Add support for multiple dashboards.

Add support for removing dashboard widgets.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/common/classes.py

@@ -45,6 +45,43 @@ class Collection(object):
                 return self._model.objects.all()
 
 
+class Dashboard(object):
+    _registry = {}
+
+    @classmethod
+    def get(cls, name):
+        return cls._registry[name]
+
+    def __init__(self, name, label):
+        self.name = name
+        self.label = label
+        self.widgets = {}
+        self.removed_widgets = []
+        self.__class__._registry[name] = self
+
+    def add_widget(self, widget, order=0):
+        self.widgets[widget] = {'widget': widget, 'order': order}
+
+    def get_widgets(self):
+        """
+        Returns a list of widgets sorted by their 'order'.
+        If two or more widgets have the same 'order', sort by label.
+        """
+        return map(
+            lambda x: x['widget'],
+            filter(
+                lambda x: x['widget'] not in self.removed_widgets,
+                sorted(
+                    self.widgets.values(),
+                    key=lambda x: (x['order'], x['widget'].label)
+                )
+            )
+        )
+
+    def remove_widget(self, widget):
+        self.removed_widgets.append(widget)
+
+
 class DashboardWidget(object):
     _registry = []