Index: decorations/decoratedclient.h
===================================================================
--- decorations/decoratedclient.h
+++ decorations/decoratedclient.h
@@ -72,6 +72,8 @@
     bool hasApplicationMenu() const override;
     bool isApplicationMenuActive() const override;
 
+    void requestShowToolTip(const QString &text) override;
+    void requestHideToolTip() override;
     void requestClose() override;
     void requestContextHelp() override;
     void requestToggleMaximization(Qt::MouseButtons buttons) override;
Index: decorations/decoratedclient.cpp
===================================================================
--- decorations/decoratedclient.cpp
+++ decorations/decoratedclient.cpp
@@ -31,6 +31,7 @@
 #include <KDecoration2/Decoration>
 
 #include <QDebug>
+#include <QToolTip>
 
 namespace KWin
 {
@@ -200,6 +201,17 @@
     return QColor();
 }
 
+void DecoratedClientImpl::requestShowToolTip(const QString &text)
+{
+    QPoint pos = Cursor::pos();
+    QToolTip::showText(pos, text);
+}
+
+void DecoratedClientImpl::requestHideToolTip()
+{
+    QToolTip::hideText();
+}
+
 void DecoratedClientImpl::requestShowWindowMenu()
 {
     // TODO: add rect to requestShowWindowMenu
Index: kcmkwin/kwindecoration/declarative-plugin/previewclient.h
===================================================================
--- kcmkwin/kwindecoration/declarative-plugin/previewclient.h
+++ kcmkwin/kwindecoration/declarative-plugin/previewclient.h
@@ -100,6 +100,8 @@
     bool hasApplicationMenu() const override;
     bool isApplicationMenuActive() const override;
 
+    void requestShowToolTip(const QString &text) override;
+    void requestHideToolTip() override;
     void requestClose() override;
     void requestContextHelp() override;
     void requestToggleMaximization(Qt::MouseButtons buttons) override;
Index: kcmkwin/kwindecoration/declarative-plugin/previewclient.cpp
===================================================================
--- kcmkwin/kwindecoration/declarative-plugin/previewclient.cpp
+++ kcmkwin/kwindecoration/declarative-plugin/previewclient.cpp
@@ -375,6 +375,16 @@
     emit bordersTopEdgeChanged(enabled);
 }
 
+void PreviewClient::requestShowToolTip(const QString &text)
+{
+    qDebug() << "tooltip show requested with text:" << text;
+}
+
+void PreviewClient::requestHideToolTip()
+{
+    qDebug() << "tooltip hide requested";
+}
+
 void PreviewClient::requestClose()
 {
     emit closeRequested();