1 | // Copyright 2020 Google Inc.
|
2 | //
|
3 | // Permission is hereby granted, free of charge, to any person obtaining a copy
|
4 | // of this software and associated documentation files (the "Software"), to deal
|
5 | // in the Software without restriction, including without limitation the rights
|
6 | // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
7 | // copies of the Software, and to permit persons to whom the Software is
|
8 | // furnished to do so, subject to the following conditions:
|
9 | //
|
10 | // The above copyright notice and this permission notice shall be included in
|
11 | // all copies or substantial portions of the Software.
|
12 | //
|
13 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
14 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
15 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
16 | // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
17 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
18 | // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
19 | // THE SOFTWARE.
|
20 |
|
21 | @use '@material/feature-targeting/feature-targeting';
|
22 | ///
|
23 | /// Emits necessary layout styles to set a transparent border around an element
|
24 | /// without interfering with the rest of its component layout. The border is
|
25 | /// only visible in high-contrast mode. The target element should be a child of
|
26 | /// a relatively positioned top-level element (i.e. a ::before pseudo-element).
|
27 | ///
|
28 | /// @param {number} $border-width - The width of the transparent border.
|
29 | /// @param {string} $border-style - The style of the transparent border.
|
30 | ///
|
31 | @mixin transparent-border(
|
32 | $border-width: 1px,
|
33 | $border-style: solid,
|
34 | $query: feature-targeting.all()
|
35 | ) {
|
36 | $feat-structure: feature-targeting.create-target($query, structure);
|
37 |
|
38 | @include feature-targeting.targets($feat-structure) {
|
39 | position: absolute;
|
40 | box-sizing: border-box;
|
41 | width: 100%;
|
42 | height: 100%;
|
43 | top: 0;
|
44 | left: 0;
|
45 | border: $border-width $border-style transparent;
|
46 | border-radius: inherit;
|
47 | content: '';
|
48 | pointer-events: none;
|
49 | }
|
50 | }
|
51 |
|
52 | ///
|
53 | /// Visually hides text content for accessibility. This text should only be
|
54 | /// visible to screen reader users.
|
55 | /// See https://a11yproject.com/posts/how-to-hide-content/
|
56 | ///
|
57 | @mixin visually-hidden($query: feature-targeting.all()) {
|
58 | $feat-structure: feature-targeting.create-target($query, structure);
|
59 |
|
60 | @include feature-targeting.targets($feat-structure) {
|
61 | clip: rect(1px, 1px, 1px, 1px);
|
62 | height: 1px;
|
63 | overflow: hidden;
|
64 | position: absolute;
|
65 | white-space: nowrap; /* added line */
|
66 | width: 1px;
|
67 | }
|
68 | }
|
69 |
|
70 | ///
|
71 | /// Selects for high-contrast mode. Currently this only detects high-contrast
|
72 | /// mode in IE and Edge.
|
73 | ///
|
74 | @mixin ie-high-contrast-mode {
|
75 | @media screen and (-ms-high-contrast: active) {
|
76 | @content;
|
77 | }
|
78 | }
|