Undo: Implement undo of dive site name editing

Implement an undo command that edits the name of a dive site.
Connect it to the dive site table, so that names can be edited
directly in the table.

Send signals on undo / redo so that the dive site table and
the dive site edit widget can be updated.

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

desktop-widgets/command.cpp

@@ -83,4 +83,9 @@ void deleteDiveSites(const QVector <dive_site *> &sites)
 	execute(new DeleteDiveSites(sites));
 }
 
+void editDiveSiteName(dive_site *ds, const QString &value)
+{
+	execute(new EditDiveSiteName(ds, value));
+}
+
 } // namespace Command

desktop-widgets/command.h

@@ -41,6 +41,7 @@ void mergeDives(const QVector <dive *> &dives);
 // 3) Dive-site related commands
 
 void deleteDiveSites(const QVector <dive_site *> &sites);
+void editDiveSiteName(dive_site *ds, const QString &value);
 
 } // namespace Command
 

desktop-widgets/command_divesite.cpp

@@ -3,6 +3,8 @@
 #include "command_divesite.h"
 #include "core/divesite.h"
 #include "core/subsurface-qt/DiveListNotifier.h"
+#include "core/qthelper.h"
+#include "qt-models/divelocationmodel.h"
 
 namespace Command {
 
@@ -80,4 +82,29 @@ void DeleteDiveSites::undo()
 	sitesToRemove = std::move(addDiveSites(sitesToAdd));
 }
 
+EditDiveSiteName::EditDiveSiteName(dive_site *dsIn, const QString &name) : ds(dsIn),
+	value(name)
+{
+}
+
+bool EditDiveSiteName::workToBeDone()
+{
+	return value != QString(ds->name);
+}
+
+void EditDiveSiteName::redo()
+{
+	QString s = ds->name;
+	free(ds->name);
+	ds->name = copy_qstring(value);
+	value = s;
+	emit diveListNotifier.diveSiteChanged(ds, LocationInformationModel::NAME); // Inform frontend of changed dive site.
+}
+
+void EditDiveSiteName::undo()
+{
+	// Undo and redo do the same
+	redo();
+}
+
 } // namespace Command

desktop-widgets/command_divesite.h

@@ -16,14 +16,26 @@ public:
 	DeleteDiveSites(const QVector<dive_site *> &sites);
 private:
 	bool workToBeDone() override;
+	void undo() override;
+	void redo() override;
 
 	// For redo
 	std::vector<dive_site *> sitesToRemove;
 
 	// For undo
 	std::vector<OwningDiveSitePtr> sitesToAdd;
+};
+
+class EditDiveSiteName : public Base {
+public:
+	EditDiveSiteName(dive_site *ds, const QString &name);
+private:
+	bool workToBeDone() override;
 	void undo() override;
 	void redo() override;
+
+	dive_site *ds;
+	QString value; // Value to be set
 };
 
 } // namespace Command

desktop-widgets/locationinformation.cpp

@@ -8,6 +8,7 @@
 #include "qt-models/filtermodels.h"
 #include "core/divesitehelpers.h"
 #include "desktop-widgets/modeldelegates.h"
+#include "core/subsurface-qt/DiveListNotifier.h"
 
 #include <QDebug>
 #include <QShowEvent>
@@ -38,6 +39,8 @@ LocationInformationWidget::LocationInformationWidget(QWidget *parent) : QGroupBo
 	connect(ui.diveSiteCoordinates, SIGNAL(returnPressed()), this, SLOT(updateLocationOnMap()));
 	ui.diveSiteCoordinates->installEventFilter(this);
 
+	connect(&diveListNotifier, &DiveListNotifier::diveSiteChanged, this, &LocationInformationWidget::diveSiteChanged);
+
 	ui.diveSiteListView->setModel(&filter_model);
 	ui.diveSiteListView->setModelColumn(LocationInformationModel::NAME);
 	ui.diveSiteListView->installEventFilter(this);
@@ -121,6 +124,18 @@ void LocationInformationWidget::updateLabels()
 	ui.locationTags->setText(constructLocationTags(&taxonomy, false));
 }
 
+void LocationInformationWidget::diveSiteChanged(struct dive_site *ds, int field)
+{
+	if (diveSite != ds)
+		return; // A different dive site was changed -> do nothing.
+	switch (field) {
+	case LocationInformationModel::NAME:
+		ui.diveSiteName->setText(diveSite->name);
+	default:
+		return;
+	}
+}
+
 void LocationInformationWidget::clearLabels()
 {
 	ui.diveSiteName->clear();

desktop-widgets/locationinformation.h

@@ -39,6 +39,7 @@ public slots:
 private slots:
 	void updateLabels();
 	void updateLocationOnMap();
+	void diveSiteChanged(struct dive_site *ds, int field);
 signals:
 	void endEditDiveSite();
 	void nameChanged(const QString &oldName, const QString &newName);