[pulseview.git] / pv / view / view.cpp

/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#ifdef ENABLE_DECODE
#include <libsigrokdecode/libsigrokdecode.h>
#endif

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

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

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

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

using pv::data::SignalData;
using std::back_inserter;
using std::deque;
using std::list;
using std::max;
using std::make_pair;
using std::min;
using std::pair;
using std::set;
using std::shared_ptr;
using std::vector;
using std::weak_ptr;

namespace pv {
namespace view {

const double View::MaxScale = 1e9;
const double View::MinScale = 1e-15;

const int View::MaxScrollValue = INT_MAX / 2;

const int View::SignalHeight = 30;
const int View::SignalMargin = 10;
const int View::SignalSnapGridSize = 10;

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

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

View::View(SigSession &session, QWidget *parent) :
	QAbstractScrollArea(parent),
	_session(session),
	_viewport(new Viewport(*this)),
	_ruler(new Ruler(*this)),
	_cursorheader(new CursorHeader(*this)),
	_header(new Header(*this)),
	_scale(1e-6),
	_offset(0),
	_v_offset(0),
	_updating_scroll(false),
	_show_cursors(false),
	_cursors(*this),
	_hover_point(-1, -1)
{
	connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
		this, SLOT(h_scroll_value_changed(int)));
	connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
		this, SLOT(v_scroll_value_changed(int)));

	connect(&_session, SIGNAL(signals_changed()),
		this, SLOT(signals_changed()));
	connect(&_session, SIGNAL(capture_state_changed(int)),
		this, SLOT(data_updated()));
	connect(&_session, SIGNAL(data_received()),
		this, SLOT(data_updated()));
	connect(&_session, SIGNAL(frame_ended()),
		this, SLOT(data_updated()));

	connect(_cursors.first().get(), SIGNAL(time_changed()),
		this, SLOT(marker_time_changed()));
	connect(_cursors.second().get(), SIGNAL(time_changed()),
		this, SLOT(marker_time_changed()));

	connect(_header, SIGNAL(geometry_updated()),
		this, SLOT(on_geometry_updated()));
	connect(_header, SIGNAL(signals_moved()),
		this, SLOT(on_signals_moved()));

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

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

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

	setViewport(_viewport);

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

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

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

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

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

View* View::view()
{
	return this;
}

const View* View::view() const
{
	return this;
}

Viewport* View::viewport()
{
	return _viewport;
}

const Viewport* View::viewport() const
{
	return _viewport;
}

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

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

int View::owner_v_offset() const
{
	return -_v_offset;
}

void View::zoom(double steps)
{
	zoom(steps, _viewport->width() / 2);
}

void View::zoom(double steps, int offset)
{
	set_zoom(_scale * pow(3.0/2.0, -steps), offset);
}

void View::zoom_fit()
{
	const pair<double, double> extents = get_time_extents();
	const double delta = extents.second - extents.first;
	if (delta < 1e-12)
		return;

	assert(_viewport);
	const int w = _viewport->width();
	if (w <= 0)
		return;

	const double scale = max(min(delta / w, MaxScale), MinScale);
	set_scale_offset(scale, extents.first);
}

void View::zoom_one_to_one()
{
	using pv::data::SignalData;

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

	// Make a set of all the visible data objects
	set< shared_ptr<SignalData> > visible_data = get_visible_data();
	if (visible_data.empty())
		return;

	double samplerate = 0.0;
	for (const shared_ptr<SignalData> d : visible_data) {
		assert(d);
		samplerate = max(samplerate, d->samplerate());
	}

	if (samplerate == 0.0)
		return;

	assert(_viewport);
	const int w = _viewport->width();
	if (w <= 0)
		return;

	set_zoom(1.0 / samplerate, w / 2);
}

void View::set_scale_offset(double scale, double offset)
{
	_scale = scale;
	_offset = offset;

