Saved files location support

- Also renamed QGCCore->QGCApplication to better reflect usage.
- New global qgcApp api to access main QHCApplication singleton

src/QGCCore.cc

 /*=====================================================================
  
-QGroundControl Open Source Ground Control Station
+ QGroundControl Open Source Ground Control Station
  
-(c) 2009, 2010 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
+ (c) 2009 - 2015 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
  
-This file is part of the QGROUNDCONTROL project
+ This file is part of the QGROUNDCONTROL project
  
  QGROUNDCONTROL is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
@@ -19,11 +19,11 @@ This file is part of the QGROUNDCONTROL project
  You should have received a copy of the GNU General Public License
  along with QGROUNDCONTROL. If not, see <http://www.gnu.org/licenses/>.
  
-======================================================================*/
+ ======================================================================*/
 
 /**
  * @file
- *   @brief Implementation of class QGCCore
+ *   @brief Implementation of class QGCApplication
  *
  *   @author Lorenz Meier <mavteam@student.ethz.ch>
  *
@@ -55,8 +55,14 @@ This file is part of the QGROUNDCONTROL project
 #include "MAVLinkSimulationLink.h"
 #include "SerialLink.h"
 
-const char* QGCCore::deleteAllSettingsKey = "DeleteAllSettingsNextBoot";
-const char* QGCCore::_settingsVersionKey = "SettingsVersion";
+const char* QGCApplication::_deleteAllSettingsKey = "DeleteAllSettingsNextBoot";
+const char* QGCApplication::_settingsVersionKey = "SettingsVersion";
+const char* QGCApplication::_savedFilesLocationKey = "SavedFilesLocation";
+const char* QGCApplication::_promptFlightDataSave = "PromptFLightDataSave";
+
+const char* QGCApplication::_defaultSavedFileDirectoryName = "QGroundControl";
+const char* QGCApplication::_savedFileMavlinkLogDirectoryName = "FlightData";
+const char* QGCApplication::_savedFileParameterDirectoryName = "SavedParameters";
 
 /**
  * @brief Constructor for the main application.
@@ -69,9 +75,9 @@ const char* QGCCore::_settingsVersionKey = "SettingsVersion";
  **/
 
 
-QGCCore::QGCCore(int &argc, char* argv[]) :
-    QApplication(argc, argv),
-    _mainWindow(NULL)
+QGCApplication::QGCApplication(int &argc, char* argv[]) :
+QApplication(argc, argv),
+_mainWindow(NULL)
 {
     // Set application information
     this->setApplicationName(QGC_APPLICATION_NAME);
@@ -101,7 +107,7 @@ QGCCore::QGCCore(int &argc, char* argv[]) :
     QSettings settings;
     
     // The setting will delete all settings on this boot
-    fClearSettingsOptions |= settings.contains(deleteAllSettingsKey);
+    fClearSettingsOptions |= settings.contains(_deleteAllSettingsKey);
     
     if (fClearSettingsOptions) {
         // User requested settings to be cleared on command line
@@ -112,7 +118,7 @@ QGCCore::QGCCore(int &argc, char* argv[]) :
     
 }
 
-bool QGCCore::init(void)
+bool QGCApplication::init(void)
 {
     QSettings settings;
     
@@ -136,6 +142,40 @@ bool QGCCore::init(void)
         settings.setValue(_settingsVersionKey, QGC_SETTINGS_VERSION);
     }
     
+    // Load saved files location and validate
+    
+    QString savedFilesLocation;
+    if (settings.contains(_savedFilesLocationKey)) {
+        savedFilesLocation = settings.value(_savedFilesLocationKey).toString();
+    } else {
+        // No location set. Create a default one in Documents standard location.
+        
+        QString documentsLocation = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
+        
+        QDir documentsDir(documentsLocation);
+        Q_ASSERT(documentsDir.exists());
+        
+        if (documentsDir.mkpath(_defaultSavedFileDirectoryName)) {
+            savedFilesLocation = documentsDir.filePath(_defaultSavedFileDirectoryName);
+        }
+    }
+    
+    if (!savedFilesLocation.isEmpty()) {
+        if (!validatePossibleSavedFilesLocation(savedFilesLocation)) {
+            savedFilesLocation.clear();
+        }
+    }
+    
+    // If we made it this far and we still don't have a location. Either the specfied location was invalid
+    // or we coudn't create a default location. Either way, we need to let the user know and prompt for a new
+    /// settings.
+    if (savedFilesLocation.isEmpty()) {
+        QMessageBox::warning(MainWindow::instance(),
+                             tr("Bad save location"),
+                             tr("The location to save files to is invalid, or cannot be written to. Please provide a new one."));
+        MainWindow::instance()->showSettings();
+    }
+    
     mode = (enum MainWindow::CUSTOM_MODE) settings.value("QGC_CUSTOM_MODE", (int)MainWindow::CUSTOM_MODE_PX4).toInt();
     
     settings.sync();
@@ -169,9 +209,7 @@ bool QGCCore::init(void)
     
