Remove selectionCleared and sendClearSelection from datadevice and friends

Having both selectionChanged and selectionCleared as well as
sendSelection and sendClearSelection complicates things. API users
have to connect to both signals, internally the methods have logic
to call themselves but in the end do the same as the protocols only
know send_selection.

src/wayland/autotests/client/test_datadevice.cpp

@@ -371,13 +371,11 @@ void TestDataDevice::testSetSelection()
 
     // everything setup, now we can test setting the selection
     QSignalSpy selectionChangedSpy(deviceInterface, &KWaylandServer::DataDeviceInterface::selectionChanged);
-    QSignalSpy selectionClearedSpy(deviceInterface, &KWaylandServer::DataDeviceInterface::selectionCleared);
 
     QVERIFY(!deviceInterface->selection());
     dataDevice->setSelection(1, dataSource.get());
     QVERIFY(selectionChangedSpy.wait());
     QCOMPARE(selectionChangedSpy.count(), 1);
-    QCOMPARE(selectionClearedSpy.count(), 0);
     QCOMPARE(selectionChangedSpy.first().first().value<DataSourceInterface *>(), sourceInterface);
     QCOMPARE(deviceInterface->selection(), sourceInterface);
 
@@ -403,9 +401,8 @@ void TestDataDevice::testSetSelection()
 
     // now clear the selection
     dataDevice->clearSelection(1);
-    QVERIFY(selectionClearedSpy.wait());
-    QCOMPARE(selectionChangedSpy.count(), 1);
-    QCOMPARE(selectionClearedSpy.count(), 1);
+    QVERIFY(selectionChangedSpy.wait());
+    QCOMPARE(selectionChangedSpy.count(), 2);
     QVERIFY(!deviceInterface->selection());
 
     // set another selection

src/wayland/datacontroldevice_v1_interface.cpp

@@ -137,38 +137,13 @@ DataControlSourceV1Interface *DataControlDeviceV1Interface::primarySelection() c
 
 void DataControlDeviceV1Interface::sendSelection(AbstractDataSource *other)
 {
-    if (!other) {
-        sendClearSelection();
-        return;
-    }
     DataControlOfferV1Interface *offer = d->createDataOffer(other);
-    if (!offer) {
-        return;
-    }
-    d->send_selection(offer->resource());
-}
-
-void DataControlDeviceV1Interface::sendClearSelection()
-{
-    d->send_selection(nullptr);
+    d->send_selection(offer ? offer->resource() : nullptr);
 }
 
 void DataControlDeviceV1Interface::sendPrimarySelection(KWaylandServer::AbstractDataSource *other)
 {
-    if (!other) {
-        sendClearPrimarySelection();
-        return;
-    }
     DataControlOfferV1Interface *offer = d->createDataOffer(other);
-    if (!offer) {
-        return;
-    }
-    d->send_primary_selection(offer->resource());
+    d->send_primary_selection(offer ? offer->resource() : nullptr);
 }
-
-void DataControlDeviceV1Interface::sendClearPrimarySelection()
-{
-    d->send_primary_selection(nullptr);
-}
-
 }

src/wayland/datacontroldevice_v1_interface.h

@@ -39,14 +39,11 @@ public:
     DataControlSourceV1Interface *primarySelection() const;
 
     void sendSelection(AbstractDataSource *other);
-    void sendClearSelection();
 
     void sendPrimarySelection(AbstractDataSource *other);
-    void sendClearPrimarySelection();
 
