misc: make the last window closing not quit by default

src/core/main.cpp

@@ -252,6 +252,7 @@ int main(int argc, char** argv) {
 	QQuickWindow::setDefaultAlphaBuffer(true);
 
 	auto root = RootWrapper(configFilePath);
+	QGuiApplication::setQuitOnLastWindowClosed(false);
 
 	return QGuiApplication::exec();
 }

src/core/qmlglobal.cpp

@@ -20,6 +20,15 @@
 #include "qmlscreen.hpp"
 #include "rootwrapper.hpp"
 
+QuickshellSettings::QuickshellSettings() {
+	QObject::connect(
+	    static_cast<QGuiApplication*>(QGuiApplication::instance()), // NOLINT
+	    &QGuiApplication::lastWindowClosed,
+	    this,
+	    &QuickshellSettings::lastWindowClosed
+	);
+}
+
 QuickshellSettings* QuickshellSettings::instance() {
 	static QuickshellSettings* instance = nullptr; // NOLINT
 	if (instance == nullptr) {
@@ -52,6 +61,7 @@ QuickshellGlobal::QuickshellGlobal(QObject* parent): QObject(parent) {
 	// clang-format off
 	QObject::connect(QuickshellSettings::instance(), &QuickshellSettings::workingDirectoryChanged, this, &QuickshellGlobal::workingDirectoryChanged);
 	QObject::connect(QuickshellSettings::instance(), &QuickshellSettings::watchFilesChanged, this, &QuickshellGlobal::watchFilesChanged);
+	QObject::connect(QuickshellSettings::instance(), &QuickshellSettings::lastWindowClosed, this, &QuickshellGlobal::lastWindowClosed);
 	// clang-format on
 
 	auto* app = QCoreApplication::instance();

src/core/qmlglobal.hpp

@@ -26,16 +26,26 @@ class QuickshellSettings: public QObject {
 	QML_UNCREATABLE("singleton");
 
 public:
+	QuickshellSettings();
+
 	[[nodiscard]] QString workingDirectory() const;
 	void setWorkingDirectory(QString workingDirectory);
 
 	[[nodiscard]] bool watchFiles() const;
 	void setWatchFiles(bool watchFiles);
 
+	[[nodiscard]] bool quitOnLastClosed() const;
+	void setQuitOnLastClosed(bool exitOnLastClosed);
+
 	static QuickshellSettings* instance();
 	static void reset();
 
 signals:
+	/// Sent when the last window is closed.
+	///
+	/// To make the application exit when the last window is closed run `Qt.quit()`.
+	void lastWindowClosed();
+
 	void workingDirectoryChanged();
 	void watchFilesChanged();
 
@@ -105,6 +115,11 @@ public:
 	void setWatchFiles(bool watchFiles);
 
 signals:
+	/// Sent when the last window is closed.
+	///
+	/// To make the application exit when the last window is closed run `Qt.quit()`.
+	void lastWindowClosed();
+
 	void screensChanged();
 	void workingDirectoryChanged();
 	void watchFilesChanged();