subsurface/desktop-widgets/divelistview.cpp

// SPDX-License-Identifier: GPL-2.0
/*
 * divelistview.cpp
 *
 * classes for the divelist of Subsurface
 *
 */
#include "qt-models/filtermodels.h"
#include "desktop-widgets/modeldelegates.h"
#include "desktop-widgets/mainwindow.h"
#include "desktop-widgets/divepicturewidget.h"
#include "core/display.h"
#include <unistd.h>
#include <QSettings>
#include <QKeyEvent>
#include <QFileDialog>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QStandardPaths>
#include <QMessageBox>
#include <QHeaderView>
#include "core/qthelper.h"
#include "desktop-widgets/undocommands.h"
#include "desktop-widgets/divelistview.h"
#include "qt-models/divepicturemodel.h"
#include "core/metrics.h"

DiveListView::DiveListView(QWidget *parent) : QTreeView(parent), mouseClickSelection(false), sortColumn(0),
	currentOrder(Qt::DescendingOrder), dontEmitDiveChangedSignal(false), selectionSaved(false),
	initialColumnWidths(DiveTripModel::COLUMNS, 50)	// Set up with default length 50
{
	setItemDelegate(new DiveListDelegate(this));
	setUniformRowHeights(true);
	setItemDelegateForColumn(DiveTripModel::RATING, new StarWidgetsDelegate(this));
	MultiFilterSortModel *model = MultiFilterSortModel::instance();
	model->setSortRole(DiveTripModel::SORT_ROLE);
	model->setFilterKeyColumn(-1); // filter all columns
	model->setFilterCaseSensitivity(Qt::CaseInsensitive);
	DiveTripModel *tripModel = new DiveTripModel(this);
	model->setSourceModel(tripModel);
	setModel(model);

	setSortingEnabled(false);
	setContextMenuPolicy(Qt::DefaultContextMenu);
	setSelectionMode(ExtendedSelection);
	header()->setContextMenuPolicy(Qt::ActionsContextMenu);

	header()->setStretchLastSection(true);

	installEventFilter(this);

	for (int i = DiveTripModel::NR; i < DiveTripModel::COLUMNS; i++)
		calculateInitialColumnWidth(tripModel, i);
	setColumnWidths();
}

DiveListView::~DiveListView()
{
	QSettings settings;
	settings.beginGroup("ListWidget");
	// don't set a width for the last column - location is supposed to be "the rest"
	for (int i = DiveTripModel::NR; i < DiveTripModel::COLUMNS - 1; i++) {
		if (isColumnHidden(i))
			continue;
		// we used to hardcode them all to 100 - so that might still be in the settings
		if (columnWidth(i) == 100 || columnWidth(i) == initialColumnWidths[i])
			settings.remove(QString("colwidth%1").arg(i));
		else
			settings.setValue(QString("colwidth%1").arg(i), columnWidth(i));
	}
	settings.remove(QString("colwidth%1").arg(DiveTripModel::COLUMNS - 1));
	settings.endGroup();
}

void DiveListView::calculateInitialColumnWidth(const DiveTripModel &tripModel, int col)
{
	const QFontMetrics metrics(defaultModelFont());
	int em = metrics.width('m');
	int zw = metrics.width('0');

	QString header_txt = tripModel.headerData(col, Qt::Horizontal, Qt::DisplayRole).toString();
	int width = metrics.width(header_txt);
	int sw = 0;
	switch (col) {
	case DiveTripModel::NR:
	case DiveTripModel::DURATION:
		sw = 8*zw;
		break;
	case DiveTripModel::DATE:
		sw = 14*em;
		break;
	case DiveTripModel::RATING:
		sw = static_cast<StarWidgetsDelegate*>(itemDelegateForColumn(col))->starSize().width();
		break;
	case DiveTripModel::SUIT:
	case DiveTripModel::SAC:
		sw = 7*em;
		break;
	case DiveTripModel::PHOTOS:
		sw = 5*em;
		break;
	case DiveTripModel::LOCATION:
		sw = 50*em;
		break;
	default:
		sw = 5*em;
	}
	if (sw > width)
		width = sw;
	width += zw; // small padding
	initialColumnWidths[col] = std::max(initialColumnWidths[col], width);
}

void DiveListView::setColumnWidths()
{
	QSettings settings;
	backupExpandedRows();
	settings.beginGroup("ListWidget");
	/* if no width are set, use the calculated width for each column;
	 * for that to work we need to temporarily expand all rows */
	expandAll();
	for (int i = DiveTripModel::NR; i < DiveTripModel::COLUMNS; i++) {
		if (isColumnHidden(i))
			continue;
		QVariant width = settings.value(QString("colwidth%1").arg(i));
		if (width.isValid())
			setColumnWidth(i, width.toInt());
		else
			setColumnWidth(i, initialColumnWidths[i]);
	}
	settings.endGroup();
	restoreExpandedRows();
	setColumnWidth(lastVisibleColumn(), 10);
}

