]> sigrok.org Git - pulseview.git/blobdiff - pv/view/view.cpp
Session: Fix issue #67 by improving error handling
[pulseview.git] / pv / view / view.cpp
diff --git a/pv/view/view.cpp b/pv/view/view.cpp
deleted file mode 100644 (file)
index 8e48ae4..0000000
+++ /dev/null
@@ -1,1136 +0,0 @@
-/*
- * This file is part of the PulseView project.
- *
- * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
- */
-
-#ifdef ENABLE_DECODE
-#include <libsigrokdecode/libsigrokdecode.h>
-#endif
-
-#include <extdef.h>
-
-#include <algorithm>
-#include <cassert>
-#include <climits>
-#include <cmath>
-#include <iterator>
-#include <mutex>
-#include <unordered_set>
-
-#include <boost/thread/locks.hpp>
-
-#include <QApplication>
-#include <QEvent>
-#include <QFontMetrics>
-#include <QMouseEvent>
-#include <QScrollBar>
-
-#include <libsigrokcxx/libsigrokcxx.hpp>
-
-#include "analogsignal.hpp"
-#include "header.hpp"
-#include "logicsignal.hpp"
-#include "ruler.hpp"
-#include "signal.hpp"
-#include "tracegroup.hpp"
-#include "triggermarker.hpp"
-#include "view.hpp"
-#include "viewport.hpp"
-
-#include "pv/session.hpp"
-#include "pv/devices/device.hpp"
-#include "pv/data/logic.hpp"
-#include "pv/data/logicsegment.hpp"
-#include "pv/util.hpp"
-
-#ifdef ENABLE_DECODE
-#include "decodetrace.hpp"
-#endif
-
-using boost::shared_lock;
-using boost::shared_mutex;
-
-using pv::data::SignalData;
-using pv::data::Segment;
-using pv::util::TimeUnit;
-using pv::util::Timestamp;
-
-using std::back_inserter;
-using std::copy_if;
-using std::deque;
-using std::dynamic_pointer_cast;
-using std::inserter;
-using std::list;
-using std::lock_guard;
-using std::max;
-using std::make_pair;
-using std::make_shared;
-using std::min;
-using std::pair;
-using std::set;
-using std::set_difference;
-using std::shared_ptr;
-using std::unordered_map;
-using std::unordered_set;
-using std::vector;
-using std::weak_ptr;
-
-namespace pv {
-namespace view {
-
-const Timestamp View::MaxScale("1e9");
-const Timestamp View::MinScale("1e-12");
-
-const int View::MaxScrollValue = INT_MAX / 2;
-const int View::MaxViewAutoUpdateRate = 25; // No more than 25 Hz with sticky scrolling
-
-const int View::ScaleUnits[3] = {1, 2, 5};
-
-View::View(Session &session, QWidget *parent) :
-       QAbstractScrollArea(parent),
-       session_(session),
-       viewport_(new Viewport(*this)),
-       ruler_(new Ruler(*this)),
-       header_(new Header(*this)),
-       scale_(1e-3),
-       offset_(0),
-       updating_scroll_(false),
-       sticky_scrolling_(false), // Default setting is set in MainWindow::setup_ui()
-       always_zoom_to_fit_(false),
-       tick_period_(0),
-       tick_prefix_(pv::util::SIPrefix::yocto),
-       tick_precision_(0),
-       time_unit_(util::TimeUnit::Time),
-       show_cursors_(false),
-       cursors_(new CursorPair(*this)),
-       next_flag_text_('A'),
-       trigger_markers_(),
-       hover_point_(-1, -1)
-{
-       connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
-               this, SLOT(h_scroll_value_changed(int)));
-       connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
-               this, SLOT(v_scroll_value_changed()));
-
-       connect(&session_, SIGNAL(signals_changed()),
-               this, SLOT(signals_changed()));
-       connect(&session_, SIGNAL(capture_state_changed(int)),
-               this, SLOT(capture_state_updated(int)));
-       connect(&session_, SIGNAL(data_received()),
-               this, SLOT(data_updated()));
-       connect(&session_, SIGNAL(frame_ended()),
-               this, SLOT(data_updated()));
-
-       connect(header_, SIGNAL(selection_changed()),
-               ruler_, SLOT(clear_selection()));
-       connect(ruler_, SIGNAL(selection_changed()),
-               header_, SLOT(clear_selection()));
-
