pv/views/trace/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 <unordered_set>
  33
  34 #include <boost/archive/text_iarchive.hpp>
  35 #include <boost/archive/text_oarchive.hpp>
  36 #include <boost/serialization/serialization.hpp>
  37
  38 #include <QApplication>
  39 #include <QEvent>
  40 #include <QFontMetrics>
  41 #include <QMouseEvent>
  42 #include <QScrollBar>
  43 #include <QVBoxLayout>
  44
  45 #include <libsigrokcxx/libsigrokcxx.hpp>
  46
  47 #include "analogsignal.hpp"
  48 #include "header.hpp"
  49 #include "logicsignal.hpp"
  50 #include "ruler.hpp"
  51 #include "signal.hpp"
  52 #include "tracegroup.hpp"
  53 #include "triggermarker.hpp"
  54 #include "view.hpp"
  55 #include "viewport.hpp"
  56
  57 #include "pv/data/logic.hpp"
  58 #include "pv/data/logicsegment.hpp"
  59 #include "pv/devices/device.hpp"
  60 #include "pv/globalsettings.hpp"
  61 #include "pv/session.hpp"
  62 #include "pv/util.hpp"
  63
  64 #ifdef ENABLE_DECODE
  65 #include "decodetrace.hpp"
  66 #endif
  67
  68 using pv::data::SignalData;
  69 using pv::data::Segment;
  70 using pv::util::TimeUnit;
  71 using pv::util::Timestamp;
  72
  73 using std::back_inserter;
  74 using std::copy_if;
  75 using std::count_if;
  76 using std::dynamic_pointer_cast;
  77 using std::inserter;
  78 using std::max;
  79 using std::make_pair;
  80 using std::make_shared;
  81 using std::min;
  82 using std::pair;
  83 using std::set;
  84 using std::set_difference;
  85 using std::shared_ptr;
  86 using std::stringstream;
  87 using std::unordered_map;
  88 using std::unordered_set;
  89 using std::vector;
  90
  91 namespace pv {
  92 namespace views {
  93 namespace trace {
  94
  95 const Timestamp View::MaxScale("1e9");
  96 const Timestamp View::MinScale("1e-12");
  97
  98 const int View::MaxScrollValue = INT_MAX / 2;
  99
 100 const int View::ScaleUnits[3] = {1, 2, 5};
 101
 102
 103 CustomScrollArea::CustomScrollArea(QWidget *parent) :
 104         QAbstractScrollArea(parent)
 105 {
 106 }
 107
 108 bool CustomScrollArea::viewportEvent(QEvent *event)
 109 {
 110         switch (event->type()) {
 111         case QEvent::Paint:
 112         case QEvent::MouseButtonPress:
 113         case QEvent::MouseButtonRelease:
 114         case QEvent::MouseButtonDblClick:
 115         case QEvent::MouseMove:
 116         case QEvent::Wheel:
 117         case QEvent::TouchBegin:
 118         case QEvent::TouchUpdate:
 119         case QEvent::TouchEnd:
 120                 return false;
 121         default:
 122                 return QAbstractScrollArea::viewportEvent(event);
 123         }
 124 }
 125
 126 View::View(Session &session, bool is_main_view, QWidget *parent) :
 127         ViewBase(session, is_main_view, parent),
 128         splitter_(new QSplitter()),
 129         scale_(1e-3),
 130         offset_(0),
 131         updating_scroll_(false),
 132         settings_restored_(false),
 133         sticky_scrolling_(false), // Default setting is set in MainWindow::setup_ui()
 134         always_zoom_to_fit_(false),
 135         tick_period_(0),
 136         tick_prefix_(pv::util::SIPrefix::yocto),
 137         tick_precision_(0),
 138         time_unit_(util::TimeUnit::Time),
 139         show_cursors_(false),
 140         cursors_(new CursorPair(*this)),
 141         next_flag_text_('A'),
 142         trigger_markers_(),
 143         hover_point_(-1, -1),
 144         scroll_needs_defaults_(true),
 145         saved_v_offset_(0)
 146 {
 147         QVBoxLayout *root_layout = new QVBoxLayout(this);
 148         root_layout->setContentsMargins(0, 0, 0, 0);
 149         root_layout->addWidget(splitter_);
 150
 151         viewport_ = new Viewport(*this);
 152         scrollarea_ = new CustomScrollArea(splitter_);
 153         scrollarea_->setViewport(viewport_);
 154         scrollarea_->setFrameShape(QFrame::NoFrame);
 155
 156         ruler_ = new Ruler(*this);
 157
 158         header_ = new Header(*this);
 159         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 160
 161         // We put the header into a simple layout so that we can add the top margin,
 162         // allowing us to make it line up with the bottom of the ruler
 163         QWidget *header_container = new QWidget();
 164         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 165         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 166         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 167         header_layout->addWidget(header_);
 168
 169         // To let the ruler and scrollarea be on the same split pane, we need a layout
 170         QWidget *trace_container = new QWidget();
 171         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 172         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 173         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 174         trace_layout->setContentsMargins(0, 0, 0, 0);
 175         trace_layout->addWidget(ruler_);
 176         trace_layout->addWidget(scrollarea_);
 177
