diff --git a/libkwineffects/anidata.cpp b/libkwineffects/anidata.cpp
index f1a07d46cb..cc0d872e7f 100644
--- a/libkwineffects/anidata.cpp
+++ b/libkwineffects/anidata.cpp
@@ -30,11 +30,11 @@ AniData::AniData()
     attribute = AnimationEffect::Opacity;
     windowType = (NET::WindowTypeMask)0;
     duration = time = meta = startTime = 0;
-    waitAtSource = false;
+    waitAtSource = keepAtTarget = false;
 }
 
 AniData::AniData(AnimationEffect::Attribute a, int meta, int ms, const FPx2 &to,
-                 QEasingCurve curve, int delay, const FPx2 &from, bool waitAtSource )
+                 QEasingCurve curve, int delay, const FPx2 &from, bool waitAtSource, bool keepAtTarget )
 {
     attribute = a;
     this->from = from;
@@ -44,6 +44,7 @@ AniData::AniData(AnimationEffect::Attribute a, int meta, int ms, const FPx2 &to,
     time = 0;
     this->meta = meta;
     this->waitAtSource = waitAtSource;
+    this->keepAtTarget = keepAtTarget;
     startTime = AnimationEffect::clock() + delay;
 }
 
@@ -58,6 +59,8 @@ AniData::AniData(const AniData &other)
     customCurve = other.customCurve;
     windowType = other.windowType;
     meta = other.meta;
+    waitAtSource = other.waitAtSource;
+    keepAtTarget = other.keepAtTarget;
     startTime = other.startTime;
 }
 
diff --git a/libkwineffects/anidata_p.h b/libkwineffects/anidata_p.h
index a0c450bc0a..b2c704912c 100644
--- a/libkwineffects/anidata_p.h
+++ b/libkwineffects/anidata_p.h
@@ -31,7 +31,7 @@ class AniData {
 public:
     AniData();
     AniData(AnimationEffect::Attribute a, int meta, int ms, const FPx2 &to,
-            QEasingCurve curve, int delay, const FPx2 &from, bool waitAtSource );
+            QEasingCurve curve, int delay, const FPx2 &from, bool waitAtSource, bool keepAtTarget = false);
     AniData(const AniData &other);
     explicit AniData(const QString &str);
     inline void addTime(int t) { time += t; }
@@ -48,7 +48,7 @@ public:
     uint meta;
     qint64 startTime;
     NET::WindowTypeMask windowType;
-    bool waitAtSource;
+    bool waitAtSource, keepAtTarget;
 };
 
 } // namespace
diff --git a/libkwineffects/kwinanimationeffect.cpp b/libkwineffects/kwinanimationeffect.cpp
index 9709be4517..f2b55d0508 100644
--- a/libkwineffects/kwinanimationeffect.cpp
+++ b/libkwineffects/kwinanimationeffect.cpp
@@ -74,7 +74,7 @@ bool AnimationEffect::isActive() const
 #define RELATIVE_XY(_FIELD_) const bool relative[2] = { static_cast<bool>(metaData(Relative##_FIELD_##X, meta)), \
                                                         static_cast<bool>(metaData(Relative##_FIELD_##Y, meta)) }
 
-void AnimationEffect::animate( EffectWindow *w, Attribute a, uint meta, int ms, FPx2 to, QEasingCurve curve, int delay, FPx2 from )
+quint64 AnimationEffect::p_animate( EffectWindow *w, Attribute a, uint meta, int ms, FPx2 to, QEasingCurve curve, int delay, FPx2 from, bool keepAtTarget )
 {
     const bool waitAtSource = from.isValid();
     if (a < NonFloatBase) {
@@ -179,7 +179,8 @@ void AnimationEffect::animate( EffectWindow *w, Attribute a, uint meta, int ms,
     AniMap::iterator it = d->m_animations.find(w);
     if (it == d->m_animations.end())
         it = d->m_animations.insert(w, QPair<QList<AniData>, QRect>(QList<AniData>(), QRect()));
-    it->first.append(AniData(a, meta, ms, to, curve, delay, from, waitAtSource));
+    it->first.append(AniData(a, meta, ms, to, curve, delay, from, waitAtSource, keepAtTarget));
+    quint64 ret_id = quint64(&it->first.last());
     it->second = QRect();
 
     d->m_animationsTouched = true;
@@ -192,6 +193,29 @@ void AnimationEffect::animate( EffectWindow *w, Attribute a, uint meta, int ms,
     else {
         triggerRepaint();
     }
+    return ret_id;
+}
+
+bool AnimationEffect::cancel(quint64 animationId)
+{
+    Q_D(AnimationEffect);
+    for (AniMap::iterator entry = d->m_animations.begin(), mapEnd = d->m_animations.end(); entry != mapEnd; ++entry) {
+        for (QList<AniData>::iterator anim = entry->first.begin(), animEnd = entry->first.end(); anim != animEnd; ++anim) {
+            if (quint64(&(*anim)) == animationId) {
+                entry->first.erase(anim); // remove the animation
+                if (entry->first.isEmpty()) { // no other animations on the window, release it.
+                    const int i = d->m_zombies.indexOf(entry.key());
+                    if ( i > -1 ) {
+                        d->m_zombies.removeAt( i );
+                        entry.key()->unrefWindow();
+                    }
+                    d->m_animations.erase(entry);
+                }
+                return true;
+            }
+        }
+    }
+    return false;
 }
 
 void AnimationEffect::prePaintScreen( ScreenPrePaintData& data, int time )
@@ -221,7 +245,7 @@ void AnimationEffect::prePaintScreen( ScreenPrePaintData& data, int time )
                 anim->addTime(time);
             }
 