int DiveListView::lastVisibleColumn()
{
	int lastColumn = -1;
	for (int i = DiveTripModel::NR; i < DiveTripModel::COLUMNS; i++) {
		if (isColumnHidden(i))
			continue;
		lastColumn = i;
	}
	return lastColumn;
}

void DiveListView::backupExpandedRows()
{
	expandedRows.clear();
	for (int i = 0; i < model()->rowCount(); i++)
		if (isExpanded(model()->index(i, 0)))
			expandedRows.push_back(i);
}

void DiveListView::restoreExpandedRows()
{
	setAnimated(false);
	Q_FOREACH (const int &i, expandedRows)
		setExpanded(model()->index(i, 0), true);
	setAnimated(true);
}

// If the model is reset, check which items are trip-items and expand the first column
void DiveListView::reset()
{
	// First, let the QTreeView do its thing.
	QTreeView::reset();

	QAbstractItemModel *m = model();
	for (int i = 0; i < m->rowCount(); ++i) {
		if (m->rowCount(m->index(i, 0)) != 0)
			setFirstColumnSpanned(i, QModelIndex(), true);
	}
}

// If rows are added, check which of these rows is a trip and expand the first column
void DiveListView::rowsInserted(const QModelIndex &parent, int start, int end)
{
	// First, let the QTreeView do its thing.
	QTreeView::rowsInserted(parent, start, end);

	// Now check for each inserted row whether this is a trip and expand the first column
	if (parent.isValid()) // Trips don't have a parent
		return;
	QAbstractItemModel *m = model();
	for (int i = start; i <= end; ++i) {
		if (m->rowCount(m->index(i, 0)) != 0)
			setFirstColumnSpanned(i, QModelIndex(), true);
	}
}

// this only remembers dives that were selected, not trips
void DiveListView::rememberSelection()
{
	selectedDives.clear();
	QItemSelection selection = selectionModel()->selection();
	Q_FOREACH (const QModelIndex &index, selection.indexes()) {
		if (index.column() != 0) // We only care about the dives, so, let's stick to rows and discard columns.
			continue;
		struct dive *d = (struct dive *)index.data(DiveTripModel::DIVE_ROLE).value<void *>();
		if (d) {
			selectedDives.insert(d->divetrip, get_divenr(d));
		} else {
			struct dive_trip *t = (struct dive_trip *)index.data(DiveTripModel::TRIP_ROLE).value<void *>();
			if (t)
				selectedDives.insert(t, -1);
		}
	}
	selectionSaved = true;
}

void DiveListView::restoreSelection()
{
	if (!selectionSaved)
		return;

	selectionSaved = false;
	dontEmitDiveChangedSignal = true;
	unselectDives();
	dontEmitDiveChangedSignal = false;
	Q_FOREACH (dive_trip_t *trip, selectedDives.keys()) {
		QList<int> divesOnTrip = getDivesInTrip(trip);
		QList<int> selectedDivesOnTrip = selectedDives.values(trip);

		// Only select trip if all of its dives were selected
		if(selectedDivesOnTrip.contains(-1)) {
			selectTrip(trip);
			selectedDivesOnTrip.removeAll(-1);
		}
		selectDives(selectedDivesOnTrip);
	}
}

void DiveListView::selectTrip(dive_trip_t *trip)
{
	if (!trip)
		return;

	QSortFilterProxyModel *m = qobject_cast<QSortFilterProxyModel *>(model());
	QModelIndexList match = m->match(m->index(0, 0), DiveTripModel::TRIP_ROLE, QVariant::fromValue<void *>(trip), 2, Qt::MatchRecursive);
	QItemSelectionModel::SelectionFlags flags;
	if (!match.count())
		return;
	QModelIndex idx = match.first();
	flags = QItemSelectionModel::Select;
	flags |= QItemSelectionModel::Rows;
	selectionModel()->select(idx, flags);
	expand(idx);
}

// this is an odd one - when filtering the dive list the selection status of the trips
// is kept - but all other selections are lost. That's gets us into rather inconsistent state
// we call this function which clears the selection state of the trips as well, but does so
// without updating our internal "->selected" state. So once we called this function we can
// go back and select those dives that are still visible under the filter and everything
// works as expected
void DiveListView::clearTripSelection()
{
	// we want to make sure no trips are selected
	disconnect(selectionModel(), SIGNAL(selectionChanged(QItemSelection, QItemSelection)), this, SLOT(selectionChanged(QItemSelection, QItemSelection)));
	disconnect(selectionModel(), SIGNAL(currentChanged(QModelIndex, QModelIndex)), this, SLOT(currentChanged(QModelIndex, QModelIndex)));

