Provide finer control on state view reuse when changing url

[sarod]

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This is a:

• [ ] Bug Report
• [X] Feature Request
• [ ] General Query

My version of UI-Router is: 1.0.3

Feature Request

ui-router 1.0 dynamic parameters allow some control over when the state and views are recreated. However in some cases one may need more control. ui-router 0.2 provided more flexibility thanks the notify:false option. However notify: false needed to be defined for each call to $state.go and were not usable in links ui-sref.

A more flexible approach would be to support registering an optional "reloadFn" function on the StateDeclaration. The routing would then call this method with the parameters of the previous state and the parameters of the new state. If the function returns true the view will be reused similarly to what is done currently when changing only dynamic params. If the function returns false the view will be recreated.

export interface StateDeclaration {    
    reloadFn?: ReloadStateFn;
}

export interface ReloadStateFn {
    (previousParams: {[key: string]: Param;}, newParams; {[key: string]: Param;}): boolean;
}

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