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Viewing changes to ivle/webapp/base/xhtml.py

Allow XHTML views to specify that they cannot have overlays.

We utilise this in +{tos,logout,login}.

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Lines of Context:
ivle/webapp/base/xhtml.py
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    template = 'template.html'
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    plugin_scripts = {}
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    plugin_styles = {}
 
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    allow_overlays = True
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    overlay_blacklist = []
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    def __init__(self, req, **kwargs):
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        scripts_init.
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        """
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        overlays = []
 
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        if not self.allow_overlays:
 
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            return overlays
 
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        for plugin in req.plugin_index[OverlayPlugin]:
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            for overclass in plugin.overlays:
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                if overclass in self.overlay_blacklist: