Refactored QGC startup so that MainWindow::instance() is usable everywhere. This was required to get the styling working properly for ChartPlot.

src/QGCCore.cc

@@ -129,25 +129,24 @@ QGCCore::QGCCore(int &argc, char* argv[]) : QApplication(argc, argv)
     // setFont(fontDatabase.font(fontFamilyName, "Roman", 12));
 
     // Start the comm link manager
-    splashScreen->showMessage(tr("Starting Communication Links"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
+    splashScreen->showMessage(tr("Starting communication links"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
     startLinkManager();
 
     // Start the UAS Manager
-    splashScreen->showMessage(tr("Starting UAS Manager"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
+    splashScreen->showMessage(tr("Starting UAS manager"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
     startUASManager();
 
     // Start the user interface
-    splashScreen->showMessage(tr("Starting User Interface"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
-    // Start UI
+    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(splashScreen);
 
     // Connect links
     // to make sure that all components are initialized when the
     // first messages arrive
     UDPLink* udpLink = new UDPLink(QHostAddress::Any, 14550);
     MainWindow::instance()->addLink(udpLink);
-    // Listen on Multicast-Address 239.255.77.77, Port 14550
-    //QHostAddress * multicast_udp = new QHostAddress("239.255.77.77");
-    //UDPLink* udpLink = new UDPLink(*multicast_udp, 14550);
 
 #ifdef OPAL_RT
     // Add OpalRT Link, but do not connect
@@ -157,8 +156,6 @@ QGCCore::QGCCore(int &argc, char* argv[]) : QApplication(argc, argv)
     MAVLinkSimulationLink* simulationLink = new MAVLinkSimulationLink(":/demo-log.txt");
     simulationLink->disconnect();
 
-    mainWindow = MainWindow::instance(splashScreen);
-
     // Remove splash screen
     splashScreen->finish(mainWindow);
 
@@ -211,7 +208,7 @@ QGCCore::~QGCCore()
     // then links
     delete LinkManager::instance();
     // Finally the main window
-	delete MainWindow::instance();
+    delete MainWindow::instance();
 }
 
 /**

src/ui/MainWindow.cc

@@ -79,14 +79,15 @@ const QString MainWindow::defaultLightStyle = ":files/styles/style-light.css";
 MainWindow* MainWindow::instance(QSplashScreen* screen)
 {
     static MainWindow* _instance = 0;
-    if(_instance == 0)
+    if (_instance == 0)
     {
         _instance = new MainWindow();
-        if (screen) connect(_instance, SIGNAL(initStatusChanged(QString)), screen, SLOT(showMessage(QString)));
-
-        /* Set the application as parent to ensure that this object
-                 * will be destroyed when the main application exits */
-        //_instance->setParent(qApp);
+        if (screen)
+        {
+            connect(_instance, SIGNAL(initStatusChanged(QString,int,QColor)),
+                    screen, SLOT(showMessage(QString,int,QColor)));
+        }
+        _instance->init();
     }
     return _instance;
 }
@@ -108,15 +109,19 @@ MainWindow::MainWindow(QWidget *parent):
     darkStyleFileName(defaultDarkStyle),
     lightStyleFileName(defaultLightStyle),
     autoReconnect(false),
-    lowPowerMode(false)
+    lowPowerMode(false),
+    dockWidgetTitleBarEnabled(true),
+    isAdvancedMode(false)
 {
     hide();
-    dockWidgetTitleBarEnabled = true;
-    isAdvancedMode = false;
-    emit initStatusChanged("Loading UI Settings..");
+}
+
+void MainWindow::init()
+{
+    emit initStatusChanged(tr("Loading settings"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
     loadSettings();
 
-    emit initStatusChanged("Loading Style.");
+    emit initStatusChanged(tr("Loading style"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
     qApp->setStyle("plastique");
     if (currentStyle == QGC_MAINWINDOW_STYLE_LIGHT)
     {
@@ -151,8 +156,7 @@ MainWindow::MainWindow(QWidget *parent):
     }
 
     settings.sync();
-
-    emit initStatusChanged("Setting up user interface.");
+    emit initStatusChanged(tr("Setting up user interface"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
 
     // Setup user interface
     ui.setupUi(this);
@@ -196,18 +200,18 @@ MainWindow::MainWindow(QWidget *parent):
     setStatusBar(customStatusBar);
     statusBar()->setSizeGripEnabled(true);
 
-    emit initStatusChanged("Building common widgets.");
+    emit initStatusChanged(tr("Building common widgets"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
 
     buildCommonWidgets();
     connectCommonWidgets();
 
-    emit initStatusChanged("Building common actions.");
+    emit initStatusChanged(tr("Building common actions"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
 
     // Create actions
     connectCommonActions();
 
     // Populate link menu
-    emit initStatusChanged("Populating link menu");
+    emit initStatusChanged(tr("Populating link menu"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
     QList<LinkInterface*> links = LinkManager::instance()->getLinks();
     foreach(LinkInterface* link, links)
     {
@@ -217,19 +221,19 @@ MainWindow::MainWindow(QWidget *parent):
     connect(LinkManager::instance(), SIGNAL(newLink(LinkInterface*)), this, SLOT(addLink(LinkInterface*)));
 
