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 <cassert>
  28 #include <climits>
  29 #include <cmath>
  30 #include <mutex>
  31 #include <unordered_set>
  32
  33 #include <QApplication>
  34 #include <QEvent>
  35 #include <QFontMetrics>
  36 #include <QMouseEvent>
  37 #include <QScrollBar>
  38
  39 #include <libsigrok/libsigrok.hpp>
  40
  41 #include "cursorheader.hpp"
  42 #include "decodetrace.hpp"
  43 #include "header.hpp"
  44 #include "logicsignal.hpp"
  45 #include "ruler.hpp"
  46 #include "signal.hpp"
  47 #include "tracegroup.hpp"
  48 #include "view.hpp"
  49 #include "viewport.hpp"
  50
  51 #include "pv/session.hpp"
  52 #include "pv/data/logic.hpp"
  53 #include "pv/data/logicsegment.hpp"
  54 #include "pv/util.hpp"
  55
  56 using boost::shared_lock;
  57 using boost::shared_mutex;
  58
  59 using pv::data::SignalData;
  60 using pv::data::Segment;
  61 using pv::util::format_time;
  62
  63 using std::back_inserter;
  64 using std::deque;
  65 using std::dynamic_pointer_cast;
  66 using std::list;
  67 using std::lock_guard;
  68 using std::max;
  69 using std::make_pair;
  70 using std::min;
  71 using std::pair;
  72 using std::set;
  73 using std::shared_ptr;
  74 using std::unordered_map;
  75 using std::unordered_set;
  76 using std::vector;
  77 using std::weak_ptr;
  78
  79 namespace pv {
  80 namespace view {
  81
  82 const double View::MaxScale = 1e9;
  83 const double View::MinScale = 1e-15;
  84
  85 const int View::MaxScrollValue = INT_MAX / 2;
  86
  87 const int View::ScaleUnits[3] = {1, 2, 5};
  88
  89 const QColor View::CursorAreaColour(220, 231, 243);
  90
  91 const QSizeF View::LabelPadding(4, 0);
  92
  93 View::View(Session &session, QWidget *parent) :
  94         QAbstractScrollArea(parent),
  95         session_(session),
  96         viewport_(new Viewport(*this)),
  97         ruler_(new Ruler(*this)),
  98         cursorheader_(new CursorHeader(*this)),
  99         header_(new Header(*this)),
 100         scale_(1e-6),
 101         offset_(0),
 102         v_offset_(0),
 103         updating_scroll_(false),
 104         tick_period_(0.0),
 105         tick_prefix_(0),
 106         show_cursors_(false),
 107         cursors_(new CursorPair(*this)),
 108         hover_point_(-1, -1)
 109 {
 110         connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
 111                 this, SLOT(h_scroll_value_changed(int)));
 112         connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 113                 this, SLOT(v_scroll_value_changed(int)));
 114
 115         connect(&session_, SIGNAL(signals_changed()),
 116                 this, SLOT(signals_changed()));
 117         connect(&session_, SIGNAL(capture_state_changed(int)),
 118                 this, SLOT(data_updated()));
 119         connect(&session_, SIGNAL(data_received()),
 120                 this, SLOT(data_updated()));
 121         connect(&session_, SIGNAL(frame_ended()),
 122                 this, SLOT(data_updated()));
 123
 124         connect(cursors_->first().get(), SIGNAL(time_changed()),
 125                 this, SLOT(marker_time_changed()));
 126         connect(cursors_->second().get(), SIGNAL(time_changed()),
 127                 this, SLOT(marker_time_changed()));
 128
 129         connect(header_, SIGNAL(signals_moved()),
 130                 this, SLOT(on_signals_moved()));
 131
 132         connect(header_, SIGNAL(selection_changed()),
 133                 cursorheader_, SLOT(clear_selection()));
 134         connect(cursorheader_, SIGNAL(selection_changed()),
 135                 header_, SLOT(clear_selection()));
 136
 137         connect(header_, SIGNAL(selection_changed()),
 138                 this, SIGNAL(selection_changed()));
 139         connect(cursorheader_, SIGNAL(selection_changed()),
 140                 this, SIGNAL(selection_changed()));
 141
 142         connect(this, SIGNAL(hover_point_changed()),
 143                 this, SLOT(on_hover_point_changed()));
 144
 145         connect(&lazy_event_handler_, SIGNAL(timeout()),
 146                 this, SLOT(process_sticky_events()));
 147         lazy_event_handler_.setSingleShot(true);
 148
 149         setViewport(viewport_);
 150
 151         viewport_->installEventFilter(this);
 152         ruler_->installEventFilter(this);
 153         cursorheader_->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         cursorheader_->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         vector< shared_ptr<TimeItem> > items;
 201         items.push_back(cursors_);
 202         items.push_back(cursors_->first());
 203         items.push_back(cursors_->second());