-       connect(header_, SIGNAL(selection_changed()),
-               this, SIGNAL(selection_changed()));
-       connect(ruler_, SIGNAL(selection_changed()),
-               this, SIGNAL(selection_changed()));
-
-       connect(this, SIGNAL(hover_point_changed()),
-               this, SLOT(on_hover_point_changed()));
-
-       connect(&lazy_event_handler_, SIGNAL(timeout()),
-               this, SLOT(process_sticky_events()));
-       lazy_event_handler_.setSingleShot(true);
-
-       connect(&delayed_view_updater_, SIGNAL(timeout()),
-               this, SLOT(perform_delayed_view_update()));
-       delayed_view_updater_.setSingleShot(true);
-       delayed_view_updater_.setInterval(1000 / MaxViewAutoUpdateRate);
-
-       setViewport(viewport_);
-
-       viewport_->installEventFilter(this);
-       ruler_->installEventFilter(this);
-       header_->installEventFilter(this);
-
-       // Trigger the initial event manually. The default device has signals
-       // which were created before this object came into being
-       signals_changed();
-
-       // make sure the transparent widgets are on the top
-       ruler_->raise();
-       header_->raise();
-
-       // Update the zoom state
-       calculate_tick_spacing();
-}
-
-Session& View::session()
-{
-       return session_;
-}
-
-const Session& View::session() const
-{
-       return session_;
-}
-
-View* View::view()
-{
-       return this;
-}
-
-const View* View::view() const
-{
-       return this;
-}
-
-Viewport* View::viewport()
-{
-       return viewport_;
-}
-
-const Viewport* View::viewport() const
-{
-       return viewport_;
-}
-
-vector< shared_ptr<TimeItem> > View::time_items() const
-{
-       const vector<shared_ptr<Flag>> f(flags());
-       vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
-       items.push_back(cursors_);
-       items.push_back(cursors_->first());
-       items.push_back(cursors_->second());
-
-       for (auto trigger_marker : trigger_markers_)
-               items.push_back(trigger_marker);
-
-       return items;
-}
-
-double View::scale() const
-{
-       return scale_;
-}
-
-void View::set_scale(double scale)
-{
-       if (scale_ != scale) {
-               scale_ = scale;
-               Q_EMIT scale_changed();
-       }
-}
-
-const Timestamp& View::offset() const
-{
-       return offset_;
-}
-
-void View::set_offset(const pv::util::Timestamp& offset)
-{
-       if (offset_ != offset) {
-               offset_ = offset;
-               Q_EMIT offset_changed();
-       }
-}
-
-int View::owner_visual_v_offset() const
-{
-       return -verticalScrollBar()->sliderPosition();
-}
-
-void View::set_v_offset(int offset)
-{
-       verticalScrollBar()->setSliderPosition(offset);
-       header_->update();
-       viewport_->update();
-}
-
-unsigned int View::depth() const
-{
-       return 0;
-}
-
-pv::util::SIPrefix View::tick_prefix() const
-{
-       return tick_prefix_;
-}
-
-void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
-{
-       if (tick_prefix_ != tick_prefix) {
-               tick_prefix_ = tick_prefix;
-               Q_EMIT tick_prefix_changed();
-       }
-}
-
-unsigned int View::tick_precision() const
-{
-       return tick_precision_;
-}
-
-void View::set_tick_precision(unsigned tick_precision)
-{
-       if (tick_precision_ != tick_precision) {
-               tick_precision_ = tick_precision;
-               Q_EMIT tick_precision_changed();
-       }
-}
-
-const pv::util::Timestamp& View::tick_period() const
-{
-       return tick_period_;
-}
-
-void View::set_tick_period(const pv::util::Timestamp& tick_period)
-{
-       if (tick_period_ != tick_period) {
-               tick_period_ = tick_period;
-               Q_EMIT tick_period_changed();
-       }
-}
-
-TimeUnit View::time_unit() const
-{
-       return time_unit_;
-}
-
