[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(signals_moved()),
		this, SLOT(on_signals_moved()));

	connect(_header, SIGNAL(selection_changed()),
		_cursorheader, SLOT(clear_selection()));
	connect(_cursorheader, SIGNAL(selection_changed()),
		_header, SLOT(clear_selection()));

	connect(_header, SIGNAL(selection_changed()),
		this, SIGNAL(selection_changed()));
	connect(_cursorheader, SIGNAL(selection_changed()),
		this, SIGNAL(selection_changed()));

	connect(this, SIGNAL(hover_point_changed()),
		this, SLOT(on_hover_point_changed()));

	connect(&_lazy_event_handler, SIGNAL(timeout()),
		this, SLOT(process_sticky_events()));
	_lazy_event_handler.setSingleShot(true);

	setViewport(_viewport);

	_viewport->installEventFilter(this);
	_ruler->installEventFilter(this);
	_cursorheader->installEventFilter(this);
	_header->installEventFilter(this);

	// Trigger the initial event manually. The default device has signals
	// which were created before this object came into being
	signals_changed();

	// make sure the transparent widgets are on the top
	_cursorheader->raise();
	_header->raise();
}

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::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::appearance_changed(bool label, bool content)
{
	if (label)
		_header->update();
	if (content)
		_viewport->update();
}

void View::extents_changed(bool horz, bool vert)
{
	_sticky_events |=
		(horz ? SelectableItemHExtentsChanged : 0) |
		(vert ? SelectableItemVExtentsChanged : 0);
	_lazy_event_handler.start();
}

void View::h_scroll_value_changed(int value)
{
	if (_updating_scroll)
		return;

	const int range = horizontalScrollBar()->maximum();
	if (range < MaxScrollValue)
		_offset = _scale * value;
	else {
		double length = 0, offset;
		get_scroll_layout(length, offset);
		_offset = _scale * length * value / MaxScrollValue;
	}

	_ruler->update();
	_cursorheader->update();
	_viewport->update();
}

void View::v_scroll_value_changed(int value)
{
	_v_offset = value;
	_header->update();
	_viewport->update();
}

void View::signals_changed()
{
	// 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->force_to_v_offset(offset);
		if (r->enabled())
			offset += extents.second;
	}

	update_layout();
}

void View::data_updated()
{
	// Update the scroll bars
	update_scroll();

	// Repaint the view
	_viewport->update();
}

void View::marker_time_changed()
{
	_cursorheader->update();
	_viewport->update();
}

void View::on_signals_moved()
{
	update_scroll();
	signals_moved();
}

void View::process_sticky_events()
{
	if (_sticky_events & SelectableItemHExtentsChanged)
		update_layout();
	if (_sticky_events & SelectableItemVExtentsChanged) {
		_viewport->update();
		_header->update();
	}

	// Clear the sticky events
	_sticky_events = 0;
}

void View::on_hover_point_changed()
{
	for (shared_ptr<RowItem> r : *this)
		r->hover_point_changed();
}

