allow applets to query for their context, update the context via a constraint (we're running out of them!)

svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=848820

applet.cpp

@@ -1006,6 +1006,12 @@ Location Applet::location() const
     return c ? c->d->location : Plasma::Desktop;
 }
 
+QString Applet::context() const
+{
+    Containment *c = containment();
+    return c->Containment::context();
+}
+
 Plasma::AspectRatioMode Applet::aspectRatioMode() const
 {
     return d->aspectRatioMode;
@@ -1058,6 +1064,7 @@ void Applet::setHasConfigurationInterface(bool hasInterface)
     if (d->hasConfigurationInterface == hasInterface) {
         return;
     }
+
     d->hasConfigurationInterface = hasInterface;
     //config action
     //TODO respect security when it's implemented (4.2)

applet.h

@@ -240,6 +240,11 @@ class PLASMA_EXPORT Applet : public QGraphicsWidget
          */
         virtual Location location() const;
 
+        /**
+         * Returns the workspace context which the applet is operating in
+         */
+        QString context() const;
+
         /**
          * @return the preferred aspect ratio mode for placement and resizing
          */

containment.cpp

@@ -45,6 +45,7 @@
 #include <KWindowSystem>
 
 #include "animator.h"
+#include "context.h"
 #include "corona.h"
 #include "svg.h"
 #include "wallpaper.h"
@@ -1054,6 +1055,27 @@ Plasma::Wallpaper* Containment::wallpaper() const
     return d->wallpaper;
 }
 
+void Containment::setContext(const QString &context)
+{
+    if (d->context != context) {
+        d->context = context;
+        Context c;
+        QStringList contexts = c.contexts();
+        if (!contexts.contains(context)) {
+            c.createContext(context);
+        }
+
+        foreach (Applet *a, d->applets) {
+            a->updateConstraints(ContextConstraint);
+        }
+    }
+}
+
+QString Containment::context() const
+{
+    return d->context;
+}
+
 KActionCollection& ContainmentPrivate::actions()
 {
     return static_cast<Applet*>(q)->d->actions;

containment.h

@@ -290,11 +290,23 @@ class PLASMA_EXPORT Containment : public Applet
          */
         void setWallpaper(const QString &pluginName, const QString &mode = QString());
 
-       /**
+        /**
          * Return wallpaper plugin.
          */
         Plasma::Wallpaper* wallpaper() const;
 
+        /**
+         * Sets the current context
+         *
+         * @param context the name of the context; if it doesn't exist in the
+         *        semantic store, it will be created.
+         */
+        void setContext(const QString &context);
+
+        /**
+         * @return the current context associated with this activity
+         */
+        QString context() const;
 
     Q_SIGNALS:
         /**

plasma.h

@@ -45,7 +45,9 @@ enum Constraint { NoConstraint = 0,
                   SizeConstraint = 8 /** the size of the applet was changed */,
                   ImmutableConstraint = 16 /** the immutability (locked) nature of the applet changed  */,
                   StartupCompletedConstraint = 32 /** application startup has completed */,
-                  AllConstraints = FormFactorConstraint | LocationConstraint | ScreenConstraint | SizeConstraint | ImmutableConstraint
+                  ContextConstraint = 64 /** the desktop context has changed */,
+                  AllConstraints = FormFactorConstraint | LocationConstraint | ScreenConstraint |
+                                   SizeConstraint | ImmutableConstraint | ContextConstraint
 };
 Q_DECLARE_FLAGS(Constraints, Constraint)
 

private/containment_p.h

@@ -102,6 +102,7 @@ public:
     int screen;
     ToolBox *toolBox;
     Containment::Type type;
+    QString context;
     bool positioning;
     bool drawWallpaper;
 };