[pulseview.git] / pv / view / view.cpp

/*
 * 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 <cassert>
#include <climits>
#include <cmath>
#include <mutex>
#include <unordered_set>

#include <QApplication>
#include <QEvent>
#include <QFontMetrics>
#include <QMouseEvent>
#include <QScrollBar>

#include <libsigrok/libsigrok.hpp>

#include "decodetrace.hpp"
#include "header.hpp"
#include "logicsignal.hpp"
#include "ruler.hpp"
#include "signal.hpp"
#include "tracegroup.hpp"
#include "view.hpp"
#include "viewport.hpp"

#include "pv/session.hpp"
#include "pv/data/logic.hpp"
#include "pv/data/logicsegment.hpp"
#include "pv/util.hpp"

using boost::shared_lock;
using boost::shared_mutex;

using pv::data::SignalData;
using pv::data::Segment;
using pv::util::format_time;

using std::deque;
using std::dynamic_pointer_cast;
using std::list;
using std::lock_guard;
using std::max;
using std::make_pair;
using std::min;
using std::pair;
using std::set;
using std::shared_ptr;
using std::unordered_map;
using std::unordered_set;
using std::vector;
using std::weak_ptr;

namespace pv {
namespace view {

const double View::MaxScale = 1e9;
const double View::MinScale = 1e-15;

const int View::MaxScrollValue = INT_MAX / 2;

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-6),
	offset_(0),
	updating_scroll_(false),
	tick_period_(0.0),
	tick_prefix_(0),
	show_cursors_(false),
	cursors_(new CursorPair(*this)),
	next_flag_text_('A'),
	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(data_updated()));
	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);

	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());
	return items;
}

double View::scale() const
{
	return scale_;
}

double View::offset() const
{
	return offset_;
}

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;
}

unsigned int View::tick_prefix() const
{
	return tick_prefix_;
}

double View::tick_period() const
{
	return tick_period_;
}

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()
{
	const pair<double, double> extents = get_time_extents();
	const double delta = extents.second - extents.first;
	if (delta < 1e-12)
		return;

	assert(viewport_);
	const int w = viewport_->width();
	if (w <= 0)
		return;

	const double scale = max(min(delta / w, MaxScale), MinScale);
	set_scale_offset(scale, 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;

	double samplerate = 0.0;
	for (const shared_ptr<SignalData> d : visible_data) {
		assert(d);
		const vector< shared_ptr<Segment> > segments =
			d->segments();
		for (const shared_ptr<Segment> &s : segments)
			samplerate = max(samplerate, s->samplerate());
	}

	if (samplerate == 0.0)
		return;

	assert(viewport_);
	const int w = viewport_->width();
	if (w <= 0)
		return;

	set_zoom(1.0 / samplerate, w / 2);
}

void View::set_scale_offset(double scale, double offset)
{
	scale_ = scale;
	offset_ = offset;

	calculate_tick_spacing();

	update_scroll();
	ruler_->update();
	viewport_->update();
	scale_offset_changed();
}

set< shared_ptr<SignalData> > View::get_visible_data() const
{
	shared_lock<shared_mutex> lock(session().signals_mutex());
	const vector< 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<double, double> View::get_time_extents() const
{
	double left_time = DBL_MAX, right_time = DBL_MIN;
	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 double start_time = s->start_time();
			left_time = min(left_time, start_time);
			right_time = max(right_time, start_time +
				d->get_max_sample_count() / samplerate);
		}
	}

	if (left_time == DBL_MAX && right_time == DBL_MIN)
		return make_pair(0.0, 0.0);

	assert(left_time < right_time);
	return make_pair(left_time, right_time);
}

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(double 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_row_items()
{
	// Make a set of owners
	unordered_set< RowItemOwner* > owners;
	for (const auto &r : *this)
		owners.insert(r->owner());

	// Make a list that is sorted from deepest first
	vector< RowItemOwner* > sorted_owners(owners.begin(), owners.end());
	sort(sorted_owners.begin(), sorted_owners.end(),
		[](const RowItemOwner* a, const RowItemOwner *b) {
			return a->depth() > b->depth(); });

	// Restack the items recursively
	for (auto &o : sorted_owners)
		o->restack_items();

