Undo: make adding of weights an undoable action

Introduce an AddWeight undo command. This is modelled after the
numerous dive-edit undo commands. The redo and undo actions are
connected to the WeightModel via two new signals, weightAdded
and weightRemoved.

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

commands/command.cpp

@@ -268,6 +268,11 @@ void editProfile(dive *d)
 	execute(new ReplanDive(d, true));
 }
 
+int addWeight(bool currentDiveOnly)
+{
+	return execute_edit(new AddWeight(currentDiveOnly));
+}
+
 // Trip editing related commands
 void editTripLocation(dive_trip *trip, const QString &s)
 {

commands/command.h

@@ -81,6 +81,7 @@ int editDiveMaster(const QStringList &newList, bool currentDiveOnly);
 void pasteDives(const dive *d, dive_components what);
 void replanDive(dive *d); // dive computer(s) and cylinder(s) will be reset!
 void editProfile(dive *d); // dive computer(s) and cylinder(s) will be reset!
+int addWeight(bool currentDiveOnly);
 
 // 5) Trip editing commands
 

commands/command_edit.cpp

@@ -953,4 +953,36 @@ void ReplanDive::redo()
 	undo();
 }
 
+// ***** Add Weight *****
+AddWeight::AddWeight(bool currentDiveOnly) :
+	EditDivesBase(currentDiveOnly)
+{
+	//: remove the part in parentheses for %n = 1
+	setText(tr("Add weight (%n dive(s))", "", dives.size()));
+}
+
+bool AddWeight::workToBeDone()
+{
+	return true;
+}
+
+void AddWeight::undo()
+{
+	for (dive *d: dives) {
+		if (d->weightsystems.nr <= 0)
+			continue;
+		remove_weightsystem(d, d->weightsystems.nr - 1);
+		emit diveListNotifier.weightRemoved(d, d->weightsystems.nr);
+	}
+}
+
+void AddWeight::redo()
+{
+	weightsystem_t ws { {0}, "" };
+	for (dive *d: dives) {
+		add_cloned_weightsystem(&d->weightsystems, ws);
+		emit diveListNotifier.weightAdded(d, d->weightsystems.nr - 1);
+	}
+}
+
 } // namespace Command

commands/command_edit.h

@@ -330,6 +330,15 @@ private:
 	bool workToBeDone() override;
 };
 
+class AddWeight : public EditDivesBase {
+public:
+	AddWeight(bool currentDiveOnly);
+private:
+	void undo() override;
+	void redo() override;
+	bool workToBeDone() override;
+};
+
 } // namespace Command
 
 #endif