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 <QApplication>
  35 #include <QDebug>
  36 #include <QEvent>
  37 #include <QFontMetrics>
  38 #include <QMenu>
  39 #include <QMouseEvent>
  40 #include <QScrollBar>
  41 #include <QVBoxLayout>
  42
  43 #include <libsigrokcxx/libsigrokcxx.hpp>
  44
  45 #include "analogsignal.hpp"
  46 #include "header.hpp"
  47 #include "logicsignal.hpp"
  48 #include "ruler.hpp"
  49 #include "signal.hpp"
  50 #include "tracegroup.hpp"
  51 #include "triggermarker.hpp"
  52 #include "view.hpp"
  53 #include "viewport.hpp"
  54
  55 #include "pv/data/logic.hpp"
  56 #include "pv/data/logicsegment.hpp"
  57 #include "pv/devices/device.hpp"
  58 #include "pv/globalsettings.hpp"
  59 #include "pv/session.hpp"
  60 #include "pv/util.hpp"
  61
  62 #ifdef ENABLE_DECODE
  63 #include "decodetrace.hpp"
  64 #endif
  65
  66 using pv::data::SignalData;
  67 using pv::data::Segment;
  68 using pv::util::TimeUnit;
  69 using pv::util::Timestamp;
  70
  71 using std::back_inserter;
  72 using std::copy_if;
  73 using std::count_if;
  74 using std::inserter;
  75 using std::max;
  76 using std::make_pair;
  77 using std::make_shared;
  78 using std::min;
  79 using std::numeric_limits;
  80 using std::pair;
  81 using std::set;
  82 using std::set_difference;
  83 using std::shared_ptr;
  84 using std::unordered_map;
  85 using std::unordered_set;
  86 using std::vector;
  87
  88 namespace pv {
  89 namespace views {
  90 namespace trace {
  91
  92 const Timestamp View::MaxScale("1e9");
  93 const Timestamp View::MinScale("1e-12");
  94
  95 const int View::MaxScrollValue = INT_MAX / 2;
  96
  97 const int View::ScaleUnits[3] = {1, 2, 5};
  98
  99
 100 CustomScrollArea::CustomScrollArea(QWidget *parent) :
 101         QAbstractScrollArea(parent)
 102 {
 103 }
 104
 105 bool CustomScrollArea::viewportEvent(QEvent *event)
 106 {
 107         switch (event->type()) {
 108         case QEvent::Paint:
 109         case QEvent::MouseButtonPress:
 110         case QEvent::MouseButtonRelease:
 111         case QEvent::MouseButtonDblClick:
 112         case QEvent::MouseMove:
 113         case QEvent::Wheel:
 114         case QEvent::TouchBegin:
 115         case QEvent::TouchUpdate:
 116         case QEvent::TouchEnd:
 117                 return false;
 118         default:
 119                 return QAbstractScrollArea::viewportEvent(event);
 120         }
 121 }
 122
 123 View::View(Session &session, bool is_main_view, QMainWindow *parent) :
 124         ViewBase(session, is_main_view, parent),
 125
 126         // Note: Place defaults in View::reset_view_state(), not here
 127         splitter_(new QSplitter()),
 128         header_was_shrunk_(false),  // The splitter remains unchanged after a reset, so this goes here
 129         sticky_scrolling_(false),  // Default setting is set in MainWindow::setup_ui()
 130         scroll_needs_defaults_(true)
 131 {
 132         QVBoxLayout *root_layout = new QVBoxLayout(this);
 133         root_layout->setContentsMargins(0, 0, 0, 0);
 134         root_layout->addWidget(splitter_);
 135
 136         viewport_ = new Viewport(*this);
 137         scrollarea_ = new CustomScrollArea(splitter_);
 138         scrollarea_->setViewport(viewport_);
 139         scrollarea_->setFrameShape(QFrame::NoFrame);
 140
 141         ruler_ = new Ruler(*this);
 142
 143         header_ = new Header(*this);
 144         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 145
 146         // We put the header into a simple layout so that we can add the top margin,
 147         // allowing us to make it line up with the bottom of the ruler
 148         QWidget *header_container = new QWidget();
 149         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 150         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 151         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 152         header_layout->addWidget(header_);
 153
 154         // To let the ruler and scrollarea be on the same split pane, we need a layout
 155         QWidget *trace_container = new QWidget();
 156         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 157         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 158         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 159         trace_layout->setContentsMargins(0, 0, 0, 0);
 160         trace_layout->addWidget(ruler_);
 161         trace_layout->addWidget(scrollarea_);
 162
 163         splitter_->addWidget(header_container);
 164         splitter_->addWidget(trace_container);
 165         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 166         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 167         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 168         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 169         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 170         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 171
 172         viewport_->installEventFilter(this);
 173         ruler_->installEventFilter(this);
 174         header_->installEventFilter(this);
 175
 176         // Set up settings and event handlers
 177         GlobalSettings settings;
 178         colored_bg_ = settings.value(GlobalSettings::Key_View_ColoredBG).toBool();
 179         snap_distance_ = settings.value(GlobalSettings::Key_View_SnapDistance).toInt();
 180
 181         GlobalSettings::add_change_handler(this);
 182
 183         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 184                 this, SLOT(h_scroll_value_changed(int)));
 185         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 186                 this, SLOT(v_scroll_value_changed()));
 187
 188         connect(header_, SIGNAL(selection_changed()),
 189                 ruler_, SLOT(clear_selection()));
 190         connect(ruler_, SIGNAL(selection_changed()),
 191                 header_, SLOT(clear_selection()));
 192
 193         connect(header_, SIGNAL(selection_changed()),
 194                 this, SIGNAL(selection_changed()));
 195         connect(ruler_, SIGNAL(selection_changed()),
 196                 this, SIGNAL(selection_changed()));
 197
 198         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 199                 this, SLOT(on_splitter_moved()));
 200
 201         connect(&lazy_event_handler_, SIGNAL(timeout()),
 202                 this, SLOT(process_sticky_events()));
 203         lazy_event_handler_.setSingleShot(true);
 204
 205         // Set up local keyboard shortcuts
 206         zoom_in_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Plus), this,
 207                 SLOT(on_zoom_in_shortcut_triggered()), nullptr, Qt::WidgetWithChildrenShortcut);
 208         zoom_in_shortcut_->setAutoRepeat(false);
 209
 210         zoom_out_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Minus), this,
 211                 SLOT(on_zoom_out_shortcut_triggered()), nullptr, Qt::WidgetWithChildrenShortcut);
 212         zoom_out_shortcut_->setAutoRepeat(false);
 213
 214         zoom_in_shortcut_2_ = new QShortcut(QKeySequence(Qt::Key_Up), this,
 215                 SLOT(on_zoom_in_shortcut_triggered()), nullptr, Qt::WidgetWithChildrenShortcut);
 216         zoom_out_shortcut_2_ = new QShortcut(QKeySequence(Qt::Key_Down), this,
 217                 SLOT(on_zoom_out_shortcut_triggered()), nullptr, Qt::WidgetWithChildrenShortcut);
 218
 219         home_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Home), this,
 220                 SLOT(on_scroll_to_start_shortcut_triggered()), nullptr, Qt::WidgetWithChildrenShortcut);
