整理した

src/client/app/common/views/components/stream-indicator.vue

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+<template>
+<div class="mk-stream-indicator">
+	<p v-if=" stream.state == 'initializing' ">
+		%fa:spinner .pulse%
+		<span>%i18n:common.tags.mk-stream-indicator.connecting%<mk-ellipsis/></span>
+	</p>
+	<p v-if=" stream.state == 'reconnecting' ">
+		%fa:spinner .pulse%
+		<span>%i18n:common.tags.mk-stream-indicator.reconnecting%<mk-ellipsis/></span>
+	</p>
+	<p v-if=" stream.state == 'connected' ">
+		%fa:check%
+		<span>%i18n:common.tags.mk-stream-indicator.connected%</span>
+	</p>
+</div>
+</template>
+
+<script lang="ts">
+import Vue from 'vue';
+import * as anime from 'animejs';
+
+export default Vue.extend({
+	computed: {
+		stream() {
+			return (this as any).os.stream;
+		}
+	},
+	created() {
+		(this as any).os.stream.on('_connected_', this.onConnected);
+		(this as any).os.stream.on('_disconnected_', this.onDisconnected);
+
+		this.$nextTick(() => {
+			if (this.stream.state == 'connected') {
+				this.$el.style.opacity = '0';
+			}
+		});
+	},
+	beforeDestroy() {
+		(this as any).os.stream.off('_connected_', this.onConnected);
+		(this as any).os.stream.off('_disconnected_', this.onDisconnected);
+	},
+	methods: {
+		onConnected() {
+			setTimeout(() => {
+				anime({
+					targets: this.$el,
+					opacity: 0,
+					easing: 'linear',
+					duration: 200
+				});
+			}, 1000);
+		},
+		onDisconnected() {
+			anime({
+				targets: this.$el,
+				opacity: 1,
+				easing: 'linear',
+				duration: 100
+			});
+		}
+	}
+});
+</script>
+
+<style lang="stylus" scoped>
+.mk-stream-indicator
+	pointer-events none
+	position fixed
+	z-index 16384
+	bottom 8px
+	right 8px
+	margin 0
+	padding 6px 12px
+	font-size 0.9em
+	color #fff
+	background rgba(0, 0, 0, 0.8)
+	border-radius 4px
+
+	> p
+		display block
+		margin 0
+
+		> [data-fa]
+			margin-right 0.25em
+
+</style>