} // namespace view
} // namespace pv
Commit	Line	Data
	1	/*
	2	* This file is part of the PulseView project.
	3	*
	4	* Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#ifdef ENABLE_DECODE
	22	#include <libsigrokdecode/libsigrokdecode.h>
	23	#endif
	24
	25	#include <cassert>
	26	#include <climits>
	27	#include <cmath>
	28	#include <mutex>
	29
	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(signals_moved()),
	109	this, SLOT(on_signals_moved()));
	110
	111	connect(_header, SIGNAL(selection_changed()),
	112	_cursorheader, SLOT(clear_selection()));
	113	connect(_cursorheader, SIGNAL(selection_changed()),
	114	_header, SLOT(clear_selection()));
	115
	116	connect(_header, SIGNAL(selection_changed()),
	117	this, SIGNAL(selection_changed()));
	118	connect(_cursorheader, SIGNAL(selection_changed()),
	119	this, SIGNAL(selection_changed()));
	120
	121	connect(this, SIGNAL(hover_point_changed()),
	122	this, SLOT(on_hover_point_changed()));
	123
	124	connect(&_lazy_event_handler, SIGNAL(timeout()),
	125	this, SLOT(process_sticky_events()));
	126	_lazy_event_handler.setSingleShot(true);
	127
	128	setViewport(_viewport);
	129
	130	_viewport->installEventFilter(this);
	131	_ruler->installEventFilter(this);
	132	_cursorheader->installEventFilter(this);
	133	_header->installEventFilter(this);
	134
	135	// Trigger the initial event manually. The default device has signals
	136	// which were created before this object came into being
	137	signals_changed();
	138
	139	// make sure the transparent widgets are on the top
	140	_cursorheader->raise();
	141	_header->raise();
	142	}
	143
	144	SigSession& View::session()
	145	{
	146	return _session;
	147	}
	148
	149	const SigSession& View::session() const
	150	{
	151	return _session;
	152	}
	153
	154	View* View::view()
	155	{
	156	return this;
	157	}
	158
	159	const View* View::view() const
	160	{
	161	return this;
	162	}
	163
	164	Viewport* View::viewport()
	165	{
	166	return _viewport;
	167	}
	168
	169	const Viewport* View::viewport() const
	170	{
	171	return _viewport;
	172	}
	173
	174	double View::scale() const
	175	{
	176	return _scale;
	177	}
	178
	179	double View::offset() const
	180	{
	181	return _offset;
	182	}
	183
	184	int View::owner_v_offset() const
	185	{
	186	return -_v_offset;
	187	}
	188
	189	void View::zoom(double steps)
	190	{
	191	zoom(steps, _viewport->width() / 2);
	192	}
	193
	194	void View::zoom(double steps, int offset)
	195	{
	196	set_zoom(_scale * pow(3.0/2.0, -steps), offset);
	197	}
	198
	199	void View::zoom_fit()
	200	{
	201	const pair<double, double> extents = get_time_extents();
	202	const double delta = extents.second - extents.first;
	203	if (delta < 1e-12)
	204	return;
	205
	206	assert(_viewport);
	207	const int w = _viewport->width();
	208	if (w <= 0)
	209	return;
	210
	211	const double scale = max(min(delta / w, MaxScale), MinScale);
	212	set_scale_offset(scale, extents.first);
	213	}
	214
	215	void View::zoom_one_to_one()
	216	{
	217	using pv::data::SignalData;
	218
	219	// Make a set of all the visible data objects
	220	set< shared_ptr<SignalData> > visible_data = get_visible_data();
	221	if (visible_data.empty())
	222	return;
	223
	224	double samplerate = 0.0;
	225	for (const shared_ptr<SignalData> d : visible_data) {
	226	assert(d);
	227	samplerate = max(samplerate, d->samplerate());
	228	}
	229
	230	if (samplerate == 0.0)
	231	return;
	232
	233	assert(_viewport);
	234	const int w = _viewport->width();
	235	if (w <= 0)
	236	return;
	237
	238	set_zoom(1.0 / samplerate, w / 2);
	239	}
	240
	241	void View::set_scale_offset(double scale, double offset)
	242	{
	243	_scale = scale;
	244	_offset = offset;
	245
	246	update_scroll();
	247	_ruler->update();
	248	_cursorheader->update();
	249	_viewport->update();
	250	scale_offset_changed();
	251	}
	252
	253	set< shared_ptr<SignalData> > View::get_visible_data() const
	254	{
	255	shared_lock<shared_mutex> lock(session().signals_mutex());
	256	const vector< shared_ptr<Signal> > &sigs(session().signals());
	257
	258	// Make a set of all the visible data objects
	259	set< shared_ptr<SignalData> > visible_data;