-void View::set_time_unit(pv::util::TimeUnit time_unit)
-{
-       if (time_unit_ != time_unit) {
-               time_unit_ = time_unit;
-               Q_EMIT time_unit_changed();
-       }
-}
-
-void View::zoom(double steps)
-{
-       zoom(steps, viewport_->width() / 2);
-}
-
-void View::zoom(double steps, int offset)
-{
-       set_zoom(scale_ * pow(3.0/2.0, -steps), offset);
-}
-
-void View::zoom_fit(bool gui_state)
-{
-       // Act as one-shot when stopped, toggle along with the GUI otherwise
-       if (session_.get_capture_state() == Session::Stopped) {
-               always_zoom_to_fit_ = false;
-               always_zoom_to_fit_changed(false);
-       } else {
-               always_zoom_to_fit_ = gui_state;
-               always_zoom_to_fit_changed(gui_state);
-       }
-
-       const pair<Timestamp, Timestamp> extents = get_time_extents();
-       const Timestamp delta = extents.second - extents.first;
-       if (delta < Timestamp("1e-12"))
-               return;
-
-       assert(viewport_);
-       const int w = viewport_->width();
-       if (w <= 0)
-               return;
-
-       const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
-       set_scale_offset(scale.convert_to<double>(), extents.first);
-}
-
-void View::zoom_one_to_one()
-{
-       using pv::data::SignalData;
-
-       // Make a set of all the visible data objects
-       set< shared_ptr<SignalData> > visible_data = get_visible_data();
-       if (visible_data.empty())
-               return;
-
-       assert(viewport_);
-       const int w = viewport_->width();
-       if (w <= 0)
-               return;
-
-       set_zoom(1.0 / session_.get_samplerate(), w / 2);
-}
-
-void View::set_scale_offset(double scale, const Timestamp& offset)
-{
-       // Disable sticky scrolling / always zoom to fit when acquisition runs
-       // and user drags the viewport
-       if ((scale_ == scale) && (offset_ != offset) &&
-                       (session_.get_capture_state() == Session::Running)) {
-
-               if (sticky_scrolling_) {
-                       sticky_scrolling_ = false;
-                       sticky_scrolling_changed(false);
-               }
-
-               if (always_zoom_to_fit_) {
-                       always_zoom_to_fit_ = false;
-                       always_zoom_to_fit_changed(false);
-               }
-       }
-
-       set_scale(scale);
-       set_offset(offset);
-
-       calculate_tick_spacing();
-
-       update_scroll();
-       ruler_->update();
-       viewport_->update();
-}
-
-set< shared_ptr<SignalData> > View::get_visible_data() const
-{
-       const unordered_set< shared_ptr<Signal> > sigs(session().signals());
-
-       // Make a set of all the visible data objects
-       set< shared_ptr<SignalData> > visible_data;
-       for (const shared_ptr<Signal> sig : sigs)
-               if (sig->enabled())
-                       visible_data.insert(sig->data());
-
-       return visible_data;
-}
-
-pair<Timestamp, Timestamp> View::get_time_extents() const
-{
-       boost::optional<Timestamp> left_time, right_time;
-       const set< shared_ptr<SignalData> > visible_data = get_visible_data();
-       for (const shared_ptr<SignalData> d : visible_data) {
-               const vector< shared_ptr<Segment> > segments =
-                       d->segments();
-               for (const shared_ptr<Segment> &s : segments) {
-                       double samplerate = s->samplerate();
-                       samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
-
-                       const Timestamp start_time = s->start_time();
-                       left_time = left_time ?
-                               min(*left_time, start_time) :
-                                               start_time;
-                       right_time = right_time ?