 Q_SIGNALS:
     void selectionChanged(KWaylandServer::DataControlSourceV1Interface *dataSource);
-    void selectionCleared();
 
     void primarySelectionChanged(KWaylandServer::DataControlSourceV1Interface *dataSource);
 

src/wayland/datadevice_interface.cpp

@@ -126,11 +126,7 @@ void DataDeviceInterfacePrivate::data_device_set_selection(Resource *resource, w
         selection->cancel();
     }
     selection = dataSource;
-    if (selection) {
-        Q_EMIT q->selectionChanged(selection);
-    } else {
-        Q_EMIT q->selectionCleared();
-    }
+    Q_EMIT q->selectionChanged(selection);
 }
 
 void DataDeviceInterfacePrivate::data_device_release(QtWaylandServer::wl_data_device::Resource *resource)
@@ -186,16 +182,8 @@ DataSourceInterface *DataDeviceInterface::selection() const
 
 void DataDeviceInterface::sendSelection(AbstractDataSource *other)
 {
-    auto r = d->createDataOffer(other);
-    if (!r) {
-        return;
-    }
-    d->send_selection(r->resource());
-}
-
-void DataDeviceInterface::sendClearSelection()
-{
-    d->send_selection(nullptr);
+    auto r = other ? d->createDataOffer(other) : nullptr;
+    d->send_selection(r ? r->resource() : nullptr);
 }
 
 void DataDeviceInterface::drop()

src/wayland/datadevice_interface.h

@@ -79,7 +79,6 @@ public:
     DataSourceInterface *selection() const;
 
     void sendSelection(KWaylandServer::AbstractDataSource *other);
-    void sendClearSelection();
     /**
      * The event is sent when a drag-and-drop operation is ended because the implicit grab is removed.
      */
@@ -103,7 +102,6 @@ Q_SIGNALS:
     void aboutToBeDestroyed();
     void dragStarted(AbstractDataSource *source, SurfaceInterface *originSurface, quint32 serial, DragAndDropIcon *dragIcon);
     void selectionChanged(KWaylandServer::DataSourceInterface *);
-    void selectionCleared();
 
 private:
     friend class DataDeviceManagerInterfacePrivate;

src/wayland/primaryselectiondevice_v1_interface.cpp

@@ -118,20 +118,8 @@ PrimarySelectionSourceV1Interface *PrimarySelectionDeviceV1Interface::selection(
 
 void PrimarySelectionDeviceV1Interface::sendSelection(AbstractDataSource *other)
 {
-    if (!other) {
-        sendClearSelection();
-        return;
-    }
     PrimarySelectionOfferV1Interface *offer = d->createDataOffer(other);
-    if (!offer) {
-        return;
-    }
-    d->send_selection(offer->resource());
-}
-
-void PrimarySelectionDeviceV1Interface::sendClearSelection()
-{
-    d->send_selection(nullptr);
+    d->send_selection(offer ? offer->resource() : nullptr);
 }
 
 wl_client *PrimarySelectionDeviceV1Interface::client() const

src/wayland/primaryselectiondevice_v1_interface.h

@@ -41,13 +41,11 @@ public:
     PrimarySelectionSourceV1Interface *selection() const;
 
     void sendSelection(AbstractDataSource *other);
-    void sendClearSelection();
 
     wl_client *client() const;
 
 Q_SIGNALS:
     void selectionChanged(KWaylandServer::PrimarySelectionSourceV1Interface *);
-    void selectionCleared();
 
 private:
     friend class PrimarySelectionDeviceManagerV1InterfacePrivate;

src/wayland/seat_interface.cpp

@@ -165,9 +165,6 @@ void SeatInterfacePrivate::registerDataDevice(DataDeviceInterface *dataDevice)
     QObject::connect(dataDevice, &DataDeviceInterface::selectionChanged, q, [this, dataDevice] {
         updateSelection(dataDevice);
     });
-    QObject::connect(dataDevice, &DataDeviceInterface::selectionCleared, q, [this, dataDevice] {
-        updateSelection(dataDevice);
-    });
     QObject::connect(dataDevice,
                      &DataDeviceInterface::dragStarted,
                      q,
@@ -223,10 +220,6 @@ void SeatInterfacePrivate::registerDataControlDevice(DataControlDeviceV1Interfac
         q->setSelection(dataDevice->selection());
     });
 
