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 <QMenu>
  42 #include <QMouseEvent>
  43 #include <QScrollBar>
  44 #include <QVBoxLayout>
  45
  46 #include <libsigrokcxx/libsigrokcxx.hpp>
  47
  48 #include "analogsignal.hpp"
  49 #include "header.hpp"
  50 #include "logicsignal.hpp"
  51 #include "ruler.hpp"
  52 #include "signal.hpp"
  53 #include "tracegroup.hpp"
  54 #include "triggermarker.hpp"
  55 #include "view.hpp"
  56 #include "viewport.hpp"
  57
  58 #include "pv/data/logic.hpp"
  59 #include "pv/data/logicsegment.hpp"
  60 #include "pv/devices/device.hpp"
  61 #include "pv/globalsettings.hpp"
  62 #include "pv/session.hpp"
  63 #include "pv/util.hpp"
  64
  65 #ifdef ENABLE_DECODE
  66 #include "decodetrace.hpp"
  67 #endif
  68
  69 using pv::data::SignalData;
  70 using pv::data::Segment;
  71 using pv::util::TimeUnit;
  72 using pv::util::Timestamp;
  73
  74 using std::back_inserter;
  75 using std::copy_if;
  76 using std::count_if;
  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
 129         // Note: Place defaults in View::reset_view_state(), not here
 130         splitter_(new QSplitter()),
 131         header_was_shrunk_(false),  // The splitter remains unchanged after a reset, so this goes here
 132         sticky_scrolling_(false)  // Default setting is set in MainWindow::setup_ui()
 133 {
 134         QVBoxLayout *root_layout = new QVBoxLayout(this);
 135         root_layout->setContentsMargins(0, 0, 0, 0);
 136         root_layout->addWidget(splitter_);
 137
 138         viewport_ = new Viewport(*this);
 139         scrollarea_ = new CustomScrollArea(splitter_);
 140         scrollarea_->setViewport(viewport_);
 141         scrollarea_->setFrameShape(QFrame::NoFrame);
 142
 143         ruler_ = new Ruler(*this);
 144
 145         header_ = new Header(*this);
 146         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 147
 148         // We put the header into a simple layout so that we can add the top margin,
 149         // allowing us to make it line up with the bottom of the ruler
 150         QWidget *header_container = new QWidget();
 151         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 152         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 153         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 154         header_layout->addWidget(header_);
 155
 156         // To let the ruler and scrollarea be on the same split pane, we need a layout
 157         QWidget *trace_container = new QWidget();
 158         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 159         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 160         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 161         trace_layout->setContentsMargins(0, 0, 0, 0);
 162         trace_layout->addWidget(ruler_);
 163         trace_layout->addWidget(scrollarea_);
 164
 165         splitter_->addWidget(header_container);
 166         splitter_->addWidget(trace_container);
 167         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 168         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 169         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 170         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 171         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 172         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 173
 174         viewport_->installEventFilter(this);
 175         ruler_->installEventFilter(this);
 176         header_->installEventFilter(this);
 177
 178         // Set up settings and event handlers
 179         GlobalSettings settings;
 180         colored_bg_ = settings.value(GlobalSettings::Key_View_ColoredBG).toBool();
 181
 182         GlobalSettings::add_change_handler(this);
 183
 184         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 185                 this, SLOT(h_scroll_value_changed(int)));
 186         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 187                 this, SLOT(v_scroll_value_changed()));
 188
 189         connect(header_, SIGNAL(selection_changed()),
 190                 ruler_, SLOT(clear_selection()));
 191         connect(ruler_, SIGNAL(selection_changed()),
 192                 header_, SLOT(clear_selection()));
 193
 194         connect(header_, SIGNAL(selection_changed()),
 195                 this, SIGNAL(selection_changed()));
 196         connect(ruler_, SIGNAL(selection_changed()),
 197                 this, SIGNAL(selection_changed()));
 198
 199         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 200                 this, SLOT(on_splitter_moved()));
 201
 202         connect(&lazy_event_handler_, SIGNAL(timeout()),
 203                 this, SLOT(process_sticky_events()));
 204         lazy_event_handler_.setSingleShot(true);
 205
 206         // Trigger the initial event manually. The default device has signals
 207         // which were created before this object came into being
 208         signals_changed();
 209
 210         // make sure the transparent widgets are on the top
 211         ruler_->raise();
 212         header_->raise();
 213
 214         reset_view_state();
 215 }
 216
 217 View::~View()
 218 {
 219         GlobalSettings::remove_change_handler(this);
 220 }
 221
 222 void View::reset_view_state()
 223 {
 224         ViewBase::reset_view_state();
 225
 226         segment_display_mode_ = Trace::ShowLastSegmentOnly;
 227         segment_selectable_ = false;
 228         scale_ = 1e-3;
 229         offset_ = 0;
 230         ruler_offset_ = 0;
 231         updating_scroll_ = false;
 232         settings_restored_ = false;
 233         always_zoom_to_fit_ = false;
 234         tick_period_ = 0;
 235         tick_prefix_ = pv::util::SIPrefix::yocto;
 236         tick_precision_ = 0;
 237         time_unit_ = util::TimeUnit::Time;
 238         show_cursors_ = false;
 239         cursors_ = make_shared<CursorPair>(*this);
 240         next_flag_text_ = 'A';
 241         trigger_markers_.clear();
 242         hover_point_ = QPoint(-1, -1);
 243         scroll_needs_defaults_ = true;
 244         saved_v_offset_ = 0;
 245         scale_at_acq_start_ = 0;
 246         offset_at_acq_start_ = 0;
 247         suppress_zoom_to_fit_after_acq_ = false;
 248
 249         show_cursors_ = false;
 250         cursor_state_changed(show_cursors_);
 251         flags_.clear();
 252
 253         // Update the zoom state
 254         calculate_tick_spacing();
 255
 256         // Make sure the standard bar's segment selector is in sync
 257         set_segment_display_mode(segment_display_mode_);
 258 }
 259
 260 Session& View::session()
 261 {
 262         return session_;
 263 }
 264
 265 const Session& View::session() const
 266 {
 267         return session_;
 268 }
 269
 270 unordered_set< shared_ptr<Signal> > View::signals() const
 271 {
 272         return signals_;
 273 }
 274
 275 void View::clear_signals()
 276 {
 277         ViewBase::clear_signalbases();
 278         signals_.clear();
 279 }
 280
 281 void View::add_signal(const shared_ptr<Signal> signal)
 282 {
 283         ViewBase::add_signalbase(signal->base());
 284         signals_.insert(signal);
 285
 286         signal->set_segment_display_mode(segment_display_mode_);
 287         signal->set_current_segment(current_segment_);
 288
 289         connect(signal->base().get(), SIGNAL(name_changed(const QString&)),
 290                 this, SLOT(on_signal_name_changed()));
 291 }
 292
 293 #ifdef ENABLE_DECODE
 294 void View::clear_decode_signals()
 295 {
 296         decode_traces_.clear();
 297 }
 298
 299 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 300 {
 301         shared_ptr<DecodeTrace> d(