-                               max(*right_time, start_time + d->max_sample_count() / samplerate) :
-                                                start_time + d->max_sample_count() / samplerate;
-               }
-       }
-
-       if (!left_time || !right_time)
-               return make_pair(0, 0);
-
-       assert(*left_time < *right_time);
-       return make_pair(*left_time, *right_time);
-}
-
-void View::enable_sticky_scrolling(bool state)
-{
-       sticky_scrolling_ = state;
-}
-
-void View::enable_coloured_bg(bool state)
-{
-       const vector<shared_ptr<TraceTreeItem>> items(
-               list_by_type<TraceTreeItem>());
-
-       for (shared_ptr<TraceTreeItem> i : items) {
-               // Can't cast to Trace because it's abstract, so we need to
-               // check for any derived classes individually
-
-               shared_ptr<AnalogSignal> a = dynamic_pointer_cast<AnalogSignal>(i);
-               if (a)
-                       a->set_coloured_bg(state);
-
-               shared_ptr<LogicSignal> l = dynamic_pointer_cast<LogicSignal>(i);
-               if (l)
-                       l->set_coloured_bg(state);
-
-#ifdef ENABLE_DECODE
-               shared_ptr<DecodeTrace> d = dynamic_pointer_cast<DecodeTrace>(i);
-               if (d)
-                       d->set_coloured_bg(state);
-#endif
-       }
-
-       viewport_->update();
-}
-
-bool View::cursors_shown() const
-{
-       return show_cursors_;
-}
-
-void View::show_cursors(bool show)
-{
-       show_cursors_ = show;
-       ruler_->update();
-       viewport_->update();
-}
-
-void View::centre_cursors()
-{
-       const double time_width = scale_ * viewport_->width();
-       cursors_->first()->set_time(offset_ + time_width * 0.4);
-       cursors_->second()->set_time(offset_ + time_width * 0.6);
-       ruler_->update();
-       viewport_->update();
-}
-
-std::shared_ptr<CursorPair> View::cursors() const
-{
-       return cursors_;
-}
-
-void View::add_flag(const Timestamp& time)
-{
-       flags_.push_back(shared_ptr<Flag>(new Flag(*this, time,
-               QString("%1").arg(next_flag_text_))));
-
-       next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
-               (next_flag_text_ + 1);
-
-       time_item_appearance_changed(true, true);
-}
-
-void View::remove_flag(std::shared_ptr<Flag> flag)
-{
-       flags_.remove(flag);
-       time_item_appearance_changed(true, true);
-}
-
-vector< std::shared_ptr<Flag> > View::flags() const
-{
-       vector< std::shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
-       stable_sort(flags.begin(), flags.end(),
-               [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
-                       return a->time() < b->time();
-               });
-
-       return flags;
-}
-
-const QPoint& View::hover_point() const
-{
-       return hover_point_;
-}
-
-void View::update_viewport()
-{
-       assert(viewport_);
-       viewport_->update();
-       header_->update();
-}
-
-void View::restack_all_trace_tree_items()
-{
-       // Make a list of owners that is sorted from deepest first
-       const vector<shared_ptr<TraceTreeItem>> items(
-               list_by_type<TraceTreeItem>());
-       set< TraceTreeItemOwner* > owners;
-       for (const auto &r : items)
-               owners.insert(r->owner());
-       vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
-       sort(sorted_owners.begin(), sorted_owners.end(),
-               [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
-                       return a->depth() > b->depth(); });
-
-       // Restack the items recursively
-       for (auto &o : sorted_owners)
-               o->restack_items();
-
-       // Re-assign background colors
-       bool next_bgcolour_state = 0;
-
-       for (auto &o : sorted_owners)
-               next_bgcolour_state = o->reassign_bgcolour_states(next_bgcolour_state);
-
-       // Animate the items to their destination
-       for (const auto &i : items)
-               i->animate_to_layout_v_offset();
-}
-
-void View::trigger_event(util::Timestamp location)
-{
-       trigger_markers_.push_back(shared_ptr<TriggerMarker>(
-               new TriggerMarker(*this, location)));
-}
-
-void View::get_scroll_layout(double &length, Timestamp &offset) const
-{
-       const pair<Timestamp, Timestamp> extents = get_time_extents();
-       length = ((extents.second - extents.first) / scale_).convert_to<double>();
-       offset = offset_ / scale_;
-}
-
-void View::set_zoom(double scale, int offset)
-{
-       // Reset the "always zoom to fit" feature as the user changed the zoom
-       always_zoom_to_fit_ = false;
-       always_zoom_to_fit_changed(false);
-
-       const Timestamp cursor_offset = offset_ + scale_ * offset;
-       const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
-       const Timestamp new_offset = cursor_offset - new_scale * offset;
-       set_scale_offset(new_scale.convert_to<double>(), new_offset);
-}
-
-void View::calculate_tick_spacing()
-{
-       const double SpacingIncrement = 10.0f;
-       const double MinValueSpacing = 40.0f;
-
-       // Figure out the highest numeric value visible on a label
-       const QSize areaSize = viewport_->size();
-       const Timestamp max_time = max(fabs(offset_),
-               fabs(offset_ + scale_ * areaSize.width()));
-
-       double min_width = SpacingIncrement;
-       double label_width, tick_period_width;
-
-       QFontMetrics m(QApplication::font());
-
-       // Copies of the member variables with the same name, used in the calculation
-       // and written back afterwards, so that we don't emit signals all the time
-       // during the calculation.
