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fix(material-experimental/mdc-list): add high contrast mode treatment #21376

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Apr 2, 2021
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fix(material-experimental/mdc-list): add high contrast mode treatment #21376

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33 changes: 33 additions & 0 deletions src/material-experimental/mdc-list/list.scss
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
@use '@material/list' as mdc-list;
@use '../mdc-helpers/mdc-helpers';
@use '../../material/core/style/layout-common';
@use '../../cdk/a11y/a11y';

@include mdc-list.deprecated-without-ripple($query: mdc-helpers.$mat-base-styles-query);

Expand Down Expand Up @@ -124,3 +125,35 @@
@include layout-common.fill();
pointer-events: none;
}


@include a11y.high-contrast(active, off) {
.mat-mdc-list-option,
.mat-mdc-nav-list .mat-mdc-list-item,
.mat-mdc-action-list .mat-mdc-list-item {
&:hover, &:focus {
outline: dotted 1px;
}
}

// In single selection mode, the selected option is indicated by changing its
// background color, but that doesn't work in high contrast mode. We add an
// alternate indication by rendering out a circle.
.mat-mdc-list-option.mdc-list-item--selected::after {
$size: 10px;
content: '';
position: absolute;
top: 50%;
right: mdc-list.$deprecated-side-padding;
transform: translateY(-50%);
width: $size;
height: 0;
border-bottom: solid $size;
border-radius: $size;
}

[dir='rtl'] .mat-mdc-list-option.mdc-list-item--selected::after {
right: auto;
left: mdc-list.$deprecated-side-padding;
}
}