 302                 new DecodeTrace(session_, signal, decode_traces_.size()));
 303         decode_traces_.push_back(d);
 304
 305         d->set_segment_display_mode(segment_display_mode_);
 306         d->set_current_segment(current_segment_);
 307
 308         connect(signal.get(), SIGNAL(name_changed(const QString&)),
 309                 this, SLOT(on_signal_name_changed()));
 310 }
 311
 312 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 313 {
 314         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 315                 if ((*i)->base() == signal) {
 316                         decode_traces_.erase(i);
 317                         signals_changed();
 318                         return;
 319                 }
 320 }
 321 #endif
 322
 323 shared_ptr<Signal> View::get_signal_under_mouse_cursor() const
 324 {
 325         return signal_under_mouse_cursor_;
 326 }
 327
 328 View* View::view()
 329 {
 330         return this;
 331 }
 332
 333 const View* View::view() const
 334 {
 335         return this;
 336 }
 337
 338 Viewport* View::viewport()
 339 {
 340         return viewport_;
 341 }
 342
 343 const Viewport* View::viewport() const
 344 {
 345         return viewport_;
 346 }
 347
 348 void View::save_settings(QSettings &settings) const
 349 {
 350         settings.setValue("scale", scale_);
 351         settings.setValue("v_offset",
 352                 scrollarea_->verticalScrollBar()->sliderPosition());
 353
 354         settings.setValue("splitter_state", splitter_->saveState());
 355         settings.setValue("segment_display_mode", segment_display_mode_);
 356
 357         {
 358                 stringstream ss;
 359                 boost::archive::text_oarchive oa(ss);
 360                 oa << boost::serialization::make_nvp("ruler_shift", ruler_shift_);
 361                 settings.setValue("ruler_shift", QString::fromStdString(ss.str()));
 362         }
 363         {
 364                 stringstream ss;
 365                 boost::archive::text_oarchive oa(ss);
 366                 oa << boost::serialization::make_nvp("offset", offset_);
 367                 settings.setValue("offset", QString::fromStdString(ss.str()));
 368         }
 369
 370         for (shared_ptr<Signal> signal : signals_) {
 371                 settings.beginGroup(signal->base()->internal_name());
 372                 signal->save_settings(settings);
 373                 settings.endGroup();
 374         }
 375 }
 376
 377 void View::restore_settings(QSettings &settings)
 378 {
 379         // Note: It is assumed that this function is only called once,
 380         // immediately after restoring a previous session.
 381
 382         if (settings.contains("scale"))
 383                 set_scale(settings.value("scale").toDouble());
 384
 385         if (settings.contains("ruler_shift")) {
 386                 util::Timestamp shift;
 387                 stringstream ss;
 388                 ss << settings.value("ruler_shift").toString().toStdString();
 389
 390                 try {
 391                         boost::archive::text_iarchive ia(ss);
 392                         ia >> boost::serialization::make_nvp("ruler_shift", shift);
 393                         ruler_shift_ = shift;
 394                 } catch (boost::archive::archive_exception&) {
 395                         qDebug() << "Could not restore the view ruler shift";
 396                 }
 397         }
 398
 399         if (settings.contains("offset")) {
 400                 util::Timestamp offset;
 401                 stringstream ss;
 402                 ss << settings.value("offset").toString().toStdString();
 403
 404                 try {
 405                         boost::archive::text_iarchive ia(ss);
 406                         ia >> boost::serialization::make_nvp("offset", offset);
 407                         // This also updates ruler_offset_
 408                         set_offset(offset);
 409                 } catch (boost::archive::archive_exception&) {
 410                         qDebug() << "Could not restore the view offset";
 411                 }
 412         }
 413
 414         if (settings.contains("splitter_state"))
 415                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 416
 417         if (settings.contains("segment_display_mode"))
 418                 set_segment_display_mode(
 419                         (Trace::SegmentDisplayMode)(settings.value("segment_display_mode").toInt()));
 420
 421         for (shared_ptr<Signal> signal : signals_) {
 422                 settings.beginGroup(signal->base()->internal_name());
 423                 signal->restore_settings(settings);
 424                 settings.endGroup();
 425         }
 426
 427         if (settings.contains("v_offset")) {
 428                 saved_v_offset_ = settings.value("v_offset").toInt();
 429                 set_v_offset(saved_v_offset_);
 430                 scroll_needs_defaults_ = false;
 431                 // Note: see eventFilter() for additional information
 432         }
 433
 434         settings_restored_ = true;
 435         suppress_zoom_to_fit_after_acq_ = true;
 436
 437         // Update the ruler so that it uses the new scale
 438         calculate_tick_spacing();
 439 }
 440
 441 vector< shared_ptr<TimeItem> > View::time_items() const
 442 {
 443         const vector<shared_ptr<Flag>> f(flags());
 444         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 445
 446         if (cursors_) {
 447                 items.push_back(cursors_);
 448                 items.push_back(cursors_->first());
 449                 items.push_back(cursors_->second());
 450         }
 451
 452         for (auto trigger_marker : trigger_markers_)
 453                 items.push_back(trigger_marker);
 454
 455         return items;
 456 }
 457
 458 double View::scale() const
 459 {
 460         return scale_;
 461 }
 462
 463 void View::set_scale(double scale)
 464 {
 465         if (scale_ != scale) {
 466                 scale_ = scale;
 467                 scale_changed();
 468         }
 469 }
 470
 471 void View::set_offset(const pv::util::Timestamp& offset, bool force_update)
 472 {
 473         if ((offset_ != offset) || force_update) {
 474                 offset_ = offset;
 475                 ruler_offset_ = offset_ + ruler_shift_;
 476                 offset_changed();
 477         }
 478 }
 479
 480 const Timestamp& View::offset() const
 481 {
 482         return offset_;
 483 }
 484
 485 const Timestamp& View::ruler_offset() const
 486 {
 487         return ruler_offset_;
 488 }
 489
 490 void View::set_zero_position(pv::util::Timestamp& position)
 491 {
 492         ruler_shift_ = -position;
 493
 494         // Force an immediate update of the offsets
 495         set_offset(offset_, true);
 496         ruler_->update();
 497 }
 498
 499 void View::reset_zero_position()
 500 {
 501         ruler_shift_ = 0;
 502
 503         // Force an immediate update of the offsets
 504         set_offset(offset_, true);
 505         ruler_->update();
 506 }
 507
 508 int View::owner_visual_v_offset() const
 509 {
 510         return -scrollarea_->verticalScrollBar()->sliderPosition();
 511 }
 512
 513 void View::set_v_offset(int offset)
 514 {
 515         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 516         header_->update();
 517         viewport_->update();
 518 }
 519
 520 unsigned int View::depth() const
 521 {
 522         return 0;
 523 }
 524
 525 uint32_t View::current_segment() const
 526 {
 527         return current_segment_;
 528 }
 529
 530 pv::util::SIPrefix View::tick_prefix() const
 531 {
 532         return tick_prefix_;
 533 }
 534
