pv/view/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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #ifdef ENABLE_DECODE
  22 #include <libsigrokdecode/libsigrokdecode.h>
  23 #endif
  24
  25 #include <extdef.h>
  26
  27 #include <algorithm>
  28 #include <cassert>
  29 #include <climits>
  30 #include <cmath>
  31 #include <iterator>
  32 #include <mutex>
  33 #include <unordered_set>
  34
  35 #include <QApplication>
  36 #include <QEvent>
  37 #include <QFontMetrics>
  38 #include <QMouseEvent>
  39 #include <QScrollBar>
  40
  41 #include <libsigrokcxx/libsigrokcxx.hpp>
  42
  43 #include "decodetrace.hpp"
  44 #include "header.hpp"
  45 #include "logicsignal.hpp"
  46 #include "ruler.hpp"
  47 #include "signal.hpp"
  48 #include "tracegroup.hpp"
  49 #include "view.hpp"
  50 #include "viewport.hpp"
  51
  52 #include "pv/session.hpp"
  53 #include "pv/devices/device.hpp"
  54 #include "pv/data/logic.hpp"
  55 #include "pv/data/logicsegment.hpp"
  56 #include "pv/util.hpp"
  57
  58 using boost::shared_lock;
  59 using boost::shared_mutex;
  60
  61 using pv::data::SignalData;
  62 using pv::data::Segment;
  63 using pv::util::format_time;
  64 using pv::util::TimeUnit;
  65
  66 using std::deque;
  67 using std::dynamic_pointer_cast;
  68 using std::inserter;
  69 using std::list;
  70 using std::lock_guard;
  71 using std::max;
  72 using std::make_pair;
  73 using std::min;
  74 using std::pair;
  75 using std::set;
  76 using std::set_difference;
  77 using std::shared_ptr;
  78 using std::unordered_map;
  79 using std::unordered_set;
  80 using std::vector;
  81 using std::weak_ptr;
  82
  83 namespace pv {
  84 namespace view {
  85
  86 const double View::MaxScale = 1e9;
  87 const double View::MinScale = 1e-15;
  88
  89 const int View::MaxScrollValue = INT_MAX / 2;
  90 const int View::MaxViewAutoUpdateRate = 25; // No more than 25 Hz with sticky scrolling
  91
  92 const int View::ScaleUnits[3] = {1, 2, 5};
  93
  94 View::View(Session &session, QWidget *parent) :
  95         QAbstractScrollArea(parent),
  96         session_(session),
  97         viewport_(new Viewport(*this)),
  98         ruler_(new Ruler(*this)),
  99         header_(new Header(*this)),
 100         scale_(1e-3),
 101         offset_(0),
 102         updating_scroll_(false),
 103         sticky_scrolling_(false), // Default setting is set in MainWindow::setup_ui()
 104         always_zoom_to_fit_(false),
 105         tick_period_(0.0),
 106         tick_prefix_(0),
 107         tick_precision_(0),
 108         time_unit_(util::Time),
 109         show_cursors_(false),
 110         cursors_(new CursorPair(*this)),
 111         next_flag_text_('A'),
 112         hover_point_(-1, -1)
 113 {
 114         connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
 115                 this, SLOT(h_scroll_value_changed(int)));
 116         connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 117                 this, SLOT(v_scroll_value_changed()));
 118
 119         connect(&session_, SIGNAL(signals_changed()),
 120                 this, SLOT(signals_changed()));
 121         connect(&session_, SIGNAL(capture_state_changed(int)),
 122                 this, SLOT(capture_state_updated(int)));
 123         connect(&session_, SIGNAL(data_received()),
 124                 this, SLOT(data_updated()));
 125         connect(&session_, SIGNAL(frame_ended()),
 126                 this, SLOT(data_updated()));
 127
 128         connect(header_, SIGNAL(selection_changed()),
 129                 ruler_, SLOT(clear_selection()));
 130         connect(ruler_, SIGNAL(selection_changed()),
 131                 header_, SLOT(clear_selection()));
 132
 133         connect(header_, SIGNAL(selection_changed()),
 134                 this, SIGNAL(selection_changed()));
 135         connect(ruler_, SIGNAL(selection_changed()),
 136                 this, SIGNAL(selection_changed()));
 137
 138         connect(this, SIGNAL(hover_point_changed()),
 139                 this, SLOT(on_hover_point_changed()));
 140
 141         connect(&lazy_event_handler_, SIGNAL(timeout()),
 142                 this, SLOT(process_sticky_events()));
 143         lazy_event_handler_.setSingleShot(true);
 144