 204         return items;
 205 }
 206
 207 double View::scale() const
 208 {
 209         return scale_;
 210 }
 211
 212 double View::offset() const
 213 {
 214         return offset_;
 215 }
 216
 217 int View::owner_visual_v_offset() const
 218 {
 219         return -v_offset_;
 220 }
 221
 222 unsigned int View::depth() const
 223 {
 224         return 0;
 225 }
 226
 227 unsigned int View::tick_prefix() const
 228 {
 229         return tick_prefix_;
 230 }
 231
 232 double View::tick_period() const
 233 {
 234         return tick_period_;
 235 }
 236
 237 void View::zoom(double steps)
 238 {
 239         zoom(steps, viewport_->width() / 2);
 240 }
 241
 242 void View::zoom(double steps, int offset)
 243 {
 244         set_zoom(scale_ * pow(3.0/2.0, -steps), offset);
 245 }
 246
 247 void View::zoom_fit()
 248 {
 249         const pair<double, double> extents = get_time_extents();
 250         const double delta = extents.second - extents.first;
 251         if (delta < 1e-12)
 252                 return;
 253
 254         assert(viewport_);
 255         const int w = viewport_->width();
 256         if (w <= 0)
 257                 return;
 258
 259         const double scale = max(min(delta / w, MaxScale), MinScale);
 260         set_scale_offset(scale, extents.first);
 261 }
 262
 263 void View::zoom_one_to_one()
 264 {
 265         using pv::data::SignalData;
 266
 267         // Make a set of all the visible data objects
 268         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 269         if (visible_data.empty())
 270                 return;
 271
 272         double samplerate = 0.0;
 273         for (const shared_ptr<SignalData> d : visible_data) {
 274                 assert(d);
 275                 const vector< shared_ptr<Segment> > segments =
 276                         d->segments();
 277                 for (const shared_ptr<Segment> &s : segments)
 278                         samplerate = max(samplerate, s->samplerate());
 279         }
 280
 281         if (samplerate == 0.0)
 282                 return;
 283
 284         assert(viewport_);
 285         const int w = viewport_->width();
 286         if (w <= 0)
 287                 return;
 288
 289         set_zoom(1.0 / samplerate, w / 2);
 290 }
 291
 292 void View::set_scale_offset(double scale, double offset)
 293 {
 294         scale_ = scale;
 295         offset_ = offset;
 296
 297         calculate_tick_spacing();
 298
 299         update_scroll();
 300         ruler_->update();
 301         cursorheader_->update();
 302         viewport_->update();
 303         scale_offset_changed();
 304 }
 305
 306 set< shared_ptr<SignalData> > View::get_visible_data() const
 307 {
 308         shared_lock<shared_mutex> lock(session().signals_mutex());
 309         const vector< shared_ptr<Signal> > &sigs(session().signals());
 310
 311         // Make a set of all the visible data objects
 312         set< shared_ptr<SignalData> > visible_data;
 313         for (const shared_ptr<Signal> sig : sigs)
 314                 if (sig->enabled())
 315                         visible_data.insert(sig->data());
 316
 317         return visible_data;
 318 }
 319
 320 pair<double, double> View::get_time_extents() const
 321 {
 322         double left_time = DBL_MAX, right_time = DBL_MIN;
 323         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 324         for (const shared_ptr<SignalData> d : visible_data)
 325         {
 326                 const vector< shared_ptr<Segment> > segments =
 327                         d->segments();
 328                 for (const shared_ptr<Segment> &s : segments) {
 329                         double samplerate = s->samplerate();
 330                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 331
 332                         const double start_time = s->start_time();
 333                         left_time = min(left_time, start_time);
 334                         right_time = max(right_time, start_time +
 335                                 d->get_max_sample_count() / samplerate);
 336                 }
 337         }
 338
 339         if (left_time == DBL_MAX && right_time == DBL_MIN)
 340                 return make_pair(0.0, 0.0);
 341
 342         assert(left_time < right_time);
 343         return make_pair(left_time, right_time);
 344 }
 345
 346 bool View::cursors_shown() const
 347 {
 348         return show_cursors_;
 349 }
 350
 351 void View::show_cursors(bool show)
 352 {
 353         show_cursors_ = show;
 354         cursorheader_->update();
 355         viewport_->update();
 356 }
 357