	// Animate the items to their destination
	for (const auto &r : *this)
		r->animate_to_layout_v_offset();
}

void View::get_scroll_layout(double &length, double &offset) const
{
	const pair<double, double> extents = get_time_extents();
	length = (extents.second - extents.first) / scale_;
	offset = offset_ / scale_;
}

void View::set_zoom(double scale, int offset)
{
	const double cursor_offset = offset_ + scale_ * offset;
	const double new_scale = max(min(scale, MaxScale), MinScale);
	const double new_offset = cursor_offset - new_scale * offset;
	set_scale_offset(new_scale, new_offset);
}

void View::calculate_tick_spacing()
{
	const double SpacingIncrement = 32.0f;
	const double MinValueSpacing = 32.0f;

	double min_width = SpacingIncrement, typical_width;

	QFontMetrics m(QApplication::font());

	do {
		const double min_period = scale_ * min_width;

		const int order = (int)floorf(log10f(min_period));
		const double order_decimal = pow(10.0, order);

		unsigned int unit = 0;

		do {
			tick_period_ = order_decimal * ScaleUnits[unit++];
		} while (tick_period_ < min_period &&
			unit < countof(ScaleUnits));

		tick_prefix_ = (order - pv::util::FirstSIPrefixPower) / 3;

		typical_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
			Qt::AlignLeft | Qt::AlignTop,
			format_time(offset_, tick_prefix_)).width() +
				MinValueSpacing;

		min_width += SpacingIncrement;

	} while(typical_width > tick_period_ / scale_);
}

void View::update_scroll()
{
	assert(viewport_);

	const QSize areaSize = viewport_->size();

	// Set the horizontal scroll bar
	double length = 0, offset = 0;
	get_scroll_layout(length, offset);
	length = max(length - areaSize.width(), 0.0);

	int major_tick_distance = tick_period_ / scale_;

	horizontalScrollBar()->setPageStep(areaSize.width() / 2);
	horizontalScrollBar()->setSingleStep(major_tick_distance);

	updating_scroll_ = true;

	if (length < MaxScrollValue) {
		horizontalScrollBar()->setRange(0, length);
		horizontalScrollBar()->setSliderPosition(offset);
	} else {
		horizontalScrollBar()->setRange(0, MaxScrollValue);
		horizontalScrollBar()->setSliderPosition(
			offset_ * MaxScrollValue / (scale_ * length));
	}

	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();
}

bool View::add_channels_to_owner(
	const vector< shared_ptr<sigrok::Channel> > &channels,
	RowItemOwner *owner, int &offset,
	unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
		&signal_map,
	std::function<bool (shared_ptr<RowItem>)> filter_func)
{
	bool any_added = false;

	assert(owner);

	for (const auto &channel : channels)
	{
		const auto iter = signal_map.find(channel);
		if (iter == signal_map.end() ||
			(filter_func && !filter_func((*iter).second)))
			continue;

		shared_ptr<RowItem> row_item = (*iter).second;
		owner->add_child_item(row_item);
		apply_offset(row_item, offset);
		signal_map.erase(iter);

		any_added = true;
	}

	return any_added;
}

void View::apply_offset(shared_ptr<RowItem> row_item, int &offset) {
	assert(row_item);
	const pair<int, int> extents = row_item->v_extents();
	if (row_item->enabled())
		offset += -extents.first;
	row_item->force_to_v_offset(offset);
	if (row_item->enabled())
		offset += extents.second;
}

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 *e)
{
	switch(e->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(e);
	}
}

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 ? RowItemHExtentsChanged : 0) |
		(vert ? RowItemVExtentsChanged : 0);
	lazy_event_handler_.start();
}

void View::h_scroll_value_changed(int value)
{
	if (updating_scroll_)
		return;

	const int range = horizontalScrollBar()->maximum();
	if (range < MaxScrollValue)
		offset_ = scale_ * value;
	else {
		double length = 0, offset;
		get_scroll_layout(length, offset);
		offset_ = scale_ * length * value / MaxScrollValue;
	}

	ruler_->update();
	viewport_->update();
}

void View::v_scroll_value_changed()
{
	header_->update();
	viewport_->update();
}

void View::signals_changed()
{
	int offset = 0;

