How is the Relationships view so responsive?

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1

How does the Relationships view populate so quickly?

When switching persons in the Relationships view using the example.gramps tree, the view mode updates on my Windoze box in less than a second.

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That refresh time includes changing focus, finding the Families that have the Active Person as a child or spouse, all the people in those families, the marriage events for the Families, the birth & death events for all the people, all the Places for those events, and thumbnails for those people. Then it has to build a appropriate layout around all those objects.

All in less than a second.

It is often useful to run a filter that finds a subset of those: all the objects in one View category for immediate family of the Active Person. And to do that, Gramps requires a (divergent set of rules for each Category) complex mulit-stage custom filter. And it has a painfully slow progress bar for each stage.

What is the difference in the way the Relationship view finds this subset of the Tree? Is there a way to grab the populating method for the Relationship view and layer it into a narrow scope modality for the other views?

2

Looking at the gramps/plugins/view/relview.py starting at Line 618, it doesn’t builds lists from queries. It calls functions to return lists of handles from that class.

So… I suppose the budding developers need a great cheatsheet so they don’t re-invent the wheel.

from gramps/gen/lib/person.py#L883
family_handle_list = person.get_family_handle_list()


    def get_family_handle_list(self):
        """
        Return the list of :class:`~.family.Family` handles in which the person
        is a parent or spouse.
        :returns: Returns the list of handles corresponding to the
                  :class:`~.family.Family` records with which the person
                  is associated.
        :rtype: list
        """
        return self.family_list

from gramps/gen/lib/person.py#L934
family_handle_list = person.get_parent_family_handle_list()

    def get_parent_family_handle_list(self):
        """
        Return the list of :class:`~.family.Family` handles in which the person
        is a child.
        :returns: Returns the list of handles corresponding to the
                  :class:`~.family.Family` records with which the person is a
                  child.
        :rtype: list
        """
        return self.parent_family_list