[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 "cursorheader.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::back_inserter;
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};

const QColor View::CursorAreaColour(220, 231, 243);

const QSizeF View::LabelPadding(4, 0);

View::View(Session &session, QWidget *parent) :
	QAbstractScrollArea(parent),
	session_(session),
	viewport_(new Viewport(*this)),
	ruler_(new Ruler(*this)),
	cursorheader_(new CursorHeader(*this)),
	header_(new Header(*this)),
	scale_(1e-6),
	offset_(0),
	v_offset_(0),
	updating_scroll_(false),
	tick_period_(0.0),
	tick_prefix_(0),
	show_cursors_(false),
	cursors_(*this),
	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(int)));

	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(cursors_.first().get(), SIGNAL(time_changed()),
		this, SLOT(marker_time_changed()));
	connect(cursors_.second().get(), SIGNAL(time_changed()),
		this, SLOT(marker_time_changed()));

	connect(header_, SIGNAL(signals_moved()),
		this, SLOT(on_signals_moved()));

	connect(header_, SIGNAL(selection_changed()),
		cursorheader_, SLOT(clear_selection()));
	connect(cursorheader_, SIGNAL(selection_changed()),
		header_, SLOT(clear_selection()));

	connect(header_, SIGNAL(selection_changed()),
		this, SIGNAL(selection_changed()));
	connect(cursorheader_, 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);
	cursorheader_->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
	cursorheader_->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_;
}

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

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

int View::owner_visual_v_offset() const
{
	return -v_offset_;
}

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

CursorPair& View::cursors()
{
	return cursors_;
}

const CursorPair& View::cursors() const
{
	return cursors_;
}

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());

	const pair<int, int> extents = v_extents();
	const int extra_scroll_height = (extents.second - extents.first) / 4;
	verticalScrollBar()->setRange(extents.first - extra_scroll_height,
		extents.first + extra_scroll_height);
}

void View::update_layout()
{
	setViewportMargins(
		header_->sizeHint().width() - pv::view::Header::BaselineOffset,
		ruler_->sizeHint().height(), 0, 0);
	ruler_->setGeometry(viewport_->x(), 0,
		viewport_->width(), viewport_->y());
	cursorheader_->setGeometry(
		viewport_->x(),
		ruler_->sizeHint().height() - cursorheader_->sizeHint().height() / 2,
		viewport_->width(), cursorheader_->sizeHint().height());
	header_->setGeometry(0, viewport_->y(),
		header_->sizeHint().width(), viewport_->height());
	update_scroll();
}

void View::paint_label(QPainter &p, int right, bool hover)
{
	(void)p;
	(void)right;
	(void)hover;
}

QRectF View::label_rect(int right)
{
	(void)right;
	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_ || object == cursorheader_)
			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::appearance_changed(bool label, bool content)
{
	if (label)
		header_->update();
	if (content)
		viewport_->update();
}

void View::extents_changed(bool horz, bool vert)
{
	sticky_events_ |=
		(horz ? SelectableItemHExtentsChanged : 0) |
		(vert ? SelectableItemVExtentsChanged : 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();
	cursorheader_->update();
	viewport_->update();
}

void View::v_scroll_value_changed(int value)
{
	v_offset_ = value;
	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::marker_time_changed()
{
	cursorheader_->update();
	viewport_->update();
}

void View::on_signals_moved()
{
	update_scroll();
	signals_moved();
}

void View::process_sticky_events()
{
	if (sticky_events_ & SelectableItemHExtentsChanged)
		update_layout();
	if (sticky_events_ & SelectableItemVExtentsChanged)
		restack_all_row_items();

