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// SPDX-License-Identifier: GPL-2.0
// The DiveListNotifier emits signals when the dive-list changes (dives/trips/divesites created/deleted/moved/edited)
#ifndef DIVELISTNOTIFIER_H
#define DIVELISTNOTIFIER_H
#include "core/dive.h"
#include <QObject>
// Dive and trip fields that can be edited.
// Use "enum class" to not polute the global name space.
enum class DiveField {
NR,
DATETIME,
DEPTH,
DURATION,
AIR_TEMP,
WATER_TEMP,
ATM_PRESS,
DIVESITE,
DIVEMASTER,
BUDDY,
RATING,
VISIBILITY,
SUIT,
TAGS,
MODE,
NOTES,
SALINITY
};
enum class TripField {
LOCATION,
NOTES
};
class DiveListNotifier : public QObject {
Q_OBJECT
signals:
// Note that there are no signals for trips being added and created
// because these events never happen without a dive being added, removed or moved.
// The dives are always sorted according to the dives_less_than() function of the core.
void divesAdded(dive_trip *trip, bool addTrip, const QVector<dive *> &dives);
void divesDeleted(dive_trip *trip, bool deleteTrip, const QVector<dive *> &dives);
void divesMovedBetweenTrips(dive_trip *from, dive_trip *to, bool deleteFrom, bool createTo, const QVector<dive *> &dives);
void divesChanged(const QVector<dive *> &dives, DiveField field);
void divesTimeChanged(timestamp_t delta, const QVector<dive *> &dives);
void cylindersReset(const QVector<dive *> &dives);
void weightsystemsReset(const QVector<dive *> &dives);
// Trip edited signal
void tripChanged(dive_trip *trip, TripField field);
void divesSelected(const QVector<dive *> &dives, dive *current);
// Dive site signals. Add and delete events are sent per dive site and
// provide an index into the global dive site table.
void diveSiteAdded(dive_site *ds, int idx);
void diveSiteDeleted(dive_site *ds, int idx);
void diveSiteDiveCountChanged(dive_site *ds);
void diveSiteChanged(dive_site *ds, int field); // field according to LocationInformationModel
void diveSiteDivesChanged(dive_site *ds); // The dives associated with that site changed
// This signal is emited every time a command is executed.
// This is used to hide an old multi-dives-edited warning message.
// This is necessary, so that the user can't click on the "undo" button and undo
// an unrelated command.
void commandExecuted();
public:
// Desktop uses the QTreeView class to present the list of dives. The layout
// of this class gives us a very fundamental problem, as we can not easily
// distinguish between user-initiated changes of the selection and changes
// that are due to actions of the Command-classes. To solve this problem,
// the frontend can use this function to query whether a dive list-modifying
// command is currently executed. If this function returns true, the
// frontend is supposed to not modify the selection.
bool inCommand() const;
// The following class and function are used by divelist-modifying commands
// to signal that they are in-flight. If the returned object goes out of scope,
// the command-in-flight status is reset to its previous value. Thus, the
// function can be called recursively.
class InCommandMarker {
DiveListNotifier ¬ifier;
bool oldValue;
InCommandMarker(DiveListNotifier &);
friend DiveListNotifier;
public:
~InCommandMarker();
};
// Usage:
// void doWork()
// {
// auto marker = diveListNotifier.enterCommand();
// ... do work ...
// }
InCommandMarker enterCommand();
private:
friend InCommandMarker;
bool commandExecuting;
};
// The DiveListNotifier class has only trivial state.
// We can simply define it as a global object.
extern DiveListNotifier diveListNotifier;
// InCommandMarker is so trivial that the functions can be inlined.
// TODO: perhaps move this into own header-file.
inline DiveListNotifier::InCommandMarker::InCommandMarker(DiveListNotifier ¬ifierIn) : notifier(notifierIn),
oldValue(notifier.commandExecuting)
{
notifier.commandExecuting = true;
}
inline DiveListNotifier::InCommandMarker::~InCommandMarker()
{
notifier.commandExecuting = oldValue;
}
inline bool DiveListNotifier::inCommand() const
{
return commandExecuting;
}
inline DiveListNotifier::InCommandMarker DiveListNotifier::enterCommand()
{
return InCommandMarker(*this);
}
#endif
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