IVsSimpleObjectList2::DoDragDrop Method (UInt32, IDataObject^, UInt32, UInt32)

Visual Studio 2015

Asks the given list item to handle a drag-and-drop operation.

Namespace: Microsoft.VisualStudio.Shell.Interop
Assembly: Microsoft.VisualStudio.Shell.Interop.8.0 (in Microsoft.VisualStudio.Shell.Interop.8.0.dll)

Syntax

C++

int DoDragDrop(
	unsigned int index,
	IDataObject^ pDataObject,
	unsigned int grfKeyState,
	unsigned int% pdwEffect
)

Parameters

index: Type: System::UInt32
[in] Specifies the index of the list item of interest.

pDataObject: Type: Microsoft.VisualStudio.OLE.Interop::IDataObject^
[in] Pointer to an IDataObject being dropped.

grfKeyState: Type: System::UInt32
[in] Current state of the keyboard and the mouse modifier keys.

pdwEffect: Type: System::UInt32
[in, out] On input, the effect being requested. On output, the effect that your object list allows.

Return Value

Type: System::Int32

If the method succeeds, it returns S_OK. If it fails, it returns an error code.

Remarks

COM Signature

From vsshell80.idl:

C++

HRESULT IVsSimpleObjectList2::DoDragDrop(
   [in]      ULONG        Index, 
   [in]      IDataObject *pDataObject, 
   [in]      DWORD        grfKeyState, 
   [in, out] DWORD       *pdwEffect
);

The environment calls QueryDragDrop to see if your object list supports a drag-drop operation. If you return the call indicating that you do support the requested operation, and the user drops pDataObject by releasing the mouse button, the environment calls DoDragDrop. You must then handle the requested action and return the effect in pdwEffect.

This method is very similar to the standard COM Drop method. Values for grfKeyState can be a bitwise "or" combination of any number of the following: MK_CONTROL, MK_SHIFT, MK_ALT, MK_LBUTTON, MK_MBUTTON, and MK_RBUTTON. Values for the pdwEffect are taken from the DROPEFFECT enumeration.