 178         splitter_->addWidget(header_container);
 179         splitter_->addWidget(trace_container);
 180         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 181         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 182         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 183         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 184         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 185         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 186
 187         viewport_->installEventFilter(this);
 188         ruler_->installEventFilter(this);
 189         header_->installEventFilter(this);
 190
 191         // Set up settings and event handlers
 192         GlobalSettings settings;
 193         coloured_bg_ = settings.value(GlobalSettings::Key_View_ColouredBG).toBool();
 194
 195         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 196                 this, SLOT(h_scroll_value_changed(int)));
 197         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 198                 this, SLOT(v_scroll_value_changed()));
 199
 200         connect(header_, SIGNAL(selection_changed()),
 201                 ruler_, SLOT(clear_selection()));
 202         connect(ruler_, SIGNAL(selection_changed()),
 203                 header_, SLOT(clear_selection()));
 204
 205         connect(header_, SIGNAL(selection_changed()),
 206                 this, SIGNAL(selection_changed()));
 207         connect(ruler_, SIGNAL(selection_changed()),
 208                 this, SIGNAL(selection_changed()));
 209
 210         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 211                 this, SLOT(on_splitter_moved()));
 212
 213         connect(this, SIGNAL(hover_point_changed()),
 214                 this, SLOT(on_hover_point_changed()));
 215
 216         connect(&lazy_event_handler_, SIGNAL(timeout()),
 217                 this, SLOT(process_sticky_events()));
 218         lazy_event_handler_.setSingleShot(true);
 219
 220         // Trigger the initial event manually. The default device has signals
 221         // which were created before this object came into being
 222         signals_changed();
 223
 224         // make sure the transparent widgets are on the top
 225         ruler_->raise();
 226         header_->raise();
 227
 228         // Update the zoom state
 229         calculate_tick_spacing();
 230 }
 231
 232 Session& View::session()
 233 {
 234         return session_;
 235 }
 236
 237 const Session& View::session() const
 238 {
 239         return session_;
 240 }
 241
 242 unordered_set< shared_ptr<Signal> > View::signals() const
 243 {
 244         return signals_;
 245 }
 246
 247 void View::clear_signals()
 248 {
 249         ViewBase::clear_signalbases();
 250         signals_.clear();
 251 }
 252
 253 void View::add_signal(const shared_ptr<Signal> signal)
 254 {
 255         ViewBase::add_signalbase(signal->base());
 256         signals_.insert(signal);
 257 }
 258
 259 #ifdef ENABLE_DECODE
 260 void View::clear_decode_signals()
 261 {
 262         decode_traces_.clear();
 263 }
 264
 265 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 266 {
 267         shared_ptr<DecodeTrace> d(
 268                 new DecodeTrace(session_, signal, decode_traces_.size()));
 269         decode_traces_.push_back(d);
 270 }
 271
 272 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 273 {
 274         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 275                 if ((*i)->base() == signal) {
 276                         decode_traces_.erase(i);
 277                         signals_changed();
 278                         return;
 279                 }
 280 }
 281 #endif
 282
 283 View* View::view()
 284 {
 285         return this;
 286 }
 287
 288 const View* View::view() const
 289 {
 290         return this;
 291 }
 292
 293 Viewport* View::viewport()
 294 {
 295         return viewport_;
 296 }
 297
 298 const Viewport* View::viewport() const
 299 {
 300         return viewport_;
 301 }
 302
 303 void View::save_settings(QSettings &settings) const
 304 {
 305         settings.setValue("scale", scale_);
 306         settings.setValue("v_offset",
 307                 scrollarea_->verticalScrollBar()->sliderPosition());
 308
 309         settings.setValue("splitter_state", splitter_->saveState());
 310
 311         stringstream ss;
 312         boost::archive::text_oarchive oa(ss);
 313         oa << boost::serialization::make_nvp("offset", offset_);
 314         settings.setValue("offset", QString::fromStdString(ss.str()));
 315
 316         for (shared_ptr<Signal> signal : signals_) {
 317                 settings.beginGroup(signal->base()->internal_name());
 318                 signal->save_settings(settings);
 319                 settings.endGroup();
 320         }
 321 }
 322
 323 void View::restore_settings(QSettings &settings)
 324 {
 325         // Note: It is assumed that this function is only called once,
 326         // immediately after restoring a previous session.
