add functions setBusy(bool) and isBusy()

used to easily display a busy indicator as an overlay of the applet when
is loading stuff

svn path=/trunk/KDE/kdelibs/; revision=880089

applet.cpp

@@ -75,6 +75,7 @@
 #include "widgets/iconwidget.h"
 #include "widgets/label.h"
 #include "widgets/pushbutton.h"
+#include "widgets/busywidget.h"
 #include "tooltipmanager.h"
 #include "wallpaper.h"
 
@@ -539,6 +540,29 @@ Extender *Applet::extender() const
     return d->extender;
 }
 
+void Applet::setBusy(bool busy)
+{
+    if (busy) {
+        if (!d->busyWidget) {
+            d->busyWidget = new Plasma::BusyWidget(this);
+        } else {
+            d->busyWidget->show();
+        }
+        int busySize = qMin(size().width(), size().height())/3;
+        QRect busyRect(0, 0, busySize, busySize);
+        busyRect.moveCenter(boundingRect().center().toPoint());
+        d->busyWidget->setGeometry(busyRect);
+    } else {
+        d->busyWidget->hide();
+        d->busyWidget->deleteLater();
+    }
+}
+
+bool Applet::isBusy() const
+{
+    return d->busyWidget && d->busyWidget->isVisible();
+}
+
 QString Applet::name() const
 {
     if (isContainment()) {
@@ -834,6 +858,13 @@ void Applet::flushPendingConstraintsEvents()
         }
     }
 
+    if (c & Plasma::SizeConstraint && d->busyWidget && d->busyWidget->isVisible()) {
+        int busySize = qMin(size().width(), size().height())/3;
+        QRect busyRect(0, 0, busySize, busySize);
+        busyRect.moveCenter(boundingRect().center().toPoint());
+        d->busyWidget->setGeometry(busyRect);
+    }
+
     if (c & Plasma::FormFactorConstraint) {
         FormFactor f = formFactor();
         if (!isContainment() && f != Vertical && f != Horizontal) {
@@ -1666,6 +1697,7 @@ AppletPrivate::AppletPrivate(KService::Ptr service, int uniqueID, Applet *applet
           backgroundHints(Applet::StandardBackground),
           appletDescription(service),
           needsConfigOverlay(0),
+          busyWidget(0),
           background(0),
           script(0),
           package(0),

applet.h

@@ -542,6 +542,17 @@ class PLASMA_EXPORT Applet : public QGraphicsWidget
                         const QString &serviceId = QString(),
                         uint appletId = 0);
 
+        /**
+         * Shows a busy indicator that overlays the applet
+         * @param busy show or hide the busy indicator
+         */
+        void setBusy(bool busy);
+
+        /**
+         * @return true if the applet is busy and is showing an indicator widget for that
+         */
+        bool isBusy() const;
+
     Q_SIGNALS:
         /**
          * This signal indicates that an application launch, window

private/applet_p.h

@@ -30,6 +30,7 @@ namespace Plasma
 class FrameSvg;
 class AppletScript;
 class Wallpaper;
+class BusyWidget;
 
 class AppletOverlayWidget : public QGraphicsWidget
 {
@@ -85,6 +86,7 @@ public:
     Applet::BackgroundHints backgroundHints;
     KPluginInfo appletDescription;
     AppletOverlayWidget *needsConfigOverlay;
+    Plasma::BusyWidget *busyWidget;
     QList<QGraphicsItem*> registeredAsDragHandle;
     QStringList loadedEngines;
     Plasma::FrameSvg *background;