     // Connect user interface devices
-    emit initStatusChanged("Initializing joystick interface.");
+    emit initStatusChanged(tr("Initializing joystick interface"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
     joystickWidget = 0;
     joystick = new JoystickInput();
 
 #ifdef MOUSE_ENABLED_WIN
-    emit initStatusChanged("Initializing 3D mouse interface.");
+    emit initStatusChanged(tr("Initializing 3D mouse interface", Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
 
     mouseInput = new Mouse3DInput(this);
     mouse = new Mouse6dofInput(mouseInput);
 #endif //MOUSE_ENABLED_WIN
 
 #if MOUSE_ENABLED_LINUX
-    emit initStatusChanged("Initializing 3D mouse interface.");
+    emit initStatusChanged(tr("Initializing 3D mouse interface"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
 
     mouse = new Mouse6dofInput(this);
     connect(this, SIGNAL(x11EventOccured(XEvent*)), mouse, SLOT(handleX11Event(XEvent*)));
@@ -251,12 +255,12 @@ MainWindow::MainWindow(QWidget *parent):
     // Initialize window state
     windowStateVal = windowState();
 
-    emit initStatusChanged("Restoring last view state.");
+    emit initStatusChanged(tr("Restoring last view state"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
 
     // Restore the window setup
     loadViewState();
 
-    emit initStatusChanged("Restoring last window size.");
+    emit initStatusChanged(tr("Restoring last window size"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
     // Restore the window position and size
     if (settings.contains(getWindowGeometryKey()))
     {
@@ -285,7 +289,7 @@ MainWindow::MainWindow(QWidget *parent):
 
     connect(&windowNameUpdateTimer, SIGNAL(timeout()), this, SLOT(configureWindowName()));
     windowNameUpdateTimer.start(15000);
-    emit initStatusChanged("Done.");
+    emit initStatusChanged(tr("Done"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
     show();
 }
 

src/ui/MainWindow.h

@@ -97,15 +97,38 @@ class MainWindow : public QMainWindow
     Q_OBJECT
 
 public:
+    /**
+     * A static function for obtaining the sole instance of the MainWindow. The screen
+     * argument is only important on the FIRST call to this function. The provided splash
+     * screen is updated with some status messages that are emitted during init(). This
+     * function cannot be used within the MainWindow constructor!
+     */
     static MainWindow* instance(QSplashScreen* screen = 0);
+
+    /**
+     * Initializes the MainWindow. Some variables are initialized and the widget is hidden.
+     * Initialization of the MainWindow class really occurs in init(), which loads the UI
+     * and does everything important. The constructor is split in two like this so that
+     * the instance() is available for all classes.
+     */
+    MainWindow(QWidget *parent = NULL);
     ~MainWindow();
 
+    /**
+     * This function actually performs the non-trivial initialization of the MainWindow
+     * class. This is separate from the constructor because instance() won't work within
+     * code executed in the MainWindow constructor.
+     */
+    void init();
+
     enum QGC_MAINWINDOW_STYLE
     {
         QGC_MAINWINDOW_STYLE_DARK,
         QGC_MAINWINDOW_STYLE_LIGHT
     };
 
+    // Declare default dark and light stylesheets. These should be file-resource
+    // paths.
     static const QString defaultDarkStyle;
     static const QString defaultLightStyle;
 
@@ -115,13 +138,13 @@ public:
         return currentStyle;
     }
 
-    /** @brief Get current light visual stylesheet */
+    /** @brief Get current light visual stylesheet */
     QString getLightStyleSheet()
     {
         return lightStyleFileName;
     }
 
-    /** @brief Get current dark visual stylesheet */
+    /** @brief Get current dark visual stylesheet */
     QString getDarkStyleSheet()
     {
         return darkStyleFileName;
@@ -257,7 +280,7 @@ public slots:
 
 signals:
     void styleChanged(MainWindow::QGC_MAINWINDOW_STYLE newTheme);
-    void initStatusChanged(const QString& message);
+    void initStatusChanged(const QString& message, int alignment, const QColor &color);
 #ifdef MOUSE_ENABLED_LINUX
     /** @brief Forward X11Event to catch 3DMouse inputs */
     void x11EventOccured(XEvent *event);
@@ -276,8 +299,6 @@ public:
 
 protected:
 
-    MainWindow(QWidget *parent = 0);
-
     typedef enum _VIEW_SECTIONS
     {
         VIEW_ENGINEER,

src/ui/linechart/ChartPlot.cc

@@ -53,10 +53,10 @@ ChartPlot::ChartPlot(QWidget *parent):
     }
 
     // Now that all objects have been initialized, color everything.
-    applyColorScheme(((MainWindow*)parent)->getStyle());
+    applyColorScheme(MainWindow::instance()->getStyle());
 
     // And make sure we're listening for future style changes
-    connect(parent, SIGNAL(styleChanged(MainWindow::QGC_MAINWINDOW_STYLE)),
+    connect(MainWindow::instance(), SIGNAL(styleChanged(MainWindow::QGC_MAINWINDOW_STYLE)),
             this, SLOT(applyColorScheme(MainWindow::QGC_MAINWINDOW_STYLE)));
 }