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
  33 #include <QApplication>
  34 #include <QDebug>
  35 #include <QEvent>
  36 #include <QFontMetrics>
  37 #include <QMenu>
  38 #include <QMouseEvent>
  39 #include <QScrollBar>
  40 #include <QVBoxLayout>
  41
  42 #include <libsigrokcxx/libsigrokcxx.hpp>
  43
  44 #include "analogsignal.hpp"
  45 #include "header.hpp"
  46 #include "logicsignal.hpp"
  47 #include "ruler.hpp"
  48 #include "signal.hpp"
  49 #include "tracegroup.hpp"
  50 #include "triggermarker.hpp"
  51 #include "view.hpp"
  52 #include "viewport.hpp"
  53
  54 #include "pv/metadata_obj.hpp"
  55 #include "pv/data/logic.hpp"
  56 #include "pv/data/logicsegment.hpp"
  57 #include "pv/data/signalbase.hpp"
  58 #include "pv/devices/device.hpp"
  59 #include "pv/globalsettings.hpp"
  60 #include "pv/session.hpp"
  61 #include "pv/util.hpp"
  62
  63 #ifdef ENABLE_DECODE
  64 #include "decodetrace.hpp"
  65 #endif
  66
  67 using pv::data::SignalBase;
  68 using pv::data::SignalData;
  69 using pv::data::Segment;
  70 using pv::util::TimeUnit;
  71 using pv::util::Timestamp;
  72
  73 using std::back_inserter;
  74 using std::copy_if;
  75 using std::count_if;
  76 using std::inserter;
  77 using std::lock_guard;
  78 using std::max;
  79 using std::make_pair;
  80 using std::make_shared;
  81 using std::min;
  82 using std::numeric_limits;
  83 using std::pair;
  84 using std::set;
  85 using std::set_difference;
  86 using std::shared_ptr;
  87 using std::vector;
  88
  89 namespace pv {
  90 namespace views {
  91 namespace trace {
  92
  93 const Timestamp View::MaxScale("1e9");
  94 const Timestamp View::MinScale("1e-12");
  95
  96 const int View::MaxScrollValue = INT_MAX / 2;
  97
  98 /* Area at the top and bottom of the view that can't be scrolled out of sight */
  99 const int View::ViewScrollMargin = 50;
 100
 101 const int View::ScaleUnits[3] = {1, 2, 5};
 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, QMainWindow *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         scroll_needs_defaults_(true)
 134 {
 135         QVBoxLayout *root_layout = new QVBoxLayout(this);
 136         root_layout->setContentsMargins(0, 0, 0, 0);
 137         root_layout->addWidget(splitter_);
 138
 139         viewport_ = new Viewport(*this);
 140         scrollarea_ = new CustomScrollArea(splitter_);
 141         scrollarea_->setViewport(viewport_);
 142         scrollarea_->setFrameShape(QFrame::NoFrame);
 143
 144         ruler_ = new Ruler(*this);
 145
 146         header_ = new Header(*this);
 147         header_->setMinimumWidth(10);  // So that the arrow tips show at least
 148
 149         // We put the header into a simple layout so that we can add the top margin,
 150         // allowing us to make it line up with the bottom of the ruler
 151         QWidget *header_container = new QWidget();
 152         header_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 153         QVBoxLayout *header_layout = new QVBoxLayout(header_container);
 154         header_layout->setContentsMargins(0, ruler_->sizeHint().height(), 0, 0);
 155         header_layout->addWidget(header_);
 156
 157         // To let the ruler and scrollarea be on the same split pane, we need a layout
 158         QWidget *trace_container = new QWidget();
 159         trace_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 160         QVBoxLayout *trace_layout = new QVBoxLayout(trace_container);
 161         trace_layout->setSpacing(0);  // We don't want space between the ruler and scrollarea
 162         trace_layout->setContentsMargins(0, 0, 0, 0);
 163         trace_layout->addWidget(ruler_);
 164         trace_layout->addWidget(scrollarea_);
 165
 166         splitter_->addWidget(header_container);
 167         splitter_->addWidget(trace_container);
 168         splitter_->setHandleWidth(1);  // Don't show a visible rubber band
 169         splitter_->setCollapsible(0, false);  // Prevent the header from collapsing
 170         splitter_->setCollapsible(1, false);  // Prevent the traces from collapsing
 171         splitter_->setStretchFactor(0, 0);  // Prevent the panes from being resized
 172         splitter_->setStretchFactor(1, 1);  // when the entire view is resized
 173         splitter_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 174
 175         viewport_->installEventFilter(this);
 176         ruler_->installEventFilter(this);
 177         header_->installEventFilter(this);
 178
 179         // Set up settings and event handlers
 180         GlobalSettings settings;
 181         colored_bg_ = settings.value(GlobalSettings::Key_View_ColoredBG).toBool();
 182         snap_distance_ = settings.value(GlobalSettings::Key_View_SnapDistance).toInt();
 183
 184         GlobalSettings::add_change_handler(this);
 185
 186         // Set up metadata objects and event handlers
 187         if (is_main_view) {
 188                 session_.metadata_obj_manager()->create_object(MetadataObjMainViewRange);
 189                 session_.metadata_obj_manager()->create_object(MetadataObjMousePos);
 190         }
 191
 192         // Set up UI event handlers
 193         connect(scrollarea_->horizontalScrollBar(), SIGNAL(valueChanged(int)),
 194                 this, SLOT(h_scroll_value_changed(int)));
 195         connect(scrollarea_->verticalScrollBar(), SIGNAL(valueChanged(int)),
 196                 this, SLOT(v_scroll_value_changed()));
 197
 198         connect(header_, SIGNAL(selection_changed()),
 199                 ruler_, SLOT(clear_selection()));
 200         connect(ruler_, SIGNAL(selection_changed()),
 201                 header_, SLOT(clear_selection()));
 202
 203         connect(header_, SIGNAL(selection_changed()),
 204                 this, SIGNAL(selection_changed()));
 205         connect(ruler_, SIGNAL(selection_changed()),
 206                 this, SIGNAL(selection_changed()));
 207
 208         connect(splitter_, SIGNAL(splitterMoved(int, int)),
 209                 this, SLOT(on_splitter_moved()));
 210
 211         connect(&lazy_event_handler_, SIGNAL(timeout()),
 212                 this, SLOT(process_sticky_events()));
 213         lazy_event_handler_.setSingleShot(true);
 214         lazy_event_handler_.setInterval(1000 / ViewBase::MaxViewAutoUpdateRate);
 215
 216         // Set up local keyboard shortcuts
 217         zoom_in_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Plus), this,
 218                 SLOT(on_zoom_in_shortcut_triggered()), nullptr, Qt::WidgetWithChildrenShortcut);
 219         zoom_in_shortcut_->setAutoRepeat(false);
 220
 221         zoom_out_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Minus), this,
 222                 SLOT(on_zoom_out_shortcut_triggered()), nullptr, Qt::WidgetWithChildrenShortcut);
 223         zoom_out_shortcut_->setAutoRepeat(false);
 224
 225         zoom_in_shortcut_2_ = new QShortcut(QKeySequence(Qt::Key_Up), this,
 226                 SLOT(on_zoom_in_shortcut_triggered()), nullptr, Qt::WidgetWithChildrenShortcut);
 227         zoom_out_shortcut_2_ = new QShortcut(QKeySequence(Qt::Key_Down), this,
 228                 SLOT(on_zoom_out_shortcut_triggered()), nullptr, Qt::WidgetWithChildrenShortcut);
 229
 230         home_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Home), this,
 231                 SLOT(on_scroll_to_start_shortcut_triggered()), nullptr, Qt::WidgetWithChildrenShortcut);
 232         home_shortcut_->setAutoRepeat(false);
 233
 234         end_shortcut_ = new QShortcut(QKeySequence(Qt::Key_End), this,
 235                 SLOT(on_scroll_to_end_shortcut_triggered()), nullptr, Qt::WidgetWithChildrenShortcut);
 236         end_shortcut_->setAutoRepeat(false);
 237
 238         grab_ruler_left_shortcut_ = new QShortcut(QKeySequence(Qt::Key_1), this,
 239                 nullptr, nullptr, Qt::WidgetWithChildrenShortcut);
 240         connect(grab_ruler_left_shortcut_, &QShortcut::activated,
 241                 this, [=]{on_grab_ruler(1);});
 242         grab_ruler_left_shortcut_->setAutoRepeat(false);
 243
 244         grab_ruler_right_shortcut_ = new QShortcut(QKeySequence(Qt::Key_2), this,
 245                 nullptr, nullptr, Qt::WidgetWithChildrenShortcut);
 246         connect(grab_ruler_right_shortcut_, &QShortcut::activated,
 247                 this, [=]{on_grab_ruler(2);});
 248         grab_ruler_right_shortcut_->setAutoRepeat(false);
 249
 250         cancel_grab_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Escape), this,
 251                 nullptr, nullptr, Qt::WidgetWithChildrenShortcut);
 252         connect(cancel_grab_shortcut_, &QShortcut::activated,
 253                 this, [=]{grabbed_widget_ = nullptr;});
 254         cancel_grab_shortcut_->setAutoRepeat(false);
 255
 256         // Trigger the initial event manually. The default device has signals
 257         // which were created before this object came into being
 258         signals_changed();
 259
 260         // Make sure the transparent widgets are on the top
 261         ruler_->raise();
 262         header_->raise();
 263
 264         reset_view_state();
 265 }
 266
 267 View::~View()
 268 {
 269         GlobalSettings::remove_change_handler(this);
 270 }
 271
 272 ViewType View::get_type() const
 273 {
 274         return ViewTypeTrace;
 275 }
 276
 277 void View::reset_view_state()
 278 {
 279         ViewBase::reset_view_state();
 280
 281         segment_display_mode_ = Trace::ShowLastSegmentOnly;
 282         segment_selectable_ = false;
 283         scale_ = 1e-3;
 284         offset_ = 0;
 285         ruler_offset_ = 0;
 286         zero_offset_ = 0;
 287         custom_zero_offset_set_ = false;
 288         updating_scroll_ = false;
 289         restoring_state_ = false;
 290         always_zoom_to_fit_ = false;
 291         tick_period_ = 0;
 292         tick_prefix_ = pv::util::SIPrefix::yocto;
 293         tick_precision_ = 0;
 294         time_unit_ = util::TimeUnit::Time;
 295         show_cursors_ = false;
 296         cursors_ = make_shared<CursorPair>(*this);
 297         next_flag_text_ = 'A';
 298         trigger_markers_.clear();
 299         hover_widget_ = nullptr;
 300         grabbed_widget_ = nullptr;
 301         hover_point_ = QPoint(-1, -1);
 302         scroll_needs_defaults_ = true;
 303         scale_at_acq_start_ = 0;
 304         offset_at_acq_start_ = 0;
 305
 306         show_cursors_ = false;
 307         cursor_state_changed(show_cursors_);
 308         flags_.clear();
 309
 310         // Update the zoom state
 311         calculate_tick_spacing();
 312
 313         // Make sure the standard bar's segment selector is in sync
 314         set_segment_display_mode(segment_display_mode_);
 315
 316         scrollarea_->verticalScrollBar()->setRange(-100000000, 100000000);
 317 }
 318
 319 Session& View::session()
 320 {
 321         return session_;
 322 }
 323
 324 const Session& View::session() const
 325 {
 326         return session_;
 327 }
 328
 329 vector< shared_ptr<Signal> > View::signals() const
 330 {
 331         return signals_;
 332 }
 333
 334 shared_ptr<Signal> View::get_signal_by_signalbase(shared_ptr<data::SignalBase> base) const
 335 {
 336         shared_ptr<Signal> ret_val;
 337
 338         for (const shared_ptr<Signal>& s : signals_)
 339                 if (s->base() == base) {
 340                         ret_val = s;
 341                         break;
 342                 }
 343
 344         return ret_val;
 345 }
 346
 347 void View::clear_signalbases()
 348 {
 349         ViewBase::clear_signalbases();
 350         signals_.clear();
 351 }
 352
 353 void View::add_signalbase(const shared_ptr<data::SignalBase> signalbase)
 354 {
 355         ViewBase::add_signalbase(signalbase);
 356
 357         shared_ptr<Signal> signal;
 358
 359         switch (signalbase->type()) {
 360         case SignalBase::LogicChannel:
 361                 signal = shared_ptr<Signal>(new LogicSignal(session_, session_.device(), signalbase));
 362                 break;
 363
 364         case SignalBase::AnalogChannel:
 365                 signal = shared_ptr<Signal>(new AnalogSignal(session_, signalbase));
 366                 break;
 367
 368         default:
 369                 qDebug() << "Unknown signalbase type:" << signalbase->type();
 370                 assert(false);
 371                 break;
 372         }
 373
 374         signals_.push_back(signal);
 375
 376         signal->set_segment_display_mode(segment_display_mode_);
 377         signal->set_current_segment(current_segment_);
 378
 379         // Secondary views use the signal's settings in the main view
 380         if (!is_main_view()) {
 381                 shared_ptr<View> main_tv = dynamic_pointer_cast<View>(session_.main_view());
 382                 shared_ptr<Signal> main_signal = main_tv->get_signal_by_signalbase(signalbase);
 383                 if (main_signal)
 384                         signal->restore_settings(main_signal->save_settings());
 385         }
 386
 387         connect(signal->base().get(), SIGNAL(name_changed(const QString&)),
 388                 this, SLOT(on_signal_name_changed()));
 389 }
 390
 391 void View::remove_signalbase(const shared_ptr<data::SignalBase> signalbase)
 392 {
 393         ViewBase::remove_signalbase(signalbase);
 394
 395         shared_ptr<Signal> signal = get_signal_by_signalbase(signalbase);
 396
 397         if (signal)
 398                 remove_trace(signal);
 399 }
 400
 401 #ifdef ENABLE_DECODE
 402 void View::clear_decode_signals()
 403 {
 404         ViewBase::clear_decode_signals();
 405         decode_traces_.clear();
 406 }
 407
 408 void View::add_decode_signal(shared_ptr<data::DecodeSignal> signal)
 409 {
 410         ViewBase::add_decode_signal(signal);
 411
 412         shared_ptr<DecodeTrace> d(
 413                 new DecodeTrace(session_, signal, decode_traces_.size()));
 414         decode_traces_.push_back(d);
 415
 416         d->set_segment_display_mode(segment_display_mode_);
 417         d->set_current_segment(current_segment_);
 418
 419         connect(signal.get(), SIGNAL(name_changed(const QString&)),
 420                 this, SLOT(on_signal_name_changed()));
 421 }
 422
 423 void View::remove_decode_signal(shared_ptr<data::DecodeSignal> signal)
 424 {
 425         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 426                 if ((*i)->base() == signal) {
 427                         decode_traces_.erase(i);
 428                         break;
 429                 }
 430
 431         ViewBase::remove_decode_signal(signal);
 432 }
 433 #endif
 434
 435 void View::remove_trace(shared_ptr<Trace> trace)
 436 {
 437         TraceTreeItemOwner *const owner = trace->owner();
 438         assert(owner);
 439         owner->remove_child_item(trace);
 440
 441         for (auto i = signals_.begin(); i != signals_.end(); i++)
 442                 if ((*i) == trace) {
 443                         signals_.erase(i);
 444                         break;
 445                 }
 446
 447         if (!header_was_shrunk_)
 448                 resize_header_to_fit();
 449
 450         update_layout();
 451
 452         header_->update();
 453         viewport_->update();
 454 }
 455
 456 shared_ptr<Signal> View::get_signal_under_mouse_cursor() const
 457 {
 458         return signal_under_mouse_cursor_;
 459 }
 460
 461 View* View::view()
 462 {
 463         return this;
 464 }
 465
 466 const View* View::view() const
 467 {
 468         return this;
 469 }
 470
 471 Viewport* View::viewport()
 472 {
 473         return viewport_;
 474 }
 475
 476 const Viewport* View::viewport() const
 477 {
 478         return viewport_;
 479 }
 480
 481 QAbstractScrollArea* View::scrollarea() const
 482 {
 483         return scrollarea_;
 484 }
 485
 486 const Ruler* View::ruler() const
 487 {
 488         return ruler_;
 489 }
 490
 491 void View::save_settings(QSettings &settings) const
 492 {
 493         settings.setValue("scale", scale_);
 494         settings.setValue("v_offset",
 495                 scrollarea_->verticalScrollBar()->sliderPosition());
 496
 497         settings.setValue("splitter_state", splitter_->saveState());
 498         settings.setValue("segment_display_mode", segment_display_mode_);
 499
 500         GlobalSettings::store_timestamp(settings, "offset", offset_);
 501
 502         if (custom_zero_offset_set_)
 503                 GlobalSettings::store_timestamp(settings, "zero_offset", -zero_offset_);
 504         else
 505                 settings.remove("zero_offset");
 506
 507         for (const shared_ptr<Signal>& signal : signals_) {
 508                 settings.beginGroup(signal->base()->internal_name());
 509                 signal->save_settings(settings);
 510                 settings.endGroup();
 511         }
 512 }
 513
 514 void View::restore_settings(QSettings &settings)
 515 {
 516         // Note: It is assumed that this function is only called once,
 517         // immediately after restoring a previous session.