 145         connect(&delayed_view_updater_, SIGNAL(timeout()),
 146                 this, SLOT(perform_delayed_view_update()));
 147         delayed_view_updater_.setSingleShot(true);
 148         delayed_view_updater_.setInterval(1000 / MaxViewAutoUpdateRate);
 149
 150         setViewport(viewport_);
 151
 152         viewport_->installEventFilter(this);
 153         ruler_->installEventFilter(this);
 154         header_->installEventFilter(this);
 155
 156         // Trigger the initial event manually. The default device has signals
 157         // which were created before this object came into being
 158         signals_changed();
 159
 160         // make sure the transparent widgets are on the top
 161         ruler_->raise();
 162         header_->raise();
 163
 164         // Update the zoom state
 165         calculate_tick_spacing();
 166 }
 167
 168 Session& View::session()
 169 {
 170         return session_;
 171 }
 172
 173 const Session& View::session() const
 174 {
 175         return session_;
 176 }
 177
 178 View* View::view()
 179 {
 180         return this;
 181 }
 182
 183 const View* View::view() const
 184 {
 185         return this;
 186 }
 187
 188 Viewport* View::viewport()
 189 {
 190         return viewport_;
 191 }
 192
 193 const Viewport* View::viewport() const
 194 {
 195         return viewport_;
 196 }
 197
 198 vector< shared_ptr<TimeItem> > View::time_items() const
 199 {
 200         const vector<shared_ptr<Flag>> f(flags());
 201         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 202         items.push_back(cursors_);
 203         items.push_back(cursors_->first());
 204         items.push_back(cursors_->second());
 205         return items;
 206 }
 207
 208 double View::scale() const
 209 {
 210         return scale_;
 211 }
 212
 213 double View::offset() const
 214 {
 215         return offset_;
 216 }
 217
 218 int View::owner_visual_v_offset() const
 219 {
 220         return -verticalScrollBar()->sliderPosition();
 221 }
 222
 223 void View::set_v_offset(int offset)
 224 {
 225         verticalScrollBar()->setSliderPosition(offset);
 226         header_->update();
 227         viewport_->update();
 228 }
 229
 230 unsigned int View::depth() const
 231 {
 232         return 0;
 233 }
 234
 235 unsigned int View::tick_prefix() const
 236 {
 237         return tick_prefix_;
 238 }
 239
 240 unsigned int View::tick_precision() const
 241 {
 242         return tick_precision_;
 243 }
 244
 245 double View::tick_period() const
 246 {
 247         return tick_period_;
 248 }
 249
 250 TimeUnit View::time_unit() const
 251 {
 252         return time_unit_;
 253 }
 254
 255 void View::zoom(double steps)
 256 {
 257         zoom(steps, viewport_->width() / 2);
 258 }
 259
 260 void View::zoom(double steps, int offset)
 261 {
 262         set_zoom(scale_ * pow(3.0/2.0, -steps), offset);
 263 }
 264
 265 void View::zoom_fit(bool gui_state)
 266 {
 267         // Act as one-shot when stopped, toggle along with the GUI otherwise
 268         if (session_.get_capture_state() == Session::Stopped) {
 269                 always_zoom_to_fit_ = false;
 270                 always_zoom_to_fit_changed(false);
 271         } else {
 272                 always_zoom_to_fit_ = gui_state;
 273                 always_zoom_to_fit_changed(gui_state);
 274         }
 275
 276         const pair<double, double> extents = get_time_extents();
 277         const double delta = extents.second - extents.first;
 278         if (delta < 1e-12)
 279                 return;
 280
 281         assert(viewport_);
 282         const int w = viewport_->width();
 283         if (w <= 0)
 284                 return;
 285
 286         const double scale = max(min(delta / w, MaxScale), MinScale);
 287         set_scale_offset(scale, extents.first);
 288 }
 289
 290 void View::zoom_one_to_one()
 291 {
 292         using pv::data::SignalData;
 293
 294         // Make a set of all the visible data objects
 295         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 296         if (visible_data.empty())
 297                 return;
 298
 299         double samplerate = 0.0;
 300         for (const shared_ptr<SignalData> d : visible_data) {
 301                 assert(d);
