PROTOTYPE: sample code for part of proposed xmodule interface

new_xmodule/samples.py

+import xmodule
+from xmodule import progress
+
+
+def SequenceModule(XModule, ResourceTemplateModule):
+
+    def __init__(self, definition, policy, state, preferences):
+        self.state = state
+
+    @property
+    def visited(self):
+        return set(self.state['visited'])
+
+    @property
+    def possible(self):
+        return set(child.id for child in self.children)
+
+    @xmodule.register_view('student')
+    @xmodule.register_view('instructor')
+    def student_view(self):
+        return self.render_template(
+            'main',
+            children=[child.render() for child in self.children]
+        )
+
+    @xmodule.register_handler('update_position')
+    def update_position(self, data):
+        new_position = self.children[data['position']].id
+        self.state['position'] = new_position
+        self.state['visited'] = self.visited.union(new_position)
+        self.update_progress()
+
+    def update_progress(self):
+        progress.publish({
+            'visited': (len(self.visited & self.possible), len(self.possible))
+        })
+
+
+def ChemistryEquationModule(XModule, ResourceTemplateModule):
+
+    def __init__(self, definition, policy, state, preferences):
+        self.state = state
+
+    @xmodule.register_view('student')
+    def student_view(self):
+        return self.render_template(
+            'main',
+            equation=self.state['equation'],
+            rendered_equation=self.render_equation(self.state['equation'])
+        )
+
+    @xmodule.register_handler('render_eq')
+    def render_eq_handler(self, data):
+        self.state['equation'] = data['equation']
+        return self.render_equation(data['equation'])
+
+    def render_equation(self, equation):
+        return PIL.render_render_render(equation)
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