[pulseview.git] / pv / subwindows / decoder_selector / subwindow.cpp

/*
 * This file is part of the PulseView project.
 *
 * Copyright (C) 2018 Soeren Apel <soeren@apelpie.net>
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include <algorithm>

#include <QApplication>
#include <QDebug>
#include <QFontMetrics>
#include <QInputDialog>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QScrollArea>
#include <QVBoxLayout>

#include "pv/session.hpp"
#include "pv/subwindows/decoder_selector/subwindow.hpp"

using std::reverse;

namespace pv {
namespace subwindows {
namespace decoder_selector {

const char *initial_notice =
	QT_TRANSLATE_NOOP("pv::subwindows::decoder_selector::SubWindow", "Select a decoder to see its description here.");

const int min_width_margin = 75;


bool QCustomSortFilterProxyModel::filterAcceptsRow(int source_row,
	const QModelIndex& source_parent) const
{
	// Search model recursively

	if (QSortFilterProxyModel::filterAcceptsRow(source_row, source_parent))
		return true;

	const QModelIndex index = sourceModel()->index(source_row, 0, source_parent);

	for (int i = 0; i < sourceModel()->rowCount(index); i++)
		if (filterAcceptsRow(i, index))
			return true;

	return false;
}


void QCustomTreeView::currentChanged(const QModelIndex& current,
	const QModelIndex& previous)
{
	QTreeView::currentChanged(current, previous);
	currentChanged(current);
}


SubWindow::SubWindow(Session& session, QWidget* parent) :
	SubWindowBase(session, parent),
	splitter_(new QSplitter()),
	tree_view_(new QCustomTreeView()),
	info_box_(new QWidget()),
	info_label_header_(new QLabel()),
	info_label_body_(new QLabel()),
	info_label_footer_(new QLabel()),
	model_(new DecoderCollectionModel()),
	sort_filter_model_(new QCustomSortFilterProxyModel())
{
	QVBoxLayout* root_layout = new QVBoxLayout(this);
	root_layout->setContentsMargins(0, 0, 0, 0);
	root_layout->addWidget(splitter_);

	QWidget* upper_container = new QWidget();
	QVBoxLayout* upper_layout = new QVBoxLayout(upper_container);
	upper_layout->setContentsMargins(0, 5, 0, 0);
	QLineEdit* filter = new QLineEdit();
	upper_layout->addWidget(filter);
	upper_layout->addWidget(tree_view_);

	splitter_->setOrientation(Qt::Vertical);
	splitter_->addWidget(upper_container);
	splitter_->addWidget(info_box_);

	const QIcon filter_icon(QIcon::fromTheme("search",
		QIcon(":/icons/search.svg")));
	filter->setClearButtonEnabled(true);
	filter->addAction(filter_icon, QLineEdit::LeadingPosition);

	sort_filter_model_->setSourceModel(model_);
	sort_filter_model_->setFilterCaseSensitivity(Qt::CaseInsensitive);
	sort_filter_model_->setFilterKeyColumn(-1);

	tree_view_->setModel(sort_filter_model_);
	tree_view_->setRootIsDecorated(true);
	tree_view_->setSortingEnabled(true);
	tree_view_->sortByColumn(0, Qt::AscendingOrder);

	// Hide the columns that hold the detailed item information
	tree_view_->hideColumn(2);  // ID

	// Ensure that all decoder tag names are fully visible by default
	tree_view_->resizeColumnToContents(0);

	tree_view_->setIndentation(10);

	QScrollArea* info_label_body_container = new QScrollArea();
	info_label_body_container->setWidget(info_label_body_);
	info_label_body_container->setWidgetResizable(true);

	info_box_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
	QVBoxLayout* info_box_layout = new QVBoxLayout(info_box_);
	info_box_layout->addWidget(info_label_header_);
	info_box_layout->addWidget(info_label_body_container);
	info_box_layout->addWidget(info_label_footer_);
	info_box_layout->setAlignment(Qt::AlignTop);
	Qt::TextInteractionFlags flags = Qt::TextSelectableByMouse | Qt::TextSelectableByKeyboard;
	info_label_header_->setWordWrap(true);
	info_label_header_->setTextInteractionFlags(flags);
	info_label_body_->setWordWrap(true);
	info_label_body_->setTextInteractionFlags(flags);
	info_label_body_->setText(QString(tr(initial_notice)));
	info_label_body_->setAlignment(Qt::AlignTop);
	info_label_footer_->setWordWrap(true);
	info_label_footer_->setTextInteractionFlags(flags);

	connect(filter, SIGNAL(textChanged(const QString&)),
		this, SLOT(on_filter_changed(const QString&)));
	connect(filter, SIGNAL(returnPressed()),
		this, SLOT(on_filter_return_pressed()));

	connect(tree_view_, SIGNAL(currentChanged(const QModelIndex&)),
		this, SLOT(on_item_changed(const QModelIndex&)));
	connect(tree_view_, SIGNAL(activated(const QModelIndex&)),
		this, SLOT(on_item_activated(const QModelIndex&)));

	connect(this, SIGNAL(new_decoders_selected(vector<const srd_decoder*>)),
		&session, SLOT(on_new_decoders_selected(vector<const srd_decoder*>)));

	// Place the keyboard cursor in the filter QLineEdit initially
	filter->setFocus();
}

bool SubWindow::has_toolbar() const
{
	return true;
}

QToolBar* SubWindow::create_toolbar(QWidget *parent) const
{
	QToolBar* toolbar = new QToolBar(parent);

	return toolbar;
}

int SubWindow::minimum_width() const
{
	QFontMetrics m(info_label_body_->font());
	const int label_width = m.width(QString(tr(initial_notice)));

	return label_width + min_width_margin;
}

vector<const char*> SubWindow::get_decoder_inputs(const srd_decoder* d) const
{
	vector<const char*> ret_val;

	for (GSList* li = d->inputs; li; li = li->next)
		ret_val.push_back((const char*)li->data);

	return ret_val;
}

vector<const srd_decoder*> SubWindow::get_decoders_providing(const char* output) const
{
	vector<const srd_decoder*> ret_val;

	for (GSList* li = (GSList*)srd_decoder_list(); li; li = li->next) {
		const srd_decoder* d = (srd_decoder*)li->data;
		assert(d);

		if (!d->outputs)
			continue;

		const int maxlen = 1024;

		// TODO For now we ignore that d->outputs is actually a list
		if (strncmp((char*)(d->outputs->data), output, maxlen) == 0)
			ret_val.push_back(d);
	}

	return ret_val;
}

void SubWindow::on_item_changed(const QModelIndex& index)
{
	if (!index.isValid())
		return;

	QModelIndex id_index = index.model()->index(index.row(), 2, index.parent());
	QString decoder_name = index.model()->data(id_index, Qt::DisplayRole).toString();

	if (decoder_name.isEmpty())
		return;

	const srd_decoder* d = srd_decoder_get_by_id(decoder_name.toUtf8());

	const QString id = QString::fromUtf8(d->id);
	const QString longname = QString::fromUtf8(d->longname);
	const QString desc = QString::fromUtf8(d->desc);
	const QString doc = QString::fromUtf8(srd_decoder_doc_get(d)).trimmed();

	QString tags;
	for (GSList* li = (GSList*)d->tags; li; li = li->next) {
		QString s = (li == (GSList*)d->tags) ?
			tr((char*)li->data) :
			QString(tr(", %1")).arg(tr((char*)li->data));
		tags.append(s);
	}

	info_label_header_->setText(QString("<span style='font-size:large'><b>%1 (%2)</b></span><br><i>%3</i>")
		.arg(longname, id, desc));
	info_label_body_->setText(doc);
	info_label_footer_->setText(tr("<p align='right'>Tags: %1</p>").arg(tags));
}

void SubWindow::on_item_activated(const QModelIndex& index)
{
	if (!index.isValid())
		return;

	QModelIndex id_index = index.model()->index(index.row(), 2, index.parent());
	QString decoder_name = index.model()->data(id_index, Qt::DisplayRole).toString();

	const srd_decoder* chosen_decoder = srd_decoder_get_by_id(decoder_name.toUtf8());
	if (chosen_decoder == nullptr)
		return;

	vector<const srd_decoder*> decoders;
	decoders.push_back(chosen_decoder);

