[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 <cassert>
#include <climits>
#include <cmath>
#include <mutex>
#include <unordered_set>

#include <QEvent>
#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/sigsession.hpp"
#include "pv/data/logic.hpp"
#include "pv/data/logicsnapshot.hpp"

using boost::shared_lock;
using boost::shared_mutex;
using pv::data::SignalData;
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 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),
	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();
}

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;
}

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);
		samplerate = max(samplerate, d->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;

	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
{
	const set< shared_ptr<SignalData> > visible_data = get_visible_data();
	if (visible_data.empty())
		return make_pair(0.0, 0.0);

	double left_time = DBL_MAX, right_time = DBL_MIN;
	for (const shared_ptr<SignalData> d : visible_data)
	{
		const double start_time = d->get_start_time();
		double samplerate = d->samplerate();
		samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;

		left_time = min(left_time, start_time);
		right_time = max(right_time, start_time +
			d->get_max_sample_count() / samplerate);
	}

	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::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);

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

	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 <cassert>
	26	#include <climits>
	27	#include <cmath>
	28	#include <mutex>
	29	#include <unordered_set>
	30
	31	#include <QEvent>
	32	#include <QMouseEvent>
	33	#include <QScrollBar>
	34
	35	#include <libsigrok/libsigrok.hpp>
	36
	37	#include "cursorheader.hpp"
	38	#include "decodetrace.hpp"
	39	#include "header.hpp"
	40	#include "logicsignal.hpp"
	41	#include "ruler.hpp"
	42	#include "signal.hpp"
	43	#include "tracegroup.hpp"
	44	#include "view.hpp"
	45	#include "viewport.hpp"
	46
	47	#include "pv/sigsession.hpp"
	48	#include "pv/data/logic.hpp"
	49	#include "pv/data/logicsnapshot.hpp"
	50
	51	using boost::shared_lock;
	52	using boost::shared_mutex;
	53	using pv::data::SignalData;
	54	using std::back_inserter;
	55	using std::deque;
	56	using std::dynamic_pointer_cast;
	57	using std::list;
	58	using std::lock_guard;
	59	using std::max;
	60	using std::make_pair;
	61	using std::min;
	62	using std::pair;
	63	using std::set;
	64	using std::shared_ptr;
	65	using std::unordered_map;
	66	using std::unordered_set;
	67	using std::vector;
	68	using std::weak_ptr;
	69
	70	namespace pv {
	71	namespace view {
	72
	73	const double View::MaxScale = 1e9;
	74	const double View::MinScale = 1e-15;
	75
	76	const int View::MaxScrollValue = INT_MAX / 2;
	77
	78	const QColor View::CursorAreaColour(220, 231, 243);
	79
	80	const QSizeF View::LabelPadding(4, 0);
	81
	82	View::View(Session &session, QWidget *parent) :
	83	QAbstractScrollArea(parent),
	84	session_(session),
	85	viewport_(new Viewport(*this)),
	86	ruler_(new Ruler(*this)),
	87	cursorheader_(new CursorHeader(*this)),
	88	header_(new Header(*this)),
	89	scale_(1e-6),
	90	offset_(0),
	91	v_offset_(0),
	92	updating_scroll_(false),
	93	show_cursors_(false),
	94	cursors_(*this),
	95	hover_point_(-1, -1)
	96	{
	97	connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
	98	this, SLOT(h_scroll_value_changed(int)));
	99	connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
	100	this, SLOT(v_scroll_value_changed(int)));
	101
	102	connect(&session_, SIGNAL(signals_changed()),
	103	this, SLOT(signals_changed()));
	104	connect(&session_, SIGNAL(capture_state_changed(int)),
	105	this, SLOT(data_updated()));
