[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 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());

	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::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 = 0;
	for (shared_ptr<RowItem> r : *this) {
		const pair<int, int> extents = r->v_extents();
		if (r->enabled())
			offset += -extents.first;
		r->set_v_offset(offset);
		if (r->enabled())
			offset += extents.second;
	}

	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 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	// Make a set of all the visible data objects
	218	set< shared_ptr<SignalData> > visible_data = get_visible_data();
	219	if (visible_data.empty())
	220	return;
	221
	222	double samplerate = 0.0;
	223	for (const shared_ptr<SignalData> d : visible_data) {
	224	assert(d);
	225	samplerate = max(samplerate, d->samplerate());
	226	}
	227
	228	if (samplerate == 0.0)
	229	return;
	230
	231	assert(_viewport);
	232	const int w = _viewport->width();
	233	if (w <= 0)
	234	return;
	235
	236	set_zoom(1.0 / samplerate, w / 2);
	237	}
	238
	239	void View::set_scale_offset(double scale, double offset)
	240	{
	241	_scale = scale;
	242	_offset = offset;
	243
	244	update_scroll();
	245	_ruler->update();
	246	_cursorheader->update();
	247	_viewport->update();
	248	scale_offset_changed();
	249	}
	250
	251	set< shared_ptr<SignalData> > View::get_visible_data() const
	252	{
	253	shared_lock<shared_mutex> lock(session().signals_mutex());
	254	const vector< shared_ptr<Signal> > &sigs(session().signals());
	255
	256	// Make a set of all the visible data objects
	257	set< shared_ptr<SignalData> > visible_data;
	258	for (const shared_ptr<Signal> sig : sigs)
	259	if (sig->enabled())
	260	visible_data.insert(sig->data());
	261
	262	return visible_data;
	263	}
	264
	265	pair<double, double> View::get_time_extents() const
	266	{
	267	const set< shared_ptr<SignalData> > visible_data = get_visible_data();
	268	if (visible_data.empty())
	269	return make_pair(0.0, 0.0);
	270
	271	double left_time = DBL_MAX, right_time = DBL_MIN;
	272	for (const shared_ptr<SignalData> d : visible_data)
	273	{
	274	const double start_time = d->get_start_time();
	275	double samplerate = d->samplerate();
	276	samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
	277
	278	left_time = min(left_time, start_time);
	279	right_time = max(right_time, start_time +
	280	d->get_max_sample_count() / samplerate);
	281	}
	282
	283	assert(left_time < right_time);
	284	return make_pair(left_time, right_time);
	285	}
	286
	287	bool View::cursors_shown() const
	288	{
	289	return _show_cursors;
	290	}
	291
	292	void View::show_cursors(bool show)
	293	{
	294	_show_cursors = show;
	295	_cursorheader->update();
	296	_viewport->update();
	297	}
	298
	299	void View::centre_cursors()
	300	{
	301	const double time_width = _scale * _viewport->width();
	302	_cursors.first()->set_time(_offset + time_width * 0.4);
	303	_cursors.second()->set_time(_offset + time_width * 0.6);
	304	_cursorheader->update();
	305	_viewport->update();
	306	}
	307
	308	CursorPair& View::cursors()
	309	{
	310	return _cursors;
	311	}
	312
	313	const CursorPair& View::cursors() const
	314	{
	315	return _cursors;
	316	}
	317
	318	const QPoint& View::hover_point() const
	319	{
	320	return _hover_point;
	321	}
	322
	323	void View::normalize_layout()
	324	{
	325	int v_min = INT_MAX;
	326	for (const shared_ptr<RowItem> r : *this)
	327	v_min = min(r->v_offset(), v_min);
	328
	329	const int delta = -min(v_min, 0);
	330	for (shared_ptr<RowItem> r : *this)
	331	r->set_v_offset(r->v_offset() + delta);
	332
	333	verticalScrollBar()->setSliderPosition(_v_offset + delta);
	334	v_scroll_value_changed(verticalScrollBar()->sliderPosition());
	335	}
	336
	337	void View::update_viewport()
	338	{
	339	assert(_viewport);
	340	_viewport->update();
	341	}
	342
	343	void View::get_scroll_layout(double &length, double &offset) const
	344	{
	345	const pair<double, double> extents = get_time_extents();
	346	length = (extents.second - extents.first) / _scale;
	347	offset = _offset / _scale;
	348	}
	349
	350	void View::set_zoom(double scale, int offset)
	351	{
	352	const double cursor_offset = _offset + _scale * offset;
	353	const double new_scale = max(min(scale, MaxScale), MinScale);
	354	const double new_offset = cursor_offset - new_scale * offset;
	355	set_scale_offset(new_scale, new_offset);
	356	}
	357
	358	void View::update_scroll()
	359	{
	360	assert(_viewport);
	361
	362	const QSize areaSize = _viewport->size();
	363
	364	// Set the horizontal scroll bar
	365	double length = 0, offset = 0;
	366	get_scroll_layout(length, offset);
	367	length = max(length - areaSize.width(), 0.0);
	368
	369	horizontalScrollBar()->setPageStep(areaSize.width() / 2);
	370
	371	_updating_scroll = true;
	372
	373	if (length < MaxScrollValue) {
	374	horizontalScrollBar()->setRange(0, length);
