dart - Scoping issues when rendering transcluded content with <content> -


i'm trying make simple component display loading screen until data has arrived , provide simple error handling:

<loading done="ctrl.dataloaded" error="ctrl.dataerror">   <graph       width="ctrl.graphwidth"       data="ctrl.data">   </graph> </loading>

the template <loading> looks this:

<div ng-switch="cmp.error">   <div ng-switch-when="null">     <div ng-switch="cmp.done">       <div ng-switch-when="false">         <h1>loading, please wait...</h1>       </div>       <div ng-switch-default>         <content></content>       </div>     </div>   </div>   <div ng-switch-default>   <h1>an error occurred: {{cmp.error}}</h1>   </div> </div>

however, transcluded <graph> component sees null on attributes instead of expected data controller, failing render.

i assume because it's rendered in scope of <loading>, original ctrl binding not available anymore? there way around this, preserving original attribute bindings?

edit: mentioned in comment below, problem seems come combination of transclusion <content> , having component receives data on attributes. transcluding simple values {{ctrl.graphwidth}} works fine.

edit2: requested, controller 

@ngcontroller(     selector: '[some-graph]',     publishas: 'ctrl') class somegraphcontroller implements ngattachaware {   bool dataloaded = false;   string dataerror = null;   int graphwidth = -1;   list<point> data;    void attach() {     requestdata().then((d) {       data = d;       dataloaded = true;     }).catcherror((e) => dataerror = e.tostring());   } }

and chart component

@ngcomponent(     selector: 'graph',     template: "<svg id='chart'></svg>",     cssurl: '/graph.css',     publishas: 'cmp') class graphcomponent implements ngshadowrootaware {   @ngoneway('width')   int width;    @ngoneway('data')   list<point> data;    void onshadowroot(shadowroot shadowroot) {     print('displaying $data');     drawgraph(shadowroot.queryselector("#chart"));   } }

the print statement prints 'displaying null' when graph component used within loading component, correctly prints data assigned controller when used outside.

i don't think scoping issue.
tried reproduce without ng-switch tags , graph got value controller applied ancestor of <loading>.


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