Undo: make "delete dive computer" undoable

Simply reuse the code for "move dive computer" by creating
a DiveComputerBase base class.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

core/dive.c

@@ -4234,10 +4234,22 @@ static void delete_divecomputer(struct dive *d, int num)
 	invalidate_dive_cache(d);
 }
 
-/* always acts on the current dive */
-void delete_current_divecomputer(void)
+/* Clone a dive and delete goven dive computer */
+struct dive *clone_delete_divecomputer(const struct dive *d, int dc_number)
 {
-	delete_divecomputer(current_dive, dc_number);
+	struct dive *res;
+
+	/* copy the dive */
+	res = alloc_dive();
+	copy_dive(d, res);
+
+	/* make a new unique id, since we still can't handle two equal ids */
+	res->id = dive_getUniqID();
+	invalidate_dive_cache(res);
+
+	delete_divecomputer(res, dc_number);
+
+	return res;
 }
 
 /*

core/dive.h

@@ -436,7 +436,7 @@ extern timestamp_t dive_endtime(const struct dive *dive);
 
 extern struct dive *make_first_dc(const struct dive *d, int dc_number);
 extern unsigned int count_divecomputers(void);
-extern void delete_current_divecomputer(void);
+extern struct dive *clone_delete_divecomputer(const struct dive *d, int dc_number);
 void split_divecomputer(const struct dive *src, int num, struct dive **out1, struct dive **out2);
 
 /*

desktop-widgets/command.cpp

@@ -79,6 +79,11 @@ void moveDiveComputerToFront(dive *d, int dc_num)
 	execute(new MoveDiveComputerToFront(d, dc_num));
 }
 
+void deleteDiveComputer(dive *d, int dc_num)
+{
+	execute(new DeleteDiveComputer(d, dc_num));
+}
+
 void mergeDives(const QVector <dive *> &dives)
 {
 	execute(new MergeDives(dives));

desktop-widgets/command.h

@@ -37,6 +37,7 @@ void mergeTrips(dive_trip *trip1, dive_trip *trip2);
 void splitDives(dive *d, duration_t time);
 void splitDiveComputer(dive *d, int dc_num);
 void moveDiveComputerToFront(dive *d, int dc_num);
+void deleteDiveComputer(dive *d, int dc_num);
 void mergeDives(const QVector <dive *> &dives);
 
 // 3) Dive-site related commands

desktop-widgets/command_divelist.cpp

@@ -803,15 +803,12 @@ SplitDiveComputer::SplitDiveComputer(dive *d, int dc_num) : SplitDivesBase(d, sp
 	setText(tr("split dive computer"));
 }
 
-MoveDiveComputerToFront::MoveDiveComputerToFront(dive *d, int dc_num)
+DiveComputerBase::DiveComputerBase(dive *old_dive, dive *new_dive)
 {
-	setText(tr("move dive computer to front"));
-
-	dive *new_dive = make_first_dc(d, dc_num);
 	if (!new_dive)
 		return;
 
-	diveToRemove.dives.push_back(d);
+	diveToRemove.dives.push_back(old_dive);
 
 	// Currently, the core code selects the dive -> this is not what we want, as
 	// we manually manage the selection post-command.
@@ -825,16 +822,16 @@ MoveDiveComputerToFront::MoveDiveComputerToFront(dive *d, int dc_num)
 
 	diveToAdd.dives.resize(1);
 	diveToAdd.dives[0].dive.reset(new_dive);
-	diveToAdd.dives[0].trip = d->divetrip;
-	diveToAdd.dives[0].site = d->dive_site;
+	diveToAdd.dives[0].trip = old_dive->divetrip;
+	diveToAdd.dives[0].site = old_dive->dive_site;
 }
 
-bool MoveDiveComputerToFront::workToBeDone()
+bool DiveComputerBase::workToBeDone()
 {
 	return !diveToRemove.dives.empty() || !diveToAdd.dives.empty();
 }
 
-void MoveDiveComputerToFront::redoit()
+void DiveComputerBase::redoit()
 {
 	DivesAndSitesToRemove addedDive = addDives(diveToAdd);
 	diveToAdd = removeDives(diveToRemove);
@@ -848,12 +845,24 @@ void MoveDiveComputerToFront::redoit()
 	MainWindow::instance()->graphics->replot(current_dive);
 }
 
-void MoveDiveComputerToFront::undoit()
+void DiveComputerBase::undoit()
 {
 	// Undo and redo do the same
 	redoit();
 }
 
+MoveDiveComputerToFront::MoveDiveComputerToFront(dive *d, int dc_num)
+	: DiveComputerBase(d, make_first_dc(d, dc_num))
+{
+	setText(tr("move dive computer to front"));
+}
+
+DeleteDiveComputer::DeleteDiveComputer(dive *d, int dc_num)
+	: DiveComputerBase(d, clone_delete_divecomputer(d, dc_num))
+{
+	setText(tr("delete dive computer"));
+}
+
 MergeDives::MergeDives(const QVector <dive *> &dives)
 {
 	setText(tr("merge dive"));

desktop-widgets/command_divelist.h

@@ -236,23 +236,36 @@ public:
 	SplitDiveComputer(dive *d, int dc_num);
 };
 
-// When moving the dive computer to the front, we go the ineffective,
-// but easy way: We keep two full copies of the dive (before and after).
+// When manipulating dive computers (moving, deleting) we go the ineffective,
+// but simple and robust way: We keep two full copies of the dive (before and after).
 // Removing and readding assures that the dive stays at the correct
 // position in the list (the dive computer list is used for sorting dives).
-class MoveDiveComputerToFront : public DiveListBase {
-public:
-	MoveDiveComputerToFront(dive *d, int dc_num);
+class DiveComputerBase : public DiveListBase {
+protected:
+	// old_dive must be a dive known to the core.
+	// new_dive must be new dive whose ownership is taken.
+	DiveComputerBase(dive *old_dive, dive *new_dive);
 private:
 	void undoit() override;
 	void redoit() override;
 	bool workToBeDone() override;
 
+protected:
 	// For redo and undo
 	DivesAndTripsToAdd	diveToAdd;
 	DivesAndSitesToRemove	diveToRemove;
 };
 
+class MoveDiveComputerToFront : public DiveComputerBase {
+public:
+	MoveDiveComputerToFront(dive *d, int dc_num);
+};
+
+class DeleteDiveComputer : public DiveComputerBase {
+public:
+	DeleteDiveComputer(dive *d, int dc_num);
+};
+
 class MergeDives : public DiveListBase {
 public:
 	MergeDives(const QVector<dive *> &dives);

profile-widget/profilewidget2.cpp

@@ -1575,12 +1575,7 @@ void ProfileWidget2::contextMenuEvent(QContextMenuEvent *event)
 
 void ProfileWidget2::deleteCurrentDC()
 {
-	delete_current_divecomputer();
-	mark_divelist_changed(true);
-	// we need to force it since it's likely the same dive and same dc_number - but that's a different dive computer now
-	plotDive(0, true, false);
-
-	emit refreshDisplay(true);
+	Command::deleteDiveComputer(current_dive, dc_number);
 }
 
 void ProfileWidget2::splitCurrentDC()