[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"

#include <libsigrokdecode/libsigrokdecode.h>
#include "subwindow.hpp"  // Required only for lupdate since above include isn't recognized

#define DECODERS_HAVE_TAGS \
	((SRD_PACKAGE_VERSION_MAJOR > 0) || \
	 (SRD_PACKAGE_VERSION_MAJOR == 0) && (SRD_PACKAGE_VERSION_MINOR > 5))

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.");  // clazy:exclude=non-pod-global-static

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);

	current_changed(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_->setSortCaseSensitivity(Qt::CaseInsensitive);
	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);

#if (!DECODERS_HAVE_TAGS)
	tree_view_->expandAll();
	tree_view_->setItemsExpandable(false);
#endif

	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(current_changed(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 = util::text_width(m, 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)
{
	QString decoder_name, id, longname, desc, doc, tags;

	// If the parent isn't valid, a category title was clicked
	if (index.isValid() && index.parent().isValid()) {
		QModelIndex id_index = index.model()->index(index.row(), 2, index.parent());
		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());

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

#if DECODERS_HAVE_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);
		}
#endif
	} else
		doc = QString(tr(initial_notice));

	if (!id.isEmpty())
		info_label_header_->setText(
			QString("<span style='font-size:large'><b>%1 (%2)</b></span><br><i>%3</i>")
			.arg(longname, id, desc));
	else
		info_label_header_->clear();

	info_label_body_->setText(doc);

	if (!tags.isEmpty())
		info_label_footer_->setText(tr("<p align='right'>Tags: %1</p>").arg(tags));
	else
		info_label_footer_->clear();
}

