element-web/res/css/views/audio_messages/_SeekBar.pcss

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/*
Copyright 2024 New Vector Ltd.
Copyright 2021 The Matrix.org Foundation C.I.C.
SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/
/* CSS inspiration from: */
/* * https://www.w3schools.com/howto/howto_js_rangeslider.asp */
/* * https://stackoverflow.com/a/28283806 */
/* * https://css-tricks.com/styling-cross-browser-compatible-range-inputs-css/ */
.mx_SeekBar {
/* default, overridden in JS */
--fillTo: 1;
/* Dev note: we deliberately do not have the -ms-track (and friends) selectors because we don't */
/* need to support IE. */
appearance: none; /* default style override */
width: 100%;
height: 1px;
background: $quaternary-content;
outline: none; /* remove blue selection border */
position: relative; /* for before+after pseudo elements later on */
cursor: pointer;
&::-webkit-slider-thumb {
appearance: none; /* default style override */
/* Dev note: This needs to be duplicated with the -moz-range-thumb selector */
/* because otherwise Edge (webkit) will fail to see the styles and just refuse */
/* to apply them. */
width: 8px;
height: 8px;
border-radius: 8px;
background-color: $tertiary-content;
cursor: pointer;
}
&::-moz-range-thumb {
width: 8px;
height: 8px;
border-radius: 8px;
background-color: $tertiary-content;
cursor: pointer;
/* Firefox adds a border on the thumb */
border: none;
}
/* This is for webkit support, but we can't limit the functionality of it to just webkit */
/* browsers. Firefox responds to webkit-prefixed values now, which means we can't use media */
/* or support queries to selectively apply the rule. An upside is that this CSS doesn't work */
/* in firefox, so it's just wasted CPU/GPU time. */
&::before {
/* ::before to ensure it ends up under the thumb */
content: "";
background-color: $tertiary-content;
/* Absolute positioning to ensure it overlaps with the existing bar */
position: absolute;
top: 0;
left: 0;
/* Sizing to match the bar */
width: 100%;
height: 1px;
/* And finally dynamic width without overly hurting the rendering engine. */
transform-origin: 0 100%;
transform: scaleX(var(--fillTo));
}
/* This is firefox's built-in support for the above, with 100% less hacks. */
&::-moz-range-progress {
background-color: $tertiary-content;
height: 1px;
}
&:disabled {
opacity: 0.5;
}
/* Increase clickable area for the slider (approximately same size as browser default) */
/* We do it this way to keep the same padding and margins of the element, avoiding margin math. */
/* Source: https://front-back.com/expand-clickable-areas-for-a-better-touch-experience/ */
&::after {
content: "";
position: absolute;
top: -6px;
bottom: -6px;
left: 0;
right: 0;
}
}