Undo: make weight editing undoable

Implement the EditWeight undo command. Since there is common code
(storage of the old weight), this creates a common base class for
RemoveWeight and EditWeight. The model calls directly into the undo
command, which is somewhat unfortunate as it feels like a layering
violation. It's the easy thing to do for now.

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

commands/command.cpp

@@ -278,6 +278,11 @@ int removeWeight(int index, bool currentDiveOnly)
 	return execute_edit(new RemoveWeight(index, currentDiveOnly));
 }
 
+int editWeight(int index, weightsystem_t ws, bool currentDiveOnly)
+{
+	return execute_edit(new EditWeight(index, ws, currentDiveOnly));
+}
+
 // Trip editing related commands
 void editTripLocation(dive_trip *trip, const QString &s)
 {

commands/command.h

@@ -83,6 +83,7 @@ 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);
 int removeWeight(int index, bool currentDiveOnly);
+int editWeight(int index, weightsystem_t ws, bool currentDiveOnly);
 
 // 5) Trip editing commands
 

commands/command_edit.cpp

@@ -6,6 +6,7 @@
 #include "core/selection.h"
 #include "core/subsurface-string.h"
 #include "core/tag.h"
+#include "qt-models/weightsysteminfomodel.h"
 
 namespace Command {
 
@@ -993,7 +994,7 @@ static int find_weightsystem_index(const struct dive *d, weightsystem_t ws)
 	return -1;
 }
 
-RemoveWeight::RemoveWeight(int index, bool currentDiveOnly) :
+EditWeightBase::EditWeightBase(int index, bool currentDiveOnly) :
 	EditDivesBase(currentDiveOnly),
 	ws(empty_weightsystem)
 {
@@ -1024,21 +1025,25 @@ RemoveWeight::RemoveWeight(int index, bool currentDiveOnly) :
 		}
 	}
 	dives = std::move(divesNew);
-
-	//: remove the part in parentheses for %n = 1
-	setText(tr("Remove weight (%n dive(s))", "", dives.size()));
 }
 
-RemoveWeight::~RemoveWeight()
+EditWeightBase::~EditWeightBase()
 {
 	free_weightsystem(ws);
 }
 
-bool RemoveWeight::workToBeDone()
+bool EditWeightBase::workToBeDone()
 {
 	return !dives.empty();
 }
 
+RemoveWeight::RemoveWeight(int index, bool currentDiveOnly) :
+	EditWeightBase(index, currentDiveOnly)
+{
+	//: remove the part in parentheses for %n = 1
+	setText(tr("Remove weight (%n dive(s))", "", dives.size()));
+}
+
 void RemoveWeight::undo()
 {
 	for (size_t i = 0; i < dives.size(); ++i) {
@@ -1055,4 +1060,57 @@ void RemoveWeight::redo()
 	}
 }
 
+EditWeight::EditWeight(int index, weightsystem_t wsIn, bool currentDiveOnly) :
+	EditWeightBase(index, currentDiveOnly),
+	new_ws(empty_weightsystem)
+{
+	if (dives.empty())
+		return;
+
+	//: remove the part in parentheses for %n = 1
+	setText(tr("Edit weight (%n dive(s))", "", dives.size()));
+
+	// Try to untranslate the weightsystem name
+	new_ws = clone_weightsystem(wsIn);
+	QString vString(new_ws.description);
+	for (int i = 0; i < MAX_WS_INFO && ws_info[i].name; ++i) {
+		if (gettextFromC::tr(ws_info[i].name) == vString) {
+			free_weightsystem(new_ws);
+			new_ws.description = copy_string(ws_info[i].name);
+			break;
+		}
+	}
+
+	// If that doesn't change anything, do nothing
+	if (same_weightsystem(ws, new_ws)) {
+		dives.clear();
+		return;
+	}
+
+	WSInfoModel *wsim = WSInfoModel::instance();
+	QModelIndexList matches = wsim->match(wsim->index(0, 0), Qt::DisplayRole, gettextFromC::tr(new_ws.description));
+	if (!matches.isEmpty())
+		wsim->setData(wsim->index(matches.first().row(), WSInfoModel::GR), new_ws.weight.grams);
+}
+
+EditWeight::~EditWeight()
+{
+	free_weightsystem(new_ws);
+}
+
+void EditWeight::redo()
+{
+	for (size_t i = 0; i < dives.size(); ++i) {
+		set_weightsystem(dives[i], indexes[i], new_ws);
+		emit diveListNotifier.weightEdited(dives[i], indexes[i]);
+	}
+	std::swap(ws, new_ws);
+}
+
+// Undo and redo do the same as just the stored value is exchanged
+void EditWeight::undo()
+{
+	redo();
+}
+
 } // namespace Command

commands/command_edit.h

@@ -339,16 +339,32 @@ private:
 	bool workToBeDone() override;
 };
 
-class RemoveWeight : public EditDivesBase {
-public:
-	RemoveWeight(int index, bool currentDiveOnly);
-	~RemoveWeight();
-private:
+class EditWeightBase : public EditDivesBase {
+protected:
+	EditWeightBase(int index, bool currentDiveOnly);
+	~EditWeightBase();
+
 	weightsystem_t ws;
 	std::vector<int> indexes; // An index for each dive in the dives vector.
+	bool workToBeDone() override;
+};
+
+class RemoveWeight : public EditWeightBase {
+public:
+	RemoveWeight(int index, bool currentDiveOnly);
+private:
+	void undo() override;
+	void redo() override;
+};
+
+class EditWeight : public EditWeightBase {
+public:
+	EditWeight(int index, weightsystem_t ws, bool currentDiveOnly); // Clones ws
+	~EditWeight();
+private:
+	weightsystem_t new_ws;
 	void undo() override;
 	void redo() override;
-	bool workToBeDone() override;
 };
 
 } // namespace Command