 518
 519         if (settings.contains("scale"))
 520                 set_scale(settings.value("scale").toDouble());
 521
 522         if (settings.contains("offset")) {
 523                 // This also updates ruler_offset_
 524                 set_offset(GlobalSettings::restore_timestamp(settings, "offset"));
 525         }
 526
 527         if (settings.contains("zero_offset"))
 528                 set_zero_position(GlobalSettings::restore_timestamp(settings, "zero_offset"));
 529
 530         if (settings.contains("splitter_state"))
 531                 splitter_->restoreState(settings.value("splitter_state").toByteArray());
 532
 533         if (settings.contains("segment_display_mode"))
 534                 set_segment_display_mode(
 535                         (Trace::SegmentDisplayMode)(settings.value("segment_display_mode").toInt()));
 536
 537         for (shared_ptr<Signal> signal : signals_) {
 538                 settings.beginGroup(signal->base()->internal_name());
 539                 signal->restore_settings(settings);
 540                 settings.endGroup();
 541         }
 542
 543         if (settings.contains("v_offset")) {
 544                 // Note: see eventFilter() for additional information
 545                 saved_v_offset_ = settings.value("v_offset").toInt();
 546                 scroll_needs_defaults_ = false;
 547         }
 548
 549         restoring_state_ = true;
 550
 551         // Update the ruler so that it uses the new scale
 552         calculate_tick_spacing();
 553 }
 554
 555 vector< shared_ptr<TimeItem> > View::time_items() const
 556 {
 557         const vector<shared_ptr<Flag>> f(flags());
 558         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 559
 560         if (cursors_) {
 561                 items.push_back(cursors_);
 562                 items.push_back(cursors_->first());
 563                 items.push_back(cursors_->second());
 564         }
 565
 566         for (auto& trigger_marker : trigger_markers_)
 567                 items.push_back(trigger_marker);
 568
 569         return items;
 570 }
 571
 572 double View::scale() const
 573 {
 574         return scale_;
 575 }
 576
 577 void View::set_scale(double scale)
 578 {
 579         if (scale_ != scale) {
 580                 scale_ = scale;
 581                 scale_changed();
 582         }
 583 }
 584
 585 void View::set_offset(const pv::util::Timestamp& offset, bool force_update)
 586 {
 587         if ((offset_ != offset) || force_update) {
 588                 offset_ = offset;
 589                 ruler_offset_ = offset_ + zero_offset_;
 590
 591                 const int w = viewport_->width();
 592                 if (w > 0) {
 593                         const double samplerate = session_.get_samplerate();
 594                         // Note: sample_num = time * samplerate
 595                         // Note: samples_per_pixel = samplerate * scale
 596                         int64_t start_sample = (offset_ * samplerate).convert_to<int64_t>();
 597                         int64_t end_sample = (offset_ * samplerate).convert_to<int64_t>() +
 598                                 (w * session_.get_samplerate() * scale_);
 599
 600                         MetadataObject* md_obj =
 601                                 session_.metadata_obj_manager()->find_object_by_type(MetadataObjMainViewRange);
 602                         md_obj->set_value(MetadataValueStartSample, QVariant((qlonglong)start_sample));
 603                         md_obj->set_value(MetadataValueEndSample, QVariant((qlonglong)end_sample));
 604                 }
 605
 606                 offset_changed();
 607         }
 608 }
 609
 610 const Timestamp& View::offset() const
 611 {
 612         return offset_;
 613 }
 614
 615 const Timestamp& View::ruler_offset() const
 616 {
 617         return ruler_offset_;
 618 }
 619
 620 void View::set_zero_position(const pv::util::Timestamp& position)
 621 {
 622         zero_offset_ = -position;
 623         custom_zero_offset_set_ = true;
 624
 625         // Force an immediate update of the offsets
 626         set_offset(offset_, true);
 627         ruler_->update();
 628 }
 629
 630 void View::reset_zero_position()
 631 {
 632         zero_offset_ = 0;
 633
 634         // When enabled, the first trigger for this segment is used as the zero position
 635         GlobalSettings settings;
 636         bool trigger_is_zero_time = settings.value(GlobalSettings::Key_View_TriggerIsZeroTime).toBool();
 637
 638         if (trigger_is_zero_time) {
 639                 vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
 640
 641                 if (triggers.size() > 0)
 642                         zero_offset_ = triggers.front();
 643         }
 644
 645         custom_zero_offset_set_ = false;
 646
 647         // Force an immediate update of the offsets
 648         set_offset(offset_, true);
 649         ruler_->update();
 650 }
 651
 652 pv::util::Timestamp View::zero_offset() const
 653 {
 654         return zero_offset_;
 655 }
 656
 657 int View::owner_visual_v_offset() const
 658 {
 659         return -scrollarea_->verticalScrollBar()->sliderPosition();
 660 }
 661
 662 void View::set_v_offset(int offset)
 663 {
 664         scrollarea_->verticalScrollBar()->setSliderPosition(offset);
 665         header_->update();
 666         viewport_->update();
 667 }
 668
 669 void View::set_h_offset(int offset)
 670 {
 671         scrollarea_->horizontalScrollBar()->setSliderPosition(offset);
 672         header_->update();
 673         viewport_->update();
 674 }
 675
 676 int View::get_h_scrollbar_maximum() const
 677 {
 678         return scrollarea_->horizontalScrollBar()->maximum();
 679 }
 680
 681 unsigned int View::depth() const
 682 {
 683         return 0;
 684 }
 685
 686 uint32_t View::current_segment() const
 687 {
 688         return current_segment_;
 689 }
 690
 691 pv::util::SIPrefix View::tick_prefix() const
 692 {
 693         return tick_prefix_;
 694 }
 695
 696 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 697 {
 698         if (tick_prefix_ != tick_prefix) {
 699                 tick_prefix_ = tick_prefix;
 700                 tick_prefix_changed();
 701         }
 702 }
 703
 704 unsigned int View::tick_precision() const
 705 {
 706         return tick_precision_;
 707 }
 708
 709 void View::set_tick_precision(unsigned tick_precision)
 710 {
 711         if (tick_precision_ != tick_precision) {
 712                 tick_precision_ = tick_precision;
 713                 tick_precision_changed();
 714         }
 715 }
 716
 717 const pv::util::Timestamp& View::tick_period() const
 718 {
 719         return tick_period_;
 720 }
 721
 722 unsigned int View::minor_tick_count() const
 723 {
 724         return minor_tick_count_;
 725 }
 726
 727 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 728 {
 729         if (tick_period_ != tick_period) {
 730                 tick_period_ = tick_period;
 731                 tick_period_changed();
 732         }
 733 }
 734
 735 TimeUnit View::time_unit() const
 736 {
 737         return time_unit_;
 738 }
 739
 740 void View::set_time_unit(pv::util::TimeUnit time_unit)
 741 {
 742         if (time_unit_ != time_unit) {
 743                 time_unit_ = time_unit;
 744                 time_unit_changed();
 745         }
 746 }
 747
 748 void View::set_current_segment(uint32_t segment_id)
 749 {
 750         current_segment_ = segment_id;
 751
 752         for (const shared_ptr<Signal>& signal : signals_)
 753                 signal->set_current_segment(current_segment_);
 754 #ifdef ENABLE_DECODE
 755         for (shared_ptr<DecodeTrace>& dt : decode_traces_)
 756                 dt->set_current_segment(current_segment_);
 757 #endif
 758
 759         vector<util::Timestamp> triggers = session_.get_triggers(current_segment_);
 760
 761         trigger_markers_.clear();
 762         for (util::Timestamp timestamp : triggers)
 763                 trigger_markers_.push_back(make_shared<TriggerMarker>(*this, timestamp));
 764
 765         if (!custom_zero_offset_set_)
 766                 reset_zero_position();
 767
 768         viewport_->update();
 769
 770         segment_changed(segment_id);
 771 }
 772
 773 bool View::segment_is_selectable() const
 774 {
 775         return segment_selectable_;
 776 }
 777
 778 Trace::SegmentDisplayMode View::segment_display_mode() const
 779 {
 780         return segment_display_mode_;
 781 }
 782
 783 void View::set_segment_display_mode(Trace::SegmentDisplayMode mode)
 784 {
 785         segment_display_mode_ = mode;
 786
 787         for (const shared_ptr<Signal>& signal : signals_)
 788                 signal->set_segment_display_mode(mode);
 789
 790         uint32_t last_segment = session_.get_segment_count() - 1;
 791
 792         switch (mode) {
 793         case Trace::ShowLastSegmentOnly:
 794                 if (current_segment_ != last_segment)
 795                         set_current_segment(last_segment);
 796                 break;
 797
 798         case Trace::ShowLastCompleteSegmentOnly:
 799                 // Do nothing if we only have one segment so far
 800                 if (last_segment > 0) {
 801                         // If the last segment isn't complete, the previous one must be
 802                         uint32_t segment_id =
 803                                 (session_.all_segments_complete(last_segment)) ?