	106	connect(&session_, SIGNAL(data_received()),
	107	this, SLOT(data_updated()));
	108	connect(&session_, SIGNAL(frame_ended()),
	109	this, SLOT(data_updated()));
	110
	111	connect(cursors_.first().get(), SIGNAL(time_changed()),
	112	this, SLOT(marker_time_changed()));
	113	connect(cursors_.second().get(), SIGNAL(time_changed()),
	114	this, SLOT(marker_time_changed()));
	115
	116	connect(header_, SIGNAL(signals_moved()),
	117	this, SLOT(on_signals_moved()));
	118
	119	connect(header_, SIGNAL(selection_changed()),
	120	cursorheader_, SLOT(clear_selection()));
	121	connect(cursorheader_, SIGNAL(selection_changed()),
	122	header_, SLOT(clear_selection()));
	123
	124	connect(header_, SIGNAL(selection_changed()),
	125	this, SIGNAL(selection_changed()));
	126	connect(cursorheader_, SIGNAL(selection_changed()),
	127	this, SIGNAL(selection_changed()));
	128
	129	connect(this, SIGNAL(hover_point_changed()),
	130	this, SLOT(on_hover_point_changed()));
	131
	132	connect(&lazy_event_handler_, SIGNAL(timeout()),
	133	this, SLOT(process_sticky_events()));
	134	lazy_event_handler_.setSingleShot(true);
	135
	136	setViewport(viewport_);
	137
	138	viewport_->installEventFilter(this);
	139	ruler_->installEventFilter(this);
	140	cursorheader_->installEventFilter(this);
	141	header_->installEventFilter(this);
	142
	143	// Trigger the initial event manually. The default device has signals
	144	// which were created before this object came into being
	145	signals_changed();
	146
	147	// make sure the transparent widgets are on the top
	148	cursorheader_->raise();
	149	header_->raise();
	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	double View::scale() const
	183	{
	184	return scale_;
	185	}
	186
	187	double View::offset() const
	188	{
	189	return offset_;
	190	}
	191
	192	int View::owner_visual_v_offset() const
	193	{
	194	return -v_offset_;
	195	}
	196
	197	unsigned int View::depth() const
	198	{
	199	return 0;
	200	}
	201
	202	void View::zoom(double steps)
	203	{
	204	zoom(steps, viewport_->width() / 2);
	205	}
	206
	207	void View::zoom(double steps, int offset)
	208	{
	209	set_zoom(scale_ * pow(3.0/2.0, -steps), offset);
	210	}
	211
	212	void View::zoom_fit()
	213	{
	214	const pair<double, double> extents = get_time_extents();
	215	const double delta = extents.second - extents.first;
	216	if (delta < 1e-12)
	217	return;
	218
	219	assert(viewport_);
	220	const int w = viewport_->width();
	221	if (w <= 0)
	222	return;
	223
	224	const double scale = max(min(delta / w, MaxScale), MinScale);
	225	set_scale_offset(scale, extents.first);
	226	}
	227
	228	void View::zoom_one_to_one()
	229	{
	230	using pv::data::SignalData;
	231
	232	// Make a set of all the visible data objects
	233	set< shared_ptr<SignalData> > visible_data = get_visible_data();
	234	if (visible_data.empty())
	235	return;
	236
	237	double samplerate = 0.0;
	238	for (const shared_ptr<SignalData> d : visible_data) {
	239	assert(d);
	240	samplerate = max(samplerate, d->samplerate());
	241	}
	242
	243	if (samplerate == 0.0)
	244	return;
	245
	246	assert(viewport_);
	247	const int w = viewport_->width();
	248	if (w <= 0)
	249	return;
	250
	251	set_zoom(1.0 / samplerate, w / 2);
	252	}
	253
	254	void View::set_scale_offset(double scale, double offset)
	255	{
	256	scale_ = scale;
	257	offset_ = offset;
	258
	259	update_scroll();
	260	ruler_->update();
	261	cursorheader_->update();
	262	viewport_->update();
	263	scale_offset_changed();
	264	}
	265
	266	set< shared_ptr<SignalData> > View::get_visible_data() const
	267	{
	268	shared_lock<shared_mutex> lock(session().signals_mutex());
	269	const vector< shared_ptr<Signal> > &sigs(session().signals());
	270
	271	// Make a set of all the visible data objects
