I'll do my best to describe this, but will probably omit something
important:
Imagine that I have a table view that contains animals. Each animal
has a species 'e.g Dog' and a classification 'e.g Mammal'. New
animals get added to this table intermittently from an external
source. This table is working perfectly, but is needed to explain the
next table better.
I have another table which is used to filter the animals displayed in
the first table by their classification. E.g The table might consist of:
Mammal
Bird
Fish
The array controller for this table is observing changes to the
animals array controller.
When the user clicks on one of the items in this array the animals
table nicely updates to show only those animals with the selected
classification (by filtering in arrangeObjects).
So imagine we have Bird selected in this list. A new animal comes in
from our external source and all the bindings code works nicely to
update the animals table controller which causes the classification
controller to rebuild its array. As things currently stand, Birds is
still selected in the this list and is what I want to happen.
Now onto the problem:
I recently changed the classification controller so that the
NSStrings that it keeps in its array also have a bracketed count in
them so we can see how many there are of each type:
Mammal (27)
Bird (5)
Fish (12)
If I have the 'Bird (5)' row selected and another bird comes in, then
the end result is that although my classification table shows there
now being 6 birds, the 'Mammal (27)' row gets selected and the
animals table is now showing only mammals, not birds. I am guessing
that this happens because the array controller is not able to match
up my 'Bird (5)' row with anything, and so it just selects the first
row in the table.
So what I need to know is if it is possible to intervene in how
NSArrayController tries to match up the selection. Does it all just
come down to an isEqualTo test?
Hope that all makes sense
Matt Gough
Softchaos Limited
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