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Drag & drop with virtual records

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Fredrik View Drop Down
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Joined: 22 June 2005
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    Posted: 24 January 2023 at 3:49am
Hi all, 

What's the trick handling drag & drop in a grid control having virtual records? I have added response handler for XTP_NM_GRID_BEGINDRAG but since I have virtual records I get the pointer to the same record regardless which one I drag. I could potentially use GetSelectedRows, but thought I should have the information needed in the XTP_NM_GRIDDRAGDROP structure.

Second question, is it possible to prevent the start of a drag operation when responding to XTP_NM_GRIDDRAGDROP ? I have tried setting different values on *pResult and pItemNotify->bReturnValue.

Third question: I tried to use XTP_NM_GRID_HASVALIDDROPTYPE message to change dropEffect, however, this is ignored in DROPEFFECT CXTPGridControl::OnDragOver? 

XTP_NM_GRIDDRAGDROP nmData;
nmData.dropEffect  = dropEffect;
nmData.pDataObject = pDataObject;
nmData.pt    = point;
// R-DD <<
nmData.dwKeyState = dwKeyState;
// R-DD >>

int iValid = (int)SendNotifyMessage(XTP_NM_GRID_HASVALIDDROPTYPE, (NMHDR*)&nmData);

m_nOLEDropAbove = nmData.bAbove;

if ((dropEffect != DROPEFFECT_NONE) // <- Shouldn't this be nmData.dropEffect?
&& (!pDataObject || (!pDataObject->IsDataAvailable(m_cfGrid) && iValid != 1)))
dropEffect = DROPEFFECT_NONE;


Regards, 
Fredrik
Windows 10, Visual Studio 20157, Toolkit Pro 18.3.0
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