	375	horizontalScrollBar()->setSliderPosition(offset);
	376	} else {
	377	horizontalScrollBar()->setRange(0, MaxScrollValue);
	378	horizontalScrollBar()->setSliderPosition(
	379	_offset * MaxScrollValue / (_scale * length));
	380	}
	381
	382	_updating_scroll = false;
	383
	384	// Set the vertical scrollbar
	385	verticalScrollBar()->setPageStep(areaSize.height());
	386
	387	const pair<int, int> extents = v_extents();
	388	const int extra_scroll_height = (extents.second - extents.first) / 4;
	389	verticalScrollBar()->setRange(extents.first - extra_scroll_height,
	390	extents.first + extra_scroll_height);
	391	}
	392
	393	void View::update_layout()
	394	{
	395	setViewportMargins(
	396	_header->sizeHint().width() - pv::view::Header::BaselineOffset,
	397	_ruler->sizeHint().height(), 0, 0);
	398	_ruler->setGeometry(_viewport->x(), 0,
	399	_viewport->width(), _viewport->y());
	400	_cursorheader->setGeometry(
	401	_viewport->x(),
	402	_ruler->sizeHint().height() - _cursorheader->sizeHint().height() / 2,
	403	_viewport->width(), _cursorheader->sizeHint().height());
	404	_header->setGeometry(0, _viewport->y(),
	405	_header->sizeHint().width(), _viewport->height());
	406	update_scroll();
	407	}
	408
	409	void View::paint_label(QPainter &p, int right, bool hover)
	410	{
	411	(void)p;
	412	(void)right;
	413	(void)hover;
	414	}
	415
	416	QRectF View::label_rect(int right)
	417	{
	418	(void)right;
	419	return QRectF();
	420	}
	421
	422	bool View::eventFilter(QObject object, QEvent event)
	423	{
	424	const QEvent::Type type = event->type();
	425	if (type == QEvent::MouseMove) {
	426
	427	const QMouseEvent const mouse_event = (QMouseEvent)event;
	428	if (object == _viewport)
	429	_hover_point = mouse_event->pos();
	430	else if (object == _ruler \|\| object == _cursorheader)
	431	_hover_point = QPoint(mouse_event->x(), 0);
	432	else if (object == _header)
	433	_hover_point = QPoint(0, mouse_event->y());
	434	else
	435	_hover_point = QPoint(-1, -1);
	436
	437	hover_point_changed();
	438
	439	} else if (type == QEvent::Leave) {
	440	_hover_point = QPoint(-1, -1);
	441	hover_point_changed();
	442	}
	443
	444	return QObject::eventFilter(object, event);
	445	}
	446
	447	bool View::viewportEvent(QEvent *e)
	448	{
	449	switch(e->type()) {
	450	case QEvent::Paint:
	451	case QEvent::MouseButtonPress:
	452	case QEvent::MouseButtonRelease:
	453	case QEvent::MouseButtonDblClick:
	454	case QEvent::MouseMove:
	455	case QEvent::Wheel:
	456	case QEvent::TouchBegin:
	457	case QEvent::TouchUpdate:
	458	case QEvent::TouchEnd:
	459	return false;
	460
	461	default:
	462	return QAbstractScrollArea::viewportEvent(e);
	463	}
	464	}
	465
	466	void View::resizeEvent(QResizeEvent*)
	467	{
	468	update_layout();
	469	}
	470
	471	void View::h_scroll_value_changed(int value)
	472	{
	473	if (_updating_scroll)
	474	return;
	475
	476	const int range = horizontalScrollBar()->maximum();
	477	if (range < MaxScrollValue)
	478	_offset = _scale * value;
	479	else {
	480	double length = 0, offset;
	481	get_scroll_layout(length, offset);
	482	_offset = _scale * length * value / MaxScrollValue;
	483	}
	484
	485	_ruler->update();
	486	_cursorheader->update();
	487	_viewport->update();
	488	}
	489
	490	void View::v_scroll_value_changed(int value)
	491	{
	492	_v_offset = value;
	493	_header->update();
	494	_viewport->update();
	495	}
	496
	497	void View::signals_changed()
	498	{
	499	// Populate the traces
	500	clear_child_items();
	501
	502	shared_lock<shared_mutex> lock(session().signals_mutex());
	503	const vector< shared_ptr<Signal> > &sigs(session().signals());
	504	for (auto s : sigs)
	505	add_child_item(s);
	506
	507	#ifdef ENABLE_DECODE
	508	const vector< shared_ptr<DecodeTrace> > decode_sigs(
	509	session().get_decode_signals());
	510	for (auto s : decode_sigs)
	511	add_child_item(s);
	512	#endif
	513
	514	// Create the initial layout
	515	int offset = 0;
	516	for (shared_ptr<RowItem> r : *this) {
	517	const pair<int, int> extents = r->v_extents();
	518	if (r->enabled())
	519	offset += -extents.first;
	520	r->set_v_offset(offset);
	521	if (r->enabled())
	522	offset += extents.second;
	523	}
	524
	525	update_layout();
	526	normalize_layout();
	527
	528	// Update the child widgets
	529	_header->signals_updated();
	530	_viewport->signals_updated();
	531	}
	532
	533	void View::data_updated()
	534	{
	535	// Update the scroll bars
	536	update_scroll();
	537
	538	// Repaint the view
	539	_viewport->update();
	540	}
	541
	542	void View::marker_time_changed()
	543	{
	544	_cursorheader->update();
	545	_viewport->update();
	546	}
	547
	548	void View::on_signals_moved()
	549	{
	550	update_scroll();
	551	signals_moved();
	552	}
	553
	554	void View::on_geometry_updated()
	555	{
	556	update_layout();
	557	}
	558
	559	void View::on_hover_point_changed()
	560	{
	561	for (shared_ptr<RowItem> r : *this)
	562	r->hover_point_changed();
	563	}
	564
	565	} // namespace view
	566	} // namespace pv