 221         home_shortcut_->setAutoRepeat(false);
 222
 223         end_shortcut_ = new QShortcut(QKeySequence(Qt::Key_End), this,
 224                 SLOT(on_scroll_to_end_shortcut_triggered()), nullptr, Qt::WidgetWithChildrenShortcut);
 225         end_shortcut_->setAutoRepeat(false);
 226
 227         grab_ruler_left_shortcut_ = new QShortcut(QKeySequence(Qt::Key_1), this,
 228                 nullptr, nullptr, Qt::WidgetWithChildrenShortcut);
 229         connect(grab_ruler_left_shortcut_, &QShortcut::activated,
 230                 this, [=]{on_grab_ruler(1);});
 231         grab_ruler_left_shortcut_->setAutoRepeat(false);
 232
 233         grab_ruler_right_shortcut_ = new QShortcut(QKeySequence(Qt::Key_2), this,
 234                 nullptr, nullptr, Qt::WidgetWithChildrenShortcut);
 235         connect(grab_ruler_right_shortcut_, &QShortcut::activated,
 236                 this, [=]{on_grab_ruler(2);});
 237         grab_ruler_right_shortcut_->setAutoRepeat(false);
 238
 239         cancel_grab_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Escape), this,
 240                 nullptr, nullptr, Qt::WidgetWithChildrenShortcut);
 241         connect(cancel_grab_shortcut_, &QShortcut::activated,
 242                 this, [=]{grabbed_widget_ = nullptr;});
 243         cancel_grab_shortcut_->setAutoRepeat(false);
 244
 245         // Trigger the initial event manually. The default device has signals
 246         // which were created before this object came into being
 247         signals_changed();
 248
 249         // Make sure the transparent widgets are on the top
 250         ruler_->raise();
 251         header_->raise();
 252
 253         reset_view_state();
 254 }
 255
 256 View::~View()
 257 {
 258         GlobalSettings::remove_change_handler(this);
 259 }
 260
 261 ViewType View::get_type() const
 262 {
 263         return ViewTypeTrace;
 264 }
 265
 266 void View::reset_view_state()
 267 {
 268         ViewBase::reset_view_state();
 269
 270         segment_display_mode_ = Trace::ShowLastSegmentOnly;
 271         segment_selectable_ = false;
 272         scale_ = 1e-3;
 273         offset_ = 0;
 274         ruler_offset_ = 0;
 275         zero_offset_ = 0;
 276         custom_zero_offset_set_ = false;
 277         updating_scroll_ = false;
 278         settings_restored_ = false;
 279         always_zoom_to_fit_ = false;
 280         tick_period_ = 0;
 281         tick_prefix_ = pv::util::SIPrefix::yocto;
 282         tick_precision_ = 0;
 283         time_unit_ = util::TimeUnit::Time;
 284         show_cursors_ = false;
 285         cursors_ = make_shared<CursorPair>(*this);
 286         next_flag_text_ = 'A';
 287         trigger_markers_.clear();
 288         hover_widget_ = nullptr;
 289         grabbed_widget_ = nullptr;
 290         hover_point_ = QPoint(-1, -1);
 291         scroll_needs_defaults_ = true;
 292         saved_v_offset_ = 0;
 293         scale_at_acq_start_ = 0;
 294         offset_at_acq_start_ = 0;
 295         suppress_zoom_to_fit_after_acq_ = false;
 296
 297         show_cursors_ = false;
 298         cursor_state_changed(show_cursors_);
 299         flags_.clear();
 300
 301         // Update the zoom state
 302         calculate_tick_spacing();
 303
 304         // Make sure the standard bar's segment selector is in sync
 305         set_segment_display_mode(segment_display_mode_);
 306 }
 307
 308 Session& View::session()
 309 {
 310         return session_;
 311 }
 312
 313 const Session& View::session() const
 314 {
 315         return session_;
 316 }
 317
 318 unordered_set< shared_ptr<Signal> > View::signals() const
 319 {
 320         return signals_;
 321 }
 322
 323 shared_ptr<Signal> View::get_signal_by_signalbase(shared_ptr<data::SignalBase> base) const
 324 {
 325         shared_ptr<Signal> ret_val;
 326
 327         for (const shared_ptr<Signal>& s : signals_)
 328                 if (s->base() == base) {
 329                         ret_val = s;
 330                         break;
 331                 }
 332
 333         return ret_val;
 334 }
 335
 336 void View::clear_signals()
 337 {
 338         ViewBase::clear_signals();
 339         signals_.clear();
 340 }
 341
 342 void View::add_signal(const shared_ptr<Signal> signal)
 343 {
 344         ViewBase::add_signalbase(signal->base());
 345         signals_.insert(signal);
 346
 347         signal->set_segment_display_mode(segment_display_mode_);
 348         signal->set_current_segment(current_segment_);
 349
 350         connect(signal->base().get(), SIGNAL(name_changed(const QString&)),
 351                 this, SLOT(on_signal_name_changed()));
 352 }
 353
 354 #ifdef ENABLE_DECODE
 355 void View::clear_decode_signals()
 356 {
 357         ViewBase::clear_decode_signals();
 358         decode_traces_.clear();
 359 }
 360
 361 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 362 {
 363         ViewBase::add_decode_signal(signal);
 364
 365         shared_ptr<DecodeTrace> d(
 366                 new DecodeTrace(session_, signal, decode_traces_.size()));
 367         decode_traces_.push_back(d);
 368
 369         d->set_segment_display_mode(segment_display_mode_);
 370         d->set_current_segment(current_segment_);
 371
 372         connect(signal.get(), SIGNAL(name_changed(const QString&)),
 373                 this, SLOT(on_signal_name_changed()));
 374 }
 375
 376 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 377 {
 378         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 379                 if ((*i)->base() == signal) {
 380                         decode_traces_.erase(i);
 381                         signals_changed();
 382                         return;
 383                 }
 384
 385         ViewBase::remove_decode_signal(signal);
 386 }
 387 #endif
 388
 389 shared_ptr<Signal> View::get_signal_under_mouse_cursor() const
 390 {
 391         return signal_under_mouse_cursor_;
 392 }
 393
 394 View* View::view()
 395 {
 396         return this;
 397 }
 398
 399 const View* View::view() const
 400 {
 401         return this;
 402 }
 403
 404 Viewport* View::viewport()
 405 {
 406         return viewport_;
 407 }
 408
 409 const Viewport* View::viewport() const
 410 {
 411         return viewport_;
 412 }
 413
 414 QAbstractScrollArea* View::scrollarea() const
 415 {
 416         return scrollarea_;
 417 }
 418
 419 const Ruler* View::ruler() const
 420 {
 421         return ruler_;
 422 }
 423
 424 void View::save_settings(QSettings &settings) const
 425 {
 426         settings.setValue("scale", scale_);
 427         settings.setValue("v_offset",
 428                 scrollarea_->verticalScrollBar()->sliderPosition());
 429
 430         settings.setValue("splitter_state", splitter_->saveState());
 431         settings.setValue("segment_display_mode", segment_display_mode_);
 432
 433         GlobalSettings::store_timestamp(settings, "offset", offset_);
 434
 435         if (custom_zero_offset_set_)
 436                 GlobalSettings::store_timestamp(settings, "zero_offset", -zero_offset_);
 437         else
 438                 settings.remove("zero_offset");
 439
 440         for (const shared_ptr<Signal>& signal : signals_) {
 441                 settings.beginGroup(signal->base()->internal_name());
 442                 signal->save_settings(settings);
 443                 settings.endGroup();
 444         }
 445 }
 446
 447 void View::restore_settings(QSettings &settings)
 448 {
 449         // Note: It is assumed that this function is only called once,
 450         // immediately after restoring a previous session.
