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

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/*
Copyright 2021 The Matrix.org Foundation C.I.C.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
.mx_Waveform {
position: relative;
height: 30px; /* tallest bar can only be 30px */
top: 1px; /* because of our border trick (see below), we're off by 1px of aligntment */
display: flex;
align-items: center; /* so the bars grow from the middle */
overflow: hidden; /* this is cheaper than a `max-height: calc(100% - 4px)` in the bar's CSS. */
/* A bar is meant to be a 2x2 circle when at zero height, and otherwise a 2px wide line */
/* with rounded caps. */
.mx_Waveform_bar {
width: 0; /* 0px width means we'll end up using the border as our width */
border: 1px solid transparent; /* transparent means we'll use the background colour */
border-radius: 2px; /* rounded end caps, based on the border */
min-height: 0; /* like the width, we'll rely on the border to give us height */
max-height: 100%; /* this makes the `height: 42%` work on the element */
margin-left: 1px; /* we want 2px between each bar, so 1px on either side for balance */
margin-right: 1px;
/* background color is handled by the parent components */
}
}