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

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

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

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

	return items;
}

set< shared_ptr<SignalData> > View::get_visible_data() const
{
	const vector< shared_ptr<Signal> > sigs(
		session().get_signals());

	// Make a set of all the visible data objects
	set< shared_ptr<SignalData> > visible_data;
	for (const shared_ptr<Signal> sig : sigs)
		if (sig->enabled())
			visible_data.insert(sig->data());

	return visible_data;
}

pair<double, double> View::get_time_extents() const
{
	const set< shared_ptr<SignalData> > visible_data = get_visible_data();
	if (visible_data.empty())
		return make_pair(0.0, 0.0);

	double left_time = DBL_MAX, right_time = DBL_MIN;
	for (const shared_ptr<SignalData> d : visible_data)
	{
		const double start_time = d->get_start_time();
		double samplerate = d->samplerate();
		samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;

		left_time = min(left_time, start_time);
		right_time = max(right_time, start_time +
			d->get_max_sample_count() / samplerate);
	}

	assert(left_time < right_time);
	return make_pair(left_time, right_time);
}

bool View::cursors_shown() const
{
	return _show_cursors;
}

void View::show_cursors(bool show)
{
	_show_cursors = show;
	_cursorheader->update();
	_viewport->update();
}

void View::centre_cursors()
{
	const double time_width = _scale * _viewport->width();
	_cursors.first()->set_time(_offset + time_width * 0.4);
	_cursors.second()->set_time(_offset + time_width * 0.6);
	_cursorheader->update();
	_viewport->update();
}

CursorPair& View::cursors()
{
	return _cursors;
}

const CursorPair& View::cursors() const
{
	return _cursors;
}

const QPoint& View::hover_point() const
{
	return _hover_point;
}

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

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

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

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

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

void View::get_scroll_layout(double &length, double &offset) const
{
	const pair<double, double> extents = get_time_extents();
	length = (extents.second - extents.first) / _scale;
	offset = _offset / _scale;
}

void View::set_zoom(double scale, int offset)
{
	const double cursor_offset = _offset + _scale * offset;
	const double new_scale = max(min(scale, MaxScale), MinScale);
	const double new_offset = cursor_offset - new_scale * offset;
	set_scale_offset(new_scale, new_offset);
}

void View::update_scroll()
{
	assert(_viewport);

	const QSize areaSize = _viewport->size();

	// Set the horizontal scroll bar
	double length = 0, offset = 0;
	get_scroll_layout(length, offset);
	length = max(length - areaSize.width(), 0.0);

	horizontalScrollBar()->setPageStep(areaSize.width() / 2);

	_updating_scroll = true;

	if (length < MaxScrollValue) {
		horizontalScrollBar()->setRange(0, length);
		horizontalScrollBar()->setSliderPosition(offset);
	} else {
		horizontalScrollBar()->setRange(0, MaxScrollValue);
		horizontalScrollBar()->setSliderPosition(
			_offset * MaxScrollValue / (_scale * length));
	}

	_updating_scroll = false;

	// Set the vertical scrollbar
	verticalScrollBar()->setPageStep(areaSize.height());
	verticalScrollBar()->setRange(0,
		_viewport->get_total_height() + SignalMargin -
		areaSize.height());
}

void View::update_layout()
{
	setViewportMargins(
		_header->sizeHint().width() - pv::view::Header::BaselineOffset,
		_ruler->sizeHint().height(), 0, 0);
	_ruler->setGeometry(_viewport->x(), 0,
		_viewport->width(), _viewport->y());
	_cursorheader->setGeometry(
		_viewport->x(),
		_ruler->sizeHint().height() - _cursorheader->sizeHint().height() / 2,
		_viewport->width(), _cursorheader->sizeHint().height());
	_header->setGeometry(0, _viewport->y(),
		_header->sizeHint().width(), _viewport->height());
	update_scroll();
}

void View::paint_label(QPainter &p, int right, bool hover)
{
	(void)p;
	(void)right;
	(void)hover;
}