 451
 452         if (settings.contains("scale"))
 453                 set_scale(settings.value("scale").toDouble());
 454
 455         if (settings.contains("offset")) {
 456                 // This also updates ruler_offset_
 457                 set_offset(GlobalSettings::restore_timestamp(settings, "offset"));
 458         }
 459
 460         if (settings.contains("zero_offset"))
 461                 set_zero_position(GlobalSettings::restore_timestamp(settings, "zero_offset"));
 462
 463         if (settings.contains("splitter_state"))
 464                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 465
 466         if (settings.contains("segment_display_mode"))
 467                 set_segment_display_mode(
 468                         (Trace::SegmentDisplayMode)(settings.value("segment_display_mode").toInt()));
 469
 470         for (shared_ptr<Signal> signal : signals_) {
 471                 settings.beginGroup(signal->base()->internal_name());
 472                 signal->restore_settings(settings);
 473                 settings.endGroup();
 474         }
 475
 476         if (settings.contains("v_offset")) {
 477                 saved_v_offset_ = settings.value("v_offset").toInt();
 478                 set_v_offset(saved_v_offset_);
 479                 scroll_needs_defaults_ = false;
 480                 // Note: see eventFilter() for additional information
 481         }
 482
 483         settings_restored_ = true;
 484         suppress_zoom_to_fit_after_acq_ = true;
 485
 486         // Update the ruler so that it uses the new scale
 487         calculate_tick_spacing();
 488 }
 489
 490 vector< shared_ptr<TimeItem> > View::time_items() const
 491 {
 492         const vector<shared_ptr<Flag>> f(flags());
 493         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 494
 495         if (cursors_) {
 496                 items.push_back(cursors_);
 497                 items.push_back(cursors_->first());
 498                 items.push_back(cursors_->second());
 499         }
 500
 501         for (auto& trigger_marker : trigger_markers_)
 502                 items.push_back(trigger_marker);
 503
 504         return items;
 505 }
 506
 507 double View::scale() const
 508 {
 509         return scale_;
 510 }
 511
 512 void View::set_scale(double scale)
 513 {
 514         if (scale_ != scale) {
 515                 scale_ = scale;
 516                 scale_changed();
 517         }
 518 }
 519
 520 void View::set_offset(const pv::util::Timestamp& offset, bool force_update)
 521 {
 522         if ((offset_ != offset) || force_update) {
 523                 offset_ = offset;
 524                 ruler_offset_ = offset_ + zero_offset_;
 525                 offset_changed();
 526         }
 527 }
 528
 529 const Timestamp& View::offset() const
 530 {
 531         return offset_;
 532 }
 533
 534 const Timestamp& View::ruler_offset() const
 535 {
 536         return ruler_offset_;
 537 }
 538
 539 void View::set_zero_position(const pv::util::Timestamp& position)
 540 {
 541         zero_offset_ = -position;
 542         custom_zero_offset_set_ = true;
 543
 544         // Force an immediate update of the offsets
 545         set_offset(offset_, true);
 546         ruler_->update();
 547 }
 548
 549 void View::reset_zero_position()
 550 {
 551         zero_offset_ = 0;
 552
 553         // When enabled, the first trigger for this segment is used as the zero position
 554         GlobalSettings settings;
 555         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 556
 557         if (trigger_is_zero_time) {
 558                 vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
 559
 560                 if (triggers.size() > 0)
 561                         zero_offset_ = triggers.front();
 562         }
 563
 564         custom_zero_offset_set_ = false;
 565
 566         // Force an immediate update of the offsets
 567         set_offset(offset_, true);
 568         ruler_->update();
 569 }
 570
 571 pv::util::Timestamp View::zero_offset() const
 572 {
 573         return zero_offset_;
 574 }
 575
 576 int View::owner_visual_v_offset() const
 577 {
 578         return -scrollarea_->verticalScrollBar()->sliderPosition();
 579 }
 580
 581 void View::set_v_offset(int offset)
 582 {
 583         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 584         header_->update();
 585         viewport_->update();
 586 }
 587
 588 void View::set_h_offset(int offset)
 589 {
 590         scrollarea_->horizontalScrollBar()->setSliderPosition(offset);
 591         header_->update();
 592         viewport_->update();
 593 }
 594
 595 int View::get_h_scrollbar_maximum() const
 596 {
 597         return scrollarea_->horizontalScrollBar()->maximum();
 598 }
 599
 600 unsigned int View::depth() const
 601 {
 602         return 0;
 603 }
 604
 605 uint32_t View::current_segment() const
 606 {
 607         return current_segment_;
 608 }
 609
 610 pv::util::SIPrefix View::tick_prefix() const
 611 {
 612         return tick_prefix_;
 613 }
 614
 615 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 616 {
 617         if (tick_prefix_ != tick_prefix) {
 618                 tick_prefix_ = tick_prefix;
 619                 tick_prefix_changed();
 620         }
 621 }
 622
 623 unsigned int View::tick_precision() const
 624 {
 625         return tick_precision_;
 626 }
 627
 628 void View::set_tick_precision(unsigned tick_precision)
 629 {
 630         if (tick_precision_ != tick_precision) {
 631                 tick_precision_ = tick_precision;
 632                 tick_precision_changed();
 633         }
 634 }
 635
 636 const pv::util::Timestamp& View::tick_period() const
 637 {
 638         return tick_period_;
 639 }
 640
 641 unsigned int View::minor_tick_count() const
 642 {
 643         return minor_tick_count_;
 644 }
 645
 646 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 647 {
 648         if (tick_period_ != tick_period) {
 649                 tick_period_ = tick_period;
 650                 tick_period_changed();
 651         }
 652 }
 653
 654 TimeUnit View::time_unit() const
 655 {
 656         return time_unit_;
 657 }
 658
 659 void View::set_time_unit(pv::util::TimeUnit time_unit)
 660 {
 661         if (time_unit_ != time_unit) {
 662                 time_unit_ = time_unit;
 663                 time_unit_changed();
 664         }
 665 }
 666
 667 void View::set_current_segment(uint32_t segment_id)
 668 {
 669         current_segment_ = segment_id;
 670
 671         for (const shared_ptr<Signal>& signal : signals_)
 672                 signal->set_current_segment(current_segment_);
 673 #ifdef ENABLE_DECODE
 674         for (shared_ptr<DecodeTrace>& dt : decode_traces_)
 675                 dt->set_current_segment(current_segment_);
 676 #endif
 677
 678         vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
 679
 680         trigger_markers_.clear();
 681         for (util::Timestamp timestamp : triggers)
 682                 trigger_markers_.push_back(make_shared<TriggerMarker>(*this, timestamp));
 683
 684         if (!custom_zero_offset_set_)
 685                 reset_zero_position();
 686
 687         viewport_->update();
 688
 689         segment_changed(segment_id);
 690 }
 691
 692 bool View::segment_is_selectable() const
 693 {
 694         return segment_selectable_;
 695 }
 696
 697 Trace::SegmentDisplayMode View::segment_display_mode() const
 698 {
 699         return segment_display_mode_;
 700 }
 701
 702 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 703 {
 704         segment_display_mode_ = mode;
 705
 706         for (const shared_ptr<Signal>& signal : signals_)
 707                 signal->set_segment_display_mode(mode);
 708
 709         uint32_t last_segment = session_.get_segment_count() - 1;
 710
 711         switch (mode) {
 712         case Trace::ShowLastSegmentOnly:
 713                 if (current_segment_ != last_segment)
 714                         set_current_segment(last_segment);
 715                 break;
 716
 717         case Trace::ShowLastCompleteSegmentOnly:
 718                 // Do nothing if we only have one segment so far
 719                 if (last_segment > 0) {
 720                         // If the last segment isn't complete, the previous one must be
 721                         uint32_t segment_id =
 722                                 (session_.all_segments_complete(last_segment)) ?