	// 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 "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_(*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	double View::scale() const
	199	{
	200	return scale_;
	201	}
	202
	203	double View::offset() const
	204	{
	205	return offset_;
	206	}
	207
	208	int View::owner_visual_v_offset() const
	209	{
	210	return -v_offset_;
	211	}
	212
	213	unsigned int View::depth() const
	214	{
	215	return 0;
	216	}
	217
	218	unsigned int View::tick_prefix() const
	219	{
	220	return tick_prefix_;
	221	}
	222
	223	double View::tick_period() const
	224	{
	225	return tick_period_;
	226	}
	227
	228	void View::zoom(double steps)
	229	{
	230	zoom(steps, viewport_->width() / 2);
	231	}
	232
	233	void View::zoom(double steps, int offset)
	234	{
	235	set_zoom(scale_ * pow(3.0/2.0, -steps), offset);
	236	}
	237
	238	void View::zoom_fit()
	239	{
	240	const pair<double, double> extents = get_time_extents();
	241	const double delta = extents.second - extents.first;
	242	if (delta < 1e-12)
	243	return;
	244
	245	assert(viewport_);
	246	const int w = viewport_->width();
	247	if (w <= 0)
	248	return;
	249
	250	const double scale = max(min(delta / w, MaxScale), MinScale);
	251	set_scale_offset(scale, extents.first);
	252	}
	253
	254	void View::zoom_one_to_one()
	255	{
	256	using pv::data::SignalData;
	257
	258	// Make a set of all the visible data objects
	259	set< shared_ptr<SignalData> > visible_data = get_visible_data();
	260	if (visible_data.empty())
	261	return;
	262
	263	double samplerate = 0.0;
	264	for (const shared_ptr<SignalData> d : visible_data) {
	265	assert(d);
	266	const vector< shared_ptr<Segment> > segments =
	267	d->segments();
	268	for (const shared_ptr<Segment> &s : segments)
	269	samplerate = max(samplerate, s->samplerate());
	270	}
	271
	272	if (samplerate == 0.0)
	273	return;
	274
	275	assert(viewport_);
	276	const int w = viewport_->width();
	277	if (w <= 0)
	278	return;
	279
	280	set_zoom(1.0 / samplerate, w / 2);
	281	}
	282
	283	void View::set_scale_offset(double scale, double offset)
	284	{
	285	scale_ = scale;
	286	offset_ = offset;
	287
	288	calculate_tick_spacing();
	289
	290	update_scroll();
	291	ruler_->update();
	292	cursorheader_->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	cursorheader_->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	cursorheader_->update();
	355	viewport_->update();
	356	}
	357
	358	CursorPair& View::cursors()
	359	{
	360	return cursors_;
	361	}
	362
	363	const CursorPair& View::cursors() const
	364	{
	365	return cursors_;
	366	}
	367
	368	const QPoint& View::hover_point() const
	369	{
	370	return hover_point_;
	371	}
	372
	373	void View::update_viewport()
	374	{
	375	assert(viewport_);
	376	viewport_->update();
	377	header_->update();
	378	}
	379
	380	void View::restack_all_row_items()
	381	{
	382	// Make a set of owners
	383	unordered_set< RowItemOwner* > owners;
	384	for (const auto &r : *this)
	385	owners.insert(r->owner());
	386
	387	// Make a list that is sorted from deepest first
	388	vector< RowItemOwner* > sorted_owners(owners.begin(), owners.end());
	389	sort(sorted_owners.begin(), sorted_owners.end(),
	390	[](const RowItemOwner* a, const RowItemOwner *b) {
	391	return a->depth() > b->depth(); });
	392
	393	// Restack the items recursively
	394	for (auto &o : sorted_owners)
	395	o->restack_items();
	396
	397	// Animate the items to their destination
	398	for (const auto &r : *this)
	399	r->animate_to_layout_v_offset();
	400	}
	401
	402	void View::get_scroll_layout(double &length, double &offset) const
	403	{
	404	const pair<double, double> extents = get_time_extents();
	405	length = (extents.second - extents.first) / scale_;
	406	offset = offset_ / scale_;
	407	}
	408
	409	void View::set_zoom(double scale, int offset)
	410	{
	411	const double cursor_offset = offset_ + scale_ * offset;
	412	const double new_scale = max(min(scale, MaxScale), MinScale);
	413	const double new_offset = cursor_offset - new_scale * offset;
	414	set_scale_offset(new_scale, new_offset);
	415	}
	416
	417	void View::calculate_tick_spacing()
	418	{
	419	const double SpacingIncrement = 32.0f;
	420	const double MinValueSpacing = 32.0f;
	421
	422	double min_width = SpacingIncrement, typical_width;
	423
	424	QFontMetrics m(QApplication::font());
	425
	426	do {
	427	const double min_period = scale_ * min_width;
	428
	429	const int order = (int)floorf(log10f(min_period));