QRectF View::label_rect(int right)
{
	(void)right;
	return QRectF();
}

bool View::eventFilter(QObject *object, QEvent *event)
{
	const QEvent::Type type = event->type();
	if (type == QEvent::MouseMove) {

		const QMouseEvent *const mouse_event = (QMouseEvent*)event;
		if (object == _viewport)
			_hover_point = mouse_event->pos();
		else if (object == _ruler || object == _cursorheader)
			_hover_point = QPoint(mouse_event->x(), 0);
		else if (object == _header)
			_hover_point = QPoint(0, mouse_event->y());
		else
			_hover_point = QPoint(-1, -1);

		hover_point_changed();

	} else if (type == QEvent::Leave) {
		_hover_point = QPoint(-1, -1);
		hover_point_changed();
	}

	return QObject::eventFilter(object, event);
}

bool View::viewportEvent(QEvent *e)
{
	switch(e->type()) {
	case QEvent::Paint:
	case QEvent::MouseButtonPress:
	case QEvent::MouseButtonRelease:
	case QEvent::MouseButtonDblClick:
	case QEvent::MouseMove:
	case QEvent::Wheel:
	case QEvent::TouchBegin:
	case QEvent::TouchUpdate:
	case QEvent::TouchEnd:
		return false;

	default:
		return QAbstractScrollArea::viewportEvent(e);
	}
}

void View::resizeEvent(QResizeEvent*)
{
	update_layout();
}

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

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

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

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

void View::signals_changed()
{
	// Populate the traces
	clear_child_items();

	const vector< shared_ptr<Signal> > sigs(
		session().get_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 : child_items()) {
		r->set_v_offset(offset);
		offset += SignalHeight + 2 * SignalMargin;
	}

	update_layout();
	normalize_layout();
}

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

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

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

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

void View::on_geometry_updated()
{
	update_layout();
}

void View::on_hover_point_changed()
{
	const vector< shared_ptr<RowItem> > row_items(child_items());
	for (shared_ptr<RowItem> r : row_items)
		r->hover_point_changed();
}