 327
 328         if (settings.contains("scale"))
 329                 set_scale(settings.value("scale").toDouble());
 330
 331         if (settings.contains("offset")) {
 332                 util::Timestamp offset;
 333                 stringstream ss;
 334                 ss << settings.value("offset").toString().toStdString();
 335
 336                 boost::archive::text_iarchive ia(ss);
 337                 ia >> boost::serialization::make_nvp("offset", offset);
 338
 339                 set_offset(offset);
 340         }
 341
 342         if (settings.contains("splitter_state"))
 343                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 344
 345         for (shared_ptr<Signal> signal : signals_) {
 346                 settings.beginGroup(signal->base()->internal_name());
 347                 signal->restore_settings(settings);
 348                 settings.endGroup();
 349         }
 350
 351         if (settings.contains("v_offset")) {
 352                 saved_v_offset_ = settings.value("v_offset").toInt();
 353                 set_v_offset(saved_v_offset_);
 354                 scroll_needs_defaults_ = false;
 355                 // Note: see eventFilter() for additional information
 356         }
 357
 358         settings_restored_ = true;
 359 }
 360
 361 vector< shared_ptr<TimeItem> > View::time_items() const
 362 {
 363         const vector<shared_ptr<Flag>> f(flags());
 364         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 365         items.push_back(cursors_);
 366         items.push_back(cursors_->first());
 367         items.push_back(cursors_->second());
 368
 369         for (auto trigger_marker : trigger_markers_)
 370                 items.push_back(trigger_marker);
 371
 372         return items;
 373 }
 374
 375 double View::scale() const
 376 {
 377         return scale_;
 378 }
 379
 380 void View::set_scale(double scale)
 381 {
 382         if (scale_ != scale) {
 383                 scale_ = scale;
 384                 scale_changed();
 385         }
 386 }
 387
 388 const Timestamp& View::offset() const
 389 {
 390         return offset_;
 391 }
 392
 393 void View::set_offset(const pv::util::Timestamp& offset)
 394 {
 395         if (offset_ != offset) {
 396                 offset_ = offset;
 397                 offset_changed();
 398         }
 399 }
 400
 401 int View::owner_visual_v_offset() const
 402 {
 403         return -scrollarea_->verticalScrollBar()->sliderPosition();
 404 }
 405
 406 void View::set_v_offset(int offset)
 407 {
 408         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 409         header_->update();
 410         viewport_->update();
 411 }
 412
 413 unsigned int View::depth() const
 414 {
 415         return 0;
 416 }
 417
 418 pv::util::SIPrefix View::tick_prefix() const
 419 {
 420         return tick_prefix_;
 421 }
 422
 423 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 424 {
 425         if (tick_prefix_ != tick_prefix) {
 426                 tick_prefix_ = tick_prefix;
 427                 tick_prefix_changed();
 428         }
 429 }
 430
 431 unsigned int View::tick_precision() const
 432 {
 433         return tick_precision_;
 434 }
 435
 436 void View::set_tick_precision(unsigned tick_precision)
 437 {
 438         if (tick_precision_ != tick_precision) {
 439                 tick_precision_ = tick_precision;
 440                 tick_precision_changed();
 441         }
 442 }
 443
 444 const pv::util::Timestamp& View::tick_period() const
 445 {
 446         return tick_period_;
 447 }
 448
 449 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 450 {
 451         if (tick_period_ != tick_period) {
 452                 tick_period_ = tick_period;
 453                 tick_period_changed();
 454         }
 455 }
 456
 457 TimeUnit View::time_unit() const
 458 {
 459         return time_unit_;
 460 }
 461
 462 void View::set_time_unit(pv::util::TimeUnit time_unit)
 463 {
 464         if (time_unit_ != time_unit) {
 465                 time_unit_ = time_unit;
 466                 time_unit_changed();
 467         }
 468 }
 469
 470 void View::zoom(double steps)
 471 {
 472         zoom(steps, viewport_->width() / 2);
 473 }
 474
 475 void View::zoom(double steps, int offset)
 476 {
 477         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 478 }
 479
 480 void View::zoom_fit(bool gui_state)
 481 {
 482         // Act as one-shot when stopped, toggle along with the GUI otherwise
 483         if (session_.get_capture_state() == Session::Stopped) {
 484                 always_zoom_to_fit_ = false;
 485                 always_zoom_to_fit_changed(false);
 486         } else {
 487                 always_zoom_to_fit_ = gui_state;
 488                 always_zoom_to_fit_changed(gui_state);
 489         }
 490
 491         const pair<Timestamp, Timestamp> extents = get_time_extents();
 492         const Timestamp delta = extents.second - extents.first;
 493         if (delta < Timestamp("1e-12"))
 494                 return;
 495
 496         assert(viewport_);
 497         const int w = viewport_->width();
 498         if (w <= 0)
 499                 return;
 500
 501         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 502         set_scale_offset(scale.convert_to<double>(), extents.first);
 503 }
 504
 505 void View::zoom_one_to_one()
 506 {
 507         using pv::data::SignalData;
 508
 509         // Make a set of all the visible data objects
 510         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 511         if (visible_data.empty())
 512                 return;
 513
 514         assert(viewport_);
 515         const int w = viewport_->width();
 516         if (w <= 0)
 517                 return;
 518
 519         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 520 }
 521
 522 void View::set_scale_offset(double scale, const Timestamp& offset)
 523 {
 524         // Disable sticky scrolling / always zoom to fit when acquisition runs
 525         // and user drags the viewport
 526         if ((scale_ == scale) && (offset_ != offset) &&
 527                         (session_.get_capture_state() == Session::Running)) {
 528
 529                 if (sticky_scrolling_) {
 530                         sticky_scrolling_ = false;
 531                         sticky_scrolling_changed(false);
 532                 }
 533
 534                 if (always_zoom_to_fit_) {
 535                         always_zoom_to_fit_ = false;
 536                         always_zoom_to_fit_changed(false);
 537                 }
 538         }
 539
 540         set_scale(scale);
 541         set_offset(offset);
 542
 543         calculate_tick_spacing();
 544
 545         update_scroll();
 546         ruler_->update();
 547         viewport_->update();
 548 }
 549
 550 set< shared_ptr<SignalData> > View::get_visible_data() const
 551 {
 552         // Make a set of all the visible data objects
 553         set< shared_ptr<SignalData> > visible_data;
 554         for (const shared_ptr<Signal> sig : signals_)
 555                 if (sig->enabled())
 556                         visible_data.insert(sig->data());
 557
 558         return visible_data;
 559 }
 560
 561 pair<Timestamp, Timestamp> View::get_time_extents() const
 562 {
 563         boost::optional<Timestamp> left_time, right_time;
 564         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 565         for (const shared_ptr<SignalData> d : visible_data) {
 566                 const vector< shared_ptr<Segment> > segments = d->segments();
 567                 for (const shared_ptr<Segment> &s : segments) {
 568                         double samplerate = s->samplerate();
 569                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 570
 571                         const Timestamp start_time = s->start_time();
 572                         left_time = left_time ?
