[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 <assert.h>
#include <limits.h>
#include <math.h>

#include <QEvent>
#include <QMouseEvent>
#include <QScrollBar>

#include "cursorheader.h"
#include "decodetrace.h"
#include "header.h"
#include "ruler.h"
#include "signal.h"
#include "view.h"
#include "viewport.h"

#include "pv/sigsession.h"
#include "pv/data/logic.h"
#include "pv/data/logicsnapshot.h"

using pv::data::SignalData;
using std::back_inserter;
using std::deque;
using std::list;
using std::max;
using std::make_pair;
using std::min;
using std::pair;
using std::set;
using std::shared_ptr;
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::SignalHeight = 30;
const int View::SignalMargin = 10;
const int View::SignalSnapGridSize = 10;

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

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

View::View(SigSession &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(geometry_updated()),
		this, SLOT(on_geometry_updated()));
	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()));

	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();
}

SigSession& View::session()
{
	return _session;
}

const SigSession& 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_v_offset() const
{
	return -_v_offset;
}

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;

	const vector< shared_ptr<Signal> > sigs(
		session().get_signals());

	// 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();
}

vector< shared_ptr<RowItem> > View::child_items() const
{
	vector< shared_ptr<RowItem> > row_items;

	const vector< shared_ptr<Signal> > sigs(
		session().get_signals());
	copy(sigs.begin(), sigs.end(), back_inserter(row_items));

#ifdef ENABLE_DECODE
	const vector< shared_ptr<DecodeTrace> > decode_sigs(
		session().get_decode_signals());
	copy(decode_sigs.begin(), decode_sigs.end(), back_inserter(row_items));
#endif

	stable_sort(row_items.begin(), row_items.end(),
		[](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
			return a->v_offset() < b->v_offset(); });

	return row_items;
}

list<weak_ptr<SelectableItem> > View::selected_items() const
{
	list<weak_ptr<SelectableItem> > items;

	// List the selected signals
	const vector< shared_ptr<RowItem> > row_items(child_items());
	for (shared_ptr<RowItem> r : row_items) {
		assert(r);
		if (r->selected())
			items.push_back(r);
	}

	// List the selected cursors
	if (_cursors.first()->selected())
		items.push_back(_cursors.first());
	if (_cursors.second()->selected())
		items.push_back(_cursors.second());

	return items;
}

set< shared_ptr<SignalData> > View::get_visible_data() const
{
	const vector< shared_ptr<Signal> > sigs(
		session().get_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::normalize_layout()
{
	const vector< shared_ptr<RowItem> > row_items(child_items());

	int v_min = INT_MAX;
	for (const shared_ptr<RowItem> r : row_items)
		v_min = min(r->v_offset(), v_min);

	const int delta = -min(v_min, 0);
	for (shared_ptr<RowItem> r : row_items)
		r->set_v_offset(r->v_offset() + delta);

	verticalScrollBar()->setSliderPosition(_v_offset + delta);
	v_scroll_value_changed(verticalScrollBar()->sliderPosition());
}

void View::update_viewport()
{
	assert(_viewport);
	_viewport->update();
}

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());
	verticalScrollBar()->setRange(0,
		_viewport->get_total_height() + SignalMargin -
		areaSize.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::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::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 = SignalMargin + SignalHeight;
	const vector< shared_ptr<RowItem> > row_items(child_items());
	for (shared_ptr<RowItem> r : row_items) {
		r->set_owner(this);
		r->set_v_offset(offset);
		offset += SignalHeight + 2 * SignalMargin;
	}

	update_layout();
	normalize_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::on_geometry_updated()
{
	update_layout();
}

