104 lines
3.3 KiB
SCSS
104 lines
3.3 KiB
SCSS
/*
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Copyright 2021 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// CSS inspiration from:
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// * https://www.w3schools.com/howto/howto_js_rangeslider.asp
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// * https://stackoverflow.com/a/28283806
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// * https://css-tricks.com/styling-cross-browser-compatible-range-inputs-css/
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.mx_SeekBar {
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// Dev note: we deliberately do not have the -ms-track (and friends) selectors because we don't
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// need to support IE.
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appearance: none; // default style override
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width: 100%;
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height: 1px;
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background: $quaternary-content;
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outline: none; // remove blue selection border
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position: relative; // for before+after pseudo elements later on
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cursor: pointer;
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&::-webkit-slider-thumb {
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appearance: none; // default style override
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// Dev note: This needs to be duplicated with the -moz-range-thumb selector
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// because otherwise Edge (webkit) will fail to see the styles and just refuse
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// to apply them.
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width: 8px;
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height: 8px;
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border-radius: 8px;
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background-color: $tertiary-content;
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cursor: pointer;
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}
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&::-moz-range-thumb {
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width: 8px;
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height: 8px;
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border-radius: 8px;
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background-color: $tertiary-content;
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cursor: pointer;
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// Firefox adds a border on the thumb
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border: none;
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}
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// This is for webkit support, but we can't limit the functionality of it to just webkit
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// browsers. Firefox responds to webkit-prefixed values now, which means we can't use media
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// or support queries to selectively apply the rule. An upside is that this CSS doesn't work
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// in firefox, so it's just wasted CPU/GPU time.
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&::before { // ::before to ensure it ends up under the thumb
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content: '';
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background-color: $tertiary-content;
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// Absolute positioning to ensure it overlaps with the existing bar
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position: absolute;
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top: 0;
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left: 0;
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// Sizing to match the bar
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width: 100%;
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height: 1px;
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// And finally dynamic width without overly hurting the rendering engine.
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transform-origin: 0 100%;
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transform: scaleX(var(--fillTo));
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}
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// This is firefox's built-in support for the above, with 100% less hacks.
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&::-moz-range-progress {
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background-color: $tertiary-content;
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height: 1px;
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}
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&:disabled {
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opacity: 0.5;
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}
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// Increase clickable area for the slider (approximately same size as browser default)
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// We do it this way to keep the same padding and margins of the element, avoiding margin math.
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// Source: https://front-back.com/expand-clickable-areas-for-a-better-touch-experience/
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&::after {
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content: '';
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position: absolute;
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top: -6px;
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bottom: -6px;
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left: 0;
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right: 0;
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}
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}
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