 535 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 536 {
 537         if (tick_prefix_ != tick_prefix) {
 538                 tick_prefix_ = tick_prefix;
 539                 tick_prefix_changed();
 540         }
 541 }
 542
 543 unsigned int View::tick_precision() const
 544 {
 545         return tick_precision_;
 546 }
 547
 548 void View::set_tick_precision(unsigned tick_precision)
 549 {
 550         if (tick_precision_ != tick_precision) {
 551                 tick_precision_ = tick_precision;
 552                 tick_precision_changed();
 553         }
 554 }
 555
 556 const pv::util::Timestamp& View::tick_period() const
 557 {
 558         return tick_period_;
 559 }
 560
 561 unsigned int View::minor_tick_count() const
 562 {
 563         return minor_tick_count_;
 564 }
 565
 566 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 567 {
 568         if (tick_period_ != tick_period) {
 569                 tick_period_ = tick_period;
 570                 tick_period_changed();
 571         }
 572 }
 573
 574 TimeUnit View::time_unit() const
 575 {
 576         return time_unit_;
 577 }
 578
 579 void View::set_time_unit(pv::util::TimeUnit time_unit)
 580 {
 581         if (time_unit_ != time_unit) {
 582                 time_unit_ = time_unit;
 583                 time_unit_changed();
 584         }
 585 }
 586
 587 void View::set_current_segment(uint32_t segment_id)
 588 {
 589         current_segment_ = segment_id;
 590
 591         for (shared_ptr<Signal> signal : signals_)
 592                 signal->set_current_segment(current_segment_);
 593 #ifdef ENABLE_DECODE
 594         for (shared_ptr<DecodeTrace> dt : decode_traces_)
 595                 dt->set_current_segment(current_segment_);
 596 #endif
 597
 598         vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
 599
 600         trigger_markers_.clear();
 601         for (util::Timestamp timestamp : triggers)
 602                 trigger_markers_.push_back(make_shared<TriggerMarker>(*this, timestamp));
 603
 604         // When enabled, the first trigger for this segment is used as the zero position
 605         GlobalSettings settings;
 606         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 607
 608         if (trigger_is_zero_time && (triggers.size() > 0))
 609                 set_zero_position(triggers.front());
 610
 611         viewport_->update();
 612
 613         segment_changed(segment_id);
 614 }
 615
 616 bool View::segment_is_selectable() const
 617 {
 618         return segment_selectable_;
 619 }
 620
 621 Trace::SegmentDisplayMode View::segment_display_mode() const
 622 {
 623         return segment_display_mode_;
 624 }
 625
 626 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 627 {
 628         segment_display_mode_ = mode;
 629
 630         for (shared_ptr<Signal> signal : signals_)
 631                 signal->set_segment_display_mode(mode);
 632
 633         uint32_t last_segment = session_.get_segment_count() - 1;
 634
 635         switch (mode) {
 636         case Trace::ShowLastSegmentOnly:
 637                 if (current_segment_ != last_segment)
 638                         set_current_segment(last_segment);
 639                 break;
 640
 641         case Trace::ShowLastCompleteSegmentOnly:
 642                 // Do nothing if we only have one segment so far
 643                 if (last_segment > 0) {
 644                         // If the last segment isn't complete, the previous one must be
 645                         uint32_t segment_id =
 646                                 (session_.all_segments_complete(last_segment)) ?
 647                                 last_segment : last_segment - 1;
 648
 649                         if (current_segment_ != segment_id)
 650                                 set_current_segment(segment_id);
 651                 }
 652                 break;
 653
 654         case Trace::ShowSingleSegmentOnly:
 655         case Trace::ShowAllSegments:
 656         case Trace::ShowAccumulatedIntensity:
 657         default:
 658                 // Current segment remains as-is
 659                 break;
 660         }
 661
 662         segment_selectable_ = true;
 663
 664         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 665                 segment_selectable_ = false;
 666
 667         viewport_->update();
 668
 669         segment_display_mode_changed((int)mode, segment_selectable_);
 670 }
 671
 672 void View::zoom(double steps)
 673 {
 674         zoom(steps, viewport_->width() / 2);
 675 }
 676
 677 void View::zoom(double steps, int offset)
 678 {
 679         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 680 }
 681
 682 void View::zoom_fit(bool gui_state)
 683 {
 684         // Act as one-shot when stopped, toggle along with the GUI otherwise
 685         if (session_.get_capture_state() == Session::Stopped) {
 686                 always_zoom_to_fit_ = false;
 687                 always_zoom_to_fit_changed(false);
 688         } else {
 689                 always_zoom_to_fit_ = gui_state;
 690                 always_zoom_to_fit_changed(gui_state);
 691         }
 692
 693         const pair<Timestamp, Timestamp> extents = get_time_extents();
 694         const Timestamp delta = extents.second - extents.first;
 695         if (delta < Timestamp("1e-12"))
 696                 return;
 697
 698         assert(viewport_);
 699         const int w = viewport_->width();
 700         if (w <= 0)
 701                 return;
 702
 703         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 704         set_scale_offset(scale.convert_to<double>(), extents.first);
 705 }
 706
 707 void View::set_scale_offset(double scale, const Timestamp& offset)
 708 {
 709         // Disable sticky scrolling / always zoom to fit when acquisition runs
 710         // and user drags the viewport
 711         if ((scale_ == scale) && (offset_ != offset) &&
 712                         (session_.get_capture_state() == Session::Running)) {
 713
 714                 if (sticky_scrolling_) {
 715                         sticky_scrolling_ = false;
 716                         sticky_scrolling_changed(false);
 717                 }
 718
 719                 if (always_zoom_to_fit_) {
 720                         always_zoom_to_fit_ = false;
 721                         always_zoom_to_fit_changed(false);
 722                 }
 723         }
 724
 725         set_scale(scale);
 726         set_offset(offset);
 727
 728         calculate_tick_spacing();
 729
 730         update_scroll();
 731         ruler_->update();
 732         viewport_->update();
 733 }
 734
 735 set< shared_ptr<SignalData> > View::get_visible_data() const
 736 {
 737         // Make a set of all the visible data objects
 738         set< shared_ptr<SignalData> > visible_data;
 739         for (const shared_ptr<Signal> sig : signals_)
 740                 if (sig->enabled())
 741                         visible_data.insert(sig->data());
 742
 743         return visible_data;
 744 }
 745
 746 pair<Timestamp, Timestamp> View::get_time_extents() const
 747 {
 748         boost::optional<Timestamp> left_time, right_time;
 749         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 750         for (const shared_ptr<SignalData> d : visible_data) {
 751                 const vector< shared_ptr<Segment> > segments = d->segments();
 752                 for (const shared_ptr<Segment> &s : segments) {
 753                         double samplerate = s->samplerate();
 754                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 755
 756                         const Timestamp start_time = s->start_time();
 757                         left_time = left_time ?
