         if (extents.first != extents.second)
 812                 vscrollbar->setRange(extents.first - areaSize.height(),
 813                         extents.second);
 814
 815         if (scroll_needs_defaults_)
 816                 set_scroll_default();
 817 }
 818
 819 void View::reset_scroll()
 820 {
 821         scrollarea_.verticalScrollBar()->setRange(0, 0);
 822 }
 823
 824 void View::set_scroll_default()
 825 {
 826         assert(viewport_);
 827
 828         const QSize areaSize = viewport_->size();
 829
 830         // Special case: when starting up and the window isn't visible yet,
 831         // areaSize is [0, 0]. In this case we want to be called again later
 832         if ((areaSize.height() == 0) || (!size_finalized_)) {
 833                 scroll_needs_defaults_ = true;
 834                 return;
 835         } else {
 836                 scroll_needs_defaults_ = false;
 837         }
 838
 839         const pair<int, int> extents = v_extents();
 840         const int trace_height = extents.second - extents.first;
 841
 842         // Do all traces fit in the view?
 843         if (areaSize.height() >= trace_height)
 844                 // Center all traces vertically
 845                 set_v_offset(extents.first -
 846                         ((areaSize.height() - trace_height) / 2));
 847         else
 848                 // Put the first trace at the top, letting the bottom ones overflow
 849                 set_v_offset(extents.first);
 850 }
 851
 852 void View::update_layout()
 853 {
 854         scrollarea_.setViewportMargins(
 855                 header_->sizeHint().width() - Header::BaselineOffset,
 856                 ruler_->sizeHint().height(), 0, 0);
 857         ruler_->setGeometry(viewport_->x(), 0,
 858                 viewport_->width(), ruler_->extended_size_hint().height());
 859         header_->setGeometry(0, viewport_->y(),
 860                 header_->extended_size_hint().width(), viewport_->height());
 861         update_scroll();
 862 }
 863
 864 TraceTreeItemOwner* View::find_prevalent_trace_group(
 865         const shared_ptr<sigrok::ChannelGroup> &group,
 866         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
 867                 &signal_map)
 868 {
 869         assert(group);
 870
 871         unordered_set<TraceTreeItemOwner*> owners;
 872         vector<TraceTreeItemOwner*> owner_list;
 873
 874         // Make a set and a list of all the owners
 875         for (const auto &channel : group->channels()) {
 876                 for (auto entry : signal_map) {
 877                         if (entry.first->channel() == channel) {
 878                                 TraceTreeItemOwner *const o = (entry.second)->owner();
 879                                 owner_list.push_back(o);
 880                                 owners.insert(o);
 881                         }
 882                 }
 883         }
 884
 885         // Iterate through the list of owners, and find the most prevalent
 886         size_t max_prevalence = 0;
 887         TraceTreeItemOwner *prevalent_owner = nullptr;
 888         for (TraceTreeItemOwner *owner : owners) {
 889                 const size_t prevalence = std::count_if(
 890                         owner_list.begin(), owner_list.end(),
 891                         [&](TraceTreeItemOwner *o) { return o == owner; });
 892                 if (prevalence > max_prevalence) {
 893                         max_prevalence = prevalence;
 894                         prevalent_owner = owner;
 895                 }
 896         }
 897
 898         return prevalent_owner;
 899 }
 900
 901 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
 902         const vector< shared_ptr<sigrok::Channel> > &channels,
 903         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
 904                 &signal_map,
 905         set< shared_ptr<Trace> > &add_list)
 906 {
 907         vector< shared_ptr<Trace> > filtered_traces;
 908
 909         for (const auto &channel : channels) {
 910                 for (auto entry : signal_map) {
 911                         if (entry.first->channel() == channel) {
 912                                 shared_ptr<Trace> trace = entry.second;
 913                                 const auto list_iter = add_list.find(trace);
 914                                 if (list_iter == add_list.end())
 915                                         continue;
 916
 917                                 filtered_traces.push_back(trace);
 918                                 add_list.erase(list_iter);
 919                         }
 920                 }
 921         }
 922
 923         return filtered_traces;
 924 }
 925
 926 void View::determine_time_unit()
 927 {
 928         // Check whether we know the sample rate and hence can use time as the unit
 929         if (time_unit_ == util::TimeUnit::Samples) {
 930                 // Check all signals but...