 302                 const vector< shared_ptr<Segment> > segments =
 303                         d->segments();
 304                 for (const shared_ptr<Segment> &s : segments)
 305                         samplerate = max(samplerate, s->samplerate());
 306         }
 307
 308         if (samplerate == 0.0)
 309                 return;
 310
 311         assert(viewport_);
 312         const int w = viewport_->width();
 313         if (w <= 0)
 314                 return;
 315
 316         set_zoom(1.0 / samplerate, w / 2);
 317 }
 318
 319 void View::set_scale_offset(double scale, double offset)
 320 {
 321         // Disable sticky scrolling / always zoom to fit when acquisition runs
 322         // and user drags the viewport
 323         if ((scale_ == scale) && (offset_ != offset) &&
 324                         (session_.get_capture_state() == Session::Running)) {
 325
 326                 if (sticky_scrolling_) {
 327                         sticky_scrolling_ = false;
 328                         sticky_scrolling_changed(false);
 329                 }
 330
 331                 if (always_zoom_to_fit_) {
 332                         always_zoom_to_fit_ = false;
 333                         always_zoom_to_fit_changed(false);
 334                 }
 335         }
 336
 337         scale_ = scale;
 338         offset_ = offset;
 339
 340         calculate_tick_spacing();
 341
 342         update_scroll();
 343         ruler_->update();
 344         viewport_->update();
 345         scale_offset_changed();
 346 }
 347
 348 set< shared_ptr<SignalData> > View::get_visible_data() const
 349 {
 350         shared_lock<shared_mutex> lock(session().signals_mutex());
 351         const unordered_set< shared_ptr<Signal> > &sigs(session().signals());
 352
 353         // Make a set of all the visible data objects
 354         set< shared_ptr<SignalData> > visible_data;
 355         for (const shared_ptr<Signal> sig : sigs)
 356                 if (sig->enabled())
 357                         visible_data.insert(sig->data());
 358
 359         return visible_data;
 360 }
 361
 362 pair<double, double> View::get_time_extents() const
 363 {
 364         double left_time = DBL_MAX, right_time = DBL_MIN;
 365         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 366         for (const shared_ptr<SignalData> d : visible_data)
 367         {
 368                 const vector< shared_ptr<Segment> > segments =
 369                         d->segments();
 370                 for (const shared_ptr<Segment> &s : segments) {
 371                         double samplerate = s->samplerate();
 372                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 373
 374                         const double start_time = s->start_time();
 375                         left_time = min(left_time, start_time);
 376                         right_time = max(right_time, start_time +
 377                                 d->max_sample_count() / samplerate);
 378                 }
 379         }
 380
 381         if (left_time == DBL_MAX && right_time == DBL_MIN)
 382                 return make_pair(0.0, 0.0);
 383
 384         assert(left_time < right_time);
 385         return make_pair(left_time, right_time);
 386 }
 387
 388 void View::enable_sticky_scrolling(bool state)
 389 {
 390         sticky_scrolling_ = state;
 391 }
 392
 393 bool View::cursors_shown() const
 394 {
 395         return show_cursors_;
 396 }
 397
 398 void View::show_cursors(bool show)
 399 {
 400         show_cursors_ = show;
 401         ruler_->update();
 402         viewport_->update();
 403 }
 404
 405 void View::centre_cursors()
 406 {
 407         const double time_width = scale_ * viewport_->width();
 408         cursors_->first()->set_time(offset_ + time_width * 0.4);
 409         cursors_->second()->set_time(offset_ + time_width * 0.6);
 410         ruler_->update();
 411         viewport_->update();
 412 }
 413
 414 std::shared_ptr<CursorPair> View::cursors() const
 415 {
 416         return cursors_;
 417 }
 418
 419 void View::add_flag(double time)
 420 {
 421         flags_.push_back(shared_ptr<Flag>(new Flag(*this, time,
 422                 QString("%1").arg(next_flag_text_))));