	// If the decoder only depends on logic inputs, we add it and are done
	vector<const char*> inputs = get_decoder_inputs(decoders.front());
	if (inputs.size() == 0) {
		qWarning() << "Protocol decoder" << decoder_name << "cannot have 0 inputs!";
		return;
	}

	if (strcmp(inputs.at(0), "logic") == 0) {
		new_decoders_selected(decoders);
		return;
	}

	// Check if we can automatically fulfill the stacking requirements
	while (strcmp(inputs.at(0), "logic") != 0) {
		vector<const srd_decoder*> prov_decoders = get_decoders_providing(inputs.at(0));

		if (prov_decoders.size() == 0) {
			// Emit warning and add the stack that we could gather so far
			qWarning() << "Protocol decoder" << QString::fromUtf8(decoders.back()->id) \
				<< "has input that no other decoder provides:" << QString::fromUtf8(inputs.at(0));
			break;
		}

		if (prov_decoders.size() == 1) {
			decoders.push_back(prov_decoders.front());
		} else {
			// Let user decide which one to use
			QString caption = QString(tr("Protocol decoder <b>%1</b> requires input type <b>%2</b> " \
				"which several decoders provide.<br>Choose which one to use:<br>"))
					.arg(QString::fromUtf8(decoders.back()->id), QString::fromUtf8(inputs.at(0)));

			QStringList items;
			for (const srd_decoder* d : prov_decoders)
				items << QString::fromUtf8(d->id) + " (" + QString::fromUtf8(d->longname) + ")";
			bool ok_clicked;
			QString item = QInputDialog::getItem(this, tr("Choose Decoder"),
				tr(caption.toUtf8()), items, 0, false, &ok_clicked);

			if ((!ok_clicked) || (item.isEmpty()))
				return;

			QString d = item.section(' ', 0, 0);
			decoders.push_back(srd_decoder_get_by_id(d.toUtf8()));
		}

		inputs = get_decoder_inputs(decoders.back());
	}

	// Reverse decoder list and add the stack
	reverse(decoders.begin(), decoders.end());
	new_decoders_selected(decoders);
}

void SubWindow::on_filter_changed(const QString& text)
{
	sort_filter_model_->setFilterFixedString(text);

	// Expand the "All Decoders" category/tag if the user filtered
	tree_view_->setExpanded(tree_view_->model()->index(0, 0), !text.isEmpty());
}

void SubWindow::on_filter_return_pressed()
{
	int num_visible_decoders = 0;
	QModelIndex last_valid_index;

	QModelIndex index = tree_view_->model()->index(0, 0);

	while (index.isValid()) {
		QModelIndex id_index = index.model()->index(index.row(), 2, index.parent());
		QString decoder_name = index.model()->data(id_index, Qt::DisplayRole).toString();
		if (!decoder_name.isEmpty()) {
			last_valid_index = index;
			num_visible_decoders++;
		}
		index = tree_view_->indexBelow(index);
	}

	// If only one decoder matches the filter, apply it when the user presses enter
	if (num_visible_decoders == 1)
		tree_view_->activated(last_valid_index);
}