 931                 for (const shared_ptr<Signal> signal : signals_) {
 932                         const shared_ptr<SignalData> data = signal->data();
 933
 934                         // ...only check first segment of each
 935                         const vector< shared_ptr<Segment> > segments = data->segments();
 936                         if (!segments.empty())
 937                                 if (segments[0]->samplerate()) {
 938                                         set_time_unit(util::TimeUnit::Time);
 939                                         break;
 940                                 }
 941                 }
 942         }
 943 }
 944
 945 bool View::eventFilter(QObject *object, QEvent *event)
 946 {
 947         const QEvent::Type type = event->type();
 948         if (type == QEvent::MouseMove) {
 949
 950                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
 951                 if (object == viewport_)
 952                         hover_point_ = mouse_event->pos();
 953                 else if (object == ruler_)
 954                         hover_point_ = QPoint(mouse_event->x(), 0);
 955                 else if (object == header_)
 956                         hover_point_ = QPoint(0, mouse_event->y());
 957                 else
 958                         hover_point_ = QPoint(-1, -1);
 959
 960                 hover_point_changed();
 961
 962         } else if (type == QEvent::Leave) {
 963                 hover_point_ = QPoint(-1, -1);
 964                 hover_point_changed();
 965         }
 966
 967         return QObject::eventFilter(object, event);
 968 }
 969
 970 void View::resizeEvent(QResizeEvent*)
 971 {
 972         update_layout();
 973
 974         // This is somewhat of a hack, unfortunately. We cannot use
 975         // set_v_offset() from within restore_settings() as the view
 976         // at that point is neither visible nor properly sized.
 977         // This is the least intrusive workaround I could come up
 978         // with: set the vertical offset (or scroll defaults) when
 979         // the view is visible and resized to its final size.
 980         // Resize events that are sent when the view is not visible
 981         // must be ignored as they have wrong sizes, potentially
 982         // preventing the v offset from being set successfully.
 983
 984         if (isVisible())
 985                 size_finalized_ = true;
 986
 987         if (size_finalized_ && saved_v_offset_) {
 988                 set_v_offset(saved_v_offset_);
 989                 saved_v_offset_ = 0;
 990         }
 991
 992         if (size_finalized_ && scroll_needs_defaults_)
 993                 set_scroll_default();
 994 }
 995
 996 void View::row_item_appearance_changed(bool label, bool content)
 997 {
 998         if (label)
 999                 header_->update();
1000         if (content)
1001                 viewport_->update();
1002 }
1003
1004 void View::time_item_appearance_changed(bool label, bool content)
1005 {
1006         if (label)
1007                 ruler_->update();
1008         if (content)
1009                 viewport_->update();
1010 }
1011
1012 void View::extents_changed(bool horz, bool vert)
1013 {
1014         sticky_events_ |=
1015                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1016                 (vert ? TraceTreeItemVExtentsChanged : 0);
1017         lazy_event_handler_.start();
1018 }
1019
1020 void View::h_scroll_value_changed(int value)
1021 {
1022         if (updating_scroll_)
1023                 return;
1024
1025         // Disable sticky scrolling when user moves the horizontal scroll bar
1026         // during a running acquisition
1027         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1028                 sticky_scrolling_ = false;
1029                 sticky_scrolling_changed(false);
1030         }
1031
1032         const int range = scrollarea_.horizontalScrollBar()->maximum();
1033         if (range < MaxScrollValue)
1034                 set_offset(scale_ * value);
1035         else {
1036                 double length = 0;
1037                 Timestamp offset;
1038                 get_scroll_layout(length, offset);
1039                 set_offset(scale_ * length * value / MaxScrollValue);
1040         }
1041
1042         ruler_->update();
1043         viewport_->update();
1044 }
1045
1046 void View::v_scroll_value_changed()
1047 {
1048         header_->update();
1049         viewport_->update();
1050 }
1051
1052 void View::signals_changed()
1053 {
1054         using sigrok::Channel;
1055
1056         vector< shared_ptr<Channel> > channels;
1057         shared_ptr<sigrok::Device> sr_dev;
1058
1059         // Do we need to set the vertical scrollbar to its default position later?
1060         // We do if there are no traces, i.e. the scroll bar has no range set
1061         bool reset_scrollbar =
1062                 (scrollarea_.verticalScrollBar()->minimum() ==
1063                         scrollarea_.verticalScrollBar()->maximum());
1064
1065         if (!session_.device()) {
1066                 reset_scroll();
1067                 signals_.clear();
1068         } else {
1069                 sr_dev = session_.device()->device();
1070                 assert(sr_dev);
1071                 channels = sr_dev->channels();
1072         }
1073
1074         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1075
1076         // Make a list of traces that are being added, and a list of traces
1077         // that are being removed
1078         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1079         const set<shared_ptr<Trace>> prev_traces(
1080                 prev_trace_list.begin(), prev_trace_list.end());
1081
1082         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1083
1084 #ifdef ENABLE_DECODE
1085         traces.insert(decode_traces_.begin(), decode_traces_.end());
1086 #endif
1087
1088         set< shared_ptr<Trace> > add_traces;
1089         set_difference(traces.begin(), traces.end(),
1090                 prev_traces.begin(), prev_traces.end(),
1091                 inserter(add_traces, add_traces.begin()));
1092
1093         set< shared_ptr<Trace> > remove_traces;
1094         set_difference(prev_traces.begin(), prev_traces.end(),
1095                 traces.begin(), traces.end(),
1096                 inserter(remove_traces, remove_traces.begin()));
1097
1098         // Make a look-up table of sigrok Channels to pulseview Signals
1099         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1100                 signal_map;
1101         for (const shared_ptr<Signal> &sig : signals_)
1102                 signal_map[sig->base()] = sig;
1103
1104         // Populate channel groups
1105         if (sr_dev)
1106                 for (auto entry : sr_dev->channel_groups()) {
1107                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1108
1109                         if (group->channels().size() <= 1)
1110                                 continue;
1111
1112                         // Find best trace group to add to
1113                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1114                                 group, signal_map);
1115
1116                         // If there is no trace group, create one
1117                         shared_ptr<TraceGroup> new_trace_group;
1118                         if (!owner) {
1119                                 new_trace_group.reset(new TraceGroup());
1120                                 owner = new_trace_group.get();
1121                         }
1122
1123                         // Extract traces for the trace group, removing them from
1124                         // the add list
1125                         const vector< shared_ptr<Trace> > new_traces_in_group =
1126                                 extract_new_traces_for_channels(group->channels(),
1127                                         signal_map, add_traces);
1128
1129                         // Add the traces to the group
1130                         const pair<int, int> prev_v_extents = owner->v_extents();
1131                         int offset = prev_v_extents.second - prev_v_extents.first;
1132                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1133                                 assert(trace);
1134                                 owner->add_child_item(trace);
1135
1136                                 const pair<int, int> extents = trace->v_extents();
1137                                 if (trace->enabled())
1138                                         offset += -extents.first;
1139                                 trace->force_to_v_offset(offset);
1140                                 if (trace->enabled())
1141                                         offset += extents.second;
1142                         }
1143
1144                         if (new_trace_group) {
1145                                 // Assign proper vertical offsets to each channel in the group
1146                                 new_trace_group->restack_items();
1147
1148                                 // If this is a new group, enqueue it in the new top level
1149                                 // items list
1150                                 if (!new_traces_in_group.empty())
1151                                         new_top_level_items.push_back(new_trace_group);
1152                         }
1153                 }
1154
1155         // Enqueue the remaining logic channels in a group
1156         vector< shared_ptr<Channel> > logic_channels;
1157         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1158                 [](const shared_ptr<Channel>& c) {
1159                         return c->type() == sigrok::ChannelType::LOGIC; });
1160
1161         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1162                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1163
1164         if (non_grouped_logic_signals.size() > 0) {
