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// SPDX-License-Identifier: GPL-2.0
#ifndef DIVETRIPMODEL_H
#define DIVETRIPMODEL_H
#include "core/dive.h"
#include <QAbstractItemModel>
// There are two different representations of the dive list:
// 1) Tree view: two-level model where dives are grouped by trips
// 2) List view: one-level model where dives are sorted by one out
// of many keys (e.g. date, depth, etc.).
//
// These two representations are realized by two classe, viz.
// DiveTripModelTree and DiveTripModelList. Both classes derive
// from DiveTripModelBase, which implements common features (e.g.
// definition of the column types, access of data from the core
// structures) and a common interface.
//
// The currently active model is set via DiveTripModelBase::resetModel().
// This will create a new model. The model can be accessed with
// DiveTripModelBase::instance(). Any pointer obtained by instance()
// is invalid after a call to resetModel()! Yes, this is surprising
// behavior, so care must be taken.
class DiveTripModelBase : public QAbstractItemModel {
Q_OBJECT
public:
enum Column {
NR,
DATE,
RATING,
DEPTH,
DURATION,
TEMPERATURE,
TOTALWEIGHT,
SUIT,
CYLINDER,
GAS,
SAC,
OTU,
MAXCNS,
TAGS,
PHOTOS,
BUDDIES,
COUNTRY,
LOCATION,
COLUMNS
};
enum ExtraRoles {
STAR_ROLE = Qt::UserRole + 1,
DIVE_ROLE,
TRIP_ROLE,
DIVE_IDX,
SELECTED_ROLE
};
enum Layout {
TREE,
LIST,
};
// Functions implemented by base class
static DiveTripModelBase *instance();
// Reset the model using the given layout. After this call instance() will return
// a newly allocated object and the old model will have been destroyed! Thus, the
// caller is repsonsible of removing all references to any previous model obtained
// by insance().
static void resetModel(Layout layout);
Qt::ItemFlags flags(const QModelIndex &index) const;
QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override;
DiveTripModelBase(QObject *parent = 0);
int columnCount(const QModelIndex&) const;
virtual void filterFinished() = 0;
// Used for sorting. This is a bit of a layering violation, as sorting should be performed
// by the higher-up QSortFilterProxyModel, but it makes things so much easier!
virtual bool lessThan(const QModelIndex &i1, const QModelIndex &i2) const = 0;
signals:
// The propagation of selection changes is complex.
// The control flow of dive-selection goes:
// Commands/DiveListNotifier ---(dive */dive_trip *)---> DiveTripModel ---(QModelIndex)---> DiveListView
// i.e. The command objects send changes in terms of pointer-to-dives, which the DiveTripModel transforms
// into QModelIndexes according to the current view (tree/list). Finally, the DiveListView transforms these
// indexes into local indexes according to current sorting/filtering and instructs the QSelectionModel to
// perform the appropriate actions.
void selectionChanged(const QVector<QModelIndex> &indexes, bool select);
void newCurrentDive(QModelIndex index);
protected slots:
void divesSelected(dive_trip *trip, const QVector<dive *> &dives);
void divesDeselected(dive_trip *trip, const QVector<dive *> &dives);
protected:
// Access trip and dive data
static QVariant diveData(const struct dive *d, int column, int role);
static QVariant tripData(const dive_trip *trip, int column, int role);
// Select or deselect dives
virtual void changeDiveSelection(dive_trip *trip, const QVector<dive *> &dives, bool select) = 0;
virtual dive *diveOrNull(const QModelIndex &index) const = 0; // Returns a dive if this index represents a dive, null otherwise
};
class DiveTripModelTree : public DiveTripModelBase
{
Q_OBJECT
public slots:
void divesAdded(dive_trip *trip, bool addTrip, const QVector<dive *> &dives);
void divesDeleted(dive_trip *trip, bool deleteTrip, const QVector<dive *> &dives);
void divesChanged(dive_trip *trip, const QVector<dive *> &dives);
void divesTimeChanged(dive_trip *trip, timestamp_t delta, const QVector<dive *> &dives);
void divesMovedBetweenTrips(dive_trip *from, dive_trip *to, bool deleteFrom, bool createTo, const QVector<dive *> &dives);
void currentDiveChanged();
public:
DiveTripModelTree(QObject *parent = nullptr);
private:
int rowCount(const QModelIndex &parent) const override;
QModelIndex index(int row, int column, const QModelIndex &parent) const override;
QModelIndex parent(const QModelIndex &index) const override;
QVariant data(const QModelIndex &index, int role) const override;
void filterFinished() override;
bool lessThan(const QModelIndex &i1, const QModelIndex &i2) const override;
void changeDiveSelection(dive_trip *trip, const QVector<dive *> &dives, bool select) override;
dive *diveOrNull(const QModelIndex &index) const override;
// The tree model has 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, 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_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
bool isDive(const dive *) const; // Helper function: is this the give dive?
dive *getDive() const; // Helper function: returns top-level-dive or null
timestamp_t when() const; // Helper function: start time of dive *or* trip
};
std::vector<Item> items; // Use std::vector for convenience of emplace_back()
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
// Addition and deletion of dives
void addDivesToTrip(int idx, const QVector<dive *> &dives);
void topLevelChanged(int idx);
// Access trips and dives
int findTripIdx(const dive_trip *trip) const;
int findDiveIdx(const dive *d) const; // Find _top_level_ dive
int findDiveInTrip(int tripIdx, const dive *d) const; // Find dive inside trip. Second parameter is index of trip
int findInsertionIndex(const dive_trip *trip) const; // Where to insert trip
// Comparison function between dive and arbitrary entry
static bool dive_before_entry(const dive *d, const Item &entry);
};
class DiveTripModelList : public DiveTripModelBase
{
Q_OBJECT
public slots:
void divesAdded(dive_trip *trip, bool addTrip, const QVector<dive *> &dives);
void divesDeleted(dive_trip *trip, bool deleteTrip, const QVector<dive *> &dives);
void divesChanged(dive_trip *trip, const QVector<dive *> &dives);
void divesTimeChanged(dive_trip *trip, timestamp_t delta, const QVector<dive *> &dives);
// Does nothing in list view.
//void divesMovedBetweenTrips(dive_trip *from, dive_trip *to, bool deleteFrom, bool createTo, const QVector<dive *> &dives);
void currentDiveChanged();
public:
DiveTripModelList(QObject *parent = nullptr);
private:
int rowCount(const QModelIndex &parent) const override;
QModelIndex index(int row, int column, const QModelIndex &parent) const override;
QModelIndex parent(const QModelIndex &index) const override;
QVariant data(const QModelIndex &index, int role) const override;
void filterFinished() override;
bool lessThan(const QModelIndex &i1, const QModelIndex &i2) const override;
void changeDiveSelection(dive_trip *trip, const QVector<dive *> &dives, bool select) override;
dive *diveOrNull(const QModelIndex &index) const override;
std::vector<dive *> items; // TODO: access core data directly
};
#endif
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