source: trip-planner-front/node_modules/@angular/material/esm2015/expansion/expansion-animations.js

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1/**
2 * @license
3 * Copyright Google LLC All Rights Reserved.
4 *
5 * Use of this source code is governed by an MIT-style license that can be
6 * found in the LICENSE file at https://angular.io/license
7 */
8import { animate, state, style, transition, trigger, } from '@angular/animations';
9/** Time and timing curve for expansion panel animations. */
10// Note: Keep this in sync with the Sass variable for the panel header animation.
11export const EXPANSION_PANEL_ANIMATION_TIMING = '225ms cubic-bezier(0.4,0.0,0.2,1)';
12/**
13 * Animations used by the Material expansion panel.
14 *
15 * A bug in angular animation's `state` when ViewContainers are moved using ViewContainerRef.move()
16 * causes the animation state of moved components to become `void` upon exit, and not update again
17 * upon reentry into the DOM. This can lead a to situation for the expansion panel where the state
18 * of the panel is `expanded` or `collapsed` but the animation state is `void`.
19 *
20 * To correctly handle animating to the next state, we animate between `void` and `collapsed` which
21 * are defined to have the same styles. Since angular animates from the current styles to the
22 * destination state's style definition, in situations where we are moving from `void`'s styles to
23 * `collapsed` this acts a noop since no style values change.
24 *
25 * In the case where angular's animation state is out of sync with the expansion panel's state, the
26 * expansion panel being `expanded` and angular animations being `void`, the animation from the
27 * `expanded`'s effective styles (though in a `void` animation state) to the collapsed state will
28 * occur as expected.
29 *
30 * Angular Bug: https://github.com/angular/angular/issues/18847
31 *
32 * @docs-private
33 */
34export const matExpansionAnimations = {
35 /** Animation that rotates the indicator arrow. */
36 indicatorRotate: trigger('indicatorRotate', [
37 state('collapsed, void', style({ transform: 'rotate(0deg)' })),
38 state('expanded', style({ transform: 'rotate(180deg)' })),
39 transition('expanded <=> collapsed, void => collapsed', animate(EXPANSION_PANEL_ANIMATION_TIMING)),
40 ]),
41 /** Animation that expands and collapses the panel content. */
42 bodyExpansion: trigger('bodyExpansion', [
43 state('collapsed, void', style({ height: '0px', visibility: 'hidden' })),
44 state('expanded', style({ height: '*', visibility: 'visible' })),
45 transition('expanded <=> collapsed, void => collapsed', animate(EXPANSION_PANEL_ANIMATION_TIMING)),
46 ])
47};
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