	430	const double order_decimal = pow(10.0, order);
	431
	432	unsigned int unit = 0;
	433
	434	do {
	435	tick_period_ = order_decimal * ScaleUnits[unit++];
	436	} while (tick_period_ < min_period &&
	437	unit < countof(ScaleUnits));
	438
	439	tick_prefix_ = (order - pv::util::FirstSIPrefixPower) / 3;
	440
	441	typical_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
	442	Qt::AlignLeft \| Qt::AlignTop,
	443	format_time(offset_, tick_prefix_)).width() +
	444	MinValueSpacing;
	445
	446	min_width += SpacingIncrement;
	447
	448	} while(typical_width > tick_period_ / scale_);
	449	}
	450
	451	void View::update_scroll()
	452	{
	453	assert(viewport_);
	454
	455	const QSize areaSize = viewport_->size();
	456
	457	// Set the horizontal scroll bar
	458	double length = 0, offset = 0;
	459	get_scroll_layout(length, offset);
	460	length = max(length - areaSize.width(), 0.0);
	461
	462	int major_tick_distance = tick_period_ / scale_;
	463
	464	horizontalScrollBar()->setPageStep(areaSize.width() / 2);
	465	horizontalScrollBar()->setSingleStep(major_tick_distance);
	466
	467	updating_scroll_ = true;
	468
	469	if (length < MaxScrollValue) {
	470	horizontalScrollBar()->setRange(0, length);
	471	horizontalScrollBar()->setSliderPosition(offset);
	472	} else {
	473	horizontalScrollBar()->setRange(0, MaxScrollValue);
	474	horizontalScrollBar()->setSliderPosition(
	475	offset_ * MaxScrollValue / (scale_ * length));
	476	}
	477
	478	updating_scroll_ = false;
	479
	480	// Set the vertical scrollbar
	481	verticalScrollBar()->setPageStep(areaSize.height());
	482
	483	const pair<int, int> extents = v_extents();
	484	const int extra_scroll_height = (extents.second - extents.first) / 4;
	485	verticalScrollBar()->setRange(extents.first - extra_scroll_height,
	486	extents.first + extra_scroll_height);
	487	}
	488
	489	void View::update_layout()
	490	{
	491	setViewportMargins(
	492	header_->sizeHint().width() - pv::view::Header::BaselineOffset,
	493	ruler_->sizeHint().height(), 0, 0);
	494	ruler_->setGeometry(viewport_->x(), 0,
	495	viewport_->width(), viewport_->y());
	496	cursorheader_->setGeometry(
	497	viewport_->x(),
	498	ruler_->sizeHint().height() - cursorheader_->sizeHint().height() / 2,
	499	viewport_->width(), cursorheader_->sizeHint().height());
	500	header_->setGeometry(0, viewport_->y(),
	501	header_->sizeHint().width(), viewport_->height());
	502	update_scroll();
	503	}
	504
	505	void View::paint_label(QPainter &p, int right, bool hover)
	506	{
	507	(void)p;
	508	(void)right;
	509	(void)hover;
	510	}
	511
	512	QRectF View::label_rect(int right)
	513	{
	514	(void)right;
	515	return QRectF();
	516	}
	517
	518	bool View::add_channels_to_owner(
	519	const vector< shared_ptr<sigrok::Channel> > &channels,
	520	RowItemOwner *owner, int &offset,
	521	unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
	522	&signal_map,
	523	std::function<bool (shared_ptr<RowItem>)> filter_func)
	524	{
	525	bool any_added = false;
	526
	527	assert(owner);
	528
	529	for (const auto &channel : channels)
	530	{
	531	const auto iter = signal_map.find(channel);
	532	if (iter == signal_map.end() \|\|
	533	(filter_func && !filter_func((*iter).second)))
	534	continue;
	535
	536	shared_ptr<RowItem> row_item = (*iter).second;
	537	owner->add_child_item(row_item);
	538	apply_offset(row_item, offset);
	539	signal_map.erase(iter);
	540
	541	any_added = true;
	542	}
	543
	544	return any_added;
	545	}
	546
	547	void View::apply_offset(shared_ptr<RowItem> row_item, int &offset) {
	548	assert(row_item);
	549	const pair<int, int> extents = row_item->v_extents();
	550	if (row_item->enabled())
	551	offset += -extents.first;
	552	row_item->force_to_v_offset(offset);
	553	if (row_item->enabled())
	554	offset += extents.second;
	555	}
	556
	557	bool View::eventFilter(QObject object, QEvent event)
	558	{
	559	const QEvent::Type type = event->type();
	560	if (type == QEvent::MouseMove) {
	561
	562	const QMouseEvent const mouse_event = (QMouseEvent)event;
	563	if (object == viewport_)
	564	hover_point_ = mouse_event->pos();
	565	else if (object == ruler_ \|\| object == cursorheader_)
	566	hover_point_ = QPoint(mouse_event->x(), 0);
	567	else if (object == header_)
	568	hover_point_ = QPoint(0, mouse_event->y());
	569	else
	570	hover_point_ = QPoint(-1, -1);
	571
	572	hover_point_changed();
	573
	574	} else if (type == QEvent::Leave) {
	575	hover_point_ = QPoint(-1, -1);
	576	hover_point_changed();
	577	}
