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         scale_at_acq_start_(0),
 147         offset_at_acq_start_(0),
 148         suppress_zoom_to_fit_after_acq_(false)
 149 {
 150         QVBoxLayout *root_layout = new QVBoxLayout(this);
 151         root_layout->setContentsMargins(0, 0, 0, 0);
 152         root_layout->addWidget(splitter_);
 153
 154         viewport_ = new Viewport(*this);
 155         scrollarea_ = new CustomScrollArea(splitter_);
 156         scrollarea_->setViewport(viewport_);
 157         scrollarea_->setFrameShape(QFrame::NoFrame);
 158
 159         ruler_ = new Ruler(*this);
 160
 161         header_ = new Header(*this);
 162         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 163
 164         // We put the header into a simple layout so that we can add the top margin,
 165         // allowing us to make it line up with the bottom of the ruler
 166         QWidget *header_container = new QWidget();
 167         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 168         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 169         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 170         header_layout->addWidget(header_);
 171
 172         // To let the ruler and scrollarea be on the same split pane, we need a layout
 173         QWidget *trace_container = new QWidget();
 174         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 175         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 176         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 177         trace_layout->setContentsMargins(0, 0, 0, 0);
 178         trace_layout->addWidget(ruler_);
 179         trace_layout->addWidget(scrollarea_);
 180
 181         splitter_->addWidget(header_container);
 182         splitter_->addWidget(trace_container);
 183         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 184         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 185         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 186         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 187         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 188         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 189
 190         viewport_->installEventFilter(this);
 191         ruler_->installEventFilter(this);
 192         header_->installEventFilter(this);
 193
 194         // Set up settings and event handlers
 195         GlobalSettings settings;
 196         coloured_bg_ = settings.value(GlobalSettings::Key_View_ColouredBG).toBool();
 197
 198         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 199                 this, SLOT(h_scroll_value_changed(int)));
 200         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 201                 this, SLOT(v_scroll_value_changed()));
 202
 203         connect(header_, SIGNAL(selection_changed()),
 204                 ruler_, SLOT(clear_selection()));
 205         connect(ruler_, SIGNAL(selection_changed()),
 206                 header_, SLOT(clear_selection()));
 207
 208         connect(header_, SIGNAL(selection_changed()),
 209                 this, SIGNAL(selection_changed()));
 210         connect(ruler_, SIGNAL(selection_changed()),
 211                 this, SIGNAL(selection_changed()));
 212
 213         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 214                 this, SLOT(on_splitter_moved()));
 215
 216         connect(this, SIGNAL(hover_point_changed()),
 217                 this, SLOT(on_hover_point_changed()));
 218
 219         connect(&lazy_event_handler_, SIGNAL(timeout()),
 220                 this, SLOT(process_sticky_events()));
 221         lazy_event_handler_.setSingleShot(true);
 222
 223         // Trigger the initial event manually. The default device has signals
 224         // which were created before this object came into being
 225         signals_changed();
 226
 227         // make sure the transparent widgets are on the top
 228         ruler_->raise();
 229         header_->raise();
 230
 231         // Update the zoom state
 232         calculate_tick_spacing();
 233 }
 234
 235 Session& View::session()
 236 {
 237         return session_;
 238 }
 239
 240 const Session& View::session() const
 241 {
 242         return session_;
 243 }
 244
 245 unordered_set< shared_ptr<Signal> > View::signals() const
 246 {
 247         return signals_;
 248 }
 249
 250 void View::clear_signals()
 251 {
 252         ViewBase::clear_signalbases();
 253         signals_.clear();
 254 }
 255
 256 void View::add_signal(const shared_ptr<Signal> signal)
 257 {
 258         ViewBase::add_signalbase(signal->base());
 259         signals_.insert(signal);
 260 }
 261
 262 #ifdef ENABLE_DECODE
 263 void View::clear_decode_signals()
 264 {
 265         decode_traces_.clear();
 266 }
 267
 268 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 269 {
 270         shared_ptr<DecodeTrace> d(
 271                 new DecodeTrace(session_, signal, decode_traces_.size()));
 272         decode_traces_.push_back(d);
 273 }
 274
 275 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 276 {
 277         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 278                 if ((*i)->base() == signal) {
 279                         decode_traces_.erase(i);
 280                         signals_changed();
 281                         return;
 282                 }
 283 }
 284 #endif
 285
 286 View* View::view()
 287 {
 288         return this;
 289 }
 290
 291 const View* View::view() const
 292 {
 293         return this;
 294 }
 295
 296 Viewport* View::viewport()
 297 {
 298         return viewport_;
 299 }
 300
 301 const Viewport* View::viewport() const
 302 {
 303         return viewport_;
 304 }
 305
 306 void View::save_settings(QSettings &settings) const
 307 {
 308         settings.setValue("scale", scale_);
 309         settings.setValue("v_offset",
 310                 scrollarea_->verticalScrollBar()->sliderPosition());
 311
 312         settings.setValue("splitter_state", splitter_->saveState());
 313
 314         stringstream ss;
 315         boost::archive::text_oarchive oa(ss);
 316         oa << boost::serialization::make_nvp("offset", offset_);
 317         settings.setValue("offset", QString::fromStdString(ss.str()));
 318
 319         for (shared_ptr<Signal> signal : signals_) {
 320                 settings.beginGroup(signal->base()->internal_name());
 321                 signal->save_settings(settings);
 322                 settings.endGroup();
 323         }
 324 }
 325
 326 void View::restore_settings(QSettings &settings)
 327 {
 328         // Note: It is assumed that this function is only called once,
 329         // immediately after restoring a previous session.