     // Start the user interface
     splashScreen->showMessage(tr("Starting user interface"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
-    
-    // The first call to instance() creates the MainWindow, so make sure it's passed the splashScreen.
-    _mainWindow = MainWindow::instance_mode(splashScreen, mode);
+    _mainWindow = MainWindow::_create(splashScreen, mode);
     
     UDPLink* udpLink = NULL;
     
@@ -196,6 +234,7 @@ bool QGCCore::init(void)
     
     // Remove splash screen
     splashScreen->finish(_mainWindow);
+    _mainWindow->splashScreenFinished();
     
     if (settingsUpgraded) {
         _mainWindow->showInfoMessage(tr("Settings Cleared"),
@@ -204,7 +243,7 @@ bool QGCCore::init(void)
     }
     
     // Check if link could be connected
-    if (udpLink && !udpLink->connect())
+    if (udpLink && !LinkManager::instance()->connectLink(udpLink))
     {
         QMessageBox msgBox;
         msgBox.setIcon(QMessageBox::Critical);
@@ -232,7 +271,7 @@ bool QGCCore::init(void)
  * @brief Destructor for the groundstation. It destroys all loaded instances.
  *
  **/
-QGCCore::~QGCCore()
+QGCApplication::~QGCApplication()
 {
     delete UASManager::instance();
     delete LinkManager::instance();
@@ -244,7 +283,7 @@ QGCCore::~QGCCore()
  * The link manager keeps track of all communication links and provides the global
  * packet queue. It is the main communication hub
  **/
-void QGCCore::startLinkManager()
+void QGCApplication::startLinkManager()
 {
     LinkManager::instance();
 }
@@ -253,7 +292,7 @@ void QGCCore::startLinkManager()
  * @brief Start the Unmanned Air System Manager
  *
  **/
-void QGCCore::startUASManager()
+void QGCApplication::startUASManager()
 {
     // Load UAS plugins
     QDir pluginsDir = QDir(qApp->applicationDirPath());
@@ -289,3 +328,98 @@ void QGCCore::startUASManager()
         }
     }
 }
+
+void QGCApplication::deleteAllSettingsNextBoot(void)
+{
+    QSettings settings;
+    settings.setValue(_deleteAllSettingsKey, true);
+}
+
+void QGCApplication::clearDeleteAllSettingsNextBoot(void)
+{
+    QSettings settings;
+    settings.remove(_deleteAllSettingsKey);
+}
+
+void QGCApplication::setSavedFilesLocation(QString& location)
+{
+    QSettings settings;
+    settings.setValue(_savedFilesLocationKey, location);
+}
+
+bool QGCApplication::validatePossibleSavedFilesLocation(QString& location)
+{
+    // Make sure we can write to the directory
+    QString filename = QDir(location).filePath("QGCTempXXXXXXXX.tmp");
+    QTemporaryFile tempFile(filename);
+    if (!tempFile.open()) {
+        return false;
+    }
+    
+    return true;
+}
+
+QString QGCApplication::savedFilesLocation(void)
+{
+    QSettings settings;
+    
+    Q_ASSERT(settings.contains(_savedFilesLocationKey));
+    return settings.value(_savedFilesLocationKey).toString();
+}
+
+QString QGCApplication::savedParameterFilesLocation(void)
+{
+    QString location;
+    QDir    parentDir(savedFilesLocation());
+    
+    location = parentDir.filePath(_savedFileParameterDirectoryName);
+    
+    if (!QDir(location).exists()) {
+        // If directory doesn't exist, try to create it
+        if (!parentDir.mkpath(_savedFileParameterDirectoryName)) {
+            // Return an error
+            location.clear();
+        }
+    }
+    
+    return location;
+}
+
+QString QGCApplication::mavlinkLogFilesLocation(void)
+{
+    QString location;
+    QDir    parentDir(savedFilesLocation());
+    
+    location = parentDir.filePath(_savedFileMavlinkLogDirectoryName);
+    
+    if (!QDir(location).exists()) {
+        // If directory doesn't exist, try to create it
+        if (!parentDir.mkpath(_savedFileMavlinkLogDirectoryName)) {
+            // Return an error
+            location.clear();
+        }
+    }
+    
+    return location;
+}
+
+bool QGCApplication::promptFlightDataSave(void)
+{
+    QSettings settings;
+    
+    return settings.value(_promptFlightDataSave, true).toBool();
+}
+
+void QGCApplication::setPromptFlightDataSave(bool promptForSave)
+{
+    QSettings settings;
+    settings.setValue(_promptFlightDataSave, promptForSave);
+}
+
+/// @brief Returns the QGCApplication object singleton.
+QGCApplication* qgcApp(void)
+{
+    QGCApplication* app = dynamic_cast<QGCApplication*>(qApp);
+    Q_ASSERT(app);
+    return app;
+}

src/QGCCore.h

 /*=====================================================================
  
-PIXHAWK Micro Air Vehicle Flying Robotics Toolkit
+ QGroundControl Open Source Ground Control Station
  
