Is it possible to attach custom data to an AIS_InteractiveObject?

Tilman Leune
Wed, 02/17/2010 - 09:34

Forums:

I would like to store some custom data (eg. a void* - Pointer) within an AIS_InteractiveObject. Does anyone of you know of a way to do this without instantiating a derived class?

Marco Balen
Wed, 02/17/2010 - 12:37

Hello,

You can use the methods GetOwner,HasOwner,SetOwner of the AIS_InteractiveObject class.
Using this methods you can bind data with an AIS_InteractiveObject. Pay attention to memory leak when you erase the AIS object.

Bye

Tilman Leune
Wed, 02/17/2010 - 18:58

thx

Tilman Leune
Wed, 02/17/2010 - 19:00

Hmm, but it doesn't work. I can only add another standard_transient as owner - maybe i will experiment wiht typecasts.

Marco Balen
Thu, 02/18/2010 - 18:19

Sorry,

You have to use a standard_transient derived class.

I use a class like this :

.hxx

#pragma once

#include
#include
#include
#include

// Your class has to inherit MMgt_TShared or its descendant

DEFINE_STANDARD_HANDLE(CMyData,MMgt_TShared)

class CMyData : public MMgt_TShared
{
// Declare the methods of your class here
//...
public:
CMyData(void);
CMyData(........);
~CMyData(void);

.... add your member here ....

DEFINE_STANDARD_RTTI(CMyData)
};

.cpp

#include "StdAfx.h"
#include "mydata.hxx"

IMPLEMENT_STANDARD_HANDLE(CMyData,MMgt_TShared)

IMPLEMENT_STANDARD_RTTIEXT(CMyData,MMgt_TShared)

// Define the methods of your class here
//...
CMyData::CMyData(void)
{
.... assign your memeber here ...
}

CMyData::CMyData(....)
{
.... assign your memeber here ...
}

CMyData::~CMyData(void)
{
... free your member here
}

I hope this help you

Tilman Leune
Fri, 02/19/2010 - 09:54

Thanks for the clarification. I still need to wrap my head around OCC being totally Object-oriented. I will try to implement this for my case and share my results

Roman Lygin
Fri, 02/19/2010 - 10:55

In addition to using the Owner (which can be already used when using AIS via OCAF and/or during local selection - not sure, please double-check), you can always use a separate map.

typedef NCollection_DataMap ObjectDataMap;

...

ObjectDataMap aMap;

void* aData = ...;

aMap.Bind (anAISObject, aData);

Hope this helps.
Roman

Andrey Pozdeev
Wed, 07/02/2014 - 03:46

Hi Roman,

Thanks for this gem, quite straightforward and insanely useful:

I was able to replicate using Qt as follows:

//Register a typedef with QString
typedef NCollection_DataMap ObjectDataMap;

//store reference to your map in your documentclass
ObjectDataMap myaismap;

1- during ais object creation
//right after creation of AIS_InteractiveObject add it to map
QString keyval = QString("object Id") + QString::number(id);
myaismap.Bind(AIS_OBJ,keyval);

2- during selection:
// get current AIS from selection
myContext->InitCurrent();
Handle_AIS_InteractiveObject Current = myContext->Current() ;

//request QString stored in map
QString id = this->myaismap.Find(Current);

Regards,

Alex