 723                                 last_segment : last_segment - 1;
 724
 725                         if (current_segment_ != segment_id)
 726                                 set_current_segment(segment_id);
 727                 }
 728                 break;
 729
 730         case Trace::ShowSingleSegmentOnly:
 731         case Trace::ShowAllSegments:
 732         case Trace::ShowAccumulatedIntensity:
 733         default:
 734                 // Current segment remains as-is
 735                 break;
 736         }
 737
 738         segment_selectable_ = true;
 739
 740         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 741                 segment_selectable_ = false;
 742
 743         viewport_->update();
 744
 745         segment_display_mode_changed((int)mode, segment_selectable_);
 746 }
 747
 748 void View::zoom(double steps)
 749 {
 750         zoom(steps, viewport_->width() / 2);
 751 }
 752
 753 void View::zoom(double steps, int offset)
 754 {
 755         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 756 }
 757
 758 void View::zoom_fit(bool gui_state)
 759 {
 760         // Act as one-shot when stopped, toggle along with the GUI otherwise
 761         if (session_.get_capture_state() == Session::Stopped) {
 762                 always_zoom_to_fit_ = false;
 763                 always_zoom_to_fit_changed(false);
 764         } else {
 765                 always_zoom_to_fit_ = gui_state;
 766                 always_zoom_to_fit_changed(gui_state);
 767         }
 768
 769         const pair<Timestamp, Timestamp> extents = get_time_extents();
 770         const Timestamp delta = extents.second - extents.first;
 771         if (delta < Timestamp("1e-12"))
 772                 return;
 773
 774         assert(viewport_);
 775         const int w = viewport_->width();
 776         if (w <= 0)
 777                 return;
 778
 779         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 780         set_scale_offset(scale.convert_to<double>(), extents.first);
 781 }
 782
 783 void View::set_scale_offset(double scale, const Timestamp& offset)
 784 {
 785         // Disable sticky scrolling / always zoom to fit when acquisition runs
 786         // and user drags the viewport
 787         if ((scale_ == scale) && (offset_ != offset) &&
 788                         (session_.get_capture_state() == Session::Running)) {
 789
 790                 if (sticky_scrolling_) {
 791                         sticky_scrolling_ = false;
 792                         sticky_scrolling_changed(false);
 793                 }
 794
 795                 if (always_zoom_to_fit_) {
 796                         always_zoom_to_fit_ = false;
 797                         always_zoom_to_fit_changed(false);
 798                 }
 799         }
 800
 801         set_scale(scale);
 802         set_offset(offset);
 803
 804         calculate_tick_spacing();
 805
 806         update_scroll();
 807         ruler_->update();
 808         viewport_->update();
 809 }
 810
 811 set< shared_ptr<SignalData> > View::get_visible_data() const
 812 {
 813         // Make a set of all the visible data objects
 814         set< shared_ptr<SignalData> > visible_data;
 815         for (const shared_ptr<Signal>& sig : signals_)
 816                 if (sig->enabled())
 817                         visible_data.insert(sig->data());
 818
 819         return visible_data;
 820 }
 821
 822 pair<Timestamp, Timestamp> View::get_time_extents() const
 823 {
 824         boost::optional<Timestamp> left_time, right_time;
 825         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 826         for (const shared_ptr<SignalData>& d : visible_data) {
 827                 const vector< shared_ptr<Segment> > segments = d->segments();
 828                 for (const shared_ptr<Segment>& s : segments) {
 829                         double samplerate = s->samplerate();
 830                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 831
 832                         const Timestamp start_time = s->start_time();
 833                         left_time = left_time ?
 834                                 min(*left_time, start_time) :
 835                                                 start_time;
 836                         right_time = right_time ?
 837                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 838                                                  start_time + d->max_sample_count() / samplerate;
 839                 }
 840         }
 841
 842         if (!left_time || !right_time)
 843                 return make_pair(0, 0);
 844
 845         assert(*left_time < *right_time);
 846         return make_pair(*left_time, *right_time);
 847 }
 848
 849 bool View::colored_bg() const
 850 {
 851         return colored_bg_;
 852 }
 853
 854 bool View::cursors_shown() const
 855 {
 856         return show_cursors_;
 857 }
 858
 859 void View::show_cursors(bool show)
 860 {
 861         if (show_cursors_ != show) {
 862                 show_cursors_ = show;
 863
 864                 cursor_state_changed(show);
 865                 ruler_->update();
 866                 viewport_->update();
 867         }
 868 }
 869
 870 void View::set_cursors(pv::util::Timestamp& first, pv::util::Timestamp& second)
 871 {
 872         assert(cursors_);
 873
 874         cursors_->first()->set_time(first);
 875         cursors_->second()->set_time(second);
 876
 877         ruler_->update();
 878         viewport_->update();
 879 }
 880
 881 void View::center_cursors()
 882 {
 883         assert(cursors_);
 884
 885         const double time_width = scale_ * viewport_->width();
 886         cursors_->first()->set_time(offset_ + time_width * 0.4);
 887         cursors_->second()->set_time(offset_ + time_width * 0.6);
 888
 889         ruler_->update();
 890         viewport_->update();
 891 }
 892
 893 shared_ptr<CursorPair> View::cursors() const
 894 {
 895         return cursors_;
 896 }
 897
 898 shared_ptr<Flag> View::add_flag(const Timestamp& time)
 899 {
 900         shared_ptr<Flag> flag =
 901                 make_shared<Flag>(*this, time, QString("%1").arg(next_flag_text_));
 902         flags_.push_back(flag);
 903
 904         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 905                 (next_flag_text_ + 1);
 906
 907         time_item_appearance_changed(true, true);
 908         return flag;
 909 }
 910
 911 void View::remove_flag(shared_ptr<Flag> flag)
 912 {
 913         flags_.remove(flag);
 914         time_item_appearance_changed(true, true);
 915 }
 916
 917 vector< shared_ptr<Flag> > View::flags() const
 918 {
 919         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 920         stable_sort(flags.begin(), flags.end(),
 921                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 922                         return a->time() < b->time();
 923                 });
 924
 925         return flags;
 926 }
 927
 928 const QPoint& View::hover_point() const
 929 {
 930         return hover_point_;
 931 }
 932
 933 const QWidget* View::hover_widget() const
 934 {
 935         return hover_widget_;
 936 }
 937
 938 int64_t View::get_nearest_level_change(const QPoint &p)
 939 {
 940         // Is snapping disabled?
 941         if (snap_distance_ == 0)
 942                 return -1;
 943
 944         struct entry_t {
 945                 entry_t(shared_ptr<Signal> s) :
 946                         signal(s), delta(numeric_limits<int64_t>::max()), sample(-1), is_dense(false) {}
 947                 shared_ptr<Signal> signal;
 948                 int64_t delta;
 949                 int64_t sample;
 950                 bool is_dense;
 951         };
 952
 953         vector<entry_t> list;
 954
 955         // Create list of signals to consider
 956         if (signal_under_mouse_cursor_)
 957                 list.emplace_back(signal_under_mouse_cursor_);
 958         else
 959                 for (shared_ptr<Signal> s : signals_) {
 960                         if (!s->enabled())
 961                                 continue;
 962
 963                         list.emplace_back(s);
 964                 }
 965
 966         // Get data for listed signals
 967         for (entry_t &e : list) {
 968                 // Calculate sample number from cursor position
 969                 const double samples_per_pixel = e.signal->base()->get_samplerate() * scale();
 970                 const int64_t x_offset = offset().convert_to<double>() / scale();
 971                 const int64_t sample_num = max(((x_offset + p.x()) * samples_per_pixel), 0.0);
 972
 973                 vector<data::LogicSegment::EdgePair> edges =
 974                         e.signal->get_nearest_level_changes(sample_num);
 975
 976                 if (edges.empty())
 977                         continue;
 978
 979                 // Check first edge
 980                 const int64_t first_sample_delta = abs(sample_num - edges.front().first);
 981                 const int64_t first_delta = first_sample_delta / samples_per_pixel;
 982                 e.delta = first_delta;
 983                 e.sample = edges.front().first;
 984
 985                 // Check second edge if available
 986                 if (edges.size() == 2) {
 987                         // Note: -1 because this is usually the right edge and sample points are left-aligned
 988                         const int64_t second_sample_delta = abs(sample_num - edges.back().first - 1);
 989                         const int64_t second_delta = second_sample_delta / samples_per_pixel;
 990
 991                         // If both edges are too close, we mark this signal as being dense
 992                         if ((first_delta + second_delta) <= snap_distance_)
 993                                 e.is_dense = true;
 994
 995                         if (second_delta < first_delta) {
 996                                 e.delta = second_delta;
 997                                 e.sample = edges.back().first;
 998                         }
 999                 }
1000         }
1001
1002         // Look for the best match: non-dense first, then dense
1003         entry_t *match = nullptr;
1004
1005         for (entry_t &e : list) {
1006                 if (e.delta > snap_distance_ || e.is_dense)
1007                         continue;
1008
1009                 if (match) {
1010                         if (e.delta < match->delta)
1011                                 match = &e;
1012                 } else
1013                         match = &e;
