Cut to clipboard operation in data browsers

"Cut" copies the cells to clipboard and then deletes the data taking into
account a possible NOT NULL constraint in the field to leave the cell empty
instead of setting it to NULL. Rowid column is ignored.

See issue #2355

src/ExtendedTableWidget.cpp

@@ -259,6 +259,7 @@ ExtendedTableWidget::ExtendedTableWidget(QWidget* parent) :
     QAction* condFormatAction = new QAction(QIcon(":/icons/edit_cond_formats"), tr("Edit Conditional Formats..."), m_contextMenu);
 
     QAction* nullAction = new QAction(QIcon(":/icons/set_to_null"), tr("Set to NULL"), m_contextMenu);
+    QAction* cutAction = new QAction(QIcon(":/icons/cut"), tr("Cut"), m_contextMenu);
     QAction* copyAction = new QAction(QIcon(":/icons/copy"), tr("Copy"), m_contextMenu);
     QAction* copyWithHeadersAction = new QAction(QIcon(":/icons/special_copy"), tr("Copy with Headers"), m_contextMenu);
     QAction* copyAsSQLAction = new QAction(QIcon(":/icons/sql_copy"), tr("Copy as SQL"), m_contextMenu);
@@ -281,6 +282,7 @@ ExtendedTableWidget::ExtendedTableWidget(QWidget* parent) :
     m_contextMenu->addSeparator();
     m_contextMenu->addAction(nullAction);
     m_contextMenu->addSeparator();
+    m_contextMenu->addAction(cutAction);
     m_contextMenu->addAction(copyAction);
     m_contextMenu->addAction(copyWithHeadersAction);
     m_contextMenu->addAction(copyAsSQLAction);
@@ -296,6 +298,7 @@ ExtendedTableWidget::ExtendedTableWidget(QWidget* parent) :
     // This is only for displaying the shortcut in the context menu.
     // An entry in keyPressEvent is still needed.
     nullAction->setShortcut(QKeySequence(tr("Alt+Del")));
+    cutAction->setShortcut(QKeySequence::Cut);
     copyAction->setShortcut(QKeySequence::Copy);
     copyWithHeadersAction->setShortcut(QKeySequence(tr("Ctrl+Shift+C")));
     copyAsSQLAction->setShortcut(QKeySequence(tr("Ctrl+Alt+C")));
@@ -325,6 +328,7 @@ ExtendedTableWidget::ExtendedTableWidget(QWidget* parent) :
         // Try to find out whether the current view is editable and (de)activate menu options according to that
         bool editable = editTriggers() != QAbstractItemView::NoEditTriggers;
         nullAction->setEnabled(enabled && editable);
+        cutAction->setEnabled(enabled && editable);
         pasteAction->setEnabled(enabled && editable);
 
         // Show menu
@@ -371,6 +375,7 @@ ExtendedTableWidget::ExtendedTableWidget(QWidget* parent) :
     connect(copyAction, &QAction::triggered, [&]() {
        copy(false, false);
     });
+    connect(cutAction, &QAction::triggered, this, &ExtendedTableWidget::cut);
     connect(copyWithHeadersAction, &QAction::triggered, [&]() {
        copy(true, false);
     });
@@ -719,6 +724,30 @@ void ExtendedTableWidget::paste()
     }
 }
 
+void ExtendedTableWidget::cut()
+{
+    const QModelIndexList& indices = selectionModel()->selectedIndexes();
+    SqliteTableModel* m = qobject_cast<SqliteTableModel*>(model());
+    sqlb::TablePtr currentTable = m->db().getObjectByName<sqlb::Table>(m->currentTableName());
+
+    copy(false, false);
+
+    // Check if the column in the selection has a NOT NULL constraint, then update with an empty string, else with NULL
+    if(currentTable) {
+        for(const QModelIndex& index : indices) {
+            // Do not process rowid column
+            if(index.column() != 0) {
+                size_t indexField = static_cast<size_t>(index.column()-1);
+                const sqlb::Field& field = currentTable->fields.at(indexField);
+                const QVariant newValue = field.notnull() ? QVariant("") : QVariant();
+                // Update aborting in case of any error (to avoid repetitive errors like "Database is locked"
+                if(!model()->setData(index, newValue))
+                    return;
+            }
+        }
+    }
+}
+
 void ExtendedTableWidget::useAsFilter(const QString& filterOperator, bool binary, const QString& operatorSuffix)
 {
     QModelIndex index = selectionModel()->currentIndex();
@@ -776,6 +805,9 @@ void ExtendedTableWidget::keyPressEvent(QKeyEvent* event)
     {
         copy(false, false);
         return;
+    } else if(event->matches(QKeySequence::Cut)) {
+        // Call a custom cut method when Ctrl-X is pressed
+        cut();
     } else if(event->matches(QKeySequence::Paste)) {
         // Call a custom paste method when Ctrl-V is pressed
         paste();

src/ExtendedTableWidget.h

@@ -81,6 +81,7 @@ private:
     void copyMimeData(const QModelIndexList& fromIndices, QMimeData* mimeData, const bool withHeaders, const bool inSQL);
     void copy(const bool withHeaders, const bool inSQL);
     void paste();
+    void cut();
 
     void useAsFilter(const QString& filterOperator, bool binary = false, const QString& operatorSuffix = QString());
     void duplicateUpperCell();

src/icons/icons.qrc

@@ -103,5 +103,6 @@
         <file alias="open_data_in_app">application_go.png</file>
         <file>monitor_link.png</file>
         <file alias="clone_database">server_add.png</file>
+        <file alias="cut">cut.png</file>
     </qresource>
 </RCC>