-> Refactored the preview background rendering to be much more self-contained.
This cleans up a lot of code in the CellLayout, and keeps the logic in the
right place.
-> We switch to software rendering for performance and compatibility reasons.
-> Removed all assets.
-> FolderIcon accept animation includes animation of the clipped region.
-> 1:1 hand-off of drawing of the FolderIcon background between the FolderIcon
and the CellLayout. Unfortunately, CellLayout rendering is still required
to work around clipping issues (due to use of software layer). We also
need this to support folder creation feedback.
Change-Id: Ib8f7fa6359dfedff8145f38dd50ba03849ca0d51
-> Tracking individual drawing parms for each item
-> This enables animation of the preview items as the preview changes
Change-Id: I1b8f650cb28dc09cfb921bbdc93f2a3db61178fd
-> Modeled as a set of items around a circle
-> Modulate the radius and icon size as number of items grow
-> Clip the icons by a circular clip aligned to the background drawable
Remaining issues
-> Probably want to move to a programmaticly drawn circle + shadow
-> Anti-aliasing of the clipped region will need more attention
-> Need to animate all items in the preview as it changes (this
wasn't required before)
Change-Id: I678ec605f6c8a34e9d7e4aec4e9583e36a9ef394
