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@@ -206,22 +206,30 @@ class ViewTab:
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Args:
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label: Human-friendly text
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+ visible: A callable which determines whether the tab should be displayed. This callable must accept exactly one
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+ argument: the object instance. If a callable is not specified, the tab's visibility will be determined by
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+ its badge (if any) and the value of `hide_if_empty`.
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badge: A static value or callable to display alongside the label (optional). If a callable is used, it must
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accept a single argument representing the object being viewed.
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weight: Numeric weight to influence ordering among other tabs (default: 1000)
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permission: The permission required to display the tab (optional).
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- hide_if_empty: If true, the tab will be displayed only if its badge has a meaningful value. (Tabs without a
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- badge are always displayed.)
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+ hide_if_empty: If true, the tab will be displayed only if its badge has a meaningful value. (This parameter is
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+ evaluated only if the tab is permitted to be displayed according to the `visible` parameter.)
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"""
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- def __init__(self, label, badge=None, weight=1000, permission=None, hide_if_empty=False):
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+ def __init__(self, label, visible=None, badge=None, weight=1000, permission=None, hide_if_empty=False):
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self.label = label
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+ self.visible = visible
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self.badge = badge
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self.weight = weight
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self.permission = permission
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self.hide_if_empty = hide_if_empty
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def render(self, instance):
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- """Return the attributes needed to render a tab in HTML."""
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+ """
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+ Return the attributes needed to render a tab in HTML if the tab should be displayed. Otherwise, return None.
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+ """
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+ if self.visible is not None and not self.visible(instance):
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+ return None
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badge_value = self._get_badge_value(instance)
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if self.badge and self.hide_if_empty and not badge_value:
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return None
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Jeremy Stretch