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	#include <libsigrokdecode/libsigrokdecode.h>
	36	#include "subwindow.hpp" // Required only for lupdate since above include isn't recognized
	37
	38	#define DECODERS_HAVE_TAGS \
	39	((SRD_PACKAGE_VERSION_MAJOR > 0) \|\| \
	40	(SRD_PACKAGE_VERSION_MAJOR == 0) && (SRD_PACKAGE_VERSION_MINOR > 5))
	41
	42	using std::reverse;
	43
	44	namespace pv {
	45	namespace subwindows {
	46	namespace decoder_selector {
	47
	48	const char *initial_notice =
	49	QT_TRANSLATE_NOOP("pv::subwindows::decoder_selector::SubWindow",
	50	"Select a decoder to see its description here."); // clazy:exclude=non-pod-global-static
	51
	52	const int min_width_margin = 75;
	53
	54
	55	bool QCustomSortFilterProxyModel::filterAcceptsRow(int source_row,
	56	const QModelIndex& source_parent) const
	57	{
	58	// Search model recursively
	59
	60	if (QSortFilterProxyModel::filterAcceptsRow(source_row, source_parent))
	61	return true;
	62
	63	const QModelIndex index = sourceModel()->index(source_row, 0, source_parent);
	64
	65	for (int i = 0; i < sourceModel()->rowCount(index); i++)
	66	if (filterAcceptsRow(i, index))
	67	return true;
	68
	69	return false;
	70	}
	71
	72
	73	void QCustomTreeView::currentChanged(const QModelIndex& current,
	74	const QModelIndex& previous)
	75	{
	76	QTreeView::currentChanged(current, previous);
	77
	78	current_changed(current);
	79	}
	80
	81
	82	SubWindow::SubWindow(Session& session, QWidget* parent) :
	83	SubWindowBase(session, parent),
	84	splitter_(new QSplitter()),
	85	tree_view_(new QCustomTreeView()),
	86	info_box_(new QWidget()),
	87	info_label_header_(new QLabel()),
	88	info_label_body_(new QLabel()),
	89	info_label_footer_(new QLabel()),
	90	model_(new DecoderCollectionModel()),
	91	sort_filter_model_(new QCustomSortFilterProxyModel())
	92	{
	93	QVBoxLayout* root_layout = new QVBoxLayout(this);
	94	root_layout->setContentsMargins(0, 0, 0, 0);
	95	root_layout->addWidget(splitter_);
	96
	97	QWidget* upper_container = new QWidget();
	98	QVBoxLayout* upper_layout = new QVBoxLayout(upper_container);
	99	upper_layout->setContentsMargins(0, 5, 0, 0);
	100	QLineEdit* filter = new QLineEdit();
	101	upper_layout->addWidget(filter);
	102	upper_layout->addWidget(tree_view_);
	103
	104	splitter_->setOrientation(Qt::Vertical);
	105	splitter_->addWidget(upper_container);
	106	splitter_->addWidget(info_box_);
	107
	108	const QIcon filter_icon(QIcon::fromTheme("search",
	109	QIcon(":/icons/search.svg")));
	110	filter->setClearButtonEnabled(true);
	111	filter->addAction(filter_icon, QLineEdit::LeadingPosition);
	112
	113
	114	sort_filter_model_->setSourceModel(model_);
	115	sort_filter_model_->setSortCaseSensitivity(Qt::CaseInsensitive);
	116	sort_filter_model_->setFilterCaseSensitivity(Qt::CaseInsensitive);
	117	sort_filter_model_->setFilterKeyColumn(-1);
	118
	119	tree_view_->setModel(sort_filter_model_);
	120	tree_view_->setRootIsDecorated(true);
	121	tree_view_->setSortingEnabled(true);
	122	tree_view_->sortByColumn(0, Qt::AscendingOrder);
	123
	124	// Hide the columns that hold the detailed item information
	125	tree_view_->hideColumn(2); // ID
	126
	127	// Ensure that all decoder tag names are fully visible by default
	128	tree_view_->resizeColumnToContents(0);
	129
	130	tree_view_->setIndentation(10);
	131
	132	#if (!DECODERS_HAVE_TAGS)
	133	tree_view_->expandAll();
	134	tree_view_->setItemsExpandable(false);
	135	#endif
	136
	137	QScrollArea* info_label_body_container = new QScrollArea();
	138	info_label_body_container->setWidget(info_label_body_);
	139	info_label_body_container->setWidgetResizable(true);
	140
	141	info_box_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
	142	QVBoxLayout* info_box_layout = new QVBoxLayout(info_box_);
	143	info_box_layout->addWidget(info_label_header_);
	144	info_box_layout->addWidget(info_label_body_container);