void View::on_hover_point_changed()
{
	const vector< shared_ptr<RowItem> > row_items(child_items());
	for (shared_ptr<RowItem> r : row_items)
		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 <assert.h>
	26	#include <limits.h>
	27	#include <math.h>
	28
	29	#include <QEvent>
	30	#include <QMouseEvent>
	31	#include <QScrollBar>
	32
	33	#include "cursorheader.h"
	34	#include "decodetrace.h"
	35	#include "header.h"
	36	#include "ruler.h"
	37	#include "signal.h"
	38	#include "view.h"
	39	#include "viewport.h"
	40
	41	#include "pv/sigsession.h"
	42	#include "pv/data/logic.h"
	43	#include "pv/data/logicsnapshot.h"
	44
	45	using pv::data::SignalData;
	46	using std::back_inserter;
	47	using std::deque;
	48	using std::list;
	49	using std::max;
	50	using std::make_pair;
	51	using std::min;
	52	using std::pair;
	53	using std::set;
	54	using std::shared_ptr;
	55	using std::vector;
	56	using std::weak_ptr;
	57
	58	namespace pv {
	59	namespace view {
	60
	61	const double View::MaxScale = 1e9;
	62	const double View::MinScale = 1e-15;
	63
	64	const int View::MaxScrollValue = INT_MAX / 2;
	65
	66	const int View::SignalHeight = 30;
	67	const int View::SignalMargin = 10;
	68	const int View::SignalSnapGridSize = 10;
	69
	70	const QColor View::CursorAreaColour(220, 231, 243);
	71
	72	const QSizeF View::LabelPadding(4, 0);
	73
	74	View::View(SigSession &session, QWidget *parent) :
	75	QAbstractScrollArea(parent),
	76	_session(session),
	77	_viewport(new Viewport(*this)),
	78	_ruler(new Ruler(*this)),
	79	_cursorheader(new CursorHeader(*this)),
	80	_header(new Header(*this)),
	81	_scale(1e-6),
	82	_offset(0),
	83	_v_offset(0),
	84	_updating_scroll(false),
	85	_show_cursors(false),
	86	_cursors(*this),
	87	_hover_point(-1, -1)
	88	{
	89	connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
	90	this, SLOT(h_scroll_value_changed(int)));
	91	connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
	92	this, SLOT(v_scroll_value_changed(int)));
	93
	94	connect(&_session, SIGNAL(signals_changed()),
	95	this, SLOT(signals_changed()));
	96	connect(&_session, SIGNAL(capture_state_changed(int)),
	97	this, SLOT(data_updated()));
	98	connect(&_session, SIGNAL(data_received()),
	99	this, SLOT(data_updated()));
	100	connect(&_session, SIGNAL(frame_ended()),
	101	this, SLOT(data_updated()));
	102
	103	connect(_cursors.first().get(), SIGNAL(time_changed()),
	104	this, SLOT(marker_time_changed()));
	105	connect(_cursors.second().get(), SIGNAL(time_changed()),
	106	this, SLOT(marker_time_changed()));
	107
	108	connect(_header, SIGNAL(geometry_updated()),
	109	this, SLOT(on_geometry_updated()));
	110	connect(_header, SIGNAL(signals_moved()),
	111	this, SLOT(on_signals_moved()));
	112
	113	connect(_header, SIGNAL(selection_changed()),
	114	_cursorheader, SLOT(clear_selection()));
	115	connect(_cursorheader, SIGNAL(selection_changed()),
	116	_header, SLOT(clear_selection()));
	117
	118	connect(_header, SIGNAL(selection_changed()),
	119	this, SIGNAL(selection_changed()));
	120	connect(_cursorheader, SIGNAL(selection_changed()),
	121	this, SIGNAL(selection_changed()));
	122
	123	connect(this, SIGNAL(hover_point_changed()),
	124	this, SLOT(on_hover_point_changed()));
	125
	126	setViewport(_viewport);
	127
	128	_viewport->installEventFilter(this);
	129	_ruler->installEventFilter(this);
	130	_cursorheader->installEventFilter(this);
	131	_header->installEventFilter(this);
	132
	133	// Trigger the initial event manually. The default device has signals
	134	// which were created before this object came into being
	135	signals_changed();
	136
	137	// make sure the transparent widgets are on the top
	138	_cursorheader->raise();
	139	_header->raise();
	140	}
	141
	142	SigSession& View::session()
	143	{
	144	return _session;
	145	}
	146
