| /** |
| * @license |
| * Copyright Google LLC All Rights Reserved. |
| * |
| * Use of this source code is governed by an MIT-style license that can be |
| * found in the LICENSE file at https://angular.io/license |
| */ |
| import { animate, state, style, transition, trigger, } from '@angular/animations'; |
| /** Time and timing curve for expansion panel animations. */ |
| // Note: Keep this in sync with the Sass variable for the panel header animation. |
| export const EXPANSION_PANEL_ANIMATION_TIMING = '225ms cubic-bezier(0.4,0.0,0.2,1)'; |
| /** |
| * Animations used by the Material expansion panel. |
| * |
| * A bug in angular animation's `state` when ViewContainers are moved using ViewContainerRef.move() |
| * causes the animation state of moved components to become `void` upon exit, and not update again |
| * upon reentry into the DOM. This can lead a to situation for the expansion panel where the state |
| * of the panel is `expanded` or `collapsed` but the animation state is `void`. |
| * |
| * To correctly handle animating to the next state, we animate between `void` and `collapsed` which |
| * are defined to have the same styles. Since angular animates from the current styles to the |
| * destination state's style definition, in situations where we are moving from `void`'s styles to |
| * `collapsed` this acts a noop since no style values change. |
| * |
| * In the case where angular's animation state is out of sync with the expansion panel's state, the |
| * expansion panel being `expanded` and angular animations being `void`, the animation from the |
| * `expanded`'s effective styles (though in a `void` animation state) to the collapsed state will |
| * occur as expected. |
| * |
| * Angular Bug: https://github.com/angular/angular/issues/18847 |
| * |
| * @docs-private |
| */ |
| export const matExpansionAnimations = { |
| /** Animation that rotates the indicator arrow. */ |
| indicatorRotate: trigger('indicatorRotate', [ |
| state('collapsed, void', style({ transform: 'rotate(0deg)' })), |
| state('expanded', style({ transform: 'rotate(180deg)' })), |
| transition('expanded <=> collapsed, void => collapsed', animate(EXPANSION_PANEL_ANIMATION_TIMING)), |
| ]), |
| /** Animation that expands and collapses the panel content. */ |
| bodyExpansion: trigger('bodyExpansion', [ |
| state('collapsed, void', style({ height: '0px', visibility: 'hidden' })), |
| state('expanded', style({ height: '*', visibility: 'visible' })), |
| transition('expanded <=> collapsed, void => collapsed', animate(EXPANSION_PANEL_ANIMATION_TIMING)), |
| ]) |
| }; |
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