1014         }
1015
1016         if (!match) {
1017                 for (entry_t &e : list) {
1018                         if (!e.is_dense)
1019                                 continue;
1020
1021                         if (match) {
1022                                 if (e.delta < match->delta)
1023                                         match = &e;
1024                         } else
1025                                 match = &e;
1026                 }
1027         }
1028
1029         if (match) {
1030                 // Somewhat ugly hack to make TimeItem::drag_by() work
1031                 signal_under_mouse_cursor_ = match->signal;
1032
1033                 return match->sample;
1034         }
1035
1036         return -1;
1037 }
1038
1039 void View::restack_all_trace_tree_items()
1040 {
1041         // Make a list of owners that is sorted from deepest first
1042         const vector<shared_ptr<TraceTreeItem>> items(
1043                 list_by_type<TraceTreeItem>());
1044         set< TraceTreeItemOwner* > owners;
1045         for (const auto &r : items)
1046                 owners.insert(r->owner());
1047         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
1048         sort(sorted_owners.begin(), sorted_owners.end(),
1049                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
1050                         return a->depth() > b->depth(); });
1051
1052         // Restack the items recursively
1053         for (auto &o : sorted_owners)
1054                 o->restack_items();
1055
1056         // Animate the items to their destination
1057         for (const auto &i : items)
1058                 i->animate_to_layout_v_offset();
1059 }
1060
1061 int View::header_width() const
1062 {
1063          return header_->extended_size_hint().width();
1064 }
1065
1066 void View::on_setting_changed(const QString &key, const QVariant &value)
1067 {
1068         GlobalSettings settings;
1069
1070         if (key == GlobalSettings::Key_View_ColoredBG) {
1071                 colored_bg_ = settings.value(GlobalSettings::Key_View_ColoredBG).toBool();
1072                 viewport_->update();
1073         }
1074
1075         if ((key == GlobalSettings::Key_View_ShowSamplingPoints) ||
1076            (key == GlobalSettings::Key_View_ShowAnalogMinorGrid))
1077                 viewport_->update();
1078
1079         if (key == GlobalSettings::Key_View_TriggerIsZeroTime)
1080                 on_settingViewTriggerIsZeroTime_changed(value);
1081
1082         if (key == GlobalSettings::Key_View_SnapDistance)
1083                 snap_distance_ = settings.value(GlobalSettings::Key_View_SnapDistance).toInt();
1084 }
1085
1086 void View::trigger_event(int segment_id, util::Timestamp location)
1087 {
1088         // TODO This doesn't work if we're showing multiple segments at once
1089         if ((uint32_t)segment_id != current_segment_)
1090                 return;
1091
1092         if (!custom_zero_offset_set_)
1093                 reset_zero_position();
1094
1095         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
1096 }
1097
1098 void View::get_scroll_layout(double &length, Timestamp &offset) const
1099 {
1100         const pair<Timestamp, Timestamp> extents = get_time_extents();
1101         length = ((extents.second - extents.first) / scale_).convert_to<double>();
1102         offset = offset_ / scale_;
1103 }
1104
1105 void View::set_zoom(double scale, int offset)
1106 {
1107         // Reset the "always zoom to fit" feature as the user changed the zoom
1108         always_zoom_to_fit_ = false;
1109         always_zoom_to_fit_changed(false);
1110
1111         const Timestamp cursor_offset = offset_ + scale_ * offset;
1112         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
1113         const Timestamp new_offset = cursor_offset - new_scale * offset;
1114         set_scale_offset(new_scale.convert_to<double>(), new_offset);
1115 }
1116
1117 void View::calculate_tick_spacing()
1118 {
1119         const double SpacingIncrement = 10.0f;
1120         const double MinValueSpacing = 40.0f;
1121
1122         // Figure out the highest numeric value visible on a label
1123         const QSize areaSize = viewport_->size();
1124         const Timestamp max_time = max(fabs(offset_),
1125                 fabs(offset_ + scale_ * areaSize.width()));
1126
1127         double min_width = SpacingIncrement;
1128         double label_width, tick_period_width;
1129
1130         QFontMetrics m(QApplication::font());
1131
1132         // Copies of the member variables with the same name, used in the calculation
1133         // and written back afterwards, so that we don't emit signals all the time
1134         // during the calculation.
1135         pv::util::Timestamp tick_period = tick_period_;
1136         pv::util::SIPrefix tick_prefix = tick_prefix_;
1137         unsigned tick_precision = tick_precision_;
1138
1139         do {
1140                 const double min_period = scale_ * min_width;
1141
1142                 const int order = (int)floorf(log10f(min_period));
1143                 const pv::util::Timestamp order_decimal =
1144                         pow(pv::util::Timestamp(10), order);
1145
1146                 // Allow for a margin of error so that a scale unit of 1 can be used.
1147                 // Otherwise, for a SU of 1 the tick period will almost always be below
1148                 // the min_period by a small amount - and thus skipped in favor of 2.
1149                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
1150                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
1151                 double tp_with_margin;
1152                 unsigned int unit = 0;
1153
1154                 do {
1155                         tp_with_margin = order_decimal.convert_to<double>() *
1156                                 (ScaleUnits[unit++] + tp_margin);
1157                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
1158
1159                 minor_tick_count_ = (unit == 2) ? 4 : 5;
1160                 tick_period = order_decimal * ScaleUnits[unit - 1];
1161                 tick_prefix = static_cast<pv::util::SIPrefix>(
1162                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
1163
1164                 // Precision is the number of fractional digits required, not
1165                 // taking the prefix into account (and it must never be negative)
1166                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
1167
1168                 tick_period_width = (tick_period / scale_).convert_to<double>();
1169
1170                 const QString label_text = Ruler::format_time_with_distance(
1171                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
1172
1173                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
1174                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
1175                                 MinValueSpacing;
1176
1177                 min_width += SpacingIncrement;
1178         } while (tick_period_width < label_width);
1179
1180         set_tick_period(tick_period);
1181         set_tick_prefix(tick_prefix);
1182         set_tick_precision(tick_precision);
1183 }
1184
1185 void View::adjust_top_margin()
1186 {
1187         assert(viewport_);
1188
1189         const QSize areaSize = viewport_->size();
1190
1191         const pair<int, int> extents = v_extents();
1192         const int top_margin = owner_visual_v_offset() + extents.first;
1193         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
1194
1195         // Do we have empty space at the top while the last trace goes out of screen?
1196         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
1197                 const int trace_height = extents.second - extents.first;
1198
1199                 // Center everything vertically if there is enough space
1200                 if (areaSize.height() >= trace_height)
1201                         set_v_offset(extents.first -
1202                                 ((areaSize.height() - trace_height) / 2));
1203                 else
1204                         // Remove the top margin to make as many traces fit on screen as possible
1205                         set_v_offset(extents.first);
1206         }
1207 }
1208
1209 void View::update_scroll()
1210 {
1211         assert(viewport_);
1212         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
1213         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
1214
1215         const QSize areaSize = viewport_->size();
1216
1217         // Set the horizontal scroll bar
1218         double length = 0;
1219         Timestamp offset;
1220         get_scroll_layout(length, offset);
1221         length = max(length - areaSize.width(), 0.0);
1222
1223         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
1224
1225         hscrollbar->setPageStep(areaSize.width() / 2);
1226         hscrollbar->setSingleStep(major_tick_distance);
1227
1228         updating_scroll_ = true;
1229
1230         if (length < MaxScrollValue) {
1231                 hscrollbar->setRange(0, length);
1232                 hscrollbar->setSliderPosition(offset.convert_to<double>());
1233         } else {
1234                 hscrollbar->setRange(0, MaxScrollValue);
1235                 hscrollbar->setSliderPosition(
1236                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
1237         }
1238
1239         updating_scroll_ = false;
1240
1241         // Set the vertical scrollbar
1242         vscrollbar->setPageStep(areaSize.height());
1243         vscrollbar->setSingleStep(areaSize.height() / 8);
1244
1245         const pair<int, int> extents = v_extents();
1246
1247         // Don't change the scrollbar range if there are no traces
1248         if (extents.first != extents.second)
1249                 vscrollbar->setRange(extents.first - areaSize.height(),
1250                         extents.second);
1251
1252         if (scroll_needs_defaults_) {
1253                 set_scroll_default();
1254                 scroll_needs_defaults_ = false;
1255         }
1256 }
1257
1258 void View::reset_scroll()
1259 {
1260         scrollarea_->verticalScrollBar()->setRange(0, 0);
1261 }
1262
1263 void View::set_scroll_default()
1264 {
1265         assert(viewport_);
1266
1267         const QSize areaSize = viewport_->size();
1268
1269         const pair<int, int> extents = v_extents();
1270         const int trace_height = extents.second - extents.first;
1271
1272         // Do all traces fit in the view?