	// Populate the traces
	clear_child_items();

	shared_ptr<sigrok::Device> device = session_.device();
	assert(device);

	// Collect a set of signals
	unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
		signal_map;

	shared_lock<shared_mutex> lock(session_.signals_mutex());
	const vector< shared_ptr<Signal> > &sigs(session_.signals());

	for (const shared_ptr<Signal> &sig : sigs)
		signal_map[sig->channel()] = sig;

	// Populate channel groups
	for (auto entry : device->channel_groups())
	{
		const shared_ptr<sigrok::ChannelGroup> &group = entry.second;

		if (group->channels().size() <= 1)
			continue;

		shared_ptr<TraceGroup> trace_group(new TraceGroup());
		int child_offset = 0;
		if (add_channels_to_owner(group->channels(),
			trace_group.get(), child_offset, signal_map))
		{
			add_child_item(trace_group);
			apply_offset(trace_group, offset);
		}
	}

	// Add the remaining logic channels
	shared_ptr<TraceGroup> logic_trace_group(new TraceGroup());
	int child_offset = 0;

	if (add_channels_to_owner(device->channels(),
		logic_trace_group.get(), child_offset, signal_map,
		[](shared_ptr<RowItem> r) -> bool {
			return dynamic_pointer_cast<LogicSignal>(r) != nullptr;
			}))

	{
		add_child_item(logic_trace_group);
		apply_offset(logic_trace_group, offset);
	}

	// Add the remaining channels
	add_channels_to_owner(device->channels(), this, offset, signal_map);
	assert(signal_map.empty());

	// Add decode signals
#ifdef ENABLE_DECODE
	const vector< shared_ptr<DecodeTrace> > decode_sigs(
		session().get_decode_signals());
	for (auto s : decode_sigs) {
		add_child_item(s);
		apply_offset(s, offset);
	}
#endif

	update_layout();
}

void View::data_updated()
{
	// Update the scroll bars
	update_scroll();

	// Repaint the view
	viewport_->update();
}

void View::process_sticky_events()
{
	if (sticky_events_ & RowItemHExtentsChanged)
		update_layout();
	if (sticky_events_ & RowItemVExtentsChanged) {
		restack_all_row_items();
		update_scroll();
	}

	// Clear the sticky events
	sticky_events_ = 0;
}

void View::on_hover_point_changed()
{
	for (shared_ptr<RowItem> r : *this)
		r->hover_point_changed();
}

