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Dive list: move sort-functionality into core

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To make sorting more controlled, move all sorting functions into
the core. For this, introduce a "dive_or_trip" structure, which
represents a top-level item. Adapt the DiveTripModel accordingly.
There are now three sorting functions:
	1) dive_less_than
	2) trip_less_than
	3) dive_or_trip_less_than
These should be used by all sorting code. By moving them to a
single place, the mess can hopefully be cleaned up.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2018-11-10 09:07:42 +01:00 • committed by Dirk Hohndel
parent ef98a4ff5a
commit 243962a67a
4 changed files with 72 additions and 57 deletions
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57
qt-models/divetripmodel.cpp
View file

@ -300,7 +300,7 @@ int DiveTripModel::rowCount(const QModelIndex &parent) const
// Only trips have items
const Item &entry = items[parent.row()];
return entry.trip ? entry.dives.size() : 0;
return entry.d_or_t.trip ? entry.dives.size() : 0;
}
static const quintptr noParent = ~(quintptr)0; // This is the "internalId" marker for top-level item
@ -437,34 +437,33 @@ QVariant DiveTripModel::headerData(int section, Qt::Orientation orientation, int
return QVariant();
}
DiveTripModel::Item::Item(dive_trip *t, const QVector<dive *> &divesIn) : trip(t),
DiveTripModel::Item::Item(dive_trip *t, const QVector<dive *> &divesIn) : d_or_t{nullptr, t},
dives(divesIn.toStdVector())
{
}
DiveTripModel::Item::Item(dive_trip *t, dive *d) : trip(t),
DiveTripModel::Item::Item(dive_trip *t, dive *d) : d_or_t{nullptr, t},
dives({ d })
{
}
DiveTripModel::Item::Item(dive *d) : trip(nullptr),
dives({ d })
DiveTripModel::Item::Item(dive *d) : d_or_t{d, nullptr}
{
}
bool DiveTripModel::Item::isDive(const dive *d) const
{
return !trip && dives.size() == 1 && dives[0] == d;
return d_or_t.dive == d;
}
dive *DiveTripModel::Item::getDive() const
{
return !trip && dives.size() == 1 ? dives[0] : nullptr;
return d_or_t.dive;
}
timestamp_t DiveTripModel::Item::when() const
{
return trip ? trip->when : dives[0]->when;
return d_or_t.trip ? d_or_t.trip->when : d_or_t.dive->when;
}
// Find a range of matching elements in a vector.
@ -572,9 +571,9 @@ void DiveTripModel::setupModelData()
}
// Check if that trip is already known to us: search for the first item
// where item->trip is equal to trip.
// that corresponds to that trip
auto it = std::find_if(items.begin(), items.end(), [trip](const Item &item)
{ return item.trip == trip; });
{ return item.d_or_t.trip == trip; });
if (it == items.end()) {
// We didn't find an entry for this trip -> add one
items.emplace_back(trip, d);
@ -593,28 +592,23 @@ void DiveTripModel::setLayout(DiveTripModel::Layout layout)
setupModelData();
}
QPair<dive_trip *, dive *> DiveTripModel::tripOrDive(const QModelIndex &index) const
dive_or_trip DiveTripModel::tripOrDive(const QModelIndex &index) const
{
if (!index.isValid())
return { nullptr, nullptr };
QModelIndex parent = index.parent();
// An invalid parent means that we're at the top-level
if (!parent.isValid()) {
const Item &entry = items[index.row()];
if (entry.trip)
return { entry.trip, nullptr }; // A trip
else
return { nullptr, entry.dives[0] }; // A dive
}
if (!parent.isValid())
return items[index.row()].d_or_t;
// Otherwise, we're at a leaf -> thats a dive
return { nullptr, items[parent.row()].dives[index.row()] };
return { items[parent.row()].dives[index.row()], nullptr };
}
dive *DiveTripModel::diveOrNull(const QModelIndex &index) const
{
return tripOrDive(index).second;
return tripOrDive(index).dive;
}
QVariant DiveTripModel::data(const QModelIndex &index, int role) const
@ -623,11 +617,11 @@ QVariant DiveTripModel::data(const QModelIndex &index, int role) const
if (role == Qt::FontRole)
return defaultModelFont();
auto entry = tripOrDive(index);
if (entry.first)
return tripData(entry.first, index.column(), role);
else if (entry.second)
return diveData(entry.second, index.column(), role);
dive_or_trip entry = tripOrDive(index);
if (entry.trip)
return tripData(entry.trip, index.column(), role);
else if (entry.dive)
return diveData(entry.dive, index.column(), role);
else
return QVariant();
}
@ -662,7 +656,7 @@ bool DiveTripModel::setData(const QModelIndex &index, const QVariant &value, int
int DiveTripModel::findTripIdx(const dive_trip *trip) const
{
for (int i = 0; i < (int)items.size(); ++i)
if (items[i].trip == trip)
if (items[i].d_or_t.trip == trip)
return i;
return -1;
}
@ -753,11 +747,8 @@ void DiveTripModel::addDivesToTrip(int trip, const QVector<dive *> &dives)
// before the trip in the case of equal timestamps.
bool DiveTripModel::dive_before_entry(const dive *d, const Item &entry)
{
// Dives at the same time come afer trips in ascending mode, therefore use the "<" operator.
// This makes them appear as before trips in descending mode.
if (entry.trip)
return d->when < entry.trip->when;
return dive_less_than(d, entry.getDive());
dive_or_trip d_or_t { (dive *)d, nullptr };
return dive_or_trip_less_than(d_or_t, entry.d_or_t);
}
void DiveTripModel::divesAdded(dive_trip *trip, bool addTrip, const QVector<dive *> &dives)
@ -1073,8 +1064,8 @@ bool DiveTripModel::lessThan(const QModelIndex &i1, const QModelIndex &i2) const
int row2 = i2.row();
if (row1 < 0 || row1 >= (int)items.size() || row2 < 0 || row2 >= (int)items.size())
return false;
const dive *d1 = items[i1.row()].dives[0];
const dive *d2 = items[i2.row()].dives[0];
const dive *d1 = items[i1.row()].d_or_t.dive;
const dive *d2 = items[i2.row()].d_or_t.dive;
// This is used as a second sort criterion: For equal values, sorting is chronologically *descending*.
int row_diff = row2 - row1;
switch (i1.column()) {