 330
 331         if (settings.contains("scale"))
 332                 set_scale(settings.value("scale").toDouble());
 333
 334         if (settings.contains("offset")) {
 335                 util::Timestamp offset;
 336                 stringstream ss;
 337                 ss << settings.value("offset").toString().toStdString();
 338
 339                 boost::archive::text_iarchive ia(ss);
 340                 ia >> boost::serialization::make_nvp("offset", offset);
 341
 342                 set_offset(offset);
 343         }
 344
 345         if (settings.contains("splitter_state"))
 346                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 347
 348         for (shared_ptr<Signal> signal : signals_) {
 349                 settings.beginGroup(signal->base()->internal_name());
 350                 signal->restore_settings(settings);
 351                 settings.endGroup();
 352         }
 353
 354         if (settings.contains("v_offset")) {
 355                 saved_v_offset_ = settings.value("v_offset").toInt();
 356                 set_v_offset(saved_v_offset_);
 357                 scroll_needs_defaults_ = false;
 358                 // Note: see eventFilter() for additional information
 359         }
 360
 361         settings_restored_ = true;
 362         suppress_zoom_to_fit_after_acq_ = true;
 363 }
 364
 365 vector< shared_ptr<TimeItem> > View::time_items() const
 366 {
 367         const vector<shared_ptr<Flag>> f(flags());
 368         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 369         items.push_back(cursors_);
 370         items.push_back(cursors_->first());
 371         items.push_back(cursors_->second());
 372
 373         for (auto trigger_marker : trigger_markers_)
 374                 items.push_back(trigger_marker);
 375
 376         return items;
 377 }
 378
 379 double View::scale() const
 380 {
 381         return scale_;
 382 }
 383
 384 void View::set_scale(double scale)
 385 {
 386         if (scale_ != scale) {
 387                 scale_ = scale;
 388                 scale_changed();
 389         }
 390 }
 391
 392 const Timestamp& View::offset() const
 393 {
 394         return offset_;
 395 }
 396
 397 void View::set_offset(const pv::util::Timestamp& offset)
 398 {
 399         if (offset_ != offset) {
 400                 offset_ = offset;
 401                 offset_changed();
 402         }
 403 }
 404
 405 int View::owner_visual_v_offset() const
 406 {
 407         return -scrollarea_->verticalScrollBar()->sliderPosition();
 408 }
 409
 410 void View::set_v_offset(int offset)
 411 {
 412         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 413         header_->update();
 414         viewport_->update();
 415 }
 416
 417 unsigned int View::depth() const
 418 {
 419         return 0;
 420 }
 421
 422 pv::util::SIPrefix View::tick_prefix() const
 423 {
 424         return tick_prefix_;
 425 }
 426
 427 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 428 {
 429         if (tick_prefix_ != tick_prefix) {
 430                 tick_prefix_ = tick_prefix;
 431                 tick_prefix_changed();
 432         }
 433 }
 434
 435 unsigned int View::tick_precision() const
 436 {
 437         return tick_precision_;
 438 }
 439
 440 void View::set_tick_precision(unsigned tick_precision)
 441 {
 442         if (tick_precision_ != tick_precision) {
 443                 tick_precision_ = tick_precision;
 444                 tick_precision_changed();
 445         }
 446 }
 447
 448 const pv::util::Timestamp& View::tick_period() const
 449 {
 450         return tick_period_;
 451 }
 452
 453 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 454 {
 455         if (tick_period_ != tick_period) {
 456                 tick_period_ = tick_period;
 457                 tick_period_changed();
 458         }
 459 }
 460
 461 TimeUnit View::time_unit() const
 462 {
 463         return time_unit_;
 464 }
 465
 466 void View::set_time_unit(pv::util::TimeUnit time_unit)
 467 {
 468         if (time_unit_ != time_unit) {
 469                 time_unit_ = time_unit;
 470                 time_unit_changed();
 471         }
 472 }
 473
 474 void View::zoom(double steps)
 475 {
 476         zoom(steps, viewport_->width() / 2);
 477 }
 478
 479 void View::zoom(double steps, int offset)
 480 {
 481         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 482 }
 483
 484 void View::zoom_fit(bool gui_state)
 485 {
 486         // Act as one-shot when stopped, toggle along with the GUI otherwise
 487         if (session_.get_capture_state() == Session::Stopped) {
 488                 always_zoom_to_fit_ = false;
 489                 always_zoom_to_fit_changed(false);
 490         } else {
 491                 always_zoom_to_fit_ = gui_state;
 492                 always_zoom_to_fit_changed(gui_state);
 493         }
 494
 495         const pair<Timestamp, Timestamp> extents = get_time_extents();
 496         const Timestamp delta = extents.second - extents.first;
 497         if (delta < Timestamp("1e-12"))
 498                 return;
 499
 500         assert(viewport_);
 501         const int w = viewport_->width();
 502         if (w <= 0)
 503                 return;
 504
 505         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 506         set_scale_offset(scale.convert_to<double>(), extents.first);
 507 }
 508
 509 void View::zoom_one_to_one()
 510 {