	Q_FOREACH (const QModelIndex &index, selectionModel()->selectedRows()) {
		dive_trip_t *trip = static_cast<dive_trip_t *>(index.data(DiveTripModel::TRIP_ROLE).value<void *>());
		if (!trip)
			continue;
		selectionModel()->select(index, QItemSelectionModel::Deselect);
	}

	connect(selectionModel(), SIGNAL(selectionChanged(QItemSelection, QItemSelection)), this, SLOT(selectionChanged(QItemSelection, QItemSelection)));
	connect(selectionModel(), SIGNAL(currentChanged(QModelIndex, QModelIndex)), this, SLOT(currentChanged(QModelIndex, QModelIndex)));
}

void DiveListView::unselectDives()
{
	// make sure we don't try to redraw the dives during the selection change
	selected_dive = -1;
	amount_selected = 0;
	// clear the Qt selection
	selectionModel()->clearSelection();
	// clearSelection should emit selectionChanged() but sometimes that
	// appears not to happen
	// since we are unselecting all dives there is no need to use deselect_dive() - that
	// would only cause pointless churn
	int i;
	struct dive *dive;
	for_each_dive (i, dive) {
		dive->selected = false;
	}
}

QList<dive_trip_t *> DiveListView::selectedTrips()
{
	QList<dive_trip_t *> ret;
	Q_FOREACH (const QModelIndex &index, selectionModel()->selectedRows()) {
		dive_trip_t *trip = static_cast<dive_trip_t *>(index.data(DiveTripModel::TRIP_ROLE).value<void *>());
		if (!trip)
			continue;
		ret.push_back(trip);
	}
	return ret;
}

void DiveListView::selectDive(int i, bool scrollto, bool toggle)
{
	if (i == -1)
		return;
	QSortFilterProxyModel *m = qobject_cast<QSortFilterProxyModel *>(model());
	QModelIndexList match = m->match(m->index(0, 0), DiveTripModel::DIVE_IDX, i, 2, Qt::MatchRecursive);
	QItemSelectionModel::SelectionFlags flags;
	if (match.isEmpty())
		return;
	QModelIndex idx = match.first();
	flags = toggle ? QItemSelectionModel::Toggle : QItemSelectionModel::Select;
	flags |= QItemSelectionModel::Rows;
	selectionModel()->setCurrentIndex(idx, flags);
	if (idx.parent().isValid()) {
		setAnimated(false);
		expand(idx.parent());
		if (scrollto)
			scrollTo(idx.parent());
		setAnimated(true);
	}
	if (scrollto)
		scrollTo(idx, PositionAtCenter);
}

void DiveListView::selectDives(const QList<int> &newDiveSelection)
{
	int firstInList, newSelection;
	struct dive *d;

	if (!newDiveSelection.count())
		return;

	dontEmitDiveChangedSignal = true;
	// select the dives, highest index first - this way the oldest of the dives
	// becomes the selected_dive that we scroll to
	QList<int> sortedSelection = newDiveSelection;
	qSort(sortedSelection.begin(), sortedSelection.end());
	newSelection = firstInList = sortedSelection.first();

	while (!sortedSelection.isEmpty())
		selectDive(sortedSelection.takeLast());

	while (selected_dive == -1) {
		// that can happen if we restored a selection after edit
		// and the only selected dive is no longer visible because of a filter
		newSelection--;
		if (newSelection < 0)
			newSelection = dive_table.nr - 1;
		if (newSelection == firstInList)
			break;
		if ((d = get_dive(newSelection)) != NULL && !d->hidden_by_filter)
			selectDive(newSelection);
	}
	QSortFilterProxyModel *m = qobject_cast<QSortFilterProxyModel *>(model());
	QModelIndexList idxList = m->match(m->index(0, 0), DiveTripModel::DIVE_IDX, selected_dive, 2, Qt::MatchRecursive);
	if (!idxList.isEmpty()) {
		QModelIndex idx = idxList.first();
		if (idx.parent().isValid())
			scrollTo(idx.parent());
		scrollTo(idx);
	}
	// now that everything is up to date, update the widgets
	emit currentDiveChanged();
	dontEmitDiveChangedSignal = false;
	return;
}

bool DiveListView::eventFilter(QObject *, QEvent *event)
{
	if (event->type() != QEvent::KeyPress)
		return false;
	QKeyEvent *keyEv = static_cast<QKeyEvent *>(event);
	if (keyEv->key() == Qt::Key_Delete) {
		contextMenuIndex = currentIndex();
		deleteDive();
	}
	if (keyEv->key() != Qt::Key_Escape)
		return false;
	return true;
}

