[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::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(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()));

	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;
}

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

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

int View::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<Trace> > View::get_traces() const
{
	const vector< shared_ptr<Signal> > sigs(
		session().get_signals());
#ifdef ENABLE_DECODE
	const vector< shared_ptr<DecodeTrace> > decode_sigs(
		session().get_decode_signals());
	vector< shared_ptr<Trace> > traces(
		sigs.size() + decode_sigs.size());
#else
	vector< shared_ptr<Trace> > traces(sigs.size());
#endif

	auto i = traces.begin();
	i = copy(sigs.begin(), sigs.end(), i);
#ifdef ENABLE_DECODE
	i = copy(decode_sigs.begin(), decode_sigs.end(), i);
#endif

	stable_sort(traces.begin(), traces.end(), compare_trace_v_offsets);
	return traces;
}

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

	// List the selected signals
	const vector< shared_ptr<Trace> > traces(get_traces());
	for (shared_ptr<Trace> t : traces) {
		assert(t);
		if (t->selected())
			items.push_back(t);
	}

	// 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<Trace> > traces(get_traces());

	int v_min = INT_MAX;
	for (const shared_ptr<Trace> t : traces)
		v_min = min(t->get_v_offset(), v_min);

	const int delta = -min(v_min, 0);
	for (shared_ptr<Trace> t : traces)
		t->set_v_offset(t->get_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();
}

bool View::compare_trace_v_offsets(const shared_ptr<Trace> &a,
	const shared_ptr<Trace> &b)
{
	assert(a);
	assert(b);
	return a->get_v_offset() < b->get_v_offset();
}

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<Trace> > traces(get_traces());
	for (shared_ptr<Trace> t : traces) {
		t->set_view(this);
		t->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();
}

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