	147	const SigSession& View::session() const
	148	{
	149	return _session;
	150	}
	151
	152	View* View::view()
	153	{
	154	return this;
	155	}
	156
	157	const View* View::view() const
	158	{
	159	return this;
	160	}
	161
	162	Viewport* View::viewport()
	163	{
	164	return _viewport;
	165	}
	166
	167	const Viewport* View::viewport() const
	168	{
	169	return _viewport;
	170	}
	171
	172	double View::scale() const
	173	{
	174	return _scale;
	175	}
	176
	177	double View::offset() const
	178	{
	179	return _offset;
	180	}
	181
	182	int View::owner_v_offset() const
	183	{
	184	return -_v_offset;
	185	}
	186
	187	void View::zoom(double steps)
	188	{
	189	zoom(steps, _viewport->width() / 2);
	190	}
	191
	192	void View::zoom(double steps, int offset)
	193	{
	194	set_zoom(_scale * pow(3.0/2.0, -steps), offset);
	195	}
	196
	197	void View::zoom_fit()
	198	{
	199	const pair<double, double> extents = get_time_extents();
	200	const double delta = extents.second - extents.first;
	201	if (delta < 1e-12)
	202	return;
	203
	204	assert(_viewport);
	205	const int w = _viewport->width();
	206	if (w <= 0)
	207	return;
	208
	209	const double scale = max(min(delta / w, MaxScale), MinScale);
	210	set_scale_offset(scale, extents.first);
	211	}
	212
	213	void View::zoom_one_to_one()
	214	{
	215	using pv::data::SignalData;
	216
	217	const vector< shared_ptr<Signal> > sigs(
	218	session().get_signals());
	219
	220	// Make a set of all the visible data objects
	221	set< shared_ptr<SignalData> > visible_data = get_visible_data();
	222	if (visible_data.empty())
	223	return;
	224
	225	double samplerate = 0.0;
	226	for (const shared_ptr<SignalData> d : visible_data) {
	227	assert(d);
	228	samplerate = max(samplerate, d->samplerate());
	229	}
	230
	231	if (samplerate == 0.0)
	232	return;
	233
	234	assert(_viewport);
	235	const int w = _viewport->width();
	236	if (w <= 0)
	237	return;
	238
	239	set_zoom(1.0 / samplerate, w / 2);
	240	}
	241
	242	void View::set_scale_offset(double scale, double offset)
	243	{
	244	_scale = scale;
	245	_offset = offset;
	246
	247	update_scroll();
	248	_ruler->update();
	249	_cursorheader->update();
	250	_viewport->update();
	251	scale_offset_changed();
	252	}
	253
	254	vector< shared_ptr<RowItem> > View::child_items() const
	255	{
	256	vector< shared_ptr<RowItem> > row_items;
	257
	258	const vector< shared_ptr<Signal> > sigs(
	259	session().get_signals());
	260	copy(sigs.begin(), sigs.end(), back_inserter(row_items));
	261
	262	#ifdef ENABLE_DECODE
	263	const vector< shared_ptr<DecodeTrace> > decode_sigs(
	264	session().get_decode_signals());
	265	copy(decode_sigs.begin(), decode_sigs.end(), back_inserter(row_items));
	266	#endif
	267
	268	stable_sort(row_items.begin(), row_items.end(),
	269	[](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
	270	return a->v_offset() < b->v_offset(); });
	271
	272	return row_items;
	273	}
	274
	275	list<weak_ptr<SelectableItem> > View::selected_items() const
	276	{
	277	list<weak_ptr<SelectableItem> > items;
	278
	279	// List the selected signals
	280	const vector< shared_ptr<RowItem> > row_items(child_items());
	281	for (shared_ptr<RowItem> r : row_items) {
	282	assert(r);
	283	if (r->selected())
	284	items.push_back(r);
	285	}
	286
	287	// List the selected cursors
	288	if (_cursors.first()->selected())
	289	items.push_back(_cursors.first());
	290	if (_cursors.second()->selected())
	291	items.push_back(_cursors.second());
	292
	293	return items;
	294	}
	295
	296	set< shared_ptr<SignalData> > View::get_visible_data() const
	297	{
	298	const vector< shared_ptr<Signal> > sigs(
	299	session().get_signals());
	300
	301	// Make a set of all the visible data objects
	302	set< shared_ptr<SignalData> > visible_data;
	303	for (const shared_ptr<Signal> sig : sigs)
