[core] Make error widget scrollable

Restrict error module to 15 characters and make it scrollable.

core/module.py

@@ -3,6 +3,7 @@ import logging
 
 import core.input
 import core.widget
+import core.decorators
 
 log = logging.getLogger(__name__)
 
@@ -47,7 +48,10 @@ class Error(Module):
         self._module = module
         self._error = error
 
-    def full_text(self):
+        self.widgets()[0].set('theme.width', 15)
+
+    @core.decorators.scrollable
+    def full_text(self, widget):
         return '{}: {}'.format(self._module, self._error)
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4

core/widget.py

@@ -11,7 +11,7 @@ class Widget(util.store.Store, core.input.Object):
             self._full_text = value
         else:
             if callable(self._full_text):
-                return self._full_text()
+                return self._full_text(self)
         return self._full_text
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4

modules/__pulseaudio.py

@@ -113,7 +113,7 @@ class Module(core.module.Module):
         logging.error('no pulseaudio device found')
         return 'n/a'
 
-    def volume(self):
+    def volume(self, widget):
         if self._failed == True:
             return 'n/a'
         if int(self._mono) > 0:

modules/datetime.py

@@ -33,7 +33,7 @@ class Module(core.module.Module):
     def default_format(self):
         return '%x %X'
 
-    def full_text(self):
+    def full_text(self, widget):
         enc = locale.getpreferredencoding()
         retval = datetime.datetime.now().strftime(self._fmt)
         if hasattr(retval, 'decode'):