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Features/Activity specific metadata in Journal (view source)
Revision as of 18:39, 11 November 2011
, 18:39, 11 November 2011→Detailed Description
== Detailed Description ==
== Detailed Description ==
The Journal has a fixed set of metadata entries that are displayed in the Journal detail view for all entries, e.g., 'description', 'tags', 'preview', et al. It is proposed that we also include activity-specific metadata. For example, when assessing student work, it is of interest to teachers to know what tools a student may have used and, perhaps how many iterations a student made in creating an artifact. These data may vary from activity to activity, hence it is proposed to enhance the Journal Expanded View in a way that enables activities to specify which metadata fields would be useful to display.
The proposed mechanism is two-fold: (1) a special metadata field, 'public' is used to list those metadata fields that should be displayed; and (2) a new text field is added to the Expanded View to display these data. In the illustration above, two fields are displayed: Iterations and Block Types. These fields were set by the Turtle Art program. Other activities may set other fields (or no fields, in which case, the new text field would not be shown.)
<pre>
# In the Turtle Art activity write_file method, the public metadata entry is set
self.metadata['public'] = data_to_string([_('activity count'),
_('turtle blocks')])
# In expandedentry.py, the public fields are displayed
activity_box, self._public_data = self._create_public_data()
second_column.append(activity_box)
...
if 'public' in self._metadata:
public_data = self._public_data.text_view_widget
activity_list = simplejson.loads(self._metadata['public'])
text = ''
for tag in activity_list:
logging.debug(tag)
text += '%s: %s\n' % (tag, str(metadata.get(tag, '')))
public_data.props.buffer.props.text = text
def _create_public_data(self):
vbox = hippo.CanvasBox()
vbox.props.spacing = style.DEFAULT_SPACING
text = hippo.CanvasText(text=_('Activity Data:'),
font_desc=style.FONT_NORMAL.get_pango_desc())
text.props.color = style.COLOR_BUTTON_GREY.get_int()
if gtk.widget_get_default_direction() == gtk.TEXT_DIR_RTL:
text.props.xalign = hippo.ALIGNMENT_END
else:
text.props.xalign = hippo.ALIGNMENT_START
vbox.append(text)
text_view = CanvasTextView('',
box_height=style.GRID_CELL_SIZE)
vbox.append(text_view, hippo.PACK_EXPAND)
text_view.text_view_widget.props.accepts_tab = False
text_view.text_view_widget.connect('focus-out-event',
self._tags_focus_out_event_cb)
return vbox, text_view
</pre>
== Benefit to Sugar ==
== Benefit to Sugar ==