reintroduce busy property in Applet

both the comic and weather applet have to pick out the
_plasma_graphicsObject to access the AppletInterface
object just to set the busy property on it.
this reintroduces the busy proeprty in Applet too,
both setting it to Applet or AppletInterface
will keep them in sync

REVIEW:127411

src/plasma/applet.cpp

@@ -360,6 +360,21 @@ void Applet::setIcon(const QString &icon)
     emit iconChanged(icon);
 }
 
+bool Applet::isBusy() const
+{
+    return d->busy;
+}
+
+void Applet::setBusy(bool busy)
+{
+    if (busy == d->busy) {
+        return;
+    }
+
+    d->busy = busy;
+    emit busyChanged(busy);
+}
+
 KPluginInfo Applet::pluginInfo() const
 {
     return d->appletDescription;

src/plasma/applet.h

@@ -73,6 +73,7 @@ class PLASMA_EXPORT Applet : public QObject
     Q_PROPERTY(Plasma::Types::Location location READ location NOTIFY locationChanged)
     Q_PROPERTY(QString title READ title WRITE setTitle NOTIFY titleChanged FINAL)
     Q_PROPERTY(QString icon READ icon WRITE setIcon NOTIFY iconChanged FINAL)
+    Q_PROPERTY(bool busy READ isBusy WRITE setBusy NOTIFY busyChanged FINAL)
 
 public:
 //CONSTRUCTORS
@@ -323,6 +324,23 @@ public:
      */
     void setIcon(const QString &icon);
 
+    /**
+     * @returns true if the applet should show a busy status, for instance doing
+     * some network operation
+     * @since 5.21
+     */
+    bool isBusy() const;
+
+    /**
+     * Sets the Applet to have a busy status hint, for instance the applet doing
+     * some network operation.
+     * The graphical representation of the busy status depends completely from
+     * the visualization.
+     * @param busy true if the applet is busy
+     * @since 5.21
+     */
+    void setBusy(bool busy);
+
 //ACTIONS
     /**
      * Returns a list of context-related QAction instances.
@@ -431,6 +449,12 @@ Q_SIGNALS:
      */
     void iconChanged(const QString &icon);
 
+    /**
+     * Emitted when the busy status has changed
+     * @since 5.21
+     */
+    void busyChanged(bool busy);
+
 //CONFIGURATION
     /**
      * Emitted when an applet has changed values in its configuration

src/plasma/private/applet_p.cpp

@@ -74,7 +74,8 @@ AppletPrivate::AppletPrivate(KService::Ptr service, const KPluginInfo *info, int
       needsConfig(false),
       started(false),
       globalShortcutEnabled(false),
-      userConfiguring(false)
+      userConfiguring(false),
+      busy(false)
 {
     if (appletId == 0) {
         appletId = ++s_maxAppletId;

src/plasma/private/applet_p.h

@@ -119,6 +119,7 @@ public:
     bool started : 1;
     bool globalShortcutEnabled : 1;
     bool userConfiguring : 1;
+    bool busy : 1;
 };
 
 } // Plasma namespace

src/scriptengines/qml/plasmoid/appletinterface.cpp

@@ -56,7 +56,6 @@ AppletInterface::AppletInterface(DeclarativeAppletScript *script, const QVariant
       m_toolTipItem(0),
       m_args(args),
       m_backgroundHints(Plasma::Types::StandardBackground),
-      m_busy(false),
       m_hideOnDeactivate(true),
       m_oldKeyboardShortcut(0),
       m_dummyNativeInterface(0),
@@ -86,6 +85,9 @@ AppletInterface::AppletInterface(DeclarativeAppletScript *script, const QVariant
     connect(applet(), &Plasma::Applet::iconChanged,
             this, &AppletInterface::iconChanged);
 
+    connect(applet(), &Plasma::Applet::busyChanged,
+            this, &AppletInterface::busyChanged);
+
     connect(applet(), &Plasma::Applet::activated,
             this, &AppletInterface::activated);
 
@@ -125,7 +127,6 @@ AppletInterface::AppletInterface(Plasma::Applet *a, const QVariantList &args, QQ
       m_toolTipTextFormat(0),
       m_args(args),
       m_backgroundHints(Plasma::Types::StandardBackground),
-      m_busy(false),
       m_hideOnDeactivate(true),
       m_oldKeyboardShortcut(0),
       m_dummyNativeInterface(0),
@@ -151,6 +152,15 @@ AppletInterface::AppletInterface(Plasma::Applet *a, const QVariantList &args, QQ
     connect(applet(), &Plasma::Applet::destroyedChanged,
             this, &AppletInterface::destroyedChanged);
 
+    connect(applet(), &Plasma::Applet::titleChanged,
+            this, &AppletInterface::titleChanged);
+
+    connect(applet(), &Plasma::Applet::iconChanged,
+            this, &AppletInterface::iconChanged);
+
+    connect(applet(), &Plasma::Applet::busyChanged,
+            this, &AppletInterface::busyChanged);
+
     connect(appletScript(), &DeclarativeAppletScript::formFactorChanged,
             this, &AppletInterface::formFactorChanged);
     connect(appletScript(), &DeclarativeAppletScript::locationChanged,
@@ -385,17 +395,12 @@ void AppletInterface::setToolTipItem(QQuickItem *toolTipItem)
 
 bool AppletInterface::isBusy() const
 {
-    return m_busy;
+    return applet()->isBusy();
 }
 
 void AppletInterface::setBusy(bool busy)
 {
-    if (m_busy == busy) {
-        return;
-    }
-
-    m_busy = busy;
-    emit busyChanged();
+    applet()->setBusy(busy);
 }
 
 Plasma::Types::BackgroundHints AppletInterface::backgroundHints() const

src/scriptengines/qml/plasmoid/appletinterface.h

@@ -428,7 +428,6 @@ private:
     QPointer<QQuickItem> m_toolTipItem;
     QVariantList m_args;
     Plasma::Types::BackgroundHints m_backgroundHints;
-    bool m_busy : 1;
     bool m_hideOnDeactivate : 1;
     //this is used to build an emacs style shortcut
     int m_oldKeyboardShortcut;