 423         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 424                 (next_flag_text_ + 1);
 425         time_item_appearance_changed(true, true);
 426 }
 427
 428 void View::remove_flag(std::shared_ptr<Flag> flag)
 429 {
 430         flags_.remove(flag);
 431         time_item_appearance_changed(true, true);
 432 }
 433
 434 vector< std::shared_ptr<Flag> > View::flags() const
 435 {
 436         vector< std::shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 437         stable_sort(flags.begin(), flags.end(),
 438                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 439                         return a->time() < b->time();
 440                 });
 441
 442         return flags;
 443 }
 444
 445 const QPoint& View::hover_point() const
 446 {
 447         return hover_point_;
 448 }
 449
 450 void View::update_viewport()
 451 {
 452         assert(viewport_);
 453         viewport_->update();
 454         header_->update();
 455 }
 456
 457 void View::restack_all_row_items()
 458 {
 459         // Make a list of owners that is sorted from deepest first
 460         const auto owners = list_row_item_owners();
 461         vector< RowItemOwner* > sorted_owners(owners.begin(), owners.end());
 462         sort(sorted_owners.begin(), sorted_owners.end(),
 463                 [](const RowItemOwner* a, const RowItemOwner *b) {
 464                         return a->depth() > b->depth(); });
 465
 466         // Restack the items recursively
 467         for (auto &o : sorted_owners)
 468                 o->restack_items();
 469
 470         // Animate the items to their destination
 471         for (const auto &r : *this)
 472                 r->animate_to_layout_v_offset();
 473 }
 474
 475 void View::get_scroll_layout(double &length, double &offset) const
 476 {
 477         const pair<double, double> extents = get_time_extents();
 478         length = (extents.second - extents.first) / scale_;
 479         offset = offset_ / scale_;
 480 }
 481
 482 void View::set_zoom(double scale, int offset)
 483 {
 484         // Reset the "always zoom to fit" feature as the user changed the zoom
 485         always_zoom_to_fit_ = false;
 486         always_zoom_to_fit_changed(false);
 487
 488         const double cursor_offset = offset_ + scale_ * offset;
 489         const double new_scale = max(min(scale, MaxScale), MinScale);
 490         const double new_offset = cursor_offset - new_scale * offset;
 491         set_scale_offset(new_scale, new_offset);
 492 }
 493
 494 void View::calculate_tick_spacing()
 495 {
 496         const double SpacingIncrement = 32.0f;
 497         const double MinValueSpacing = 32.0f;
 498
 499         double min_width = SpacingIncrement;
 500         double label_width, tick_period_width;
 501
 502         QFontMetrics m(QApplication::font());
 503
 504         do {
 505                 const double min_period = scale_ * min_width;
 506
 507                 const int order = (int)floorf(log10f(min_period));
 508                 const double order_decimal = pow(10.0, order);
 509
 510                 unsigned int unit = 0;
 511
 512                 do {
 513                         tick_period_ = order_decimal * ScaleUnits[unit++];
 514                 } while (tick_period_ < min_period &&
 515                         unit < countof(ScaleUnits));
 516
 517                 tick_prefix_ = (order - pv::util::FirstSIPrefixPower) / 3;
 518
 519                 // Precision is the number of fractional digits required, not
 520                 // taking the prefix into account (and it must never be negative)
 521                 tick_precision_ = std::max((int)ceil(log10f(1 / tick_period_)), 0);
 522
 523                 tick_period_width = tick_period_ / scale_;
 524
 525                 const QString label_text =
 526                         format_time(offset_, tick_prefix_, time_unit_, tick_precision_);
 527
 528                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 529                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 530                                 MinValueSpacing;
 531
 532                 min_width += SpacingIncrement;
 533
 534         } while (tick_period_width < label_width);
 535 }
 536