} // namespace decoder_selector
} // namespace subwindows
} // namespace pv
Commit	Line	Data
	1	/*
	2	* This file is part of the PulseView project.
	3	*
	4	* Copyright (C) 2018 Soeren Apel <soeren@apelpie.net>
	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, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <algorithm>
	21
	22	#include <QApplication>
	23	#include <QDebug>
	24	#include <QFontMetrics>
	25	#include <QInputDialog>
	26	#include <QLabel>
	27	#include <QLineEdit>
	28	#include <QPushButton>
	29	#include <QScrollArea>
	30	#include <QVBoxLayout>
	31
	32	#include "pv/session.hpp"
	33	#include "pv/subwindows/decoder_selector/subwindow.hpp"
	34
	35	using std::reverse;
	36
	37	namespace pv {
	38	namespace subwindows {
	39	namespace decoder_selector {
	40
	41	const char *initial_notice =
	42	QT_TRANSLATE_NOOP("pv::subwindows::decoder_selector::SubWindow", "Select a decoder to see its description here.");
	43
	44	const int min_width_margin = 75;
	45
	46
	47	bool QCustomSortFilterProxyModel::filterAcceptsRow(int source_row,
	48	const QModelIndex& source_parent) const
	49	{
	50	// Search model recursively
	51
	52	if (QSortFilterProxyModel::filterAcceptsRow(source_row, source_parent))
	53	return true;
	54
	55	const QModelIndex index = sourceModel()->index(source_row, 0, source_parent);
	56
	57	for (int i = 0; i < sourceModel()->rowCount(index); i++)
	58	if (filterAcceptsRow(i, index))
	59	return true;
	60
	61	return false;
	62	}
	63
	64
	65	void QCustomTreeView::currentChanged(const QModelIndex& current,
	66	const QModelIndex& previous)
	67	{
	68	QTreeView::currentChanged(current, previous);
	69	currentChanged(current);
	70	}
	71
	72
	73	SubWindow::SubWindow(Session& session, QWidget* parent) :
	74	SubWindowBase(session, parent),
	75	splitter_(new QSplitter()),
	76	tree_view_(new QCustomTreeView()),
	77	info_box_(new QWidget()),
	78	info_label_header_(new QLabel()),
	79	info_label_body_(new QLabel()),
	80	info_label_footer_(new QLabel()),
	81	model_(new DecoderCollectionModel()),
	82	sort_filter_model_(new QCustomSortFilterProxyModel())
	83	{
	84	QVBoxLayout* root_layout = new QVBoxLayout(this);
	85	root_layout->setContentsMargins(0, 0, 0, 0);
	86	root_layout->addWidget(splitter_);
	87
	88	QWidget* upper_container = new QWidget();
	89	QVBoxLayout* upper_layout = new QVBoxLayout(upper_container);
	90	upper_layout->setContentsMargins(0, 5, 0, 0);
	91	QLineEdit* filter = new QLineEdit();
	92	upper_layout->addWidget(filter);
	93	upper_layout->addWidget(tree_view_);
	94
	95	splitter_->setOrientation(Qt::Vertical);
	96	splitter_->addWidget(upper_container);
	97	splitter_->addWidget(info_box_);
	98
	99	const QIcon filter_icon(QIcon::fromTheme("search",
	100	QIcon(":/icons/search.svg")));
	101	filter->setClearButtonEnabled(true);
	102	filter->addAction(filter_icon, QLineEdit::LeadingPosition);
	103
	104	sort_filter_model_->setSourceModel(model_);
	105	sort_filter_model_->setFilterCaseSensitivity(Qt::CaseInsensitive);
	106	sort_filter_model_->setFilterKeyColumn(-1);
	107
	108	tree_view_->setModel(sort_filter_model_);
	109	tree_view_->setRootIsDecorated(true);
	110	tree_view_->setSortingEnabled(true);
	111	tree_view_->sortByColumn(0, Qt::AscendingOrder);
	112
	113	// Hide the columns that hold the detailed item information
	114	tree_view_->hideColumn(2); // ID
	115
	116	// Ensure that all decoder tag names are fully visible by default
	117	tree_view_->resizeColumnToContents(0);
	118
	119	tree_view_->setIndentation(10);
	120
	121	QScrollArea* info_label_body_container = new QScrollArea();
	122	info_label_body_container->setWidget(info_label_body_);
	123	info_label_body_container->setWidgetResizable(true);
	124
	125	info_box_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
	126	QVBoxLayout* info_box_layout = new QVBoxLayout(info_box_);