 573                                 min(*left_time, start_time) :
 574                                                 start_time;
 575                         right_time = right_time ?
 576                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 577                                                  start_time + d->max_sample_count() / samplerate;
 578                 }
 579         }
 580
 581         if (!left_time || !right_time)
 582                 return make_pair(0, 0);
 583
 584         assert(*left_time < *right_time);
 585         return make_pair(*left_time, *right_time);
 586 }
 587
 588 void View::enable_show_sampling_points(bool state)
 589 {
 590         (void)state;
 591
 592         viewport_->update();
 593 }
 594
 595 void View::enable_show_analog_minor_grid(bool state)
 596 {
 597         (void)state;
 598
 599         viewport_->update();
 600 }
 601
 602 void View::enable_coloured_bg(bool state)
 603 {
 604         coloured_bg_ = state;
 605         viewport_->update();
 606 }
 607
 608 bool View::coloured_bg() const
 609 {
 610         return coloured_bg_;
 611 }
 612
 613 bool View::cursors_shown() const
 614 {
 615         return show_cursors_;
 616 }
 617
 618 void View::show_cursors(bool show)
 619 {
 620         show_cursors_ = show;
 621         ruler_->update();
 622         viewport_->update();
 623 }
 624
 625 void View::centre_cursors()
 626 {
 627         const double time_width = scale_ * viewport_->width();
 628         cursors_->first()->set_time(offset_ + time_width * 0.4);
 629         cursors_->second()->set_time(offset_ + time_width * 0.6);
 630         ruler_->update();
 631         viewport_->update();
 632 }
 633
 634 shared_ptr<CursorPair> View::cursors() const
 635 {
 636         return cursors_;
 637 }
 638
 639 void View::add_flag(const Timestamp& time)
 640 {
 641         flags_.push_back(make_shared<Flag>(*this, time,
 642                 QString("%1").arg(next_flag_text_)));
 643
 644         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 645                 (next_flag_text_ + 1);
 646
 647         time_item_appearance_changed(true, true);
 648 }
 649
 650 void View::remove_flag(shared_ptr<Flag> flag)
 651 {
 652         flags_.remove(flag);
 653         time_item_appearance_changed(true, true);
 654 }
 655
 656 vector< shared_ptr<Flag> > View::flags() const
 657 {
 658         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 659         stable_sort(flags.begin(), flags.end(),
 660                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 661                         return a->time() < b->time();
 662                 });
 663
 664         return flags;
 665 }
 666
 667 const QPoint& View::hover_point() const
 668 {
 669         return hover_point_;
 670 }
 671
 672 void View::restack_all_trace_tree_items()
 673 {
 674         // Make a list of owners that is sorted from deepest first
 675         const vector<shared_ptr<TraceTreeItem>> items(
 676                 list_by_type<TraceTreeItem>());
 677         set< TraceTreeItemOwner* > owners;
 678         for (const auto &r : items)
 679                 owners.insert(r->owner());
 680         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 681         sort(sorted_owners.begin(), sorted_owners.end(),
 682                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 683                         return a->depth() > b->depth(); });
 684
 685         // Restack the items recursively
 686         for (auto &o : sorted_owners)
 687                 o->restack_items();
 688
 689         // Animate the items to their destination
 690         for (const auto &i : items)
 691                 i->animate_to_layout_v_offset();
 692 }
 693
 694 void View::trigger_event(util::Timestamp location)
 695 {
 696         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 697 }
 698
 699 void View::get_scroll_layout(double &length, Timestamp &offset) const
 700 {
 701         const pair<Timestamp, Timestamp> extents = get_time_extents();
 702         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 703         offset = offset_ / scale_;
 704 }
 705
 706 void View::set_zoom(double scale, int offset)
 707 {
 708         // Reset the "always zoom to fit" feature as the user changed the zoom
 709         always_zoom_to_fit_ = false;
 710         always_zoom_to_fit_changed(false);
 711
 712         const Timestamp cursor_offset = offset_ + scale_ * offset;
 713         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 714         const Timestamp new_offset = cursor_offset - new_scale * offset;
 715         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 716 }
 717
 718 void View::calculate_tick_spacing()
 719 {
 720         const double SpacingIncrement = 10.0f;
 721         const double MinValueSpacing = 40.0f;
 722
 723         // Figure out the highest numeric value visible on a label
 724         const QSize areaSize = viewport_->size();
 725         const Timestamp max_time = max(fabs(offset_),
 726                 fabs(offset_ + scale_ * areaSize.width()));
 727
 728         double min_width = SpacingIncrement;
 729         double label_width, tick_period_width;
 730
 731         QFontMetrics m(QApplication::font());
 732
 733         // Copies of the member variables with the same name, used in the calculation
 734         // and written back afterwards, so that we don't emit signals all the time
 735         // during the calculation.
