Re: core data app questions - help!
Re: core data app questions - help!
- Subject: Re: core data app questions - help!
- From: Ricardo Strausz <email@hidden>
- Date: Mon, 3 Sep 2007 17:54:00 -0500
Now, this *is* helpful...
I am sure that Jacob will appreciate these words more than any before
in this thread...
On Sep 3, 2007, at 4:50 PM, I. Savant wrote:
On Sep 3, 2007, at 1:13 PM, Ricardo Strausz wrote:
First of all, this is "out-of-context"... as mmalc understood (I
hope) I refer to the hole replay, not only this last line, but any
how...
It really wasn't out of context at all. Unless there are more off-
list messages to this thread that I've not seen, anyway.
http://www.google.com/search?hl=en&client=safari&rls=en&q=delegate
+methods+table+view&btnG=Search
http://www.google.com/search?
hl=en&client=safari&rls=en&q=NSTableView&btnG=Search
IMHO: for me, at least, this is better than nothing...
That's easily debated. Too much indirect, unspecific information
is confusing. My gripe was that you essentially sent a picture of a
guy swinging a hammer and labeled it "How to Build a House". ;-)
A delegate method does exist for being notified of a change in
selection for a table view, but it's still got little to do
directly with the original problem. Sending the OP to a list of
delegate methods (implementing one of which addresses only a small
part of one of his problems) is unhelpful at best.
BTW, Jacob: I'd implement such "sum and average" algorithms in the
delegate method tableViewSelectionDidChange: Then your user will
be able, also, to drag-select some rows and calculate the sum and
average for those selected records.
Okay, I've whined enough and it's time to put my money where my
mouth is.
First, this approach is overkill if you're already using
bindings. As mmalc alluded, you can use Key Value Coding "Set and
Array Operators" to solve this problem via bindings:
http://developer.apple.com/documentation/Cocoa/Conceptual/
KeyValueCoding/Concepts/ArrayOperators.html
This is far easier than responding to a selection change on the
table view and running calculations (and manually updating UI)
there. How 2004! :-)
On to the rest ...
1. I would like to be able to click on a date on the calendar
(currently doesn't have any function) and have only the workout(s)
from that day show in the table.
For the view layer (UI), look up "NSDatePicker". You can
configure it to use a visual calendar view or a text field with
appropriate spinners.
I'm not sure how exactly you'd want to handle this, but with Core
Data, you will need to "ask the right question" when the date is
chosen.
See this document for the use of predicates:
http://developer.apple.com/documentation/Cocoa/Conceptual/
Predicates/index.html
I'm not sure (mmalc?) whether "give me anything on this 'day'"
needs to be translated to "give me anything from 00:00:00 on this
day to 23:59:59 on this same day" or not, but keep that in mind.
These are the things of which you must be aware, anyhow. If you
get stuck, you know where to ask ... ;-)
2. I would like to be able to click on a sport in the sport table on
in the main window (currently just a listing of the sports that I've
added on the sports window) and have only the workout(s) with that
sport associated with them show in the table.
3. I'd like to have the same functionality with the intensity table
in the main window. I'd also like to be able to filter by both sport
and intensity, so if I click on a sport and then click on an
intensity it shows me only the workouts associated with that sport
and intensity.
Again, predicates. You'll probably want to use the selection from
your Sport and Intensity array controllers (the same ones to which
your table views are bound) to build a compound predicate for your
Workout array controller. This will list only "workouts whose sport
is { list of included sports } and whose intensity is { list of
included intensities }".
The devil, as they say, is in the details (and there are probably
more than a few in this setup) but you get the general idea.
4. computations: I'd like to have a text box which shows me the
total of the duration column. If I filter the table by sport or
intensity I'd like this box to show the filtered total. If I can
also show a weekly and monthly total that would be awesome. It would
also be awesome if I could add a column to my workout table that
automatically calculated average pace (workout distance/workout
time).
This was answered above, but to reiterate:
http://developer.apple.com/documentation/Cocoa/Conceptual/
KeyValueCoding/Concepts/ArrayOperators.html
It is automatic and pseudo-magical. It's also the easiest and
most-immediately-complete solution to this wish-list item.
--
I.S.
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden