Move voice message components to audio-generic directory

res/css/views/audio_messages/_PlayPauseButton.scss

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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_PlayPauseButton {
+    position: relative;
+    width: 32px;
+    height: 32px;
+    border-radius: 32px;
+    background-color: $voice-playback-button-bg-color;
+
+    &::before {
+        content: '';
+        position: absolute; // sizing varies by icon
+        background-color: $voice-playback-button-fg-color;
+        mask-repeat: no-repeat;
+        mask-size: contain;
+    }
+
+    &.mx_PlayPauseButton_disabled::before {
+        opacity: 0.5;
+    }
+
+    &.mx_PlayPauseButton_play::before {
+        width: 13px;
+        height: 16px;
+        top: 8px; // center
+        left: 12px; // center
+        mask-image: url('$(res)/img/element-icons/play.svg');
+    }
+
+    &.mx_PlayPauseButton_pause::before {
+        width: 10px;
+        height: 12px;
+        top: 10px; // center
+        left: 11px; // center
+        mask-image: url('$(res)/img/element-icons/pause.svg');
+    }
+}

res/css/views/audio_messages/_PlaybackContainer.scss

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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.
+*/
+
+// Dev note: there's no actual component called <PlaybackContainer />. These classes
+// are shared amongst multiple voice message components.
+
+// Container for live recording and playback controls
+.mx_VoiceMessagePrimaryContainer {
+    // 7px top and bottom for visual design. 12px left & right, but the waveform (right)
+    // has a 1px padding on it that we want to account for.
+    padding: 7px 12px 7px 11px;
+    background-color: $voice-record-waveform-bg-color;
+    border-radius: 12px;
+
+    // Cheat at alignment a bit
+    display: flex;
+    align-items: center;
+
+    color: $voice-record-waveform-fg-color;
+    font-size: $font-14px;
+    line-height: $font-24px;
+
+    .mx_Waveform {
+        .mx_Waveform_bar {
+            background-color: $voice-record-waveform-incomplete-fg-color;
+
+            &.mx_Waveform_bar_100pct {
+                // Small animation to remove the mechanical feel of progress
+                transition: background-color 250ms ease;
+                background-color: $voice-record-waveform-fg-color;
+            }
+        }
+    }
+
+    .mx_Clock {
+        width: $font-42px; // we're not using a monospace font, so fake it
+        padding-right: 6px; // with the fixed width this ends up as a visual 8px most of the time, as intended.
+        padding-left: 8px; // isolate from recording circle / play control
+    }
+}

res/css/views/audio_messages/_Waveform.scss

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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
+    }
+}