-    QObject::connect(dataDevice, &DataControlDeviceV1Interface::selectionCleared, q, [this, dataDevice] {
-        q->setSelection(nullptr);
-    });
-
     QObject::connect(dataDevice, &DataControlDeviceV1Interface::primarySelectionChanged, q, [this, dataDevice] {
         // Special klipper workaround to avoid a race
         // If the mimetype x-kde-onlyReplaceEmpty is set, and we've had another update in the meantime, do nothing
@@ -260,9 +253,6 @@ void SeatInterfacePrivate::registerPrimarySelectionDevice(PrimarySelectionDevice
     QObject::connect(primarySelectionDevice, &PrimarySelectionDeviceV1Interface::selectionChanged, q, [this, primarySelectionDevice] {
         updatePrimarySelection(primarySelectionDevice);
     });
-    QObject::connect(primarySelectionDevice, &PrimarySelectionDeviceV1Interface::selectionCleared, q, [this, primarySelectionDevice] {
-        updatePrimarySelection(primarySelectionDevice);
-    });
     // is the new DataDevice for the current keyoard focus?
     if (globalKeyboard.focus.surface) {
         // same client?
@@ -937,11 +927,7 @@ void SeatInterface::setFocusedKeyboardSurface(SurfaceInterface *surface)
         const QVector<DataDeviceInterface *> dataDevices = d->dataDevicesForSurface(surface);
         d->globalKeyboard.focus.selections = dataDevices;
         for (auto dataDevice : dataDevices) {
-            if (d->currentSelection) {
-                dataDevice->sendSelection(d->currentSelection);
-            } else {
-                dataDevice->sendClearSelection();
-            }
+            dataDevice->sendSelection(d->currentSelection);
         }
         // primary selection
         QVector<PrimarySelectionDeviceV1Interface *> primarySelectionDevices;
@@ -953,11 +939,7 @@ void SeatInterface::setFocusedKeyboardSurface(SurfaceInterface *surface)
 
         d->globalKeyboard.focus.primarySelections = primarySelectionDevices;
         for (auto primaryDataDevice : primarySelectionDevices) {
-            if (d->currentPrimarySelection) {
-                primaryDataDevice->sendSelection(d->currentPrimarySelection);
-            } else {
-                primaryDataDevice->sendClearSelection();
-            }
+            primaryDataDevice->sendSelection(d->currentPrimarySelection);
         }
     }
 
@@ -1293,19 +1275,11 @@ void SeatInterface::setSelection(AbstractDataSource *selection)
     d->currentSelection = selection;
 
     for (auto focussedSelection : std::as_const(d->globalKeyboard.focus.selections)) {
-        if (selection) {
-            focussedSelection->sendSelection(selection);
-        } else {
-            focussedSelection->sendClearSelection();
-        }
+        focussedSelection->sendSelection(selection);
     }
 
     for (auto control : std::as_const(d->dataControlDevices)) {
-        if (selection) {
-            control->sendSelection(selection);
-        } else {
-            control->sendClearSelection();
-        }
+        control->sendSelection(selection);
     }
 
     Q_EMIT selectionChanged(selection);
@@ -1351,18 +1325,10 @@ void SeatInterface::setPrimarySelection(AbstractDataSource *selection)
     d->currentPrimarySelection = selection;
 
     for (auto focussedSelection : std::as_const(d->globalKeyboard.focus.primarySelections)) {
-        if (selection) {
-            focussedSelection->sendSelection(selection);
-        } else {
-            focussedSelection->sendClearSelection();
-        }
+        focussedSelection->sendSelection(selection);
     }
     for (auto control : std::as_const(d->dataControlDevices)) {
-        if (selection) {
-            control->sendPrimarySelection(selection);
-        } else {
-            control->sendClearPrimarySelection();
-        }
+        control->sendPrimarySelection(selection);
     }
 
     Q_EMIT primarySelectionChanged(selection);