	578
	579	return QObject::eventFilter(object, event);
	580	}
	581
	582	bool View::viewportEvent(QEvent *e)
	583	{
	584	switch(e->type()) {
	585	case QEvent::Paint:
	586	case QEvent::MouseButtonPress:
	587	case QEvent::MouseButtonRelease:
	588	case QEvent::MouseButtonDblClick:
	589	case QEvent::MouseMove:
	590	case QEvent::Wheel:
	591	case QEvent::TouchBegin:
	592	case QEvent::TouchUpdate:
	593	case QEvent::TouchEnd:
	594	return false;
	595
	596	default:
	597	return QAbstractScrollArea::viewportEvent(e);
	598	}
	599	}
	600
	601	void View::resizeEvent(QResizeEvent*)
	602	{
	603	update_layout();
	604	}
	605
	606	void View::appearance_changed(bool label, bool content)
	607	{
	608	if (label)
	609	header_->update();
	610	if (content)
	611	viewport_->update();
	612	}
	613
	614	void View::extents_changed(bool horz, bool vert)
	615	{
	616	sticky_events_ \|=
	617	(horz ? SelectableItemHExtentsChanged : 0) \|
	618	(vert ? SelectableItemVExtentsChanged : 0);
	619	lazy_event_handler_.start();
	620	}
	621
	622	void View::h_scroll_value_changed(int value)
	623	{
	624	if (updating_scroll_)
	625	return;
	626
	627	const int range = horizontalScrollBar()->maximum();
	628	if (range < MaxScrollValue)
	629	offset_ = scale_ * value;
	630	else {
	631	double length = 0, offset;
	632	get_scroll_layout(length, offset);
	633	offset_ = scale_ * length * value / MaxScrollValue;
	634	}
	635
	636	ruler_->update();
	637	cursorheader_->update();
	638	viewport_->update();
	639	}
	640
	641	void View::v_scroll_value_changed(int value)
	642	{
	643	v_offset_ = value;
	644	header_->update();
	645	viewport_->update();
	646	}
	647
	648	void View::signals_changed()
	649	{
	650	int offset = 0;
	651
	652	// Populate the traces
	653	clear_child_items();
	654
	655	shared_ptr<sigrok::Device> device = session_.device();
	656	assert(device);
	657
	658	// Collect a set of signals
	659	unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
	660	signal_map;
	661
	662	shared_lock<shared_mutex> lock(session_.signals_mutex());
	663	const vector< shared_ptr<Signal> > &sigs(session_.signals());
	664
	665	for (const shared_ptr<Signal> &sig : sigs)
	666	signal_map[sig->channel()] = sig;
	667
	668	// Populate channel groups
	669	for (auto entry : device->channel_groups())
	670	{
	671	const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
	672
	673	if (group->channels().size() <= 1)
	674	continue;
	675
	676	shared_ptr<TraceGroup> trace_group(new TraceGroup());
	677	int child_offset = 0;
	678	if (add_channels_to_owner(group->channels(),
	679	trace_group.get(), child_offset, signal_map))
	680	{
	681	add_child_item(trace_group);
	682	apply_offset(trace_group, offset);
	683	}
	684	}
	685
	686	// Add the remaining logic channels
	687	shared_ptr<TraceGroup> logic_trace_group(new TraceGroup());
	688	int child_offset = 0;
	689
	690	if (add_channels_to_owner(device->channels(),
	691	logic_trace_group.get(), child_offset, signal_map,
	692	[](shared_ptr<RowItem> r) -> bool {
	693	return dynamic_pointer_cast<LogicSignal>(r) != nullptr;
	694	}))
	695
	696	{
	697	add_child_item(logic_trace_group);
	698	apply_offset(logic_trace_group, offset);
	699	}
	700
	701	// Add the remaining channels
	702	add_channels_to_owner(device->channels(), this, offset, signal_map);
	703	assert(signal_map.empty());
	704
	705	// Add decode signals
	706	#ifdef ENABLE_DECODE
	707	const vector< shared_ptr<DecodeTrace> > decode_sigs(
	708	session().get_decode_signals());
	709	for (auto s : decode_sigs) {
	710	add_child_item(s);
	711	apply_offset(s, offset);
	712	}
	713	#endif
	714
	715	update_layout();
	716	}
	717
	718	void View::data_updated()
	719	{
	720	// Update the scroll bars
	721	update_scroll();
	722
	723	// Repaint the view
	724	viewport_->update();
	725	}
	726
	727	void View::marker_time_changed()
	728	{
	729	cursorheader_->update();
	730	viewport_->update();
	731	}
	732
	733	void View::on_signals_moved()
	734	{
	735	update_scroll();
	736	signals_moved();
	737	}
	738
	739	void View::process_sticky_events()
	740	{
	741	if (sticky_events_ & SelectableItemHExtentsChanged)
	742	update_layout();
	743	if (sticky_events_ & SelectableItemVExtentsChanged)
	744	restack_all_row_items();
	745
	746	// Clear the sticky events
	747	sticky_events_ = 0;
	748	}
	749
	750	void View::on_hover_point_changed()
	751	{
	752	for (shared_ptr<RowItem> r : *this)
	753	r->hover_point_changed();
	754	}
	755
	756	} // namespace view
	757	} // namespace pv