	145	info_box_layout->addWidget(info_label_footer_);
	146	info_box_layout->setAlignment(Qt::AlignTop);
	147	Qt::TextInteractionFlags flags = Qt::TextSelectableByMouse \| Qt::TextSelectableByKeyboard;
	148	info_label_header_->setWordWrap(true);
	149	info_label_header_->setTextInteractionFlags(flags);
	150	info_label_body_->setWordWrap(true);
	151	info_label_body_->setTextInteractionFlags(flags);
	152	info_label_body_->setText(QString(tr(initial_notice)));
	153	info_label_body_->setAlignment(Qt::AlignTop);
	154	info_label_footer_->setWordWrap(true);
	155	info_label_footer_->setTextInteractionFlags(flags);
	156
	157	connect(filter, SIGNAL(textChanged(const QString&)),
	158	this, SLOT(on_filter_changed(const QString&)));
	159	connect(filter, SIGNAL(returnPressed()),
	160	this, SLOT(on_filter_return_pressed()));
	161
	162	connect(tree_view_, SIGNAL(current_changed(const QModelIndex&)),
	163	this, SLOT(on_item_changed(const QModelIndex&)));
	164	connect(tree_view_, SIGNAL(activated(const QModelIndex&)),
	165	this, SLOT(on_item_activated(const QModelIndex&)));
	166
	167	connect(this, SIGNAL(new_decoders_selected(vector<const srd_decoder*>)),
	168	&session, SLOT(on_new_decoders_selected(vector<const srd_decoder*>)));
	169
	170	// Place the keyboard cursor in the filter QLineEdit initially
	171	filter->setFocus();
	172	}
	173
	174	bool SubWindow::has_toolbar() const
	175	{
	176	return true;
	177	}
	178
	179	QToolBar* SubWindow::create_toolbar(QWidget *parent) const
	180	{
	181	QToolBar* toolbar = new QToolBar(parent);
	182
	183	return toolbar;
	184	}
	185
	186	int SubWindow::minimum_width() const
	187	{
	188	QFontMetrics m(info_label_body_->font());
	189	const int label_width = util::text_width(m, tr(initial_notice));
	190
	191	return label_width + min_width_margin;
	192	}
	193
	194	vector<const char> SubWindow::get_decoder_inputs(const srd_decoder d) const
	195	{
	196	vector<const char*> ret_val;
	197
	198	for (GSList* li = d->inputs; li; li = li->next)
	199	ret_val.push_back((const char*)li->data);
	200
	201	return ret_val;
	202	}
	203
	204	vector<const srd_decoder> SubWindow::get_decoders_providing(const char output) const
	205	{
	206	vector<const srd_decoder*> ret_val;
	207
	208	for (GSList* li = (GSList*)srd_decoder_list(); li; li = li->next) {
	209	const srd_decoder* d = (srd_decoder*)li->data;
	210	assert(d);
	211
	212	if (!d->outputs)
	213	continue;
	214
	215	const int maxlen = 1024;
	216
	217	// TODO For now we ignore that d->outputs is actually a list
	218	if (strncmp((char*)(d->outputs->data), output, maxlen) == 0)
	219	ret_val.push_back(d);
	220	}
	221
	222	return ret_val;
	223	}
	224
	225	void SubWindow::on_item_changed(const QModelIndex& index)
	226	{
	227	QString decoder_name, id, longname, desc, doc, tags;
	228
	229	// If the parent isn't valid, a category title was clicked
	230	if (index.isValid() && index.parent().isValid()) {
	231	QModelIndex id_index = index.model()->index(index.row(), 2, index.parent());
	232	decoder_name = index.model()->data(id_index, Qt::DisplayRole).toString();
	233
	234	if (decoder_name.isEmpty())
	235	return;
	236
	237	const srd_decoder* d = srd_decoder_get_by_id(decoder_name.toUtf8());
	238
	239	id = QString::fromUtf8(d->id);
	240	longname = QString::fromUtf8(d->longname);
	241	desc = QString::fromUtf8(d->desc);
	242	doc = QString::fromUtf8(srd_decoder_doc_get(d)).trimmed();
	243
	244	#if DECODERS_HAVE_TAGS
	245	for (GSList* li = (GSList*)d->tags; li; li = li->next) {
	246	QString s = (li == (GSList*)d->tags) ?
	247	tr((char*)li->data) :
	248	QString(tr(", %1")).arg(tr((char*)li->data));
	249	tags.append(s);
	250	}
	251	#endif
	252	} else
	253	doc = QString(tr(initial_notice));
	254
	255	if (!id.isEmpty())
	256	info_label_header_->setText(
	257	QString("<span style='font-size:large'><b>%1 (%2)</b></span><br><i>%3</i>")
	258	.arg(longname, id, desc));
	259	else