	272	set< shared_ptr<SignalData> > visible_data;
	273	for (const shared_ptr<Signal> sig : sigs)
	274	if (sig->enabled())
	275	visible_data.insert(sig->data());
	276
	277	return visible_data;
	278	}
	279
	280	pair<double, double> View::get_time_extents() const
	281	{
	282	const set< shared_ptr<SignalData> > visible_data = get_visible_data();
	283	if (visible_data.empty())
	284	return make_pair(0.0, 0.0);
	285
	286	double left_time = DBL_MAX, right_time = DBL_MIN;
	287	for (const shared_ptr<SignalData> d : visible_data)
	288	{
	289	const double start_time = d->get_start_time();
	290	double samplerate = d->samplerate();
	291	samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
	292
	293	left_time = min(left_time, start_time);
	294	right_time = max(right_time, start_time +
	295	d->get_max_sample_count() / samplerate);
	296	}
	297
	298	assert(left_time < right_time);
	299	return make_pair(left_time, right_time);
	300	}
	301
	302	bool View::cursors_shown() const
	303	{
	304	return show_cursors_;
	305	}
	306
	307	void View::show_cursors(bool show)
	308	{
	309	show_cursors_ = show;
	310	cursorheader_->update();
	311	viewport_->update();
	312	}
	313
	314	void View::centre_cursors()
	315	{
	316	const double time_width = scale_ * viewport_->width();
	317	cursors_.first()->set_time(offset_ + time_width * 0.4);
	318	cursors_.second()->set_time(offset_ + time_width * 0.6);
	319	cursorheader_->update();
	320	viewport_->update();
	321	}
	322
	323	CursorPair& View::cursors()
	324	{
	325	return cursors_;
	326	}
	327
	328	const CursorPair& View::cursors() const
	329	{
	330	return cursors_;
	331	}
	332
	333	const QPoint& View::hover_point() const
	334	{
	335	return hover_point_;
	336	}
	337
	338	void View::update_viewport()
	339	{
	340	assert(viewport_);
	341	viewport_->update();
	342	header_->update();
	343	}
	344
	345	void View::restack_all_row_items()
	346	{
	347	// Make a set of owners
	348	unordered_set< RowItemOwner* > owners;
	349	for (const auto &r : *this)
	350	owners.insert(r->owner());
	351
	352	// Make a list that is sorted from deepest first
	353	vector< RowItemOwner* > sorted_owners(owners.begin(), owners.end());
	354	sort(sorted_owners.begin(), sorted_owners.end(),
	355	[](const RowItemOwner* a, const RowItemOwner *b) {
	356	return a->depth() > b->depth(); });
	357
	358	// Restack the items recursively
	359	for (auto &o : sorted_owners)
	360	o->restack_items();
	361
	362	// Animate the items to their destination
	363	for (const auto &r : *this)
	364	r->animate_to_layout_v_offset();
	365	}
	366
	367	void View::get_scroll_layout(double &length, double &offset) const
	368	{
	369	const pair<double, double> extents = get_time_extents();
	370	length = (extents.second - extents.first) / scale_;
	371	offset = offset_ / scale_;
	372	}
	373
	374	void View::set_zoom(double scale, int offset)
	375	{
	376	const double cursor_offset = offset_ + scale_ * offset;
	377	const double new_scale = max(min(scale, MaxScale), MinScale);
	378	const double new_offset = cursor_offset - new_scale * offset;
	379	set_scale_offset(new_scale, new_offset);
	380	}
	381
	382	void View::update_scroll()
	383	{
	384	assert(viewport_);
	385
	386	const QSize areaSize = viewport_->size();
	387
	388	// Set the horizontal scroll bar
	389	double length = 0, offset = 0;
	390	get_scroll_layout(length, offset);
	391	length = max(length - areaSize.width(), 0.0);
	392
	393	horizontalScrollBar()->setPageStep(areaSize.width() / 2);
	394
	395	updating_scroll_ = true;
	396
	397	if (length < MaxScrollValue) {
	398	horizontalScrollBar()->setRange(0, length);
	399	horizontalScrollBar()->setSliderPosition(offset);
	400	} else {
	401	horizontalScrollBar()->setRange(0, MaxScrollValue);
	402	horizontalScrollBar()->setSliderPosition(
