Alastor Wu bc66137e1a Bug 1488673 - part3 : only use BoxPosition format for position calculation r=heycam
It's confused that we have both simpleBoxPosition object and BoxPosition object, we should only use one format to perform all box related operations.

Therefore, BoxPosition should be able to be initiaized by StyleBox, HTMLElement or BoxPosition.

In addition, as `right` and `bottom` can be calculated from other attributes, we remove these two attributes from BoxPosition, and use getter to get the correct value, which can reduce some unnessary modification when we changes the `height` or `width`. In order to implement a more readable getter, so we change `BoxPosition` to class-based.

Differential Revision: https://phabricator.services.mozilla.com/D22809

--HG--
extra : moz-landing-system : lando
2019-03-14 09:29:31 +00:00

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