browser.h Example File

  /****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the demonstration applications of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** "Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/

  #ifndef BROWSER_H
  #define BROWSER_H

  #include <QWidget>
  #include <QSqlTableModel>
  #include "ui_browserwidget.h"

  class ConnectionWidget;
  QT_FORWARD_DECLARE_CLASS(QTableView)
  QT_FORWARD_DECLARE_CLASS(QPushButton)
  QT_FORWARD_DECLARE_CLASS(QTextEdit)
  QT_FORWARD_DECLARE_CLASS(QSqlError)

  class Browser: public QWidget, private Ui::Browser
  {
      Q_OBJECT
  public:
      Browser(QWidget *parent = nullptr);
      virtual ~Browser();

      QSqlError addConnection(const QString &driver, const QString &dbName, const QString &host,
                    const QString &user, const QString &passwd, int port = -1);

      void insertRow();
      void deleteRow();
      void updateActions();

  public slots:
      void exec();
      void showTable(const QString &table);
      void showMetaData(const QString &table);
      void addConnection();
      void currentChanged() { updateActions(); }
      void about();

      void on_insertRowAction_triggered()
      { insertRow(); }
      void on_deleteRowAction_triggered()
      { deleteRow(); }
      void on_fieldStrategyAction_triggered();
      void on_rowStrategyAction_triggered();
      void on_manualStrategyAction_triggered();
      void on_submitAction_triggered();
      void on_revertAction_triggered();
      void on_selectAction_triggered();
      void on_connectionWidget_tableActivated(const QString &table)
      { showTable(table); }
      void on_connectionWidget_metaDataRequested(const QString &table)
      { showMetaData(table); }
      void on_submitButton_clicked()
      {
          exec();
          sqlEdit->setFocus();
      }
      void on_clearButton_clicked()
      {
          sqlEdit->clear();
          sqlEdit->setFocus();
      }

  signals:
      void statusMessage(const QString &message);
  };

  class CustomModel: public QSqlTableModel
  {
      Q_OBJECT
  public:
      explicit CustomModel(QObject *parent = nullptr, QSqlDatabase db = QSqlDatabase())
          : QSqlTableModel(parent, db) {}

      QVariant data(const QModelIndex &idx, int role) const override
      {
          if (role == Qt::BackgroundRole && isDirty(idx))
              return QBrush(QColor(Qt::yellow));
          return QSqlTableModel::data(idx, role);
      }
  };

  #endif