implement a doubleClicked signal.

i must admit that using signals that don't exist to implement needed features in applets is an inventive way to force me to implement stuff in libplasma ;)
BUG:155413

svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=759525

widgets/icon.cpp

@@ -1016,6 +1016,13 @@ void Icon::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
     if (!handled) {
         if (boundingRect().contains(event->pos())) {
             emit clicked();
+
+            if (qApp && d->lastClicked.isValid() && d->lastClicked.elapsed() < qApp->doubleClickInterval()) {
+                emit doubleClicked();
+                d->lastClicked = QTime();
+            } else {
+                d->lastClicked.restart();
+            }
         }
         emit pressed(false);
     }

widgets/icon.h

@@ -209,15 +209,20 @@ protected:
 
 Q_SIGNALS:
     /**
-    * Indicates when the icon has been pressed.
-    */
+     * Indicates when the icon has been pressed.
+     */
     void pressed(bool down);
 
     /**
-    * Indicates when the icon has been clicked.
-    */
+     * Indicates when the icon has been clicked.
+     */
     void clicked();
 
+    /**
+     * Indicates when the icon has been double clicked.
+     */
+    void doubleClicked();
+
 protected:
     bool isDown();
     void mousePressEvent(QGraphicsSceneMouseEvent *event);

widgets/icon_p.h

@@ -23,6 +23,7 @@
 #define ICON_P_H
 
 #include <QtCore/QEvent>
+#include <QtCore/QTime>
 #include <QtGui/QApplication>
 #include <QtGui/QIcon>
 #include <QtGui/QStyleOptionGraphicsItem>
@@ -169,6 +170,7 @@ public:
     QColor shadowColor;
     QSizeF iconSize;
     QIcon icon;
+    QTime lastClicked;
     IconStates states;
     Qt::Orientation orientation;
     int numDisplayLines;