 736         pv::util::Timestamp tick_period = tick_period_;
 737         pv::util::SIPrefix tick_prefix = tick_prefix_;
 738         unsigned tick_precision = tick_precision_;
 739
 740         do {
 741                 const double min_period = scale_ * min_width;
 742
 743                 const int order = (int)floorf(log10f(min_period));
 744                 const pv::util::Timestamp order_decimal =
 745                         pow(pv::util::Timestamp(10), order);
 746
 747                 // Allow for a margin of error so that a scale unit of 1 can be used.
 748                 // Otherwise, for a SU of 1 the tick period will almost always be below
 749                 // the min_period by a small amount - and thus skipped in favor of 2.
 750                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 751                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 752                 double tp_with_margin;
 753                 unsigned int unit = 0;
 754
 755                 do {
 756                         tp_with_margin = order_decimal.convert_to<double>() *
 757                                 (ScaleUnits[unit++] + tp_margin);
 758                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 759
 760                 tick_period = order_decimal * ScaleUnits[unit - 1];
 761                 tick_prefix = static_cast<pv::util::SIPrefix>(
 762                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 763
 764                 // Precision is the number of fractional digits required, not
 765                 // taking the prefix into account (and it must never be negative)
 766                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 767
 768                 tick_period_width = (tick_period / scale_).convert_to<double>();
 769
 770                 const QString label_text = Ruler::format_time_with_distance(
 771                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 772
 773                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 774                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 775                                 MinValueSpacing;
 776
 777                 min_width += SpacingIncrement;
 778         } while (tick_period_width < label_width);
 779
 780         set_tick_period(tick_period);
 781         set_tick_prefix(tick_prefix);
 782         set_tick_precision(tick_precision);
 783 }
 784
 785 void View::adjust_top_margin()
 786 {
 787         assert(viewport_);
 788
 789         const QSize areaSize = viewport_->size();
 790
 791         const pair<int, int> extents = v_extents();
 792         const int top_margin = owner_visual_v_offset() + extents.first;
 793         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
 794
 795         // Do we have empty space at the top while the last trace goes out of screen?
 796         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
 797                 const int trace_height = extents.second - extents.first;
 798
 799                 // Center everything vertically if there is enough space
 800                 if (areaSize.height() >= trace_height)
 801                         set_v_offset(extents.first -
 802                                 ((areaSize.height() - trace_height) / 2));
 803                 else
 804                         // Remove the top margin to make as many traces fit on screen as possible
 805                         set_v_offset(extents.first);
 806         }
 807 }
 808
 809 void View::update_scroll()
 810 {
 811         assert(viewport_);
 812         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
 813         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
 814
 815         const QSize areaSize = viewport_->size();
 816
 817         // Set the horizontal scroll bar
 818         double length = 0;
 819         Timestamp offset;
 820         get_scroll_layout(length, offset);
 821         length = max(length - areaSize.width(), 0.0);
 822
 823         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
 824
 825         hscrollbar->setPageStep(areaSize.width() / 2);
 826         hscrollbar->setSingleStep(major_tick_distance);
 827
 828         updating_scroll_ = true;
 829
 830         if (length < MaxScrollValue) {
 831                 hscrollbar->setRange(0, length);
 832                 hscrollbar->setSliderPosition(offset.convert_to<double>());
 833         } else {
 834                 hscrollbar->setRange(0, MaxScrollValue);
 835                 hscrollbar->setSliderPosition(
 836                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
 837         }
 838
 839         updating_scroll_ = false;
 840
 841         // Set the vertical scrollbar
 842         vscrollbar->setPageStep(areaSize.height());
 843         vscrollbar->setSingleStep(areaSize.height() / 8);
 844
 845         const pair<int, int> extents = v_extents();
 846
 847         // Don't change the scrollbar range if there are no traces
 848         if (extents.first != extents.second)
 849                 vscrollbar->setRange(extents.first - areaSize.height(),
 850                         extents.second);
 851
 852         if (scroll_needs_defaults_)
 853                 set_scroll_default();
 854 }
 855
 856 void View::reset_scroll()
 857 {
 858         scrollarea_->verticalScrollBar()->setRange(0, 0);
 859 }
 860
 861 void View::set_scroll_default()
 862 {
 863         assert(viewport_);
 864
 865         const QSize areaSize = viewport_->size();
 866
 867         const pair<int, int> extents = v_extents();
 868         const int trace_height = extents.second - extents.first;
 869
 870         // Do all traces fit in the view?
