Support for included and merged views
We have support in the layout library for handling included views
where the include tag is associated with the root elements rendered in
that included view.
However, there are various scenarios where this is not adequate:
1) including <merge> views (see issue 13288)
2) older layout libraries
This changeset fixes the above scenarios, as well as an additional
scenario (where rendering included content in an outer layout did not
work properly if the included elements were not at the root level).
It does this by moving the CanvasViewInfo construction into a set of
factory methods which handle various different hierarchy types of
ViewInfos. ViewInfos with null keys at the top are handled one way;
ViewInfo subtrees that introduce null keys further down are handled
another, and it attempts to match up elements in the UiViewElementNode
hierarchy with ViewInfo objects. If it cannot match them one to one,
it will create a single "bounding box" view containing all unmatched
ViewInfos. This will for example produce a single box out of included
<merge> views.
This changeset also handles multiple includes. The "overlay mask"
could earlier only handle a single include whereas the rewritten code
can handle multiple "holes" in the mask by computing the set of
subrectangles remaining after punching out the include holes.
Change-Id: I163413c7fc301f25c4523b0ee03690f983a05322
11 files changed