 358 void View::centre_cursors()
 359 {
 360         const double time_width = scale_ * viewport_->width();
 361         cursors_->first()->set_time(offset_ + time_width * 0.4);
 362         cursors_->second()->set_time(offset_ + time_width * 0.6);
 363         cursorheader_->update();
 364         viewport_->update();
 365 }
 366
 367 std::shared_ptr<CursorPair> View::cursors() const
 368 {
 369         return cursors_;
 370 }
 371
 372 const QPoint& View::hover_point() const
 373 {
 374         return hover_point_;
 375 }
 376
 377 void View::update_viewport()
 378 {
 379         assert(viewport_);
 380         viewport_->update();
 381         header_->update();
 382 }
 383
 384 void View::restack_all_row_items()
 385 {
 386         // Make a set of owners
 387         unordered_set< RowItemOwner* > owners;
 388         for (const auto &r : *this)
 389                 owners.insert(r->owner());
 390
 391         // Make a list that is sorted from deepest first
 392         vector< RowItemOwner* > sorted_owners(owners.begin(), owners.end());
 393         sort(sorted_owners.begin(), sorted_owners.end(),
 394                 [](const RowItemOwner* a, const RowItemOwner *b) {
 395                         return a->depth() > b->depth(); });
 396
 397         // Restack the items recursively
 398         for (auto &o : sorted_owners)
 399                 o->restack_items();
 400
 401         // Animate the items to their destination
 402         for (const auto &r : *this)
 403                 r->animate_to_layout_v_offset();
 404 }
 405
 406 void View::get_scroll_layout(double &length, double &offset) const
 407 {
 408         const pair<double, double> extents = get_time_extents();
 409         length = (extents.second - extents.first) / scale_;
 410         offset = offset_ / scale_;
 411 }
 412
 413 void View::set_zoom(double scale, int offset)
 414 {
 415         const double cursor_offset = offset_ + scale_ * offset;
 416         const double new_scale = max(min(scale, MaxScale), MinScale);
 417         const double new_offset = cursor_offset - new_scale * offset;
 418         set_scale_offset(new_scale, new_offset);
 419 }
 420
 421 void View::calculate_tick_spacing()
 422 {
 423         const double SpacingIncrement = 32.0f;
 424         const double MinValueSpacing = 32.0f;
 425
 426         double min_width = SpacingIncrement, typical_width;
 427
 428         QFontMetrics m(QApplication::font());
 429
 430         do {
 431                 const double min_period = scale_ * min_width;
 432
 433                 const int order = (int)floorf(log10f(min_period));
 434                 const double order_decimal = pow(10.0, order);
 435
 436                 unsigned int unit = 0;
 437
 438                 do {
 439                         tick_period_ = order_decimal * ScaleUnits[unit++];
 440                 } while (tick_period_ < min_period &&
 441                         unit < countof(ScaleUnits));
 442
 443                 tick_prefix_ = (order - pv::util::FirstSIPrefixPower) / 3;
 444
 445                 typical_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 446                         Qt::AlignLeft | Qt::AlignTop,
 447                         format_time(offset_, tick_prefix_)).width() +
 448                                 MinValueSpacing;
 449
 450                 min_width += SpacingIncrement;
 451
 452         } while(typical_width > tick_period_ / scale_);
 453 }
 454
 455 void View::update_scroll()
 456 {
 457         assert(viewport_);
 458
 459         const QSize areaSize = viewport_->size();
 460
 461         // Set the horizontal scroll bar
 462         double length = 0, offset = 0;
 463         get_scroll_layout(length, offset);
 464         length = max(length - areaSize.width(), 0.0);
 465
 466         int major_tick_distance = tick_period_ / scale_;
 467
 468         horizontalScrollBar()->setPageStep(areaSize.width() / 2);
 469         horizontalScrollBar()->setSingleStep(major_tick_distance);
 470
 471         updating_scroll_ = true;
 472
 473         if (length < MaxScrollValue) {
 474                 horizontalScrollBar()->setRange(0, length);
 475                 horizontalScrollBar()->setSliderPosition(offset);
 476         } else {
 477                 horizontalScrollBar()->setRange(0, MaxScrollValue);
 478                 horizontalScrollBar()->setSliderPosition(
 479                         offset_ * MaxScrollValue / (scale_ * length));
 480         }
 481
 482         updating_scroll_ = false;
 483
 484         // Set the vertical scrollbar
 485         verticalScrollBar()->setPageStep(areaSize.height());
