implement a (nonperfect) hide-to-tray on win close

src/core/Config.cpp

@@ -106,6 +106,7 @@ void Config::init(const QString& fileName)
     m_defaults.insert("GUI/Language", "system");
     m_defaults.insert("GUI/ShowTrayIcon", false);
     m_defaults.insert("GUI/MinimizeToTray", false);
+    m_defaults.insert("GUI/MinimizeOnClose", false);
 }
 
 Config* Config::instance()

src/gui/MainWindow.cpp

@@ -71,6 +71,8 @@ MainWindow::MainWindow()
     : m_ui(new Ui::MainWindow())
     , m_trayIcon(Q_NULLPTR)
 {
+    appExitCalled = false;
+
     m_ui->setupUi(this);
 
     m_countDefaultAttributes = m_ui->menuEntryCopyAttribute->actions().size();
@@ -202,7 +204,7 @@ MainWindow::MainWindow()
             SLOT(importKeePass1Database()));
     connect(m_ui->actionLockDatabases, SIGNAL(triggered()), m_ui->tabWidget,
             SLOT(lockDatabases()));
-    connect(m_ui->actionQuit, SIGNAL(triggered()), SLOT(close()));
+    connect(m_ui->actionQuit, SIGNAL(triggered()), SLOT(appExit()));
 
     m_actionMultiplexer.connect(m_ui->actionEntryNew, SIGNAL(triggered()),
             SLOT(createEntry()));
@@ -249,6 +251,12 @@ MainWindow::~MainWindow()
 {
 }
 
+void MainWindow::appExit()
+{
+    appExitCalled = true;
+    close();
+}
+
 void MainWindow::updateLastDatabasesMenu()
 {
     m_ui->menuRecentDatabases->clear();
@@ -462,6 +470,13 @@ void MainWindow::databaseTabChanged(int tabIndex)
 
 void MainWindow::closeEvent(QCloseEvent* event)
 {
+    if (config()->get("GUI/MinimizeOnClose").toBool() && !appExitCalled)
+    {
+        event->ignore();
+        hide();
+        return;
+    }
+
     bool accept = saveLastDatabases();
 
     if (accept) {

src/gui/MainWindow.h

@@ -65,6 +65,7 @@ private Q_SLOTS:
     void applySettingsChanges();
     void trayIconTriggered(QSystemTrayIcon::ActivationReason reason);
     void toggleWindow();
+    void appExit();
 
 private:
     static void setShortcut(QAction* action, QKeySequence::StandardKey standard, int fallback = 0);
@@ -87,6 +88,8 @@ private:
     QSystemTrayIcon* m_trayIcon;
 
     Q_DISABLE_COPY(MainWindow)
+
+    bool appExitCalled;
 };
 
 #endif // KEEPASSX_MAINWINDOW_H

src/gui/SettingsWidget.cpp

@@ -74,6 +74,8 @@ SettingsWidget::SettingsWidget(QWidget* parent)
             this, SLOT(enableAutoSaveOnExit(bool)));
     connect(m_generalUi->systrayShowCheckBox, SIGNAL(toggled(bool)),
             m_generalUi->systrayMinimizeToTrayCheckBox, SLOT(setEnabled(bool)));
+    connect(m_generalUi->systrayMinimizeToTrayCheckBox, SIGNAL(toggled(bool)),
+            m_generalUi->systrayMinimizeOnCloseCheckBox, SLOT(setEnabled(bool)));
 
     connect(m_secUi->clearClipboardCheckBox, SIGNAL(toggled(bool)),
             m_secUi->clearClipboardSpinBox, SLOT(setEnabled(bool)));
@@ -117,6 +119,7 @@ void SettingsWidget::loadSettings()
 
     m_generalUi->systrayShowCheckBox->setChecked(config()->get("GUI/ShowTrayIcon").toBool());
     m_generalUi->systrayMinimizeToTrayCheckBox->setChecked(config()->get("GUI/MinimizeToTray").toBool());
+    m_generalUi->systrayMinimizeOnCloseCheckBox->setChecked(config()->get("GUI/MinimizeOnClose").toBool());
 
     if (autoType()->isAvailable()) {
         m_globalAutoTypeKey = static_cast<Qt::Key>(config()->get("GlobalAutoTypeKey").toInt());
@@ -161,6 +164,7 @@ void SettingsWidget::saveSettings()
 
     config()->set("GUI/ShowTrayIcon", m_generalUi->systrayShowCheckBox->isChecked());
     config()->set("GUI/MinimizeToTray", m_generalUi->systrayMinimizeToTrayCheckBox->isChecked());
+    config()->set("GUI/MinimizeOnClose", m_generalUi->systrayMinimizeOnCloseCheckBox->isChecked());
 
     if (autoType()->isAvailable()) {
         config()->set("GlobalAutoTypeKey", m_generalUi->autoTypeShortcutWidget->key());

src/gui/SettingsWidgetGeneral.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>456</width>
-    <height>313</height>
+    <height>346</height>
    </rect>
   </property>
   <layout class="QFormLayout" name="formLayout">
@@ -113,6 +113,16 @@
      </property>
     </widget>
    </item>
+   <item row="12" column="0">
+    <widget class="QCheckBox" name="systrayMinimizeOnCloseCheckBox">
+     <property name="enabled">
+      <bool>false</bool>
+     </property>
+     <property name="text">
+      <string>Hide window to system tray instead of App Exit</string>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <customwidgets>