stuff that lets me move "add activity" to plasmaapp:

-added enableAction function to corona for convenience
-added immutabilityChanged signal so that plasmaapp can respond to lock/unlock
-removed "add activity" action from containment because it's on its way to plasmaapp
-stopped adding corona actions to the containment toolbox, plasmaapp can do a better job of it
-made lock action actually disable on SystemImmutable; sure it wouldn't have worked, but now there's no worries about it showing up in the UI

svn path=/trunk/KDE/kdelibs/; revision=938383

containment.cpp

@@ -186,24 +186,18 @@ void Containment::init()
         zoomAction->setShortcut(QKeySequence("alt+d,-"));
         d->actions().addAction("zoom out", zoomAction);
 
-        KAction *activityAction = new KAction(i18n("Add Activity"), this);
-        activityAction->setIcon(KIcon("list-add"));
-        activityAction->setVisible(unlocked);
-        activityAction->setEnabled(unlocked);
-        connect(activityAction, SIGNAL(triggered(bool)), this, SLOT(addSiblingContainment()));
-        activityAction->setShortcut(QKeySequence("alt+d,alt+a"));
-        d->actions().addAction("add sibling containment", activityAction);
+        if (corona()) {
+            QAction *action = corona()->action("add sibling containment");
+            if (action) {
+                d->actions().addAction("add sibling containment", action);
+            }
+        }
 
         if (d->type == DesktopContainment && d->toolBox) {
             d->toolBox->addTool(this->action("add widgets"));
-            d->toolBox->addTool(this->action("add sibling containment"));
             d->toolBox->addTool(this->action("zoom in"));
             d->toolBox->addTool(this->action("zoom out"));
 
-            if (immutability() != SystemImmutable) {
-                d->toolBox->addTool(this->action("lock widgets"));
-            }
-
             //TODO: do we need some way to allow this be overridden?
             //      it's always available because shells rely on this
             //      to offer their own custom configuration as well
@@ -1603,12 +1597,6 @@ void ContainmentPrivate::containmentConstraintsEvent(Plasma::Constraints constra
         bool unlocked = q->immutability() == Mutable;
         q->setAcceptDrops(unlocked);
         q->enableAction("add widgets", unlocked);
-        //FIXME immutability changes conflict with zoom changes
-        /*action = actions().action("add sibling containment");
-        if (action) {
-            action->setVisible(unlocked);
-            action->setEnabled(unlocked);
-        }*/
 
         // tell the applets too
         foreach (Applet *a, applets) {

corona.cpp

@@ -566,14 +566,21 @@ void Corona::setImmutability(const ImmutabilityType immutable)
     kDebug() << "setting immutability to" << immutable;
     d->immutability = immutable;
     d->updateContainmentImmutability();
+    //tell non-containments that might care (like plasmaapp or a custom corona)
+    emit immutabilityChanged(immutable);
 
     //update our actions
-    bool unlocked = d->immutability == Mutable;
     QAction *action = d->actions.action("lock widgets");
     if (action) {
+        if (d->immutability == SystemImmutable) {
+            action->setEnabled(false);
+            action->setVisible(false);
+        } else {
+            bool unlocked = d->immutability == Mutable;
             action->setText(unlocked ? i18n("Lock Widgets") : i18n("Unlock Widgets"));
             action->setIcon(KIcon(unlocked ? "object-locked" : "object-unlocked"));
         }
+    }
 
     KConfigGroup cg(config(), "General");
 
@@ -614,6 +621,15 @@ QList<QAction*> Corona::actions() const
     return d->actions.actions();
 }
 
+void Corona::enableAction(const QString &name, bool enable)
+{
+    QAction *action = d->actions.action(name);
+    if (action) {
+        action->setEnabled(enable);
+        action->setVisible(enable);
+    }
+}
+
 } // namespace Plasma
 
 #include "corona.moc"

corona.h

@@ -171,6 +171,14 @@ public:
      */
     QList<QAction*> actions() const;
 
+    /**
+     * convenience function - enables or disables an action by name
+     *
+     * @param name the name of the action in our collection
+     * @param enable true to enable, false to disable
+     */
+    void enableAction(const QString &name, bool enable);
+
 public Q_SLOTS:
     /**
      * Initializes the layout from a config file. This will first clear any existing
@@ -259,6 +267,14 @@ Q_SIGNALS:
      */
     void availableScreenRegionChanged();
 
+    /**
+     * emitted when immutability changes.
+     * this is for use by things that don't get contraints events, like plasmaapp.
+     * it's NOT for containments or applets or any of the other stuff on the scene.
+     * if your code's not in shells/ it probably shouldn't be using it.
+     */
+    void immutabilityChanged(Plasma::ImmutabilityType immutability);
+
 protected:
     /**
      * Loads the default (system wide) layout for this user