 511         using pv::data::SignalData;
 512
 513         // Make a set of all the visible data objects
 514         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 515         if (visible_data.empty())
 516                 return;
 517
 518         assert(viewport_);
 519         const int w = viewport_->width();
 520         if (w <= 0)
 521                 return;
 522
 523         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 524 }
 525
 526 void View::set_scale_offset(double scale, const Timestamp& offset)
 527 {
 528         // Disable sticky scrolling / always zoom to fit when acquisition runs
 529         // and user drags the viewport
 530         if ((scale_ == scale) && (offset_ != offset) &&
 531                         (session_.get_capture_state() == Session::Running)) {
 532
 533                 if (sticky_scrolling_) {
 534                         sticky_scrolling_ = false;
 535                         sticky_scrolling_changed(false);
 536                 }
 537
 538                 if (always_zoom_to_fit_) {
 539                         always_zoom_to_fit_ = false;
 540                         always_zoom_to_fit_changed(false);
 541                 }
 542         }
 543
 544         set_scale(scale);
 545         set_offset(offset);
 546
 547         calculate_tick_spacing();
 548
 549         update_scroll();
 550         ruler_->update();
 551         viewport_->update();
 552 }
 553
 554 set< shared_ptr<SignalData> > View::get_visible_data() const
 555 {
 556         // Make a set of all the visible data objects
 557         set< shared_ptr<SignalData> > visible_data;
 558         for (const shared_ptr<Signal> sig : signals_)
 559                 if (sig->enabled())
 560                         visible_data.insert(sig->data());
 561
 562         return visible_data;
 563 }
 564
 565 pair<Timestamp, Timestamp> View::get_time_extents() const
 566 {
 567         boost::optional<Timestamp> left_time, right_time;
 568         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 569         for (const shared_ptr<SignalData> d : visible_data) {
 570                 const vector< shared_ptr<Segment> > segments = d->segments();
 571                 for (const shared_ptr<Segment> &s : segments) {
 572                         double samplerate = s->samplerate();
 573                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 574
 575                         const Timestamp start_time = s->start_time();
 576                         left_time = left_time ?
 577                                 min(*left_time, start_time) :
 578                                                 start_time;
 579                         right_time = right_time ?
 580                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 581                                                  start_time + d->max_sample_count() / samplerate;
 582                 }
 583         }
 584
 585         if (!left_time || !right_time)
 586                 return make_pair(0, 0);
 587
 588         assert(*left_time < *right_time);
 589         return make_pair(*left_time, *right_time);
 590 }
 591
 592 void View::enable_show_sampling_points(bool state)
 593 {
 594         (void)state;
 595
 596         viewport_->update();
 597 }
 598
 599 void View::enable_show_analog_minor_grid(bool state)
 600 {
 601         (void)state;
 602
 603         viewport_->update();
 604 }
 605
 606 void View::enable_coloured_bg(bool state)
 607 {
 608         coloured_bg_ = state;
 609         viewport_->update();
 610 }
 611
 612 bool View::coloured_bg() const
 613 {
 614         return coloured_bg_;
 615 }
 616
 617 bool View::cursors_shown() const
 618 {
 619         return show_cursors_;
 620 }
 621
 622 void View::show_cursors(bool show)
 623 {
 624         show_cursors_ = show;
 625         ruler_->update();
 626         viewport_->update();
 627 }
 628
 629 void View::centre_cursors()
 630 {
 631         const double time_width = scale_ * viewport_->width();
 632         cursors_->first()->set_time(offset_ + time_width * 0.4);
 633         cursors_->second()->set_time(offset_ + time_width * 0.6);
 634         ruler_->update();
 635         viewport_->update();
 636 }
 637
 638 shared_ptr<CursorPair> View::cursors() const
 639 {
 640         return cursors_;
 641 }
 642
 643 void View::add_flag(const Timestamp& time)
 644 {
 645         flags_.push_back(make_shared<Flag>(*this, time,
 646                 QString("%1").arg(next_flag_text_)));
 647
 648         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 649                 (next_flag_text_ + 1);
 650
 651         time_item_appearance_changed(true, true);
 652 }
 653
 654 void View::remove_flag(shared_ptr<Flag> flag)
 655 {
 656         flags_.remove(flag);
 657         time_item_appearance_changed(true, true);
 658 }
 659
 660 vector< shared_ptr<Flag> > View::flags() const
 661 {
 662         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 663         stable_sort(flags.begin(), flags.end(),
 664                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 665                         return a->time() < b->time();
 666                 });
 667
 668         return flags;
 669 }
 670
 671 const QPoint& View::hover_point() const
 672 {
 673         return hover_point_;
 674 }
 675
 676 void View::restack_all_trace_tree_items()
 677 {
 678         // Make a list of owners that is sorted from deepest first
