[server] Add Display::seats() -> QVector<SeatInterface*>

Similar to OutputInterfaces we can have multiple SeatInterfaces so
expose a way to get to all SeatInterfaces.

REVIEW: 126364

src/wayland/autotests/server/test_seat.cpp

@@ -37,6 +37,7 @@ private Q_SLOTS:
     void testPointerPos();
     void testDestroyThroughTerminate();
     void testRepeatInfo();
+    void testMultiple();
 };
 
 static const QString s_socketName = QStringLiteral("kwin-wayland-server-seat-test-0");
@@ -197,5 +198,37 @@ void TestWaylandServerSeat::testRepeatInfo()
     QCOMPARE(seat->keyRepeatDelay(), 0);
 }
 
+void TestWaylandServerSeat::testMultiple()
+{
+    Display display;
+    display.setSocketName(s_socketName);
+    display.start();
+    QVERIFY(display.seats().isEmpty());
+    SeatInterface *seat1 = display.createSeat();
+    QCOMPARE(display.seats().count(), 1);
+    QCOMPARE(display.seats().at(0), seat1);
+    SeatInterface *seat2 = display.createSeat();
+    QCOMPARE(display.seats().count(), 2);
+    QCOMPARE(display.seats().at(0), seat1);
+    QCOMPARE(display.seats().at(1), seat2);
+    SeatInterface *seat3 = display.createSeat();
+    QCOMPARE(display.seats().count(), 3);
+    QCOMPARE(display.seats().at(0), seat1);
+    QCOMPARE(display.seats().at(1), seat2);
+    QCOMPARE(display.seats().at(2), seat3);
+
+    delete seat3;
+    QCOMPARE(display.seats().count(), 2);
+    QCOMPARE(display.seats().at(0), seat1);
+    QCOMPARE(display.seats().at(1), seat2);
+
+    delete seat2;
+    QCOMPARE(display.seats().count(), 1);
+    QCOMPARE(display.seats().at(0), seat1);
+
+    delete seat1;
+    QCOMPARE(display.seats().count(), 0);
+}
+
 QTEST_GUILESS_MAIN(TestWaylandServerSeat)
 #include "test_seat.moc"

src/wayland/display.cpp

@@ -69,6 +69,7 @@ public:
     bool running = false;
     QList<OutputInterface*> outputs;
     QList<OutputDeviceInterface*> outputdevices;
+    QVector<SeatInterface*> seats;
     QVector<ClientConnection*> clients;
     EGLDisplay eglDisplay = EGL_NO_DISPLAY;
 
@@ -235,7 +236,9 @@ OutputManagementInterface *Display::createOutputManagement(QObject *parent)
 SeatInterface *Display::createSeat(QObject *parent)
 {
     SeatInterface *seat = new SeatInterface(this, parent);
+    connect(seat, &QObject::destroyed, this, [this, seat] { d->seats.removeAll(seat); });
     connect(this, &Display::aboutToTerminate, seat, [this,seat] { delete seat; });
+    d->seats << seat;
     return seat;
 }
 
@@ -376,6 +379,11 @@ QList< OutputDeviceInterface* > Display::outputDevices() const
     return d->outputdevices;
 }
 
+QVector<SeatInterface*> Display::seats() const
+{
+    return d->seats;
+}
+
 ClientConnection *Display::getConnection(wl_client *client)
 {
     Q_ASSERT(client);

src/wayland/display.h

@@ -147,6 +147,11 @@ public:
     void createShm();
     ShellInterface *createShell(QObject *parent = nullptr);
     SeatInterface *createSeat(QObject *parent = nullptr);
+    /**
+     * @returns All SeatInterface currently managed on the Display.
+     * @since 5.6
+     **/
+    QVector<SeatInterface*> seats() const;
     SubCompositorInterface *createSubCompositor(QObject *parent = nullptr);
     DataDeviceManagerInterface *createDataDeviceManager(QObject *parent = nullptr);
     OutputManagementInterface *createOutputManagement(QObject *parent = nullptr);