 804                                 last_segment : last_segment - 1;
 805
 806                         if (current_segment_ != segment_id)
 807                                 set_current_segment(segment_id);
 808                 }
 809                 break;
 810
 811         case Trace::ShowSingleSegmentOnly:
 812         case Trace::ShowAllSegments:
 813         case Trace::ShowAccumulatedIntensity:
 814         default:
 815                 // Current segment remains as-is
 816                 break;
 817         }
 818
 819         segment_selectable_ = true;
 820
 821         if ((mode == Trace::ShowAllSegments) || (mode == Trace::ShowAccumulatedIntensity))
 822                 segment_selectable_ = false;
 823
 824         viewport_->update();
 825
 826         segment_display_mode_changed((int)mode, segment_selectable_);
 827 }
 828
 829 void View::zoom(double steps)
 830 {
 831         zoom(steps, viewport_->width() / 2);
 832 }
 833
 834 void View::zoom(double steps, int offset)
 835 {
 836         set_zoom(scale_ * pow(3.0 / 2.0, -steps), offset);
 837 }
 838
 839 void View::zoom_fit(bool gui_state)
 840 {
 841         // Act as one-shot when stopped, toggle along with the GUI otherwise
 842         if (session_.get_capture_state() == Session::Stopped) {
 843                 always_zoom_to_fit_ = false;
 844                 always_zoom_to_fit_changed(false);
 845         } else {
 846                 always_zoom_to_fit_ = gui_state;
 847                 always_zoom_to_fit_changed(gui_state);
 848         }
 849
 850         const pair<Timestamp, Timestamp> extents = get_time_extents();
 851         const Timestamp delta = extents.second - extents.first;
 852         if (delta < Timestamp("1e-12"))
 853                 return;
 854
 855         assert(viewport_);
 856         const int w = viewport_->width();
 857         if (w <= 0)
 858                 return;
 859
 860         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 861         set_scale_offset(scale.convert_to<double>(), extents.first);
 862 }
 863
 864 void View::focus_on_range(uint64_t start_sample, uint64_t end_sample)
 865 {
 866         assert(viewport_);
 867         const int w = viewport_->width();
 868         if (w <= 0)
 869                 return;
 870
 871         const double samplerate = session_.get_samplerate();
 872
 873         const uint64_t sample_delta = (end_sample - start_sample);
 874
 875         // Note: We add 20% margin on the left and 5% on the right
 876         const Timestamp delta = (sample_delta * 1.25) / samplerate;
 877
 878         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 879         const Timestamp offset = (start_sample - sample_delta * 0.20) / samplerate;
 880
 881         set_scale_offset(scale.convert_to<double>(), offset);
 882 }
 883
 884 void View::set_scale_offset(double scale, const Timestamp& offset)
 885 {
 886         // Disable sticky scrolling / always zoom to fit when acquisition runs
 887         // and user drags the viewport
 888         if ((scale_ == scale) && (offset_ != offset) &&
 889                 (session_.get_capture_state() == Session::Running)) {
 890
 891                 if (sticky_scrolling_) {
 892                         sticky_scrolling_ = false;
 893                         sticky_scrolling_changed(false);
 894                 }
 895
 896                 if (always_zoom_to_fit_) {
 897                         always_zoom_to_fit_ = false;
 898                         always_zoom_to_fit_changed(false);
 899                 }
 900         }
 901
 902         set_scale(scale);
 903         set_offset(offset);
 904
 905         calculate_tick_spacing();
 906
 907         update_scroll();
 908         ruler_->update();
 909         viewport_->update();
 910 }
 911
 912 vector< shared_ptr<SignalData> > View::get_visible_data() const
 913 {
 914         // Make a set of all the visible data objects
 915         vector< shared_ptr<SignalData> > visible_data;
 916         for (const shared_ptr<Signal>& sig : signals_)
 917                 if (sig->enabled())
 918                         visible_data.push_back(sig->data());
 919
 920         return visible_data;
 921 }
 922
 923 pair<Timestamp, Timestamp> View::get_time_extents() const
 924 {
 925         boost::optional<Timestamp> left_time, right_time;
 926
 927         vector< shared_ptr<SignalData> > data;
 928         if (signals_.size() == 0)
 929                 return make_pair(0, 0);
 930
 931         data.push_back(signals_.front()->data());
 932
 933         for (const shared_ptr<SignalData>& d : data) {
 934                 const vector< shared_ptr<Segment> > segments = d->segments();
 935                 for (const shared_ptr<Segment>& s : segments) {
 936                         double samplerate = s->samplerate();
 937                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 938
 939                         const Timestamp start_time = s->start_time();
 940                         left_time = left_time ?
 941                                 min(*left_time, start_time) :
 942                                                 start_time;
 943                         right_time = right_time ?
 944                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 945                                                  start_time + d->max_sample_count() / samplerate;
 946                 }
 947         }
 948
 949         if (!left_time || !right_time)
 950                 return make_pair(0, 0);
 951
 952         assert(*left_time <= *right_time);
 953         return make_pair(*left_time, *right_time);
 954 }
 955
 956 bool View::colored_bg() const
 957 {
 958         return colored_bg_;
 959 }
 960
 961 bool View::cursors_shown() const
 962 {
 963         return show_cursors_;
 964 }
 965
 966 void View::show_cursors(bool show)
 967 {
 968         if (show_cursors_ != show) {
 969                 show_cursors_ = show;
 970
 971                 cursor_state_changed(show);
 972                 ruler_->update();
 973                 viewport_->update();
 974         }
 975 }
 976
 977 void View::set_cursors(pv::util::Timestamp& first, pv::util::Timestamp& second)
 978 {
 979         assert(cursors_);
 980
 981         cursors_->first()->set_time(first);
 982         cursors_->second()->set_time(second);
 983
 984         ruler_->update();
 985         viewport_->update();
 986 }
 987
 988 void View::center_cursors()
 989 {
 990         assert(cursors_);
 991
 992         const double time_width = scale_ * viewport_->width();
 993         cursors_->first()->set_time(offset_ + time_width * 0.4);
 994         cursors_->second()->set_time(offset_ + time_width * 0.6);
 995
 996         ruler_->update();
 997         viewport_->update();
 998 }
 999
1000 shared_ptr<CursorPair> View::cursors() const
1001 {
1002         return cursors_;
1003 }
1004
1005 shared_ptr<Flag> View::add_flag(const Timestamp& time)
1006 {
1007         shared_ptr<Flag> flag =
1008                 make_shared<Flag>(*this, time, QString("%1").arg(next_flag_text_));
1009         flags_.push_back(flag);
1010
1011         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
1012                 (next_flag_text_ + 1);
1013
1014         time_item_appearance_changed(true, true);
1015         return flag;
1016 }
1017
1018 void View::remove_flag(shared_ptr<Flag> flag)
1019 {
1020         flags_.remove(flag);
1021         time_item_appearance_changed(true, true);
1022 }
1023
1024 vector< shared_ptr<Flag> > View::flags() const
1025 {
1026         vector< shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
1027         stable_sort(flags.begin(), flags.end(),
1028                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
1029                         return a->time() < b->time();
1030                 });
1031
1032         return flags;
1033 }
1034
1035 const QPoint& View::hover_point() const
1036 {
1037         return hover_point_;
1038 }
1039
1040 const QWidget* View::hover_widget() const
1041 {
1042         return hover_widget_;
1043 }
1044
1045 int64_t View::get_nearest_level_change(const QPoint &p)
1046 {
1047         // Is snapping disabled?
