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1 | @use '../../../cdk/a11y';
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2 |
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3 | @mixin ripple() {
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4 | // The host element of an mat-ripple directive should always have a position of "absolute" or
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5 | // "relative" so that the ripples inside are correctly positioned relatively to the container.
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6 | .mat-ripple {
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7 | overflow: hidden;
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8 |
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9 | // By default, every ripple container should have position: relative in favor of creating an
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10 | // easy API for developers using the MatRipple directive.
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11 | position: relative;
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12 |
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13 | // Promote containers that have ripples to a new layer. We want to target `:not(:empty)`,
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14 | // because we don't want all ripple containers to have their own layer since they're used in a
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15 | // lot of places and the layer is only relevant while animating. Note that ideally we'd use
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16 | // the `contain` property here (see #13175), because `:empty` can be broken by having extra
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17 | // text inside the element, but it isn't very well supported yet.
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18 | &:not(:empty) {
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19 | transform: translateZ(0);
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20 | }
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21 | }
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22 |
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23 | .mat-ripple.mat-ripple-unbounded {
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24 | overflow: visible;
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25 | }
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26 |
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27 | .mat-ripple-element {
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28 | position: absolute;
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29 | border-radius: 50%;
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30 | pointer-events: none;
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31 |
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32 | transition: opacity, transform 0ms cubic-bezier(0, 0, 0.2, 1);
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33 | transform: scale(0);
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34 |
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35 | // In high contrast mode the ripple is opaque, causing it to obstruct the content.
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36 | @include a11y.high-contrast(active, off) {
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37 | display: none;
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38 | }
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39 | }
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40 | }
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