98 lines
3.1 KiB
Python
98 lines
3.1 KiB
Python
import json
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from lxml import etree
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from x_module import XModule, XModuleDescriptor
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# HACK: This shouldn't be hard-coded to two types
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# OBSOLETE: This obsoletes 'type'
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class_priority = ['video', 'problem']
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class ModuleDescriptor(XModuleDescriptor):
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pass
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class Module(XModule):
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''' Layout module which lays out content in a temporal sequence
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'''
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id_attribute = 'id'
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def get_state(self):
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return json.dumps({ 'position':self.position })
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@classmethod
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def get_xml_tags(c):
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obsolete_tags = ["sequential", 'tab']
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modern_tags = ["videosequence"]
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return obsolete_tags + modern_tags
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def get_html(self):
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self.render()
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return self.content
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def get_init_js(self):
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self.render()
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return self.init_js
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def get_destroy_js(self):
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self.render()
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return self.destroy_js
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def handle_ajax(self, dispatch, get): # TODO: bounds checking
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''' get = request.POST instance '''
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if dispatch=='goto_position':
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self.position = int(get['position'])
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return json.dumps({'success':True})
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raise self.system.exception404
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def render(self):
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if self.rendered:
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return
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## Returns a set of all types of all sub-children
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child_classes = [set([i.tag for i in e.iter()]) for e in self.xmltree]
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titles = ["\n".join([i.get("name").strip() for i in e.iter() if i.get("name") is not None]) \
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for e in self.xmltree]
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self.contents = self.rendered_children()
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for contents, title in zip(self.contents, titles):
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contents['title'] = title
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for (content, element_class) in zip(self.contents, child_classes):
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new_class = 'other'
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for c in class_priority:
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if c in element_class:
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new_class = c
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content['type'] = new_class
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# Split </script> tags -- browsers handle this as end
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# of script, even if it occurs mid-string. Do this after json.dumps()ing
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# so that we can be sure of the quotations being used
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params={'items':json.dumps(self.contents).replace('</script>', '<"+"/script>'),
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'id':self.item_id,
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'position': self.position,
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'titles':titles,
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'tag':self.xmltree.tag}
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if self.xmltree.tag in ['sequential', 'videosequence']:
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self.content = self.system.render_template('seq_module.html', params)
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if self.xmltree.tag == 'tab':
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self.content = self.system.render_template('tab_module.html', params)
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self.rendered = True
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def __init__(self, system, xml, item_id, state=None):
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XModule.__init__(self, system, xml, item_id, state)
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self.xmltree = etree.fromstring(xml)
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self.position = 1
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if state is not None:
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state = json.loads(state)
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if 'position' in state: self.position = int(state['position'])
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# if position is specified in system, then use that instead
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if system.get('position'):
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self.position = int(system.get('position'))
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self.rendered = False
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