-       pv::util::Timestamp tick_period = tick_period_;
-       pv::util::SIPrefix tick_prefix = tick_prefix_;
-       unsigned tick_precision = tick_precision_;
-
-       do {
-               const double min_period = scale_ * min_width;
-
-               const int order = (int)floorf(log10f(min_period));
-               const pv::util::Timestamp order_decimal =
-                       pow(pv::util::Timestamp(10), order);
-
-               // Allow for a margin of error so that a scale unit of 1 can be used.
-               // Otherwise, for a SU of 1 the tick period will almost always be below
-               // the min_period by a small amount - and thus skipped in favor of 2.
-               // Note: margin assumes that SU[0] and SU[1] contain the smallest values
-               double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
-               double tp_with_margin;
-               unsigned int unit = 0;
-
-               do {
-                       tp_with_margin = order_decimal.convert_to<double>() *
-                               (ScaleUnits[unit++] + tp_margin);
-               } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
-
-               tick_period = order_decimal * ScaleUnits[unit - 1];
-               tick_prefix = static_cast<pv::util::SIPrefix>(
-                       (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
-
-               // Precision is the number of fractional digits required, not
-               // taking the prefix into account (and it must never be negative)
-               tick_precision = std::max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
-
-               tick_period_width = (tick_period / scale_).convert_to<double>();
-
-               const QString label_text = Ruler::format_time_with_distance(
-                       tick_period, max_time, tick_prefix, time_unit_, tick_precision);
-
-               label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
-                       Qt::AlignLeft | Qt::AlignTop, label_text).width() +
-                               MinValueSpacing;
-
-               min_width += SpacingIncrement;
-       } while (tick_period_width < label_width);
-
-       set_tick_period(tick_period);
-       set_tick_prefix(tick_prefix);
-       set_tick_precision(tick_precision);
-}
-
-void View::update_scroll()
-{
-       assert(viewport_);
-
-       const QSize areaSize = viewport_->size();
-
-       // Set the horizontal scroll bar
-       double length = 0;
-       Timestamp offset;
-       get_scroll_layout(length, offset);
-       length = max(length - areaSize.width(), 0.0);
-
-       int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
-
-       horizontalScrollBar()->setPageStep(areaSize.width() / 2);
-       horizontalScrollBar()->setSingleStep(major_tick_distance);
-
-       updating_scroll_ = true;
-
-       if (length < MaxScrollValue) {
-               horizontalScrollBar()->setRange(0, length);
-               horizontalScrollBar()->setSliderPosition(offset.convert_to<double>());
-       } else {
-               horizontalScrollBar()->setRange(0, MaxScrollValue);
-               horizontalScrollBar()->setSliderPosition(
-                       (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
-       }
-
-       updating_scroll_ = false;
-
-       // Set the vertical scrollbar
-       verticalScrollBar()->setPageStep(areaSize.height());
-       verticalScrollBar()->setSingleStep(areaSize.height() / 8);
-
-       const pair<int, int> extents = v_extents();
-       verticalScrollBar()->setRange(extents.first - (areaSize.height() / 2),
-               extents.second - (areaSize.height() / 2));
-}
-
-void View::update_layout()
-{
-       setViewportMargins(
-               header_->sizeHint().width() - pv::view::Header::BaselineOffset,
-               ruler_->sizeHint().height(), 0, 0);
-       ruler_->setGeometry(viewport_->x(), 0,
-               viewport_->width(), ruler_->extended_size_hint().height());
-       header_->setGeometry(0, viewport_->y(),
-               header_->extended_size_hint().width(), viewport_->height());
-       update_scroll();
-}
-
-void View::paint_label(QPainter &p, const QRect &rect, bool hover)
-{
-       (void)p;
-       (void)rect;
-       (void)hover;
-}
-
-QRectF View::label_rect(const QRectF &rect)
-{
-       (void)rect;
-       return QRectF();
-}
-
-TraceTreeItemOwner* View::find_prevalent_trace_group(
-       const shared_ptr<sigrok::ChannelGroup> &group,
-       const unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
-               &signal_map)
-{
-       assert(group);
-
-       unordered_set<TraceTreeItemOwner*> owners;
-       vector<TraceTreeItemOwner*> owner_list;
-
-       // Make a set and a list of all the owners
