Undo: implement undo of dive site addition

Implement a dive site addition undo command and connect it to
the add dive site button. The added dive site has a default
name ("new dive site").

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

desktop-widgets/command.cpp

@@ -93,4 +93,9 @@ void editDiveSiteDescription(dive_site *ds, const QString &value)
 	execute(new EditDiveSiteDescription(ds, value));
 }
 
+void addDiveSite(const QString &name)
+{
+	execute(new AddDiveSite(name));
+}
+
 } // namespace Command

desktop-widgets/command.h

@@ -43,6 +43,7 @@ void mergeDives(const QVector <dive *> &dives);
 void deleteDiveSites(const QVector <dive_site *> &sites);
 void editDiveSiteName(dive_site *ds, const QString &value);
 void editDiveSiteDescription(dive_site *ds, const QString &value);
+void addDiveSite(const QString &name);
 
 } // namespace Command
 

desktop-widgets/command_divesite.cpp

@@ -62,6 +62,28 @@ static std::vector<OwningDiveSitePtr> removeDiveSites(std::vector<dive_site *> &
 	return res;
 }
 
+AddDiveSite::AddDiveSite(const QString &name)
+{
+	setText(tr("add dive site"));
+	sitesToAdd.emplace_back(alloc_dive_site());
+	sitesToAdd.back()->name = copy_qstring(name);
+}
+
+bool AddDiveSite::workToBeDone()
+{
+	return true;
+}
+
+void AddDiveSite::redo()
+{
+	sitesToRemove = std::move(addDiveSites(sitesToAdd));
+}
+
+void AddDiveSite::undo()
+{
+	sitesToAdd = std::move(removeDiveSites(sitesToRemove));
+}
+
 DeleteDiveSites::DeleteDiveSites(const QVector<dive_site *> &sites) : sitesToRemove(sites.toStdVector())
 {
 	setText(tr("delete %n dive site(s)", "", sites.size()));

desktop-widgets/command_divesite.h

@@ -11,6 +11,23 @@
 // We put everything in a namespace, so that we can shorten names without polluting the global namespace
 namespace Command {
 
+class AddDiveSite : public Base {
+public:
+	AddDiveSite(const QString &name);
+private:
+	bool workToBeDone() override;
+	void undo() override;
+	void redo() override;
+
+	// Note: we only add one dive site. Nevertheless, we use vectors so that we
+	// can reuse the dive site deletion code.
+	// For redo
+	std::vector<dive_site *> sitesToRemove;
+
+	// For undo
+	std::vector<OwningDiveSitePtr> sitesToAdd;
+};
+
 class DeleteDiveSites : public Base {
 public:
 	DeleteDiveSites(const QVector<dive_site *> &sites);

desktop-widgets/tab-widgets/TabDiveSite.cpp

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include "TabDiveSite.h"
 #include "qt-models/divelocationmodel.h"
+#include "desktop-widgets/command.h"
 
 #include <qt-models/divecomputerextradatamodel.h>
 
@@ -16,6 +17,8 @@ TabDiveSite::TabDiveSite(QWidget *parent) : TabBase(parent)
 	// Show only the first few columns
 	for (int i = LocationInformationModel::COORDS; i < LocationInformationModel::COLUMNS; ++i)
 		ui.diveSites->view()->setColumnHidden(i, true);
+
+	connect(ui.diveSites, &TableView::addButtonClicked, this, &TabDiveSite::add);
 }
 
 void TabDiveSite::updateData()
@@ -25,3 +28,8 @@ void TabDiveSite::updateData()
 void TabDiveSite::clear()
 {
 }
+
+void TabDiveSite::add()
+{
+	Command::addDiveSite(tr("New dive site"));
+}

desktop-widgets/tab-widgets/TabDiveSite.h

@@ -12,6 +12,8 @@ public:
 	TabDiveSite(QWidget *parent = 0);
 	void updateData() override;
 	void clear() override;
+private slots:
+	void add();
 private:
 	Ui::TabDiveSite ui;
 	DiveSiteSortedModel model;