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src/components/opacity_input/opacity_input.vue

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+<template>
+<div class="opacity-control" :class="{ disabled: !present }">
+  <label :for="name" class="label">
+    {{$t('settings.opacity')}}
+  </label>
+  <input
+  v-if="typeof fallback !== 'undefined'"
+  class="opt"
+  :id="name + '-o'"
+      type="checkbox"
+  :checked="present"
+           @input="$emit('input', !present ? fallback : undefined)"
+           >
+  <label v-if="typeof fallback !== 'undefined'" class="opt-l" :for="name + '-o'"></label>
+  <input
+    :id="name"
+    class="input-range"
+    type="range"
+    :value="value || fallback"
+    :disabled="!present"
+    @input="$emit('input', $event.target.value)"
+    max="1"
+    min="0"
+    step=".05">
+</div>
+</template>
+
+<script>
+export default {
+  props: [
+    'name', 'value', 'fallback'
+  ],
+  computed: {
+    present () {
+      return typeof this.value !== 'undefined'
+    }
+  }
+}
+</script>
+
+<style lang="scss">
+.opacity-control {
+  display: flex;
+
+  &.disabled *:not(.opt-l) {
+    opacity: .5
+  }
+
+  .opt-l {
+    align-self: center;
+    line-height: 0;
+    &::before {
+      width: 14px;
+      height: 14px;
+    }
+  }
+
+  .label {
+    flex: 2;
+    min-width: 7em;
+  }
+
+  .input-range {
+    align-self: center;
+    background: none;
+    border: none;
+    padding: 0;
+    margin: 0;
+    height: auto;
+    box-shadow: none;
+    min-width: 9em;
+    flex: 1;
+  }
+}
+</style>