 758                                 min(*left_time, start_time) :
 759                                                 start_time;
 760                         right_time = right_time ?
 761                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 762                                                  start_time + d->max_sample_count() / samplerate;
 763                 }
 764         }
 765
 766         if (!left_time || !right_time)
 767                 return make_pair(0, 0);
 768
 769         assert(*left_time < *right_time);
 770         return make_pair(*left_time, *right_time);
 771 }
 772
 773 void View::enable_show_sampling_points(bool state)
 774 {
 775         (void)state;
 776
 777         viewport_->update();
 778 }
 779
 780 void View::enable_show_analog_minor_grid(bool state)
 781 {
 782         (void)state;
 783
 784         viewport_->update();
 785 }
 786
 787 void View::enable_colored_bg(bool state)
 788 {
 789         colored_bg_ = state;
 790         viewport_->update();
 791 }
 792
 793 bool View::colored_bg() const
 794 {
 795         return colored_bg_;
 796 }
 797
 798 bool View::cursors_shown() const
 799 {
 800         return show_cursors_;
 801 }
 802
 803 void View::show_cursors(bool show)
 804 {
 805         show_cursors_ = show;
 806         cursor_state_changed(show);
 807         ruler_->update();
 808         viewport_->update();
 809 }
 810
 811 void View::centre_cursors()
 812 {
 813         if (cursors_) {
 814                 const double time_width = scale_ * viewport_->width();
 815                 cursors_->first()->set_time(offset_ + time_width * 0.4);
 816                 cursors_->second()->set_time(offset_ + time_width * 0.6);
 817
 818                 ruler_->update();
 819                 viewport_->update();
 820         }
 821 }
 822
 823 shared_ptr<CursorPair> View::cursors() const
 824 {
 825         return cursors_;
 826 }
 827
 828 void View::add_flag(const Timestamp& time)
 829 {
 830         flags_.push_back(make_shared<Flag>(*this, time,
 831                 QString("%1").arg(next_flag_text_)));
 832
 833         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 834                 (next_flag_text_ + 1);
 835
 836         time_item_appearance_changed(true, true);
 837 }
 838
 839 void View::remove_flag(shared_ptr<Flag> flag)
 840 {
 841         flags_.remove(flag);
 842         time_item_appearance_changed(true, true);
 843 }
 844
 845 vector< shared_ptr<Flag> > View::flags() const
 846 {
 847         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 848         stable_sort(flags.begin(), flags.end(),
 849                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 850                         return a->time() < b->time();
 851                 });
 852
 853         return flags;
 854 }
 855
 856 const QPoint& View::hover_point() const
 857 {
 858         return hover_point_;
 859 }
 860
 861 int64_t View::get_nearest_level_change(const QPoint &p) const
 862 {
 863         shared_ptr<Signal> signal = signal_under_mouse_cursor_;
 864
 865         if (!signal)
 866                 return -1;
 867
 868         // Calculate sample number from cursor position
 869         const double samples_per_pixel = signal->base()->get_samplerate() * scale();
 870         const int64_t x_offset = offset().convert_to<double>() / scale();
 871         const int64_t sample_num = max(((x_offset + p.x()) * samples_per_pixel), 0.0);
 872
 873         // Query for nearest level changes
 874         vector<data::LogicSegment::EdgePair> edges =
 875                 signal->get_nearest_level_changes(sample_num);
 876
 877         if (edges.size() != 2)
 878                 return -1;
 879
 880         // We received absolute sample numbers, make them relative
 881         const int64_t left_sample_delta = sample_num - edges.front().first;
 882         const int64_t right_sample_delta = edges.back().first - sample_num - 1;
 883
 884         const int64_t left_delta = left_sample_delta / samples_per_pixel;
 885         const int64_t right_delta = right_sample_delta / samples_per_pixel;
 886
 887         int64_t nearest = -1;
 888
 889         // Only use closest left or right edge if they're close to the cursor
 890         if ((left_delta < right_delta) && (left_delta < 15))
 891                 nearest = edges.front().first;
 892         if ((left_delta >= right_delta) && (right_delta < 15))
 893                 nearest = edges.back().first;
 894
 895         return nearest;
 896 }
 897
 898 void View::restack_all_trace_tree_items()
 899 {
 900         // Make a list of owners that is sorted from deepest first
 901         const vector<shared_ptr<TraceTreeItem>> items(
 902                 list_by_type<TraceTreeItem>());
 903         set< TraceTreeItemOwner* > owners;
 904         for (const auto &r : items)
 905                 owners.insert(r->owner());
 906         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 907         sort(sorted_owners.begin(), sorted_owners.end(),
 908                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 909                         return a->depth() > b->depth(); });
 910
 911         // Restack the items recursively
 912         for (auto &o : sorted_owners)
 913                 o->restack_items();
 914
 915         // Animate the items to their destination
 916         for (const auto &i : items)
 917                 i->animate_to_layout_v_offset();
 918 }
 919
 920 int View::header_width() const
 921 {
 922          return header_->extended_size_hint().width();
 923 }
 924
 925 void View::on_setting_changed(const QString &key, const QVariant &value)
 926 {
 927         if (key == GlobalSettings::Key_View_TriggerIsZeroTime)
 928                 on_settingViewTriggerIsZeroTime_changed(value);
 929 }
 930
 931 void View::trigger_event(int segment_id, util::Timestamp location)
 932 {
 933         // TODO This doesn't work if we're showing multiple segments at once
 934         if ((uint32_t)segment_id != current_segment_)
 935                 return;
 936
 937         // Set zero location if the Key_View_TriggerIsZeroTime setting is set and
 938         // if this is the first trigger for this segment.