// NOTE! This loses trip selection, because while we remember the
// dives, we don't remember the trips (see the "currentSelectedDives"
// list). I haven't figured out how to look up the trip from the
// index. TRIP_ROLE vs DIVE_ROLE?
void DiveListView::headerClicked(int i)
{
	DiveTripModel::Layout newLayout = i == (int)DiveTripModel::NR ? DiveTripModel::TREE : DiveTripModel::LIST;
	rememberSelection();
	unselectDives();
	/* No layout change? Just re-sort, and scroll to first selection, making sure all selections are expanded */
	if (currentLayout == newLayout) {
		currentOrder = (currentOrder == Qt::DescendingOrder) ? Qt::AscendingOrder : Qt::DescendingOrder;
		sortByColumn(i, currentOrder);
	} else {
		// clear the model, repopulate with new indexes.
		if (currentLayout == DiveTripModel::TREE) {
			backupExpandedRows();
		}
		reload(newLayout, false);
		currentOrder = Qt::DescendingOrder;
		sortByColumn(i, currentOrder);
		if (newLayout == DiveTripModel::TREE) {
			restoreExpandedRows();
		}
	}
	restoreSelection();
	// remember the new sort column
	sortColumn = i;
}

void DiveListView::reload(DiveTripModel::Layout layout, bool forceSort)
{
	if (layout == DiveTripModel::CURRENT)
		layout = currentLayout;
	else
		currentLayout = layout;

	header()->setSectionsClickable(true);
	connect(header(), SIGNAL(sectionPressed(int)), this, SLOT(headerClicked(int)), Qt::UniqueConnection);

	QSortFilterProxyModel *m = qobject_cast<QSortFilterProxyModel *>(model());
	QAbstractItemModel *oldModel = m->sourceModel();
	DiveTripModel *tripModel = new DiveTripModel(this);
	tripModel->setLayout(layout);

	m->setSourceModel(tripModel);
	if (oldModel)
		delete oldModel;

	if (!forceSort)
		return;

	sortByColumn(sortColumn, currentOrder);
	if (amount_selected && current_dive != NULL) {
		selectDive(selected_dive, true);
	} else {
		QModelIndex firstDiveOrTrip = m->index(0, 0);
		if (firstDiveOrTrip.isValid()) {
			if (m->index(0, 0, firstDiveOrTrip).isValid())
				setCurrentIndex(m->index(0, 0, firstDiveOrTrip));
			else
				setCurrentIndex(firstDiveOrTrip);
		}
	}
	if (selectedIndexes().count()) {
		QModelIndex curr = selectedIndexes().first();
		curr = curr.parent().isValid() ? curr.parent() : curr;
		if (!isExpanded(curr)) {
			setAnimated(false);
			expand(curr);
			scrollTo(curr);
			setAnimated(true);
		}
	}
}

void DiveListView::reloadHeaderActions()
{
	// Populate the context menu of the headers that will show
	// the menu to show / hide columns.
	if (!header()->actions().size()) {
		QSettings s;
		s.beginGroup("DiveListColumnState");
		for (int i = 0; i < model()->columnCount(); i++) {
			QString title = QString("%1").arg(model()->headerData(i, Qt::Horizontal).toString());
			QString settingName = QString("showColumn%1").arg(i);
			QAction *a = new QAction(title, header());
			bool showHeaderFirstRun = !(i == DiveTripModel::MAXCNS ||
						    i == DiveTripModel::GAS ||
						    i == DiveTripModel::OTU ||
						    i == DiveTripModel::TEMPERATURE ||
						    i == DiveTripModel::TOTALWEIGHT ||
						    i == DiveTripModel::SUIT ||
						    i == DiveTripModel::CYLINDER ||
						    i == DiveTripModel::SAC ||
						    i == DiveTripModel::TAGS);
			bool shown = s.value(settingName, showHeaderFirstRun).toBool();
			a->setCheckable(true);
			a->setChecked(shown);
			a->setProperty("index", i);
			a->setProperty("settingName", settingName);
			connect(a, SIGNAL(triggered(bool)), this, SLOT(toggleColumnVisibilityByIndex()));
			header()->addAction(a);
			setColumnHidden(i, !shown);
		}
		s.endGroup();
	} else {
		for (int i = 0; i < model()->columnCount(); i++) {
			QString title = QString("%1").arg(model()->headerData(i, Qt::Horizontal).toString());
			header()->actions()[i]->setText(title);
		}
	}
}

void DiveListView::toggleColumnVisibilityByIndex()
{
	QAction *action = qobject_cast<QAction *>(sender());
	if (!action)
		return;