 679         const vector<shared_ptr<TraceTreeItem>> items(
 680                 list_by_type<TraceTreeItem>());
 681         set< TraceTreeItemOwner* > owners;
 682         for (const auto &r : items)
 683                 owners.insert(r->owner());
 684         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 685         sort(sorted_owners.begin(), sorted_owners.end(),
 686                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 687                         return a->depth() > b->depth(); });
 688
 689         // Restack the items recursively
 690         for (auto &o : sorted_owners)
 691                 o->restack_items();
 692
 693         // Animate the items to their destination
 694         for (const auto &i : items)
 695                 i->animate_to_layout_v_offset();
 696 }
 697
 698 void View::trigger_event(util::Timestamp location)
 699 {
 700         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 701 }
 702
 703 void View::get_scroll_layout(double &length, Timestamp &offset) const
 704 {
 705         const pair<Timestamp, Timestamp> extents = get_time_extents();
 706         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 707         offset = offset_ / scale_;
 708 }
 709
 710 void View::set_zoom(double scale, int offset)
 711 {
 712         // Reset the "always zoom to fit" feature as the user changed the zoom
 713         always_zoom_to_fit_ = false;
 714         always_zoom_to_fit_changed(false);
 715
 716         const Timestamp cursor_offset = offset_ + scale_ * offset;
 717         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 718         const Timestamp new_offset = cursor_offset - new_scale * offset;
 719         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 720 }
 721
 722 void View::calculate_tick_spacing()
 723 {
 724         const double SpacingIncrement = 10.0f;
 725         const double MinValueSpacing = 40.0f;
 726
 727         // Figure out the highest numeric value visible on a label
 728         const QSize areaSize = viewport_->size();
 729         const Timestamp max_time = max(fabs(offset_),
 730                 fabs(offset_ + scale_ * areaSize.width()));
 731
 732         double min_width = SpacingIncrement;
 733         double label_width, tick_period_width;
 734
 735         QFontMetrics m(QApplication::font());
 736
 737         // Copies of the member variables with the same name, used in the calculation
 738         // and written back afterwards, so that we don't emit signals all the time
 739         // during the calculation.
 740         pv::util::Timestamp tick_period = tick_period_;
 741         pv::util::SIPrefix tick_prefix = tick_prefix_;
 742         unsigned tick_precision = tick_precision_;
 743
 744         do {
 745                 const double min_period = scale_ * min_width;
 746
 747                 const int order = (int)floorf(log10f(min_period));
 748                 const pv::util::Timestamp order_decimal =
 749                         pow(pv::util::Timestamp(10), order);
 750
 751                 // Allow for a margin of error so that a scale unit of 1 can be used.
 752                 // Otherwise, for a SU of 1 the tick period will almost always be below
 753                 // the min_period by a small amount - and thus skipped in favor of 2.
 754                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 755                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 756                 double tp_with_margin;
 757                 unsigned int unit = 0;
 758
 759                 do {
 760                         tp_with_margin = order_decimal.convert_to<double>() *
 761                                 (ScaleUnits[unit++] + tp_margin);
 762                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 763
 764                 tick_period = order_decimal * ScaleUnits[unit - 1];
 765                 tick_prefix = static_cast<pv::util::SIPrefix>(
 766                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 767
 768                 // Precision is the number of fractional digits required, not
 769                 // taking the prefix into account (and it must never be negative)
 770                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 771
 772                 tick_period_width = (tick_period / scale_).convert_to<double>();
 773
 774                 const QString label_text = Ruler::format_time_with_distance(
 775                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 776
 777                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 778                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 779                                 MinValueSpacing;
 780
 781                 min_width += SpacingIncrement;
 782         } while (tick_period_width < label_width);
 783
 784         set_tick_period(tick_period);
 785         set_tick_prefix(tick_prefix);
 786         set_tick_precision(tick_precision);
 787 }
 788
 789 void View::adjust_top_margin()
 790 {
 791         assert(viewport_);
 792
 793         const QSize areaSize = viewport_->size();
 794
 795         const pair<int, int> extents = v_extents();
 796         const int top_margin = owner_visual_v_offset() + extents.first;
 797         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
 798
 799         // Do we have empty space at the top while the last trace goes out of screen?
