[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 <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 boost::shared_lock;
using boost::shared_mutex;
using pv::data::SignalData;
using std::back_inserter;
using std::deque;
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::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 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;

	// 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::normalize_layout()
{
	int v_min = INT_MAX;
	for (const shared_ptr<RowItem> r : *this)
		v_min = min(r->v_offset(), v_min);

	const int delta = -min(v_min, 0);
	for (shared_ptr<RowItem> r : *this)
		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()
{
	// Populate the traces
	clear_child_items();

	shared_lock<shared_mutex> lock(session().signals_mutex());
	const vector< shared_ptr<Signal> > &sigs(session().signals());
	for (auto s : sigs)
		add_child_item(s);

#ifdef ENABLE_DECODE
	const vector< shared_ptr<DecodeTrace> > decode_sigs(
		session().get_decode_signals());
	for (auto s : decode_sigs)
		add_child_item(s);
#endif

	// Create the initial layout
	int offset = SignalMargin + SignalHeight;
	for (shared_ptr<RowItem> r : *this) {
		r->set_v_offset(offset);
		offset += SignalHeight + 2 * SignalMargin;
	}

	update_layout();
	normalize_layout();

	// Update the child widgets
	_header->signals_updated();
	_viewport->signals_updated();
}

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