I am designing a Web Sortable (via D&D) Interface.
When you drag an element I would like to have the placeholder indicate where the element will be dropped. The problem is, if I want to move a large element down, the placeholder takes up too much space.
Of course it could be programmed so that when the element you are dragging reaches the bottom of the window, the window starts to scroll slowly.
However I am wondering if this could be a usability problem?
The Alternative is to have placeholders which are just a line instead of as big as the element being dragged.
This creates a little bit of a jump on drag start and I dont really like it, but I am not sure if it isnt actually better for the users.
This is how it may look like:
Which is the right approach, considering I have draggable/sortable elements with unknown heights and widths?