1048         if (snap_distance_ == 0)
1049                 return -1;
1050
1051         struct entry_t {
1052                 entry_t(shared_ptr<Signal> s) :
1053                         signal(s), delta(numeric_limits<int64_t>::max()), sample(-1), is_dense(false) {}
1054                 shared_ptr<Signal> signal;
1055                 int64_t delta;
1056                 int64_t sample;
1057                 bool is_dense;
1058         };
1059
1060         vector<entry_t> list;
1061
1062         // Create list of signals to consider
1063         if (signal_under_mouse_cursor_)
1064                 list.emplace_back(signal_under_mouse_cursor_);
1065         else
1066                 for (shared_ptr<Signal> s : signals_) {
1067                         if (!s->enabled())
1068                                 continue;
1069
1070                         list.emplace_back(s);
1071                 }
1072
1073         // Get data for listed signals
1074         for (entry_t &e : list) {
1075                 // Calculate sample number from cursor position
1076                 const double samples_per_pixel = e.signal->base()->get_samplerate() * scale();
1077                 const int64_t x_offset = offset().convert_to<double>() / scale();
1078                 const int64_t sample_num = max(((x_offset + p.x()) * samples_per_pixel), 0.0);
1079
1080                 vector<data::LogicSegment::EdgePair> edges =
1081                         e.signal->get_nearest_level_changes(sample_num);
1082
1083                 if (edges.empty())
1084                         continue;
1085
1086                 // Check first edge
1087                 const int64_t first_sample_delta = abs(sample_num - edges.front().first);
1088                 const int64_t first_delta = first_sample_delta / samples_per_pixel;
1089                 e.delta = first_delta;
1090                 e.sample = edges.front().first;
1091
1092                 // Check second edge if available
1093                 if (edges.size() == 2) {
1094                         // Note: -1 because this is usually the right edge and sample points are left-aligned
1095                         const int64_t second_sample_delta = abs(sample_num - edges.back().first - 1);
1096                         const int64_t second_delta = second_sample_delta / samples_per_pixel;
1097
1098                         // If both edges are too close, we mark this signal as being dense
1099                         if ((first_delta + second_delta) <= snap_distance_)
1100                                 e.is_dense = true;
1101
1102                         if (second_delta < first_delta) {
1103                                 e.delta = second_delta;
1104                                 e.sample = edges.back().first;
1105                         }
1106                 }
1107         }
1108
1109         // Look for the best match: non-dense first, then dense
1110         entry_t *match = nullptr;
1111
1112         for (entry_t &e : list) {
1113                 if (e.delta > snap_distance_ || e.is_dense)
1114                         continue;
1115
1116                 if (match) {
1117                         if (e.delta < match->delta)
1118                                 match = &e;
1119                 } else
1120                         match = &e;
1121         }
1122
1123         if (!match) {
1124                 for (entry_t &e : list) {
1125                         if (!e.is_dense)
1126                                 continue;
1127
1128                         if (match) {
1129                                 if (e.delta < match->delta)
1130                                         match = &e;
1131                         } else
1132                                 match = &e;
1133                 }
1134         }
1135
1136         if (match) {
1137                 // Somewhat ugly hack to make TimeItem::drag_by() work
1138                 signal_under_mouse_cursor_ = match->signal;
1139
1140                 return match->sample;
1141         }
1142
1143         return -1;
1144 }
1145
1146 void View::restack_all_trace_tree_items()
1147 {
1148         // Make a list of owners that is sorted from deepest first
1149         const vector<shared_ptr<TraceTreeItem>> items(
1150                 list_by_type<TraceTreeItem>());
1151         set< TraceTreeItemOwner* > owners;
1152         for (const auto &r : items)
1153                 owners.insert(r->owner());
1154         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
1155         sort(sorted_owners.begin(), sorted_owners.end(),
1156                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
1157                         return a->depth() > b->depth(); });
1158
1159         // Restack the items recursively
1160         for (auto &o : sorted_owners)
1161                 o->restack_items();
1162
1163         // Animate the items to their destination
1164         for (const auto &i : items)
1165                 i->animate_to_layout_v_offset();
1166 }
1167
1168 int View::header_width() const
1169 {
1170          return header_->extended_size_hint().width();
1171 }
1172
1173 void View::on_setting_changed(const QString &key, const QVariant &value)
1174 {
1175         GlobalSettings settings;
1176
1177         if (key == GlobalSettings::Key_View_ColoredBG) {
1178                 colored_bg_ = settings.value(GlobalSettings::Key_View_ColoredBG).toBool();
1179                 viewport_->update();
1180         }
1181
1182         if ((key == GlobalSettings::Key_View_ShowSamplingPoints) ||
1183            (key == GlobalSettings::Key_View_ShowAnalogMinorGrid))
1184                 viewport_->update();
1185
1186         if (key == GlobalSettings::Key_View_TriggerIsZeroTime)
1187                 on_settingViewTriggerIsZeroTime_changed(value);
1188
1189         if (key == GlobalSettings::Key_View_SnapDistance)
1190                 snap_distance_ = settings.value(GlobalSettings::Key_View_SnapDistance).toInt();
1191 }
1192
1193 void View::trigger_event(int segment_id, util::Timestamp location)
1194 {
1195         // TODO This doesn't work if we're showing multiple segments at once
1196         if ((uint32_t)segment_id != current_segment_)
1197                 return;
1198
1199         if (!custom_zero_offset_set_)
1200                 reset_zero_position();
1201
1202         trigger_markers_.push_back(make_shared<TriggerMarker>(*this, location));
1203 }
1204
1205 void View::get_scroll_layout(double &length, Timestamp &offset) const
1206 {
1207         const pair<Timestamp, Timestamp> extents = get_time_extents();
1208         length = ((extents.second - extents.first) / scale_).convert_to<double>();
1209         offset = offset_ / scale_;
1210 }
1211
1212 void View::set_zoom(double scale, int offset)
1213 {
1214         // Reset the "always zoom to fit" feature as the user changed the zoom
1215         always_zoom_to_fit_ = false;
1216         always_zoom_to_fit_changed(false);
1217
1218         const Timestamp cursor_offset = offset_ + scale_ * offset;
1219         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
1220         const Timestamp new_offset = cursor_offset - new_scale * offset;
1221         set_scale_offset(new_scale.convert_to<double>(), new_offset);
1222 }
1223
1224 void View::calculate_tick_spacing()
1225 {
1226         const double SpacingIncrement = 10.0f;
1227         const double MinValueSpacing = 40.0f;
1228
1229         // Figure out the highest numeric value visible on a label
1230         const QSize areaSize = viewport_->size();
1231         const Timestamp max_time = max(fabs(offset_),
1232                 fabs(offset_ + scale_ * areaSize.width()));
1233
1234         double min_width = SpacingIncrement;
1235         double label_width, tick_period_width;
1236
1237         QFontMetrics m(QApplication::font());
1238
1239         // Copies of the member variables with the same name, used in the calculation
1240         // and written back afterwards, so that we don't emit signals all the time
1241         // during the calculation.
1242         pv::util::Timestamp tick_period = tick_period_;
1243         pv::util::SIPrefix tick_prefix = tick_prefix_;
1244         unsigned tick_precision = tick_precision_;
1245
1246         do {
1247                 const double min_period = scale_ * min_width;
1248
1249                 const int order = (int)floorf(log10f(min_period));
1250                 const pv::util::Timestamp order_decimal =
1251                         pow(pv::util::Timestamp(10), order);
1252
1253                 // Allow for a margin of error so that a scale unit of 1 can be used.
1254                 // Otherwise, for a SU of 1 the tick period will almost always be below
1255                 // the min_period by a small amount - and thus skipped in favor of 2.
1256                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
1257                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
1258                 double tp_with_margin;
1259                 unsigned int unit = 0;
1260
1261                 do {
1262                         tp_with_margin = order_decimal.convert_to<double>() *
1263                                 (ScaleUnits[unit++] + tp_margin);
1264                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
1265
1266                 minor_tick_count_ = (unit == 2) ? 4 : 5;
1267                 tick_period = order_decimal * ScaleUnits[unit - 1];
1268                 tick_prefix = static_cast<pv::util::SIPrefix>(
1269                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
1270
1271                 // Precision is the number of fractional digits required, not
1272                 // taking the prefix into account (and it must never be negative)
1273                 tick_precision = max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
1274
1275                 tick_period_width = (tick_period / scale_).convert_to<double>();
1276
1277                 const QString label_text = Ruler::format_time_with_distance(
1278                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
1279
1280                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
1281                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
1282                                 MinValueSpacing;
1283
1284                 min_width += SpacingIncrement;
1285         } while (tick_period_width < label_width);
1286
1287         set_tick_period(tick_period);
1288         set_tick_prefix(tick_prefix);
1289         set_tick_precision(tick_precision);
1290 }
1291
1292 void View::adjust_top_margin()
1293 {
1294         assert(viewport_);
1295
1296         const QSize areaSize = viewport_->size();
1297
1298         const pair<int, int> extents = v_extents();
1299         const int top_margin = owner_visual_v_offset() + extents.first;
1300         const int trace_bottom = owner_visual_v_offset() + extents.first + extents.second;
1301
1302         // Do we have empty space at the top while the last trace goes out of screen?
