allow applets to know when they are destroyed

svn path=/trunk/KDE/kdelibs/; revision=891035

applet.cpp

@@ -371,6 +371,11 @@ void Applet::destroy()
     }
 }
 
+bool Applet::destroyed() const
+{
+    return d->transient;
+}
+
 void AppletPrivate::appletAnimationComplete(QGraphicsItem *item, Plasma::Animator::Animation anim)
 {
     if (anim != Animator::DisappearAnimation || item != q) {

applet.h

@@ -550,6 +550,12 @@ class PLASMA_EXPORT Applet : public QGraphicsWidget
                         const QString &serviceId = QString(),
                         uint appletId = 0);
 
+        /**
+         * @return true if destroy() was called; useful for Applets which should avoid
+         * certain tasks if they are about to be deleted permanently
+         */
+        bool destroyed() const;
+
     Q_SIGNALS:
         /**
          * This signal indicates that an application launch, window