U++ framework: TreeCtrl » PROPOSAL: TreeCtrl optionally owns Ctrl's in Node

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PROPOSAL: TreeCtrl optionally owns Ctrl's in Node [message #30202]

Wed, 15 December 2010 15:52

kohait00
Messages: 939
Registered: July 2009
Location: Germany

Experienced Contributor

hi all

ArrayCtrl has got the possibility to own the Ctrls if they are passed as pointer, so one can create some on the fly and have the TreeCtrl take care of their destruction. this is great for editing the represented values.
it does not break the 'everything-belongs-somewhere-rule'. TreeCtrl is then the container..

since these two, ArrayCtrl and TreeCtrl are the major complex grouping Ctrl's they should support it and be of similar skills.

what do you think?

EDIT: at first i thought it is easy task, since TreeCtrl is already setup as to have Ctrls, but not owned. but i realize that TreeCtrl::Node and TreeCtrl::Item handling is not fitting in design as to handle ownership.

maybe someone could help here. attached is the so far changed TreeCtrl sources

Attachment: TreeCtrl.h
(Size: 16.16KB, Downloaded 565 times)
Attachment: TreeCtrl.cpp
(Size: 36.67KB, Downloaded 520 times)

[Updated on: Wed, 15 December 2010 21:31]

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Re: PROPOSAL: TreeCtrl optionally owns Ctrl's in Node [message #30601 is a reply to message #30202]

Tue, 11 January 2011 15:03

kohait00
Messages: 939
Registered: July 2009
Location: Germany

Experienced Contributor

any advances on that one?

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Re: PROPOSAL: TreeCtrl optionally owns Ctrl's in Node [message #30670 is a reply to message #30601]

Sun, 16 January 2011 11:26

mirek
Messages: 14290
Registered: November 2005

Ultimate Member

Well, I guess there is no real demand to introduce this now...

Frankly, in this department, much more pressing issue is optimization of how ArrayCtrl is handling widgets (it gets quite slow if there is enough lines).

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Re: PROPOSAL: TreeCtrl optionally owns Ctrl's in Node [message #30720 is a reply to message #30670]

Tue, 18 January 2011 10:38

kohait00
Messages: 939
Registered: July 2009
Location: Germany

Experienced Contributor

not quite sure about the demand. see the downloads of the file... Smile

i think it's be great to have them both..not to have to take care of the controls you set up in the TreeCtrl is just a nice thing, keeping user code cleaner (no need to take care of add's and removes)

ps: thanks for the improvements on arrayctrl

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Re: PROPOSAL: TreeCtrl optionally owns Ctrl's in Node [message #30749 is a reply to message #30720]

Thu, 20 January 2011 14:32

mirek
Messages: 14290
Registered: November 2005

Ultimate Member

Could send me some file so that I can test it?

(Sorry for asking, too lazy to clober together one and I believe you must have had something like for debugging it Smile

Mirek

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Re: PROPOSAL: TreeCtrl optionally owns Ctrl's in Node [message #30754 is a reply to message #30749]

Thu, 20 January 2011 15:40

kohait00
Messages: 939
Registered: July 2009
Location: Germany

Experienced Contributor

thanks for taking on it..
here again a complete packet, based on current revision

i think the major problem is the DND stuff, which uses copies of Node instances. while ArrayCtrl moves them i think.

Attachment: TreeCtrl.rar
(Size: 13.97KB, Downloaded 485 times)

[Updated on: Thu, 20 January 2011 15:48]

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Re: PROPOSAL: TreeCtrl optionally owns Ctrl's in Node [message #32530 is a reply to message #30754]

Mon, 23 May 2011 22:57

kohait00
Messages: 939
Registered: July 2009
Location: Germany

Experienced Contributor

i will be warming up this thing, but need an advice in which direction to go:

the key problem in TreeCtrl is that Node is meant to be passed around by-value, i.e. performing DnD movings or using the Copy() function..

when a Node references a Ctrl which it owns, it cant be passed around by-value, it either needs to be picked (dtor would take care of destruciton of Ctrl) or a different Method for Moving/DnD of the Nodes needs to be found to avoid copy which would duplicate the Node and double ownership. so Node might need to stay unmouvable (exposed only as const or have a subclass which actually holds the ctrl..

any idea? i dont know what'd be better.

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Re: PROPOSAL: TreeCtrl optionally owns Ctrl's in Node [message #32683 is a reply to message #32530]

Wed, 01 June 2011 20:49

mirek
Messages: 14290
Registered: November 2005

Ultimate Member

kohait00 wrote on Mon, 23 May 2011 16:57

Well, general advice in this case is to "give up" Smile

I mean, do not support "predefined" DnD ops for Ctrl owning TreeCtrl. If programmer wants this, he needs to provide his specialized methods.

Mirek

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