} // namespace view
} // namespace pv
Commit	Line	Data
	1	/*
	2	* This file is part of the PulseView project.
	3	*
	4	* Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#ifdef ENABLE_DECODE
	22	#include <libsigrokdecode/libsigrokdecode.h>
	23	#endif
	24
	25	#include <assert.h>
	26	#include <limits.h>
	27	#include <math.h>
	28
	29	#include <QEvent>
	30	#include <QMouseEvent>
	31	#include <QScrollBar>
	32
	33	#include "cursorheader.h"
	34	#include "decodetrace.h"
	35	#include "header.h"
	36	#include "ruler.h"
	37	#include "signal.h"
	38	#include "view.h"
	39	#include "viewport.h"
	40
	41	#include "pv/sigsession.h"
	42	#include "pv/data/logic.h"
	43	#include "pv/data/logicsnapshot.h"
	44
	45	using pv::data::SignalData;
	46	using std::back_inserter;
	47	using std::deque;
	48	using std::list;
	49	using std::max;
	50	using std::make_pair;
	51	using std::min;
	52	using std::pair;
	53	using std::set;
	54	using std::shared_ptr;
	55	using std::vector;
	56	using std::weak_ptr;
	57
	58	namespace pv {
	59	namespace view {
	60
	61	const double View::MaxScale = 1e9;
	62	const double View::MinScale = 1e-15;
	63
	64	const int View::MaxScrollValue = INT_MAX / 2;
	65
	66	const int View::SignalHeight = 30;
	67	const int View::SignalMargin = 10;
	68	const int View::SignalSnapGridSize = 10;
	69
	70	const QColor View::CursorAreaColour(220, 231, 243);
	71
	72	const QSizeF View::LabelPadding(4, 0);
	73
	74	View::View(SigSession &session, QWidget *parent) :
	75	QAbstractScrollArea(parent),
	76	_session(session),
	77	_viewport(new Viewport(*this)),
	78	_ruler(new Ruler(*this)),
	79	_cursorheader(new CursorHeader(*this)),
	80	_header(new Header(*this)),
	81	_scale(1e-6),
	82	_offset(0),
	83	_v_offset(0),
	84	_updating_scroll(false),
	85	_show_cursors(false),
	86	_cursors(*this),
	87	_hover_point(-1, -1)
	88	{
	89	connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
	90	this, SLOT(h_scroll_value_changed(int)));
	91	connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
	92	this, SLOT(v_scroll_value_changed(int)));
	93
	94	connect(&_session, SIGNAL(signals_changed()),
	95	this, SLOT(signals_changed()));
	96	connect(&_session, SIGNAL(capture_state_changed(int)),
	97	this, SLOT(data_updated()));
	98	connect(&_session, SIGNAL(data_received()),
	99	this, SLOT(data_updated()));
	100	connect(&_session, SIGNAL(frame_ended()),
	101	this, SLOT(data_updated()));
	102
	103	connect(_cursors.first().get(), SIGNAL(time_changed()),
	104	this, SLOT(marker_time_changed()));
	105	connect(_cursors.second().get(), SIGNAL(time_changed()),
	106	this, SLOT(marker_time_changed()));
	107
	108	connect(_header, SIGNAL(geometry_updated()),
	109	this, SLOT(on_geometry_updated()));
	110	connect(_header, SIGNAL(signals_moved()),
	111	this, SLOT(on_signals_moved()));
	112
	113	connect(_header, SIGNAL(selection_changed()),
	114	_cursorheader, SLOT(clear_selection()));
	115	connect(_cursorheader, SIGNAL(selection_changed()),
	116	_header, SLOT(clear_selection()));
	117
	118	connect(_header, SIGNAL(selection_changed()),
	119	this, SIGNAL(selection_changed()));
	120	connect(_cursorheader, SIGNAL(selection_changed()),
	121	this, SIGNAL(selection_changed()));
	122
	123	connect(this, SIGNAL(hover_point_changed()),
	124	this, SLOT(on_hover_point_changed()));
	125
	126	setViewport(_viewport);
	127
	128	_viewport->installEventFilter(this);
	129	_ruler->installEventFilter(this);
	130	_cursorheader->installEventFilter(this);
	131	_header->installEventFilter(this);
	132
	133	// Trigger the initial event manually. The default device has signals
	134	// which were created before this object came into being
	135	signals_changed();
	136
	137	// make sure the transparent widgets are on the top