	260	info_label_header_->clear();
	261
	262	info_label_body_->setText(doc);
	263
	264	if (!tags.isEmpty())
	265	info_label_footer_->setText(tr("<p align='right'>Tags: %1</p>").arg(tags));
	266	else
	267	info_label_footer_->clear();
	268	}
	269
	270	void SubWindow::on_item_activated(const QModelIndex& index)
	271	{
	272	if (!index.isValid())
	273	return;
	274
	275	QModelIndex id_index = index.model()->index(index.row(), 2, index.parent());
	276	QString decoder_name = index.model()->data(id_index, Qt::DisplayRole).toString();
	277
	278	const srd_decoder* chosen_decoder = srd_decoder_get_by_id(decoder_name.toUtf8());
	279	if (chosen_decoder == nullptr)
	280	return;
	281
	282	vector<const srd_decoder*> decoders;
	283	decoders.push_back(chosen_decoder);
	284
	285	// If the decoder only depends on logic inputs, we add it and are done
	286	vector<const char*> inputs = get_decoder_inputs(decoders.front());
	287	if (inputs.size() == 0) {
	288	qWarning() << "Protocol decoder" << decoder_name << "cannot have 0 inputs!";
	289	return;
	290	}
	291
	292	if (strcmp(inputs.at(0), "logic") == 0) {
	293	new_decoders_selected(decoders);
	294	return;
	295	}
	296
	297	// Check if we can automatically fulfill the stacking requirements
	298	while (strcmp(inputs.at(0), "logic") != 0) {
	299	vector<const srd_decoder*> prov_decoders = get_decoders_providing(inputs.at(0));
	300
	301	if (prov_decoders.size() == 0) {
	302	// Emit warning and add the stack that we could gather so far
	303	qWarning() << "Protocol decoder" << QString::fromUtf8(decoders.back()->id) \
	304	<< "has input that no other decoder provides:" << QString::fromUtf8(inputs.at(0));
	305	break;
	306	}
	307
	308	if (prov_decoders.size() == 1) {
	309	decoders.push_back(prov_decoders.front());
	310	} else {
	311	// Let user decide which one to use
	312	QString caption = QString(tr("Protocol decoder <b>%1</b> requires input type <b>%2</b> " \
	313	"which several decoders provide.<br>Choose which one to use:<br>"))
	314	.arg(QString::fromUtf8(decoders.back()->id), QString::fromUtf8(inputs.at(0)));
	315
	316	QStringList items;
	317	for (const srd_decoder* d : prov_decoders)
	318	items << QString::fromUtf8(d->id) + " (" + QString::fromUtf8(d->longname) + ")";
	319	bool ok_clicked;
	320	QString item = QInputDialog::getItem(this, tr("Choose Decoder"),
	321	tr(caption.toUtf8()), items, 0, false, &ok_clicked);
	322
	323	if ((!ok_clicked) \|\| (item.isEmpty()))
	324	return;
	325
	326	QString d = item.section(' ', 0, 0);
	327	decoders.push_back(srd_decoder_get_by_id(d.toUtf8()));
	328	}
	329
	330	inputs = get_decoder_inputs(decoders.back());
	331	}
	332
	333	// Reverse decoder list and add the stack
	334	reverse(decoders.begin(), decoders.end());
	335	new_decoders_selected(decoders);
	336	}
	337
	338	void SubWindow::on_filter_changed(const QString& text)
	339	{
	340	sort_filter_model_->setFilterFixedString(text);
	341
	342	// Expand the "All Decoders" category/tag if the user filtered
	343	tree_view_->setExpanded(tree_view_->model()->index(0, 0), !text.isEmpty());
	344	}
	345
	346	void SubWindow::on_filter_return_pressed()
	347	{
	348	int num_visible_decoders = 0;
	349	QModelIndex last_valid_index;
	350
	351	QModelIndex index = tree_view_->model()->index(0, 0);
	352
	353	while (index.isValid()) {
	354	QModelIndex id_index = index.model()->index(index.row(), 2, index.parent());
	355	QString decoder_name = index.model()->data(id_index, Qt::DisplayRole).toString();
	356	if (!decoder_name.isEmpty()) {
	357	last_valid_index = index;
	358	num_visible_decoders++;
	359	}
	360	index = tree_view_->indexBelow(index);
	361	}
	362
	363	// If only one decoder matches the filter, apply it when the user presses enter
	364	if (num_visible_decoders == 1)
	365	tree_view_->activated(last_valid_index);
	366	}
	367
	368	} // namespace decoder_selector
	369	} // namespace subwindows
	370	} // namespace pv