48 lines
1.4 KiB
Python
48 lines
1.4 KiB
Python
"""
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Tabs for courseware.
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"""
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from openedx.core.lib.api.plugins import PluginManager
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_ = lambda text: text
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# Stevedore extension point namespaces
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COURSE_TAB_NAMESPACE = 'openedx.course_tab'
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class CourseTabPluginManager(PluginManager):
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"""
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Manager for all of the course tabs that have been made available.
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All course tabs should implement `CourseTab`.
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"""
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NAMESPACE = COURSE_TAB_NAMESPACE
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@classmethod
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def get_tab_types(cls):
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"""
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Returns the list of available course tabs in their canonical order.
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"""
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def compare_tabs(first_type, second_type):
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"""Compares two course tabs, for use in sorting."""
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first_priority = first_type.priority
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second_priority = second_type.priority
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if first_priority != second_priority:
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if first_priority is None:
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return 1
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elif second_priority is None:
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return -1
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else:
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return first_priority - second_priority
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first_type = first_type.type
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second_type = second_type.type
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if first_type < second_type:
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return -1
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elif first_type == second_type:
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return 0
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else:
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return 1
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tab_types = cls.get_available_plugins().values()
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tab_types.sort(cmp=compare_tabs)
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return tab_types
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