fuse-angular/src/@fuse/animations/expand-collapse.ts

import {
    animate,
    state,
    style,
    transition,
    trigger,
} from '@angular/animations';
import {
    FuseAnimationCurves,
    FuseAnimationDurations,
} from '@fuse/animations/defaults';

// -----------------------------------------------------------------------------------------------------
// @ Expand / collapse
// -----------------------------------------------------------------------------------------------------
const expandCollapse = trigger('expandCollapse', [
    state(
        'void, collapsed',
        style({
            height: '0',
        })
    ),

    state('*, expanded', style('*')),

    // Prevent the transition if the state is false
    transition('void <=> false, collapsed <=> false, expanded <=> false', []),

    // Transition
    transition('void <=> *, collapsed <=> expanded', animate('{{timings}}'), {
        params: {
            timings: `${FuseAnimationDurations.entering} ${FuseAnimationCurves.deceleration}`,
        },
    }),
]);

export { expandCollapse };