angular 4 programmatic animation -


how add animation programatically ?

@component({     moduleid: module.id,     selector: 'my-toolbar',     templateurl: './my-toolbar.component.html',     styleurls: ['./my-toolbar.component.scss'],     encapsulation: viewencapsulation.none,     animations: [         trigger('mytoolbarstate', [             state('initial', style({top: '*'})),             state('up', style({top: '-50px')),             transition('initial => up, => initial',                 animate(header_shrink_transition))         ])     ] })

how achieve same without annotation ? underlying goal create dynamic trigger function uses different values based on @input.

it important note animations or triggers must have at-least 1 variable. makes question different how reuse animations.

i ended following factory class shown below being used animations[]:-

this used below:

@component({   selector: 'my-app-header',   moduleid: module.id,   templateurl: './app-header.component.html',   styleurls: ['./app-header.component.scss'],   animations: [       mytoolbaranimator.createtrigger('appheaderstate', '50px', '0')   ] })

defined mytoolbaranimator static method createtrigger returns animationtriggermetadata shown below

mytoolbaranimator

import {trigger, state, style, animate, transition, animationtriggermetadata} '@angular/animations';  export const header_shrink_transition = '250ms cubic-bezier(0.4,0.0,0.2,1)';  export class mytoolbaranimator {     static createtrigger(triggername: string, initialtop: string, uptop: string): animationtriggermetadata {         return trigger(triggername, [             state('initial', style({top: initialtop})),             state('up', style({top: uptop})),             transition('initial => up, => initial',                 animate(header_shrink_transition))         ]);     } }

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