diff --git a/imports/activitymanager/CMakeLists.txt b/imports/activitymanager/CMakeLists.txt
--- a/imports/activitymanager/CMakeLists.txt
+++ b/imports/activitymanager/CMakeLists.txt
@@ -43,6 +43,7 @@
    KF5::KIOCore
    KF5::KIOWidgets
    KF5::WindowSystem
+   PW::LibTaskManager
    ${X11_X11_LIB}
    )
 
diff --git a/imports/activitymanager/switcherbackend.h b/imports/activitymanager/switcherbackend.h
--- a/imports/activitymanager/switcherbackend.h
+++ b/imports/activitymanager/switcherbackend.h
@@ -53,6 +53,8 @@
 
     static QObject *instance(QQmlEngine *engine, QJSEngine *scriptEngine);
 
+    Q_INVOKABLE void drop(QMimeData *, int modifiers, const QVariant &itemId);
+
 Q_SIGNALS:
     void showSwitchNotification(const QString &id, const QString &name, const QString &icon);
     void shouldShowSwitcherChanged(bool value);
diff --git a/imports/activitymanager/switcherbackend.cpp b/imports/activitymanager/switcherbackend.cpp
--- a/imports/activitymanager/switcherbackend.cpp
+++ b/imports/activitymanager/switcherbackend.cpp
@@ -28,6 +28,7 @@
 #include <QX11Info>
 #include <QTimer>
 #include <QDateTime>
+#include <QMimeData>
 
 // Qml and QtQuick
 #include <QQuickImageProvider>
@@ -39,6 +40,9 @@
 #include <KIO/PreviewJob>
 #include <KConfig>
 #include <KConfigGroup>
+#include <KWindowSystem>
+#include <windowtasksmodel.h>
+#include <xwindowtasksmodel.h>
 
 // X11
 #include <X11/keysym.h>
@@ -392,6 +396,48 @@
     m_previousActivity = id;
 }
 
+void SwitcherBackend::drop(QMimeData * mimeData, int modifiers, const QVariant &itemId)
+{
+    qDebug() << "SwitcherBackend::drop()";
+    if (!mimeData) {
+        return;
+    }
+#if HAVE_X11
+    if (KWindowSystem::isPlatformX11()) {
+        bool ok;
+
+        const QList<WId> &ids = TaskManager::XWindowTasksModel::winIdsFromMimeData(mimeData, &ok);
+
+        if (!ok) {
+            return;
+        }
+
+        QString newActivity = itemId.toString();
+        const QStringList &runningActivities = m_activities.runningActivities();
+
+        if (!runningActivities.contains(newActivity)) {
+            return;
+        }
+
+        for (const auto &id : ids) {
+            QStringList activities = KWindowInfo(id, NET::Properties(), NET::WM2Activities).activities();
+
+            if (modifiers & Qt::ControlModifier) { // 'copy' => add to activity
+                if (!activities.contains(newActivity))
+                    activities << newActivity;
+            } else { // 'move' to activity
+                // if on only one activity, set it to only the new activity
+                // if on >1 activity, remove it from the current activity and add it to the new activity
+                const QString currentActivity = m_activities.currentActivity();
+                activities.removeAll(currentActivity);
+                activities << newActivity;
+            }
+            KWindowSystem::setOnActivities(id, activities);
+        }
+    }
+#endif
+}
+
 bool SwitcherBackend::shouldShowSwitcher() const
 {
     return m_shouldShowSwitcher;