Add logging and handle tray icon not being available

AdaptiveBrightness/AdaptiveBrightness.cpp

@@ -1,38 +1,55 @@
 #include "AdaptiveBrightness.hpp"
 
+#include <QtGlobal>
+
 AdaptiveBrightness::AdaptiveBrightness(QWidget* parent) : QMainWindow(parent), m_currentIcon(0), m_visibility(true)
 {
     m_ui.setupUi(this);
 
     loadIcons();
 
-    m_trayIconMenu = new QMenu(this);
-    m_showHideAction = m_trayIconMenu->addAction(tr("Hide"), [this]() {
-        if(m_visibility) {
-            m_showHideAction->setText(tr("Show"));
-            hide();
-        }
-        else {
-            m_showHideAction->setText(tr("Hide"));
-            show();
-        }
-        m_visibility = !m_visibility;
-    });
-    m_trayIconMenu->addSeparator();
-    m_trayIconMenu->addAction(tr("Quit"), this, &QWidget::close);
+    if(!QSystemTrayIcon::isSystemTrayAvailable()) {
+        qWarning("System tray is not available -> tray icon will be disabled");
+    }
+    else {
+        qDebug("System tray is available");
 
-    m_trayIcon = new QSystemTrayIcon(this);
-    m_trayIcon->setIcon(*m_icons[9]);
-    m_trayIcon->setContextMenu(m_trayIconMenu);
-    m_trayIcon->show();
+        m_trayIconMenu = new QMenu(this);
+        m_showHideAction = m_trayIconMenu->addAction(tr("Hide"), [this]() {
+            if(m_visibility) {
+                m_showHideAction->setText(tr("Show"));
+                hide();
+            }
+            else {
+                m_showHideAction->setText(tr("Hide"));
+                show();
+            }
+            m_visibility = !m_visibility;
+        });
+        m_trayIconMenu->addSeparator();
+        m_trayIconMenu->addAction(tr("Quit"), this, &QWidget::close);
+
+        qDebug("Tray icon context menu initialized");
+
+        m_trayIcon = new QSystemTrayIcon(this);
+        m_trayIcon->setIcon(*m_icons[9]);
+        m_trayIcon->setContextMenu(m_trayIconMenu);
+        m_trayIcon->show();
+
+        qDebug("Tray icon initialized");
+    }
 
     m_timer = new QTimer(this);
     connect(m_timer, &QTimer::timeout, this, &AdaptiveBrightness::nextIcon);
     m_timer->start(500);
+
+    qDebug("Tray icon update timer started");
 }
 
 void AdaptiveBrightness::loadIcons()
 {
+    qDebug("Loading icons");
+
     constexpr auto ICON_PATHS = std::array{
         ":/AdaptiveBrightness/resources/brightness_0.ico",     ":/AdaptiveBrightness/resources/brightness_1.ico",
         ":/AdaptiveBrightness/resources/brightness_2.ico",     ":/AdaptiveBrightness/resources/brightness_3.ico",
@@ -45,10 +62,19 @@ void AdaptiveBrightness::loadIcons()
     for(std::size_t i = 0; i < ICON_PATHS.size(); ++i) {
         m_icons[i] = std::make_unique<QIcon>(ICON_PATHS[i]);
     }
+
+    qDebug("Icons loaded");
 }
 
 void AdaptiveBrightness::nextIcon()
 {
+    qDebug("Cycling to next icon");
+
+    if(!m_trayIcon) {
+        qWarning("Cannot cycle through tray icons, because no tray icon is available");
+        return;
+    }
+
     m_currentIcon = (m_currentIcon + 1) % m_icons.size();
     m_trayIcon->setIcon(*m_icons[m_currentIcon]);
 }

AdaptiveBrightness/AdaptiveBrightness.hpp

@@ -27,9 +27,9 @@ class AdaptiveBrightness : public QMainWindow {
     std::array<std::unique_ptr<QIcon>, 12> m_icons;
     std::size_t m_currentIcon;
     bool m_visibility;
-    QAction* m_showHideAction;
-    QMenu* m_trayIconMenu;
-    QSystemTrayIcon* m_trayIcon;
+    QAction* m_showHideAction = nullptr;
+    QMenu* m_trayIconMenu = nullptr;
+    QSystemTrayIcon* m_trayIcon = nullptr;
 
     QTimer* m_timer;
 };

AdaptiveBrightness/main.cpp

@@ -10,6 +10,8 @@ int main(int argc, char* argv[])
 {
     qInstallMessageHandler(logToFile);
 
+    qDebug("Starting application");
+
     QApplication application(argc, argv);
     AdaptiveBrightness mainWindow;
     mainWindow.show();