-(c) 2009, 2010 PIXHAWK PROJECT  <http://pixhawk.ethz.ch>
+ (c) 2009 - 2015 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
  
-This file is part of the PIXHAWK project
+ This file is part of the QGROUNDCONTROL project
  
-    PIXHAWK is free software: you can redistribute it and/or modify
+ QGROUNDCONTROL is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
-    PIXHAWK is distributed in the hope that it will be useful,
+ QGROUNDCONTROL is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
-    along with PIXHAWK. If not, see <http://www.gnu.org/licenses/>.
+ along with QGROUNDCONTROL. If not, see <http://www.gnu.org/licenses/>.
  
-======================================================================*/
+ ======================================================================*/
 
 /**
  * @file
@@ -30,8 +30,8 @@ This file is part of the PIXHAWK project
  */
 
 
-#ifndef QGC_CORE_H
-#define QGC_CORE_H
+#ifndef QGCAPPLICATION_H
+#define QGCAPPLICATION_H
 
 #include <QApplication>
 
@@ -42,6 +42,7 @@ This file is part of the PIXHAWK project
 #include "OpalLink.h"
 #endif
 
+
 /**
  * @brief The main application and management class.
  *
@@ -49,19 +50,44 @@ This file is part of the PIXHAWK project
  * the central management unit of the groundstation application.
  *
  **/
-class QGCCore : public QApplication
+class QGCApplication : public QApplication
 {
     Q_OBJECT
     
 public:
-    QGCCore(int &argc, char* argv[]);
-    ~QGCCore();
+    QGCApplication(int &argc, char* argv[]);
+    ~QGCApplication();
     
     /// @brief Initialize the applicaation.
     /// @return false: init failed, app should exit
     bool init(void);
     
-    static const char* deleteAllSettingsKey;
+    /// @brief Sets the persistent flag to delete all settings the next time QGroundControl is started.
+    void deleteAllSettingsNextBoot(void);
+    
+    /// @brief Clears the persistent flag to delete all settings the next time QGroundControl is started.
+    void clearDeleteAllSettingsNextBoot(void);
+    
+    /// @brief Returns the location of user visible saved file associated with QGroundControl
+    QString savedFilesLocation(void);
+    
+    /// @brief Sets the location of user visible saved file associated with QGroundControl
+    void setSavedFilesLocation(QString& location);
+    
+    /// @brief Location to save and load parameter files from.
+    QString savedParameterFilesLocation(void);
+    
+    /// @brief Location to save and load mavlink log files from
+    QString mavlinkLogFilesLocation(void);
+    
+    /// @brief Validates that the specified location will work for the saved files location.
+    bool validatePossibleSavedFilesLocation(QString& location);
+    
+    /// @brief Returns true is all mavlink connections should be logged
+    bool promptFlightDataSave(void);
+    
+    /// @brief Sets the flag to log all mavlink connections
+    void setPromptFlightDataSave(bool promptForSave);
     
 protected:
     void startLinkManager();
@@ -75,7 +101,18 @@ protected:
     
 private:
     MainWindow* _mainWindow;
-    static const char* _settingsVersionKey;
+    
+    static const char* _settingsVersionKey;             ///< Settings key which hold settings version
+    static const char* _deleteAllSettingsKey;           ///< If this settings key is set on boot, all settings will be deleted
+    static const char* _savedFilesLocationKey;          ///< Settings key for user visible saved files location
+    static const char* _promptFlightDataSave;           ///< Settings key to prompt for saving Flight Data Log for all flights
+    
+    static const char* _defaultSavedFileDirectoryName;      ///< Default name for user visible save file directory
+    static const char* _savedFileMavlinkLogDirectoryName;   ///< Name of mavlink log subdirectory
+    static const char* _savedFileParameterDirectoryName;    ///< Name of parameter subdirectory
 };
 
-#endif /* _CORE_H_ */
+/// @brief Returns the QGCApplication object singleton.
+QGCApplication* qgcApp(void);
+
+#endif