introduce the signal Corona::startupCompleted()

when emitted we are sure all containments *graphics objects*
 have been created

src/plasma/containment.cpp

@@ -526,7 +526,8 @@ QHash<QString, ContainmentActions*> &Containment::containmentActions()
 
 bool Containment::isUiReady() const
 {
-    return static_cast<const Applet *>(this)->d->uiReady;
+    const Applet *a = static_cast<const Applet *>(this);
+    return a->d->uiReady && a->d->started;
 }
 
 void Containment::setActivity(const QString &activityId)

src/plasma/corona.cpp

@@ -180,6 +180,11 @@ QList<Containment*> Corona::containments() const
     return d->containments;
 }
 
+bool Corona::isStartupCompleted() const
+{
+    return d->containmentsStarting <= 0;
+}
+
 KSharedConfigPtr Corona::config() const
 {
     if (!d->config) {
@@ -308,7 +313,8 @@ CoronaPrivate::CoronaPrivate(Corona *corona)
       immutability(Types::Mutable),
       config(0),
       configSyncTimer(new QTimer(corona)),
-      actions(corona)
+      actions(corona),
+      containmentsStarting(0)
 {
     //TODO: make Package path configurable
     KConfigGroup config(KSharedConfig::openConfig(), "General");
@@ -525,6 +531,22 @@ QList<Plasma::Containment *> CoronaPrivate::importLayout(const KConfigGroup &con
 #endif
     }
 
+    if (!mergeConfig) {
+        containmentsStarting = 0;
+        foreach (Containment *containment, containments) {
+            if (!containment->isUiReady() && containment->lastScreen() < q->numScreens()) {
+                ++containmentsStarting;
+                QObject::connect(containment, &Plasma::Containment::uiReadyChanged, [=](){
+                    --containmentsStarting;
+                    if (containmentsStarting <= 0) {
+                        qDebug() << "Corona Startup Completed";
+                        emit q->startupCompleted();
+                    }
+                });
+            }
+        }
+    }
+
     return newContainments;
 }
 

src/plasma/corona.h

@@ -68,6 +68,12 @@ public:
      */
     QList<Containment*> containments() const;
 
+    /**
+     * @returns true when the startup is over, and
+     * all the ui graphics has been instantiated
+     */
+    bool isStartupCompleted() const;
+
     /**
      * Returns the config file used to store the configuration for this Corona
      */
@@ -265,6 +271,11 @@ Q_SIGNALS:
      */
     void packageChanged(const Plasma::Package &package);
 
+    /**
+     * Emitted when the startup phase has been completed
+     */
+    void startupCompleted();
+
 protected:
     /**
      * Loads the default (system wide) layout for this user

src/plasma/plasma.h

@@ -55,7 +55,7 @@ enum Constraint {
     ContextConstraint = 32, /**< the context (e.g. activity) has changed */
     UiReadyConstraint = 64, /** The ui has been completely loaded (FIXME: merged with StartupCompletedConstraint?) */
     AllConstraints = FormFactorConstraint | LocationConstraint | ScreenConstraint |
-    ImmutableConstraint | UiReadyConstraint
+    ImmutableConstraint
 };
 Q_ENUMS(Constraint)
 Q_DECLARE_FLAGS(Constraints, Constraint)

src/plasma/private/applet_p.cpp

@@ -298,20 +298,23 @@ void AppletPrivate::setUiReady()
 {
     //am i the containment?
     Containment *c = qobject_cast<Containment *>(q);
-    if (c) {
+    if (c && c->isContainment()) {
         //if we are the containment and there is still some uncomplete applet, we're still incomplete
         if (!c->d->loadingApplets.isEmpty()) {
             return;
-        } else if (!uiReady) {
+        } else if (!uiReady && started) {
             emit c->uiReadyChanged(true);
         }
     } else {
         c = q->containment();
         if (c) {
             q->containment()->d->loadingApplets.remove(q);
-            if (q->containment()->d->loadingApplets.isEmpty() && !static_cast<Applet *>(q->containment())->d->uiReady) {
-                static_cast<Applet *>(q->containment())->d->uiReady = true;
-                emit q->containment()->uiReadyChanged(true);
+            Applet *a = static_cast<Applet *>(q->containment());
+            if (q->containment()->d->loadingApplets.isEmpty() && !a->d->uiReady) {
+                a->d->uiReady = true;
+                if (a->d->started) {
+                    emit q->containment()->uiReadyChanged(true);
+                }
             }
         }
     }
@@ -362,6 +365,9 @@ void AppletPrivate::scheduleConstraintsUpdate(Plasma::Types::Constraints c)
 
     if (c & Plasma::Types::StartupCompletedConstraint) {
         started = true;
+        if (uiReady) {
+            emit q->containment()->uiReadyChanged(true);
+        }
     }
 
     pendingConstraints |= c;

src/plasma/private/corona_p.h

@@ -57,6 +57,7 @@ public:
     QTimer *configSyncTimer;
     QList<Containment*> containments;
     KActionCollection actions;
+    int containmentsStarting;
 };
 
 }