-       for (const auto &channel : group->channels()) {
-               const auto iter = signal_map.find(channel);
-               if (iter == signal_map.end())
-                       continue;
-
-               TraceTreeItemOwner *const o = (*iter).second->owner();
-               owner_list.push_back(o);
-               owners.insert(o);
-       }
-
-       // Iterate through the list of owners, and find the most prevalent
-       size_t max_prevalence = 0;
-       TraceTreeItemOwner *prevalent_owner = nullptr;
-       for (TraceTreeItemOwner *owner : owners) {
-               const size_t prevalence = std::count_if(
-                       owner_list.begin(), owner_list.end(),
-                       [&](TraceTreeItemOwner *o) { return o == owner; });
-               if (prevalence > max_prevalence) {
-                       max_prevalence = prevalence;
-                       prevalent_owner = owner;
-               }
-       }
-
-       return prevalent_owner;
-}
-
-vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
-       const vector< shared_ptr<sigrok::Channel> > &channels,
-       const unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
-               &signal_map,
-       set< shared_ptr<Trace> > &add_list)
-{
-       vector< shared_ptr<Trace> > filtered_traces;
-
-       for (const auto &channel : channels) {
-               const auto map_iter = signal_map.find(channel);
-               if (map_iter == signal_map.end())
-                       continue;
-
-               shared_ptr<Trace> trace = (*map_iter).second;
-               const auto list_iter = add_list.find(trace);
-               if (list_iter == add_list.end())
-                       continue;
-
-               filtered_traces.push_back(trace);
-               add_list.erase(list_iter);
-       }
-
-       return filtered_traces;
-}
-
-void View::determine_time_unit()
-{
-       // Check whether we know the sample rate and hence can use time as the unit
-       if (time_unit_ == util::TimeUnit::Samples) {
-               const unordered_set< shared_ptr<Signal> > sigs(session().signals());
-
-               // Check all signals but...
-               for (const shared_ptr<Signal> signal : sigs) {
-                       const shared_ptr<SignalData> data = signal->data();
-
-                       // ...only check first segment of each
-                       const vector< shared_ptr<Segment> > segments = data->segments();
-                       if (!segments.empty())
-                               if (segments[0]->samplerate()) {
-                                       set_time_unit(util::TimeUnit::Time);
-                                       break;
-                               }
-               }
-       }
-}
-
-bool View::eventFilter(QObject *object, QEvent *event)
-{
-       const QEvent::Type type = event->type();
-       if (type == QEvent::MouseMove) {
-
-               const QMouseEvent *const mouse_event = (QMouseEvent*)event;
-               if (object == viewport_)
-                       hover_point_ = mouse_event->pos();
-               else if (object == ruler_)
-                       hover_point_ = QPoint(mouse_event->x(), 0);
-               else if (object == header_)
-                       hover_point_ = QPoint(0, mouse_event->y());
-               else
-                       hover_point_ = QPoint(-1, -1);
-
-               hover_point_changed();
-
-       } else if (type == QEvent::Leave) {
-               hover_point_ = QPoint(-1, -1);
-               hover_point_changed();
-       }
-
-       return QObject::eventFilter(object, event);
-}
-
-bool View::viewportEvent(QEvent *event)
-{
-       switch (event->type()) {
-       case QEvent::Paint:
-       case QEvent::MouseButtonPress:
-       case QEvent::MouseButtonRelease:
-       case QEvent::MouseButtonDblClick:
-       case QEvent::MouseMove:
-       case QEvent::Wheel:
-       case QEvent::TouchBegin:
-       case QEvent::TouchUpdate:
-       case QEvent::TouchEnd:
-               return false;
-       default:
-               return QAbstractScrollArea::viewportEvent(event);
-       }
-}
-
-void View::resizeEvent(QResizeEvent*)
-{
-       update_layout();
-}
-
-void View::row_item_appearance_changed(bool label, bool content)
-{
-       if (label)
-               header_->update();
-       if (content)
-               viewport_->update();
-}
-
-void View::time_item_appearance_changed(bool label, bool content)
-{
-       if (label)
-               ruler_->update();
-       if (content)
-               viewport_->update();
-}
-
-void View::extents_changed(bool horz, bool vert)
-{
-       sticky_events_ |=
-               (horz ? TraceTreeItemHExtentsChanged : 0) |
-               (vert ? TraceTreeItemVExtentsChanged : 0);