	138	_cursorheader->raise();
	139	_header->raise();
	140	}
	141
	142	SigSession& View::session()
	143	{
	144	return _session;
	145	}
	146
	147	const SigSession& View::session() const
	148	{
	149	return _session;
	150	}
	151
	152	View* View::view()
	153	{
	154	return this;
	155	}
	156
	157	const View* View::view() const
	158	{
	159	return this;
	160	}
	161
	162	Viewport* View::viewport()
	163	{
	164	return _viewport;
	165	}
	166
	167	const Viewport* View::viewport() const
	168	{
	169	return _viewport;
	170	}
	171
	172	double View::scale() const
	173	{
	174	return _scale;
	175	}
	176
	177	double View::offset() const
	178	{
	179	return _offset;
	180	}
	181
	182	int View::owner_v_offset() const
	183	{
	184	return -_v_offset;
	185	}
	186
	187	void View::zoom(double steps)
	188	{
	189	zoom(steps, _viewport->width() / 2);
	190	}
	191
	192	void View::zoom(double steps, int offset)
	193	{
	194	set_zoom(_scale * pow(3.0/2.0, -steps), offset);
	195	}
	196
	197	void View::zoom_fit()
	198	{
	199	const pair<double, double> extents = get_time_extents();
	200	const double delta = extents.second - extents.first;
	201	if (delta < 1e-12)
	202	return;
	203
	204	assert(_viewport);
	205	const int w = _viewport->width();
	206	if (w <= 0)
	207	return;
	208
	209	const double scale = max(min(delta / w, MaxScale), MinScale);
	210	set_scale_offset(scale, extents.first);
	211	}
	212
	213	void View::zoom_one_to_one()
	214	{
	215	using pv::data::SignalData;
	216
	217	const vector< shared_ptr<Signal> > sigs(
	218	session().get_signals());
	219
	220	// Make a set of all the visible data objects
	221	set< shared_ptr<SignalData> > visible_data = get_visible_data();
	222	if (visible_data.empty())
	223	return;
	224
	225	double samplerate = 0.0;
	226	for (const shared_ptr<SignalData> d : visible_data) {
	227	assert(d);
	228	samplerate = max(samplerate, d->samplerate());
	229	}
	230
	231	if (samplerate == 0.0)
	232	return;
	233
	234	assert(_viewport);
	235	const int w = _viewport->width();
	236	if (w <= 0)
	237	return;
	238
	239	set_zoom(1.0 / samplerate, w / 2);
	240	}
	241
	242	void View::set_scale_offset(double scale, double offset)
	243	{
	244	_scale = scale;
	245	_offset = offset;
	246
	247	update_scroll();
	248	_ruler->update();
	249	_cursorheader->update();
	250	_viewport->update();
	251	scale_offset_changed();
	252	}
	253
	254	list<weak_ptr<SelectableItem> > View::selected_items() const
	255	{
	256	list<weak_ptr<SelectableItem> > items;
	257
	258	// List the selected signals
	259	const vector< shared_ptr<RowItem> > row_items(child_items());
	260	for (shared_ptr<RowItem> r : row_items) {
	261	if (r && r->selected())
	262	items.push_back(r);
	263	}
	264
	265	// List the selected cursors
	266	if (_cursors.first()->selected())
	267	items.push_back(_cursors.first());
	268	if (_cursors.second()->selected())
	269	items.push_back(_cursors.second());
	270
	271	return items;
	272	}
	273
	274	set< shared_ptr<SignalData> > View::get_visible_data() const
	275	{
	276	const vector< shared_ptr<Signal> > sigs(
	277	session().get_signals());
	278
	279	// Make a set of all the visible data objects
	280	set< shared_ptr<SignalData> > visible_data;
	281	for (const shared_ptr<Signal> sig : sigs)
	282	if (sig->enabled())
	283	visible_data.insert(sig->data());
	284
	285	return visible_data;
	286	}
	287
	288	pair<double, double> View::get_time_extents() const
	289	{
	290	const set< shared_ptr<SignalData> > visible_data = get_visible_data();
	291	if (visible_data.empty())
	292	return make_pair(0.0, 0.0);
	293
	294	double left_time = DBL_MAX, right_time = DBL_MIN;
	295	for (const shared_ptr<SignalData> d : visible_data)
	296	{
	297	const double start_time = d->get_start_time();
