$-mui-queue: (); /// Pauses the animation on an element by default, and then plays it when an active class is added to a parent. Also sets the fill mode of the animation to `both`. This pauses the element at the first frame of the animation, and holds it in place at the end. /// @access private %animated-element { animation-play-state: paused; animation-fill-mode: both; .#{map-get($motion-ui-settings, activate-queue-class)} & { animation-play-state: running; } } /// Creates a new animation queue. /// @param {Duration} $delay [0s] - Delay in seconds or milliseconds to place at the front of the animation queue. @mixin mui-series($delay: 0s) { $-mui-queue: () !global; @if $delay > 0 { $item: ($delay, 0s); $-mui-queue: append($-mui-queue, $item) !global; } @content; } /// Adds an animation to an animation queue. Only use this mixin inside of `mui-series()`. /// @param {Duration} $duration [1s] - Length of the animation. /// @param {Duration} $gap [0s] - Amount of time to pause before playing the animation after this one. Use a negative value to make the next effect overlap with the current one. /// @param {Function} $keyframes... - One or more effect functions to build the keyframe with. @mixin mui-queue( $duration: 1s, $gap: 0s, $keyframes... ) { // Build the animation $kf: -mui-process-args($keyframes...); // Calculate the delay for this animation based on how long the previous ones take $actual-delay: 0s; @each $anim in $-mui-queue { $actual-delay: $actual-delay + nth($anim, 1) + nth($anim, 2); } // Append this animation's length and gap to the end of the queue $item: ($duration, $gap); $-mui-queue: append($-mui-queue, $item) !global; // CSS output @extend %animated-element; @include mui-animation($kf); animation-duration: $duration; animation-delay: $actual-delay; }