} // namespace view
} // namespace pv
Commit	Line	Data
	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 "decodetrace.hpp"
	42	#include "header.hpp"
	43	#include "logicsignal.hpp"
	44	#include "ruler.hpp"
	45	#include "signal.hpp"
	46	#include "tracegroup.hpp"
	47	#include "view.hpp"
	48	#include "viewport.hpp"
	49
	50	#include "pv/session.hpp"
	51	#include "pv/data/logic.hpp"
	52	#include "pv/data/logicsegment.hpp"
	53	#include "pv/util.hpp"
	54
	55	using boost::shared_lock;
	56	using boost::shared_mutex;
	57
	58	using pv::data::SignalData;
	59	using pv::data::Segment;
	60	using pv::util::format_time;
	61
	62	using std::deque;
	63	using std::dynamic_pointer_cast;
	64	using std::list;
	65	using std::lock_guard;
	66	using std::max;
	67	using std::make_pair;
	68	using std::min;
	69	using std::pair;
	70	using std::set;
	71	using std::shared_ptr;
	72	using std::unordered_map;
	73	using std::unordered_set;
	74	using std::vector;
	75	using std::weak_ptr;
	76
	77	namespace pv {
	78	namespace view {
	79
	80	const double View::MaxScale = 1e9;
	81	const double View::MinScale = 1e-15;
	82
	83	const int View::MaxScrollValue = INT_MAX / 2;
	84
	85	const int View::ScaleUnits[3] = {1, 2, 5};
	86
	87	View::View(Session &session, QWidget *parent) :
	88	QAbstractScrollArea(parent),
	89	session_(session),
	90	viewport_(new Viewport(*this)),
	91	ruler_(new Ruler(*this)),
	92	header_(new Header(*this)),
	93	scale_(1e-6),
	94	offset_(0),
	95	updating_scroll_(false),
	96	tick_period_(0.0),
	97	tick_prefix_(0),
	98	show_cursors_(false),
	99	cursors_(new CursorPair(*this)),
	100	next_flag_text_('A'),
	101	hover_point_(-1, -1)
	102	{
	103	connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
	104	this, SLOT(h_scroll_value_changed(int)));
	105	connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
	106	this, SLOT(v_scroll_value_changed()));
	107
	108	connect(&session_, SIGNAL(signals_changed()),
	109	this, SLOT(signals_changed()));
	110	connect(&session_, SIGNAL(capture_state_changed(int)),
	111	this, SLOT(data_updated()));
	112	connect(&session_, SIGNAL(data_received()),
	113	this, SLOT(data_updated()));
	114	connect(&session_, SIGNAL(frame_ended()),
	115	this, SLOT(data_updated()));
	116
	117	connect(header_, SIGNAL(selection_changed()),
	118	ruler_, SLOT(clear_selection()));
	119	connect(ruler_, SIGNAL(selection_changed()),
	120	header_, SLOT(clear_selection()));
	121
	122	connect(header_, SIGNAL(selection_changed()),
	123	this, SIGNAL(selection_changed()));
	124	connect(ruler_, SIGNAL(selection_changed()),
	125	this, SIGNAL(selection_changed()));
	126
	127	connect(this, SIGNAL(hover_point_changed()),
	128	this, SLOT(on_hover_point_changed()));
	129
	130	connect(&lazy_event_handler_, SIGNAL(timeout()),
	131	this, SLOT(process_sticky_events()));
	132	lazy_event_handler_.setSingleShot(true);
	133
	134	setViewport(viewport_);
	135
	136	viewport_->installEventFilter(this);
	137	ruler_->installEventFilter(this);
	138	header_->installEventFilter(this);
	139
	140	// Trigger the initial event manually. The default device has signals
	141	// which were created before this object came into being
	142	signals_changed();
	143
	144	// make sure the transparent widgets are on the top
	145	ruler_->raise();
	146	header_->raise();
	147
	148	// Update the zoom state
	149	calculate_tick_spacing();
	150	}
	151
	152	Session& View::session()
	153	{
	154	return session_;
	155	}
	156
	157	const Session& View::session() const
	158	{
	159	return session_;
	160	}
	161
	162	View* View::view()
	163	{
	164	return this;
	165	}
	166
	167	const View* View::view() const
	168	{
	169	return this;
	170	}
	171
	172	Viewport* View::viewport()
	173	{
	174	return viewport_;
	175	}
	176
	177	const Viewport* View::viewport() const
	178	{
	179	return viewport_;
	180	}
	181
	182	vector< shared_ptr<TimeItem> > View::time_items() const
	183	{
	184	const vector<shared_ptr<Flag>> f(flags());
