Selecting the desired stylesheet now works correctly, including saving settings between application launches.

src/ui/MainWindow.cc

@@ -103,7 +103,8 @@ MainWindow::MainWindow(QWidget *parent):
     aboutToCloseFlag(false),
     changingViewsFlag(false),
     centerStackActionGroup(new QActionGroup(this)),
-    styleFileName(QCoreApplication::applicationDirPath() + "/style-indoor.css"),
+    darkStyleFileName(defaultDarkStyle),
+    lightStyleFileName(defaultLightStyle),
     autoReconnect(false),
     lowPowerMode(false)
 {
@@ -114,7 +115,14 @@ MainWindow::MainWindow(QWidget *parent):
     loadSettings();
 
     emit initStatusChanged("Loading Style.");
-    loadStyle(currentStyle, QString());
+    if (currentStyle == QGC_MAINWINDOW_STYLE_LIGHT)
+    {
+        loadStyle(currentStyle, lightStyleFileName);
+    }
+    else
+    {
+        loadStyle(currentStyle, darkStyleFileName);
+    }
 
     if (settings.contains("ADVANCED_MODE"))
     {
@@ -1095,6 +1103,8 @@ void MainWindow::loadSettings()
     settings.beginGroup("QGC_MAINWINDOW");
     autoReconnect = settings.value("AUTO_RECONNECT", autoReconnect).toBool();
     currentStyle = (QGC_MAINWINDOW_STYLE)settings.value("CURRENT_STYLE", currentStyle).toInt();
+    darkStyleFileName = settings.value("DARK_STYLE_FILENAME", darkStyleFileName).toString();
+    lightStyleFileName = settings.value("LIGHT_STYLE_FILENAME", lightStyleFileName).toString();
     lowPowerMode = settings.value("LOW_POWER_MODE", lowPowerMode).toBool();
     dockWidgetTitleBarEnabled = settings.value("DOCK_WIDGET_TITLEBARS",dockWidgetTitleBarEnabled).toBool();
     settings.endGroup();
@@ -1107,6 +1117,8 @@ void MainWindow::storeSettings()
     settings.beginGroup("QGC_MAINWINDOW");
     settings.setValue("AUTO_RECONNECT", autoReconnect);
     settings.setValue("CURRENT_STYLE", currentStyle);
+    settings.setValue("DARK_STYLE_FILENAME", darkStyleFileName);
+    settings.setValue("LIGHT_STYLE_FILENAME", lightStyleFileName);
     settings.endGroup();
     if (!aboutToCloseFlag && isVisible())
     {
@@ -1241,6 +1253,15 @@ bool MainWindow::loadStyle(QGC_MAINWINDOW_STYLE style, QString cssFile)
         style.replace("ICONDIR", QCoreApplication::applicationDirPath() + "files/styles/");
         qApp->setStyleSheet(style);
 
+        if (currentStyle == QGC_MAINWINDOW_STYLE_LIGHT)
+        {
+            lightStyleFileName = cssFile;
+        }
+        else
+        {
+            darkStyleFileName = cssFile;
+        }
+
         // And restore the cursor before returning.
         qApp->restoreOverrideCursor();
         return true;

src/ui/MainWindow.h

@@ -116,10 +116,16 @@ public:
         return currentStyle;
     }
 
-    /** @brief Get current visual style */
-    QString getStyleSheet()
+    /** @brief Get current light visual style */
+    QString getLightStyleSheet()
+    {
+        return lightStyleFileName;
+    }
+
+    /** @brief Get current dark visual style */
+    QString getDarkStyleSheet()
     {
-        return styleFileName;
+        return darkStyleFileName;
     }
     /** @brief Get auto link reconnect setting */
     bool autoReconnectEnabled()
@@ -433,7 +439,8 @@ protected:
     LogCompressor* comp;
     QString screenFileName;
     QTimer* videoTimer;
-    QString styleFileName;
+    QString darkStyleFileName;
+    QString lightStyleFileName;
     bool autoReconnect;
     Qt::WindowStates windowStateVal;
     bool lowPowerMode; ///< If enabled, QGC reduces the update rates of all widgets

src/ui/QGCSettingsWidget.cc

@@ -13,7 +13,8 @@
 
 QGCSettingsWidget::QGCSettingsWidget(QWidget *parent, Qt::WindowFlags flags) :
     QDialog(parent, flags),
-    ui(new Ui::QGCSettingsWidget)
+    ui(new Ui::QGCSettingsWidget),
+    mainWindow((MainWindow*)parent)
 {
     ui->setupUi(this);
 