1303         if ((top_margin > 0) && (trace_bottom > areaSize.height())) {
1304                 const int trace_height = extents.second - extents.first;
1305
1306                 // Center everything vertically if there is enough space
1307                 if (areaSize.height() >= trace_height)
1308                         set_v_offset(extents.first -
1309                                 ((areaSize.height() - trace_height) / 2));
1310                 else
1311                         // Remove the top margin to make as many traces fit on screen as possible
1312                         set_v_offset(extents.first);
1313         }
1314 }
1315
1316 void View::update_scroll()
1317 {
1318         assert(viewport_);
1319         QScrollBar *hscrollbar = scrollarea_->horizontalScrollBar();
1320         QScrollBar *vscrollbar = scrollarea_->verticalScrollBar();
1321
1322         const QSize areaSize = viewport_->size();
1323
1324         // Set the horizontal scroll bar
1325         double length = 0;
1326         Timestamp offset;
1327         get_scroll_layout(length, offset);
1328         length = max(length - areaSize.width(), 0.0);
1329
1330         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
1331
1332         hscrollbar->setPageStep(areaSize.width() / 2);
1333         hscrollbar->setSingleStep(major_tick_distance);
1334
1335         updating_scroll_ = true;
1336
1337         if (length < MaxScrollValue) {
1338                 hscrollbar->setRange(0, length);
1339                 hscrollbar->setSliderPosition(offset.convert_to<double>());
1340         } else {
1341                 hscrollbar->setRange(0, MaxScrollValue);
1342                 hscrollbar->setSliderPosition(
1343                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
1344         }
1345
1346         updating_scroll_ = false;
1347
1348         // Set the vertical scrollbar
1349         vscrollbar->setPageStep(areaSize.height());
1350         vscrollbar->setSingleStep(areaSize.height() / 8);
1351
1352         const pair<int, int> extents = v_extents();
1353
1354         // Don't change the scrollbar range if there are no traces
1355         if (extents.first != extents.second) {
1356                 int top_margin = ViewScrollMargin;
1357                 int btm_margin = ViewScrollMargin;
1358
1359                 vscrollbar->setRange(extents.first - areaSize.height() + top_margin,
1360                         extents.second - btm_margin);
1361         }
1362
1363         if (scroll_needs_defaults_) {
1364                 set_scroll_default();
1365                 scroll_needs_defaults_ = false;
1366         }
1367 }
1368
1369 void View::reset_scroll()
1370 {
1371         scrollarea_->verticalScrollBar()->setRange(0, 0);
1372 }
1373
1374 void View::set_scroll_default()
1375 {
1376         assert(viewport_);
1377
1378         const QSize areaSize = viewport_->size();
1379
1380         const pair<int, int> extents = v_extents();
1381         const int trace_height = extents.second - extents.first;
1382
1383         // Do all traces fit in the view?
1384         if (areaSize.height() >= trace_height)
1385                 // Center all traces vertically
1386                 set_v_offset(extents.first -
1387                         ((areaSize.height() - trace_height) / 2));
1388         else
1389                 // Put the first trace at the top, letting the bottom ones overflow
1390                 set_v_offset(extents.first);
1391 }
1392
1393 void View::determine_if_header_was_shrunk()
1394 {
1395         const int header_pane_width =
1396                 splitter_->sizes().front();  // clazy:exclude=detaching-temporary
1397
1398         // Allow for a slight margin of error so that we also accept
1399         // slight differences when e.g. a label name change increased
1400         // the overall width
1401         header_was_shrunk_ = (header_pane_width < (header_width() - 10));
1402 }
1403
1404 void View::resize_header_to_fit()
1405 {
1406         // Setting the maximum width of the header widget doesn't work as
1407         // expected because the splitter would allow the user to make the
1408         // pane wider than that, creating empty space as a result.
1409         // To make this work, we stricly enforce the maximum width by
1410         // expanding the header unless the user shrunk it on purpose.
1411         // As we're then setting the width of the header pane, we set the
1412         // splitter to the maximum allowed position.
1413
1414         int splitter_area_width = 0;
1415         for (int w : splitter_->sizes())  // clazy:exclude=range-loop
1416                 splitter_area_width += w;
1417
1418         // Make sure the header has enough horizontal space to show all labels fully
1419         QList<int> pane_sizes;
1420         pane_sizes.push_back(header_->extended_size_hint().width());
1421         pane_sizes.push_back(splitter_area_width - header_->extended_size_hint().width());
1422         splitter_->setSizes(pane_sizes);
1423 }
1424
1425 void View::update_layout()
1426 {
1427         update_scroll();
1428 }
1429
1430 TraceTreeItemOwner* View::find_prevalent_trace_group(
1431         const shared_ptr<sigrok::ChannelGroup> &group,
1432         const map<shared_ptr<data::SignalBase>, shared_ptr<Signal> > &signal_map)
1433 {
1434         assert(group);
1435
1436         set<TraceTreeItemOwner*> owners;
1437         vector<TraceTreeItemOwner*> owner_list;
1438
1439         // Make a set and a list of all the owners
1440         for (const auto& channel : group->channels()) {
1441                 for (auto& entry : signal_map) {
1442                         if (entry.first->channel() == channel) {
1443                                 TraceTreeItemOwner *const o = (entry.second)->owner();
1444                                 owner_list.push_back(o);
1445                                 owners.insert(o);
1446                         }
1447                 }
1448         }
1449
1450         // Iterate through the list of owners, and find the most prevalent
1451         size_t max_prevalence = 0;
1452         TraceTreeItemOwner *prevalent_owner = nullptr;
1453         for (TraceTreeItemOwner *owner : owners) {
1454                 const size_t prevalence = count_if(
1455                         owner_list.begin(), owner_list.end(),
1456                         [&](TraceTreeItemOwner *o) { return o == owner; });
1457                 if (prevalence > max_prevalence) {
1458                         max_prevalence = prevalence;
1459                         prevalent_owner = owner;
1460                 }
1461         }
1462
1463         return prevalent_owner;
1464 }
1465
1466 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
1467         const vector< shared_ptr<sigrok::Channel> > &channels,
1468         const map<shared_ptr<data::SignalBase>, shared_ptr<Signal> > &signal_map,
1469         set< shared_ptr<Trace> > &add_list)
1470 {
1471         vector< shared_ptr<Trace> > filtered_traces;
1472
1473         for (const auto& channel : channels) {
1474                 for (auto& entry : signal_map) {
1475                         if (entry.first->channel() == channel) {
1476                                 shared_ptr<Trace> trace = entry.second;
1477                                 const auto list_iter = add_list.find(trace);
1478                                 if (list_iter == add_list.end())
1479                                         continue;
1480
1481                                 filtered_traces.push_back(trace);
1482                                 add_list.erase(list_iter);
1483                         }
1484                 }
1485         }
1486
1487         return filtered_traces;
1488 }
1489
1490 void View::determine_time_unit()
1491 {
1492         // Check whether we know the sample rate and hence can use time as the unit
1493         if (time_unit_ == util::TimeUnit::Samples) {
1494                 // Check all signals but...
1495                 for (const shared_ptr<Signal>& signal : signals_) {
1496                         const shared_ptr<SignalData> data = signal->data();
1497
1498                         // ...only check first segment of each
1499                         const vector< shared_ptr<Segment> > segments = data->segments();
1500                         if (!segments.empty())
1501                                 if (segments[0]->samplerate()) {
1502                                         set_time_unit(util::TimeUnit::Time);
1503                                         break;
1504                                 }
1505                 }
1506         }
1507 }
1508
1509 bool View::eventFilter(QObject *object, QEvent *event)
1510 {
1511         const QEvent::Type type = event->type();
1512
1513         if (type == QEvent::MouseMove) {
1514
1515                 if (object)
1516                         hover_widget_ = qobject_cast<QWidget*>(object);
1517
1518                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1519                 if (object == viewport_)
1520                         hover_point_ = mouse_event->pos();
1521                 else if (object == ruler_)
1522                         hover_point_ = mouse_event->pos();
1523                 else if (object == header_)
1524                         hover_point_ = QPoint(0, mouse_event->y());
1525                 else
1526                         hover_point_ = QPoint(-1, -1);
1527
1528                 update_hover_point();
1529
1530                 if (grabbed_widget_) {
1531                         int64_t nearest = get_nearest_level_change(hover_point_);
1532                         pv::util::Timestamp mouse_time = offset_ + hover_point_.x() * scale_;
1533
1534                         if (nearest == -1) {
1535                                 grabbed_widget_->set_time(mouse_time);
1536                         } else {
1537                                 grabbed_widget_->set_time(nearest / get_signal_under_mouse_cursor()->base()->get_samplerate());
1538                         }
1539                 }
1540
1541         } else if (type == QEvent::MouseButtonPress) {
1542                 grabbed_widget_ = nullptr;
1543
1544                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
1545                 if ((object == viewport_) && (mouse_event->button() & Qt::LeftButton)) {
1546                         // Send event to all trace tree items
1547                         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1548                                 list_by_type<TraceTreeItem>());
1549                         for (const shared_ptr<TraceTreeItem>& r : trace_tree_items)
1550                                 r->mouse_left_press_event(mouse_event);
1551                 }
1552         } else if (type == QEvent::Leave) {
1553                 hover_point_ = QPoint(-1, -1);
1554                 update_hover_point();
1555         } else if (type == QEvent::Show) {
1556
1557                 // This is somewhat of a hack, unfortunately. We cannot use
1558                 // set_v_offset() from within restore_settings() as the view
1559                 // at that point is neither visible nor properly sized.
1560                 // This is the least intrusive workaround I could come up
1561                 // with: set the vertical offset (or scroll defaults) when
1562                 // the view is shown, which happens after all widgets were
1563                 // resized to their final sizes.
