A number between 0 and 1. By default, 0.5. Specifies how the offset relative to the drag source node is translated into the the horizontal offset of the drag preview when their sizes don't match. 0 means "dock the preview to the left", 0.5 means "interpolate linearly" and 1 means "dock the preview to the right".

A number between 0 and 1. By default, 0.5. Specifies how the offset relative to the drag source node is translated into the the vertical offset of the drag preview when their sizes don't match. 0 means "dock the preview to the top, 0.5 means "interpolate linearly" and 1 means "dock the preview to the bottom."

By default, false. If true, the component will learn that it is being dragged immediately as the drag starts instead of the next tick. This means that the screenshotting would occur with monitor.isDragging() already being true, and if you apply any styling like a decreased opacity to the dragged element, this styling will also be reflected on the screenshot. This is rarely desirable, so false is a sensible default. However, you might want to set it to true in rare cases, such as if you want to make the custom drag layers work in IE and you need to hide the original element without resorting to an empty drag preview which IE doesn't support.

By default, null. Specifies the vertical offset between the cursor and the drag preview element. If offsetX has a value, anchorX won't be used.

By default, null. Specifies the vertical offset between the cursor and the drag preview element. If offsetY has a value, anchorY won't be used.