-       lazy_event_handler_.start();
-}
-
-void View::h_scroll_value_changed(int value)
-{
-       if (updating_scroll_)
-               return;
-
-       // Disable sticky scrolling when user moves the horizontal scroll bar
-       // during a running acquisition
-       if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
-               sticky_scrolling_ = false;
-               sticky_scrolling_changed(false);
-       }
-
-       const int range = horizontalScrollBar()->maximum();
-       if (range < MaxScrollValue)
-               set_offset(scale_ * value);
-       else {
-               double length = 0;
-               Timestamp offset;
-               get_scroll_layout(length, offset);
-               set_offset(scale_ * length * value / MaxScrollValue);
-       }
-
-       ruler_->update();
-       viewport_->update();
-}
-
-void View::v_scroll_value_changed()
-{
-       header_->update();
-       viewport_->update();
-}
-
-void View::signals_changed()
-{
-       using sigrok::Channel;
-
-       vector< shared_ptr<TraceTreeItem> > new_top_level_items;
-
-       if (!session_.device())
-               return;
-
-       shared_ptr<sigrok::Device> sr_dev = session_.device()->device();
-       assert(sr_dev);
-       const vector< shared_ptr<Channel> > channels(
-               sr_dev->channels());
-
-       // Make a list of traces that are being added, and a list of traces
-       // that are being removed
-       const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
-       const set<shared_ptr<Trace>> prev_traces(
-               prev_trace_list.begin(), prev_trace_list.end());
-
-       const unordered_set< shared_ptr<Signal> > sigs(session_.signals());
-
-       set< shared_ptr<Trace> > traces(sigs.begin(), sigs.end());
-
-#ifdef ENABLE_DECODE
-       const vector< shared_ptr<DecodeTrace> > decode_traces(
-               session().get_decode_signals());
-       traces.insert(decode_traces.begin(), decode_traces.end());
-#endif
-
-       set< shared_ptr<Trace> > add_traces;
-       set_difference(traces.begin(), traces.end(),
-               prev_traces.begin(), prev_traces.end(),
-               inserter(add_traces, add_traces.begin()));
-
-       set< shared_ptr<Trace> > remove_traces;
-       set_difference(prev_traces.begin(), prev_traces.end(),
-               traces.begin(), traces.end(),
-               inserter(remove_traces, remove_traces.begin()));
-
-       // Make a look-up table of sigrok Channels to pulseview Signals
-       unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
-               signal_map;
-       for (const shared_ptr<Signal> &sig : sigs)
-               signal_map[sig->channel()] = sig;
-
-       // Populate channel groups
-       for (auto entry : sr_dev->channel_groups()) {
-               const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
-
-               if (group->channels().size() <= 1)
-                       continue;
-
-               // Find best trace group to add to
-               TraceTreeItemOwner *owner = find_prevalent_trace_group(
-                       group, signal_map);
-
-               // If there is no trace group, create one
-               shared_ptr<TraceGroup> new_trace_group;
-               if (!owner) {
-                       new_trace_group.reset(new TraceGroup());
-                       owner = new_trace_group.get();
-               }
-
-               // Extract traces for the trace group, removing them from
-               // the add list
-               const vector< shared_ptr<Trace> > new_traces_in_group =
-                       extract_new_traces_for_channels(group->channels(),
-                               signal_map, add_traces);
-
-               // Add the traces to the group
-               const pair<int, int> prev_v_extents = owner->v_extents();
-               int offset = prev_v_extents.second - prev_v_extents.first;
-               for (shared_ptr<Trace> trace : new_traces_in_group) {
-                       assert(trace);
-                       owner->add_child_item(trace);
-
-                       const pair<int, int> extents = trace->v_extents();
-                       if (trace->enabled())
-                               offset += -extents.first;
-                       trace->force_to_v_offset(offset);
-                       if (trace->enabled())
-                               offset += extents.second;
-               }
-
-               // Assign proper vertical offsets to each channel in the group
-               new_trace_group->restack_items();
-
-               // If this is a new group, enqueue it in the new top level
-               // items list
-               if (!new_traces_in_group.empty() && new_trace_group)