27
qt-models/divetripmodel.h
View file

@ -81,24 +81,15 @@ private slots:
private:
// The model has up to two levels. At the top level, we have either trips or dives
// that do not belong to trips. Such a top-level item is represented by the "Item"
// struct. Two cases two consider:
// 1) If "trip" is non-null, then this is a dive-trip and the dives are collected
// in the dives vector. Note that in principle we could also get the dives in a
// trip from the backend, but there they are collected in a linked-list, which is
// quite inconvenient to access.
// 2) If "trip" is null, this is a dive and dives is supposed to contain exactly
// one element, which is the corresponding dive.
//
// Top-level items are ordered by timestamp. For dives, the core function
// dive_less_than is used, which guarantees a stable ordering even in the
// case of equal timestamps. For dives and trips, place dives before trips
// in the case of an equal timestamp. For trips with equal timestamps, the
// order is currently undefined. This is currently not a problem, because
// the core doesn't have a list of sorted trips. But nevertheless something
// to keep in mind.
// struct, which is based on the dive_or_trip structure.
// If it is a trip, additionally, the dives are collected in a vector.
// The items are ordered chronologically according to the dive_or_trip_less_than()
// function, which guarantees a stable ordering even in the case of equal timestamps.
// For dives and trips, it place dives chronologically after trips, so that in
// the default-descending view they are shown before trips.
struct Item {
dive_trip *trip;
std::vector<dive *> dives; // std::vector<> instead of QVector for insert() with three iterators
dive_or_trip d_or_t;
std::vector<dive *> dives; // std::vector<> instead of QVector for insert() with three iterators
Item(dive_trip *t, const QVector<dive *> &dives);
Item(dive_trip *t, dive *d); // Initialize a trip with one dive
Item(dive *d); // Initialize a top-level dive
@ -126,7 +117,7 @@ private:
void addDivesToTrip(int idx, const QVector<dive *> &dives);
dive *diveOrNull(const QModelIndex &index) const; // Returns a dive if this index represents a dive, null otherwise
QPair<dive_trip *, dive *> tripOrDive(const QModelIndex &index) const;
dive_or_trip tripOrDive(const QModelIndex &index) const;
// Returns either a pointer to a trip or a dive, or twice null of index is invalid
// null, something is really wrong
void setupModelData();