Property Grid - HOWTO: XTPPropertyGridItem with drop down tree

HOWTO: XTPPropertyGridItem with drop down tree

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Topic: HOWTO: XTPPropertyGridItem with drop down tree

Posted By: mgampi
Subject: HOWTO: XTPPropertyGridItem with drop down tree
Date Posted: 20 November 2006 at 7:58am

Hi;

In our most recent project I need a property grid item with dropdown tree support.

Has anyone ever done this? Whats the (best) design to realize this.

I prefer to use the CXTPPropertyGridItemConstraints* collection to hold the tree items data, due to minimize the break of the existing grid item design.

Any help is appreciated

Martin

Replies:

Posted By: Oleg
Date Posted: 20 November 2006 at 9:19am

Hi,

The best design is to create new class derived from CXTPPropertyGridItem, override its OnInplaceButtonDown and show your tree.

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Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS

Posted By: mgampi
Date Posted: 20 November 2006 at 9:46am

Hi Oleg;

I have done this already but I'm having troubles in using the control as if it's an item with a simple list where the constraints container determines the tree nodes.

I looked into the internal grid item / constraints design and found out, that its not possible to create my own XTPPropertyGridItemConstraints derived collection, since the m_arrConstraints member is private and no protected or public function exists to insert my own constraint into this list.

All I wanted to do is to provide a somehow standard interface to reusable property tree items like shown in this "pseudo" code sequence:

pItem=grid.AddChildItem(new CMyPropertyGridItemTree(...))

pConstraints=pItem->GetConstraints()

pConstraints.AddConstraint("Item text", new MyItemConstraintData(...));

I need this additional constraint item data to provide such informations as 'parent', 'internal key', ...

My problem is, that I can't find a - only coded once - solution to delete my constraint item data on shutdown.

In my opinion, the right place to do this is in the dtor of the CXTPPropertyGridItemConstraints() class, which I have to override because I use the m_dwData member to store the additional MyItemConstraintData pointer. And now the hidden m_ArrConstraints member comes in once again...

I know, that I could change the source of you library, but thats an maintenance issue, and therefore not allowed in our company.

Martin

Posted By: Oleg
Date Posted: 20 November 2006 at 10:40am

Hi,

why so difficult... why you can't just add this Tree as member and

use pItem->GetTreeCtrl() method to retrieve tree and add nodes.

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Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS

Posted By: mgampi
Date Posted: 20 November 2006 at 1:28pm

Hello Oleg;

you're absolutely right. First I did it the wrong way. I tried to find a somehow 'universal' solution that encapsulates the detail of the tree portion.
On the other hand I wanted to minimize the amount of source code needed to implement tree items with different content.

Martin

Posted By: Oleg
Date Posted: 20 November 2006 at 1:56pm

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Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS