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# connectionwidget.cpp Example File
demos/sqlbrowser/connectionwidget.cpp

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        **
        ** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
        ** this file.  Please review the following information to ensure GNU
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        ** review the following information:
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        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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        #include "connectionwidget.h"

        #include <QtGui>
        #include <QtSql>

        ConnectionWidget::ConnectionWidget(QWidget *parent)
            : QWidget(parent)
        {
            QVBoxLayout *layout = new QVBoxLayout(this);
            tree = new QTreeWidget(this);
            tree->setObjectName(QLatin1String("tree"));
            tree->setHeaderLabels(QStringList(tr("database")));
            tree->header()->setResizeMode(QHeaderView::Stretch);
            QAction *refreshAction = new QAction(tr("Refresh"), tree);
            metaDataAction = new QAction(tr("Show Schema"), tree);
            connect(refreshAction, SIGNAL(triggered()), SLOT(refresh()));
            connect(metaDataAction, SIGNAL(triggered()), SLOT(showMetaData()));
            tree->addAction(refreshAction);
            tree->addAction(metaDataAction);
            tree->setContextMenuPolicy(Qt::ActionsContextMenu);

            layout->addWidget(tree);

            QMetaObject::connectSlotsByName(this);
        }

        ConnectionWidget::~ConnectionWidget()
        {
        }

        static QString qDBCaption(const QSqlDatabase &db)
        {
            QString nm = db.driverName();
            nm.append(QLatin1Char(':'));
            if (!db.userName().isEmpty())
                nm.append(db.userName()).append(QLatin1Char('@'));
            nm.append(db.databaseName());
            return nm;
        }

        void ConnectionWidget::refresh()
        {
            tree->clear();
            QStringList connectionNames = QSqlDatabase::connectionNames();

            bool gotActiveDb = false;
            for (int i = 0; i < connectionNames.count(); ++i) {
                QTreeWidgetItem *root = new QTreeWidgetItem(tree);
                QSqlDatabase db = QSqlDatabase::database(connectionNames.at(i), false);
                root->setText(0, qDBCaption(db));
                if (connectionNames.at(i) == activeDb) {
                    gotActiveDb = true;
                    setActive(root);
                }
                if (db.isOpen()) {
                    QStringList tables = db.tables();
                    for (int t = 0; t < tables.count(); ++t) {
                        QTreeWidgetItem *table = new QTreeWidgetItem(root);
                        table->setText(0, tables.at(t));
                    }
                }
            }
            if (!gotActiveDb) {
                activeDb = connectionNames.value(0);
                setActive(tree->topLevelItem(0));
            }

            tree->doItemsLayout(); // HACK
        }

        QSqlDatabase ConnectionWidget::currentDatabase() const
        {
            return QSqlDatabase::database(activeDb);
        }

        static void qSetBold(QTreeWidgetItem *item, bool bold)
        {
            QFont font = item->font(0);
            font.setBold(bold);
            item->setFont(0, font);
        }

        void ConnectionWidget::setActive(QTreeWidgetItem *item)
        {
            for (int i = 0; i < tree->topLevelItemCount(); ++i) {
                if (tree->topLevelItem(i)->font(0).bold())
                    qSetBold(tree->topLevelItem(i), false);
            }

            if (!item)
                return;

            qSetBold(item, true);
            activeDb = QSqlDatabase::connectionNames().value(tree->indexOfTopLevelItem(item));
        }

        void ConnectionWidget::on_tree_itemActivated(QTreeWidgetItem *item, int /* column */)
        {

            if (!item)
                return;

            if (!item->parent()) {
                setActive(item);
            } else {
                setActive(item->parent());
                emit tableActivated(item->text(0));
            }
        }

        void ConnectionWidget::showMetaData()
        {
            QTreeWidgetItem *cItem = tree->currentItem();
            if (!cItem || !cItem->parent())
                return;
            setActive(cItem->parent());
            emit metaDataRequested(cItem->text(0));
        }

        void ConnectionWidget::on_tree_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *)
        {
            metaDataAction->setEnabled(current && current->parent());
        }