Change window close event to hide window

AdaptiveBrightness/main_window.cpp

@@ -5,6 +5,7 @@
 
 #include <cmath>
 
+#include <QCloseEvent>
 #include <QGroupBox>
 #include <QSlider>
 #include <QtDebug>
@@ -52,7 +53,7 @@ MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent)
             m_visibility = !m_visibility;
         });
         m_trayIconMenu->addSeparator();
-        m_trayIconMenu->addAction(tr("Quit"), this, &QWidget::close);
+        m_trayIconMenu->addAction(tr("Quit"), this, &QCoreApplication::quit);
 
         qDebug(ltr("Tray icon context menu initialized"));
 
@@ -64,9 +65,13 @@ MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent)
         qDebug(ltr("Tray icon initialized"));
     }
 
-    m_timer = new QTimer(this);
-    connect(m_timer, &QTimer::timeout, this, &MainWindow::updateState);
-    m_timer->start(1000);
+    m_timerThread = new QThread(this);
+    m_timer = new QTimer(nullptr);
+    m_timer->setInterval(1000);
+    m_timer->moveToThread(m_timerThread);
+    m_timerThread->connect(m_timer, &QTimer::timeout, this, &MainWindow::updateState, Qt::DirectConnection);
+    m_timer->connect(m_timerThread, SIGNAL(started()), SLOT(start()));
+    m_timerThread->start();
 
     qDebug(ltr("Tray icon update timer started"));
 
@@ -77,6 +82,17 @@ MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent)
 MainWindow::~MainWindow()
 {
     qDebug(ltr("Destroying main window"));
+
+    m_timerThread->quit();
+    if(!m_timerThread->wait()) {
+        qCritical(ltr("Timer thread did not terminate cleanly"));
+    }
+}
+
+void MainWindow::closeEvent(QCloseEvent* event)
+{
+    m_showHideAction->activate(QAction::Trigger);
+    event->ignore();
 }
 
 void MainWindow::loadIcons()

AdaptiveBrightness/main_window.hpp

@@ -9,6 +9,7 @@
 #include <QMainWindow>
 #include <QMenu>
 #include <QSystemTrayIcon>
+#include <QThread>
 #include <QTimer>
 
 #include "monitor.hpp"
@@ -24,6 +25,8 @@ class MainWindow : public QMainWindow {
     ~MainWindow();
 
   private:
+    void closeEvent(QCloseEvent* event) override;
+
     void loadIcons();
 
     void updateState();
@@ -39,6 +42,7 @@ class MainWindow : public QMainWindow {
     QMenu* m_trayIconMenu = nullptr;
     QSystemTrayIcon* m_trayIcon = nullptr;
 
+    QThread* m_timerThread = nullptr;
     QTimer* m_timer = nullptr;
 
     float m_brightness = 0.5f;