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openPilotLog
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<div class="title">Project Overview </div>  </div>
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<h1><a class="anchor" id="autotoc_md0"></a>
Technical Overview</h1>
<ul>
<li>Framework: Qt5 (C++)</li>
<li>Database: sqlite3</li>
</ul>
<p>This program is suppposed to replace a paper logbook with an electronic version. As a first step, I want to focus on the basics, and then add 'nice-to-haves' later. These are the guidelines for this project:</p>
<ul>
<li>Speed: openPilotLog is supposed to be fast, lean and efficient. I have settled on using the Qt framework for the gui and code, as well as sqlite for the database.</li>
<li>Cross-Platform Support: Linux, Windows and Mac (and maybe down the road iOS/Android) should be supported. Qt provides this cross-platform compatibility.</li>
<li>Local: At the moment, I am not planning on implementing a cloud-sync solution. The database is local, on your machine, and moving it around should be as easy as copying it onto a USB stick. While I am not opposed to cloud syncing functionality, I want the application to be independent of external services.</li>
<li>Free: This application is and always will be free to use, distribute and modify. I have used commercial solutions before and have been disappointed when a 'lifetime' license expired because the company needs to support their development and cloud infrastructure. That's fair enough, but I believe keeping a logbook of your flights is not rocket science and you should not have to pay a monthly subscription for that.</li>
<li>This is an open source project. Feel free to copy, modify or distritbute it under the GPL v3.</li>
</ul>
<h1><a class="anchor" id="autotoc_md1"></a>
Compiling the project</h1>
<p>The most straight forward way is to get a copy of <a href="https://www.qt.io/download">Qt</a> and compile the project using either cmake or QtCreator and qmake. The <code>CMakeList.txt</code> and <code>.pro</code> files are included in the repository. CMake is recommended and will be the standard going forward.</p>
<p>On first launch, you will run through a setup wizard for the database. If you want to test the program with a sample database, use the <code>Backup</code> functionality. Select <code>Restore external backup</code> from the GUI and import the file <code>logbook.db</code> from the assets folder in the repository.</p>
<h2><a class="anchor" id="autotoc_md2"></a>
Known issues</h2>
<ul>
<li>The setup wizard for the database requires openSSL to download the most recent data. In order for this to work on Windows, you need to place the <a href="https://wiki.openssl.org/index.php/Binaries">openSSL dll's</a> in the application directory. On Linux, this is normally not an issue. If you are running into problems there, try installing the <code>openssl-dev</code> package or similar from your distribution's package manager.</li>
<li>When compiling with CMake, instead of updating the translations, there is a bug that might instead delete them. See <a href="https://bugreports.qt.io/browse/QTBUG-41736">here</a> and <a href="https://bugreports.qt.io/browse/QTBUG-76410">here</a>. Long story short, make sure to use a version of CMake that is 3.16 or earlier, or 3.19.2 or later if you want to use localisations other than English (once they're implemented).</li>
</ul>
<h1><a class="anchor" id="autotoc_md3"></a>
Implementation Overview</h1>
<p>Keeping a logbook of flights is a quintessential database task. This program could thus be seen as a user-friendly front-end to a database. The database is a sqlite3-Database, which is described in detail on the <a href="https://github.com/fiffty-50/openpilotlog/wiki/Database-Layout-and-Description">Database</a> Wiki Page.</p>
<p>Access to the database is provided by the <a class="el" href="class_a_database.html" title="The DB class encapsulates the SQL database by providing fast access to hot database data.">ADatabase</a> Class, which is responsible for managing the database connection and creating and executing queries. Data is retreived from the database in form of <a class="el" href="class_a_entry.html" title="The Entry class encapsulates table metadata(table name, row id) and data for new and existing entries...">AEntry</a> objects. The <a class="el" href="class_a_entry.html" title="The Entry class encapsulates table metadata(table name, row id) and data for new and existing entries...">AEntry</a> class and its subclasses represent 'lines' in a database table. Internally, they are structs holding a <a href="https://doc.qt.io/qt-5/qmap.html">QMap&lt;QVariant, QVariant&gt;</a> with the key being the column name and the value its value. These Objects are then parsed by the different widgets and dialogues to read or write user-provided data.</p>
<p>The database contents are displayed to the user in the different widgets. <b>Flights</b> are displayed in the <a class="el" href="class_logbook_widget.html" title="The LogbookWidget displays data from the database in a QSqlTableView fed by a QSqlQuery Model.">LogbookWidget</a>, <b>Pilots</b> in the <a class="el" href="class_pilots_widget.html" title="The PilotsWidget is used to view, edit, delete or add new pilots.">PilotsWidget</a> and <b>Aircraft</b> in the <a class="el" href="class_aircraft_widget.html" title="The AircraftWidget is used to view, edit, delete or add new tails.">AircraftWidget</a>. These widgets also give convenient access to the Dialogues (<a class="el" href="class_new_flight_dialog.html">NewFlightDialog</a>, <a class="el" href="class_new_pilot_dialog.html">NewPilotDialog</a>, <a class="el" href="class_new_tail_dialog.html" title="The NewTail class is a dialog for adding a new tail to the database or editing an existing one.">NewTailDialog</a>), enabling editing, adding or removing entries of their respective categories.</p>
<p>Widget class Elements of the User Interface dispay data from the database in a <a href="https://doc.qt.io/qt-5/qtableview.html">QTableView</a> with a <a href="https://doc.qt.io/qt-5.12/qsqlquerymodel.html">QSqlQueryModel</a>. Dialog class UI Elements receive and return <a class="el" href="class_a_entry.html" title="The Entry class encapsulates table metadata(table name, row id) and data for new and existing entries...">AEntry</a> objects, which are read and written to and from the database via the <a class="el" href="class_a_database.html" title="The DB class encapsulates the SQL database by providing fast access to hot database data.">ADatabase</a> class.</p>
<h1><a class="anchor" id="autotoc_md4"></a>
Settings</h1>
<p>The <a class="el" href="class_a_standard_paths.html" title="The AStandardAppPaths class encapsulates a static QMap holding the standard paths of the application.">AStandardPaths</a> class is responsible for creating cross-platform compatible directory structures based on <a href="https://doc.qt.io/qt-5/qstandardpaths.html">QStandardPaths</a>. Settings are stored in a <code>.ini</code> file at a standardized location. The Settings widget enables the user to adjust various settings, which are stored and accessed via the <a class="el" href="class_a_settings.html" title="Thin wrapper for the QSettings class, simplifying reading and writing of settings.">ASettings</a> class, based on the <a href="https://doc.qt.io/qt-5/qsettings.html">QSettings</a> interface.</p>
<h1><a class="anchor" id="autotoc_md5"></a>
Import / Export</h1>
<p>The <a class="el" href="class_backup_widget.html" title="The BackupWidget is the interface for the user to create and restore backups of the database.">BackupWidget</a> enables creating and restoring backup copies of the database. </p>
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