Merge 0b95acc1 from master to r12. do not merge.

RelativeLayout: Assign ids dynamically, handle multi-drag, bugs

This CL fixes three issues with the new relative layout interaction:

(1) Assign ids dynamically. Before this changeset you couldn't attach
    to a node which does not have an @id attribute, since layout
    params need to name the constraint by id.

    This changeset changes this such that you can attach to any
    arbitrary edge, and when you commit the drag, a unique id is
    generated on the fly and assigned to the node.

(2) Handle dragging multiple nodes at the same time. The new
    constraints code was unconditionally applying the same constraints
    to all the dragged nodes, which meant they ended up on top of each
    other. This fixes things such that the first node is assigned the
    new constraints, and then all subsequent nodes are attached one
    next to the other, in a direction depending on which edge you
    attached to (e.g. attaching on the right will arrange the siblings
    towards the left out from the edge.)

(3) Fix a bug in the code to detect and prevent cycles.

Change-Id: I3da16903ffac6c34a0d5efee52a87824fb9e04fb

0 files changed, 0 insertions, 0 deletions