	403	offset_ * MaxScrollValue / (scale_ * length));
	404	}
	405
	406	updating_scroll_ = false;
	407
	408	// Set the vertical scrollbar
	409	verticalScrollBar()->setPageStep(areaSize.height());
	410
	411	const pair<int, int> extents = v_extents();
	412	const int extra_scroll_height = (extents.second - extents.first) / 4;
	413	verticalScrollBar()->setRange(extents.first - extra_scroll_height,
	414	extents.first + extra_scroll_height);
	415	}
	416
	417	void View::update_layout()
	418	{
	419	setViewportMargins(
	420	header_->sizeHint().width() - pv::view::Header::BaselineOffset,
	421	ruler_->sizeHint().height(), 0, 0);
	422	ruler_->setGeometry(viewport_->x(), 0,
	423	viewport_->width(), viewport_->y());
	424	cursorheader_->setGeometry(
	425	viewport_->x(),
	426	ruler_->sizeHint().height() - cursorheader_->sizeHint().height() / 2,
	427	viewport_->width(), cursorheader_->sizeHint().height());
	428	header_->setGeometry(0, viewport_->y(),
	429	header_->sizeHint().width(), viewport_->height());
	430	update_scroll();
	431	}
	432
	433	void View::paint_label(QPainter &p, int right, bool hover)
	434	{
	435	(void)p;
	436	(void)right;
	437	(void)hover;
	438	}
	439
	440	QRectF View::label_rect(int right)
	441	{
	442	(void)right;
	443	return QRectF();
	444	}
	445
	446	bool View::add_channels_to_owner(
	447	const vector< shared_ptr<sigrok::Channel> > &channels,
	448	RowItemOwner *owner, int &offset,
	449	unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
	450	&signal_map,
	451	std::function<bool (shared_ptr<RowItem>)> filter_func)
	452	{
	453	bool any_added = false;
	454
	455	assert(owner);
	456
	457	for (const auto &channel : channels)
	458	{
	459	const auto iter = signal_map.find(channel);
	460	if (iter == signal_map.end() \|\|
	461	(filter_func && !filter_func((*iter).second)))
	462	continue;
	463
	464	shared_ptr<RowItem> row_item = (*iter).second;
	465	owner->add_child_item(row_item);
	466	apply_offset(row_item, offset);
	467	signal_map.erase(iter);
	468
	469	any_added = true;
	470	}
	471
	472	return any_added;
	473	}
	474
	475	void View::apply_offset(shared_ptr<RowItem> row_item, int &offset) {
	476	assert(row_item);
	477	const pair<int, int> extents = row_item->v_extents();
	478	if (row_item->enabled())
	479	offset += -extents.first;
	480	row_item->force_to_v_offset(offset);
	481	if (row_item->enabled())
	482	offset += extents.second;
	483	}
	484
	485	bool View::eventFilter(QObject object, QEvent event)
	486	{
	487	const QEvent::Type type = event->type();
	488	if (type == QEvent::MouseMove) {
	489
	490	const QMouseEvent const mouse_event = (QMouseEvent)event;
	491	if (object == viewport_)
	492	hover_point_ = mouse_event->pos();
	493	else if (object == ruler_ \|\| object == cursorheader_)
	494	hover_point_ = QPoint(mouse_event->x(), 0);
	495	else if (object == header_)
	496	hover_point_ = QPoint(0, mouse_event->y());
	497	else
	498	hover_point_ = QPoint(-1, -1);
	499
	500	hover_point_changed();
	501
	502	} else if (type == QEvent::Leave) {
	503	hover_point_ = QPoint(-1, -1);
	504	hover_point_changed();
	505	}
	506
	507	return QObject::eventFilter(object, event);
	508	}
	509
	510	bool View::viewportEvent(QEvent *e)
	511	{
	512	switch(e->type()) {
	513	case QEvent::Paint:
	514	case QEvent::MouseButtonPress:
	515	case QEvent::MouseButtonRelease:
	516	case QEvent::MouseButtonDblClick:
	517	case QEvent::MouseMove:
	518	case QEvent::Wheel:
	519	case QEvent::TouchBegin:
	520	case QEvent::TouchUpdate:
	521	case QEvent::TouchEnd:
	522	return false;
	523
	524	default:
	525	return QAbstractScrollArea::viewportEvent(e);
	526	}
	527	}
	528
	529	void View::resizeEvent(QResizeEvent*)
	530	{
	531	update_layout();
	532	}
	533
	534	void View::appearance_changed(bool label, bool content)
	535	{