 537 void View::update_scroll()
 538 {
 539         assert(viewport_);
 540
 541         const QSize areaSize = viewport_->size();
 542
 543         // Set the horizontal scroll bar
 544         double length = 0, offset = 0;
 545         get_scroll_layout(length, offset);
 546         length = max(length - areaSize.width(), 0.0);
 547
 548         int major_tick_distance = tick_period_ / scale_;
 549
 550         horizontalScrollBar()->setPageStep(areaSize.width() / 2);
 551         horizontalScrollBar()->setSingleStep(major_tick_distance);
 552
 553         updating_scroll_ = true;
 554
 555         if (length < MaxScrollValue) {
 556                 horizontalScrollBar()->setRange(0, length);
 557                 horizontalScrollBar()->setSliderPosition(offset);
 558         } else {
 559                 horizontalScrollBar()->setRange(0, MaxScrollValue);
 560                 horizontalScrollBar()->setSliderPosition(
 561                         offset_ * MaxScrollValue / (scale_ * length));
 562         }
 563
 564         updating_scroll_ = false;
 565
 566         // Set the vertical scrollbar
 567         verticalScrollBar()->setPageStep(areaSize.height());
 568         verticalScrollBar()->setSingleStep(areaSize.height() / 8);
 569
 570         const pair<int, int> extents = v_extents();
 571         verticalScrollBar()->setRange(extents.first - (areaSize.height() / 2),
 572                 extents.second - (areaSize.height() / 2));
 573 }
 574
 575 void View::update_layout()
 576 {
 577         setViewportMargins(
 578                 header_->sizeHint().width() - pv::view::Header::BaselineOffset,
 579                 ruler_->sizeHint().height(), 0, 0);
 580         ruler_->setGeometry(viewport_->x(), 0,
 581                 viewport_->width(), ruler_->extended_size_hint().height());
 582         header_->setGeometry(0, viewport_->y(),
 583                 header_->extended_size_hint().width(), viewport_->height());
 584         update_scroll();
 585 }
 586
 587 void View::paint_label(QPainter &p, const QRect &rect, bool hover)
 588 {
 589         (void)p;
 590         (void)rect;
 591         (void)hover;
 592 }
 593
 594 QRectF View::label_rect(const QRectF &rect)
 595 {
 596         (void)rect;
 597         return QRectF();
 598 }
 599
 600 RowItemOwner* View::find_prevalent_trace_group(
 601         const shared_ptr<sigrok::ChannelGroup> &group,
 602         const unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 603                 &signal_map)
 604 {
 605         assert(group);
 606
 607         unordered_set<RowItemOwner*> owners;
 608         vector<RowItemOwner*> owner_list;
 609
 610         // Make a set and a list of all the owners
 611         for (const auto &channel : group->channels()) {
 612                 const auto iter = signal_map.find(channel);
 613                 if (iter == signal_map.end())
 614                         continue;
 615
 616                 RowItemOwner *const o = (*iter).second->owner();
 617                 owner_list.push_back(o);
 618                 owners.insert(o);
 619         }
 620
 621         // Iterate through the list of owners, and find the most prevalent
 622         size_t max_prevalence = 0;
 623         RowItemOwner *prevalent_owner = nullptr;
 624         for (RowItemOwner *owner : owners) {
 625                 const size_t prevalence = std::count_if(
 626                         owner_list.begin(), owner_list.end(),
 627                         [&](RowItemOwner *o) { return o == owner; });
 628                 if (prevalence > max_prevalence) {
 629                         max_prevalence = prevalence;
 630                         prevalent_owner = owner;
 631                 }
 632         }
 633
 634         return prevalent_owner;
 635 }
 636
 637 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
 638         const vector< shared_ptr<sigrok::Channel> > &channels,
 639         const unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 640                 &signal_map,
 641         set< shared_ptr<Trace> > &add_list)
 642 {
 643         vector< shared_ptr<Trace> > filtered_traces;
 644
 645         for (const auto &channel : channels)
 646         {
 647                 const auto map_iter = signal_map.find(channel);
 648                 if (map_iter == signal_map.end())
 649                         continue;
 650
 651                 shared_ptr<Trace> trace = (*map_iter).second;
 652                 const auto list_iter = add_list.find(trace);
 653                 if (list_iter == add_list.end())
 654                         continue;
 655
 656                 filtered_traces.push_back(trace);
 657                 add_list.erase(list_iter);
 658         }
 659
 660         return filtered_traces;
 661 }
 662
 663 void View::determine_time_unit()
 664 {
 665         // Check whether we know the sample rate and hence can use time as the unit
 666         if (time_unit_ == util::Samples) {
 667                 shared_lock<shared_mutex> lock(session().signals_mutex());
 668                 const unordered_set< shared_ptr<Signal> > &sigs(session().signals());
 669
 670                 // Check all signals but...
 671                 for (const shared_ptr<Signal> signal : sigs) {
 672                         const shared_ptr<SignalData> data = signal->data();
 673
 674                         // ...only check first segment of each
 675                         const vector< shared_ptr<Segment> > segments = data->segments();
 676                         if (!segments.empty())
 677                                 if (segments[0]->samplerate()) {
 678                                         time_unit_ = util::Time;
 679                                         break;
 680                                 }
 681                 }
 682         }
 683 }
 684
 685 bool View::eventFilter(QObject *object, QEvent *event)
 686 {
 687         const QEvent::Type type = event->type();
 688         if (type == QEvent::MouseMove) {
 689
 690                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
 691                 if (object == viewport_)
 692                         hover_point_ = mouse_event->pos();
 693                 else if (object == ruler_)
 694                         hover_point_ = QPoint(mouse_event->x(), 0);
 695                 else if (object == header_)
 696                         hover_point_ = QPoint(0, mouse_event->y());
 697                 else
 698                         hover_point_ = QPoint(-1, -1);
 699
 700                 hover_point_changed();
 701
 702         } else if (type == QEvent::Leave) {
 703                 hover_point_ = QPoint(-1, -1);
 704                 hover_point_changed();
 705         }
 706
 707         return QObject::eventFilter(object, event);
 708 }
 709
 710 bool View::viewportEvent(QEvent *e)
 711 {
 712         switch(e->type()) {
 713         case QEvent::Paint:
 714         case QEvent::MouseButtonPress:
 715         case QEvent::MouseButtonRelease:
 716         case QEvent::MouseButtonDblClick:
 717         case QEvent::MouseMove:
 718         case QEvent::Wheel:
 719         case QEvent::TouchBegin:
 720         case QEvent::TouchUpdate:
 721         case QEvent::TouchEnd:
 722                 return false;
 723
 724         default:
 725                 return QAbstractScrollArea::viewportEvent(e);
 726         }
 727 }
 728
 729 void View::resizeEvent(QResizeEvent*)
 730 {
 731         update_layout();
 732 }
 733
 734 void View::row_item_appearance_changed(bool label, bool content)
 735 {
 736         if (label)
 737                 header_->update();
 738         if (content)
 739                 viewport_->update();
 740 }
 741
 742 void View::time_item_appearance_changed(bool label, bool content)
 743 {
 744         if (label)
 745                 ruler_->update();
 746         if (content)
 747                 viewport_->update();
 748 }
 749
 750 void View::extents_changed(bool horz, bool vert)
 751 {
 752         sticky_events_ |=
 753                 (horz ? RowItemHExtentsChanged : 0) |
 754                 (vert ? RowItemVExtentsChanged : 0);
 755         lazy_event_handler_.start();
 756 }
 757
 758 void View::h_scroll_value_changed(int value)
 759 {
 760         if (updating_scroll_)
 761                 return;
 762
 763         // Disable sticky scrolling when user moves the horizontal scroll bar
 764         // during a running acquisition
 765         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
 766                 sticky_scrolling_ = false;
 767                 sticky_scrolling_changed(false);
 768         }
 769
 770         const int range = horizontalScrollBar()->maximum();
 771         if (range < MaxScrollValue)
 772                 offset_ = scale_ * value;
 773         else {
 774                 double length = 0, offset;
 775                 get_scroll_layout(length, offset);
 776                 offset_ = scale_ * length * value / MaxScrollValue;
 777         }
 778
 779         ruler_->update();
 780         viewport_->update();
 781 }
 782
 783 void View::v_scroll_value_changed()
 784 {
 785         header_->update();
 786         viewport_->update();
 787 }
 788
 789 void View::signals_changed()
 790 {
 791         vector< shared_ptr<RowItem> > new_top_level_items;
 792
 793         const auto device = session_.device();
 794         if (!device)
 795                 return;
 796
 797         shared_ptr<sigrok::Device> sr_dev = device->device();
 798         assert(sr_dev);
 799
 800         // Make a list of traces that are being added, and a list of traces
 801         // that are being removed
 802         const set<shared_ptr<Trace>> prev_traces = list_by_type<Trace>();
 803
 804         shared_lock<shared_mutex> lock(session_.signals_mutex());
 805         const unordered_set< shared_ptr<Signal> > &sigs(session_.signals());
 806
 807         set< shared_ptr<Trace> > traces(sigs.begin(), sigs.end());
 808
 809 #ifdef ENABLE_DECODE
 810         const vector< shared_ptr<DecodeTrace> > decode_traces(
 811                 session().get_decode_signals());
 812         traces.insert(decode_traces.begin(), decode_traces.end());
 813 #endif
 814
 815         set< shared_ptr<Trace> > add_traces;
 816         set_difference(traces.begin(), traces.end(),
 817                 prev_traces.begin(), prev_traces.end(),
 818                 inserter(add_traces, add_traces.begin()));
 819
 820         set< shared_ptr<Trace> > remove_traces;
 821         set_difference(prev_traces.begin(), prev_traces.end(),
 822                 traces.begin(), traces.end(),
 823                 inserter(remove_traces, remove_traces.begin()));
 824
 825         // Make a look-up table of sigrok Channels to pulseview Signals
 826         unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 827                 signal_map;
 828         for (const shared_ptr<Signal> &sig : sigs)
 829                 signal_map[sig->channel()] = sig;
 830
 831         // Populate channel groups
 832         for (auto entry : sr_dev->channel_groups())
 833         {
 834                 const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
 835
 836                 if (group->channels().size() <= 1)
 837                         continue;
 838
 839                 // Find best trace group to add to
 840                 RowItemOwner *owner = find_prevalent_trace_group(
 841                         group, signal_map);
 842
 843                 // If there is no trace group, create one
 844                 shared_ptr<TraceGroup> new_trace_group;
 845                 if (!owner) {
 846                         new_trace_group.reset(new TraceGroup());
 847                         owner = new_trace_group.get();
 848                 }
 849
 850                 // Extract traces for the trace group, removing them from
 851                 // the add list
 852                 const vector< shared_ptr<Trace> > new_traces_in_group =
 853                         extract_new_traces_for_channels(group->channels(),
 854                                 signal_map, add_traces);
 855
 856                 // Add the traces to the group
 857                 const pair<int, int> prev_v_extents = owner->v_extents();
 858                 int offset = prev_v_extents.second - prev_v_extents.first;
 859                 for (shared_ptr<Trace> trace : new_traces_in_group) {
 860                         assert(trace);
 861                         owner->add_child_item(trace);
 862
 863                         const pair<int, int> extents = trace->v_extents();
 864                         if (trace->enabled())
 865                                 offset += -extents.first;
 866                         trace->force_to_v_offset(offset);
 867                         if (trace->enabled())
 868                                 offset += extents.second;
 869                 }
 870
 871                 // If this is a new group, enqueue it in the new top level
 872                 // items list
 873                 if (!new_traces_in_group.empty() && new_trace_group)
 874                         new_top_level_items.push_back(new_trace_group);
 875         }
 876
 877         // Enqueue the remaining channels as free ungrouped traces
 878         const vector< shared_ptr<Trace> > new_top_level_signals =
 879                 extract_new_traces_for_channels(sr_dev->channels(),
 880                         signal_map, add_traces);
 881         new_top_level_items.insert(new_top_level_items.end(),
 882                 new_top_level_signals.begin(), new_top_level_signals.end());
 883
 884         // Enqueue any remaining traces i.e. decode traces
 885         new_top_level_items.insert(new_top_level_items.end(),
 886                 add_traces.begin(), add_traces.end());
 887
 888         // Remove any removed traces
 889         for (shared_ptr<Trace> trace : remove_traces) {
 890                 RowItemOwner *const owner = trace->owner();
 891                 assert(owner);
 892                 owner->remove_child_item(trace);
 893         }
 894
 895         // Add and position the pending top levels items
 896         for (auto item : new_top_level_items) {
 897                 add_child_item(item);
 898
 899                 // Position the item after the last present item
 900                 int offset = v_extents().second;
 901                 const pair<int, int> extents = item->v_extents();
 902                 if (item->enabled())
 903                         offset += -extents.first;
 904                 item->force_to_v_offset(offset);
 905                 if (item->enabled())
 906                         offset += extents.second;
 907         }
 908
 909         update_layout();
 910
 911         header_->update();
 912         viewport_->update();
 913 }
 914
 915 void View::capture_state_updated(int state)
 916 {
 917         // Reset "always zoom to fit" when we change to the stopped state
 918         if (always_zoom_to_fit_ && (state == Session::Stopped)) {
 919                 always_zoom_to_fit_ = false;
 920                 always_zoom_to_fit_changed(false);
 921         }
 922
 923         if (state == Session::Running)
 924                 time_unit_ = util::Samples;
 925 }
 926
 927 void View::data_updated()
 928 {
 929         if (always_zoom_to_fit_ || sticky_scrolling_) {
 930                 if (!delayed_view_updater_.isActive())
 931                         delayed_view_updater_.start();
 932         } else {
 933                 determine_time_unit();
 934                 update_scroll();
 935                 ruler_->update();
 936                 viewport_->update();
 937         }
 938 }
 939
 940 void View::perform_delayed_view_update()
 941 {
 942         if (always_zoom_to_fit_)
 943                 zoom_fit(true);
 944
 945         if (sticky_scrolling_) {
 946                 // Make right side of the view sticky
 947                 double length = 0, offset;
 948                 get_scroll_layout(length, offset);
 949
 950                 const QSize areaSize = viewport_->size();
 951                 length = max(length - areaSize.width(), 0.0);
 952
 953                 offset_ = scale_ * length;
 954         }
 955
 956         determine_time_unit();
 957         update_scroll();
 958         ruler_->update();
 959         viewport_->update();
 960 }
 961
 962 void View::process_sticky_events()
 963 {
 964         if (sticky_events_ & RowItemHExtentsChanged)
 965                 update_layout();
 966         if (sticky_events_ & RowItemVExtentsChanged) {
 967                 restack_all_row_items();
 968                 update_scroll();
 969         }
 970
 971         // Clear the sticky events
 972         sticky_events_ = 0;
 973 }
 974
 975 void View::on_hover_point_changed()
 976 {
 977         for (shared_ptr<RowItem> r : *this)
 978                 r->hover_point_changed();
 979 }
 980
 981 } // namespace view
 982 } // namespace pv