	QSettings s;
	s.beginGroup("DiveListColumnState");
	s.setValue(action->property("settingName").toString(), action->isChecked());
	s.endGroup();
	s.sync();
	setColumnHidden(action->property("index").toInt(), !action->isChecked());
	setColumnWidth(lastVisibleColumn(), 10);
}

void DiveListView::currentChanged(const QModelIndex &current, const QModelIndex&)
{
	if (!isVisible())
		return;
	if (!current.isValid())
		return;
	scrollTo(current);
}

void DiveListView::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
{
	QItemSelection newSelected = selected.size() ? selected : selectionModel()->selection();
	QItemSelection newDeselected = deselected;

	disconnect(selectionModel(), SIGNAL(selectionChanged(QItemSelection, QItemSelection)), this, SLOT(selectionChanged(QItemSelection, QItemSelection)));
	disconnect(selectionModel(), SIGNAL(currentChanged(QModelIndex, QModelIndex)), this, SLOT(currentChanged(QModelIndex, QModelIndex)));

	Q_FOREACH (const QModelIndex &index, newDeselected.indexes()) {
		if (index.column() != 0)
			continue;
		const QAbstractItemModel *model = index.model();
		struct dive *dive = (struct dive *)model->data(index, DiveTripModel::DIVE_ROLE).value<void *>();
		if (!dive) // it's a trip!
			deselect_dives_in_trip((dive_trip_t *)model->data(index, DiveTripModel::TRIP_ROLE).value<void *>());
		else
			deselect_dive(get_divenr(dive));
	}
	Q_FOREACH (const QModelIndex &index, newSelected.indexes()) {
		if (index.column() != 0)
			continue;

		const QAbstractItemModel *model = index.model();
		struct dive *dive = (struct dive *)model->data(index, DiveTripModel::DIVE_ROLE).value<void *>();
		if (!dive) { // it's a trip!
			if (model->rowCount(index)) {
				QItemSelection selection;
				select_dives_in_trip((dive_trip_t *)model->data(index, DiveTripModel::TRIP_ROLE).value<void *>());
				selection.select(index.child(0, 0), index.child(model->rowCount(index) - 1, 0));
				selectionModel()->select(selection, QItemSelectionModel::Select | QItemSelectionModel::Rows);
				selectionModel()->setCurrentIndex(index, QItemSelectionModel::Select | QItemSelectionModel::NoUpdate);
				if (!isExpanded(index))
					expand(index);
			}
		} else {
			select_dive(get_divenr(dive));
		}
	}
	QTreeView::selectionChanged(selectionModel()->selection(), newDeselected);
	connect(selectionModel(), SIGNAL(selectionChanged(QItemSelection, QItemSelection)), this, SLOT(selectionChanged(QItemSelection, QItemSelection)));
	connect(selectionModel(), SIGNAL(currentChanged(QModelIndex, QModelIndex)), this, SLOT(currentChanged(QModelIndex, QModelIndex)));
	if (!dontEmitDiveChangedSignal)
		emit currentDiveChanged();
}

enum asked_user {NOTYET, MERGE, DONTMERGE};

static bool can_merge(const struct dive *a, const struct dive *b, enum asked_user *have_asked)
{
	if (!a || !b)
		return false;
	if (a->when > b->when)
		return false;
	/* Don't merge dives if there's more than half an hour between them */
	if (dive_endtime(a) + 30 * 60 < b->when) {
		if (*have_asked == NOTYET) {
			if (QMessageBox::warning(MainWindow::instance(),
						 MainWindow::tr("Warning"),
						 MainWindow::tr("Trying to merge dives with %1min interval in between").arg(
							 (b->when - dive_endtime(a)) / 60),
					     QMessageBox::Ok | QMessageBox::Cancel) == QMessageBox::Cancel) {
				*have_asked = DONTMERGE;
				return false;
			} else {
				*have_asked = MERGE;
				return true;
			}
		} else {
			return *have_asked == MERGE ? true : false;
		}
	}
	return true;
}

void DiveListView::mergeDives()
{
	int i;
	struct dive *dive, *maindive = NULL;
	enum asked_user have_asked = NOTYET;

	for_each_dive (i, dive) {
		if (dive->selected) {
			if (!can_merge(maindive, dive, &have_asked)) {
				maindive = dive;
			} else {
				maindive = merge_two_dives(maindive, dive);
				i--; // otherwise we skip a dive in the freshly changed list
			}
		}
	}
	MainWindow::instance()->refreshProfile();
	MainWindow::instance()->refreshDisplay();
}

void DiveListView::splitDives()
{
	int i;
	struct dive *dive;