1273         if (areaSize.height() >= trace_height)
1274                 // Center all traces vertically
1275                 set_v_offset(extents.first -
1276                         ((areaSize.height() - trace_height) / 2));
1277         else
1278                 // Put the first trace at the top, letting the bottom ones overflow
1279                 set_v_offset(extents.first);
1280 }
1281
1282 void View::determine_if_header_was_shrunk()
1283 {
1284         const int header_pane_width =
1285                 splitter_->sizes().front();  // clazy:exclude=detaching-temporary
1286
1287         // Allow for a slight margin of error so that we also accept
1288         // slight differences when e.g. a label name change increased
1289         // the overall width
1290         header_was_shrunk_ = (header_pane_width < (header_width() - 10));
1291 }
1292
1293 void View::resize_header_to_fit()
1294 {
1295         // Setting the maximum width of the header widget doesn't work as
1296         // expected because the splitter would allow the user to make the
1297         // pane wider than that, creating empty space as a result.
1298         // To make this work, we stricly enforce the maximum width by
1299         // expanding the header unless the user shrunk it on purpose.
1300         // As we're then setting the width of the header pane, we set the
1301         // splitter to the maximum allowed position.
1302
1303         int splitter_area_width = 0;
1304         for (int w : splitter_->sizes())  // clazy:exclude=range-loop
1305                 splitter_area_width += w;
1306
1307         // Make sure the header has enough horizontal space to show all labels fully
1308         QList<int> pane_sizes;
1309         pane_sizes.push_back(header_->extended_size_hint().width());
1310         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1311         splitter_->setSizes(pane_sizes);
1312 }
1313
1314 void View::update_layout()
1315 {
1316         update_scroll();
1317 }
1318
1319 TraceTreeItemOwner* View::find_prevalent_trace_group(
1320         const shared_ptr<sigrok::ChannelGroup> &group,
1321         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1322                 &signal_map)
1323 {
1324         assert(group);
1325
1326         unordered_set<TraceTreeItemOwner*> owners;
1327         vector<TraceTreeItemOwner*> owner_list;
1328
1329         // Make a set and a list of all the owners
1330         for (const auto& channel : group->channels()) {
1331                 for (auto& entry : signal_map) {
1332                         if (entry.first->channel() == channel) {
1333                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1334                                 owner_list.push_back(o);
1335                                 owners.insert(o);
1336                         }
1337                 }
1338         }
1339
1340         // Iterate through the list of owners, and find the most prevalent
1341         size_t max_prevalence = 0;
1342         TraceTreeItemOwner *prevalent_owner = nullptr;
1343         for (TraceTreeItemOwner *owner : owners) {
1344                 const size_t prevalence = count_if(
1345                         owner_list.begin(), owner_list.end(),
1346                         [&](TraceTreeItemOwner *o) { return o == owner; });
1347                 if (prevalence > max_prevalence) {
1348                         max_prevalence = prevalence;
1349                         prevalent_owner = owner;
1350                 }
1351         }
1352
1353         return prevalent_owner;
1354 }
1355
1356 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1357         const vector< shared_ptr<sigrok::Channel> > &channels,
1358         const unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1359                 &signal_map,
1360         set< shared_ptr<Trace> > &add_list)
1361 {
1362         vector< shared_ptr<Trace> > filtered_traces;
1363
1364         for (const auto& channel : channels) {
1365                 for (auto& entry : signal_map) {
1366                         if (entry.first->channel() == channel) {
1367                                 shared_ptr<Trace> trace = entry.second;
1368                                 const auto list_iter = add_list.find(trace);
1369                                 if (list_iter == add_list.end())
1370                                         continue;
1371
1372                                 filtered_traces.push_back(trace);
1373                                 add_list.erase(list_iter);
1374                         }
1375                 }
1376         }
1377
1378         return filtered_traces;
1379 }
1380
1381 void View::determine_time_unit()
1382 {
1383         // Check whether we know the sample rate and hence can use time as the unit
1384         if (time_unit_ == util::TimeUnit::Samples) {
1385                 // Check all signals but...
1386                 for (const shared_ptr<Signal>& signal : signals_) {
1387                         const shared_ptr<SignalData> data = signal->data();
1388
1389                         // ...only check first segment of each
1390                         const vector< shared_ptr<Segment> > segments = data->segments();
1391                         if (!segments.empty())
1392                                 if (segments[0]->samplerate()) {
1393                                         set_time_unit(util::TimeUnit::Time);
1394                                         break;
1395                                 }
1396                 }
1397         }
1398 }
1399
1400 bool View::eventFilter(QObject *object, QEvent *event)
1401 {
1402         const QEvent::Type type = event->type();
1403
1404         if (type == QEvent::MouseMove) {
1405
1406                 if (object)
1407                         hover_widget_ = qobject_cast<QWidget*>(object);
1408
1409                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1410                 if (object == viewport_)
1411                         hover_point_ = mouse_event->pos();
1412                 else if (object == ruler_)
1413                         hover_point_ = mouse_event->pos();
1414                 else if (object == header_)
1415                         hover_point_ = QPoint(0, mouse_event->y());
1416                 else
1417                         hover_point_ = QPoint(-1, -1);
1418
1419                 update_hover_point();
1420
1421                 if (grabbed_widget_) {
1422                         int64_t nearest = get_nearest_level_change(hover_point_);
1423                         pv::util::Timestamp mouse_time = offset_ + hover_point_.x() * scale_;
1424
1425                         if (nearest == -1) {
1426                                 grabbed_widget_->set_time(mouse_time);
1427                         } else {
1428                                 grabbed_widget_->set_time(nearest / get_signal_under_mouse_cursor()->base()->get_samplerate());
1429                         }
1430                 }
1431
1432         } else if (type == QEvent::MouseButtonPress) {
1433                 grabbed_widget_ = nullptr;
1434
1435                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1436                 if ((object == viewport_) && (mouse_event->button() & Qt::LeftButton)) {
1437                         // Send event to all trace tree items
1438                         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1439                                 list_by_type<TraceTreeItem>());
1440                         for (const shared_ptr<TraceTreeItem>& r : trace_tree_items)
1441                                 r->mouse_left_press_event(mouse_event);
1442                 }
1443         } else if (type == QEvent::Leave) {
1444                 hover_point_ = QPoint(-1, -1);
1445                 update_hover_point();
1446         } else if (type == QEvent::Show) {
1447
1448                 // This is somewhat of a hack, unfortunately. We cannot use
1449                 // set_v_offset() from within restore_settings() as the view
1450                 // at that point is neither visible nor properly sized.
1451                 // This is the least intrusive workaround I could come up
1452                 // with: set the vertical offset (or scroll defaults) when
1453                 // the view is shown, which happens after all widgets were
1454                 // resized to their final sizes.