 800         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
 801                 const int trace_height = extents.second - extents.first;
 802
 803                 // Center everything vertically if there is enough space
 804                 if (areaSize.height() >= trace_height)
 805                         set_v_offset(extents.first -
 806                                 ((areaSize.height() - trace_height) / 2));
 807                 else
 808                         // Remove the top margin to make as many traces fit on screen as possible
 809                         set_v_offset(extents.first);
 810         }
 811 }
 812
 813 void View::update_scroll()
 814 {
 815         assert(viewport_);
 816         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
 817         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
 818
 819         const QSize areaSize = viewport_->size();
 820
 821         // Set the horizontal scroll bar
 822         double length = 0;
 823         Timestamp offset;
 824         get_scroll_layout(length, offset);
 825         length = max(length - areaSize.width(), 0.0);
 826
 827         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
 828
 829         hscrollbar->setPageStep(areaSize.width() / 2);
 830         hscrollbar->setSingleStep(major_tick_distance);
 831
 832         updating_scroll_ = true;
 833
 834         if (length < MaxScrollValue) {
 835                 hscrollbar->setRange(0, length);
 836                 hscrollbar->setSliderPosition(offset.convert_to<double>());
 837         } else {
 838                 hscrollbar->setRange(0, MaxScrollValue);
 839                 hscrollbar->setSliderPosition(
 840                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
 841         }
 842
 843         updating_scroll_ = false;
 844
 845         // Set the vertical scrollbar
 846         vscrollbar->setPageStep(areaSize.height());
 847         vscrollbar->setSingleStep(areaSize.height() / 8);
 848
 849         const pair<int, int> extents = v_extents();
 850
 851         // Don't change the scrollbar range if there are no traces
 852         if (extents.first != extents.second)
 853                 vscrollbar->setRange(extents.first - areaSize.height(),
 854                         extents.second);
 855
 856         if (scroll_needs_defaults_)
 857                 set_scroll_default();
 858 }
 859
 860 void View::reset_scroll()
 861 {
 862         scrollarea_->verticalScrollBar()->setRange(0, 0);
 863 }
 864
 865 void View::set_scroll_default()
 866 {
 867         assert(viewport_);
 868
 869         const QSize areaSize = viewport_->size();
 870
 871         const pair<int, int> extents = v_extents();
 872         const int trace_height = extents.second - extents.first;
 873
 874         // Do all traces fit in the view?
 875         if (areaSize.height() >= trace_height)
 876                 // Center all traces vertically
 877                 set_v_offset(extents.first -
 878                         ((areaSize.height() - trace_height) / 2));
 879         else
 880                 // Put the first trace at the top, letting the bottom ones overflow
 881                 set_v_offset(extents.first);
 882 }
 883
 884 bool View::header_was_shrunk() const
 885 {
 886         const int header_pane_width = splitter_->sizes().front();
 887         const int header_width = header_->extended_size_hint().width();
 888
 889         // Allow for a slight margin of error so that we also accept
 890         // slight differences when e.g. a label name change increased
 891         // the overall width
 892         return (header_pane_width < (header_width - 10));
 893 }
 894
 895 void View::expand_header_to_fit()
 896 {
 897         int splitter_area_width = 0;
 898         for (int w : splitter_->sizes())
 899                 splitter_area_width += w;
 900
 901         // Make sure the header has enough horizontal space to show all labels fully
 902         QList<int> pane_sizes;
 903         pane_sizes.push_back(header_->extended_size_hint().width());
 904         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
 905         splitter_->setSizes(pane_sizes);
 906 }
 907
 908 void View::update_layout()
 909 {
 910         update_scroll();
 911 }
 912
 913 TraceTreeItemOwner* View::find_prevalent_trace_group(
 914         const shared_ptr<sigrok::ChannelGroup> &group,
 915         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
 916                 &signal_map)
 917 {
 918         assert(group);
 919
 920         unordered_set<TraceTreeItemOwner*> owners;
 921         vector<TraceTreeItemOwner*> owner_list;
 922
 923         // Make a set and a list of all the owners
 924         for (const auto &channel : group->channels()) {
 925                 for (auto entry : signal_map) {
 926                         if (entry.first->channel() == channel) {
 927                                 TraceTreeItemOwner *const o = (entry.second)->owner();
 928                                 owner_list.push_back(o);
 929                                 owners.insert(o);
 930                         }
 931                 }
 932         }
 933
 934         // Iterate through the list of owners, and find the most prevalent
 935         size_t max_prevalence = 0;
 936         TraceTreeItemOwner *prevalent_owner = nullptr;
 937         for (TraceTreeItemOwner *owner : owners) {
 938                 const size_t prevalence = count_if(
 939                         owner_list.begin(), owner_list.end(),
 940                         [&](TraceTreeItemOwner *o) { return o == owner; });
 941                 if (prevalence > max_prevalence) {
 942                         max_prevalence = prevalence;
 943                         prevalent_owner = owner;
 944                 }
 945         }
 946
 947         return prevalent_owner;
 948 }
 949
 950 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
 951         const vector< shared_ptr<sigrok::Channel> > &channels,
 952         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
 953                 &signal_map,
 954         set< shared_ptr<Trace> > &add_list)
 955 {
 956         vector< shared_ptr<Trace> > filtered_traces;
 957
 958         for (const auto &channel : channels) {
 959                 for (auto entry : signal_map) {
 960                         if (entry.first->channel() == channel) {
 961                                 shared_ptr<Trace> trace = entry.second;
 962                                 const auto list_iter = add_list.find(trace);
 963                                 if (list_iter == add_list.end())
 964                                         continue;
 965
 966                                 filtered_traces.push_back(trace);
 967                                 add_list.erase(list_iter);
 968                         }
 969                 }
 970         }
 971
 972         return filtered_traces;
 973 }
 974
 975 void View::determine_time_unit()
 976 {
 977         // Check whether we know the sample rate and hence can use time as the unit
 978         if (time_unit_ == util::TimeUnit::Samples) {
 979                 // Check all signals but...
