Wikimedia Bugzilla is closed!

Currently, all views (jquery.wikibase widgets) are immediately constructed wherever needed. This has several implications:

* They are harder to test because they construct subviews
* Dependencies have to be passed through all parent views
* Knowledge about our views being jQuery-based is scattered throughout our code-base

I propose to introduce a ViewFactory along the following rough spec:

ViewFactory = function( valueViewBuilder, entityStore, dataTypeStore, entityChangersFactory, … )
ViewFactory.prototype = {
  getEntityview: function( node, wb.datamodel.Entity value ){
    return $( node ).entityview( {
      value: value,
      viewFactory: this,
      …
    } );
  },
  getStatementview: function( node, wb.datamodel.Statement value ),
  …
}

That could be constructed in wb.ui.entityViewInit.