-            if (anim->time < anim->duration) {
+            if (anim->time < anim->duration || anim->keepAtTarget) {
 //                 if (anim->attribute != Brightness && anim->attribute != Saturation && anim->attribute != Opacity)
 //                     transformed = true;
                 d->m_animated = true;
@@ -540,14 +564,18 @@ float AnimationEffect::interpolated( const AniData &a, int i ) const
 {
     if (a.startTime > clock())
         return a.from[i];
-    return a.from[i] + a.curve.valueForProgress( ((float)a.time)/a.duration )*(a.to[i] - a.from[i]);
+    if (a.time < a.duration)
+        return a.from[i] + a.curve.valueForProgress( ((float)a.time)/a.duration )*(a.to[i] - a.from[i]);
+    return a.to[i]; // we're done and "waiting" at the target value
 }
 
 float AnimationEffect::progress( const AniData &a ) const
 {
     if (a.startTime > clock())
         return 0.0;
-    return a.curve.valueForProgress( ((float)a.time)/a.duration );
+    if (a.time < a.duration)
+        return a.curve.valueForProgress( ((float)a.time)/a.duration );
+    return 1.0; // we're done and "waiting" at the target value
 }
 
 
diff --git a/libkwineffects/kwinanimationeffect.h b/libkwineffects/kwinanimationeffect.h
index d7b6722055..09ff09cb71 100644
--- a/libkwineffects/kwinanimationeffect.h
+++ b/libkwineffects/kwinanimationeffect.h
@@ -155,13 +155,32 @@ protected:
      * @param shape - How the animation progresses, eg. Linear progresses constantly while Exponential start slow and becomes very fast in the end
      * @param delay - When the animation will start compared to "now" (the window will remain at the "from" position until then)
      * @param from - the starting value, the default is invalid, ie. the attribute for the window is not transformed in the beginning
+     * @return an ID that you can use to cancel a running animation
      */
-    void animate( EffectWindow *w, Attribute a, uint meta, int ms, FPx2 to, QEasingCurve curve = QEasingCurve(), int delay = 0, FPx2 from = FPx2() );
+    quint64 animate( EffectWindow *w, Attribute a, uint meta, int ms, FPx2 to, QEasingCurve curve = QEasingCurve(), int delay = 0, FPx2 from = FPx2() )
+    { return p_animate(w, a, meta, ms, to, curve, delay, from, false); }
+
+    /**
+     * Equal to ::animate() with one important difference:
+     * The target value for the attribute is kept until you ::cancel() this animation
+     * @return an ID that you need to use to cancel this manipulation
+     */
+    quint64 set( EffectWindow *w, Attribute a, uint meta, int ms, FPx2 to, QEasingCurve curve = QEasingCurve(), int delay = 0, FPx2 from = FPx2() )
+    { return p_animate(w, a, meta, ms, to, curve, delay, from, true); }
+
     /**
      * Called whenever an animation end, passes the transformed @class EffectWindow @enum Attribute and originally supplied @param meta
      * You can reimplement it to keep a constant transformation for the window (ie. keep it a this opacity or position) or to start another animation
      */
     virtual void animationEnded( EffectWindow *, Attribute, uint meta ) {Q_UNUSED(meta);}
+
+    /**
+     * Cancel a running animation. @return true if an animation for @p animationId was found (and canceled)
+     * NOTICE that there is NO animated reset of the original value. You'll have to provide that with a second animation
+     * NOTICE as well that this will eventually release a Deleted window.
+     * If you intend to run another animation on the (Deleted) window, you have to do that before cancelling the old animation (to keep the window around)
+     */
+    bool cancel(quint64 animationId);
     /**
      * Called if the transformed @enum Attribute is Generic. You should reimplement it if you transform this "Attribute".
      * You could use the meta information to eg. support more than one additional animations
@@ -170,6 +189,7 @@ protected:
     {Q_UNUSED(w); Q_UNUSED(data); Q_UNUSED(progress); Q_UNUSED(meta);}
 
 private:
+    quint64 p_animate( EffectWindow *w, Attribute a, uint meta, int ms, FPx2 to, QEasingCurve curve, int delay, FPx2 from, bool keepAtTarget );
     QRect clipRect(const QRect &windowRect, const AniData&) const;
     void clipWindow(const EffectWindow *, const AniData &, WindowQuadList &) const;
     float interpolated( const AniData&, int i = 0 ) const;
diff --git a/libkwineffects/kwineffects.h b/libkwineffects/kwineffects.h
index 79901ecd59..7aee5568e5 100644
--- a/libkwineffects/kwineffects.h
+++ b/libkwineffects/kwineffects.h
@@ -170,7 +170,7 @@ X-KDE-Library=kwin4_effect_cooleffect
 
 #define KWIN_EFFECT_API_MAKE_VERSION( major, minor ) (( major ) << 8 | ( minor ))
 #define KWIN_EFFECT_API_VERSION_MAJOR 0
-#define KWIN_EFFECT_API_VERSION_MINOR 220
+#define KWIN_EFFECT_API_VERSION_MINOR 221
 #define KWIN_EFFECT_API_VERSION KWIN_EFFECT_API_MAKE_VERSION( \
         KWIN_EFFECT_API_VERSION_MAJOR, KWIN_EFFECT_API_VERSION_MINOR )