1455                 update_layout();
1456
1457                 if (settings_restored_)
1458                         determine_if_header_was_shrunk();
1459                 else
1460                         resize_header_to_fit();
1461
1462                 if (scroll_needs_defaults_) {
1463                         set_scroll_default();
1464                         scroll_needs_defaults_ = false;
1465                 }
1466
1467                 if (saved_v_offset_) {
1468                         set_v_offset(saved_v_offset_);
1469                         saved_v_offset_ = 0;
1470                 }
1471         }
1472
1473         return QObject::eventFilter(object, event);
1474 }
1475
1476 void View::contextMenuEvent(QContextMenuEvent *event)
1477 {
1478         QPoint pos = event->pos() - QPoint(0, ruler_->sizeHint().height());
1479
1480         const shared_ptr<ViewItem> r = viewport_->get_mouse_over_item(pos);
1481         if (!r)
1482                 return;
1483
1484         QMenu *menu = r->create_view_context_menu(this, pos);
1485         if (menu)
1486                 menu->popup(event->globalPos());
1487 }
1488
1489 void View::resizeEvent(QResizeEvent* event)
1490 {
1491         // Only adjust the top margin if we shrunk vertically
1492         if (event->size().height() < event->oldSize().height())
1493                 adjust_top_margin();
1494
1495         update_layout();
1496 }
1497
1498 void View::update_hover_point()
1499 {
1500         // Determine signal that the mouse cursor is hovering over
1501         signal_under_mouse_cursor_.reset();
1502         if (hover_widget_ == this) {
1503                 for (const shared_ptr<Signal>& s : signals_) {
1504                         const pair<int, int> extents = s->v_extents();
1505                         const int top = s->get_visual_y() + extents.first;
1506                         const int btm = s->get_visual_y() + extents.second;
1507                         if ((hover_point_.y() >= top) && (hover_point_.y() <= btm)
1508                                 && s->base()->enabled())
1509                                 signal_under_mouse_cursor_ = s;
1510                 }
1511         }
1512
1513         // Update all trace tree items
1514         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1515                 list_by_type<TraceTreeItem>());
1516         for (const shared_ptr<TraceTreeItem>& r : trace_tree_items)
1517                 r->hover_point_changed(hover_point_);
1518
1519         // Notify any other listeners
1520         hover_point_changed(hover_widget_, hover_point_);
1521 }
1522
1523 void View::row_item_appearance_changed(bool label, bool content)
1524 {
1525         if (label)
1526                 header_->update();
1527         if (content)
1528                 viewport_->update();
1529 }
1530
1531 void View::time_item_appearance_changed(bool label, bool content)
1532 {
1533         if (label) {
1534                 ruler_->update();
1535
1536                 // Make sure the header pane width is updated, too
1537                 update_layout();
1538         }
1539
1540         if (content)
1541                 viewport_->update();
1542 }
1543
1544 void View::extents_changed(bool horz, bool vert)
1545 {
1546         sticky_events_ |=
1547                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1548                 (vert ? TraceTreeItemVExtentsChanged : 0);
1549
1550         lazy_event_handler_.stop();
1551         lazy_event_handler_.start();
1552 }
1553
1554 void View::on_signal_name_changed()
1555 {
1556         if (!header_was_shrunk_)
1557                 resize_header_to_fit();
1558 }
1559
1560 void View::on_splitter_moved()
1561 {
1562         // The header can only shrink when the splitter is moved manually
1563         determine_if_header_was_shrunk();
1564
1565         if (!header_was_shrunk_)
1566                 resize_header_to_fit();
1567 }
1568
1569 void View::on_zoom_in_shortcut_triggered()
1570 {
1571         zoom(1);
1572 }
1573
1574 void View::on_zoom_out_shortcut_triggered()
1575 {
1576         zoom(-1);
1577 }
1578
1579 void View::on_scroll_to_start_shortcut_triggered()
1580 {
1581         set_h_offset(0);
1582 }
1583
1584 void View::on_scroll_to_end_shortcut_triggered()
1585 {
1586         set_h_offset(get_h_scrollbar_maximum());
1587 }
1588
1589 void View::h_scroll_value_changed(int value)
1590 {
1591         if (updating_scroll_)
1592                 return;
1593
1594         // Disable sticky scrolling when user moves the horizontal scroll bar
1595         // during a running acquisition
1596         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1597                 sticky_scrolling_ = false;
1598                 sticky_scrolling_changed(false);
1599         }
1600
1601         const int range = scrollarea_->horizontalScrollBar()->maximum();
1602         if (range < MaxScrollValue)
1603                 set_offset(scale_ * value);
1604         else {
1605                 double length = 0;
1606                 Timestamp offset;
1607                 get_scroll_layout(length, offset);
1608                 set_offset(scale_ * length * value / MaxScrollValue);
1609         }
1610
1611         ruler_->update();
1612         viewport_->update();
1613 }
1614
1615 void View::v_scroll_value_changed()
1616 {
1617         header_->update();
1618         viewport_->update();
1619 }
1620
1621 void View::on_grab_ruler(int ruler_id)
1622 {
1623         if (!cursors_shown()) {
1624                 center_cursors();
1625                 show_cursors();
1626         }
1627
1628         // Release the grabbed widget if its trigger hotkey was pressed twice
1629         if (ruler_id == 1)
1630                 grabbed_widget_ = (grabbed_widget_ == cursors_->first().get()) ?
1631                         nullptr : cursors_->first().get();
1632         else
1633                 grabbed_widget_ = (grabbed_widget_ == cursors_->second().get()) ?
1634                         nullptr : cursors_->second().get();
1635
1636         if (grabbed_widget_)
1637                 grabbed_widget_->set_time(ruler_->get_absolute_time_from_x_pos(
1638                         mapFromGlobal(QCursor::pos()).x() - header_width()));
1639 }
1640
1641 void View::signals_changed()
1642 {
1643         using sigrok::Channel;
1644
1645         vector< shared_ptr<Channel> > channels;
1646         shared_ptr<sigrok::Device> sr_dev;
1647         bool signals_added_or_removed = false;
1648
1649         // Do we need to set the vertical scrollbar to its default position later?