 980                 for (const shared_ptr<Signal> signal : signals_) {
 981                         const shared_ptr<SignalData> data = signal->data();
 982
 983                         // ...only check first segment of each
 984                         const vector< shared_ptr<Segment> > segments = data->segments();
 985                         if (!segments.empty())
 986                                 if (segments[0]->samplerate()) {
 987                                         set_time_unit(util::TimeUnit::Time);
 988                                         break;
 989                                 }
 990                 }
 991         }
 992 }
 993
 994 bool View::eventFilter(QObject *object, QEvent *event)
 995 {
 996         const QEvent::Type type = event->type();
 997         if (type == QEvent::MouseMove) {
 998
 999                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1000                 if (object == viewport_)
1001                         hover_point_ = mouse_event->pos();
1002                 else if (object == ruler_)
1003                         hover_point_ = QPoint(mouse_event->x(), 0);
1004                 else if (object == header_)
1005                         hover_point_ = QPoint(0, mouse_event->y());
1006                 else
1007                         hover_point_ = QPoint(-1, -1);
1008
1009                 hover_point_changed();
1010
1011         } else if (type == QEvent::Leave) {
1012                 hover_point_ = QPoint(-1, -1);
1013                 hover_point_changed();
1014         } else if (type == QEvent::Show) {
1015
1016                 // This is somewhat of a hack, unfortunately. We cannot use
1017                 // set_v_offset() from within restore_settings() as the view
1018                 // at that point is neither visible nor properly sized.
1019                 // This is the least intrusive workaround I could come up
1020                 // with: set the vertical offset (or scroll defaults) when
1021                 // the view is shown, which happens after all widgets were
1022                 // resized to their final sizes.
1023                 update_layout();
1024
1025                 if (!settings_restored_)
1026                         expand_header_to_fit();
1027
1028                 if (scroll_needs_defaults_) {
1029                         set_scroll_default();
1030                         scroll_needs_defaults_ = false;
1031                 }
1032
1033                 if (saved_v_offset_) {
1034                         set_v_offset(saved_v_offset_);
1035                         saved_v_offset_ = 0;
1036                 }
1037         }
1038
1039         return QObject::eventFilter(object, event);
1040 }
1041
1042 void View::resizeEvent(QResizeEvent* event)
1043 {
1044         // Only adjust the top margin if we shrunk vertically
1045         if (event->size().height() < event->oldSize().height())
1046                 adjust_top_margin();
1047
1048         update_layout();
1049 }
1050
1051 void View::row_item_appearance_changed(bool label, bool content)
1052 {
1053         if (label)
1054                 header_->update();
1055         if (content)
1056                 viewport_->update();
1057 }
1058
1059 void View::time_item_appearance_changed(bool label, bool content)
1060 {
1061         if (label) {
1062                 ruler_->update();
1063
1064                 // Make sure the header pane width is updated, too
1065                 update_layout();
1066         }
1067
1068         if (content)
1069                 viewport_->update();
1070 }
1071
1072 void View::extents_changed(bool horz, bool vert)
1073 {
1074         sticky_events_ |=
1075                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1076                 (vert ? TraceTreeItemVExtentsChanged : 0);
1077
1078         lazy_event_handler_.start();
1079 }
1080
1081 void View::on_splitter_moved()
1082 {
1083         // Setting the maximum width of the header widget doesn't work as
1084         // expected because the splitter would allow the user to make the
1085         // pane wider than that, creating empty space as a result.
1086         // To make this work, we stricly enforce the maximum width by
1087         // expanding the header unless the user shrunk it on purpose.
1088         // As we're then setting the width of the header pane, we set the
1089         // splitter to the maximum allowed position.
1090         if (!header_was_shrunk())
1091                 expand_header_to_fit();
1092 }
1093
1094 void View::h_scroll_value_changed(int value)
1095 {
1096         if (updating_scroll_)
1097                 return;
1098
1099         // Disable sticky scrolling when user moves the horizontal scroll bar
1100         // during a running acquisition
1101         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1102                 sticky_scrolling_ = false;
1103                 sticky_scrolling_changed(false);
1104         }
1105
1106         const int range = scrollarea_->horizontalScrollBar()->maximum();
1107         if (range < MaxScrollValue)
1108                 set_offset(scale_ * value);
1109         else {
1110                 double length = 0;
1111                 Timestamp offset;
1112                 get_scroll_layout(length, offset);
1113                 set_offset(scale_ * length * value / MaxScrollValue);
1114         }
1115
1116         ruler_->update();
1117         viewport_->update();
1118 }
1119
1120 void View::v_scroll_value_changed()
1121 {
1122         header_->update();
1123         viewport_->update();
1124 }
1125
1126 void View::signals_changed()
1127 {
1128         using sigrok::Channel;
1129
1130         vector< shared_ptr<Channel> > channels;
1131         shared_ptr<sigrok::Device> sr_dev;
1132
1133         // Do we need to set the vertical scrollbar to its default position later?
1134         // We do if there are no traces, i.e. the scroll bar has no range set
1135         bool reset_scrollbar =
1136                 (scrollarea_->verticalScrollBar()->minimum() ==
1137                         scrollarea_->verticalScrollBar()->maximum());
1138
1139         if (!session_.device()) {
1140                 reset_scroll();
1141                 signals_.clear();
1142         } else {
1143                 sr_dev = session_.device()->device();
1144                 assert(sr_dev);
1145                 channels = sr_dev->channels();
1146         }
1147
1148         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1149
1150         // Make a list of traces that are being added, and a list of traces
1151         // that are being removed
1152         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1153         const set<shared_ptr<Trace>> prev_traces(
1154                 prev_trace_list.begin(), prev_trace_list.end());
1155
1156         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1157
1158 #ifdef ENABLE_DECODE
1159         traces.insert(decode_traces_.begin(), decode_traces_.end());
1160 #endif
1161
1162         set< shared_ptr<Trace> > add_traces;
1163         set_difference(traces.begin(), traces.end(),
1164                 prev_traces.begin(), prev_traces.end(),
1165                 inserter(add_traces, add_traces.begin()));
1166
1167         set< shared_ptr<Trace> > remove_traces;
1168         set_difference(prev_traces.begin(), prev_traces.end(),
1169                 traces.begin(), traces.end(),
1170                 inserter(remove_traces, remove_traces.begin()));
1171
1172         // Make a look-up table of sigrok Channels to pulseview Signals
1173         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1174                 signal_map;
1175         for (const shared_ptr<Signal> &sig : signals_)
1176                 signal_map[sig->base()] = sig;
1177
1178         // Populate channel groups
1179         if (sr_dev)
1180                 for (auto entry : sr_dev->channel_groups()) {
1181                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1182
1183                         if (group->channels().size() <= 1)
1184                                 continue;
1185
1186                         // Find best trace group to add to
1187                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1188                                 group, signal_map);
1189
1190                         // If there is no trace group, create one
1191                         shared_ptr<TraceGroup> new_trace_group;
1192                         if (!owner) {
1193                                 new_trace_group.reset(new TraceGroup());
1194                                 owner = new_trace_group.get();
1195                         }
1196
1197                         // Extract traces for the trace group, removing them from
1198                         // the add list
1199                         const vector< shared_ptr<Trace> > new_traces_in_group =
1200                                 extract_new_traces_for_channels(group->channels(),
1201                                         signal_map, add_traces);
1202
1203                         // Add the traces to the group
1204                         const pair<int, int> prev_v_extents = owner->v_extents();
1205                         int offset = prev_v_extents.second - prev_v_extents.first;
1206                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1207                                 assert(trace);
1208                                 owner->add_child_item(trace);
1209
1210                                 const pair<int, int> extents = trace->v_extents();
1211                                 if (trace->enabled())
1212                                         offset += -extents.first;
1213                                 trace->force_to_v_offset(offset);
1214                                 if (trace->enabled())
1215                                         offset += extents.second;
1216                         }
1217
1218                         if (new_trace_group) {
1219                                 // Assign proper vertical offsets to each channel in the group
1220                                 new_trace_group->restack_items();
1221
1222                                 // If this is a new group, enqueue it in the new top level
1223                                 // items list
1224                                 if (!new_traces_in_group.empty())
1225                                         new_top_level_items.push_back(new_trace_group);
1226                         }
1227                 }
1228
1229         // Enqueue the remaining logic channels in a group
1230         vector< shared_ptr<Channel> > logic_channels;
1231         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1232                 [](const shared_ptr<Channel>& c) {
1233                         return c->type() == sigrok::ChannelType::LOGIC; });
1234
1235         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1236                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1237
1238         if (non_grouped_logic_signals.size() > 0) {
1239                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1240                         make_shared<TraceGroup>());
1241                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1242                         non_grouped_trace_group->add_child_item(trace);
1243
1244                 non_grouped_trace_group->restack_items();
1245                 new_top_level_items.push_back(non_grouped_trace_group);
1246         }
1247
1248         // Enqueue the remaining channels as free ungrouped traces
1249         const vector< shared_ptr<Trace> > new_top_level_signals =
1250                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1251         new_top_level_items.insert(new_top_level_items.end(),
1252                 new_top_level_signals.begin(), new_top_level_signals.end());
1253
1254         // Enqueue any remaining traces i.e. decode traces
1255         new_top_level_items.insert(new_top_level_items.end(),
1256                 add_traces.begin(), add_traces.end());
1257
1258         // Remove any removed traces
1259         for (shared_ptr<Trace> trace : remove_traces) {
1260                 TraceTreeItemOwner *const owner = trace->owner();
1261                 assert(owner);
1262                 owner->remove_child_item(trace);
1263         }
1264
1265         // Remove any empty trace groups
1266         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1267                 if (group->child_items().size() == 0) {
1268                         remove_child_item(group);
1269                         group.reset();
1270                 }
1271
1272         // Add and position the pending top levels items
1273         int offset = v_extents().second;
1274         for (auto item : new_top_level_items) {
1275                 add_child_item(item);
1276
1277                 // Position the item after the last item or at the top if there is none
1278                 const pair<int, int> extents = item->v_extents();
1279
1280                 if (item->enabled())
1281                         offset += -extents.first;
1282
1283                 item->force_to_v_offset(offset);
1284
1285                 if (item->enabled())
1286                         offset += extents.second;
1287         }
1288
1289
1290         if (!new_top_level_items.empty())
1291                 // Expand the header pane because the header should become fully
1292                 // visible when new signals are added
1293                 expand_header_to_fit();
1294
1295         update_layout();
1296
1297         header_->update();
1298         viewport_->update();
1299
1300         if (reset_scrollbar)
1301                 set_scroll_default();
1302 }
1303
1304 void View::capture_state_updated(int state)
1305 {
1306         GlobalSettings settings;
1307
1308         if (state == Session::Running) {
1309                 set_time_unit(util::TimeUnit::Samples);
1310
1311                 trigger_markers_.clear();
1312
1313                 scale_at_acq_start_ = scale_;
1314                 offset_at_acq_start_ = offset_;
1315
1316                 // Activate "always zoom to fit" if the setting is enabled and we're
1317                 // the main view of this session (other trace views may be used for
1318                 // zooming and we don't want to mess them up)
1319                 bool state = settings.value(GlobalSettings::Key_View_AlwaysZoomToFit).toBool();
1320                 if (is_main_view_ && state) {
1321                         always_zoom_to_fit_ = true;
1322                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1323                 }
1324
1325                 // Enable sticky scrolling if the setting is enabled
1326                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1327         }
1328
1329         if (state == Session::Stopped) {
1330                 // After acquisition has stopped we need to re-calculate the ticks once
1331                 // as it's otherwise done when the user pans or zooms, which is too late
1332                 calculate_tick_spacing();
1333
1334                 // Reset "always zoom to fit", the acquisition has stopped
1335                 if (always_zoom_to_fit_) {
1336                         // Perform a final zoom-to-fit before disabling
1337                         zoom_fit(always_zoom_to_fit_);
1338                         always_zoom_to_fit_ = false;
1339                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1340                 }
1341
1342                 bool zoom_to_fit_after_acq =
1343                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1344
1345                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1346                 // we didn't restore settings in the meanwhile
1347                 if (zoom_to_fit_after_acq &&
1348                         !suppress_zoom_to_fit_after_acq_ &&
1349                         (scale_ == scale_at_acq_start_) &&
1350                         (offset_ == offset_at_acq_start_))
1351                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1352
1353                 suppress_zoom_to_fit_after_acq_ = false;
1354         }
1355 }
1356
1357 void View::perform_delayed_view_update()
1358 {
1359         if (always_zoom_to_fit_) {
1360                 zoom_fit(true);
1361         } else if (sticky_scrolling_) {
1362                 // Make right side of the view sticky
1363                 double length = 0;
1364                 Timestamp offset;
1365                 get_scroll_layout(length, offset);
1366
1367                 const QSize areaSize = viewport_->size();
1368                 length = max(length - areaSize.width(), 0.0);
1369
1370                 set_offset(scale_ * length);
1371         }
1372
1373         determine_time_unit();
1374         update_scroll();
1375         ruler_->update();
1376         viewport_->update();
1377 }
1378
1379 void View::process_sticky_events()
1380 {
1381         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1382                 update_layout();
1383         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1384                 restack_all_trace_tree_items();
1385                 update_scroll();
1386         }
1387
1388         // Clear the sticky events
1389         sticky_events_ = 0;
1390 }
1391
1392 void View::on_hover_point_changed()
1393 {
1394         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1395                 list_by_type<TraceTreeItem>());
1396         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1397                 r->hover_point_changed();
1398 }
1399
1400 } // namespace trace
1401 } // namespace views
1402 } // namespace pv