Undo: implement rudimentary support for undo of dive-splitting

For this, the core functionality of the split_dive() and
split_dive_at_time() functions were split out into new
split_dive_dont_insert() and split_dive_at_time_dont_insert(),
which do not add the new dives to the log. Thus, the undo-command
can take ownership of these dives, without having to remove them
first.

The split-dive functionality is temporarily made desktop-only
until mobile also supports "UndoObjects".

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

1 files changed, 19 insertions, 0 deletions

diff --git a/desktop-widgets/undocommands.h b/desktop-widgets/undocommands.h
index 4c4073454..c30ae5fae 100644
--- a/desktop-widgets/undocommands.h
+++ b/desktop-widgets/undocommands.h
@@ -227,4 +227,23 @@ private:
 	std::vector<OwningTripPtr> tripsToAdd;
 };
 
+class UndoSplitDives : public QUndoCommand {
+public:
+	// If time is < 0, split at first surface interval
+	UndoSplitDives(dive *d, duration_t time);
+private:
+	void undo() override;
+	void redo() override;
+
+	// For redo
+	// For each dive to split, we remove one from and put two dives into the backend
+	dive		*diveToSplit;
+	DiveToAdd	 splitDives[2];
+
+	// For undo
+	// For each dive to unsplit, we remove two dives from and add one into the backend
+	DiveToAdd	 unsplitDive;
+	dive		*divesToUnsplit[2];
+};
+
 #endif // UNDOCOMMANDS_H