	185	vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
	186	items.push_back(cursors_);
	187	items.push_back(cursors_->first());
	188	items.push_back(cursors_->second());
	189	return items;
	190	}
	191
	192	double View::scale() const
	193	{
	194	return scale_;
	195	}
	196
	197	double View::offset() const
	198	{
	199	return offset_;
	200	}
	201
	202	int View::owner_visual_v_offset() const
	203	{
	204	return -verticalScrollBar()->sliderPosition();
	205	}
	206
	207	void View::set_v_offset(int offset)
	208	{
	209	verticalScrollBar()->setSliderPosition(offset);
	210	header_->update();
	211	viewport_->update();
	212	}
	213
	214	unsigned int View::depth() const
	215	{
	216	return 0;
	217	}
	218
	219	unsigned int View::tick_prefix() const
	220	{
	221	return tick_prefix_;
	222	}
	223
	224	double View::tick_period() const
	225	{
	226	return tick_period_;
	227	}
	228
	229	void View::zoom(double steps)
	230	{
	231	zoom(steps, viewport_->width() / 2);
	232	}
	233
	234	void View::zoom(double steps, int offset)
	235	{
	236	set_zoom(scale_ * pow(3.0/2.0, -steps), offset);
	237	}
	238
	239	void View::zoom_fit()
	240	{
	241	const pair<double, double> extents = get_time_extents();
	242	const double delta = extents.second - extents.first;
	243	if (delta < 1e-12)
	244	return;
	245
	246	assert(viewport_);
	247	const int w = viewport_->width();
	248	if (w <= 0)
	249	return;
	250
	251	const double scale = max(min(delta / w, MaxScale), MinScale);
	252	set_scale_offset(scale, extents.first);
	253	}
	254
	255	void View::zoom_one_to_one()
	256	{
	257	using pv::data::SignalData;
	258
	259	// Make a set of all the visible data objects
	260	set< shared_ptr<SignalData> > visible_data = get_visible_data();
	261	if (visible_data.empty())
	262	return;
	263
	264	double samplerate = 0.0;
	265	for (const shared_ptr<SignalData> d : visible_data) {
	266	assert(d);
	267	const vector< shared_ptr<Segment> > segments =
	268	d->segments();
	269	for (const shared_ptr<Segment> &s : segments)
	270	samplerate = max(samplerate, s->samplerate());
	271	}
	272
	273	if (samplerate == 0.0)
	274	return;
	275
	276	assert(viewport_);
	277	const int w = viewport_->width();
	278	if (w <= 0)
	279	return;
	280
	281	set_zoom(1.0 / samplerate, w / 2);
	282	}
	283
	284	void View::set_scale_offset(double scale, double offset)
	285	{
	286	scale_ = scale;
	287	offset_ = offset;
	288
	289	calculate_tick_spacing();
	290
	291	update_scroll();
	292	ruler_->update();
	293	viewport_->update();
	294	scale_offset_changed();
	295	}
	296
	297	set< shared_ptr<SignalData> > View::get_visible_data() const
	298	{
	299	shared_lock<shared_mutex> lock(session().signals_mutex());
	300	const vector< shared_ptr<Signal> > &sigs(session().signals());
	301
	302	// Make a set of all the visible data objects
	303	set< shared_ptr<SignalData> > visible_data;
	304	for (const shared_ptr<Signal> sig : sigs)
	305	if (sig->enabled())
	306	visible_data.insert(sig->data());
	307
	308	return visible_data;
	309	}
	310
	311	pair<double, double> View::get_time_extents() const
	312	{
	313	double left_time = DBL_MAX, right_time = DBL_MIN;
	314	const set< shared_ptr<SignalData> > visible_data = get_visible_data();
	315	for (const shared_ptr<SignalData> d : visible_data)
	316	{
	317	const vector< shared_ptr<Segment> > segments =
	318	d->segments();
	319	for (const shared_ptr<Segment> &s : segments) {
	320	double samplerate = s->samplerate();
	321	samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
	322
	323	const double start_time = s->start_time();
	324	left_time = min(left_time, start_time);
	325	right_time = max(right_time, start_time +
	326	d->get_max_sample_count() / samplerate);
	327	}
	328	}
	329
	330	if (left_time == DBL_MAX && right_time == DBL_MIN)
	331	return make_pair(0.0, 0.0);
	332
	333	assert(left_time < right_time);
	334	return make_pair(left_time, right_time);
	335	}
	336
	337	bool View::cursors_shown() const
	338	{
	339	return show_cursors_;