 939         GlobalSettings settings;
 940         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 941
 942         size_t trigger_count = session_.get_triggers(current_segment_).size();
 943
 944         if (trigger_is_zero_time && trigger_count == 1)
 945                 set_zero_position(location);
 946
 947         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
 948 }
 949
 950 void View::get_scroll_layout(double &length, Timestamp &offset) const
 951 {
 952         const pair<Timestamp, Timestamp> extents = get_time_extents();
 953         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 954         offset = offset_ / scale_;
 955 }
 956
 957 void View::set_zoom(double scale, int offset)
 958 {
 959         // Reset the "always zoom to fit" feature as the user changed the zoom
 960         always_zoom_to_fit_ = false;
 961         always_zoom_to_fit_changed(false);
 962
 963         const Timestamp cursor_offset = offset_ + scale_ * offset;
 964         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 965         const Timestamp new_offset = cursor_offset - new_scale * offset;
 966         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 967 }
 968
 969 void View::calculate_tick_spacing()
 970 {
 971         const double SpacingIncrement = 10.0f;
 972         const double MinValueSpacing = 40.0f;
 973
 974         // Figure out the highest numeric value visible on a label
 975         const QSize areaSize = viewport_->size();
 976         const Timestamp max_time = max(fabs(offset_),
 977                 fabs(offset_ + scale_ * areaSize.width()));
 978
 979         double min_width = SpacingIncrement;
 980         double label_width, tick_period_width;
 981
 982         QFontMetrics m(QApplication::font());
 983
 984         // Copies of the member variables with the same name, used in the calculation
 985         // and written back afterwards, so that we don't emit signals all the time
 986         // during the calculation.
 987         pv::util::Timestamp tick_period = tick_period_;
 988         pv::util::SIPrefix tick_prefix = tick_prefix_;
 989         unsigned tick_precision = tick_precision_;
 990
 991         do {
 992                 const double min_period = scale_ * min_width;
 993
 994                 const int order = (int)floorf(log10f(min_period));
 995                 const pv::util::Timestamp order_decimal =
 996                         pow(pv::util::Timestamp(10), order);
 997
 998                 // Allow for a margin of error so that a scale unit of 1 can be used.
 999                 // Otherwise, for a SU of 1 the tick period will almost always be below
1000                 // the min_period by a small amount - and thus skipped in favor of 2.
1001                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
1002                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
1003                 double tp_with_margin;
1004                 unsigned int unit = 0;
1005
1006                 do {
1007                         tp_with_margin = order_decimal.convert_to<double>() *
1008                                 (ScaleUnits[unit++] + tp_margin);
1009                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
1010
1011                 minor_tick_count_ = (unit == 2) ? 4 : 5;
1012                 tick_period = order_decimal * ScaleUnits[unit - 1];
1013                 tick_prefix = static_cast<pv::util::SIPrefix>(
1014                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
1015
1016                 // Precision is the number of fractional digits required, not
1017                 // taking the prefix into account (and it must never be negative)
1018                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
1019
1020                 tick_period_width = (tick_period / scale_).convert_to<double>();
1021
1022                 const QString label_text = Ruler::format_time_with_distance(
1023                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
1024
1025                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
1026                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
1027                                 MinValueSpacing;
1028
1029                 min_width += SpacingIncrement;
1030         } while (tick_period_width < label_width);
1031
1032         set_tick_period(tick_period);
1033         set_tick_prefix(tick_prefix);
1034         set_tick_precision(tick_precision);
1035 }
1036
1037 void View::adjust_top_margin()
1038 {
1039         assert(viewport_);
1040
1041         const QSize areaSize = viewport_->size();
1042
1043         const pair<int, int> extents = v_extents();
1044         const int top_margin = owner_visual_v_offset() + extents.first;
1045         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
1046
1047         // Do we have empty space at the top while the last trace goes out of screen?
1048         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
1049                 const int trace_height = extents.second - extents.first;
1050
1051                 // Center everything vertically if there is enough space
1052                 if (areaSize.height() >= trace_height)
1053                         set_v_offset(extents.first -
1054                                 ((areaSize.height() - trace_height) / 2));
1055                 else
1056                         // Remove the top margin to make as many traces fit on screen as possible
1057                         set_v_offset(extents.first);
1058         }
1059 }
1060
1061 void View::update_scroll()
1062 {
1063         assert(viewport_);
1064         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
1065         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
1066
1067         const QSize areaSize = viewport_->size();
1068
1069         // Set the horizontal scroll bar
1070         double length = 0;
1071         Timestamp offset;
1072         get_scroll_layout(length, offset);
1073         length = max(length - areaSize.width(), 0.0);
1074
1075         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
1076
1077         hscrollbar->setPageStep(areaSize.width() / 2);
1078         hscrollbar->setSingleStep(major_tick_distance);
1079
1080         updating_scroll_ = true;
1081
1082         if (length < MaxScrollValue) {
1083                 hscrollbar->setRange(0, length);
1084                 hscrollbar->setSliderPosition(offset.convert_to<double>());
1085         } else {
1086                 hscrollbar->setRange(0, MaxScrollValue);
1087                 hscrollbar->setSliderPosition(
1088                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
1089         }
1090
1091         updating_scroll_ = false;
1092
1093         // Set the vertical scrollbar
1094         vscrollbar->setPageStep(areaSize.height());
1095         vscrollbar->setSingleStep(areaSize.height() / 8);
1096
1097         const pair<int, int> extents = v_extents();
1098
1099         // Don't change the scrollbar range if there are no traces
1100         if (extents.first != extents.second)
1101                 vscrollbar->setRange(extents.first - areaSize.height(),
1102                         extents.second);
1103
1104         if (scroll_needs_defaults_) {
1105                 set_scroll_default();
1106                 scroll_needs_defaults_ = false;
1107         }
1108 }
1109
1110 void View::reset_scroll()
1111 {
1112         scrollarea_->verticalScrollBar()->setRange(0, 0);
1113 }
1114
1115 void View::set_scroll_default()
1116 {
1117         assert(viewport_);
1118
1119         const QSize areaSize = viewport_->size();
1120
1121         const pair<int, int> extents = v_extents();
1122         const int trace_height = extents.second - extents.first;
1123
1124         // Do all traces fit in the view?
