* use flex
* show clear btn
* support one way
* add dropdown
* add pagination
* support pagination
* use flex
* operation stretch
* pagination works
* update selection logic
* no need to show checkbox on pagination
* fix tree demo
* support invert selection
* remove current pages
* update style
* update snapshot
* clean up
* update test case
* update test case
* update snapshot
* fix lint
* add deps
* update doc
* update hover style
* update hover checked style
* adjust demo & active region
* fix lint
* update snapshot
