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Hello,

I am trying to make a custom cell based on CExtGridCellDropListComboBox. For some reason it complains on compiling when I use the IMPLEMENT_DYNCREATE macro?


Any thoughts?

Also how do I intercept the selection changes of the combo box?

Thanks

Thanks!

I guess sometimes when you are looking at your ow code all day you get blurry eyed.

M

I should add:

1) I understand the last error and I removed the propertyItem initialization and I still get the other errors

2) If I remove DECLARE_DYNCREATE and IMPLEMENT_DYNCREATE it compiles and works I just can’t seem to intercept OnPopupListBoxSelEndOK()

Please ensure that you overrode OnPopupListBoxSelEndOK() in this way:

//   *.h file:

 virtual bool OnPopupListBoxSelEndOK(
  CExtPopupInplaceListBox & wndListBox,
  CExtGridCell::TrackCellStateInfo_t & _tcsi
  );


//   *.cpp file:

bool PropertyItemRequestCellCombo::OnPopupListBoxSelEndOK(
 CExtPopupInplaceListBox & wndListBox,
 CExtGridCell::TrackCellStateInfo_t & _tcsi
 )
{
 ASSERT_VALID( this );
 ASSERT( (&_tcsi.m_cell) == this );
 ASSERT_VALID( (&wndListBox) );
 ASSERT_VALID( (&_tcsi.m_wndGrid) );
 
 CExtGridCellDropListComboBox::OnPopupListBoxSelEndOK(
  wndListBox,
  _tcsi
  );
 
 // place your code
 
 return false;
}

Hmm... This didn’t seem to work? I am not sure what is going on here are the exact details:

//------------------
// Header file
//------------------
#pragma once

class PropertyItemRequestCellCombo :
    public CExtGridCellDropListComboBox
{
public:

    DECLARE_DYNCREATE( PropertyItemRequestCellComboCombo );
    IMPLEMENT_ExtGridCell_Clone( PropertyItemRequestCellCombo, CExtGridCellDropListComboBox );

    PropertyItemRequestCellCombo(CExtGridDataProvider * pDP = NULL);
    ~PropertyItemRequestCellCombo(void);

};

//------------------
// CPP file
//------------------

#include "StdAfx.h"
#include ".\PropertyItemRequestCellCombo.h"

IMPLEMENT_DYNCREATE(PropertyItemRequestCellCombo, CExtGridCellDropListComboBox );

PropertyItemRequestCellCombo::PropertyItemRequestCellCombo(CExtGridDataProvider * pDP)
    : CExtGridCellDropListComboBox( pDP ),
    propertyItem(NULL)
{
}

PropertyItemRequestCellCombo::~PropertyItemRequestCellCombo(void)
{
}

//------------------------------------------------
//------------------------------------------------
And when I compile (VS .net) I get the following errors:

PropertyItemRequestCellCombo.cpp(6) : error C2039: ’classPropertyItemRequestCellCombo’ : is not a member of ’PropertyItemRequestCellCombo’
PropertyItemRequestCellCombo.h(5) : see declaration of ’PropertyItemRequestCellCombo’
PropertyItemRequestCellCombo.cpp(6) : error C2496: ’classPropertyItemRequestCellCombo’ : ’selectany’ can only be applied to data items with external linkage
PropertyItemRequestCellCombo.cpp(6) : error C2039: ’classPropertyItemRequestCellCombo’ : is not a member of ’PropertyItemRequestCellCombo’
PropertyItemRequestCellCombo.h(5) : see declaration of ’PropertyItemRequestCellCombo’
PropertyItemRequestCellCombo.cpp(6) : error C2039: ’classPropertyItemRequestCellCombo’ : is not a member of ’PropertyItemRequestCellCombo’
PropertyItemRequestCellCombo.h(5) : see declaration of ’PropertyItemRequestCellCombo’
PropertyItemRequestCellCombo.cpp(11) : error C2614: ’PropertyItemRequestCellCombo’ : illegal member initialization: ’propertyItem’ is not a base or member

It seems the problem is trivial. There is a redundant "combo":

DECLARE_DYNCREATE( PropertyItemRequestCellComboCombo );

In fact, it should be:

DECLARE_DYNCREATE( PropertyItemRequestCellCombo );

We know only one problem with IMPLEMENT_DYNCREATE and grid cells. This problem is caused by a conflict of C++ new operators defined locally in the CExtGridCell class. The solution is really easy. Please open the C++ file that implements your cell class and move the IMPLEMENT_DYNCREATE macro to the top of the file before the definition of the debug version of the new operator:

#include "StdAfx.h"
. . .
IMPLEMENT_SERIAL(...
. . .
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
. . .

As for the selection changed event, you need to override the OnPopupListBoxSelEndOK() virtual method, which is called to handle the final item selection changed event of the list box control in the popup menu tracked by the built-in button.

This is my entire cell class:

#pragma once

class PropertyItem;

class PropertyItemRequestCellCombo :
    public CExtGridCellDropListComboBox
{
public:

    DECLARE_DYNCREATE( PropertyItemRequestCellComboCombo );
    IMPLEMENT_ExtGridCell_Clone( PropertyItemRequestCellCombo, CExtGridCellDropListComboBox );

    PropertyItemRequestCellCombo(CExtGridDataProvider * pDP = NULL);
    ~PropertyItemRequestCellCombo(void);

    void propertyItemSet(PropertyItem *thePropertyItem);

private:
    PropertyItem *propertyItem;
};


//-----------------------------------------------------------------
#include "StdAfx.h"
#include ".\PropertyItemRequestCellCombo.h"
#include "PropertyItem.h"


//IMPLEMENT_DYNCREATE(PropertyItemRequestCellCombo, CExtGridCellDropListComboBox );

PropertyItemRequestCellCombo::PropertyItemRequestCellCombo(CExtGridDataProvider * pDP)
    : CExtGridCellDropListComboBox( pDP ),
    propertyItem(NULL)
{
}

PropertyItemRequestCellCombo::~PropertyItemRequestCellCombo(void)
{
}

void PropertyItemRequestCellCombo::propertyItemSet(PropertyItem *thePropertyItem)
{
    propertyItem = thePropertyItem;
}