1125         if (areaSize.height() >= trace_height)
1126                 // Center all traces vertically
1127                 set_v_offset(extents.first -
1128                         ((areaSize.height() - trace_height) / 2));
1129         else
1130                 // Put the first trace at the top, letting the bottom ones overflow
1131                 set_v_offset(extents.first);
1132 }
1133
1134 void View::determine_if_header_was_shrunk()
1135 {
1136         const int header_pane_width = splitter_->sizes().front();
1137
1138         // Allow for a slight margin of error so that we also accept
1139         // slight differences when e.g. a label name change increased
1140         // the overall width
1141         header_was_shrunk_ = (header_pane_width < (header_width() - 10));
1142 }
1143
1144 void View::resize_header_to_fit()
1145 {
1146         // Setting the maximum width of the header widget doesn't work as
1147         // expected because the splitter would allow the user to make the
1148         // pane wider than that, creating empty space as a result.
1149         // To make this work, we stricly enforce the maximum width by
1150         // expanding the header unless the user shrunk it on purpose.
1151         // As we're then setting the width of the header pane, we set the
1152         // splitter to the maximum allowed position.
1153
1154         int splitter_area_width = 0;
1155         for (int w : splitter_->sizes())
1156                 splitter_area_width += w;
1157
1158         // Make sure the header has enough horizontal space to show all labels fully
1159         QList<int> pane_sizes;
1160         pane_sizes.push_back(header_->extended_size_hint().width());
1161         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1162         splitter_->setSizes(pane_sizes);
1163 }
1164
1165 void View::update_layout()
1166 {
1167         update_scroll();
1168 }
1169
1170 TraceTreeItemOwner* View::find_prevalent_trace_group(
1171         const shared_ptr<sigrok::ChannelGroup> &group,
1172         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1173                 &signal_map)
1174 {
1175         assert(group);
1176
1177         unordered_set<TraceTreeItemOwner*> owners;
1178         vector<TraceTreeItemOwner*> owner_list;
1179
1180         // Make a set and a list of all the owners
1181         for (const auto &channel : group->channels()) {
1182                 for (auto entry : signal_map) {
1183                         if (entry.first->channel() == channel) {
1184                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1185                                 owner_list.push_back(o);
1186                                 owners.insert(o);
1187                         }
1188                 }
1189         }
1190
1191         // Iterate through the list of owners, and find the most prevalent
1192         size_t max_prevalence = 0;
1193         TraceTreeItemOwner *prevalent_owner = nullptr;
1194         for (TraceTreeItemOwner *owner : owners) {
1195                 const size_t prevalence = count_if(
1196                         owner_list.begin(), owner_list.end(),
1197                         [&](TraceTreeItemOwner *o) { return o == owner; });
1198                 if (prevalence > max_prevalence) {
1199                         max_prevalence = prevalence;
1200                         prevalent_owner = owner;
1201                 }
1202         }
1203
1204         return prevalent_owner;
1205 }
1206
1207 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1208         const vector< shared_ptr<sigrok::Channel> > &channels,
1209         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1210                 &signal_map,
1211         set< shared_ptr<Trace> > &add_list)
1212 {
1213         vector< shared_ptr<Trace> > filtered_traces;
1214
1215         for (const auto &channel : channels) {
1216                 for (auto entry : signal_map) {
1217                         if (entry.first->channel() == channel) {
1218                                 shared_ptr<Trace> trace = entry.second;
1219                                 const auto list_iter = add_list.find(trace);
1220                                 if (list_iter == add_list.end())
1221                                         continue;
1222
1223                                 filtered_traces.push_back(trace);
1224                                 add_list.erase(list_iter);
1225                         }
1226                 }
1227         }
1228
1229         return filtered_traces;
1230 }
1231
1232 void View::determine_time_unit()
1233 {
1234         // Check whether we know the sample rate and hence can use time as the unit
1235         if (time_unit_ == util::TimeUnit::Samples) {
1236                 // Check all signals but...
1237                 for (const shared_ptr<Signal> signal : signals_) {
1238                         const shared_ptr<SignalData> data = signal->data();
1239
1240                         // ...only check first segment of each
1241                         const vector< shared_ptr<Segment> > segments = data->segments();
1242                         if (!segments.empty())
1243                                 if (segments[0]->samplerate()) {
1244                                         set_time_unit(util::TimeUnit::Time);
1245                                         break;
1246                                 }
1247                 }
1248         }
1249 }
1250
1251 bool View::eventFilter(QObject *object, QEvent *event)
1252 {
1253         const QEvent::Type type = event->type();
1254         if (type == QEvent::MouseMove) {
1255
1256                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1257                 if (object == viewport_)
1258                         hover_point_ = mouse_event->pos();
1259                 else if (object == ruler_)
1260                         hover_point_ = QPoint(mouse_event->x(), 0);
1261                 else if (object == header_)
1262                         hover_point_ = QPoint(0, mouse_event->y());
1263                 else
1264                         hover_point_ = QPoint(-1, -1);
1265
1266                 update_hover_point();
1267
1268         } else if (type == QEvent::Leave) {
1269                 hover_point_ = QPoint(-1, -1);
1270                 update_hover_point();
1271         } else if (type == QEvent::Show) {
1272
1273                 // This is somewhat of a hack, unfortunately. We cannot use
1274                 // set_v_offset() from within restore_settings() as the view
1275                 // at that point is neither visible nor properly sized.
1276                 // This is the least intrusive workaround I could come up
1277                 // with: set the vertical offset (or scroll defaults) when
1278                 // the view is shown, which happens after all widgets were
1279                 // resized to their final sizes.