 871         if (areaSize.height() >= trace_height)
 872                 // Center all traces vertically
 873                 set_v_offset(extents.first -
 874                         ((areaSize.height() - trace_height) / 2));
 875         else
 876                 // Put the first trace at the top, letting the bottom ones overflow
 877                 set_v_offset(extents.first);
 878 }
 879
 880 bool View::header_was_shrunk() const
 881 {
 882         const int header_pane_width = splitter_->sizes().front();
 883         const int header_width = header_->extended_size_hint().width();
 884
 885         // Allow for a slight margin of error so that we also accept
 886         // slight differences when e.g. a label name change increased
 887         // the overall width
 888         return (header_pane_width < (header_width - 10));
 889 }
 890
 891 void View::expand_header_to_fit()
 892 {
 893         int splitter_area_width = 0;
 894         for (int w : splitter_->sizes())
 895                 splitter_area_width += w;
 896
 897         // Make sure the header has enough horizontal space to show all labels fully
 898         QList<int> pane_sizes;
 899         pane_sizes.push_back(header_->extended_size_hint().width());
 900         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
 901         splitter_->setSizes(pane_sizes);
 902 }
 903
 904 void View::update_layout()
 905 {
 906         update_scroll();
 907 }
 908
 909 TraceTreeItemOwner* View::find_prevalent_trace_group(
 910         const shared_ptr<sigrok::ChannelGroup> &group,
 911         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
 912                 &signal_map)
 913 {
 914         assert(group);
 915
 916         unordered_set<TraceTreeItemOwner*> owners;
 917         vector<TraceTreeItemOwner*> owner_list;
 918
 919         // Make a set and a list of all the owners
 920         for (const auto &channel : group->channels()) {
 921                 for (auto entry : signal_map) {
 922                         if (entry.first->channel() == channel) {
 923                                 TraceTreeItemOwner *const o = (entry.second)->owner();
 924                                 owner_list.push_back(o);
 925                                 owners.insert(o);
 926                         }
 927                 }
 928         }
 929
 930         // Iterate through the list of owners, and find the most prevalent
 931         size_t max_prevalence = 0;
 932         TraceTreeItemOwner *prevalent_owner = nullptr;
 933         for (TraceTreeItemOwner *owner : owners) {
 934                 const size_t prevalence = count_if(
 935                         owner_list.begin(), owner_list.end(),
 936                         [&](TraceTreeItemOwner *o) { return o == owner; });
 937                 if (prevalence > max_prevalence) {
 938                         max_prevalence = prevalence;
 939                         prevalent_owner = owner;
 940                 }
 941         }
 942
 943         return prevalent_owner;
 944 }
 945
 946 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
 947         const vector< shared_ptr<sigrok::Channel> > &channels,
 948         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
 949                 &signal_map,
 950         set< shared_ptr<Trace> > &add_list)
 951 {
 952         vector< shared_ptr<Trace> > filtered_traces;
 953
 954         for (const auto &channel : channels) {
 955                 for (auto entry : signal_map) {
 956                         if (entry.first->channel() == channel) {
 957                                 shared_ptr<Trace> trace = entry.second;
 958                                 const auto list_iter = add_list.find(trace);
 959                                 if (list_iter == add_list.end())
 960                                         continue;
 961
 962                                 filtered_traces.push_back(trace);
 963                                 add_list.erase(list_iter);
 964                         }
 965                 }
 966         }
 967
 968         return filtered_traces;
 969 }
 970
 971 void View::determine_time_unit()
 972 {
 973         // Check whether we know the sample rate and hence can use time as the unit
 974         if (time_unit_ == util::TimeUnit::Samples) {
 975                 // Check all signals but...
 976                 for (const shared_ptr<Signal> signal : signals_) {
 977                         const shared_ptr<SignalData> data = signal->data();
 978
 979                         // ...only check first segment of each
 980                         const vector< shared_ptr<Segment> > segments = data->segments();
 981                         if (!segments.empty())
 982                                 if (segments[0]->samplerate()) {
 983                                         set_time_unit(util::TimeUnit::Time);
 984                                         break;
 985                                 }
 986                 }
 987         }
 988 }
 989
 990 bool View::eventFilter(QObject *object, QEvent *event)
 991 {
 992         const QEvent::Type type = event->type();
 993         if (type == QEvent::MouseMove) {
 994
 995                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
 996                 if (object == viewport_)
 997                         hover_point_ = mouse_event->pos();
 998                 else if (object == ruler_)
 999                         hover_point_ = QPoint(mouse_event->x(), 0);
1000                 else if (object == header_)
1001                         hover_point_ = QPoint(0, mouse_event->y());
1002                 else
1003                         hover_point_ = QPoint(-1, -1);
1004
1005                 hover_point_changed();
1006
1007         } else if (type == QEvent::Leave) {
1008                 hover_point_ = QPoint(-1, -1);
1009                 hover_point_changed();
1010         } else if (type == QEvent::Show) {
1011
1012                 // This is somewhat of a hack, unfortunately. We cannot use
1013                 // set_v_offset() from within restore_settings() as the view
1014                 // at that point is neither visible nor properly sized.
1015                 // This is the least intrusive workaround I could come up
1016                 // with: set the vertical offset (or scroll defaults) when
1017                 // the view is shown, which happens after all widgets were
1018                 // resized to their final sizes.
1019                 update_layout();
1020
1021                 if (!settings_restored_)
1022                         expand_header_to_fit();
1023
1024                 if (scroll_needs_defaults_) {
1025                         set_scroll_default();
1026                         scroll_needs_defaults_ = false;
1027                 }
1028
1029                 if (saved_v_offset_) {
1030                         set_v_offset(saved_v_offset_);
1031                         saved_v_offset_ = 0;
1032                 }
1033         }
1034
1035         return QObject::eventFilter(object, event);
1036 }
1037
1038 void View::resizeEvent(QResizeEvent* event)
1039 {
1040         // Only adjust the top margin if we shrunk vertically
1041         if (event->size().height() < event->oldSize().height())
1042                 adjust_top_margin();
1043
1044         update_layout();
1045 }
1046
1047 void View::row_item_appearance_changed(bool label, bool content)
1048 {
1049         if (label)
1050                 header_->update();
1051         if (content)
1052                 viewport_->update();
1053 }
1054
1055 void View::time_item_appearance_changed(bool label, bool content)
1056 {
1057         if (label) {
1058                 ruler_->update();
1059
1060                 // Make sure the header pane width is updated, too
1061                 update_layout();
1062         }
1063
1064         if (content)
1065                 viewport_->update();
1066 }
1067
1068 void View::extents_changed(bool horz, bool vert)
1069 {
1070         sticky_events_ |=
1071                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1072                 (vert ? TraceTreeItemVExtentsChanged : 0);
1073
1074         lazy_event_handler_.start();
1075 }
1076
1077 void View::on_splitter_moved()
1078 {
1079         // Setting the maximum width of the header widget doesn't work as
1080         // expected because the splitter would allow the user to make the
1081         // pane wider than that, creating empty space as a result.