	298	double samplerate = d->samplerate();
	299	samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
	300
	301	left_time = min(left_time, start_time);
	302	right_time = max(right_time, start_time +
	303	d->get_max_sample_count() / samplerate);
	304	}
	305
	306	assert(left_time < right_time);
	307	return make_pair(left_time, right_time);
	308	}
	309
	310	bool View::cursors_shown() const
	311	{
	312	return _show_cursors;
	313	}
	314
	315	void View::show_cursors(bool show)
	316	{
	317	_show_cursors = show;
	318	_cursorheader->update();
	319	_viewport->update();
	320	}
	321
	322	void View::centre_cursors()
	323	{
	324	const double time_width = _scale * _viewport->width();
	325	_cursors.first()->set_time(_offset + time_width * 0.4);
	326	_cursors.second()->set_time(_offset + time_width * 0.6);
	327	_cursorheader->update();
	328	_viewport->update();
	329	}
	330
	331	CursorPair& View::cursors()
	332	{
	333	return _cursors;
	334	}
	335
	336	const CursorPair& View::cursors() const
	337	{
	338	return _cursors;
	339	}
	340
	341	const QPoint& View::hover_point() const
	342	{
	343	return _hover_point;
	344	}
	345
	346	void View::normalize_layout()
	347	{
	348	const vector< shared_ptr<RowItem> > row_items(child_items());
	349
	350	int v_min = INT_MAX;
	351	for (const shared_ptr<RowItem> r : row_items)
	352	v_min = min(r->v_offset(), v_min);
	353
	354	const int delta = -min(v_min, 0);
	355	for (shared_ptr<RowItem> r : row_items)
	356	r->set_v_offset(r->v_offset() + delta);
	357
	358	verticalScrollBar()->setSliderPosition(_v_offset + delta);
	359	v_scroll_value_changed(verticalScrollBar()->sliderPosition());
	360	}
	361
	362	void View::update_viewport()
	363	{
	364	assert(_viewport);
	365	_viewport->update();
	366	}
	367
	368	void View::get_scroll_layout(double &length, double &offset) const
	369	{
	370	const pair<double, double> extents = get_time_extents();
	371	length = (extents.second - extents.first) / _scale;
	372	offset = _offset / _scale;
	373	}
	374
	375	void View::set_zoom(double scale, int offset)
	376	{
	377	const double cursor_offset = _offset + _scale * offset;
	378	const double new_scale = max(min(scale, MaxScale), MinScale);
	379	const double new_offset = cursor_offset - new_scale * offset;
	380	set_scale_offset(new_scale, new_offset);
	381	}
	382
	383	void View::update_scroll()
	384	{
	385	assert(_viewport);
	386
	387	const QSize areaSize = _viewport->size();
	388
	389	// Set the horizontal scroll bar
	390	double length = 0, offset = 0;
	391	get_scroll_layout(length, offset);
	392	length = max(length - areaSize.width(), 0.0);
	393
	394	horizontalScrollBar()->setPageStep(areaSize.width() / 2);
	395
	396	_updating_scroll = true;
	397
	398	if (length < MaxScrollValue) {
	399	horizontalScrollBar()->setRange(0, length);
	400	horizontalScrollBar()->setSliderPosition(offset);
	401	} else {
	402	horizontalScrollBar()->setRange(0, MaxScrollValue);
	403	horizontalScrollBar()->setSliderPosition(
	404	_offset * MaxScrollValue / (_scale * length));
	405	}
	406
	407	_updating_scroll = false;
	408
	409	// Set the vertical scrollbar
	410	verticalScrollBar()->setPageStep(areaSize.height());
	411	verticalScrollBar()->setRange(0,
	412	_viewport->get_total_height() + SignalMargin -
	413	areaSize.height());
	414	}
	415
	416	void View::update_layout()
	417	{
	418	setViewportMargins(
	419	_header->sizeHint().width() - pv::view::Header::BaselineOffset,
	420	_ruler->sizeHint().height(), 0, 0);
	421	_ruler->setGeometry(_viewport->x(), 0,
	422	_viewport->width(), _viewport->y());
	423	_cursorheader->setGeometry(
	424	_viewport->x(),
	425	_ruler->sizeHint().height() - _cursorheader->sizeHint().height() / 2,
	426	_viewport->width(), _cursorheader->sizeHint().height());