	127	info_box_layout->addWidget(info_label_header_);
	128	info_box_layout->addWidget(info_label_body_container);
	129	info_box_layout->addWidget(info_label_footer_);
	130	info_box_layout->setAlignment(Qt::AlignTop);
	131	Qt::TextInteractionFlags flags = Qt::TextSelectableByMouse \| Qt::TextSelectableByKeyboard;
	132	info_label_header_->setWordWrap(true);
	133	info_label_header_->setTextInteractionFlags(flags);
	134	info_label_body_->setWordWrap(true);
	135	info_label_body_->setTextInteractionFlags(flags);
	136	info_label_body_->setText(QString(tr(initial_notice)));
	137	info_label_body_->setAlignment(Qt::AlignTop);
	138	info_label_footer_->setWordWrap(true);
	139	info_label_footer_->setTextInteractionFlags(flags);
	140
	141	connect(filter, SIGNAL(textChanged(const QString&)),
	142	this, SLOT(on_filter_changed(const QString&)));
	143	connect(filter, SIGNAL(returnPressed()),
	144	this, SLOT(on_filter_return_pressed()));
	145
	146	connect(tree_view_, SIGNAL(currentChanged(const QModelIndex&)),
	147	this, SLOT(on_item_changed(const QModelIndex&)));
	148	connect(tree_view_, SIGNAL(activated(const QModelIndex&)),
	149	this, SLOT(on_item_activated(const QModelIndex&)));
	150
	151	connect(this, SIGNAL(new_decoders_selected(vector<const srd_decoder*>)),
	152	&session, SLOT(on_new_decoders_selected(vector<const srd_decoder*>)));
	153
	154	// Place the keyboard cursor in the filter QLineEdit initially
	155	filter->setFocus();
	156	}
	157
	158	bool SubWindow::has_toolbar() const
	159	{
	160	return true;
	161	}
	162
	163	QToolBar* SubWindow::create_toolbar(QWidget *parent) const
	164	{
	165	QToolBar* toolbar = new QToolBar(parent);
	166
	167	return toolbar;
	168	}
	169
	170	int SubWindow::minimum_width() const
	171	{
	172	QFontMetrics m(info_label_body_->font());
	173	const int label_width = m.width(QString(tr(initial_notice)));
	174
	175	return label_width + min_width_margin;
	176	}
	177
	178	vector<const char> SubWindow::get_decoder_inputs(const srd_decoder d) const
	179	{
	180	vector<const char*> ret_val;
	181
	182	for (GSList* li = d->inputs; li; li = li->next)
	183	ret_val.push_back((const char*)li->data);
	184
	185	return ret_val;
	186	}
	187
	188	vector<const srd_decoder> SubWindow::get_decoders_providing(const char output) const
	189	{
	190	vector<const srd_decoder*> ret_val;
	191
	192	for (GSList* li = (GSList*)srd_decoder_list(); li; li = li->next) {
	193	const srd_decoder* d = (srd_decoder*)li->data;
	194	assert(d);
	195
	196	if (!d->outputs)
	197	continue;
	198
	199	const int maxlen = 1024;
	200
	201	// TODO For now we ignore that d->outputs is actually a list
	202	if (strncmp((char*)(d->outputs->data), output, maxlen) == 0)
	203	ret_val.push_back(d);
	204	}
	205
	206	return ret_val;
	207	}
	208
	209	void SubWindow::on_item_changed(const QModelIndex& index)
	210	{
	211	if (!index.isValid())
	212	return;
	213
	214	QModelIndex id_index = index.model()->index(index.row(), 2, index.parent());
	215	QString decoder_name = index.model()->data(id_index, Qt::DisplayRole).toString();
	216
	217	if (decoder_name.isEmpty())
	218	return;
	219
	220	const srd_decoder* d = srd_decoder_get_by_id(decoder_name.toUtf8());
	221
	222	const QString id = QString::fromUtf8(d->id);
	223	const QString longname = QString::fromUtf8(d->longname);
	224	const QString desc = QString::fromUtf8(d->desc);
	225	const QString doc = QString::fromUtf8(srd_decoder_doc_get(d)).trimmed();
	226
	227	QString tags;
	228	for (GSList* li = (GSList*)d->tags; li; li = li->next) {
	229	QString s = (li == (GSList*)d->tags) ?
	230	tr((char*)li->data) :
	231	QString(tr(", %1")).arg(tr((char*)li->data));
	232	tags.append(s);
	233	}
	234
	235	info_label_header_->setText(QString("<span style='font-size:large'><b>%1 (%2)</b></span><br><i>%3</i>")