1650         // We do if there are no traces, i.e. the scroll bar has no range set
1651         bool reset_scrollbar =
1652                 (scrollarea_->verticalScrollBar()->minimum() ==
1653                         scrollarea_->verticalScrollBar()->maximum());
1654
1655         if (!session_.device()) {
1656                 reset_scroll();
1657                 signals_.clear();
1658         } else {
1659                 sr_dev = session_.device()->device();
1660                 assert(sr_dev);
1661                 channels = sr_dev->channels();
1662         }
1663
1664         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1665
1666         // Make a list of traces that are being added, and a list of traces
1667         // that are being removed
1668         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1669         const set<shared_ptr<Trace>> prev_traces(
1670                 prev_trace_list.begin(), prev_trace_list.end());
1671
1672         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1673
1674 #ifdef ENABLE_DECODE
1675         traces.insert(decode_traces_.begin(), decode_traces_.end());
1676 #endif
1677
1678         set< shared_ptr<Trace> > add_traces;
1679         set_difference(traces.begin(), traces.end(),
1680                 prev_traces.begin(), prev_traces.end(),
1681                 inserter(add_traces, add_traces.begin()));
1682
1683         set< shared_ptr<Trace> > remove_traces;
1684         set_difference(prev_traces.begin(), prev_traces.end(),
1685                 traces.begin(), traces.end(),
1686                 inserter(remove_traces, remove_traces.begin()));
1687
1688         // Make a look-up table of sigrok Channels to pulseview Signals
1689         unordered_map<shared_ptr<data::SignalBase>, shared_ptr<Signal> >
1690                 signal_map;
1691         for (const shared_ptr<Signal>& sig : signals_)
1692                 signal_map[sig->base()] = sig;
1693
1694         // Populate channel groups
1695         if (sr_dev)
1696                 for (auto& entry : sr_dev->channel_groups()) {
1697                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1698
1699                         if (group->channels().size() <= 1)
1700                                 continue;
1701
1702                         // Find best trace group to add to
1703                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1704                                 group, signal_map);
1705
1706                         // If there is no trace group, create one
1707                         shared_ptr<TraceGroup> new_trace_group;
1708                         if (!owner) {
1709                                 new_trace_group.reset(new TraceGroup());
1710                                 owner = new_trace_group.get();
1711                         }
1712
1713                         // Extract traces for the trace group, removing them from
1714                         // the add list
1715                         const vector< shared_ptr<Trace> > new_traces_in_group =
1716                                 extract_new_traces_for_channels(group->channels(),
1717                                         signal_map, add_traces);
1718
1719                         // Add the traces to the group
1720                         const pair<int, int> prev_v_extents = owner->v_extents();
1721                         int offset = prev_v_extents.second - prev_v_extents.first;
1722                         for (const shared_ptr<Trace>& trace : new_traces_in_group) {
1723                                 assert(trace);
1724                                 owner->add_child_item(trace);
1725
1726                                 const pair<int, int> extents = trace->v_extents();
1727                                 if (trace->enabled())
1728                                         offset += -extents.first;
1729                                 trace->force_to_v_offset(offset);
1730                                 if (trace->enabled())
1731                                         offset += extents.second;
1732                         }
1733
1734                         if (new_trace_group) {
1735                                 // Assign proper vertical offsets to each channel in the group
1736                                 new_trace_group->restack_items();
1737
1738                                 // If this is a new group, enqueue it in the new top level
1739                                 // items list
1740                                 if (!new_traces_in_group.empty())
1741                                         new_top_level_items.push_back(new_trace_group);
1742                         }
1743                 }
1744
1745         // Enqueue the remaining logic channels in a group
1746         vector< shared_ptr<Channel> > logic_channels;
1747         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1748                 [](const shared_ptr<Channel>& c) {
1749                         return c->type() == sigrok::ChannelType::LOGIC; });
1750
1751         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1752                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1753
1754         if (non_grouped_logic_signals.size() > 0) {
1755                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1756                         make_shared<TraceGroup>());
1757                 for (const shared_ptr<Trace>& trace : non_grouped_logic_signals)
1758                         non_grouped_trace_group->add_child_item(trace);
1759
1760                 non_grouped_trace_group->restack_items();
1761                 new_top_level_items.push_back(non_grouped_trace_group);
1762         }
1763
1764         // Enqueue the remaining channels as free ungrouped traces
1765         const vector< shared_ptr<Trace> > new_top_level_signals =
1766                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1767         new_top_level_items.insert(new_top_level_items.end(),
1768                 new_top_level_signals.begin(), new_top_level_signals.end());
1769
1770         // Enqueue any remaining traces i.e. decode traces
1771         new_top_level_items.insert(new_top_level_items.end(),
1772                 add_traces.begin(), add_traces.end());
1773
1774         // Remove any removed traces
1775         for (const shared_ptr<Trace>& trace : remove_traces) {
1776                 TraceTreeItemOwner *const owner = trace->owner();
1777                 assert(owner);
1778                 owner->remove_child_item(trace);
1779                 signals_added_or_removed = true;
1780         }
1781
1782         // Remove any empty trace groups
1783         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1784                 if (group->child_items().size() == 0) {
1785                         remove_child_item(group);
1786                         group.reset();
1787                 }
1788
1789         // Add and position the pending top levels items
1790         int offset = v_extents().second;
1791         for (auto item : new_top_level_items) {
1792                 add_child_item(item);
1793
1794                 // Position the item after the last item or at the top if there is none
1795                 const pair<int, int> extents = item->v_extents();
1796
1797                 if (item->enabled())
1798                         offset += -extents.first;
1799
1800                 item->force_to_v_offset(offset);
1801
1802                 if (item->enabled())
1803                         offset += extents.second;
1804                 signals_added_or_removed = true;
1805         }
1806
1807
1808         if (signals_added_or_removed && !header_was_shrunk_)
1809                 resize_header_to_fit();
1810
1811         update_layout();
1812
1813         header_->update();
1814         viewport_->update();
1815
1816         if (reset_scrollbar)
1817                 set_scroll_default();
1818 }
1819
1820 void View::capture_state_updated(int state)
1821 {
1822         GlobalSettings settings;
1823
1824         if (state == Session::Running) {
1825                 set_time_unit(util::TimeUnit::Samples);
1826
1827                 trigger_markers_.clear();
1828                 if (!custom_zero_offset_set_)
1829                         set_zero_position(0);
1830
1831                 scale_at_acq_start_ = scale_;
1832                 offset_at_acq_start_ = offset_;
1833
1834                 // Activate "always zoom to fit" if the setting is enabled and we're
1835                 // the main view of this session (other trace views may be used for
1836                 // zooming and we don't want to mess them up)
1837                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1838                 if (is_main_view_ && state) {
1839                         always_zoom_to_fit_ = true;
1840                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1841                 }
1842
1843                 // Enable sticky scrolling if the setting is enabled
1844                 sticky_scrolling_ = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1845
1846                 // Reset all traces to segment 0
1847                 current_segment_ = 0;
1848                 set_current_segment(current_segment_);
1849         }
1850
1851         if (state == Session::Stopped) {
1852                 // After acquisition has stopped we need to re-calculate the ticks once
1853                 // as it's otherwise done when the user pans or zooms, which is too late
1854                 calculate_tick_spacing();
1855
1856                 // Reset "always zoom to fit", the acquisition has stopped
1857                 if (always_zoom_to_fit_) {
1858                         // Perform a final zoom-to-fit before disabling
1859                         zoom_fit(always_zoom_to_fit_);
1860                         always_zoom_to_fit_ = false;
1861                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1862                 }
1863
1864                 bool zoom_to_fit_after_acq =
1865                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1866
1867                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1868                 // we didn't restore settings in the meanwhile
1869                 if (zoom_to_fit_after_acq &&
1870                         !suppress_zoom_to_fit_after_acq_ &&
1871                         (scale_ == scale_at_acq_start_) &&
1872                         (offset_ == offset_at_acq_start_))
1873                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1874
1875                 suppress_zoom_to_fit_after_acq_ = false;
1876         }
1877 }
1878
1879 void View::on_new_segment(int new_segment_id)
1880 {
1881         on_segment_changed(new_segment_id);
1882 }
1883
1884 void View::on_segment_completed(int segment_id)
1885 {
1886         on_segment_changed(segment_id);
1887 }
1888
1889 void View::on_segment_changed(int segment)
1890 {
1891         switch (segment_display_mode_) {
1892         case Trace::ShowLastSegmentOnly:
1893         case Trace::ShowSingleSegmentOnly:
1894                 set_current_segment(segment);
1895                 break;
1896
1897         case Trace::ShowLastCompleteSegmentOnly:
1898                 // Only update if all segments are complete
1899                 if (session_.all_segments_complete(segment))
1900                         set_current_segment(segment);
1901                 break;
1902
1903         case Trace::ShowAllSegments:
1904         case Trace::ShowAccumulatedIntensity:
1905         default:
1906                 break;
1907         }
1908 }
1909
1910 void View::on_settingViewTriggerIsZeroTime_changed(const QVariant new_value)
1911 {
1912         if (!custom_zero_offset_set_)
1913                 reset_zero_position();
1914 }
1915
1916 void View::perform_delayed_view_update()
1917 {
1918         if (always_zoom_to_fit_) {
1919                 zoom_fit(true);
1920         } else if (sticky_scrolling_) {
1921                 // Make right side of the view sticky
1922                 double length = 0;
1923                 Timestamp offset;
1924                 get_scroll_layout(length, offset);
1925
1926                 const QSize areaSize = viewport_->size();
1927                 length = max(length - areaSize.width(), 0.0);
1928
1929                 set_offset(scale_ * length);
1930         }
1931
1932         determine_time_unit();
1933         update_scroll();
1934         ruler_->update();
1935         viewport_->update();
1936 }
1937
1938 void View::process_sticky_events()
1939 {
1940         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1941                 update_layout();
1942         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1943                 restack_all_trace_tree_items();
1944                 update_scroll();
1945         }
1946
1947         // Clear the sticky events
1948         sticky_events_ = 0;
1949 }
1950
1951 } // namespace trace
1952 } // namespace views
1953 } // namespace pv