	304	if (sig->enabled())
	305	visible_data.insert(sig->data());
	306
	307	return visible_data;
	308	}
	309
	310	pair<double, double> View::get_time_extents() const
	311	{
	312	const set< shared_ptr<SignalData> > visible_data = get_visible_data();
	313	if (visible_data.empty())
	314	return make_pair(0.0, 0.0);
	315
	316	double left_time = DBL_MAX, right_time = DBL_MIN;
	317	for (const shared_ptr<SignalData> d : visible_data)
	318	{
	319	const double start_time = d->get_start_time();
	320	double samplerate = d->samplerate();
	321	samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
	322
	323	left_time = min(left_time, start_time);
	324	right_time = max(right_time, start_time +
	325	d->get_max_sample_count() / samplerate);
	326	}
	327
	328	assert(left_time < right_time);
	329	return make_pair(left_time, right_time);
	330	}
	331
	332	bool View::cursors_shown() const
	333	{
	334	return _show_cursors;
	335	}
	336
	337	void View::show_cursors(bool show)
	338	{
	339	_show_cursors = show;
	340	_cursorheader->update();
	341	_viewport->update();
	342	}
	343
	344	void View::centre_cursors()
	345	{
	346	const double time_width = _scale * _viewport->width();
	347	_cursors.first()->set_time(_offset + time_width * 0.4);
	348	_cursors.second()->set_time(_offset + time_width * 0.6);
	349	_cursorheader->update();
	350	_viewport->update();
	351	}
	352
	353	CursorPair& View::cursors()
	354	{
	355	return _cursors;
	356	}
	357
	358	const CursorPair& View::cursors() const
	359	{
	360	return _cursors;
	361	}
	362
	363	const QPoint& View::hover_point() const
	364	{
	365	return _hover_point;
	366	}
	367
	368	void View::normalize_layout()
	369	{
	370	const vector< shared_ptr<RowItem> > row_items(child_items());
	371
	372	int v_min = INT_MAX;
	373	for (const shared_ptr<RowItem> r : row_items)
	374	v_min = min(r->v_offset(), v_min);
	375
	376	const int delta = -min(v_min, 0);
	377	for (shared_ptr<RowItem> r : row_items)
	378	r->set_v_offset(r->v_offset() + delta);
	379
	380	verticalScrollBar()->setSliderPosition(_v_offset + delta);
	381	v_scroll_value_changed(verticalScrollBar()->sliderPosition());
	382	}
	383
	384	void View::update_viewport()
	385	{
	386	assert(_viewport);
	387	_viewport->update();
	388	}
	389
	390	void View::get_scroll_layout(double &length, double &offset) const
	391	{
	392	const pair<double, double> extents = get_time_extents();
	393	length = (extents.second - extents.first) / _scale;
	394	offset = _offset / _scale;
	395	}
	396
	397	void View::set_zoom(double scale, int offset)
	398	{
	399	const double cursor_offset = _offset + _scale * offset;
	400	const double new_scale = max(min(scale, MaxScale), MinScale);
	401	const double new_offset = cursor_offset - new_scale * offset;
	402	set_scale_offset(new_scale, new_offset);
	403	}
	404
	405	void View::update_scroll()
	406	{
	407	assert(_viewport);
	408
	409	const QSize areaSize = _viewport->size();
	410
	411	// Set the horizontal scroll bar
	412	double length = 0, offset = 0;
	413	get_scroll_layout(length, offset);
	414	length = max(length - areaSize.width(), 0.0);
	415
	416	horizontalScrollBar()->setPageStep(areaSize.width() / 2);
	417
	418	_updating_scroll = true;
	419
	420	if (length < MaxScrollValue) {
	421	horizontalScrollBar()->setRange(0, length);
	422	horizontalScrollBar()->setSliderPosition(offset);
	423	} else {
	424	horizontalScrollBar()->setRange(0, MaxScrollValue);
	425	horizontalScrollBar()->setSliderPosition(
	426	_offset * MaxScrollValue / (_scale * length));
	427	}
	428
	429	_updating_scroll = false;
	430
	431	// Set the vertical scrollbar
	432	verticalScrollBar()->setPageStep(areaSize.height());
	433	verticalScrollBar()->setRange(0,
	434	_viewport->get_total_height() + SignalMargin -
	435	areaSize.height());
	436	}
	437
	438	void View::update_layout()