1280                 update_layout();
1281
1282                 if (settings_restored_)
1283                         determine_if_header_was_shrunk();
1284                 else
1285                         resize_header_to_fit();
1286
1287                 if (scroll_needs_defaults_) {
1288                         set_scroll_default();
1289                         scroll_needs_defaults_ = false;
1290                 }
1291
1292                 if (saved_v_offset_) {
1293                         set_v_offset(saved_v_offset_);
1294                         saved_v_offset_ = 0;
1295                 }
1296         }
1297
1298         return QObject::eventFilter(object, event);
1299 }
1300
1301 void View::contextMenuEvent(QContextMenuEvent *event)
1302 {
1303         QPoint pos = event->pos() - QPoint(0, ruler_->sizeHint().height());
1304
1305         const shared_ptr<ViewItem> r = viewport_->get_mouse_over_item(pos);
1306         if (!r)
1307                 return;
1308
1309         QMenu *menu = r->create_view_context_menu(this, pos);
1310         if (menu)
1311                 menu->exec(event->globalPos());
1312 }
1313
1314 void View::resizeEvent(QResizeEvent* event)
1315 {
1316         // Only adjust the top margin if we shrunk vertically
1317         if (event->size().height() < event->oldSize().height())
1318                 adjust_top_margin();
1319
1320         update_layout();
1321 }
1322
1323 void View::update_hover_point()
1324 {
1325         // Determine signal that the mouse cursor is hovering over
1326         signal_under_mouse_cursor_.reset();
1327         for (shared_ptr<Signal> s : signals_) {
1328                 const pair<int, int> extents = s->v_extents();
1329                 const int top = s->get_visual_y() + extents.first;
1330                 const int btm = s->get_visual_y() + extents.second;
1331                 if ((hover_point_.y() >= top) && (hover_point_.y() <= btm)
1332                         && s->base()->enabled())
1333                         signal_under_mouse_cursor_ = s;
1334         }
1335
1336         // Update all trace tree items
1337         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1338                 list_by_type<TraceTreeItem>());
1339         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1340                 r->hover_point_changed(hover_point_);
1341
1342         // Notify any other listeners
1343         hover_point_changed(hover_point_);
1344 }
1345
1346 void View::row_item_appearance_changed(bool label, bool content)
1347 {
1348         if (label)
1349                 header_->update();
1350         if (content)
1351                 viewport_->update();
1352 }
1353
1354 void View::time_item_appearance_changed(bool label, bool content)
1355 {
1356         if (label) {
1357                 ruler_->update();
1358
1359                 // Make sure the header pane width is updated, too
1360                 update_layout();
1361         }
1362
1363         if (content)
1364                 viewport_->update();
1365 }
1366
1367 void View::extents_changed(bool horz, bool vert)
1368 {
1369         sticky_events_ |=
1370                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1371                 (vert ? TraceTreeItemVExtentsChanged : 0);
1372
1373         lazy_event_handler_.stop();
1374         lazy_event_handler_.start();
1375 }
1376
1377 void View::on_signal_name_changed()
1378 {
1379         if (!header_was_shrunk_)
1380                 resize_header_to_fit();
1381 }
1382
1383 void View::on_splitter_moved()
1384 {
1385         // The header can only shrink when the splitter is moved manually
1386         determine_if_header_was_shrunk();
1387
1388         if (!header_was_shrunk_)
1389                 resize_header_to_fit();
1390 }
1391
1392 void View::h_scroll_value_changed(int value)
1393 {
1394         if (updating_scroll_)
1395                 return;
1396
1397         // Disable sticky scrolling when user moves the horizontal scroll bar
1398         // during a running acquisition
1399         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1400                 sticky_scrolling_ = false;
1401                 sticky_scrolling_changed(false);
1402         }
1403
1404         const int range = scrollarea_->horizontalScrollBar()->maximum();
1405         if (range < MaxScrollValue)
1406                 set_offset(scale_ * value);
1407         else {
1408                 double length = 0;
1409                 Timestamp offset;
1410                 get_scroll_layout(length, offset);
1411                 set_offset(scale_ * length * value / MaxScrollValue);
1412         }
1413
1414         ruler_->update();
1415         viewport_->update();
1416 }
1417
1418 void View::v_scroll_value_changed()
1419 {
1420         header_->update();
1421         viewport_->update();
1422 }
1423
1424 void View::signals_changed()
1425 {
1426         using sigrok::Channel;
1427
1428         vector< shared_ptr<Channel> > channels;
1429         shared_ptr<sigrok::Device> sr_dev;
1430         bool signals_added_or_removed = false;
1431
1432         // Do we need to set the vertical scrollbar to its default position later?
1433         // We do if there are no traces, i.e. the scroll bar has no range set
1434         bool reset_scrollbar =
1435                 (scrollarea_->verticalScrollBar()->minimum() ==
1436                         scrollarea_->verticalScrollBar()->maximum());
1437
1438         if (!session_.device()) {
1439                 reset_scroll();
1440                 signals_.clear();
1441         } else {
1442                 sr_dev = session_.device()->device();
1443                 assert(sr_dev);
1444                 channels = sr_dev->channels();
1445         }
1446
1447         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1448
1449         // Make a list of traces that are being added, and a list of traces
1450         // that are being removed
1451         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1452         const set<shared_ptr<Trace>> prev_traces(
1453                 prev_trace_list.begin(), prev_trace_list.end());
1454
1455         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1456
1457 #ifdef ENABLE_DECODE
1458         traces.insert(decode_traces_.begin(), decode_traces_.end());
1459 #endif
1460
1461         set< shared_ptr<Trace> > add_traces;
1462         set_difference(traces.begin(), traces.end(),
1463                 prev_traces.begin(), prev_traces.end(),
1464                 inserter(add_traces, add_traces.begin()));
1465
1466         set< shared_ptr<Trace> > remove_traces;
1467         set_difference(prev_traces.begin(), prev_traces.end(),
1468                 traces.begin(), traces.end(),
1469                 inserter(remove_traces, remove_traces.begin()));
1470
1471         // Make a look-up table of sigrok Channels to pulseview Signals
1472         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1473                 signal_map;
1474         for (const shared_ptr<Signal> &sig : signals_)
1475                 signal_map[sig->base()] = sig;
1476
1477         // Populate channel groups
1478         if (sr_dev)
1479                 for (auto entry : sr_dev->channel_groups()) {
1480                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1481
1482                         if (group->channels().size() <= 1)
1483                                 continue;
1484
1485                         // Find best trace group to add to
1486                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1487                                 group, signal_map);
1488
1489                         // If there is no trace group, create one
1490                         shared_ptr<TraceGroup> new_trace_group;
1491                         if (!owner) {
1492                                 new_trace_group.reset(new TraceGroup());
1493                                 owner = new_trace_group.get();
1494                         }
1495
1496                         // Extract traces for the trace group, removing them from
1497                         // the add list
1498                         const vector< shared_ptr<Trace> > new_traces_in_group =
1499                                 extract_new_traces_for_channels(group->channels(),
1500                                         signal_map, add_traces);
1501
1502                         // Add the traces to the group
1503                         const pair<int, int> prev_v_extents = owner->v_extents();
1504                         int offset = prev_v_extents.second - prev_v_extents.first;
1505                         for (shared_ptr<Trace> trace : new_traces_in_group) {
1506                                 assert(trace);
1507                                 owner->add_child_item(trace);
1508
1509                                 const pair<int, int> extents = trace->v_extents();
1510                                 if (trace->enabled())
1511                                         offset += -extents.first;
1512                                 trace->force_to_v_offset(offset);
1513                                 if (trace->enabled())