	260	for (const shared_ptr<Signal> sig : sigs)
	261	if (sig->enabled())
	262	visible_data.insert(sig->data());
	263
	264	return visible_data;
	265	}
	266
	267	pair<double, double> View::get_time_extents() const
	268	{
	269	const set< shared_ptr<SignalData> > visible_data = get_visible_data();
	270	if (visible_data.empty())
	271	return make_pair(0.0, 0.0);
	272
	273	double left_time = DBL_MAX, right_time = DBL_MIN;
	274	for (const shared_ptr<SignalData> d : visible_data)
	275	{
	276	const double start_time = d->get_start_time();
	277	double samplerate = d->samplerate();
	278	samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
	279
	280	left_time = min(left_time, start_time);
	281	right_time = max(right_time, start_time +
	282	d->get_max_sample_count() / samplerate);
	283	}
	284
	285	assert(left_time < right_time);
	286	return make_pair(left_time, right_time);
	287	}
	288
	289	bool View::cursors_shown() const
	290	{
	291	return _show_cursors;
	292	}
	293
	294	void View::show_cursors(bool show)
	295	{
	296	_show_cursors = show;
	297	_cursorheader->update();
	298	_viewport->update();
	299	}
	300
	301	void View::centre_cursors()
	302	{
	303	const double time_width = _scale * _viewport->width();
	304	_cursors.first()->set_time(_offset + time_width * 0.4);
	305	_cursors.second()->set_time(_offset + time_width * 0.6);
	306	_cursorheader->update();
	307	_viewport->update();
	308	}
	309
	310	CursorPair& View::cursors()
	311	{
	312	return _cursors;
	313	}
	314
	315	const CursorPair& View::cursors() const
	316	{
	317	return _cursors;
	318	}
	319
	320	const QPoint& View::hover_point() const
	321	{
	322	return _hover_point;
	323	}
	324
	325	void View::update_viewport()
	326	{
	327	assert(_viewport);
	328	_viewport->update();
	329	}
	330
	331	void View::get_scroll_layout(double &length, double &offset) const
	332	{
	333	const pair<double, double> extents = get_time_extents();
	334	length = (extents.second - extents.first) / _scale;
	335	offset = _offset / _scale;
	336	}
	337
	338	void View::set_zoom(double scale, int offset)
	339	{
	340	const double cursor_offset = _offset + _scale * offset;
	341	const double new_scale = max(min(scale, MaxScale), MinScale);
	342	const double new_offset = cursor_offset - new_scale * offset;
	343	set_scale_offset(new_scale, new_offset);
	344	}
	345
	346	void View::update_scroll()
	347	{
	348	assert(_viewport);
	349
	350	const QSize areaSize = _viewport->size();
	351
	352	// Set the horizontal scroll bar
	353	double length = 0, offset = 0;
	354	get_scroll_layout(length, offset);
	355	length = max(length - areaSize.width(), 0.0);
	356
	357	horizontalScrollBar()->setPageStep(areaSize.width() / 2);
	358
	359	_updating_scroll = true;
	360
	361	if (length < MaxScrollValue) {
	362	horizontalScrollBar()->setRange(0, length);
	363	horizontalScrollBar()->setSliderPosition(offset);
	364	} else {
	365	horizontalScrollBar()->setRange(0, MaxScrollValue);
	366	horizontalScrollBar()->setSliderPosition(
	367	_offset * MaxScrollValue / (_scale * length));
	368	}
	369
	370	_updating_scroll = false;
	371
	372	// Set the vertical scrollbar
	373	verticalScrollBar()->setPageStep(areaSize.height());
	374
	375	const pair<int, int> extents = v_extents();
	376	const int extra_scroll_height = (extents.second - extents.first) / 4;
	377	verticalScrollBar()->setRange(extents.first - extra_scroll_height,
	378	extents.first + extra_scroll_height);
	379	}
	380
	381	void View::update_layout()
	382	{
	383	setViewportMargins(
	384	_header->sizeHint().width() - pv::view::Header::BaselineOffset,
	385	_ruler->sizeHint().height(), 0, 0);
	386	_ruler->setGeometry(_viewport->x(), 0,
	387	_viewport->width(), _viewport->y());
	388	_cursorheader->setGeometry(
	389	_viewport->x(),
	390	_ruler->sizeHint().height() - _cursorheader->sizeHint().height() / 2,
	391	_viewport->width(), _cursorheader->sizeHint().height());
	392	_header->setGeometry(0, _viewport->y(),
	393	_header->sizeHint().width(), _viewport->height());
	394	update_scroll();
	395	}
	396
	397	void View::paint_label(QPainter &p, int right, bool hover)
	398	{
	399	(void)p;
	400	(void)right;