1165                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1166                         make_shared<TraceGroup>());
1167                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1168                         non_grouped_trace_group->add_child_item(trace);
1169
1170                 non_grouped_trace_group->restack_items();
1171                 new_top_level_items.push_back(non_grouped_trace_group);
1172         }
1173
1174         // Enqueue the remaining channels as free ungrouped traces
1175         const vector< shared_ptr<Trace> > new_top_level_signals =
1176                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1177         new_top_level_items.insert(new_top_level_items.end(),
1178                 new_top_level_signals.begin(), new_top_level_signals.end());
1179
1180         // Enqueue any remaining traces i.e. decode traces
1181         new_top_level_items.insert(new_top_level_items.end(),
1182                 add_traces.begin(), add_traces.end());
1183
1184         // Remove any removed traces
1185         for (shared_ptr<Trace> trace : remove_traces) {
1186                 TraceTreeItemOwner *const owner = trace->owner();
1187                 assert(owner);
1188                 owner->remove_child_item(trace);
1189         }
1190
1191         // Remove any empty trace groups
1192         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1193                 if (group->child_items().size() == 0) {
1194                         remove_child_item(group);
1195                         group.reset();
1196                 }
1197
1198         // Add and position the pending top levels items
1199         for (auto item : new_top_level_items) {
1200                 add_child_item(item);
1201
1202                 // Position the item after the last item or at the top if there is none
1203                 int offset = v_extents().second;
1204                 const pair<int, int> extents = item->v_extents();
1205
1206                 if (item->enabled())
1207                         offset += -extents.first;
1208
1209                 item->force_to_v_offset(offset);
1210
1211                 if (item->enabled())
1212                         offset += extents.second;
1213         }
1214
1215         update_layout();
1216
1217         header_->update();
1218         viewport_->update();
1219
1220         if (reset_scrollbar)
1221                 set_scroll_default();
1222 }
1223
1224 void View::capture_state_updated(int state)
1225 {
1226         if (state == Session::Running) {
1227                 set_time_unit(util::TimeUnit::Samples);
1228
1229                 trigger_markers_.clear();
1230         }
1231
1232         if (state == Session::Stopped) {
1233                 // After acquisition has stopped we need to re-calculate the ticks once
1234                 // as it's otherwise done when the user pans or zooms, which is too late
1235                 calculate_tick_spacing();
1236
1237                 // Reset "always zoom to fit", the acquisition has stopped
1238                 if (always_zoom_to_fit_) {
1239                         always_zoom_to_fit_ = false;
1240                         always_zoom_to_fit_changed(false);
1241                 }
1242         }
1243 }
1244
1245 void View::data_updated()
1246 {
1247         if (always_zoom_to_fit_ || sticky_scrolling_) {
1248                 if (!delayed_view_updater_.isActive())
1249                         delayed_view_updater_.start();
1250         } else {
1251                 determine_time_unit();
1252                 update_scroll();
1253                 ruler_->update();
1254                 viewport_->update();
1255         }
1256 }
1257
1258 void View::perform_delayed_view_update()
1259 {
1260         if (always_zoom_to_fit_)
1261                 zoom_fit(true);
1262
1263         if (sticky_scrolling_) {
1264                 // Make right side of the view sticky
1265                 double length = 0;
1266                 Timestamp offset;
1267                 get_scroll_layout(length, offset);
1268
1269                 const QSize areaSize = viewport_->size();
1270                 length = max(length - areaSize.width(), 0.0);
1271
1272                 set_offset(scale_ * length);
1273         }
1274
1275         determine_time_unit();
1276         update_scroll();
1277         ruler_->update();
1278         viewport_->update();
1279 }
1280
1281 void View::process_sticky_events()
1282 {
1283         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1284                 update_layout();
1285         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1286                 restack_all_trace_tree_items();
1287                 update_scroll();
1288         }
1289
1290         // Clear the sticky events
1291         sticky_events_ = 0;
1292 }
1293
1294 void View::on_hover_point_changed()
1295 {
1296         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1297                 list_by_type<TraceTreeItem>());
1298         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1299                 r->hover_point_changed();
1300 }
1301
1302 } // namespace TraceView
1303 } // namespace views
1304 } // namespace pv