	for_each_dive (i, dive) {
		if (dive->selected)
			split_dive(dive);
	}
	MainWindow::instance()->refreshProfile();
	MainWindow::instance()->refreshDisplay();
}

void DiveListView::renumberDives()
{
	RenumberDialog::instance()->renumberOnlySelected();
	RenumberDialog::instance()->show();
}

void DiveListView::merge_trip(const QModelIndex &a, int offset)
{
	int i = a.row() + offset;
	QModelIndex b = a.sibling(i, 0);

	dive_trip_t *trip_a = (dive_trip_t *)a.data(DiveTripModel::TRIP_ROLE).value<void *>();
	dive_trip_t *trip_b = (dive_trip_t *)b.data(DiveTripModel::TRIP_ROLE).value<void *>();
	if (trip_a == trip_b || !trip_a || !trip_b)
		return;
	combine_trips(trip_a, trip_b);
	rememberSelection();
	reload(currentLayout, false);
	restoreSelection();
	mark_divelist_changed(true);
	//TODO: emit a signal to signalize that the divelist changed?
}

void DiveListView::mergeTripAbove()
{
	merge_trip(contextMenuIndex, -1);
}

void DiveListView::mergeTripBelow()
{
	merge_trip(contextMenuIndex, +1);
}

void DiveListView::removeFromTrip()
{
	//TODO: move this to C-code.
	int i;
	struct dive *d;
	QMap<struct dive*, dive_trip*> divesToRemove;
	for_each_dive (i, d) {
		if (d->selected)
			divesToRemove.insert(d, d->divetrip);
	}
	UndoRemoveDivesFromTrip *undoCommand = new UndoRemoveDivesFromTrip(divesToRemove);
	MainWindow::instance()->undoStack->push(undoCommand);

	rememberSelection();
	reload(currentLayout, false);
	restoreSelection();
	mark_divelist_changed(true);
}

void DiveListView::newTripAbove()
{
	struct dive *d = (struct dive *)contextMenuIndex.data(DiveTripModel::DIVE_ROLE).value<void *>();
	if (!d) // shouldn't happen as we only are setting up this action if this is a dive
		return;
	//TODO: port to c-code.
	dive_trip_t *trip;
	int idx;
	rememberSelection();
	trip = create_and_hookup_trip_from_dive(d);
	for_each_dive (idx, d) {
		if (d->selected)
			add_dive_to_trip(d, trip);
	}
	trip->expanded = 1;
	reload(currentLayout, false);
	mark_divelist_changed(true);
	restoreSelection();
}

void DiveListView::addToTripBelow()
{
	addToTrip(1);
}

void DiveListView::addToTripAbove()
{
	addToTrip(-1);
}

void DiveListView::addToTrip(int delta)
{
	// d points to the row that has (mouse-)pointer focus, and there are nr rows selected
	struct dive *d = (struct dive *)contextMenuIndex.data(DiveTripModel::DIVE_ROLE).value<void *>();
	int nr = selectionModel()->selectedRows().count();
	QModelIndex t;
	dive_trip_t *trip = NULL;

	// now look for the trip to add to, for this, loop over the selected dives and
	// check if its sibling is a trip.
	for (int i = 1; i <= nr; i++) {
		t = contextMenuIndex.sibling(contextMenuIndex.row() + (delta > 0 ? i: i * -1), 0);
		trip = (dive_trip_t *)t.data(DiveTripModel::TRIP_ROLE).value<void *>();
		if (trip)
			break;
	}

	if (!trip || !d)
		// no dive, no trip? get me out of here
		return;

	rememberSelection();

	add_dive_to_trip(d, trip);
	if (d->selected) { // there are possibly other selected dives that we should add
		int idx;
		for_each_dive (idx, d) {
			if (d->selected)
				add_dive_to_trip(d, trip);
		}
	}
	trip->expanded = 1;
	mark_divelist_changed(true);

	reload(currentLayout, false);
	restoreSelection();
}

void DiveListView::markDiveInvalid()
{
	int i;
	struct dive *d = (struct dive *)contextMenuIndex.data(DiveTripModel::DIVE_ROLE).value<void *>();
	if (!d)
		return;
	for_each_dive (i, d) {
		if (!d->selected)
			continue;
		//TODO: this should be done in the future
		// now mark the dive invalid... how do we do THAT?
		// d->invalid = true;
	}
	if (amount_selected == 0) {
		MainWindow::instance()->cleanUpEmpty();
	}
	mark_divelist_changed(true);
	MainWindow::instance()->refreshDisplay();
	if (prefs.display_invalid_dives == false) {
		clearSelection();
		// select top dive that isn't marked invalid
		rememberSelection();
	}
}