-                       new_top_level_items.push_back(new_trace_group);
-       }
-
-       // Enqueue the remaining logic channels in a group
-       vector< shared_ptr<Channel> > logic_channels;
-       copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
-               [](const shared_ptr<Channel>& c) {
-                       return c->type() == sigrok::ChannelType::LOGIC; });
-
-       const vector< shared_ptr<Trace> > non_grouped_logic_signals =
-               extract_new_traces_for_channels(logic_channels, signal_map, add_traces);
-
-       if (non_grouped_logic_signals.size() > 0) {
-               const shared_ptr<TraceGroup> non_grouped_trace_group(
-                       make_shared<TraceGroup>());
-               for (shared_ptr<Trace> trace : non_grouped_logic_signals)
-                       non_grouped_trace_group->add_child_item(trace);
-
-               non_grouped_trace_group->restack_items();
-               new_top_level_items.push_back(non_grouped_trace_group);
-       }
-
-       // Enqueue the remaining channels as free ungrouped traces
-       const vector< shared_ptr<Trace> > new_top_level_signals =
-               extract_new_traces_for_channels(channels, signal_map, add_traces);
-       new_top_level_items.insert(new_top_level_items.end(),
-               new_top_level_signals.begin(), new_top_level_signals.end());
-
-       // Enqueue any remaining traces i.e. decode traces
-       new_top_level_items.insert(new_top_level_items.end(),
-               add_traces.begin(), add_traces.end());
-
-       // Remove any removed traces
-       for (shared_ptr<Trace> trace : remove_traces) {
-               TraceTreeItemOwner *const owner = trace->owner();
-               assert(owner);
-               owner->remove_child_item(trace);
-       }
-
-       // Add and position the pending top levels items
-       for (auto item : new_top_level_items) {
-               // Position the item after the last item or at the top if there is none
-               int offset = v_extents().second;
-
-               add_child_item(item);
-               item->force_to_v_offset(offset);
-
-               const pair<int, int> extents = item->v_extents();
-               if (item->enabled())
-                       offset += (extents.second - extents.first);
-       }
-
-       update_layout();
-
-       header_->update();
-       viewport_->update();
-}
-
-void View::capture_state_updated(int state)
-{
-       if (state == Session::Running) {
-               set_time_unit(util::TimeUnit::Samples);
-
-               trigger_markers_.clear();
-       }
-
-       if (state == Session::Stopped) {
-               // After acquisition has stopped we need to re-calculate the ticks once
-               // as it's otherwise done when the user pans or zooms, which is too late
-               calculate_tick_spacing();
-
-               // Reset "always zoom to fit", the acquisition has stopped
-               if (always_zoom_to_fit_) {
-                       always_zoom_to_fit_ = false;
-                       always_zoom_to_fit_changed(false);
-               }
-       }
-}
-
-void View::data_updated()
-{
-       if (always_zoom_to_fit_ || sticky_scrolling_) {
-               if (!delayed_view_updater_.isActive())
-                       delayed_view_updater_.start();
-       } else {
-               determine_time_unit();
-               update_scroll();
-               ruler_->update();
-               viewport_->update();
-       }
-}
-
-void View::perform_delayed_view_update()
-{
-       if (always_zoom_to_fit_)
-               zoom_fit(true);
-
-       if (sticky_scrolling_) {
-               // Make right side of the view sticky
-               double length = 0;
-               Timestamp offset;
-               get_scroll_layout(length, offset);
-
-               const QSize areaSize = viewport_->size();
-               length = max(length - areaSize.width(), 0.0);
-
-               set_offset(scale_ * length);
-       }
-
-       determine_time_unit();
-       update_scroll();
-       ruler_->update();
-       viewport_->update();
-}
-
-void View::process_sticky_events()
-{
-       if (sticky_events_ & TraceTreeItemHExtentsChanged)
-               update_layout();
-       if (sticky_events_ & TraceTreeItemVExtentsChanged) {
-               restack_all_trace_tree_items();
-               update_scroll();
-       }
-
-       // Clear the sticky events
-       sticky_events_ = 0;
-}
-
-void View::on_hover_point_changed()
-{
-       const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
-               list_by_type<TraceTreeItem>());
-       for (shared_ptr<TraceTreeItem> r : trace_tree_items)
-               r->hover_point_changed();
-}
-
-} // namespace view
-} // namespace pv