IVsObjectList.QueryDragDrop Method
Returns a flag indicating whether the given list item supports a drag-and-drop operation.
Namespace: Microsoft.VisualStudio.Shell.Interop
Assembly: Microsoft.VisualStudio.Shell.Interop (in Microsoft.VisualStudio.Shell.Interop.dll)
Syntax
'Declaration
Function QueryDragDrop ( _
index As UInteger, _
pDataObject As IDataObject, _
grfKeyState As UInteger, _
<OutAttribute> ByRef pdwEffect As UInteger _
) As Integer
int QueryDragDrop(
uint index,
IDataObject pDataObject,
uint grfKeyState,
out uint pdwEffect
)
int QueryDragDrop(
[InAttribute] unsigned int index,
[InAttribute] IDataObject^ pDataObject,
[InAttribute] unsigned int grfKeyState,
[InAttribute] [OutAttribute] unsigned int% pdwEffect
)
abstract QueryDragDrop :
index:uint32 *
pDataObject:IDataObject *
grfKeyState:uint32 *
pdwEffect:uint32 byref -> int
function QueryDragDrop(
index : uint,
pDataObject : IDataObject,
grfKeyState : uint,
pdwEffect : uint
) : int
Parameters
index
Type: 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: UInt32[in] Current state of the keyboard and the mouse modifier keys.
pdwEffect
Type: UInt32%[in, out] On input, the effect being requested. On output, the effect that your object list allows.
Return Value
Type: Int32
If the method succeeds, it returns S_OK. If it fails, it returns an error code.
Remarks
COM Signature
From vsshell.idl:
HRESULT IVsObjectList::QueryDragDrop(
[in] ULONG Index,
[in] IDataObject *pDataObject,
[in] DWORD grfKeyState,
[in, out]DWORD * pdwEffect
);
When the user drags an item and hovers over your item in Class View, the environment calls QueryDragDrop to see if a drag-drop operation is supported.
This method is very similar to the standard COM DragOver 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.
.NET Framework Security
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.