Add box property management

Widgets can be put in left, center or right box.
Warning: right box is available (no error), but seems undefined (Gnome Shell 3.36)...

examples/dbusitem.py

@@ -1,22 +1,25 @@
 
 class DBUSItem:
-    def __init__(self, name, text='', style='', icon='', iconStyle='', onClick=''):
+    def __init__(self, name, text='', style='', icon='', iconStyle='', onClick='', box=''):
         self.name = name
         self.text = text
         self.style= style
         self.icon = icon
         self.iconStyle = iconStyle
         self.onClick = onClick
-
+        self.box = box
+        
         self._checkValues()
 
     def _checkValues(self):
         if self.onClick and not self.onClick in ('signal', 'delete'):
             raise ValueError('Invalid onClick value')
+        if self.box and not self.box in ('left', 'center', 'right'):
+            raise ValueError('Invalid box value')
         
     def toMap(self):
         myMap = {"name":self.name}
-        for p in ('text', 'style', 'icon'):
+        for p in ('text', 'style', 'icon', 'box'):
             if self.__dict__[p]:
                 myMap[p] = self.__dict__[p]
         if self.iconStyle:

examples/timer.py

@@ -45,7 +45,7 @@ class TimerThread(Thread):
     def _displayTimerValue(self):
         encoder = json.JSONEncoder()
         res = {'group':'Timer', 'items':[]}
-        item = DBUSItem('timer', onClick='signal')
+        item = DBUSItem('timer', onClick='signal', box='right')
         curValue = self.timers[self.curTimer]
         item.text = '%02d:%02d' % (int(curValue/60)%60, curValue%60)
         if curValue >= (60*60):