	427	_header->setGeometry(0, _viewport->y(),
	428	_header->sizeHint().width(), _viewport->height());
	429	update_scroll();
	430	}
	431
	432	void View::paint_label(QPainter &p, int right, bool hover)
	433	{
	434	(void)p;
	435	(void)right;
	436	(void)hover;
	437	}
	438
	439	QRectF View::label_rect(int right)
	440	{
	441	(void)right;
	442	return QRectF();
	443	}
	444
	445	bool View::eventFilter(QObject object, QEvent event)
	446	{
	447	const QEvent::Type type = event->type();
	448	if (type == QEvent::MouseMove) {
	449
	450	const QMouseEvent const mouse_event = (QMouseEvent)event;
	451	if (object == _viewport)
	452	_hover_point = mouse_event->pos();
	453	else if (object == _ruler \|\| object == _cursorheader)
	454	_hover_point = QPoint(mouse_event->x(), 0);
	455	else if (object == _header)
	456	_hover_point = QPoint(0, mouse_event->y());
	457	else
	458	_hover_point = QPoint(-1, -1);
	459
	460	hover_point_changed();
	461
	462	} else if (type == QEvent::Leave) {
	463	_hover_point = QPoint(-1, -1);
	464	hover_point_changed();
	465	}
	466
	467	return QObject::eventFilter(object, event);
	468	}
	469
	470	bool View::viewportEvent(QEvent *e)
	471	{
	472	switch(e->type()) {
	473	case QEvent::Paint:
	474	case QEvent::MouseButtonPress:
	475	case QEvent::MouseButtonRelease:
	476	case QEvent::MouseButtonDblClick:
	477	case QEvent::MouseMove:
	478	case QEvent::Wheel:
	479	case QEvent::TouchBegin:
	480	case QEvent::TouchUpdate:
	481	case QEvent::TouchEnd:
	482	return false;
	483
	484	default:
	485	return QAbstractScrollArea::viewportEvent(e);
	486	}
	487	}
	488
	489	void View::resizeEvent(QResizeEvent*)
	490	{
	491	update_layout();
	492	}
	493
	494	void View::h_scroll_value_changed(int value)
	495	{
	496	if (_updating_scroll)
	497	return;
	498
	499	const int range = horizontalScrollBar()->maximum();
	500	if (range < MaxScrollValue)
	501	_offset = _scale * value;
	502	else {
	503	double length = 0, offset;
	504	get_scroll_layout(length, offset);
	505	_offset = _scale * length * value / MaxScrollValue;
	506	}
	507
	508	_ruler->update();
	509	_cursorheader->update();
	510	_viewport->update();
	511	}
	512
	513	void View::v_scroll_value_changed(int value)
	514	{
	515	_v_offset = value;
	516	_header->update();
	517	_viewport->update();
	518	}
	519
	520	void View::signals_changed()
	521	{
	522	// Populate the traces
	523	clear_child_items();
	524
	525	const vector< shared_ptr<Signal> > sigs(
	526	session().get_signals());
	527	for (auto s : sigs)
	528	add_child_item(s);
	529
	530	#ifdef ENABLE_DECODE
	531	const vector< shared_ptr<DecodeTrace> > decode_sigs(
	532	session().get_decode_signals());
	533	for (auto s : decode_sigs)
	534	add_child_item(s);
	535	#endif
	536
	537	// Create the initial layout
	538	int offset = SignalMargin + SignalHeight;
	539	for (shared_ptr<RowItem> r : child_items()) {
	540	r->set_v_offset(offset);
	541	offset += SignalHeight + 2 * SignalMargin;
	542	}
	543
	544	update_layout();
	545	normalize_layout();
	546	}
	547
	548	void View::data_updated()
	549	{
	550	// Update the scroll bars
	551	update_scroll();
	552
	553	// Repaint the view
	554	_viewport->update();
	555	}
	556
	557	void View::marker_time_changed()
	558	{
	559	_cursorheader->update();
	560	_viewport->update();
	561	}
	562
	563	void View::on_signals_moved()
	564	{
	565	update_scroll();
	566	signals_moved();
	567	}
	568
	569	void View::on_geometry_updated()
	570	{
	571	update_layout();
	572	}
	573
	574	void View::on_hover_point_changed()
	575	{
	576	const vector< shared_ptr<RowItem> > row_items(child_items());
	577	for (shared_ptr<RowItem> r : row_items)
	578	r->hover_point_changed();
	579	}
	580
	581	} // namespace view
	582	} // namespace pv