	340	}
	341
	342	void View::show_cursors(bool show)
	343	{
	344	show_cursors_ = show;
	345	ruler_->update();
	346	viewport_->update();
	347	}
	348
	349	void View::centre_cursors()
	350	{
	351	const double time_width = scale_ * viewport_->width();
	352	cursors_->first()->set_time(offset_ + time_width * 0.4);
	353	cursors_->second()->set_time(offset_ + time_width * 0.6);
	354	ruler_->update();
	355	viewport_->update();
	356	}
	357
	358	std::shared_ptr<CursorPair> View::cursors() const
	359	{
	360	return cursors_;
	361	}
	362
	363	void View::add_flag(double time)
	364	{
	365	flags_.push_back(shared_ptr<Flag>(new Flag(*this, time,
	366	QString("%1").arg(next_flag_text_))));
	367	next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
	368	(next_flag_text_ + 1);
	369	time_item_appearance_changed(true, true);
	370	}
	371
	372	void View::remove_flag(std::shared_ptr<Flag> flag)
	373	{
	374	flags_.remove(flag);
	375	time_item_appearance_changed(true, true);
	376	}
	377
	378	vector< std::shared_ptr<Flag> > View::flags() const
	379	{
	380	vector< std::shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
	381	stable_sort(flags.begin(), flags.end(),
	382	[](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
	383	return a->time() < b->time();
	384	});
	385
	386	return flags;
	387	}
	388
	389	const QPoint& View::hover_point() const
	390	{
	391	return hover_point_;
	392	}
	393
	394	void View::update_viewport()
	395	{
	396	assert(viewport_);
	397	viewport_->update();
	398	header_->update();
	399	}
	400
	401	void View::restack_all_row_items()
	402	{
	403	// Make a set of owners
	404	unordered_set< RowItemOwner* > owners;
	405	for (const auto &r : *this)
	406	owners.insert(r->owner());
	407
	408	// Make a list that is sorted from deepest first
	409	vector< RowItemOwner* > sorted_owners(owners.begin(), owners.end());
	410	sort(sorted_owners.begin(), sorted_owners.end(),
	411	[](const RowItemOwner* a, const RowItemOwner *b) {
	412	return a->depth() > b->depth(); });
	413
	414	// Restack the items recursively
	415	for (auto &o : sorted_owners)
	416	o->restack_items();
	417
	418	// Animate the items to their destination
	419	for (const auto &r : *this)
	420	r->animate_to_layout_v_offset();
	421	}
	422
	423	void View::get_scroll_layout(double &length, double &offset) const
	424	{
	425	const pair<double, double> extents = get_time_extents();
	426	length = (extents.second - extents.first) / scale_;
	427	offset = offset_ / scale_;
	428	}
	429
	430	void View::set_zoom(double scale, int offset)
	431	{
	432	const double cursor_offset = offset_ + scale_ * offset;
	433	const double new_scale = max(min(scale, MaxScale), MinScale);
	434	const double new_offset = cursor_offset - new_scale * offset;
	435	set_scale_offset(new_scale, new_offset);
	436	}
	437
	438	void View::calculate_tick_spacing()
	439	{
	440	const double SpacingIncrement = 32.0f;
	441	const double MinValueSpacing = 32.0f;
	442
	443	double min_width = SpacingIncrement, typical_width;
	444
	445	QFontMetrics m(QApplication::font());
	446
	447	do {
	448	const double min_period = scale_ * min_width;
	449
	450	const int order = (int)floorf(log10f(min_period));
	451	const double order_decimal = pow(10.0, order);
	452
	453	unsigned int unit = 0;
	454
	455	do {
	456	tick_period_ = order_decimal * ScaleUnits[unit++];
	457	} while (tick_period_ < min_period &&
	458	unit < countof(ScaleUnits));
	459
	460	tick_prefix_ = (order - pv::util::FirstSIPrefixPower) / 3;
	461
	462	typical_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
	463	Qt::AlignLeft \| Qt::AlignTop,
	464	format_time(offset_, tick_prefix_)).width() +
	465	MinValueSpacing;
	466
	467	min_width += SpacingIncrement;
	468
	469	} while(typical_width > tick_period_ / scale_);
	470	}
	471
	472	void View::update_scroll()
	473	{
	474	assert(viewport_);
	475
	476	const QSize areaSize = viewport_->size();
	477
	478	// Set the horizontal scroll bar