void DiveListView::deleteDive()
{
	struct dive *d = (struct dive *)contextMenuIndex.data(DiveTripModel::DIVE_ROLE).value<void *>();
	if (!d)
		return;

	int i;
	int lastDiveNr = -1;
	QList<struct dive*> deletedDives; //a list of all deleted dives to be stored in the undo command
	for_each_dive (i, d) {
		if (!d->selected)
			continue;
		deletedDives.append(d);
		lastDiveNr = i;
	}
	// the actual dive deletion is happening in the redo command that is implicitly triggered
	UndoDeleteDive *undoEntry = new UndoDeleteDive(deletedDives);
	MainWindow::instance()->undoStack->push(undoEntry);
	if (amount_selected == 0) {
		MainWindow::instance()->cleanUpEmpty();
	}
	mark_divelist_changed(true);
	MainWindow::instance()->refreshDisplay();
	if (lastDiveNr != -1) {
		clearSelection();
		selectDive(lastDiveNr);
		rememberSelection();
	}
}

void DiveListView::contextMenuEvent(QContextMenuEvent *event)
{
	QAction *collapseAction = NULL;
	// let's remember where we are
	contextMenuIndex = indexAt(event->pos());
	struct dive *d = (struct dive *)contextMenuIndex.data(DiveTripModel::DIVE_ROLE).value<void *>();
	dive_trip_t *trip = (dive_trip_t *)contextMenuIndex.data(DiveTripModel::TRIP_ROLE).value<void *>();
	QMenu popup(this);
	if (currentLayout == DiveTripModel::TREE) {
		// verify if there is a node that`s not expanded.
		bool needs_expand = false;
		bool needs_collapse = false;
		uint expanded_nodes = 0;
		for(int i = 0, end = model()->rowCount(); i < end; i++) {
			QModelIndex idx = model()->index(i, 0);
			if (idx.data(DiveTripModel::DIVE_ROLE).value<void *>())
				continue;

			if (!isExpanded(idx)) {
				needs_expand = true;
			} else {
				needs_collapse = true;
				expanded_nodes ++;
			}
		}
		if (needs_expand)
			popup.addAction(tr("Expand all"), this, SLOT(expandAll()));
		if (needs_collapse)
			popup.addAction(tr("Collapse all"), this, SLOT(collapseAll()));

		// verify if there`s a need for collapse others
		if (expanded_nodes > 1)
			collapseAction = popup.addAction(tr("Collapse others"), this, SLOT(collapseAll()));


		if (d) {
			popup.addAction(tr("Remove dive(s) from trip"), this, SLOT(removeFromTrip()));
			popup.addAction(tr("Create new trip above"), this, SLOT(newTripAbove()));
			if (!d->divetrip) {
				struct dive *top = d;
				struct dive *bottom = d;
				if (d->selected) {
					if (currentOrder == Qt::AscendingOrder) {
						top = first_selected_dive();
						bottom = last_selected_dive();
					} else {
						top = last_selected_dive();
						bottom = first_selected_dive();
					}
				}
				if (is_trip_before_after(top, (currentOrder == Qt::AscendingOrder)))
					popup.addAction(tr("Add dive(s) to trip immediately above"), this, SLOT(addToTripAbove()));
				if (is_trip_before_after(bottom, (currentOrder == Qt::DescendingOrder)))
					popup.addAction(tr("Add dive(s) to trip immediately below"), this, SLOT(addToTripBelow()));
			}
		}
		if (trip) {
			popup.addAction(tr("Merge trip with trip above"), this, SLOT(mergeTripAbove()));
			popup.addAction(tr("Merge trip with trip below"), this, SLOT(mergeTripBelow()));
		}
	}
	if (d) {
		popup.addAction(tr("Delete dive(s)"), this, SLOT(deleteDive()));
#if 0
		popup.addAction(tr("Mark dive(s) invalid", this, SLOT(markDiveInvalid())));
#endif
	}
	if (amount_selected > 1 && consecutive_selected())
		popup.addAction(tr("Merge selected dives"), this, SLOT(mergeDives()));
	if (amount_selected >= 1) {
		popup.addAction(tr("Renumber dive(s)"), this, SLOT(renumberDives()));
		popup.addAction(tr("Shift dive times"), this, SLOT(shiftTimes()));
		popup.addAction(tr("Split selected dives"), this, SLOT(splitDives()));
		popup.addAction(tr("Load image(s) from file(s)"), this, SLOT(loadImages()));
		popup.addAction(tr("Load image from web"), this, SLOT(loadWebImages()));
	}

