Deleting items from the model can now be made undone/redone.

CMakeLists.txt

@@ -26,6 +26,7 @@ add_library(${TARGET_APP} STATIC
   model/modelitem.h model/modelitem.cpp
   formats/jsonparser.h formats/jsonparser.cpp
   model/commands/insertrowscommand.h model/commands/insertrowscommand.cpp
+  model/commands/removerowscommand.h model/commands/removerowscommand.cpp
 )
 
 include_directories(${CMAKE_CURRENT_BINARY_DIR})

model/commands/removerowscommand.cpp

@@ -0,0 +1,47 @@
+#include "removerowscommand.h"
+
+#include <QDebug>
+
+#include "../tablemodel.h"
+
+RemoveRowsCommand::RemoveRowsCommand(TableModel* model,
+                                     const int startRow,
+                                     const int nRows,
+                                     QUndoCommand* parent)
+    : QUndoCommand(parent)
+    , m_tableModel(model)
+    , m_startRow(startRow) {
+  qInfo() << "New RemoveCommand...";
+  const QString commandText =
+      QString("removing %1 item(s) on position %2").arg(nRows).arg(startRow);
+  setText(commandText);
+
+  for (int row = 0; row < nRows; ++row) {
+    const int rowPosition = startRow + row;
+    QModelIndex index     = m_tableModel->index(rowPosition, 0);
+
+    // TODO use a (static) function "getRoleValueHash" or something
+    QHash<int, QVariant> values;
+    values[TableModel::NameRole]        = m_tableModel->data(index, TableModel::NameRole);
+    values[TableModel::DescriptionRole] = m_tableModel->data(index, TableModel::DescriptionRole);
+    values[TableModel::InfoRole]        = m_tableModel->data(index, TableModel::InfoRole);
+    values[TableModel::AmountRole]      = m_tableModel->data(index, TableModel::AmountRole);
+    values[TableModel::FactorRole]      = m_tableModel->data(index, TableModel::FactorRole);
+
+    m_valueList.append(values);
+  }
+}
+
+void RemoveRowsCommand::undo() {
+  qDebug() << "Undoing the RemoveCommand...";
+  if (m_tableModel) {
+    m_tableModel->execInsertItems(m_startRow, m_valueList);
+  }
+}
+
+void RemoveRowsCommand::redo() {
+  qDebug() << "(Re-)doing the RemoveCommand...";
+  if (m_tableModel) {
+    m_tableModel->execRemoveItems(m_startRow, m_valueList.length());
+  }
+}

model/commands/removerowscommand.h

@@ -0,0 +1,28 @@
+#ifndef REMOVEROWSCOMMAND_H
+#define REMOVEROWSCOMMAND_H
+
+#include <QUndoCommand>
+
+class TableModel;
+
+class RemoveRowsCommand : public QUndoCommand {
+ public:
+  // TODO don't use simple pointer to model
+  /// Using simple pointer to model because there was a crash when closing the application with an
+  /// unclean undo stack
+  RemoveRowsCommand(TableModel* model,
+                    const int startRow,
+                    const int nRows,
+                    QUndoCommand* parent = nullptr);
+
+  /// QUndoCommand interface
+  void undo() override;
+  void redo() override;
+
+ private:
+  TableModel* m_tableModel;
+  const int m_startRow;
+  QList<QHash<int, QVariant>> m_valueList;
+};
+
+#endif  // REMOVEROWSCOMMAND_H

model/tablemodel.cpp

@@ -2,6 +2,7 @@
 
 #include "../formats/jsonparser.h"
 #include "commands/insertrowscommand.h"
+#include "commands/removerowscommand.h"
 #include "modelitem.h"
 
 QHash<int, QByteArray> TableModel::ROLE_NAMES = {{NameRole, "Name"},
@@ -108,9 +109,8 @@ bool TableModel::removeRows(int firstRow, int nRows, const QModelIndex& parentIn
     return false;
   }
 
-  beginRemoveRows(QModelIndex(), firstRow, lastRow);
-  m_items.remove(firstRow, nRows);
-  endRemoveRows();
+  RemoveRowsCommand* removeCommand = new RemoveRowsCommand(this, firstRow, nRows);
+  m_undoStack->push(removeCommand);
 
   return true;
 }

model/tablemodel.h

@@ -12,6 +12,7 @@ class TableModel : public QAbstractTableModel {
   Q_OBJECT
 
   friend class InsertRowsCommand;
+  friend class RemoveRowsCommand;
 
  public:
   enum UserRoles { NameRole = Qt::UserRole + 1, DescriptionRole, InfoRole, AmountRole, FactorRole };