Home » U++ Library support » ArrayCtrl, HeaderCtrl & GridCtrl » Howto: Row Aggregation for ArrayCtrl
| Howto: Row Aggregation for ArrayCtrl [message #12856] |
Thu, 22 November 2007 07:58  |
kfeng
Messages: 18
Registered: July 2007
Location: Tokyo, Japan
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Promising Member |
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Hi,
What is the best approach to provide Row Aggregation functionality in ArrayCtrl?
Suppose I have five rows (ignore ... - didn't know how to embed a space):
A B C
> 1 2 3
...1 5 6
> 2 3 5
...2 3 7
...2 3 2
I want to be able to click on some TreeCtrl-like arrow > and collapse the results into some aggregation after two clicks.
A B C
^ 1 7 9
^ 2 3 14
Rows A=1 has summed columns B and C (Aggregate by A)
Rows A=2, B=3 has summed column C (Aggregate by A,B)
This kind of functionality probably adds a lot of complexity to a class so if someone can suggest an approach (which methods should I focus on?) to how I would best implement this in an extended class, I would greatly appreciate it - or if someone has an example, that would even be better!
Thank you.
Regards,
Ken
[Updated on: Thu, 22 November 2007 08:05] Report message to a moderator |
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| Re: Howto: Row Aggregation for ArrayCtrl [message #12876 is a reply to message #12856] |
Fri, 23 November 2007 23:16  |
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mirek
Messages: 14255
Registered: November 2005
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Ultimate Member |
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| kfeng wrote on Thu, 22 November 2007 01:58 |
Hi,
What is the best approach to provide Row Aggregation functionality in ArrayCtrl?
Suppose I have five rows (ignore ... - didn't know how to embed a space):
A B C
> 1 2 3
...1 5 6
> 2 3 5
...2 3 7
...2 3 2
I want to be able to click on some TreeCtrl-like arrow > and collapse the results into some aggregation after two clicks.
A B C
^ 1 7 9
^ 2 3 14
Rows A=1 has summed columns B and C (Aggregate by A)
Rows A=2, B=3 has summed column C (Aggregate by A,B)
This kind of functionality probably adds a lot of complexity to a class so if someone can suggest an approach (which methods should I focus on?) to how I would best implement this in an extended class, I would greatly appreciate it - or if someone has an example, that would even be better!
Thank you.
Regards,
Ken
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IMO, the possible approach is to introduce a column with widgets that act as that arrow and alter the content on each click.
Of course, if the array is large, can be slow...
(Other than that, I am afraid that such requirement exceeds ArrayCtrl flexibility...)
Mirek
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