@@ -35,23 +36,34 @@ QGCSettingsWidget::QGCSettingsWidget(QWidget *parent, Qt::WindowFlags flags) :
     connect(GAudioOutput::instance(), SIGNAL(mutedChanged(bool)), ui->audioMuteCheckBox, SLOT(setChecked(bool)));
 
     // Reconnect
-    ui->reconnectCheckBox->setChecked(MainWindow::instance()->autoReconnectEnabled());
-    connect(ui->reconnectCheckBox, SIGNAL(clicked(bool)), MainWindow::instance(), SLOT(enableAutoReconnect(bool)));
+    ui->reconnectCheckBox->setChecked(mainWindow->autoReconnectEnabled());
+    connect(ui->reconnectCheckBox, SIGNAL(clicked(bool)), mainWindow, SLOT(enableAutoReconnect(bool)));
 
     // Low power mode
-    ui->lowPowerCheckBox->setChecked(MainWindow::instance()->lowPowerModeEnabled());
-    connect(ui->lowPowerCheckBox, SIGNAL(clicked(bool)), MainWindow::instance(), SLOT(enableLowPowerMode(bool)));
+    ui->lowPowerCheckBox->setChecked(mainWindow->lowPowerModeEnabled());
+    connect(ui->lowPowerCheckBox, SIGNAL(clicked(bool)), mainWindow, SLOT(enableLowPowerMode(bool)));
 
     //Dock widget title bars
-    ui->titleBarCheckBox->setChecked(MainWindow::instance()->dockWidgetTitleBarsEnabled());
-    connect(ui->titleBarCheckBox,SIGNAL(clicked(bool)),MainWindow::instance(),SLOT(enableDockWidgetTitleBars(bool)));
+    ui->titleBarCheckBox->setChecked(mainWindow->dockWidgetTitleBarsEnabled());
+    connect(ui->titleBarCheckBox,SIGNAL(clicked(bool)),mainWindow,SLOT(enableDockWidgetTitleBars(bool)));
 
-    // Style
-    MainWindow::QGC_MAINWINDOW_STYLE style = MainWindow::instance()->getStyle();
+    // Intialize the style UI to the proper values obtained from the MainWindow.
+    MainWindow::QGC_MAINWINDOW_STYLE style = mainWindow->getStyle();
     ui->styleChooser->setCurrentIndex(style);
+    if (style == MainWindow::QGC_MAINWINDOW_STYLE_DARK)
+    {
+        ui->styleSheetFile->setText(mainWindow->getDarkStyleSheet());
+    }
+    else
+    {
+        ui->styleSheetFile->setText(mainWindow->getLightStyleSheet());
+    }
+
+    // And then connect all the signals for the UI for changing styles.
     connect(ui->styleChooser, SIGNAL(currentIndexChanged(int)), this, SLOT(styleChanged(int)));
     connect(ui->styleCustomButton, SIGNAL(clicked()), this, SLOT(selectStylesheet()));
     connect(ui->styleDefaultButton, SIGNAL(clicked()), this, SLOT(setDefaultStyle()));
+    connect(ui->styleSheetFile, SIGNAL(editingFinished()), this, SLOT(lineEditFinished()));
 
     // Close / destroy
     connect(ui->buttonBox, SIGNAL(accepted()), this, SLOT(deleteLater()));
@@ -100,17 +112,7 @@ void QGCSettingsWidget::selectStylesheet()
     // And update the UI as needed.
     else
     {
-        switch (ui->styleChooser->currentIndex())
-        {
-        case 0:
-            darkStyleSheet = newStyleFileName;
-            ui->styleSheetFile->setText(darkStyleSheet);
-            MainWindow::instance()->loadStyle(MainWindow::QGC_MAINWINDOW_STYLE_DARK, darkStyleSheet);
-        case 1:
-            lightStyleSheet = newStyleFileName;
-            ui->styleSheetFile->setText(lightStyleSheet);
-            MainWindow::instance()->loadStyle(MainWindow::QGC_MAINWINDOW_STYLE_LIGHT, lightStyleSheet);
-        }
+        ui->styleSheetFile->setText(newStyleFileName);
     }
 }
 
@@ -119,27 +121,41 @@ bool QGCSettingsWidget::updateStyle(QString style)
     switch (ui->styleChooser->currentIndex())
     {
     case 0:
-        darkStyleSheet = style;
-        return MainWindow::instance()->loadStyle(MainWindow::QGC_MAINWINDOW_STYLE_DARK, darkStyleSheet);
+        return mainWindow->loadStyle(MainWindow::QGC_MAINWINDOW_STYLE_DARK, style);
     case 1:
-        lightStyleSheet = style;
-        return MainWindow::instance()->loadStyle(MainWindow::QGC_MAINWINDOW_STYLE_LIGHT, lightStyleSheet);
+        return mainWindow->loadStyle(MainWindow::QGC_MAINWINDOW_STYLE_LIGHT, style);
     default:
         return false;
     }
 }
 
+void QGCSettingsWidget::lineEditFinished()
+{
+    QString newStyleFileName(ui->styleSheetFile->text());
+    QFile newStyleFile(newStyleFileName);
+    if (!newStyleFile.exists() || !updateStyle(newStyleFileName))
+    {
+        QMessageBox msgBox;
+        msgBox.setIcon(QMessageBox::Information);
+        msgBox.setText(tr("QGroundControl did not load a new style"));
+        msgBox.setInformativeText(tr("Stylesheet file %1 was not readable").arg(newStyleFileName));
+        msgBox.setStandardButtons(QMessageBox::Ok);
+        msgBox.setDefaultButton(QMessageBox::Ok);
+        msgBox.exec();
+    }
+}
+
 void QGCSettingsWidget::styleChanged(int index)
 {
     if (index == 1)
     {
-        ui->styleSheetFile->setText(lightStyleSheet);
-        updateStyle(lightStyleSheet);
+        ui->styleSheetFile->setText(mainWindow->getLightStyleSheet());
+        mainWindow->loadStyle(MainWindow::QGC_MAINWINDOW_STYLE_LIGHT, mainWindow->getLightStyleSheet());
     }
     else
     {
-        ui->styleSheetFile->setText(darkStyleSheet);
-        updateStyle(darkStyleSheet);
+        ui->styleSheetFile->setText(mainWindow->getDarkStyleSheet());
+        mainWindow->loadStyle(MainWindow::QGC_MAINWINDOW_STYLE_DARK, mainWindow->getDarkStyleSheet());
     }
 }
 
@@ -147,14 +163,12 @@ void QGCSettingsWidget::setDefaultStyle()
 {
     if (ui->styleChooser->currentIndex() == 1)
     {
-        lightStyleSheet = MainWindow::defaultLightStyle;
-        ui->styleSheetFile->setText(lightStyleSheet);
-        updateStyle(lightStyleSheet);
+        ui->styleSheetFile->setText(MainWindow::defaultLightStyle);
+        mainWindow->loadStyle(MainWindow::QGC_MAINWINDOW_STYLE_LIGHT, MainWindow::defaultLightStyle);
     }
     else
     {
-        darkStyleSheet = MainWindow::defaultDarkStyle;
-        ui->styleSheetFile->setText(darkStyleSheet);
-        updateStyle(darkStyleSheet);
+        ui->styleSheetFile->setText(MainWindow::defaultDarkStyle);
+        mainWindow->loadStyle(MainWindow::QGC_MAINWINDOW_STYLE_DARK, MainWindow::defaultDarkStyle);
     }
 }

src/ui/QGCSettingsWidget.h

@@ -2,6 +2,7 @@
 #define QGCSETTINGSWIDGET_H
 
 #include <QDialog>
+#include "MainWindow.h"
 
 namespace Ui
 {
@@ -18,13 +19,13 @@ public:
 
 public slots:
     void styleChanged(int index);
+    void lineEditFinished();
     void setDefaultStyle();
     void selectStylesheet();
 
 private:
+    MainWindow* mainWindow;
     Ui::QGCSettingsWidget* ui;
-    QString darkStyleSheet;
-    QString lightStyleSheet;
     bool updateStyle(QString style);
 };
 

src/ui/QGCSettingsWidget.ui

@@ -128,6 +128,9 @@
               <property name="text">
                <string>Custom</string>
               </property>
+              <property name="autoDefault">
+               <bool>false</bool>
+              </property>
              </widget>
             </item>
             <item>
@@ -135,6 +138,9 @@
               <property name="text">
                <string>Default</string>
               </property>
+              <property name="autoDefault">
+               <bool>false</bool>
+              </property>
              </widget>
             </item>
            </layout>
@@ -167,6 +173,9 @@
      <property name="standardButtons">
       <set>QDialogButtonBox::Close</set>
      </property>
+     <property name="centerButtons">
+      <bool>false</bool>
+     </property>
     </widget>
    </item>
   </layout>