	479	double length = 0, offset = 0;
	480	get_scroll_layout(length, offset);
	481	length = max(length - areaSize.width(), 0.0);
	482
	483	int major_tick_distance = tick_period_ / scale_;
	484
	485	horizontalScrollBar()->setPageStep(areaSize.width() / 2);
	486	horizontalScrollBar()->setSingleStep(major_tick_distance);
	487
	488	updating_scroll_ = true;
	489
	490	if (length < MaxScrollValue) {
	491	horizontalScrollBar()->setRange(0, length);
	492	horizontalScrollBar()->setSliderPosition(offset);
	493	} else {
	494	horizontalScrollBar()->setRange(0, MaxScrollValue);
	495	horizontalScrollBar()->setSliderPosition(
	496	offset_ * MaxScrollValue / (scale_ * length));
	497	}
	498
	499	updating_scroll_ = false;
	500
	501	// Set the vertical scrollbar
	502	verticalScrollBar()->setPageStep(areaSize.height());
	503	verticalScrollBar()->setSingleStep(areaSize.height() / 8);
	504
	505	const pair<int, int> extents = v_extents();
	506	verticalScrollBar()->setRange(extents.first - (areaSize.height() / 2),
	507	extents.second - (areaSize.height() / 2));
	508	}
	509
	510	void View::update_layout()
	511	{
	512	setViewportMargins(
	513	header_->sizeHint().width() - pv::view::Header::BaselineOffset,
	514	ruler_->sizeHint().height(), 0, 0);
	515	ruler_->setGeometry(viewport_->x(), 0,
	516	viewport_->width(), ruler_->extended_size_hint().height());
	517	header_->setGeometry(0, viewport_->y(),
	518	header_->extended_size_hint().width(), viewport_->height());
	519	update_scroll();
	520	}
	521
	522	void View::paint_label(QPainter &p, const QRect &rect, bool hover)
	523	{
	524	(void)p;
	525	(void)rect;
	526	(void)hover;
	527	}
	528
	529	QRectF View::label_rect(const QRectF &rect)
	530	{
	531	(void)rect;
	532	return QRectF();
	533	}
	534
	535	bool View::add_channels_to_owner(
	536	const vector< shared_ptr<sigrok::Channel> > &channels,
	537	RowItemOwner *owner, int &offset,
	538	unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
	539	&signal_map,
	540	std::function<bool (shared_ptr<RowItem>)> filter_func)
	541	{
	542	bool any_added = false;
	543
	544	assert(owner);
	545
	546	for (const auto &channel : channels)
	547	{
	548	const auto iter = signal_map.find(channel);
	549	if (iter == signal_map.end() \|\|
	550	(filter_func && !filter_func((*iter).second)))
	551	continue;
	552
	553	shared_ptr<RowItem> row_item = (*iter).second;
	554	owner->add_child_item(row_item);
	555	apply_offset(row_item, offset);
	556	signal_map.erase(iter);
	557
	558	any_added = true;
	559	}
	560
	561	return any_added;
	562	}
	563
	564	void View::apply_offset(shared_ptr<RowItem> row_item, int &offset) {
	565	assert(row_item);
	566	const pair<int, int> extents = row_item->v_extents();
	567	if (row_item->enabled())
	568	offset += -extents.first;
	569	row_item->force_to_v_offset(offset);
	570	if (row_item->enabled())
	571	offset += extents.second;
	572	}
	573
	574	bool View::eventFilter(QObject object, QEvent event)
	575	{
	576	const QEvent::Type type = event->type();
	577	if (type == QEvent::MouseMove) {
	578
	579	const QMouseEvent const mouse_event = (QMouseEvent)event;
	580	if (object == viewport_)
	581	hover_point_ = mouse_event->pos();
	582	else if (object == ruler_)
	583	hover_point_ = QPoint(mouse_event->x(), 0);
	584	else if (object == header_)
	585	hover_point_ = QPoint(0, mouse_event->y());
	586	else
	587	hover_point_ = QPoint(-1, -1);
	588
	589	hover_point_changed();
	590
	591	} else if (type == QEvent::Leave) {
	592	hover_point_ = QPoint(-1, -1);
	593	hover_point_changed();
	594	}
	595
	596	return QObject::eventFilter(object, event);
	597	}
	598
	599	bool View::viewportEvent(QEvent *e)
	600	{
	601	switch(e->type()) {
	602	case QEvent::Paint:
	603	case QEvent::MouseButtonPress:
	604	case QEvent::MouseButtonRelease:
	605	case QEvent::MouseButtonDblClick:
	606	case QEvent::MouseMove:
	607	case QEvent::Wheel:
	608	case QEvent::TouchBegin:
	609	case QEvent::TouchUpdate:
	610	case QEvent::TouchEnd:
	611	return false;
	612
	613	default:
	614	return QAbstractScrollArea::viewportEvent(e);
	615	}
	616	}
	617
	618	void View::resizeEvent(QResizeEvent*)
	619	{
	620	update_layout();
	621	}
	622
	623	void View::row_item_appearance_changed(bool label, bool content)
	624	{
	625	if (label)
	626	header_->update();
	627	if (content)
	628	viewport_->update();
	629	}
	630
	631	void View::time_item_appearance_changed(bool label, bool content)
	632	{
	633	if (label)
	634	ruler_->update();
	635	if (content)
	636	viewport_->update();
	637	}
	638
	639	void View::extents_changed(bool horz, bool vert)
	640	{
	641	sticky_events_ \|=
	642	(horz ? RowItemHExtentsChanged : 0) \|
	643	(vert ? RowItemVExtentsChanged : 0);
	644	lazy_event_handler_.start();
	645	}
	646
	647	void View::h_scroll_value_changed(int value)
	648	{
	649	if (updating_scroll_)
	650	return;
	651
	652	const int range = horizontalScrollBar()->maximum();
	653	if (range < MaxScrollValue)
	654	offset_ = scale_ * value;
	655	else {
	656	double length = 0, offset;
	657	get_scroll_layout(length, offset);
	658	offset_ = scale_ * length * value / MaxScrollValue;
	659	}
	660
	661	ruler_->update();
	662	viewport_->update();
	663	}
	664
	665	void View::v_scroll_value_changed()
	666	{
	667	header_->update();
	668	viewport_->update();
	669	}
	670
	671	void View::signals_changed()
	672	{
	673	int offset = 0;
	674
	675	// Populate the traces
	676	clear_child_items();
	677
	678	shared_ptr<sigrok::Device> device = session_.device();
	679	assert(device);
	680
	681	// Collect a set of signals
	682	unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
	683	signal_map;
	684
	685	shared_lock<shared_mutex> lock(session_.signals_mutex());
	686	const vector< shared_ptr<Signal> > &sigs(session_.signals());
	687
	688	for (const shared_ptr<Signal> &sig : sigs)
	689	signal_map[sig->channel()] = sig;
	690
	691	// Populate channel groups
	692	for (auto entry : device->channel_groups())
	693	{
	694	const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
	695
	696	if (group->channels().size() <= 1)
	697	continue;
	698
	699	shared_ptr<TraceGroup> trace_group(new TraceGroup());
	700	int child_offset = 0;
	701	if (add_channels_to_owner(group->channels(),
	702	trace_group.get(), child_offset, signal_map))
	703	{
	704	add_child_item(trace_group);
	705	apply_offset(trace_group, offset);
	706	}
	707	}
	708
	709	// Add the remaining logic channels
	710	shared_ptr<TraceGroup> logic_trace_group(new TraceGroup());
	711	int child_offset = 0;
	712
	713	if (add_channels_to_owner(device->channels(),
	714	logic_trace_group.get(), child_offset, signal_map,
	715	[](shared_ptr<RowItem> r) -> bool {
	716	return dynamic_pointer_cast<LogicSignal>(r) != nullptr;
	717	}))
	718
	719	{
	720	add_child_item(logic_trace_group);
	721	apply_offset(logic_trace_group, offset);
	722	}
	723
	724	// Add the remaining channels
	725	add_channels_to_owner(device->channels(), this, offset, signal_map);
	726	assert(signal_map.empty());
	727
	728	// Add decode signals
	729	#ifdef ENABLE_DECODE
	730	const vector< shared_ptr<DecodeTrace> > decode_sigs(
	731	session().get_decode_signals());
	732	for (auto s : decode_sigs) {
	733	add_child_item(s);
	734	apply_offset(s, offset);
	735	}
	736	#endif
	737
	738	update_layout();
	739	}
	740
	741	void View::data_updated()
	742	{
	743	// Update the scroll bars
	744	update_scroll();
	745
	746	// Repaint the view
	747	viewport_->update();
	748	}
	749
	750	void View::process_sticky_events()
	751	{
	752	if (sticky_events_ & RowItemHExtentsChanged)
	753	update_layout();
	754	if (sticky_events_ & RowItemVExtentsChanged) {
	755	restack_all_row_items();
	756	update_scroll();
	757	}
	758
	759	// Clear the sticky events
	760	sticky_events_ = 0;
	761	}
	762
	763	void View::on_hover_point_changed()
	764	{
	765	for (shared_ptr<RowItem> r : *this)
	766	r->hover_point_changed();
	767	}
	768
	769	} // namespace view
	770	} // namespace pv