IRenderHandlerStartDragging Method

Called when the user starts dragging content in the web view. Contextual information about the dragged content is supplied by dragData. (|x|, |y|) is the drag start location in screen coordinates. OS APIs that run a system message loop may be used within the StartDragging call. Return false to abort the drag operation. Don't call any of CefBrowserHost::DragSource*Ended* methods after returning false. Return true to handle the drag operation. Call IBrowserHost::DragSourceEndedAt and DragSourceSystemDragEnded either synchronously or asynchronously to inform the web view that the drag operation has ended.

bool StartDragging(
	IDragData dragData,
	DragOperationsMask mask,
	int x,
	int y
)

bool StartDragging(
	IDragData^ dragData, 
	DragOperationsMask mask, 
	int x, 
	int y
)