 486         verticalScrollBar()->setSingleStep(areaSize.height() / 8);
 487
 488         const pair<int, int> extents = v_extents();
 489         verticalScrollBar()->setRange(extents.first - (areaSize.height() / 2),
 490                 extents.second - (areaSize.height() / 2));
 491 }
 492
 493 void View::update_layout()
 494 {
 495         setViewportMargins(
 496                 header_->sizeHint().width() - pv::view::Header::BaselineOffset,
 497                 ruler_->sizeHint().height(), 0, 0);
 498         ruler_->setGeometry(viewport_->x(), 0,
 499                 viewport_->width(), viewport_->y());
 500         cursorheader_->setGeometry(
 501                 viewport_->x(),
 502                 ruler_->sizeHint().height() - cursorheader_->sizeHint().height() / 2,
 503                 viewport_->width(), cursorheader_->sizeHint().height());
 504         header_->setGeometry(0, viewport_->y(),
 505                 header_->sizeHint().width(), viewport_->height());
 506         update_scroll();
 507 }
 508
 509 void View::paint_label(QPainter &p, const QRect &rect, bool hover)
 510 {
 511         (void)p;
 512         (void)rect;
 513         (void)hover;
 514 }
 515
 516 QRectF View::label_rect(const QRectF &rect)
 517 {
 518         (void)rect;
 519         return QRectF();
 520 }
 521
 522 bool View::add_channels_to_owner(
 523         const vector< shared_ptr<sigrok::Channel> > &channels,
 524         RowItemOwner *owner, int &offset,
 525         unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 526                 &signal_map,
 527         std::function<bool (shared_ptr<RowItem>)> filter_func)
 528 {
 529         bool any_added = false;
 530
 531         assert(owner);
 532
 533         for (const auto &channel : channels)
 534         {
 535                 const auto iter = signal_map.find(channel);
 536                 if (iter == signal_map.end() ||
 537                         (filter_func && !filter_func((*iter).second)))
 538                         continue;
 539
 540                 shared_ptr<RowItem> row_item = (*iter).second;
 541                 owner->add_child_item(row_item);
 542                 apply_offset(row_item, offset);
 543                 signal_map.erase(iter);
 544
 545                 any_added = true;
 546         }
 547
 548         return any_added;
 549 }
 550
 551 void View::apply_offset(shared_ptr<RowItem> row_item, int &offset) {
 552         assert(row_item);
 553         const pair<int, int> extents = row_item->v_extents();
 554         if (row_item->enabled())
 555                 offset += -extents.first;
 556         row_item->force_to_v_offset(offset);
 557         if (row_item->enabled())
 558                 offset += extents.second;
 559 }
 560
 561 bool View::eventFilter(QObject *object, QEvent *event)
 562 {
 563         const QEvent::Type type = event->type();
 564         if (type == QEvent::MouseMove) {
 565
 566                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
 567                 if (object == viewport_)
 568                         hover_point_ = mouse_event->pos();
 569                 else if (object == ruler_ || object == cursorheader_)
 570                         hover_point_ = QPoint(mouse_event->x(), 0);
 571                 else if (object == header_)
 572                         hover_point_ = QPoint(0, mouse_event->y());
 573                 else
 574                         hover_point_ = QPoint(-1, -1);
 575
 576                 hover_point_changed();
 577
 578         } else if (type == QEvent::Leave) {
 579                 hover_point_ = QPoint(-1, -1);
 580                 hover_point_changed();
 581         }
 582
 583         return QObject::eventFilter(object, event);
 584 }
 585
 586 bool View::viewportEvent(QEvent *e)
 587 {
 588         switch(e->type()) {
 589         case QEvent::Paint:
 590         case QEvent::MouseButtonPress:
 591         case QEvent::MouseButtonRelease:
 592         case QEvent::MouseButtonDblClick:
 593         case QEvent::MouseMove:
 594         case QEvent::Wheel:
 595         case QEvent::TouchBegin:
 596         case QEvent::TouchUpdate:
 597         case QEvent::TouchEnd:
 598                 return false;
 599
 600         default:
 601                 return QAbstractScrollArea::viewportEvent(e);
 602         }
 603 }
 604
 605 void View::resizeEvent(QResizeEvent*)
 606 {
 607         update_layout();
 608 }
 609
 610 void View::row_item_appearance_changed(bool label, bool content)
 611 {
 612         if (label)
 613                 header_->update();
 614         if (content)
 615                 viewport_->update();