	236	.arg(longname, id, desc));
	237	info_label_body_->setText(doc);
	238	info_label_footer_->setText(tr("<p align='right'>Tags: %1</p>").arg(tags));
	239	}
	240
	241	void SubWindow::on_item_activated(const QModelIndex& index)
	242	{
	243	if (!index.isValid())
	244	return;
	245
	246	QModelIndex id_index = index.model()->index(index.row(), 2, index.parent());
	247	QString decoder_name = index.model()->data(id_index, Qt::DisplayRole).toString();
	248
	249	const srd_decoder* chosen_decoder = srd_decoder_get_by_id(decoder_name.toUtf8());
	250	if (chosen_decoder == nullptr)
	251	return;
	252
	253	vector<const srd_decoder*> decoders;
	254	decoders.push_back(chosen_decoder);
	255
	256	// If the decoder only depends on logic inputs, we add it and are done
	257	vector<const char*> inputs = get_decoder_inputs(decoders.front());
	258	if (inputs.size() == 0) {
	259	qWarning() << "Protocol decoder" << decoder_name << "cannot have 0 inputs!";
	260	return;
	261	}
	262
	263	if (strcmp(inputs.at(0), "logic") == 0) {
	264	new_decoders_selected(decoders);
	265	return;
	266	}
	267
	268	// Check if we can automatically fulfill the stacking requirements
	269	while (strcmp(inputs.at(0), "logic") != 0) {
	270	vector<const srd_decoder*> prov_decoders = get_decoders_providing(inputs.at(0));
	271
	272	if (prov_decoders.size() == 0) {
	273	// Emit warning and add the stack that we could gather so far
	274	qWarning() << "Protocol decoder" << QString::fromUtf8(decoders.back()->id) \
	275	<< "has input that no other decoder provides:" << QString::fromUtf8(inputs.at(0));
	276	break;
	277	}
	278
	279	if (prov_decoders.size() == 1) {
	280	decoders.push_back(prov_decoders.front());
	281	} else {
	282	// Let user decide which one to use
	283	QString caption = QString(tr("Protocol decoder <b>%1</b> requires input type <b>%2</b> " \
	284	"which several decoders provide.<br>Choose which one to use:<br>"))
	285	.arg(QString::fromUtf8(decoders.back()->id), QString::fromUtf8(inputs.at(0)));
	286
	287	QStringList items;
	288	for (const srd_decoder* d : prov_decoders)
	289	items << QString::fromUtf8(d->id) + " (" + QString::fromUtf8(d->longname) + ")";
	290	bool ok_clicked;
	291	QString item = QInputDialog::getItem(this, tr("Choose Decoder"),
	292	tr(caption.toUtf8()), items, 0, false, &ok_clicked);
	293
	294	if ((!ok_clicked) \|\| (item.isEmpty()))
	295	return;
	296
	297	QString d = item.section(' ', 0, 0);
	298	decoders.push_back(srd_decoder_get_by_id(d.toUtf8()));
	299	}
	300
	301	inputs = get_decoder_inputs(decoders.back());
	302	}
	303
	304	// Reverse decoder list and add the stack
	305	reverse(decoders.begin(), decoders.end());
	306	new_decoders_selected(decoders);
	307	}
	308
	309	void SubWindow::on_filter_changed(const QString& text)
	310	{
	311	sort_filter_model_->setFilterFixedString(text);
	312
	313	// Expand the "All Decoders" category/tag if the user filtered
	314	tree_view_->setExpanded(tree_view_->model()->index(0, 0), !text.isEmpty());
	315	}
	316
	317	void SubWindow::on_filter_return_pressed()
	318	{
	319	int num_visible_decoders = 0;
	320	QModelIndex last_valid_index;
	321
	322	QModelIndex index = tree_view_->model()->index(0, 0);
	323
	324	while (index.isValid()) {
	325	QModelIndex id_index = index.model()->index(index.row(), 2, index.parent());
	326	QString decoder_name = index.model()->data(id_index, Qt::DisplayRole).toString();
	327	if (!decoder_name.isEmpty()) {
	328	last_valid_index = index;
	329	num_visible_decoders++;
	330	}
	331	index = tree_view_->indexBelow(index);
	332	}
	333
	334	// If only one decoder matches the filter, apply it when the user presses enter
	335	if (num_visible_decoders == 1)
	336	tree_view_->activated(last_valid_index);
	337	}
	338
	339	} // namespace decoder_selector
	340	} // namespace subwindows
	341	} // namespace pv