1564                 update_layout();
1565
1566                 if (restoring_state_)
1567                         determine_if_header_was_shrunk();
1568                 else
1569                         resize_header_to_fit();
1570
1571                 if (scroll_needs_defaults_) {
1572                         set_scroll_default();
1573                         scroll_needs_defaults_ = false;
1574                 }
1575
1576                 if (restoring_state_)
1577                         set_v_offset(saved_v_offset_);
1578         }
1579
1580         return QObject::eventFilter(object, event);
1581 }
1582
1583 void View::contextMenuEvent(QContextMenuEvent *event)
1584 {
1585         QPoint pos = event->pos() - QPoint(0, ruler_->sizeHint().height());
1586
1587         const shared_ptr<ViewItem> r = viewport_->get_mouse_over_item(pos);
1588         if (!r)
1589                 return;
1590
1591         QMenu *menu = r->create_view_context_menu(this, pos);
1592         if (menu)
1593                 menu->popup(event->globalPos());
1594 }
1595
1596 void View::resizeEvent(QResizeEvent* event)
1597 {
1598         // Only adjust the top margin if we shrunk vertically
1599         if (event->size().height() < event->oldSize().height())
1600                 adjust_top_margin();
1601
1602         update_layout();
1603 }
1604
1605 void View::update_hover_point()
1606 {
1607         // Determine signal that the mouse cursor is hovering over
1608         signal_under_mouse_cursor_.reset();
1609         if (hover_widget_ == this) {
1610                 for (const shared_ptr<Signal>& s : signals_) {
1611                         const pair<int, int> extents = s->v_extents();
1612                         const int top = s->get_visual_y() + extents.first;
1613                         const int btm = s->get_visual_y() + extents.second;
1614                         if ((hover_point_.y() >= top) && (hover_point_.y() <= btm)
1615                                 && s->base()->enabled())
1616                                 signal_under_mouse_cursor_ = s;
1617                 }
1618         }
1619
1620         // Update all trace tree items
1621         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1622                 list_by_type<TraceTreeItem>());
1623         for (const shared_ptr<TraceTreeItem>& r : trace_tree_items)
1624                 r->hover_point_changed(hover_point_);
1625
1626         // Notify this view's listeners
1627         hover_point_changed(hover_widget_, hover_point_);
1628
1629         // Hover point is -1 when invalid and 0 for the header
1630         if (hover_point_.x() > 0) {
1631                 // Notify global listeners
1632                 pv::util::Timestamp mouse_time = offset_ + hover_point_.x() * scale_;
1633                 int64_t sample_num = (mouse_time * session_.get_samplerate()).convert_to<int64_t>();
1634
1635                 MetadataObject* md_obj =
1636                         session_.metadata_obj_manager()->find_object_by_type(MetadataObjMousePos);
1637                 md_obj->set_value(MetadataValueStartSample, QVariant((qlonglong)sample_num));
1638         }
1639 }
1640
1641 void View::row_item_appearance_changed(bool label, bool content)
1642 {
1643         if (label)
1644                 header_->update();
1645         if (content)
1646                 viewport_->update();
1647 }
1648
1649 void View::time_item_appearance_changed(bool label, bool content)
1650 {
1651         if (label) {
1652                 ruler_->update();
1653
1654                 // Make sure the header pane width is updated, too
1655                 update_layout();
1656         }
1657
1658         if (content)
1659                 viewport_->update();
1660 }
1661
1662 void View::extents_changed(bool horz, bool vert)
1663 {
1664         sticky_events_ |=
1665                 (horz ? TraceTreeItemHExtentsChanged : 0) |
1666                 (vert ? TraceTreeItemVExtentsChanged : 0);
1667
1668         if (!lazy_event_handler_.isActive())
1669                 lazy_event_handler_.start();
1670 }
1671
1672 void View::on_signal_name_changed()
1673 {
1674         if (!header_was_shrunk_)
1675                 resize_header_to_fit();
1676 }
1677
1678 void View::on_splitter_moved()
1679 {
1680         // The header can only shrink when the splitter is moved manually
1681         determine_if_header_was_shrunk();
1682
1683         if (!header_was_shrunk_)
1684                 resize_header_to_fit();
1685 }
1686
1687 void View::on_zoom_in_shortcut_triggered()
1688 {
1689         zoom(1);
1690 }
1691
1692 void View::on_zoom_out_shortcut_triggered()
1693 {
1694         zoom(-1);
1695 }
1696
1697 void View::on_scroll_to_start_shortcut_triggered()
1698 {
1699         set_h_offset(0);
1700 }
1701
1702 void View::on_scroll_to_end_shortcut_triggered()
1703 {
1704         set_h_offset(get_h_scrollbar_maximum());
1705 }
1706
1707 void View::h_scroll_value_changed(int value)
1708 {
1709         if (updating_scroll_)
1710                 return;
1711
1712         // Disable sticky scrolling when user moves the horizontal scroll bar
1713         // during a running acquisition
1714         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
1715                 sticky_scrolling_ = false;
1716                 sticky_scrolling_changed(false);
1717         }
1718
1719         const int range = scrollarea_->horizontalScrollBar()->maximum();
1720         if (range < MaxScrollValue)
1721                 set_offset(scale_ * value);
1722         else {
1723                 double length = 0;
1724                 Timestamp offset;
1725                 get_scroll_layout(length, offset);
1726                 set_offset(scale_ * length * value / MaxScrollValue);
1727         }
1728
1729         ruler_->update();
1730         viewport_->update();
1731 }
1732
1733 void View::v_scroll_value_changed()
1734 {
1735         header_->update();
1736         viewport_->update();
1737 }
1738
1739 void View::on_grab_ruler(int ruler_id)
1740 {
1741         if (!cursors_shown()) {
1742                 center_cursors();
1743                 show_cursors();
1744         }
1745
1746         // Release the grabbed widget if its trigger hotkey was pressed twice
1747         if (ruler_id == 1)
1748                 grabbed_widget_ = (grabbed_widget_ == cursors_->first().get()) ?
1749                         nullptr : cursors_->first().get();
1750         else
1751                 grabbed_widget_ = (grabbed_widget_ == cursors_->second().get()) ?
1752                         nullptr : cursors_->second().get();
1753
1754         if (grabbed_widget_)
1755                 grabbed_widget_->set_time(ruler_->get_absolute_time_from_x_pos(
1756                         mapFromGlobal(QCursor::pos()).x() - header_width()));
1757 }
1758
1759 void View::signals_changed()
1760 {
1761         using sigrok::Channel;
1762
1763         lock_guard<mutex> lock(signal_mutex_);
1764
1765         vector< shared_ptr<Channel> > channels;
1766         shared_ptr<sigrok::Device> sr_dev;
1767         bool signals_added_or_removed = false;
1768
1769         // Do we need to set the vertical scrollbar to its default position later?
1770         // We do if there are no traces, i.e. the scroll bar has no range set
1771         bool reset_scrollbar =
1772                 (scrollarea_->verticalScrollBar()->minimum() ==
1773                         scrollarea_->verticalScrollBar()->maximum());
1774
1775         if (!session_.device()) {
1776                 reset_scroll();
1777                 signals_.clear();
1778         } else {
1779                 sr_dev = session_.device()->device();
1780                 assert(sr_dev);
1781                 channels = sr_dev->channels();
1782         }
1783
1784         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
1785
1786         // Make a list of traces that are being added, and a list of traces
1787         // that are being removed. The set_difference() algorithms require
1788         // both sets to be in the exact same order, which means that PD signals
1789         // must always be last as they interrupt the sort order otherwise
1790         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
1791         const set<shared_ptr<Trace>> prev_traces(
1792                 prev_trace_list.begin(), prev_trace_list.end());
1793
1794         set< shared_ptr<Trace> > traces(signals_.begin(), signals_.end());
1795
1796 #ifdef ENABLE_DECODE
1797         traces.insert(decode_traces_.begin(), decode_traces_.end());
1798 #endif
1799         set< shared_ptr<Trace> > add_traces;
1800         set_difference(traces.begin(), traces.end(),
1801                 prev_traces.begin(), prev_traces.end(),
1802                 inserter(add_traces, add_traces.begin()));
1803
1804         set< shared_ptr<Trace> > remove_traces;
1805         set_difference(prev_traces.begin(), prev_traces.end(),
1806                 traces.begin(), traces.end(),
1807                 inserter(remove_traces, remove_traces.begin()));
1808
1809         // Make a look-up table of sigrok Channels to pulseview Signals
1810         map<shared_ptr<data::SignalBase>, shared_ptr<Signal> > signal_map;
1811         for (const shared_ptr<Signal>& sig : signals_)
1812                 signal_map[sig->base()] = sig;
1813
1814         // Populate channel groups
1815         if (sr_dev)
1816                 for (auto& entry : sr_dev->channel_groups()) {
1817                         const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
1818
1819                         if (group->channels().size() <= 1)
1820                                 continue;
1821
1822                         // Find best trace group to add to
1823                         TraceTreeItemOwner *owner = find_prevalent_trace_group(
1824                                 group, signal_map);
1825
1826                         // If there is no trace group, create one
1827                         shared_ptr<TraceGroup> new_trace_group;
1828                         if (!owner) {
1829                                 new_trace_group.reset(new TraceGroup());
1830                                 owner = new_trace_group.get();
1831                         }
1832
1833                         // Extract traces for the trace group, removing them from
1834                         // the add list
1835                         const vector< shared_ptr<Trace> > new_traces_in_group =
1836                                 extract_new_traces_for_channels(group->channels(),
1837                                         signal_map, add_traces);
1838
1839                         // Add the traces to the group
1840                         const pair<int, int> prev_v_extents = owner->v_extents();
1841                         int offset = prev_v_extents.second - prev_v_extents.first;
1842                         for (const shared_ptr<Trace>& trace : new_traces_in_group) {
1843                                 assert(trace);
1844                                 owner->add_child_item(trace);
1845
1846                                 const pair<int, int> extents = trace->v_extents();
1847                                 if (trace->enabled())
1848                                         offset += -extents.first;
1849                                 trace->force_to_v_offset(offset);
1850                                 if (trace->enabled())
1851                                         offset += extents.second;
1852                         }
1853
1854                         if (new_trace_group) {
1855                                 // Assign proper vertical offsets to each channel in the group
1856                                 new_trace_group->restack_items();
1857
1858                                 // If this is a new group, enqueue it in the new top level
1859                                 // items list
1860                                 if (!new_traces_in_group.empty())
1861                                         new_top_level_items.push_back(new_trace_group);
1862                         }
1863                 }
1864
1865         // Enqueue the remaining logic channels in a group
1866         vector< shared_ptr<Channel> > logic_channels;
1867         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
1868                 [](const shared_ptr<Channel>& c) {
1869                         return c->type() == sigrok::ChannelType::LOGIC; });
1870
1871         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
1872                 extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
1873
1874         if (non_grouped_logic_signals.size() > 0) {
1875                 const shared_ptr<TraceGroup> non_grouped_trace_group(
1876                         make_shared<TraceGroup>());
1877                 for (const shared_ptr<Trace>& trace : non_grouped_logic_signals)
1878                         non_grouped_trace_group->add_child_item(trace);
1879
1880                 non_grouped_trace_group->restack_items();
1881                 new_top_level_items.push_back(non_grouped_trace_group);
1882         }
1883
1884         // Enqueue the remaining channels as free ungrouped traces
1885         const vector< shared_ptr<Trace> > new_top_level_signals =
1886                 extract_new_traces_for_channels(channels, signal_map, add_traces);
1887         new_top_level_items.insert(new_top_level_items.end(),
1888                 new_top_level_signals.begin(), new_top_level_signals.end());
1889
1890         // Enqueue any remaining traces i.e. decode traces
1891         new_top_level_items.insert(new_top_level_items.end(),
1892                 add_traces.begin(), add_traces.end());
1893
1894         // Remove any removed traces
1895         for (const shared_ptr<Trace>& trace : remove_traces) {
1896                 TraceTreeItemOwner *const owner = trace->owner();
1897                 assert(owner);
1898                 owner->remove_child_item(trace);
1899                 signals_added_or_removed = true;
1900         }
1901
1902         // Remove any empty trace groups
1903         for (shared_ptr<TraceGroup> group : list_by_type<TraceGroup>())
1904                 if (group->child_items().size() == 0) {
1905                         remove_child_item(group);
1906                         group.reset();
1907                 }
1908
1909         // Add and position the pending top levels items
1910         int offset = v_extents().second;
1911         for (shared_ptr<TraceTreeItem> item : new_top_level_items) {
1912                 // items may already have gained an owner when they were added to a group above
1913                 if (item->owner())
1914                         continue;
1915
1916                 add_child_item(item);
1917
1918                 // Position the item after the last item or at the top if there is none
1919                 const pair<int, int> extents = item->v_extents();
1920
1921                 if (item->enabled())
1922                         offset += -extents.first;
1923
1924                 item->force_to_v_offset(offset);
1925
1926                 if (item->enabled())
1927                         offset += extents.second;
1928                 signals_added_or_removed = true;
1929         }
1930
1931
1932         if (signals_added_or_removed && !header_was_shrunk_)
1933                 resize_header_to_fit();
1934
1935         update_layout();
1936
1937         header_->update();
1938         viewport_->update();
1939
1940         if (reset_scrollbar)
1941                 set_scroll_default();
1942 }
1943
1944 void View::capture_state_updated(int state)
1945 {
1946         GlobalSettings settings;
1947
1948         if (state == Session::Running) {
1949                 set_time_unit(util::TimeUnit::Samples);
1950
1951                 trigger_markers_.clear();
1952                 if (!custom_zero_offset_set_)
1953                         set_zero_position(0);
1954
1955                 scale_at_acq_start_ = scale_;
1956                 offset_at_acq_start_ = offset_;
1957
1958                 // Activate "always zoom to fit" if the setting is enabled and we're
1959                 // the main view of this session (other trace views may be used for
1960                 // zooming and we don't want to mess them up)
1961                 bool state = settings.value(GlobalSettings::Key_View_ZoomToFitDuringAcq).toBool();
1962                 if (is_main_view_ && state && !restoring_state_) {
1963                         always_zoom_to_fit_ = true;
1964                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1965                 }
1966
1967                 // Enable sticky scrolling if the setting is enabled
1968                 sticky_scrolling_ = !restoring_state_ &&
1969                         settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
1970
1971                 // Reset all traces to segment 0
1972                 current_segment_ = 0;
1973                 set_current_segment(current_segment_);
1974         }
1975
1976         if (state == Session::Stopped) {
1977                 // After acquisition has stopped we need to re-calculate the ticks once
1978                 // as it's otherwise done when the user pans or zooms, which is too late
1979                 calculate_tick_spacing();
1980
1981                 // Reset "always zoom to fit", the acquisition has stopped
1982                 if (always_zoom_to_fit_) {
1983                         // Perform a final zoom-to-fit before disabling
1984                         zoom_fit(always_zoom_to_fit_);
1985                         always_zoom_to_fit_ = false;
1986                         always_zoom_to_fit_changed(always_zoom_to_fit_);
1987                 }
1988
1989                 bool zoom_to_fit_after_acq =
1990                         settings.value(GlobalSettings::Key_View_ZoomToFitAfterAcq).toBool();
1991
1992                 // Only perform zoom-to-fit if the user hasn't altered the viewport and
1993                 // we didn't restore settings in the meanwhile
1994                 if (zoom_to_fit_after_acq &&
1995                         !restoring_state_ &&
1996                         (scale_ == scale_at_acq_start_) &&
1997                         (sticky_scrolling_ || (offset_ == offset_at_acq_start_))) {
1998                         zoom_fit(false);  // We're stopped, so the GUI state doesn't matter
1999                 }
2000
2001                 restoring_state_ = false;
2002         }
2003 }
2004
2005 void View::on_new_segment(int new_segment_id)
2006 {
2007         on_segment_changed(new_segment_id);
2008 }
2009
2010 void View::on_segment_completed(int segment_id)
2011 {
2012         on_segment_changed(segment_id);
2013 }
2014
2015 void View::on_segment_changed(int segment)
2016 {
2017         switch (segment_display_mode_) {
2018         case Trace::ShowLastSegmentOnly:
2019         case Trace::ShowSingleSegmentOnly:
2020                 set_current_segment(segment);
2021                 break;
2022
2023         case Trace::ShowLastCompleteSegmentOnly:
2024                 // Only update if all segments are complete
2025                 if (session_.all_segments_complete(segment))
2026                         set_current_segment(segment);
2027                 break;
2028
2029         case Trace::ShowAllSegments:
2030         case Trace::ShowAccumulatedIntensity:
2031         default:
2032                 break;
2033         }
2034 }
2035
2036 void View::on_settingViewTriggerIsZeroTime_changed(const QVariant new_value)
2037 {
2038         (void)new_value;
2039
2040         if (!custom_zero_offset_set_)
2041                 reset_zero_position();
2042 }
2043
2044 void View::perform_delayed_view_update()
2045 {
2046         if (always_zoom_to_fit_) {
2047                 zoom_fit(true);
2048         } else if (sticky_scrolling_) {
2049                 // Make right side of the view sticky
2050                 double length = 0;
2051                 Timestamp offset;
2052                 get_scroll_layout(length, offset);
2053
2054                 const QSize areaSize = viewport_->size();
2055                 length = max(length - areaSize.width(), 0.0);
2056
2057                 set_offset(scale_ * length);
2058         }
2059
2060         determine_time_unit();
2061         update_scroll();
2062         ruler_->update();
2063         viewport_->update();
2064 }
2065
2066 void View::process_sticky_events()
2067 {
2068         if (sticky_events_ & TraceTreeItemHExtentsChanged)
2069                 update_layout();
2070         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
2071                 restack_all_trace_tree_items();
2072                 update_scroll();
2073         }
2074
2075         // Clear the sticky events
2076         sticky_events_ = 0;
2077 }
2078
2079 } // namespace trace
2080 } // namespace views
2081 } // namespace pv