	// "collapse all" really closes all trips,
	// "collapse" keeps the trip with the selected dive open
	QAction *actionTaken = popup.exec(event->globalPos());
	if (actionTaken == collapseAction && collapseAction) {
		this->setAnimated(false);
		selectDive(selected_dive, true);
		scrollTo(selectedIndexes().first());
		this->setAnimated(true);
	}
	event->accept();
}

void DiveListView::shiftTimes()
{
	ShiftTimesDialog::instance()->show();
}

void DiveListView::loadImages()
{
	QStringList m_filters = mediaExtensionFilters();
	QStringList i_filters = imageExtensionFilters();
	QStringList v_filters = videoExtensionFilters();
	QStringList fileNames = QFileDialog::getOpenFileNames(this,
							      tr("Open media files"),
							      lastUsedImageDir(),
							      QString("%1 (%2);;%3 (%4);;%5 (%6);;%7 (*.*)")
							      .arg(tr("Media files"), m_filters.join(" ")
							      , tr("Image files"), i_filters.join(" ")
							      , tr("Video files"), v_filters.join(" ")
							      , tr("All files")));

	if (fileNames.isEmpty())
		return;
	updateLastUsedImageDir(QFileInfo(fileNames[0]).dir().path());
	matchImagesToDives(fileNames);
}

void DiveListView::matchImagesToDives(QStringList fileNames)
{
	ShiftImageTimesDialog shiftDialog(this, fileNames);
	shiftDialog.setOffset(lastImageTimeOffset());
	if (!shiftDialog.exec())
		return;
	updateLastImageTimeOffset(shiftDialog.amount());

	Q_FOREACH (const QString &fileName, fileNames) {
		int j = 0;
		struct dive *dive;
		for_each_dive (j, dive) {
			if (!dive->selected)
				continue;
			dive_create_picture(dive, copy_qstring(fileName), shiftDialog.amount(), shiftDialog.matchAll());
		}
	}

	mark_divelist_changed(true);
	copy_dive(current_dive, &displayed_dive);
	DivePictureModel::instance()->updateDivePictures();
}

void DiveListView::loadWebImages()
{
	URLDialog urlDialog(this);
	if (!urlDialog.exec())
		return;
	loadImageFromURL(QUrl::fromUserInput(urlDialog.url()));
}

void DiveListView::loadImageFromURL(QUrl url)
{
	if (url.isValid()) {
		QEventLoop loop;
		QNetworkRequest request(url);
		QNetworkReply *reply = manager.get(request);
		while (reply->isRunning()) {
			loop.processEvents();
			sleep(1);
		}
		QByteArray imageData = reply->readAll();

		QImage image = QImage();
		image.loadFromData(imageData);
		if (image.isNull()) {
			// If this is not an image, maybe it's an html file and Miika can provide some xslr magic to extract images.
			// In this case we would call the function recursively on the list of image source urls;
			report_error(qPrintable(tr("%1 does not appear to be an image").arg(url.toString())));
			return;
		}

		QCryptographicHash hash(QCryptographicHash::Sha1);
		hash.addData(url.toString().toUtf8());
		QString path = QStandardPaths::standardLocations(QStandardPaths::CacheLocation).first();
		QDir dir(path);
		if (!dir.exists())
			dir.mkpath(path);
		QFile imageFile(path.append("/").append(hash.result().toHex()));
		if (imageFile.open(QIODevice::WriteOnly)) {
			QDataStream stream(&imageFile);
			stream.writeRawData(imageData.data(), imageData.length());
			imageFile.waitForBytesWritten(-1);
			imageFile.close();
			learnPictureFilename(url.toString(), imageFile.fileName());
			matchImagesToDives(QStringList(url.toString()));
		}
	}
}

QString DiveListView::lastUsedImageDir()
{
	QSettings settings;
	QString lastImageDir = QDir::homePath();

	settings.beginGroup("FileDialog");
	if (settings.contains("LastImageDir"))
		if (QDir(settings.value("LastImageDir").toString()).exists())
			lastImageDir = settings.value("LastImageDir").toString();
	return lastImageDir;
}

void DiveListView::updateLastUsedImageDir(const QString &dir)
{
	QSettings s;
	s.beginGroup("FileDialog");
	s.setValue("LastImageDir", dir);
}

int DiveListView::lastImageTimeOffset()
{
	QSettings settings;
	int offset = 0;

	settings.beginGroup("MainWindow");
	if (settings.contains("LastImageTimeOffset"))
		offset = settings.value("LastImageTimeOffset").toInt();
	return offset;
}

void DiveListView::updateLastImageTimeOffset(const int offset)
{
	QSettings s;
	s.beginGroup("MainWindow");
	s.setValue("LastImageTimeOffset", offset);
}

void DiveListView::mouseDoubleClickEvent(QMouseEvent*)
{
	return;
}