	536	if (label)
	537	header_->update();
	538	if (content)
	539	viewport_->update();
	540	}
	541
	542	void View::extents_changed(bool horz, bool vert)
	543	{
	544	sticky_events_ \|=
	545	(horz ? SelectableItemHExtentsChanged : 0) \|
	546	(vert ? SelectableItemVExtentsChanged : 0);
	547	lazy_event_handler_.start();
	548	}
	549
	550	void View::h_scroll_value_changed(int value)
	551	{
	552	if (updating_scroll_)
	553	return;
	554
	555	const int range = horizontalScrollBar()->maximum();
	556	if (range < MaxScrollValue)
	557	offset_ = scale_ * value;
	558	else {
	559	double length = 0, offset;
	560	get_scroll_layout(length, offset);
	561	offset_ = scale_ * length * value / MaxScrollValue;
	562	}
	563
	564	ruler_->update();
	565	cursorheader_->update();
	566	viewport_->update();
	567	}
	568
	569	void View::v_scroll_value_changed(int value)
	570	{
	571	v_offset_ = value;
	572	header_->update();
	573	viewport_->update();
	574	}
	575
	576	void View::signals_changed()
	577	{
	578	int offset = 0;
	579
	580	// Populate the traces
	581	clear_child_items();
	582
	583	shared_ptr<sigrok::Device> device = session_.device();
	584	assert(device);
	585
	586	// Collect a set of signals
	587	unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
	588	signal_map;
	589
	590	shared_lock<shared_mutex> lock(session_.signals_mutex());
	591	const vector< shared_ptr<Signal> > &sigs(session_.signals());
	592
	593	for (const shared_ptr<Signal> &sig : sigs)
	594	signal_map[sig->channel()] = sig;
	595
	596	// Populate channel groups
	597	for (auto entry : device->channel_groups())
	598	{
	599	const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
	600
	601	if (group->channels().size() <= 1)
	602	continue;
	603
	604	shared_ptr<TraceGroup> trace_group(new TraceGroup());
	605	int child_offset = 0;
	606	if (add_channels_to_owner(group->channels(),
	607	trace_group.get(), child_offset, signal_map))
	608	{
	609	add_child_item(trace_group);
	610	apply_offset(trace_group, offset);
	611	}
	612	}
	613
	614	// Add the remaining logic channels
	615	shared_ptr<TraceGroup> logic_trace_group(new TraceGroup());
	616	int child_offset = 0;
	617
	618	if (add_channels_to_owner(device->channels(),
	619	logic_trace_group.get(), child_offset, signal_map,
	620	[](shared_ptr<RowItem> r) -> bool {
	621	return dynamic_pointer_cast<LogicSignal>(r) != nullptr;
	622	}))
	623
	624	{
	625	add_child_item(logic_trace_group);
	626	apply_offset(logic_trace_group, offset);
	627	}
	628
	629	// Add the remaining channels
	630	add_channels_to_owner(device->channels(), this, offset, signal_map);
	631	assert(signal_map.empty());
	632
	633	// Add decode signals
	634	#ifdef ENABLE_DECODE
	635	const vector< shared_ptr<DecodeTrace> > decode_sigs(
	636	session().get_decode_signals());
	637	for (auto s : decode_sigs) {
	638	add_child_item(s);
	639	apply_offset(s, offset);
	640	}
	641	#endif
	642
	643	update_layout();
	644	}
	645
	646	void View::data_updated()
	647	{
	648	// Update the scroll bars
	649	update_scroll();
	650
	651	// Repaint the view
	652	viewport_->update();
	653	}
	654
	655	void View::marker_time_changed()
	656	{
	657	cursorheader_->update();
	658	viewport_->update();
	659	}
	660
	661	void View::on_signals_moved()
	662	{
	663	update_scroll();
	664	signals_moved();
	665	}
	666
	667	void View::process_sticky_events()
	668	{
	669	if (sticky_events_ & SelectableItemHExtentsChanged)
	670	update_layout();
	671	if (sticky_events_ & SelectableItemVExtentsChanged)
	672	restack_all_row_items();
	673
	674	// Clear the sticky events
	675	sticky_events_ = 0;
	676	}
	677
	678	void View::on_hover_point_changed()
	679	{
	680	for (shared_ptr<RowItem> r : *this)
	681	r->hover_point_changed();
	682	}
	683
	684	} // namespace view
	685	} // namespace pv