In previous code reviews there was a concern over the performance hit of
RelativeLayout's double measurement, and BackLayerLayout's own double measurement.
As a compromise we chose to use LinearLayout instead. Furthermore after
switching to LinearLayout, the EndBackLayerLayoutTest works, so this commit
also commits that new test.
PiperOrigin-RevId: 161720799
Adds concrete tests for Start, Top and Bottom backlayers.
Note: EndBackLayerLayoutTest has not been added in this CL because it is
failing over layout issues. These issues are not related directly to the core
functionality of the BackLayerLayout, but it still has to be fixed. Punting
this to a separate CL.
PiperOrigin-RevId: 161667143
-The exposure and hide actions are animated, and have before/after callbacks.
-Clicks on the content layer when the backlayer is exposed are hijacked to close the back layer.
-The animations do not relayout, by simply sliding the boundaries (bottom/left/right/top).
PiperOrigin-RevId: 160315361
These are the foundation for the back layer functionality. The behavior
does the heavy lifting to measure the adjacent content view.
As of now this only lays out the views correctly in the hidden state, it doesn't support exposing the back layer at all, yet. Full of TODOs, this is just a skeleton.
PiperOrigin-RevId: 156334640