1082         // To make this work, we stricly enforce the maximum width by
1083         // expanding the header unless the user shrunk it on purpose.
1084         // As we're then setting the width of the header pane, we set the
1085         // splitter to the maximum allowed position.
1086         if (!header_was_shrunk())
1087                 expand_header_to_fit();
1088 }
1089
1090 void View::h_scroll_value_changed(int value)
1091 {
1092         if (updating_scroll_)
1093                 return;
1094
1095         // Disable sticky scrolling when user moves the horizontal scroll bar
1096         // during a running acquisition
1097         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1098                 sticky_scrolling_ = false;
1099                 sticky_scrolling_changed(false);
1100         }
1101
1102         const int range = scrollarea_->horizontalScrollBar()->maximum();
1103         if (range < MaxScrollValue)
1104                 set_offset(scale_ * value);
1105         else {
1106                 double length = 0;
1107                 Timestamp offset;
1108                 get_scroll_layout(length, offset);
1109                 set_offset(scale_ * length * value / MaxScrollValue);
1110         }
1111
1112         ruler_->update();
1113         viewport_->update();
1114 }
1115
1116 void View::v_scroll_value_changed()
1117 {
1118         header_->update();
1119         viewport_->update();
1120 }
1121
1122 void View::signals_changed()
1123 {
1124         using sigrok::Channel;
1125
1126         vector< shared_ptr<Channel> > channels;
1127         shared_ptr<sigrok::Device> sr_dev;
1128
1129         // Do we need to set the vertical scrollbar to its default position later?
1130         // We do if there are no traces, i.e. the scroll bar has no range set
1131         bool reset_scrollbar =
1132                 (scrollarea_->verticalScrollBar()->minimum() ==
1133                         scrollarea_->verticalScrollBar()->maximum());
1134
1135         if (!session_.device()) {
1136                 reset_scroll();
1137                 signals_.clear();
1138         } else {
1139                 sr_dev = session_.device()->device();
1140                 assert(sr_dev);
1141                 channels = sr_dev->channels();
1142         }
1143
1144         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1145
1146         // Make a list of traces that are being added, and a list of traces
1147         // that are being removed
1148         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1149         const set<shared_ptr<Trace>> prev_traces(
1150                 prev_trace_list.begin(), prev_trace_list.end());
1151
1152         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1153
1154 #ifdef ENABLE_DECODE
1155         traces.insert(decode_traces_.begin(), decode_traces_.end());
1156 #endif
1157
1158         set< shared_ptr<Trace> > add_traces;
1159         set_difference(traces.begin(), traces.end(),
1160                 prev_traces.begin(), prev_traces.end(),
1161                 inserter(add_traces, add_traces.begin()));
1162
1163         set< shared_ptr<Trace> > remove_traces;
1164         set_difference(prev_traces.begin(), prev_traces.end(),
1165                 traces.begin(), traces.end(),
1166                 inserter(remove_traces, remove_traces.begin()));
1167
1168         // Make a look-up table of sigrok Channels to pulseview Signals
1169         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1170                 signal_map;
1171         for (const shared_ptr<Signal> &sig : signals_)
1172                 signal_map[sig->base()] = sig;
1173
1174         // Populate channel groups
1175         if (sr_dev)
1176                 for (auto entry : sr_dev->channel_groups()) {
1177                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1178
1179                         if (group->channels().size() <= 1)
1180                                 continue;
1181
1182                         // Find best trace group to add to
1183                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1184                                 group, signal_map);
1185
1186                         // If there is no trace group, create one
1187                         shared_ptr<TraceGroup> new_trace_group;
1188                         if (!owner) {
1189                                 new_trace_group.reset(new TraceGroup());
1190                                 owner = new_trace_group.get();
1191                         }
1192
1193                         // Extract traces for the trace group, removing them from
1194                         // the add list
1195                         const vector< shared_ptr<Trace> > new_traces_in_group =
1196                                 extract_new_traces_for_channels(group->channels(),
1197                                         signal_map, add_traces);
1198
1199                         // Add the traces to the group
1200                         const pair<int, int> prev_v_extents = owner->v_extents();
1201                         int offset = prev_v_extents.second - prev_v_extents.first;
1202                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1203                                 assert(trace);
1204                                 owner->add_child_item(trace);
1205
1206                                 const pair<int, int> extents = trace->v_extents();
1207                                 if (trace->enabled())
1208                                         offset += -extents.first;
1209                                 trace->force_to_v_offset(offset);
1210                                 if (trace->enabled())
1211                                         offset += extents.second;
1212                         }
1213
1214                         if (new_trace_group) {
1215                                 // Assign proper vertical offsets to each channel in the group
1216                                 new_trace_group->restack_items();
1217
1218                                 // If this is a new group, enqueue it in the new top level
1219                                 // items list
1220                                 if (!new_traces_in_group.empty())
1221                                         new_top_level_items.push_back(new_trace_group);
1222                         }
1223                 }
1224
1225         // Enqueue the remaining logic channels in a group
1226         vector< shared_ptr<Channel> > logic_channels;
1227         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1228                 [](const shared_ptr<Channel>& c) {
1229                         return c->type() == sigrok::ChannelType::LOGIC; });
1230
1231         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1232                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1233
1234         if (non_grouped_logic_signals.size() > 0) {
1235                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1236                         make_shared<TraceGroup>());
1237                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1238                         non_grouped_trace_group->add_child_item(trace);
1239
1240                 non_grouped_trace_group->restack_items();
1241                 new_top_level_items.push_back(non_grouped_trace_group);
1242         }
1243
1244         // Enqueue the remaining channels as free ungrouped traces
1245         const vector< shared_ptr<Trace> > new_top_level_signals =
1246                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1247         new_top_level_items.insert(new_top_level_items.end(),
1248                 new_top_level_signals.begin(), new_top_level_signals.end());
1249
1250         // Enqueue any remaining traces i.e. decode traces
1251         new_top_level_items.insert(new_top_level_items.end(),
1252                 add_traces.begin(), add_traces.end());
1253
1254         // Remove any removed traces
1255         for (shared_ptr<Trace> trace : remove_traces) {
1256                 TraceTreeItemOwner *const owner = trace->owner();
1257                 assert(owner);
1258                 owner->remove_child_item(trace);
1259         }
1260
1261         // Remove any empty trace groups
1262         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1263                 if (group->child_items().size() == 0) {
1264                         remove_child_item(group);
1265                         group.reset();
1266                 }
1267
1268         // Add and position the pending top levels items
1269         int offset = v_extents().second;
1270         for (auto item : new_top_level_items) {
1271                 add_child_item(item);
1272
1273                 // Position the item after the last item or at the top if there is none
1274                 const pair<int, int> extents = item->v_extents();
1275
1276                 if (item->enabled())
1277                         offset += -extents.first;
1278
1279                 item->force_to_v_offset(offset);
1280
1281                 if (item->enabled())
1282                         offset += extents.second;
1283         }
1284
1285
1286         if (!new_top_level_items.empty())
1287                 // Expand the header pane because the header should become fully
1288                 // visible when new signals are added
1289                 expand_header_to_fit();
1290
1291         update_layout();
1292
1293         header_->update();
1294         viewport_->update();
1295
1296         if (reset_scrollbar)
1297                 set_scroll_default();
1298 }
1299
1300 void View::capture_state_updated(int state)
1301 {
1302         if (state == Session::Running) {
1303                 set_time_unit(util::TimeUnit::Samples);
1304
1305                 trigger_markers_.clear();
1306
1307                 // Activate "always zoom to fit" if the setting is enabled and we're
1308                 // the main view of this session (other trace views may be used for
1309                 // zooming and we don't want to mess them up)
1310                 GlobalSettings settings;
1311                 bool state = settings.value(GlobalSettings::Key_View_AlwaysZoomToFit).toBool();
1312                 if (is_main_view_ && state) {
1313                         always_zoom_to_fit_ = true;
1314                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1315                 }
1316
1317                 // Enable sticky scrolling if the setting is enabled
1318                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1319         }
1320
1321         if (state == Session::Stopped) {
1322                 // After acquisition has stopped we need to re-calculate the ticks once
1323                 // as it's otherwise done when the user pans or zooms, which is too late
1324                 calculate_tick_spacing();
1325
1326                 // Reset "always zoom to fit", the acquisition has stopped
1327                 if (always_zoom_to_fit_) {
1328                         // Perform a final zoom-to-fit before disabling
1329                         zoom_fit(always_zoom_to_fit_);
1330                         always_zoom_to_fit_ = false;
1331                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1332                 }
1333         }
1334 }
1335
1336 void View::perform_delayed_view_update()
1337 {
1338         if (always_zoom_to_fit_) {
1339                 zoom_fit(true);
1340         } else if (sticky_scrolling_) {
1341                 // Make right side of the view sticky
1342                 double length = 0;
1343                 Timestamp offset;
1344                 get_scroll_layout(length, offset);
1345
1346                 const QSize areaSize = viewport_->size();
1347                 length = max(length - areaSize.width(), 0.0);
1348
1349                 set_offset(scale_ * length);
1350         }
1351
1352         determine_time_unit();
1353         update_scroll();
1354         ruler_->update();
1355         viewport_->update();
1356 }
1357
1358 void View::process_sticky_events()
1359 {
1360         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1361                 update_layout();
1362         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1363                 restack_all_trace_tree_items();
1364                 update_scroll();
1365         }
1366
1367         // Clear the sticky events
1368         sticky_events_ = 0;
1369 }
1370
1371 void View::on_hover_point_changed()
1372 {
1373         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1374                 list_by_type<TraceTreeItem>());
1375         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1376                 r->hover_point_changed();
1377 }
1378
1379 } // namespace trace
1380 } // namespace views
1381 } // namespace pv