 616 }
 617
 618 void View::extents_changed(bool horz, bool vert)
 619 {
 620         sticky_events_ |=
 621                 (horz ? RowItemHExtentsChanged : 0) |
 622                 (vert ? RowItemVExtentsChanged : 0);
 623         lazy_event_handler_.start();
 624 }
 625
 626 void View::h_scroll_value_changed(int value)
 627 {
 628         if (updating_scroll_)
 629                 return;
 630
 631         const int range = horizontalScrollBar()->maximum();
 632         if (range < MaxScrollValue)
 633                 offset_ = scale_ * value;
 634         else {
 635                 double length = 0, offset;
 636                 get_scroll_layout(length, offset);
 637                 offset_ = scale_ * length * value / MaxScrollValue;
 638         }
 639
 640         ruler_->update();
 641         cursorheader_->update();
 642         viewport_->update();
 643 }
 644
 645 void View::v_scroll_value_changed(int value)
 646 {
 647         v_offset_ = value;
 648         header_->update();
 649         viewport_->update();
 650 }
 651
 652 void View::signals_changed()
 653 {
 654         int offset = 0;
 655
 656         // Populate the traces
 657         clear_child_items();
 658
 659         shared_ptr<sigrok::Device> device = session_.device();
 660         assert(device);
 661
 662         // Collect a set of signals
 663         unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 664                 signal_map;
 665
 666         shared_lock<shared_mutex> lock(session_.signals_mutex());
 667         const vector< shared_ptr<Signal> > &sigs(session_.signals());
 668
 669         for (const shared_ptr<Signal> &sig : sigs)
 670                 signal_map[sig->channel()] = sig;
 671
 672         // Populate channel groups
 673         for (auto entry : device->channel_groups())
 674         {
 675                 const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
 676
 677                 if (group->channels().size() <= 1)
 678                         continue;
 679
 680                 shared_ptr<TraceGroup> trace_group(new TraceGroup());
 681                 int child_offset = 0;
 682                 if (add_channels_to_owner(group->channels(),
 683                         trace_group.get(), child_offset, signal_map))
 684                 {
 685                         add_child_item(trace_group);
 686                         apply_offset(trace_group, offset);
 687                 }
 688         }
 689
 690         // Add the remaining logic channels
 691         shared_ptr<TraceGroup> logic_trace_group(new TraceGroup());
 692         int child_offset = 0;
 693
 694         if (add_channels_to_owner(device->channels(),
 695                 logic_trace_group.get(), child_offset, signal_map,
 696                 [](shared_ptr<RowItem> r) -> bool {
 697                         return dynamic_pointer_cast<LogicSignal>(r) != nullptr;
 698                         }))
 699
 700         {
 701                 add_child_item(logic_trace_group);
 702                 apply_offset(logic_trace_group, offset);
 703         }
 704
 705         // Add the remaining channels
 706         add_channels_to_owner(device->channels(), this, offset, signal_map);
 707         assert(signal_map.empty());
 708
 709         // Add decode signals
 710 #ifdef ENABLE_DECODE
 711         const vector< shared_ptr<DecodeTrace> > decode_sigs(
 712                 session().get_decode_signals());
 713         for (auto s : decode_sigs) {
 714                 add_child_item(s);
 715                 apply_offset(s, offset);
 716         }
 717 #endif
 718
 719         update_layout();
 720 }
 721
 722 void View::data_updated()
 723 {
 724         // Update the scroll bars
 725         update_scroll();
 726
 727         // Repaint the view
 728         viewport_->update();
 729 }
 730
 731 void View::marker_time_changed()
 732 {
 733         cursorheader_->update();
 734         viewport_->update();
 735 }
 736
 737 void View::on_signals_moved()
 738 {
 739         update_scroll();
 740         signals_moved();
 741 }
 742
 743 void View::process_sticky_events()
 744 {
 745         if (sticky_events_ & RowItemHExtentsChanged)
 746                 update_layout();
 747         if (sticky_events_ & RowItemVExtentsChanged)
 748                 restack_all_row_items();
 749
 750         // Clear the sticky events
 751         sticky_events_ = 0;
 752 }
 753
 754 void View::on_hover_point_changed()
 755 {
 756         for (shared_ptr<RowItem> r : *this)
 757                 r->hover_point_changed();
 758 }
 759
 760 } // namespace view
 761 } // namespace pv