1514                                         offset += extents.second;
1515                         }
1516
1517                         if (new_trace_group) {
1518                                 // Assign proper vertical offsets to each channel in the group
1519                                 new_trace_group->restack_items();
1520
1521                                 // If this is a new group, enqueue it in the new top level
1522                                 // items list
1523                                 if (!new_traces_in_group.empty())
1524                                         new_top_level_items.push_back(new_trace_group);
1525                         }
1526                 }
1527
1528         // Enqueue the remaining logic channels in a group
1529         vector< shared_ptr<Channel> > logic_channels;
1530         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1531                 [](const shared_ptr<Channel>& c) {
1532                         return c->type() == sigrok::ChannelType::LOGIC; });
1533
1534         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1535                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1536
1537         if (non_grouped_logic_signals.size() > 0) {
1538                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1539                         make_shared<TraceGroup>());
1540                 for (shared_ptr<Trace> trace : non_grouped_logic_signals)
1541                         non_grouped_trace_group->add_child_item(trace);
1542
1543                 non_grouped_trace_group->restack_items();
1544                 new_top_level_items.push_back(non_grouped_trace_group);
1545         }
1546
1547         // Enqueue the remaining channels as free ungrouped traces
1548         const vector< shared_ptr<Trace> > new_top_level_signals =
1549                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1550         new_top_level_items.insert(new_top_level_items.end(),
1551                 new_top_level_signals.begin(), new_top_level_signals.end());
1552
1553         // Enqueue any remaining traces i.e. decode traces
1554         new_top_level_items.insert(new_top_level_items.end(),
1555                 add_traces.begin(), add_traces.end());
1556
1557         // Remove any removed traces
1558         for (shared_ptr<Trace> trace : remove_traces) {
1559                 TraceTreeItemOwner *const owner = trace->owner();
1560                 assert(owner);
1561                 owner->remove_child_item(trace);
1562                 signals_added_or_removed = true;
1563         }
1564
1565         // Remove any empty trace groups
1566         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1567                 if (group->child_items().size() == 0) {
1568                         remove_child_item(group);
1569                         group.reset();
1570                 }
1571
1572         // Add and position the pending top levels items
1573         int offset = v_extents().second;
1574         for (auto item : new_top_level_items) {
1575                 add_child_item(item);
1576
1577                 // Position the item after the last item or at the top if there is none
1578                 const pair<int, int> extents = item->v_extents();
1579
1580                 if (item->enabled())
1581                         offset += -extents.first;
1582
1583                 item->force_to_v_offset(offset);
1584
1585                 if (item->enabled())
1586                         offset += extents.second;
1587                 signals_added_or_removed = true;
1588         }
1589
1590
1591         if (signals_added_or_removed && !header_was_shrunk_)
1592                 resize_header_to_fit();
1593
1594         update_layout();
1595
1596         header_->update();
1597         viewport_->update();
1598
1599         if (reset_scrollbar)
1600                 set_scroll_default();
1601 }
1602
1603 void View::capture_state_updated(int state)
1604 {
1605         GlobalSettings settings;
1606
1607         if (state == Session::Running) {
1608                 set_time_unit(util::TimeUnit::Samples);
1609
1610                 trigger_markers_.clear();
1611
1612                 scale_at_acq_start_ = scale_;
1613                 offset_at_acq_start_ = offset_;
1614
1615                 // Activate "always zoom to fit" if the setting is enabled and we're
1616                 // the main view of this session (other trace views may be used for
1617                 // zooming and we don't want to mess them up)
1618                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1619                 if (is_main_view_ && state) {
1620                         always_zoom_to_fit_ = true;
1621                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1622                 }
1623
1624                 // Enable sticky scrolling if the setting is enabled
1625                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1626
1627                 // Reset all traces to segment 0
1628                 current_segment_ = 0;
1629                 set_current_segment(current_segment_);
1630         }
1631
1632         if (state == Session::Stopped) {
1633                 // After acquisition has stopped we need to re-calculate the ticks once
1634                 // as it's otherwise done when the user pans or zooms, which is too late
1635                 calculate_tick_spacing();
1636
1637                 // Reset "always zoom to fit", the acquisition has stopped
1638                 if (always_zoom_to_fit_) {
1639                         // Perform a final zoom-to-fit before disabling
1640                         zoom_fit(always_zoom_to_fit_);
1641                         always_zoom_to_fit_ = false;
1642                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1643                 }
1644
1645                 bool zoom_to_fit_after_acq =
1646                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1647
1648                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1649                 // we didn't restore settings in the meanwhile
1650                 if (zoom_to_fit_after_acq &&
1651                         !suppress_zoom_to_fit_after_acq_ &&
1652                         (scale_ == scale_at_acq_start_) &&
1653                         (offset_ == offset_at_acq_start_))
1654                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1655
1656                 suppress_zoom_to_fit_after_acq_ = false;
1657         }
1658 }
1659
1660 void View::on_new_segment(int new_segment_id)
1661 {
1662         on_segment_changed(new_segment_id);
1663 }
1664
1665 void View::on_segment_completed(int segment_id)
1666 {
1667         on_segment_changed(segment_id);
1668 }
1669
1670 void View::on_segment_changed(int segment)
1671 {
1672         switch (segment_display_mode_) {
1673         case Trace::ShowLastSegmentOnly:
1674         case Trace::ShowSingleSegmentOnly:
1675                 set_current_segment(segment);
1676                 break;
1677
1678         case Trace::ShowLastCompleteSegmentOnly:
1679                 // Only update if all segments are complete
1680                 if (session_.all_segments_complete(segment))
1681                         set_current_segment(segment);
1682                 break;
1683
1684         case Trace::ShowAllSegments:
1685         case Trace::ShowAccumulatedIntensity:
1686         default:
1687                 break;
1688         }
1689 }
1690
1691 void View::on_settingViewTriggerIsZeroTime_changed(const QVariant new_value)
1692 {
1693         if (new_value.toBool()) {
1694                 // The first trigger for this segment is used as the zero position
1695                 vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
1696                 if (triggers.size() > 0)
1697                         set_zero_position(triggers.front());
1698         } else
1699                 reset_zero_position();
1700 }
1701
1702 void View::perform_delayed_view_update()
1703 {
1704         if (always_zoom_to_fit_) {
1705                 zoom_fit(true);
1706         } else if (sticky_scrolling_) {
1707                 // Make right side of the view sticky
1708                 double length = 0;
1709                 Timestamp offset;
1710                 get_scroll_layout(length, offset);
1711
1712                 const QSize areaSize = viewport_->size();
1713                 length = max(length - areaSize.width(), 0.0);
1714
1715                 set_offset(scale_ * length);
1716         }
1717
1718         determine_time_unit();
1719         update_scroll();
1720         ruler_->update();
1721         viewport_->update();
1722 }
1723
1724 void View::process_sticky_events()
1725 {
1726         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1727                 update_layout();
1728         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1729                 restack_all_trace_tree_items();
1730                 update_scroll();
1731         }
1732
1733         // Clear the sticky events
1734         sticky_events_ = 0;
1735 }
1736
1737 } // namespace trace
1738 } // namespace views
1739 } // namespace pv