	401	(void)hover;
	402	}
	403
	404	QRectF View::label_rect(int right)
	405	{
	406	(void)right;
	407	return QRectF();
	408	}
	409
	410	bool View::eventFilter(QObject object, QEvent event)
	411	{
	412	const QEvent::Type type = event->type();
	413	if (type == QEvent::MouseMove) {
	414
	415	const QMouseEvent const mouse_event = (QMouseEvent)event;
	416	if (object == _viewport)
	417	_hover_point = mouse_event->pos();
	418	else if (object == _ruler \|\| object == _cursorheader)
	419	_hover_point = QPoint(mouse_event->x(), 0);
	420	else if (object == _header)
	421	_hover_point = QPoint(0, mouse_event->y());
	422	else
	423	_hover_point = QPoint(-1, -1);
	424
	425	hover_point_changed();
	426
	427	} else if (type == QEvent::Leave) {
	428	_hover_point = QPoint(-1, -1);
	429	hover_point_changed();
	430	}
	431
	432	return QObject::eventFilter(object, event);
	433	}
	434
	435	bool View::viewportEvent(QEvent *e)
	436	{
	437	switch(e->type()) {
	438	case QEvent::Paint:
	439	case QEvent::MouseButtonPress:
	440	case QEvent::MouseButtonRelease:
	441	case QEvent::MouseButtonDblClick:
	442	case QEvent::MouseMove:
	443	case QEvent::Wheel:
	444	case QEvent::TouchBegin:
	445	case QEvent::TouchUpdate:
	446	case QEvent::TouchEnd:
	447	return false;
	448
	449	default:
	450	return QAbstractScrollArea::viewportEvent(e);
	451	}
	452	}
	453
	454	void View::resizeEvent(QResizeEvent*)
	455	{
	456	update_layout();
	457	}
	458
	459	void View::appearance_changed(bool label, bool content)
	460	{
	461	if (label)
	462	_header->update();
	463	if (content)
	464	_viewport->update();
	465	}
	466
	467	void View::extents_changed(bool horz, bool vert)
	468	{
	469	_sticky_events \|=
	470	(horz ? SelectableItemHExtentsChanged : 0) \|
	471	(vert ? SelectableItemVExtentsChanged : 0);
	472	_lazy_event_handler.start();
	473	}
	474
	475	void View::h_scroll_value_changed(int value)
	476	{
	477	if (_updating_scroll)
	478	return;
	479
	480	const int range = horizontalScrollBar()->maximum();
	481	if (range < MaxScrollValue)
	482	_offset = _scale * value;
	483	else {
	484	double length = 0, offset;
	485	get_scroll_layout(length, offset);
	486	_offset = _scale * length * value / MaxScrollValue;
	487	}
	488
	489	_ruler->update();
	490	_cursorheader->update();
	491	_viewport->update();
	492	}
	493
	494	void View::v_scroll_value_changed(int value)
	495	{
	496	_v_offset = value;
	497	_header->update();
	498	_viewport->update();
	499	}
	500
	501	void View::signals_changed()
	502	{
	503	// Populate the traces
	504	clear_child_items();
	505
	506	shared_lock<shared_mutex> lock(session().signals_mutex());
	507	const vector< shared_ptr<Signal> > &sigs(session().signals());
	508	for (auto s : sigs)
	509	add_child_item(s);
	510
	511	#ifdef ENABLE_DECODE
	512	const vector< shared_ptr<DecodeTrace> > decode_sigs(
	513	session().get_decode_signals());
	514	for (auto s : decode_sigs)
	515	add_child_item(s);
	516	#endif
	517
	518	// Create the initial layout
	519	int offset = 0;
	520	for (shared_ptr<RowItem> r : *this) {
	521	const pair<int, int> extents = r->v_extents();
	522	if (r->enabled())
	523	offset += -extents.first;
	524	r->force_to_v_offset(offset);
	525	if (r->enabled())
	526	offset += extents.second;
	527	}
	528
	529	update_layout();
	530	}
	531
	532	void View::data_updated()
	533	{
	534	// Update the scroll bars
	535	update_scroll();
	536
	537	// Repaint the view
	538	_viewport->update();
	539	}
	540
	541	void View::marker_time_changed()
	542	{
	543	_cursorheader->update();
	544	_viewport->update();
	545	}
	546
	547	void View::on_signals_moved()
	548	{
	549	update_scroll();
	550	signals_moved();
	551	}
	552
	553	void View::process_sticky_events()
	554	{
	555	if (_sticky_events & SelectableItemHExtentsChanged)
	556	update_layout();
	557	if (_sticky_events & SelectableItemVExtentsChanged) {
	558	_viewport->update();
	559	_header->update();
	560	}
	561
	562	// Clear the sticky events
	563	_sticky_events = 0;
	564	}
	565
	566	void View::on_hover_point_changed()
	567	{
	568	for (shared_ptr<RowItem> r : *this)
	569	r->hover_point_changed();
	570	}
	571
	572	} // namespace view
	573	} // namespace pv