	439	{
	440	setViewportMargins(
	441	_header->sizeHint().width() - pv::view::Header::BaselineOffset,
	442	_ruler->sizeHint().height(), 0, 0);
	443	_ruler->setGeometry(_viewport->x(), 0,
	444	_viewport->width(), _viewport->y());
	445	_cursorheader->setGeometry(
	446	_viewport->x(),
	447	_ruler->sizeHint().height() - _cursorheader->sizeHint().height() / 2,
	448	_viewport->width(), _cursorheader->sizeHint().height());
	449	_header->setGeometry(0, _viewport->y(),
	450	_header->sizeHint().width(), _viewport->height());
	451	update_scroll();
	452	}
	453
	454	void View::paint_label(QPainter &p, int right, bool hover)
	455	{
	456	(void)p;
	457	(void)right;
	458	(void)hover;
	459	}
	460
	461	QRectF View::label_rect(int right)
	462	{
	463	(void)right;
	464	return QRectF();
	465	}
	466
	467	bool View::eventFilter(QObject object, QEvent event)
	468	{
	469	const QEvent::Type type = event->type();
	470	if (type == QEvent::MouseMove) {
	471
	472	const QMouseEvent const mouse_event = (QMouseEvent)event;
	473	if (object == _viewport)
	474	_hover_point = mouse_event->pos();
	475	else if (object == _ruler \|\| object == _cursorheader)
	476	_hover_point = QPoint(mouse_event->x(), 0);
	477	else if (object == _header)
	478	_hover_point = QPoint(0, mouse_event->y());
	479	else
	480	_hover_point = QPoint(-1, -1);
	481
	482	hover_point_changed();
	483
	484	} else if (type == QEvent::Leave) {
	485	_hover_point = QPoint(-1, -1);
	486	hover_point_changed();
	487	}
	488
	489	return QObject::eventFilter(object, event);
	490	}
	491
	492	bool View::viewportEvent(QEvent *e)
	493	{
	494	switch(e->type()) {
	495	case QEvent::Paint:
	496	case QEvent::MouseButtonPress:
	497	case QEvent::MouseButtonRelease:
	498	case QEvent::MouseButtonDblClick:
	499	case QEvent::MouseMove:
	500	case QEvent::Wheel:
	501	case QEvent::TouchBegin:
	502	case QEvent::TouchUpdate:
	503	case QEvent::TouchEnd:
	504	return false;
	505
	506	default:
	507	return QAbstractScrollArea::viewportEvent(e);
	508	}
	509	}
	510
	511	void View::resizeEvent(QResizeEvent*)
	512	{
	513	update_layout();
	514	}
	515
	516	void View::h_scroll_value_changed(int value)
	517	{
	518	if (_updating_scroll)
	519	return;
	520
	521	const int range = horizontalScrollBar()->maximum();
	522	if (range < MaxScrollValue)
	523	_offset = _scale * value;
	524	else {
	525	double length = 0, offset;
	526	get_scroll_layout(length, offset);
	527	_offset = _scale * length * value / MaxScrollValue;
	528	}
	529
	530	_ruler->update();
	531	_cursorheader->update();
	532	_viewport->update();
	533	}
	534
	535	void View::v_scroll_value_changed(int value)
	536	{
	537	_v_offset = value;
	538	_header->update();
	539	_viewport->update();
	540	}
	541
	542	void View::signals_changed()
	543	{
	544	int offset = SignalMargin + SignalHeight;
	545	const vector< shared_ptr<RowItem> > row_items(child_items());
	546	for (shared_ptr<RowItem> r : row_items) {
	547	r->set_owner(this);
	548	r->set_v_offset(offset);
	549	offset += SignalHeight + 2 * SignalMargin;
	550	}
	551
	552	update_layout();
	553	normalize_layout();
	554	}
	555
	556	void View::data_updated()
	557	{
	558	// Update the scroll bars
	559	update_scroll();
	560
	561	// Repaint the view
	562	_viewport->update();
	563	}
	564
	565	void View::marker_time_changed()
	566	{
	567	_cursorheader->update();
	568	_viewport->update();
	569	}
	570
	571	void View::on_signals_moved()
	572	{
	573	update_scroll();
	574	signals_moved();
	575	}
	576
	577	void View::on_geometry_updated()
	578	{
	579	update_layout();
	580	}
	581
	582	void View::on_hover_point_changed()
	583	{
	584	const vector< shared_ptr<RowItem> > row_items(child_items());
	585	for (shared_ptr<RowItem> r : row_items)
	586	r->hover_point_changed();
	587	}
	588
	589	} // namespace view
	590	} // namespace pv