: QDialog(parent),

pdb(db),

curIndex(indexName),

index(indexName),

newIndex(createIndex),

ui(new Ui::EditIndexDialog),

m_sRestorePointName(pdb.generateSavepointName("editindex"))

{

// Create UI

ui->setupUi(this);

// Get list of tables, sort it alphabetically and fill the combobox

objectMap dbobjs;

QList<sqlb::ObjectPtr> tables = pdb.objMap.values("table");

for(auto it=tables.constBegin();it!=tables.constEnd();++it)

dbobjs.insert((*it)->name(), (*it));

ui->comboTableName->blockSignals(true);

for(auto it=dbobjs.constBegin();it!=dbobjs.constEnd();++it)

ui->comboTableName->addItem(QIcon(QString(":icons/table")), (*it)->name());

ui->comboTableName->blockSignals(false);

QHeaderView *tableHeaderView = ui->tableIndexColumns->horizontalHeader();

tableHeaderView->setSectionResizeMode(0, QHeaderView::Stretch);

// Editing an existing index?

if(!newIndex)

{

// Load the current layout and fill in the dialog fields

index = *(pdb.getObjectByName(curIndex).dynamicCast<sqlb::Index>());

ui->editIndexName->blockSignals(true);

ui->editIndexName->setText(index.name());

ui->editIndexName->blockSignals(false);

ui->checkIndexUnique->blockSignals(true);

ui->checkIndexUnique->setChecked(index.unique());

ui->checkIndexUnique->blockSignals(false);

ui->comboTableName->blockSignals(true);

ui->comboTableName->setCurrentText(index.table());

ui->comboTableName->blockSignals(false);

ui->editPartialClause->blockSignals(true);

ui->editPartialClause->setText(index.whereExpr());

ui->editPartialClause->blockSignals(false);

tableChanged(index.table(), true);

} else {

tableChanged(ui->comboTableName->currentText(), false);

}

// Add event handler for index column name changes. These are only allowed for expression columns, though.

connect(ui->tableIndexColumns, static_cast<void(QTableWidget::*)(QTableWidgetItem*)>(&QTableWidget::itemChanged),

[=](QTableWidgetItem* item)

{

index.columns().at(item->row())->setName(item->text());

updateSqlText();

});

// Create a savepoint to revert back to

pdb.setSavepoint(m_sRestorePointName);

{

// Set the table name and clear all index columns

if(!initialLoad)

{

index.setTable(new_table);

index.clearColumns();

}

// Stop here if table name is empty

if(new_table.isEmpty())

{

// Call checkInput() before to make sure the OK button is disabled

checkInput();

return;

}

updateColumnLists();

{

// Fill the table column list

sqlb::FieldInfoList tableFields = pdb.getObjectByName(index.table()).dynamicCast<sqlb::Table>()->fieldInformation();

ui->tableTableColumns->setRowCount(tableFields.size());

int tableRows = 0;

for(int i=0;i<tableFields.size();++i)

{

// When we're doing the initial loading and this field already is in the index to edit, then don't add it to the

// list of table columns. It will be added to the list of index columns in the next step. When this is not the initial

// loading, the index column list is empty, so this check will always be true.

if(index.findColumn(tableFields.at(i).name) == -1)

{

// Put the name of the field in the first column

QTableWidgetItem* name = new QTableWidgetItem(tableFields.at(i).name);

name->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);

ui->tableTableColumns->setItem(tableRows, 0, name);

// Put the data type in the second column

QTableWidgetItem* type = new QTableWidgetItem(tableFields.at(i).type);

type->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);

ui->tableTableColumns->setItem(tableRows, 1, type);

tableRows++;

}

}

// Set row count to actual count. This is needed for the intial loading, when some rows might have been omitted because they were used in the index

ui->tableTableColumns->setRowCount(tableRows);

// Fill the index column list. This is done separately from the table column to include expression columns (these are not found in the original

// table) and to preserve the order of the index columns

auto indexFields = index.columns();

ui->tableIndexColumns->blockSignals(true);

ui->tableIndexColumns->setRowCount(indexFields.size());

for(int i=0;i<indexFields.size();++i)

{

// Put the name of the field in the first column

QTableWidgetItem* name = new QTableWidgetItem(indexFields.at(i)->name());

Qt::ItemFlags flags = Qt::ItemIsSelectable | Qt::ItemIsEnabled;

if(indexFields.at(i)->expression())

flags |= Qt::ItemIsEditable;

name->setFlags(flags);

ui->tableIndexColumns->setItem(i, 0, name);

// And put a combobox to select the order in which to index the field in the last column

QComboBox* order = new QComboBox(this);

order->addItem("");

order->addItem("ASC");

order->addItem("DESC");

order->setCurrentText(indexFields.at(i)->order().toUpper());

ui->tableIndexColumns->setCellWidget(i, 1, order);

connect(order, static_cast<void(QComboBox::*)(const QString&)>(&QComboBox::currentTextChanged),

[=](QString new_order)

{

int colnum = index.findColumn(indexFields.at(i)->name());

if(colnum != -1)

{

index.column(colnum)->setOrder(new_order);

updateSqlText();

}

});

}

ui->tableIndexColumns->blockSignals(false);

checkInput();

{

// Get current row number

int row;

if(idx.isValid())

row = idx.row();

else

row = ui->tableTableColumns->currentRow();

// No row selected? Abort.

if(row == -1)

return;

// Add field to index

index.addColumn(sqlb::IndexedColumnPtr(new sqlb::IndexedColumn(

ui->tableTableColumns->item(row, 0)->text(), // Column name

false, // Is expression

""))); // Order

// Update UI

updateColumnLists();

{

// Get current row number

int row;

if(idx.isValid())

row = idx.row();

else

row = ui->tableIndexColumns->currentRow();

// No row selected? Abort.

if(row == -1)

return;

// If this is an expression column and the action was triggered by a double click event instead of a button click,

// we won't remove the expression column because it's too likely that this was only done by accident by the user.

// Instead just open the expression column for editing.

if(index.column(row)->expression() && sender() != ui->buttonFromIndex)

{

ui->tableIndexColumns->editItem(ui->tableIndexColumns->item(row, 0));

return;

}

// Remove column from index

index.removeColumn(ui->tableIndexColumns->item(row, 0)->text());

// Update UI

updateColumnLists();

{

// Check if index name is set

bool valid = true;

if(ui->editIndexName->text().isEmpty())

valid = false;

// Check if index has any columns

if(index.columns().size() == 0)

valid = false;

// Only activate OK button if index data is valid

ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(valid);

// Set the index name and the unique flag

index.setName(ui->editIndexName->text());

index.setUnique(ui->checkIndexUnique->isChecked());

index.setWhereExpr(ui->editPartialClause->text());

updateSqlText();

{

// When editing an index, delete the old one first

if(!newIndex)

{

if(!pdb.executeSQL(QString("DROP INDEX IF EXISTS %1;").arg(sqlb::escapeIdentifier(curIndex))))

{

QMessageBox::warning(this, qApp->applicationName(), tr("Deleting the old index failed:\n%1").arg(pdb.lastError()));

return;

}

}

// Create the new index

if(pdb.executeSQL(index.sql()))

QDialog::accept();

else

QMessageBox::warning(this, QApplication::applicationName(), tr("Creating the index failed:\n%1").arg(pdb.lastError()));

{

// Rollback to our savepoint

pdb.revertToSavepoint(m_sRestorePointName);

QDialog::reject();

{

// Get current row number and calculate row number after the movement. Check the values

int currentRow = ui->tableIndexColumns->currentRow();

if(currentRow == -1)

return;

int newRow = currentRow + (down ? 1 : -1);

if(newRow < 0)

return;

if(newRow >= ui->tableIndexColumns->rowCount())

return;

// Get the column information, swap the columns, and save the new column list back in the index

auto columns = index.columns();

std::swap(columns[currentRow], columns[newRow]);

index.setColumns(columns);

// Update UI

updateColumnLists();

// Select old row at new position

ui->tableIndexColumns->selectRow(newRow);

{

// Check if there already is an empty expression column

int row = index.findColumn("");

if(row == -1)

{

// There is no empty expression column yet, so add one.

// Add new expression column to the index

index.addColumn(sqlb::IndexedColumnPtr(new sqlb::IndexedColumn(

"", // Column name

true, // Is expression

""))); // Order

// Update UI

updateColumnLists();

// Get row number of new column

row = ui->tableIndexColumns->rowCount() - 1;

}

// Now we should have the row number of the empty expression column, no matter if it was newly added or it already existed.

// Select the row for editing

ui->tableIndexColumns->editItem(ui->tableIndexColumns->item(row, 0));